efl/legacy/elementary/doc/examples.dox

/**
 * @page Examples Examples
 *
 * Here is a list of all Elementary examples.
 *
 * @ref bg_01_example_page
 *
 * @ref bg_02_example_page
 *
 * @ref bg_03_example_page
 *
 * @ref actionslider_example_page
 *
 * @ref transit_example_01_explained
 *
 * @ref transit_example_02_explained
 *
 * @ref general_functions_example_page
 *
 * @ref calendar_example_01
 *
 * @ref calendar_example_02
 *
 * @ref calendar_example_03
 *
 * @ref calendar_example_04
 *
 * @ref calendar_example_05
 *
 * @ref calendar_example_06
 *
 * @ref spinner_example
 *
 * @ref slider_example
 *
 * @ref panes_example
 *
 * @ref clock_example
 *
 * @ref datetime_example
 *
 * @ref dayselector_example
 *
 * @ref mapbuf_example
 *
 * @ref map_example_01
 *
 * @ref map_example_02
 *
 * @ref map_example_03
 *
 * @ref diskselector_example_01
 *
 * @ref diskselector_example_02
 *
 * @ref entry_example
 *
 * @ref list_example_01
 *
 * @ref list_example_02
 *
 * @ref list_example_03
 *
 * @ref toolbar_example_01
 *
 * @ref toolbar_example_02
 *
 * @ref toolbar_example_03
 *
 * @ref segment_control_example
 *
 * @ref flipselector_example
 *
 * @ref fileselector_example
 *
 * @ref fileselector_button_example
 *
 * @ref fileselector_entry_example
 *
 * @ref index_example_01
 *
 * @ref index_example_02
 *
 * @ref gengrid_example
 *
 * @ref genlist_example_01
 *
 * @ref genlist_example_02
 *
 * @ref genlist_example_03
 *
 * @ref genlist_example_04
 *
 * @ref genlist_example_05
 *
 * @ref glview_example_01_page
 *
 * @ref thumb_example_01
 *
 * @ref progressbar_example
 *
 * @ref slideshow_example
 *
 * @ref efl_thread_1
 *
 * @ref efl_thread_2
 *
 * @ref efl_thread_3
 *
 * @ref efl_thread_4
 *
 * @ref efl_thread_5
 *
 * @ref efl_thread_6
 *
 * @ref prefs_example_01
 *
 * @ref prefs_example_02
 *
 * @ref prefs_example_03
 */

/**
 * @page bg_01_example_page elm_bg - Plain color background.
 * @dontinclude bg_example_01.c
 *
 * The full code for this example can be found at @ref bg_example_01_c,
 * in the function @c test_bg_plain. It's part of the @c elementary_test
 * suite, and thus has the code for the three examples referenced by this
 * documentation.
 *
 * This first example just sets a default background with a plain color. The
 * first part consists of creating an Elementary window. It's the common
 * piece of code that you'll see everywhere in Elementary: @skip elm_main
 * @until autodel_set
 *
 * Now we really create our background object, using the window object as
 * its parent:
 *
 * @skipline bg_add
 *
 * Then we set the size hints of the background object so that it will use
 * all space available for it, and then add it as a resize object to the
 * window, making it visible in the end:
 *
 * @skip size_hint_weight_set
 * @until resize_object_add
 *
 * See evas_object_size_hint_weight_set() and elm_win_resize_object_add()
 * for more detailed info about these functions.
 *
 * The end of the example is quite simple, just setting the minimum and
 * maximum size of the background, so the Elementary window knows that it
 * has to have at least the minimum size. The background also won't scale to
 * a size above its maximum. Then we resize the window and show it in the
 * end:
 *
 * @skip set size hints
 * @until }
 *
 * And here we finish our very simple background object usage example.
 */

/**
 * @page bg_02_example_page elm_bg - Image background.
 * @dontinclude bg_example_02.c
 *
 * The full code for this example can be found at @ref bg_example_02_c,
 * in the function @c test_bg_image. It's part of the @c elementary_test
 * suite, and thus has the code for the three examples referenced by this
 * documentation.
 *
 * This is the second example, and shows how to use the Elementary
 * background object to set an image as background of your application.
 *
 * We start this example exactly in the same way as the previous one, even
 * when creating the background object:
 *
 * @skip elm_main
 * @until bg_add
 *
 * Now it's the different part.
 *
 * Our background will have an image, that will be displayed over the
 * background color. Before loading the image, we set the load size of the
 * image. The load size is a hint about the size that we want the image
 * displayed in the screen. It's not the exact size that the image will have,
 * but usually a bit bigger. The background object can still be scaled to a
 * size bigger than the one set here. Setting the image load size to
 * something smaller than its real size will reduce the memory used to keep
 * the pixmap representation of the image, and the time to load it. Here we
 * set the load size to 20x20 pixels, but the image is loaded with a size
 * bigger than that (since it's just a hint):
 *
 * @skipline load_size_set
 *
 * And set our background image to be centered, instead of stretched or
 * scaled, so the effect of the elm_bg_load_size_set() can be easily
 * understood:
 *
 * @skipline option_set
 *
 * We need a filename to set, so we get one from the previous installed
 * images in the @c PACKAGE_DATA_DIR, and write its full path to a buffer.
 * Then we use this buffer to set the filename in the background object:
 *
 * @skip snprintf
 * @until bg_file_set
 *
 * Notice that the third argument of the elm_bg_file_set() function is @c
 * NULL, since we are setting an image to this background. This function
 * also supports setting an edje group as background, in which case the @c
 * group parameter wouldn't be @c NULL, but be the name of the group
 * instead.
 *
 * Finally, we can set the size hints, add the background as a resize
 * object, and resize the window, exactly the same thing we do in the @ref
 * bg_01_example_page example:
 *
 * @skip size_hint
 * @until }
 *
 * And this is the end of this example.
 *
 * This example will look like this:
 *
 * @image html screenshots/bg_01.png
 * @image latex screenshots/bg_01.eps width=\textwidth
 */

/**
 * @page bg_03_example_page elm_bg - Background properties.
 * @dontinclude bg_example_03.c
 *
 * The full code for this example can be found at @ref bg_example_03_c, in the
 * function @c test_bg_options, with the callbacks @c _cb_overlay_changed, @c
 * _cb_color_changed and @c _cb_radio_changed defined in the beginning of the
 * file. It's part of the @c elementary_test suite, and thus has the code for
 * the three examples referenced by this documentation.
 *
 * This example will show the properties available for the background object,
 * and will use of some more widgets to set them.
 *
 * In order to do this, we will set some callbacks for these widgets. The
 * first is for the radio buttons that will be used to choose the option
 * passed as argument to elm_bg_option_set():
 *
 * @skip _cb_radio_changed
 * @until }
 *
 * The next callback will be used when setting the overlay (using
 * elm_object_content_set()):
 *
 * @skip _cb_overlay_changed
 * @until }
 * @until }
 *
 * And the last one, used to set the color (with elm_bg_color_set()):
 *
 * @skip _cb_color_changed
 * @until }
 *
 * We will get back to what these functions do soon. If you want to know more
 * about how to set these callbacks and what these widgets are, look for:
 * @li elm_radio_add()
 * @li elm_check_add()
 * @li elm_spinner_add()
 *
 * Now going to the main function, @c test_bg_options, we have the common
 * code with the other examples:
 *
 * @skip bg-options
 * @until autodel_set
 *
 * We add a plain background to this window, so it will have the default
 * background color behind everything:
 *
 * @skip bg = elm_bg_add
 * @until evas_object_show(bg)
 *
 * Then we add a vertical box (elm_box_add()) that will hold the background
 * object that we are going to play with, as well as a horizontal box that
 * will hold widgets:
 *
 * @skip elm_box_add
 * @until evas_object_show
 *
 * Now we add the background object that is going to be of use for our
 * example. It is an image background, as used in @ref bg_02_example_page ,
 * so the code should be familiar:
 *
 * @skip elm_bg_add
 * @until evas_object_show
 *
 * Notice the call to elm_box_pack_end(): it will pack the background object
 * in the end of the Elementary box declared above. Just refer to that
 * documentation for more info.
 *
 * Since this Elementary background is already an image background, we are
 * going to play with its other properties. We will change its option
 * (CENTER, SCALE, STRETCH, TILE), its color (RGB), and add an overlay to it.
 * For all of these properties, we are going to add widgets that will
 * configure them.
 *
 * First, lets add the horizontal box that will hold these widgets:
 * @skip hbox
 * @until align_set
 *
 * For now, just consider this @c hbox as a rectangle that will contain the
 * widgets, and will distribute them horizontally inside its content. Then we
 * add radio buttons that will allow us to choose the property to use with
 * this background:
 *
 * @skip radio_add
 * @until evas_object_show
 *
 * Again, I won't give details about the use of these widgets, just look for
 * their documentation if necessary. It's enough to know for now that we are
 * packing them in the @c hbox, setting a label for them, and the most
 * important parts: setting its value to @c ELM_BG_OPTION_CENTER and its
 * callback to @c _cb_radio_changed (the function defined in the beginning of
 * this example). We do this for the next 3 radio buttons added after this
 * one, each of them with a different value.
 *
 * Now taking a look at the code of the callback @c _cb_radio_changed again,
 * it will call elm_bg_option_set() with the value set from the checked radio
 * button, thus setting the option for this background. The background is
 * passed as argument to the @p data parameter of this callback, and is
 * referenced here as @c o_bg.
 *
 * Later we set the default value for this radio button:
 *
 * @skipline elm_radio_value_set
 *
 * Then we add a checkbox for the elm_object_content_set() function for the bg:
 *
 * @skip check_add
 * @until evas_object_show
 *
 * Now look at the code of the @c _cb_overlay_changed again. If the checkbox
 * state is checked, an overlay will be added to the background. It's done by
 * creating an Edje object, and setting it with elm_object_content_set() to the
 * background object. For information about what are and how to set Edje
 * object, look at the Edje documentation.
 *
 * Finally we add a spinner object (elm_spinner_add()) to be used to select
 * the color of our background. In its callback it's possible to see the call
 * to elm_bg_color_set(), which will change the color of this background.
 * This color is used by the background to fill areas where the image doesn't
 * cover (in this case, where we have an image background). The spinner is
 * also packed into the @c hbox :
 *
 * @skip elm_spinner_add
 * @until evas_object_show
 *
 * Then we just have to pack the @c hbox inside the @c box, set some size
 * hints, and show our window:
 *
 * @skip pack_end
 * @until }
 *
 * Now to see this code in action, open elementary_test, and go to the "Bg
 * Options" test. It should demonstrate what was implemented here.
 */

/**
 * @page actionslider_example_page Actionslider usage
 * @dontinclude actionslider_example_01.c
 *
 * For this example we are going to assume knowledge of evas smart callbacks
 * and some basic evas object functions. Elementary is not meant to be used
 * without evas, if you're not yet familiar with evas it probably is worth
 * checking that out.
 *
 * And now to the example, when using Elementary we start by including
 * Elementary.h:
 * @skipline #include
 *
 * Next we define some callbacks, they all share the same signature because
 * they are all to be used with evas_object_smart_callback_add().
 * The first one just prints the selected label(in two different ways):
 * @until }
 *
 * This next callback is a little more interesting, it makes the selected
 * label magnetic(except if it's the center label):
 * @until }
 *
 * This callback enables or disables the magnetic property of the center
 * label:
 * @until }
 *
 * And finally a callback to stop the main loop when the window is closed:
 * @until }
 *
 * To be able to create our actionsliders we need to do some setup, but this
 * isn't really relevant here, so if you want to know about that go @ref
 * Win "here".
 *
 * With all that boring stuff out of the way we can proceed to creating some
 * actionsliders.@n
 * All actionsliders are created the same way:
 * @skipline actionslider_add
 * Next we must choose where the indicator starts, and for this one we choose
 * the right, and set the right as magnetic:
 * @skipline indicator_pos_set
 * @until magnet_pos_set
 *
 * We then set the labels for the left and right, passing NULL as an argument
 * to any of the labels makes that position have no label.
 * @until Stop
 *
 * Furthermore we mark both left and right as enabled positions, if we didn't
 * do this all three positions would be enabled:
 * @until RIGHT
 *
 * Having the enabled positions we now add a smart callback to change
 * which position is magnetic, so that only the last selected position is
 * magnetic:
 * @until NULL
 *
 * And finally we set our printing callback and show the actionslider:
 * @until object_show
 * @skip pack_end
 *
 * For our next actionslider we are going to do much as we did for the
 * previous except we are going to have the center as the magnet(and not
 * change it):
 * @skipline actionslider_add
 * @skipline indicator_pos_set
 * @until object_show
 *
 * And another actionslider, in this one the indicator starts on the left.
 * It has labels only in the center and right, and both positions are
 * magnetic. Because the left doesn't have a label and is not magnetic once
 * the indicator leaves it can't return:
 * @skipline actionslider_add
 * @skipline indicator_pos_set
 * @until object_show
 * @note The greyed out area is a @ref Styles "style".
 *
 * And now an actionslider with a label in the indicator, and whose magnet
 * properties change based on what was last selected:
 * @skipline actionslider_add
 * @skipline indicator_pos_set
 * @until object_show
 * @note The greyed out area is a @ref Styles "style".
 *
 * We are almost done, this next one is just an actionslider with all
 * positions magnetized and having every possible label:
 * @skipline actionslider_add
 * @skipline indicator_pos_set
 * @until object_show
 *
 * And for our last actionslider we have one that turns the magnetic property
 * on and off:
 * @skipline actionslider_add
 * @skipline indicator_pos_set
 * @until object_show
 *
 * The example will look like this:
 *
 * @image html screenshots/actionslider_01.png
 * @image latex screenshots/actionslider_01.eps width=\textwidth
 *
 * See the full source code @ref actionslider_example_01 "here"
 */

/**
 * @page transit_example_03_c elm_transit - Combined effects and options.
 *
 * This example shows how to apply the following transition effects:
 * @li translation
 * @li color
 * @li rotation
 * @li wipe
 * @li zoom
 * @li resizing
 *
 * It allows you to apply more than one effect at once, and also allows to
 * set properties like event_enabled, auto_reverse, repeat_times and
 * tween_mode.
 *
 * @include transit_example_03.c
 * @example transit_example_03.c
 */

/**
 * @page transit_example_04_c elm_transit - Combined effects over two objects.
 *
 * This example shows how to apply the transition effects:
 * @li flip
 * @li resizable_flip
 * @li fade
 * @li blend
 * over two objects. This kind of transition effect is used to make one
 * object disappear and another one appear on its place.
 *
 * You can mix more than one effect of this type on the same objects, and the
 * transition will apply both.
 *
 * @include transit_example_04.c
 * @example transit_example_04.c
 */

/**
 * @page transit_example_01_explained elm_transit - Basic transit usage.
 * @dontinclude transit_example_01.c
 *
 * The full code for this example can be found at @ref transit_example_01_c.
 *
 * This example shows the simplest way of creating a transition and applying
 * it to an object. Similarly to every other elementary example, we create a
 * window, set its title, size, autodel property, and setup a callback to
 * exit the program when finished:
 *
 * @skip on_done
 * @until evas_object_resize
 *
 * We also add a resizable white background to use behind our animation:
 *
 * @skip bg_add
 * @until evas_object_show
 *
 * And then we add a button that we will use to demonstrate the effects of
 * our animation:
 *
 * @skip button_add
 * @until evas_object_show(win)
 *
 * Notice that we are not adding the button with elm_win_resize_object_add()
 * because we don't want the window to control the size of the button. We
 * will use the transition to change the button size, so it could conflict
 * with something else trying to control that size.
 *
 * Now, the simplest code possible to create the resize animation:
 *
 * @skip transit_add
 * @until transit_go
 *
 * As you can see, this code is very easy to understand. First, we create the
 * transition itself with elm_transit_add(). Then we add the button to this
 * transition with elm_transit_object_add(), which means that the transition
 * will operate over this button. The effect that we want now is changing the
 * object size from 100x50 to 300x150, and can be achieved by adding the
 * resize effect with elm_transit_effect_resizing_add().
 *
 * Finally, we set the transition time to 5 seconds and start the transition
 * with elm_transit_go(). If we wanted more effects applied to this
 * button, we could add them to the same transition. See the
 * @ref transit_example_03_c to watch many transitions being applied to an
 * object.
 */

/**
 * @page transit_example_02_explained elm_transit - Chained transitions.
 * @dontinclude transit_example_02.c
 *
 * The full code for this example can be found at @ref transit_example_02_c.
 *
 * This example shows how to implement a chain of transitions. This chain is
 * used to start a transition just after another transition ended. Similarly
 * to every other elementary example, we create a window, set its title,
 * size, autodel property, and setup a callback to exit the program when
 * finished:
 *
 * @skip on_done
 * @until evas_object_resize
 *
 * We also add a resizable white background to use behind our animation:
 *
 * @skip bg_add
 * @until evas_object_show
 *
 * This example will have a chain of 4 transitions, each of them applied to
 * one button. Thus we create 4 different buttons:
 *
 * @skip button_add
 * @until evas_object_show(bt4)
 *
 * Now we create a simple translation transition that will be started as soon
 * as the program loads. It will be our first transition, and the other
 * transitions will be started just after this transition ends:
 *
 * @skip transit_add
 * @until transit_go
 *
 * The code displayed until now has nothing different from what you have
 * already seen in @ref transit_example_01_explained, but now comes the new
 * part: instead of creating a second transition that will start later using
 * a timer, we create the it normally, and use
 * elm_transit_chain_transit_add() instead of elm_transit_go. Since we are
 * adding it in a chain after the first transition, it will start as soon as
 * the first transition ends:
 *
 * @skip transit_add
 * @until transit_chain_transit_add
 *
 * Finally we add the 2 other transitions to the chain, and run our program.
 * It will make one transition start after the other finish, and there is the
 * transition chain.
 */

/**
 * @page general_functions_example_page General (top-level) functions example
 * @dontinclude general_funcs_example.c
 *
 * As told in their documentation blocks, the
 * elm_app_compile_*_dir_set() family of functions have to be called
 * before elm_app_info_set():
 * @skip tell elm about
 * @until elm_app_info_set
 *
 * We are here setting the fallback paths to the compiling time target
 * paths, naturally. If you're building the example out of the
 * project's build system, we're assuming they are the canonical ones.
 *
 * After the program starts, elm_app_info_set() will actually run and
 * then you'll see an intrincasy: Elementary does the prefix lookup @b
 * twice. This is so because of the quicklaunch infrastructure in
 * Elementary (@ref Start), which will register a predefined prefix
 * for possible users of the launch schema. We're not hooking into a
 * quick launch, so this first call can't be avoided.
 *
 * If you ran this example from your "bindir" installation
 * directory, no output will emerge from these both attempts -- it
 * will find the "magic" file there registered and set the prefixes
 * silently. Otherwise, you could get something like:
 @verbatim
 WARNING: Could not determine its installed prefix for 'ELM'
       so am falling back on the compiled in default:
         usr
       implied by the following:
         bindir    = usr/lib
         libdir    = usr/lib
         datadir   = usr/share/elementary
         localedir = usr/share/locale
       Try setting the following environment variables:
         ELM_PREFIX     - points to the base prefix of install
       or the next 4 variables
         ELM_BIN_DIR    - provide a specific binary directory
         ELM_LIB_DIR    - provide a specific library directory
         ELM_DATA_DIR   - provide a specific data directory
         ELM_LOCALE_DIR - provide a specific locale directory
 @endverbatim
 * if you also didn't change those environment variables (remember
 * they are also a valid way of communicating your prefix to the
 * binary) - this is the scenario where it fallbacks to the paths set
 * for compile time.
 *
 * Then, you can check the prefixes set on the standard output:
 * @skip prefix was set to
 * @until locale directory is
 *
 * In the fragment
 * @skip by using this policy
 * @until elm_win_autodel_set
 * we demonstrate the use of Elementary policies. The policy defining
 * under which circumstances our application should quit automatically
 * is set to when its last window is closed (this one has just one
 * window, though). This will save us from having to set a callback
 * ourselves on the window, like done in @ref bg_example_01_c "this"
 * example. Note that we need to tell the window to delete itself's
 * object on a request to destroy the canvas coming, with
 * elm_win_autodel_set().
 *
 * What follows is some boilerplate code, creating a frame with a @b
 * button, our object of interest, and, below, widgets to change the
 * button's behavior and exemplify the group of functions in question.
 *
 * @dontinclude general_funcs_example.c
 * We enabled the focus highlight object for this window, so that you
 * can keep track of the current focused object better:
 * @skip elm_win_focus_highlight_enabled_set
 * @until evas_object_show
 * Use the tab key to navigate through the focus chain.
 *
 * @dontinclude general_funcs_example.c
 * While creating the button, we exemplify how to use Elementary's
 * finger size information to scale our UI:
 * @skip fprintf(stdout, "Elementary
 * @until evas_object_show
 *
 * @dontinclude general_funcs_example.c
 * The first checkbox's callback is:
 * @skip static void
 * @until }
 * When unsetting the checkbox, we disable the button, which will get a new
 * decoration (greyed out) and stop receiving events. The focus chain
 * will also ignore it.
 *
 * Following, there are 2 more buttons whose actions are focus/unfocus
 * the top button, respectively:
 * @skip focus callback
 * @until }
 * and
 * @skip unfocus callback
 * @until }
 * Note the situations in which they won't take effect:
 * - the button is not allowed to get focus or
 * - the button is disabled
 *
 * The first restriction above you'll get by a second checkbox, whose
 * callback is:
 * @skip focus allow callback
 * @until }
 * Note that the button will still get mouse events, though.
 *
 * Next, there's a slider controlling the button's scale:
 * @skip scaling callback
 * @until }
 *
 * Experiment with it, so you understand the effect better. If you
 * change its value, it will mess with the button's original size,
 * naturally.
 *
 * The full code for this example can be found
 * @ref general_functions_example_c "here".
 */

/**
 * @page theme_example_01 Theme - Using extensions
 *
 * @dontinclude theme_example_01.c
 *
 * Using extensions is extremely easy, discarding the part where you have to
 * write the theme for them.
 *
 * In the following example we'll be creating two buttons, one to load or
 * unload our extension theme and one to cycle around three possible styles,
 * one of which we created.
 *
 * After including our one and only header we'll jump to the callback for
 * the buttons. First one takes care of loading or unloading our extension
 * file, relative to the default theme set (thus the @c NULL in the
 * functions first parameter).
 * @skipline Elementary.h
 * @skip static void
 * @until }
 * @until }
 * @until }
 *
 * The second button, as we said before, will just switch around different
 * styles. In this case we have three of them. The first one is our custom
 * style, named after something very unlikely to find in the default theme.
 * The other two styles are the standard and one more, anchor, which exists
 * in the default and is similar to the default, except the button vanishes
 * when the mouse is not over it.
 * @skip static void
 * @until }
 * @until }
 *
 * So what happens if the style switches to our custom one when the
 * extension is loaded? Elementary falls back to the default for the
 * widget.
 *
 * And the main function, simply enough, will create the window, set the
 * buttons and their callbacks, and just to begin with our button styled
 * we're also loading our extension at the beginning.
 * @skip int
 * @until ELM_MAIN
 *
 * In this case we wanted to easily remove extensions, but all adding an
 * extension does is tell Elementary where else it should look for themes
 * when it can't find them in the default theme. Another way to do this
 * is to set the theme search order using elm_theme_set(), but this requires
 * that the developer is careful not to override any user configuration.
 * That can be helped by adding our theme to the end of whatever is already
 * set, like in the following snippet.
 * @code
 * char buf[4096];
 * snprintf(buf, sizeof(buf), "%s:./theme_example.edj", elme_theme_get(NULL);
 * elm_theme_set(NULL, buf);
 * @endcode
 *
 * If we were using overlays instead of extensions, the same thing applies,
 * but the custom theme must be added to the front of the search path.
 *
 * In the end, we should be looking at something like this:
 *
 * @image html screenshots/theme_example_01.png
 * @image latex screenshots/theme_example_01.eps width=\textwidth
 *
 * That's all. Boringly simple, and the full code in one piece can be found
 * @ref theme_example_01.c "here".
 *
 * And the code for our extension is @ref theme_example.edc "here".
 *
 * @example theme_example_01.c
 * @example theme_example.edc
 */

/**
 * @page theme_example_02 Theme - Using overlays
 *
 * @dontinclude theme_example_02.c
 *
 * Overlays are like extensions in that you tell Elementary that some other
 * theme contains the styles you need for your program. The difference is that
 * they will be look in first, so they can override the default style of any
 * widget.
 *
 * There's not much to say about them that hasn't been said in our previous
 * example about @ref theme_example_01 "extensions", so going quickly through
 * the code we have a function to load or unload the theme, which will be
 * called when we click any button.
 * @skipline Elementary.h
 * @skip static void
 * @until }
 *
 * And the main function, creating the window and adding some buttons to it.
 * We load our theme as an overlay and nothing else. Notice there's no style
 * set for any button there, which means they should be using the default
 * that we override.
 * @skip int
 * @until ELM_MAIN
 *
 * That's pretty much it. The full code is @ref theme_example_02.c "here" and
 * the definition of the theme is the same as before, and can be found in
 * @ref theme_example.edc "here".
 *
 * @example theme_example_02.c
 */

 /**
  * @page button_example_00 Button - Hello, Button!
  *
  * @dontinclude button_example_00.c
  *
  * Keeping the tradition, this is a simple "Hello, World" button example. We
  * will show how to create a button and associate and action to be performed
  * when you click on it.
  *
  * In the end, we'll be presented with something that looks like this:
  *
  * @image html screenshots/button_00.png
  * @image latex screenshots/button_00.eps width=\textwidth
  *
  * The full code of the example is @ref button_example_00.c "here" and we
  * will follow here with a rundown of it.
  *
  *
  * There is only one button on the interface which performs a basic action:
  * close the application. This behavior is described by on_click() function,
  * that interrupt the program invoking elm_exit().
  * @skip static void
  * @until }
  *
  *
  * On the main() function, we set the basic characteristics of the user
  * interface. First we use the Elementary library to create a window and
  * set its policies (such as close when the user click on the window close
  * icon).
  *
  * @skip elm_win_add
  * @until elm_policy_set
  *
  * In order to turn it visible on the WM (Window Manager), we also have to
  * associate it to a canvas through Evas library, and set its dimensions.
  *
  * @skip evas_object_resize
  * @until evas_object_show(win)
  *
  * Then we create a background associated to the window, define its dimensions,
  * and turn it visible on the canvas.
  * @skip  elm_bg_add
  * @until evas_object_show(bg)
  *
  *
  * Finally we use Elementary to create a button and Evas to set its
  * proprieties. Here we have not only to give the button dimensions, but also
  * its coordinates and the action to be performed on the click event.
  * @skip elm_button_add
  * @until evas_object_show(btn)
  *
  *
  * And we are done.
  *
  * @example button_example_00.c
  */

/**
  * @page button_example_01 Button - Complete example
  *
  * @dontinclude button_example_01.c
  *
  * A button is simple, you click on it and something happens. That said,
  * we'll go through an example to show in detail the button API less
  * commonly used.
  *
  * In the end, we'll be presented with something that looks like this:
  *
  * @image html screenshots/button_01.png
  * @image latex screenshots/button_01.eps width=\textwidth
  *
  * The full code of the example is @ref button_example_01.c "here" and we
  * will follow here with a rundown of it.
  *
  * @skip Elementary.h
  * @until Elementary.h
  * @skip struct
  * @until App_Data
  *
  * We have several buttons to set different times for the autorepeat timeouts
  * of the buttons that use it and a few more that we keep track of in our
  * data struct. The mid button doesn't do much, just moves around according
  * to what other buttons the user presses. Then four more buttons to move the
  * central one, and we're also keeping track of the icon set in the middle
  * button, since when this one moves, we change the icon, and when movement
  * is finished (by releasing one of the four arrow buttons), we set back the
  * normal icon.
  * @skip static void
  * @until }
  *
  * Keeping any of those four buttons pressed will trigger their autorepeat
  * callback, where we move the button doing some size hint magic. To
  * understand how that works better, refer to the @ref Box documentation.
  * Also, the first time the function is called, we change the icon in the
  * middle button, using elm_object_content_unset() first to keep the reference
  * to the previous one, so we don't need to recreate it when we are done
  * moving it.
  * @skip static void
  * @until }
  * @until size_hint_align_set
  * @until }
  *
  * One more callback for the option buttons, that just sets the timeouts for
  * the different autorepeat options.
  *
  * @skip static void
  * @until }
  * @until }
  * @until }
  *
  * And the main function, which does some setting up of the buttons in boxes
  * to make things work. Here we'll go through some snippets only.
  *
  * For the option buttons, it's just the button with its label and callback.
  * @skip elm_button_add
  * @until smart_callback_add
  *
  * For the ones that move the central button, we have no labels. There are
  * icons instead, and the autorepeat option is toggled.
  * @skip Gap: 1.0
  * @skip elm_button_add
  * @until data.cursors.up
  *
  * And just to show the mid button, which doesn't have anything special.
  * @skip data.cursors.left
  * @skip elm_button_add
  * @until data.mid
  *
  * And we are done.
  *
  * @example button_example_01.c
  */

/**
 * @page bubble_01_example_page elm_bubble - Simple use.
 * @dontinclude bubble_example_01.c
 *
 * This example shows a bubble with all fields set(label, info, content and
 * icon) and the selected corner changing when the bubble is clicked. To be
 * able use a bubble we need to do some setup and create a window, for this
 * example we are going to ignore that part of the code since it isn't
 * relevant to the bubble.
 *
 * To have the selected corner change in a clockwise motion we are going to
 * use the following callback:
 * @skip static
 * @until }
 * @until }
 *
 * Here we are creating an elm_label that is going to be used as the content
 * for our bubble:
 * @skipline elm_label
 * @until show
 * @note You could use any evas_object for this, we are using an elm_label
 * for simplicity.
 *
 * Despite it's name the bubble's icon doesn't have to be an icon, it can be
 * any evas_object. For this example we are going to make the icon a simple
 * blue rectangle:
 * @until show
 *
 * And finally we have the actual bubble creation and the setting of it's
 * label, info and content:
 * @until content
 * @skipline show
 * @note Because we didn't set a corner, the default("top_left") will be
 * used.
 *
 * Now that we have our bubble all that is left is connecting the "clicked"
 * signals to our callback:
 * @line smart_callback
 *
 * This last bubble we created was very complete, so it's pertinent to show
 * that most of that stuff is optional a bubble can be created with nothing
 * but content:
 * @until content
 * @skipline show
 *
 * Our example will look like this:
 *
 * @image html screenshots/bubble_example_01.png
 * @image latex screenshots/bubble_example_01.eps width=\textwidth
 *
 * See the full source code @ref bubble_example_01.c here.
 * @example bubble_example_01.c
 */

/**
 * @page box_example_01 Box - Basic API
 *
 * @dontinclude button_example_01.c
 *
 * As a special guest tonight, we have the @ref button_example_01 "simple
 * button example". There are plenty of boxes in it, and to make the cursor
 * buttons that moved a central one around when pressed, we had to use a
 * variety of values for their hints.
 *
 * To start, let's take a look at the handling of the central button when
 * we were moving it around. To achieve this effect without falling back to
 * a complete manual positioning of the @c Evas_Object in our canvas, we just
 * put it in a box and played with its alignment within it, as seen in the
 * following snippet of the callback for the pressed buttons.
 * @skip evas_object_size_hint_align_get
 * @until evas_object_size_hint_align_set
 *
 * Not much to it. We get the current alignment of the object and change it
 * by just a little, depending on which button was pressed, then set it
 * again, making sure we stay within the 0.0-1.0 range so the button moves
 * inside the space it has, instead of disappearing under the other objects.
 *
 * But as useful as an example as that may have been, the usual case with boxes
 * is to set everything at the moment they are created, like we did for
 * everything else in our main function.
 *
 * The entire layout of our program is made with boxes. We have one set as the
 * resize object for the window, which means it will always be resized with
 * the window. The weight hints set to @c EVAS_HINT_EXPAND will tell the
 * window that the box can grow past it's minimum size, which allows resizing
 * of it.
 * @skip elm_main
 * @skip elm_box_add
 * @until evas_object_show
 *
 * Two more boxes, set to horizontal, hold the buttons to change the autorepeat
 * configuration used by the buttons. We create each to take over all the
 * available space horizontally, but we don't want them to grow vertically,
 * so we keep that axis of the weight with 0.0. Then it gets packed in the
 * main box.
 * @skip box2
 * @until evas_object_show
 *
 * The buttons in each of those boxes have nothing special, they are just packed
 * in with their default values and the box will use their minimum size, as set
 * by Elementary itself based on the label, icon, finger size and theme.
 *
 * But the buttons used to move the central one have a special disposition.
 * The top one first, is placed right into the main box like our other smaller
 * boxes. Set to expand horizontally and not vertically, and in this case we
 * also tell it to fill that space, so it gets resized to take the entire
 * width of the window.
 * @skip Gap: 1.0
 * @skip elm_button_add
 * @until evas_object_show
 *
 * The bottom one will be the same, but for the other two we need to use a
 * second box set to take as much space as we have, so we can place our side
 * buttons in place and have the big empty space where the central button will
 * move.
 * @skip elm_box_add
 * @until evas_object_show
 *
 * Then the buttons will have their hints inverted to the other top and bottom
 * ones, to expand and fill vertically and keep their minimum size horizontally.
 * @skip elm_button_add
 * @until evas_object_show
 *
 * The central button takes every thing else. It will ask to be expanded in
 * both directions, but without filling its cell. Changing its alignment by
 * pressing the buttons will make it move around.
 * @skip elm_button_add
 * @until evas_object_show
 *
 * To end, the rightmost button is packed in the smaller box after the central
 * one, and back to the main box we have the bottom button at the end.
 */

/**
 * @page box_example_02 Box - Layout transitions
 *
 * @dontinclude box_example_02.c
 *
 * Setting a customized layout for a box is simple once you have the layout
 * function, which is just like the layout function for @c Evas_Box. The new
 * and fancier thing we can do with Elementary is animate the transition from
 * one layout to the next. We'll see now how to do that through a simple
 * example, while also taking a look at some of the API that was left
 * untouched in our @ref box_example_01 "previous example".
 *
 * @image html screenshots/box_example_02.png
 * @image latex screenshots/box_example_02.eps width=\textwidth
 *
 * @skipline Elementary.h
 *
 * Our application data consists of a list of layout functions, given by
 * @c transitions. We'll be animating through them throughout the entire run.
 * The box with the stuff to move around and the last layout that was set to
 * make things easier in the code.
 * @skip typedef
 * @until Transitions_Data
 *
 * The box starts with three buttons, clicking on any of them will take it
 * out of the box without deleting the object. There are also two more buttons
 * outside, one to add an object to the box and the other to clear it.
 * This is all to show how you can interact with the items in the box, add
 * things and even remove them, while the transitions occur.
 *
 * One of the callback we'll be using creates a new button, asks the box for
 * the list of its children and if it's not empty, we add the new object after
 * the first one, otherwise just place at the end as it will not make any
 * difference.
 * @skip static void
 * @until }
 * @until }
 *
 * The clear button is even simpler. Everything in the box will be deleted,
 * leaving it empty and ready to fill it up with more stuff.
 * @skip static void
 * @until }
 *
 * And a little function to remove buttons from the box without deleting them.
 * This one is set for the @c clicked callback of the original buttons,
 * unpacking them when clicked and placing it somewhere in the screen where
 * they will not disturb. Once we do this, the box no longer has any control
 * of it, so it will be left untouched until the program ends.
 * @skip static void
 * @until }
 *
 * If we wanted, we could just call @c evas_object_del() on the object to
 * destroy it. In this case, no unpack is really necessary, as the box would
 * be notified of a child being deleted and adjust its calculations accordingly.
 *
 * The core of the program is the following function. It takes whatever
 * function is first on our list of layouts and together with the
 * @c last_layout, it creates an ::Elm_Box_Transition to use with
 * elm_box_layout_transition(). In here, we tell it to start from whatever
 * layout we last set, end with the one that was at the top of the list and
 * when everything is finished, call us back so we can create another
 * transition. Finally, move the new layout to the end of the list so we
 * can continue running through them until the program ends.
 * @skip static void
 * @until }
 *
 * The main function doesn't have anything special. Creation of box, initial
 * buttons and some callback setting. The only part worth mentioning is the
 * initialization of our application data.
 * @skip tdata.box
 * @until evas_object_box_layout_stack
 *
 * We have a simple static variable, set the box, the first layout we are
 * using as last and create the list with the different functions to go
 * through.
 *
 * And in the end, we set the first layout and call the same function we went
 * through before to start the run of transitions.
 * @until _test_box_transition_change
 *
 * For the full code, follow @ref box_example_02.c "here".
 *
 * @example box_example_02.c
 */

/**
 * @page calendar_example_01 Calendar - Simple creation.
 * @dontinclude calendar_example_01.c
 *
 * As a first example, let's just display a calendar in our window,
 * explaining all steps required to do so.
 *
 * First you should declare objects we intend to use:
 * @skipline Evas_Object
 *
 * Then a window is created, a title is set and its set to be autodeleted.
 * More details can be found on windows examples:
 * @until elm_win_autodel
 *
 * Next a simple background is placed on our windows. More details on
 * @ref bg_01_example_page :
 * @until evas_object_show(bg)
 *
 * Now, the exciting part, let's add the calendar with elm_calendar_add(),
 * passing our window object as parent.
 * @until evas_object_show(cal);
 *
 * To conclude our example, we should show the window and run elm mainloop:
 * @until ELM_MAIN
 *
 * Our example will look like this:
 *
 * @image html screenshots/calendar_example_01.png
 * @image latex screenshots/calendar_example_01.eps width=\textwidth
 *
 * See the full source code @ref calendar_example_01.c here.
 * @example calendar_example_01.c
 */

/**
 * @page calendar_example_02 Calendar - Layout strings formatting.
 * @dontinclude calendar_example_02.c
 *
 * In this simple example, we'll explain how to format the label displaying
 * month and year, and also set weekday names.
 *
 * To format month and year label, we need to create a callback function
 * to create a string given the selected time, declared under a
 * <tt> struct tm </tt>.
 *
 * <tt> struct tm </tt>, declared on @c time.h, is a structure composed by
 * nine integers:
 * @li tm_sec   seconds [0,59]
 * @li tm_min   minutes [0,59]
 * @li tm_hour  hour [0,23]
 * @li tm_mday  day of month [1,31]
 * @li tm_mon   month of year [0,11]
 * @li tm_year  years since 1900
 * @li tm_wday  day of week [0,6] (Sunday = 0)
 * @li tm_yday  day of year [0,365]
 * @li tm_isdst daylight savings flag
 * @note glib version has 2 additional fields.
 *
 * For our function, only stuff that matters are tm_mon and tm_year.
 * But we don't need to access it directly, since there are nice functions
 * to format date and time, as @c strftime.
 * We will get abbreviated month (%b) and year (%y) (check strftime manpage
 * for more) in our example:
 * @skipline static char
 * @until }
 *
 * We need to alloc the string to be returned, and calendar widget will
 * free it when it's not needed, what is done by @c strdup.
 * So let's register our callback to calendar object:
 * @skipline elm_calendar_format_function_set
 *
 * To set weekday names, we should declare them as an array of strings:
 * @dontinclude calendar_example_02.c
 * @skipline weekdays[]
 * @until }
 *
 * And finally set them to calendar:
 * @skipline weekdays_names_set
 *
 * Our example will look like this:
 *
 * @image html screenshots/calendar_example_02.png
 * @image latex screenshots/calendar_example_02.eps width=\textwidth
 *
 * See the full source code @ref calendar_example_02.c here.
 * @example calendar_example_02.c
 */

/**
 * @page calendar_example_03 Calendar - Years restrictions.
 * @dontinclude calendar_example_03.c
 *
 * This example explains how to set max and min year to be displayed
 * by a calendar object. This means that user won't be able to
 * see or select a date before and after selected years.
 * By default, limits are 1902 and maximum value will depends
 * on platform architecture (year 2037 for 32 bits); You can
 * read more about time functions on @c ctime manpage.
 *
 * Straigh to the point, to set it is enough to call
 * elm_calendar_min_max_year_set(). First value is minimum year, second
 * is maximum. If first value is negative, it won't apply limit for min
 * year, if the second one is negative, won't apply for max year.
 * Setting both to negative value will clear limits (default state):
 * @skipline elm_calendar_min_max_year_set
 *
 * Our example will look like this:
 *
 * @image html screenshots/calendar_example_03.png
 * @image latex screenshots/calendar_example_03.eps width=\textwidth
 *
 * See the full source code @ref calendar_example_03.c here.
 * @example calendar_example_03.c
 */

/**
 * @page calendar_example_04 Calendar - Days selection.
 * @dontinclude calendar_example_04.c
 *
 * It's possible to disable date selection and to select a date
 * from your program, and that's what we'll see on this example.
 *
 * If isn't required that users could select a day on calendar,
 * only interacting going through months, disabling days selection
 * could be a good idea to avoid confusion. For that:
 * @skipline elm_calendar_select_mode_set
 *
 * Also, regarding days selection, you could be interested to set a
 * date to be highlighted on calendar from your code, maybe when
 * a specific event happens, or after calendar creation. As @c time output is
 * in seconds, we define the number of seconds contained within a day as a
 * constant:
 * @dontinclude calendar_example_04.c
 * @skipline SECS_DAY
 *
 * Now let's select two days from current day:
 * @skipline time(NULL)
 * @until elm_calendar_selected_time_set
 *
 * Our example will look like this:
 *
 * @image html screenshots/calendar_example_04.png
 * @image latex screenshots/calendar_example_04.eps width=\textwidth
 *
 * See the full source code @ref calendar_example_04.c here.
 * @example calendar_example_04.c
 */

/**
 * @page calendar_example_05 Calendar - Signal callback and getters.
 * @dontinclude calendar_example_05.c
 *
 * Most of setters explained on previous examples have associated getters.
 * That's the subject of this example. We'll add a callback to display
 * all calendar information every time user interacts with the calendar.
 *
 * Let's check our callback function:
 * @skipline static void
 * @until double interval;
 *
 * To get selected day, we need to call elm_calendar_selected_time_get(),
 * but to assure nothing wrong happened, we must check for function return.
 * It'll return @c EINA_FALSE if fail. Otherwise we can use time set to
 * our structure @p stime.
 * @skipline elm_calendar_selected_time_get
 * @until return
 *
 * Next we'll get information from calendar and place on declared vars:
 * @skipline interval
 * @until elm_calendar_weekdays_names_get
 *
 * The only tricky part is that last line gets an array of strings
 * (char arrays), one for each weekday.
 *
 * Then we can simple print that to stdin:
 * @skipline printf
 * @until }
 *
 * <tt> struct tm </tt> is declared on @c time.h. You can check @c ctime
 * manpage to read about it.
 *
 * To register this callback, that will be called every time user selects
 * a day or goes to next or previous month, just add a callback for signal
 * @b changed.
 * @skipline evas_object_smart_callback_add
 *
 * Our example will look like this:
 *
 * @image html screenshots/calendar_example_05.png
 * @image latex screenshots/calendar_example_05.eps width=\textwidth
 *
 * See the full source code @ref calendar_example_05.c here.
 * @example calendar_example_05.c
 */

/**
 * @page calendar_example_06 Calendar - Calendar marks.
 * @dontinclude calendar_example_06.c
 *
 * On this example marks management will be explained. Functions
 * elm_calendar_mark_add(), elm_calendar_mark_del() and
 * elm_calendar_marks_clear() will be covered.
 *
 * To add a mark, will be required to choose three things:
 * @li mark style
 * @li mark date, or start date if it will be repeated
 * @li mark periodicity
 *
 * Style defines the kind of mark will be displayed over marked day,
 * on calendar. Default theme supports @b holiday and @b checked.
 * If more is required, is possible to set a new theme to calendar
 * widget using elm_object_style_set(), and use
 * the signal that will be used by such marks.
 *
 * Date is a <tt> struct tm </tt>, as defined by @c time.h. More can
 * be read on @c ctime manpage.
 * If a date relative from current is required, this struct can be set
 * as:
 * @skipline time(NULL)
 * @until localtime_r
 *
 * Or if it's an absolute date, you can just declare the struct like:
 * @dontinclude calendar_example_06.c
 * @skipline sunday
 * @until christmas.tm_mon
 *
 * Periodicity is how frequently the mark will be displayed over the
 * calendar.  Can be a unique mark (that don't repeat), or it can repeat
 * daily, weekly, monthly or annually. It's enumerated by
 * @c Elm_Calendar_Mark_Repeat_Type.
 *
 * So let's add some marks to our calendar. We will add christmas holiday,
 * set Sundays as holidays, and check current day and day after that.
 * @dontinclude calendar_example_06.c
 * @skipline sunday
 * @until christmas.tm_mon
 * @skipline current_time
 * @until ELM_CALENDAR_WEEKLY
 *
 * We kept the return of first mark add, because we don't really won't it
 * to be checked, so let's remove it:
 * @skipline elm_calendar_mark_del
 *
 * After all marks are added and removed, is required to draw them:
 * @skipline elm_calendar_marks_draw
 *
 * Finally, to clear all marks, let's set a callback for our button:
 * @skipline elm_button_add
 * @until evas_object_show(bt);
 *
 * This callback will receive our calendar object, and should clear it:
 * @dontinclude calendar_example_06.c
 * @skipline static
 * @until }
 * @note Remember to draw marks after clear the calendar.
 *
 * Our example will look like this:
 *
 * @image html screenshots/calendar_example_06.png
 * @image latex screenshots/calendar_example_06.eps width=\textwidth
 *
 * See the full source code @ref calendar_example_06.c here.
 * @example calendar_example_06.c
 */

/**
 * @page spinner_example Spinner widget example
 *
 * This code places seven Elementary spinner widgets on a window, each of
 * them exemplifying a part of the widget's API.
 *
 * The first of them is the default spinner:
 * @dontinclude spinner_example.c
 * @skipline elm_spinner_add
 * @until evas_object_show
 * As you see, the defaults for a spinner are:
 * @li no wrap
 * @li min value set to 0
 * @li max value set to 100
 * @li step value set to 1
 * @li label format set to "%0.f"
 *
 * If another format is required, see the second spinner. It will put a text
 * before and after the value, and also format value to display two decimals:
 * @skipline format_set
 *
 * The third one will use a customized step, define new minimum and maximum
 * values and enable wrap, so when value reaches minimum it jumps to maximum,
 * or jumps to minimum after maximum value is reached. Format is set to display
 * a decimal:
 * @skipline elm_spinner_add
 * @until evas_object_show
 *
 * The fourth uses @c vertical style, so instead of left and right arrows,
 * top and bottom are displayed. Also the change interval is reduced, so
 * user can change value faster.
 * @skipline style
 * @skipline interval
 *
 * In the fifth the user won't be allowed to set value directly, i.e., will
 * be obligate change value only using arrows:
 * @skipline editable
 *
 * The sixth widget will receive a lot of special values, so
 * instead of reading numeric values, user will see labels for each one.
 * Also direct edition is disabled, otherwise users would see the numeric
 * value on edition mode. User will be able to select a month in this widget:
 * @skipline elm_spinner_add
 * @until evas_object_show
 *
 * Finally the last widget will exemplify how to listen to widget's signals,
 * <tt> changed </tt> and <tt> delay,changed </tt>. First we need to
 * implement callback functions that will simply print spinner's value:
 * @dontinclude spinner_example.c
 * @skip static
 * @skip }
 * @skipline static
 * @until }
 * @until }
 *
 * The first callback function should be called everytime value changes,
 * the second one only after user stops to increment or decrement. Try
 * to keep arrows pressed and check the difference.
 * @skip smart_callback
 * @skipline smart_callback
 * @skipline smart_callback
 *
 * See the full @ref spinner_example.c "example", whose window should
 * look like this picture:
 *
 * @image html screenshots/spinner_example.png
 * @image latex screenshots/spinner_example.eps width=\textwidth
 *
 * See the full @ref spinner_example.c "source code" for this example.
 *
 * @example spinner_example.c
 */

/**
 * @page slider_example Slider widget example
 *
 * This code places seven Elementary slider widgets on a window, each of
 * them exemplifying a part of the widget's API.
 *
 * The first of them is the default slider:
 * @dontinclude slider_example.c
 * @skipline elm_slider_add
 * @until evas_object_show
 *
 * As you see, the defaults for a slider are:
 * @li horizontal
 * @li no label
 * @li no values (on indicator or unit labels)
 *
 * Actually it's pretty useless this way. So let's learn how to improve it.
 *
 * If some decoration is required, a label can be set, and icon before and
 * after the bar as well. On the second slider will add a @c home icon
 * and a @c folder icon at @c end.
 * @skip elm_object_text_set
 * @until elm_object_part_content_set(sl, "end", ic)
 *
 * If the bar size need to be changed, it can be done with span set function,
 * that doesn't accounts other widget's parts size. Also the bar can starts
 * with a not default value (0.0), as we done on third slider:
 * @skipline value_set
 * @skipline span_size_set
 *
 * So far, users won't be able to see the slider value. If it's required,
 * it can be displayed in two different areas, units label or above
 * the indicator.
 *
 * Let's place a units label on our widget, and also let's set minimum and
 * maximum value (uses 0.0 and 1.0 by default):
 * @skipline unit_format_set
 * @skipline min_max_set
 *
 * If above the indicator is the place to display the value, just set it.
 * Also, is possible to invert a bar, as you can see:
 * @skipline indicator_format_set
 * @skipline inverted_set
 *
 * But if you require to use a function a bit more customized to show the value,
 * is possible to registry a callback function that will be called
 * to display unit or indicator label. Only the value will be passed to this
 * function, that should return a string.
 * In this case, a function to free this string will be required.
 *
 * Let's exemplify with indicator label on our sixth slider:
 * @dontinclude slider_example.c
 * @skip static
 * @skip }
 * @skip static
 * @skip }
 * @skip static
 * @skip }
 * @skipline static
 * @until }
 * @until }
 *
 * Setting callback functions:
 * @skipline indicator_format_function_set
 * @skipline _indicator_free
 *
 * Also, a slider can be displayed vertically:
 * @dontinclude slider_example.c
 * @skipline elm_slider_horizontal_set
 *
 * Finally the last widget will exemplify how to listen to widget's signals,
 * <tt> changed </tt> and <tt> delay,changed </tt>. First we need to
 * implement callback functions that will simply print slider's value:
 * @dontinclude slider_example.c
 * @skip static
 * @skip }
 * @skipline static
 * @until }
 * @until }
 *
 * The first callback function should be called everytime value changes,
 * the second one only after user stops to increment or decrement. Try
 * to keep arrows pressed and check the difference.
 * @skip smart_callback
 * @skipline smart_callback
 * @skipline smart_callback
 *
 * See the full @ref slider_example.c "example", whose window should
 * look like this picture:
 *
 * @image html screenshots/slider_example.png
 * @image latex screenshots/slider_example.eps width=\textwidth
 *
 * See the full @ref slider_example.c "source code" for this example.
 *
 * @example slider_example.c
 */

/**
 * @page panes_example Panes widget example
 *
 * This code places two Elementary panes widgets on a window, one of them
 * displayed vertically and the other horizontally, to exemplify
 * a part of the widget's API. Also, all the signals emitted by this
 * widget will be covered.
 *
 * Let's start adding a panes to our window:
 * @dontinclude panes_example.c
 * @skipline elm_panes_add
 * @until evas_object_show
 *
 * Now we will set a content (a simple button) to the left side of our
 * panes widget:
 * @skipline elm_button_add
 * @until content_left_set
 *
 * The content of the right side will be something a bit more elaborated, we'll
 * place another panes, displayed vertically (it's displayed horizontally
 * by default):
 * @skipline elm_panes_add
 * @until content_right_set
 *
 * When populating a panes displayed vertically, remember that left content
 * will be placed at top, and right content will place at bottom. Next
 * we will add two buttons to exemplify that:
 * @skipline elm_button_add
 * @until content_right_set
 *
 * Panes widgets emits 4 different signals, depending on users interaction
 * with the draggable bar. We'll add a callback function for each of them.
 *
 * <tt> "clicked" signal </tt>:
 *
 * Callback function that just print "Clicked" to stdin:
 * @dontinclude panes_example.c
 * @skip static void
 * @skip }
 * @skip static void
 * @skip }
 * @skip static void
 * @skip }
 * @skipline static void
 * @until }
 *
 * Also, add callback function to the panes:
 * @skipline "clicked"
 *
 * <tt> "press" signal </tt>:
 *
 * Callback function that just print "Pressed" to stdin:
 * @dontinclude panes_example.c
 * @skip static void
 * @skip }
 * @skipline static void
 * @until }
 *
 * Also, add callback function to the panes:
 * @skipline "press"
 *
 * Now, let's try to make our callback functions a bit more useful:
 *
 * <tt> "unpress" signal </tt>:
 *
 * Suppose we want to know the size proportion of left content after
 * user drags the bar. We need to listen for @c unpress signal, and
 * get this size from our panes widget. It's done on the following
 * function:
 * @dontinclude panes_example.c
 * @skip static void
 * @skip }
 * @skip static void
 * @skip }
 * @skipline static void
 * @until }
 *
 * Adding the callback function to the panes:
 * @skipline "unpress"

 * <tt> "clicked,double" signal </tt>:
 *
 * Now, a interesting feature that could be addded to panes widget.
 * Hide a content when user double click the draggable bar. It's done
 * using a variable to store size and content left size getter and setter
 * on the following function:
 * @dontinclude panes_example.c
 * @skipline static double
 * @skip static void
 * @skip }
 * @skip static void
 * @skip }
 * @skip static void
 * @skip }
 * @skipline static void
 * @until }
 * @until }
 * @until }
 *
 * Adding the callback function to the panes:
 * @skipline "clicked,double"
 * @until panes);
 *
 * See the full @ref panes_example.c "example", whose window should
 * look like this picture:
 *
 * @image html screenshots/panes_example.png
 * @image latex screenshots/panes_example.eps width=\textwidth
 *
 * @example panes_example.c
 */

/**
 * @page clock_example Clock widget example
 *
 * This code places five Elementary clock widgets on a window, each of
 * them exemplifying a part of the widget's API.
 *
 * The first of them is the pristine clock:
 * @dontinclude clock_example.c
 * @skip pristine
 * @until evas_object_show
 * As you see, the defaults for a clock are:
 * - military time
 * - no seconds shown
 *
 * For am/pm time, see the second clock:
 * @dontinclude clock_example.c
 * @skip am/pm
 * @until evas_object_show
 *
 * The third one will show the seconds digits, which will flip in
 * synchrony with system time. Note, besides, that the time itself is
 * @b different from the system's -- it was customly set with
 * elm_clock_time_set():
 * @dontinclude clock_example.c
 * @skip with seconds
 * @until evas_object_show
 *
 * In both fourth and fifth ones, we turn on the <b>edition
 * mode</b>. See how you can change each of the sheets on it, and be
 * sure to try holding the mouse pressed over one of the sheet
 * arrows. The forth one also starts with a custom time set:
 * @dontinclude clock_example.c
 * @skip in edition
 * @until evas_object_show
 *
 * The fifth, besides editable, has only the time @b units editable,
 * for hours, minutes and seconds. This exemplifies
 * elm_clock_edit_mode_set():
 * @dontinclude clock_example.c
 * @skip but only
 * @until evas_object_show
 *
 * See the full @ref clock_example.c "example", whose window should
 * look like this picture:
 *
 * @image html screenshots/clock_example.png
 * @image latex screenshots/clock_example.eps width=\textwidth
 *
 * See the full @ref clock_example_c "source code" for this example.
 *
 */

/**
 * @page datetime_example Datetime widget example
 *
 * This code places three Elementary Datetime widgets on a window, each of
 * them exemplifying the widget's different usage.
 *
 * The first of them is <b>"only Date display"</b>:
 * @dontinclude datetime_example.c
 * @skip only DATE
 * @until evas_object_show
 *
 * For <b>"only Time display"</b>, see the second datetime:
 * @dontinclude datetime_example.c
 * @skip only TIME
 * @until evas_object_show
 *
 * The third one will display datetime shows both <b>Date and Time</b>, corresponding format will be
 * taken from system @b locale. Note, besides, that the strings are different
 *  for different language settings.
 *
 * <b>Datetime format</b> can be programmatically set by using
 * elm_datetime_format_set():
 * @dontinclude datetime_example.c
 * @skip DATE and TIME
 * @until evas_object_show
 * The default format of any locale consists:
 * - Year Field
 * - Month Field
 * - Date Field
 * - Hour Field(12hr/24hr format)
 * - Minute Field
 * - AM/PM (if exists).
 *
 * This is how the example program's window looks like with the datetime widget
 * showing only date, only time and both date & time:
 *
 * @image html screenshots/datetime_example.png
 * @image latex screenshots/datetime_example.eps width=\textwidth
 *
 * See the full @ref datetime_example_c "source code" for
 * this example.
 *
 */

/**
 * @page dayselector_example Dayselector widget example
 *
 * This code places two Elementary dayselector widgets on a window, each of
 * them exemplifying the different widget styles.
 *
 * The first of them is the dayselector in default style:
 * @dontinclude dayselector_example.c
 * @skip weekdays starting from Sunday
 * @until evas_object_show
 *
 * As you see, the default style displays the weekdays starting from Sunday.
 *
 * One can select/unselect a day just by clicking on the day object.
 * The selection toggles once it is being pressed.
 *
 *
 * For showing weekdays starting from Monday, see the second dayselector:
 * @dontinclude dayselector_example.c
 * @skip weekdays starting from Monday
 * @until evas_object_show
 *
 *
 * The following code exemplifies the selection APIs of Dayselector:
 * @dontinclude dayselector_example.c
 * @skip Callback function
 * @until End of clicked callback
 *
 *
 * See the full @ref dayselector_example.c "example", whose window should
 * look like this picture:
 *
 * @image html screenshots/dayselector_example.png
 * @image latex screenshots/dayselector_example.eps width=\textwidth
 *
 * See the full @ref dayselector_example_c "source code" for this example.
 *
 */

/**
 * @page mapbuf_example Mapbuf Widget Example
 *
 * This code places an Elementary mapbuf widget on a window,
 * to exemplify part of the widget's API.
 *
 * First we'll add an window with a background and a vertical box to
 * pack our interface elements:
 * @dontinclude mapbuf_example.c
 * @skipline win_add
 * @until show(bx)
 *
 * Next we'll simply add the mapbuf widget to the box:
 * @skipline mapbuf_add
 * @until pack_end
 *
 * But mapbuf is a container widget, it won't do anything alone. So let's
 * create a table full of icons. For that we'll loop to fill each line of each
 * column. See @ref tutorial_table_01 "tutorial_table_01"
 * if you don't know how to use tables:
 * @skipline table_add
 * @until }
 * @until }
 *
 * Finally, setting mapbuf content:
 * @skipline content_set
 * @skipline show
 *
 * Also, would be good a horizontal box with some controls to change mapbuf
 * behavior:
 * @skipline box_add
 * @until show
 *
 * By default map is disabled. So just setting content isn't enough.
 * Alpha and smooth settings will be applied when map is enabled.
 * So we'll add a check for that. Everytime the map properties
 * are changed, map will need to be enabled again. So if you
 * want to play a bit with our example, remember to always enable
 * map again after concluding your changes.
 * @skipline check_add
 * @until show
 *
 * We have added a callback function to this check, so it will enable
 * or disable map:
 * @dontinclude mapbuf_example.c
 * @skip static
 * @skip }
 * @skipline static
 * @until }
 *
 * Let's add check boxes for alpha blending and smooth rendering:
 * @skipline check_add
 * @until show
 * @until show
 *
 * By default, mapbuf would enable alpha blending and smooth rendering,
 * so we need to check boxes to be consistent with its behavior.
 *
 * Callback functions look like the one added to the check. This way we
 * could enable or disable the both properties:
 * @dontinclude mapbuf_example.c
 * @skip static
 * @skip }
 * @skip static
 * @skip }
 * @skipline static
 * @until }
 * @until }
 *
 * You'll see that disabling alpha blending will set a black rectangle below
 * the icons. That's the reason you only should enable that when you're sure
 * the mapbuf content is 100% solid.
 *
 * See @ref mapbuf_example.c "mapbuf_example.c", whose window should
 * look like this picture:
 *
 * @image html screenshots/mapbuf_example.png
 * @image latex screenshots/mapbuf_example.eps width=\textwidth
 *
 * @example mapbuf_example.c
 */

/**
 * @page map_example_01 Map Example - Creation and Zoom
 *
 * This code places an Elementary map widget on a window,
 * to exemplify part of the widget's API.
 *
 * Let's start adding a map to our window:
 * @dontinclude map_example_01.c
 * @skipline elm_map_add
 * @until evas_object_show
 *
 * It's enough to display a world map inside our window. But usually you'll
 * need to let user interact with the map. We need to place some buttons,
 * so the user could control the map. It's done on the following code.
 * If you don't know about boxes, or buttons, check their examples,
 * @ref box_example_01 "Box Example 1" and
 * @ref button_example_01 "Button Example 1".
 * @skipline elm_box_add
 * @until _bt_zoom_fill
 *
 * We are adding callback functions that will be called when the user clicks
 * over these buttons. Let's study such functions, starting from the function
 * that will zoom in the map:
 * @dontinclude map_example_01.c
 * @skipline static void
 * @until }
 *
 * First thing done is assure zoom mode is set to manual. It's the default
 * mode, but the other buttons will change this, so before setting a new
 * zoom value, we need to change the zoom mode.
 *
 * Then, we get the current zoom value, increment that, and set the new
 * value to the map. If it's bigger than max zoom value allowed, it will
 * remain on the maximum allowed, nothing bad will happen. This way we
 * don't need to check first if it won't be bigger than max.
 *
 * Zoom out function is basically the same thing, but zoom will be decremented
 * instead of incremented:
 * @skipline static void
 * @until }
 *
 * The "X" button, when pressed, will call a function that will
 * zoom the map until it fits
 * inside the scroll frame with no pixels outside this area:
 * @skipline static void
 * @until }
 *
 * And the "#" button, will call a function that will zoom until map fills
 * scroll, ensuring no pixels are left unfilled:
 * @skipline static void
 * @until }
 *
 * But we can also set map to show something different from default
 * world map, changing the zoom level and region shown. Let's pick a
 * wonderful city coordinates, one placed at <tt> 43 20 S, 22 90 W </tt>.
 * Since map uses double variables to represent latitude and longitude,
 * to represent north or east, we should represent it as positive values,
 * and south or west as negative. Also, the value will be represented as
 * degree.min. So, for example, our longitude <tt> 43 20 S </tt> will
 * be represented
 * by the value <tt> -43.20 </tt>. A zoom set to @c 12 should be enough
 * to show a city.
 * @skipline region_show
 * @until zoom_set
 *
 * See @ref map_example_01.c "map_example_01.c" for full source,
 * whose window should
 * look like this picture:
 *
 * @image html screenshots/map_example_01.png
 * @image latex screenshots/map_example_01.eps width=\textwidth
 *
 * @example map_example_01.c
 */

/**
 * @page map_example_02 Map Example - Overlay Usage
 *
 * This code places an Elementary map widget on a window,
 * to exemplify part of the widget's API, related to overlays.
 *
 * We'll start this example in the same way as
 * @ref map_example_01 "Map Example 1". Adding a map with buttons to control
 * zoom, so if you didn't read it yet, just do it now.
 * @dontinclude map_example_02.c
 * @skipline elm_map_add
 * @until zoom_fill
 *
 * Overlays can be placed over the map to represent anything we want. Let's
 * say we want to represent some countries and cities with overlays.
 *
 * Before we create city or country overlays, let's create class overlays.
 *
 * @skipline elm_map_overlay_class_add
 * @until elm_map_overlay_icon_set
 * These lines create a class overlay which represents cities.
 * This class overlay will be used for grouping city overlays.
 * Later city overlays in the same class are appended to this class overlay.
 * if city overlays are near each other, they will be grouped.
 *
 * We can set the icon for the class so that the icon will be displayed
 * when city overlays are grouped.
 * We can set the zoom required to display the overlays that belongs
 * to this class, so if the zoom is less than this value, nothing
 * will be shown.
 *
 * Country class can be created in the same way.
 * @skipline elm_map_overlay_class_add
 * @until elm_map_overlay_icon_set
 *
 * Next we'll create some overlays representing cities and countries.
 * We set the data for the overlay so that can be used later when
 * clicked callback is called.
 * We'll append them into city class to be grouped.
 * We'll append them in a list, to close up them later.
 * To create a default overlay, we need to pass the coordinates.
 * @skipline elm_map_overlay_add
 * @until eina_list_append
 *
 * We subscribe a smart callback "overlay,clicked" to create bubble on
 * the clicked overlay.
 * @dontinclude map_example_02.c
 * @skipline "overlay,clicked"
 *
 * Finally, on our @c main function, we ask the map to show all the overlays
 * with the biggest zoom possible, passing the list of overlays added.
 * @skipline elm_map_overlays_show
 *
 * We have created a specific structure for this example to store the name
 * of the place and a path to a image file to represent it.
 * @dontinclude map_example_02.c
 * @skipline typedef
 * @until Overlay_Data;
 *
 * We'll create instances for each place:
 * @skipline argentina
 * @until sky_03
 *
  * To return an icon, all we need to do is to add a elm_icon and return it:
 * @dontinclude map_example_02.c
 * @skipline _icon_get(
 * @until }
 *
 * For the content, let's return something more elaborate. We will return
 * a box with an image representing the place, and the name of this place:
 * @skipline _box_get(
 * @until }
 *
 * See @ref map_example_02.c "map_example_02.c" for full source,
 * whose window should
 * look like this picture:
 *
 * @image html screenshots/map_example_02.png
 * @image latex screenshots/map_example_02.eps width=\textwidth
 *
 * @example map_example_02.c
 */

/**
 * @page map_example_03 Map Example - Route and Name Usage
 *
 * This code places an Elementary map widget on a window,
 * to exemplify part of the widget's API, related routes and names.
 *
 * In this example, we will suppose we need to set a route for the user
 * from his current point (a gps could provide us this information)
 * to somewhere else. So we would have coordinates of this
 * start point, and would like that he enters the address of his
 * destination in a entry, and we'll trace a route on the map.
 *
 * We'll start this example in the same way
 * @ref map_example_01 "Map Example 1". Adding a map with buttons to control
 * zoom, so if you didn't read it yet, just do it now. Actually there is
 * a change, that we're aligning buttons to the top, since we wan't a
 * vertical control box this time.
 * @dontinclude map_example_03.c
 * @skipline elm_map_add
 * @until zoom_fill
 * @until align_set
 *
 * Next we set the box to be vertical and change it's size, weight
 * and alignment, so it will occupy the top of the window, from left
 * to right:
 * @skipline horizontal_set
 * @until align_set
 *
 * We'll add an entry with a preliminar address, that I know will
 * find a coordinate, to examplify names work. But you can try
 * lots of addresses. From city or country names to pubs, or whatever
 * you want. To try is enough to run the example, type the address and
 * press "Route" button. This button will call a function that will
 * get the typed address and find the route.
 * @skipline entry_add
 * @until align_set
 * @until align_set
 *
 * The button pass an structure
 * instance we make for this example, with all the fields we'll need.
 * @dontinclude map_example_03.c
 * @skipline _Example_Data
 * @until example_data;
 *
 * Let's initialize it's fields:
 * @skipline example_data.map
 * @until example_data.start_lat
 *
 * @c map and @c entry are our elementary objects, @c route is set to @c NULL,
 * since we don't have one yet, and the coordinates of the start point is set
 * (longitude and latitude).
 *
 * Also, let's show this start point at the center of the map, and set a zoom
 * nice enough to close it:
 * @skipline region_show
 * @until zoom_set
 *
 * These lines were already explained on @ref map_example_02 "Map Example 2".
 *
 * Now we'll see the "Route" button callback function:
 * @dontinclude map_example_03.c
 * @skip static void
 * @skip }
 * @skipline static void
 * @until }
 *
 * First we get the address string from our entry. Then we use @c name
 * conversion
 * util functions, so we could get coordinates for this address. These
 * functions return an #Elm_Map_Name handle for us.
 * Function elm_map_name_geo_request() will do this job for us,
 * but it's an asynchronous function, since it requires this
 * information from the server.
 *
 * That's the reason we need to wait for
 * <tt> "name,loaded" </tt> signal. We add a callback function for this:
 * @dontinclude map_example_03.c
 * @skipline static void
 * @until }
 *
 * This function will check if a previous route was traced, and if it was,
 * it will remove it. Next we'll get destination coordinates from our
 * @c name, and use them to add a new route.
 *
 * To trace a route we need to know how the user will go through the path.
 * Let's suppose he'll be walking, but doesn't like to walk, so we
 * need to choose the shortest path instead of the route that would
 * made him spend less time. Coordinates of the point from where he will
 * start and of the destination point need to be passed as well.
 *
 * Finally we'll set a color different from solid red (default), to show
 * our route. We set it green.
 *
 * See @ref map_example_03.c "map_example_03.c" for full source,
 * whose window should
 * look like this picture:
 *
 * @image html screenshots/map_example_03.png
 * @image latex screenshots/map_example_03.eps width=\textwidth
 *
 * @example map_example_03.c
 */

/**
 * @page diskselector_example_01 Diskselector widget example
 *
 * This code places 4 Elementary diskselector widgets on a window, each of
 * them exemplifying a part of the widget's API.
 *
 * All of them will have weekdays as items, since we won't focus
 * on items management on this example. For an example about this subject,
 * check @ref diskselector_example_02.
 *
 * The first of them is a default diskselector.
 * @dontinclude diskselector_example_01.c
 * @skipline lbl
 * @until }
 * @skipline elm_diskselector_add
 * @until evas_object_show
 *
 * We are just adding the diskselector, so as you can see, defaults for it are:
 * @li Only 3 items visible each time.
 * @li Only 3 characters are displayed for labels on side positions.
 * @li The first added item remains centeres, i.e., it's the selected item.
 *
 * To add items, we are just appending it on a loop, using function
 * elm_diskselector_item_append(), that will be better explained on
 * items management example.
 *
 * For a circular diskselector, check the second widget. A circular
 * diskselector will display first item after last, and last previous to
 * the first one. So, as you can see, @b Sa will appears on left side
 * of selected @b Sunday. This property is set with
 * elm_diskselector_round_enabled_set().
 *
 * Also, we decide to display only 2 character for side labels, instead of 3.
 * For this we call elm_diskselector_side_text_max_length_set(). As result,
 * we'll see @b Mo displayed instead of @b Mon, when @b Monday is on a
 * side position.
 *
 * @skipline elm_diskselector_add
 * @until evas_object_show
 *
 * But so far, we are only displaying 3 items at once. If more are wanted,
 * is enough to call elm_diskselector_display_item_num_set(), as you can
 * see here:
 * @skipline elm_diskselector_add
 * @until elm_diskselector_display_item_num_set
 *
 * @note You can't set less than 3 items to be displayed.
 *
 * You can get the number of items in the diskselector by calling
 * elm_diskselector_display_item_num_get(), as you can see here:
 * @skipline elm_diskselector_display_item_num_get
 *
 * Finally, if a bounce effect is required, or you would like to see
 * scrollbars, it is possible. But, for default theme, diskselector
 * scrollbars will be invisible anyway.
 * @skipline elm_diskselector_add
 * @until evas_object_show
 *
 * See the full @ref diskselector_example_01.c "diskselector_example_01.c"
 * code, whose window should look like this picture:
 *
 * @image html screenshots/diskselector_example_01.png
 * @image latex screenshots/diskselector_example_01.eps width=\textwidth
 *
 * @example diskselector_example_01.c
 */

/**
 * @page diskselector_example_02 Diskselector - Items management
 *
 * This code places an Elementary diskselector widgets on a window,
 * along with some buttons trigerring actions on it (though its API).
 * It covers most of diskselector item functions.
 *
 * On our @c main function, we are adding a default diskselector with
 * 3 items. We are only setting their labels (second parameter of function
 * elm_diskselector_item_append):
 * @dontinclude diskselector_example_02.c
 * @skipline elm_diskselector_add
 * @until Item 2
 *
 * Next we are adding lots of buttons, each one for a callback function
 * that will realize a task covering part of diskselector items API.
 * Lets check the first one:
 * @skipline elm_button_add
 * @until evas_object_show
 *
 * We are labeling the button with a task description with
 * elm_object_text_set() and setting a callback
 * function evas_object_smart_callback_add().
 * Each callback function will have the signature:
 * <tt> static void _task_cb(void *data, Evas_Object *obj,
 * void *event_info)</tt> with the function name varying for each task.
 *
 * Now let's cover all of them.
 *
 * <b> Appending an item: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _add_cb
 * @until }
 *
 * All items are included on diskselector after last one. You @b can't
 * prepend items.
 *
 * The first parameter of elm_diskselector_item_append() is the diskselector
 * object, that we are receiving as data on our callback function.
 * The second one is a label, the string that will be placed in the center
 * of our item. As we don't wan't icons or callback functions, we can
 * send NULL as third, fourth and fifth parameters.
 *
 * <b> Appending an item with icon: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _add_ic_cb
 * @until }
 *
 * If an icon is required, you can pass it as third parameter on our
 * elm_diskselector_item_append() function. It will be place on the
 * left side of item's label, that will be shifted to right a bit.
 *
 * For more details about how to create icons, look for elm_icon examples.
 *
 * <b> Appending an item with callback function for selected: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _sel_cb
 * @until }
 * @until }
 *
 * To set a callback function that will be called every time an item is
 * selected, i.e., everytime the diskselector stops with this item in
 * center position, just pass the function as fourth parameter.
 *
 * <b> Appending an item with callback function for selected with data: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _sel_data_cb
 * @until }
 * @until }
 * @until }
 * @until }
 *
 * If the callback function request an extra data, it can be attached to our
 * item passing a pointer for data as fifth parameter.
 * Our function _sel_data_cb will receive it as <tt> void *data </tt>.
 *
 * If you want to free this data, or handle that the way you need when the
 * item is deleted, set a callback function for that, with
 * elm_object_item_del_cb_set().
 *
 * As you can see we check if @c it is not @c NULL after appending it.
 * If an error happens, we won't try to set a function for it.
 *
 * <b> Deleting an item: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _del_cb(void
 * @until }
 *
 * To delete an item we simple need to call elm_object_item_del() with
 * a pointer for such item.
 *
 * If you need, you can get selected item with
 * elm_diskselector_selected_item_get(), that will return a pointer for it.
 *
 * <b> Unselecting an item: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _unselect_cb
 * @until }
 *
 * To select an item, you should call elm_diskselector_item_selected_set()
 * passing @c EINA_TRUE, and to unselect it, @c EINA_FALSE.
 *
 * If you unselect the selected item, diskselector will automatically select
 * the first item.
 *
 * <b> Printing all items: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _print_cb
 * @until }
 *
 * <b> Clearing the diskselector: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _clear_cb
 * @until }
 *
 * <b> Selecting the first item: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _select_first_cb
 * @until }
 *
 * <b> Selecting the last item: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _select_last_cb
 * @until }
 *
 * <b> Selecting the next item: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _select_next_cb
 * @until }
 *
 * <b> Selecting the previous item: </b>
 * @dontinclude diskselector_example_02.c
 * @skipline _select_prev_cb
 * @until }
 *
 * See the full @ref diskselector_example_02.c "diskselector_example_02.c"
 * code, whose window should look like this picture:
 *
 * @image html screenshots/diskselector_example_02.png
 * @image latex screenshots/diskselector_example_02.eps width=\textwidth
 *
 * @example diskselector_example_02.c
 */

/**
 * @page list_example_01 List widget example
 *
 * This code places a single Elementary list widgets on a window, just
 * to exemplify the more simple and common use case: a list will be created
 * and populated with a few items.
 *
 * To keep it simple, we won't show how to customize the list, for this check
 * @ref list_example_02. Also, we won't focus
 * on items management on this example. For an example about this subject,
 * check @ref list_example_03.
 *
 * To add a list widget.
 * @dontinclude list_example_01.c
 * @skipline elm_list_add
 *
 * We are just adding the list, so as you can see, defaults for it are:
 * @li Items are displayed vertically.
 * @li Only one item can be selected.
 * @li The list doesn't bounce.
 *
 * To add items, we are just appending it on a loop, using function
 * elm_list_item_append(), that will be better explained on
 * items management example.
 * @dontinclude list_example_01.c
 * @skipline lbl[]
 * @until };
 * @skipline for
 * @skipline elm_list_item_append
 *
 * After we just want to show the list. But first we need to start the widget.
 * It was done this way to improve widget's performance. So, always remember
 * that:
 * @warning Call elm_list_go before showing the object
 * @skipline elm_list_go
 * @skipline show
 *
 * See the full @ref list_example_01.c "list_example_01.c"
 * code, whose window should look like this picture:
 *
 * @image html screenshots/list_example_01.png
 * @image latex screenshots/list_example_01.eps width=\textwidth
 *
 * @example list_example_01.c
 */

/**
 * @page list_example_02 List widget example
 *
 * This code places a single Elementary list widgets on a window,
 * exemplifying a part of the widget's API.
 *
 * First, we will just create a simple list, as done on @ref list_example_01 :
 * @dontinclude list_example_02.c
 * @skipline lbl
 * @until }
 * @skipline elm_list_add
 * @until elm_list_item_append
 *
 * Now, let's customize this list a bit. First we will display items
 * horizontally:
 * @skipline horizontal_set
 *
 * Then we will choose another list mode. There are four of them, and
 * the default #Elm_List_Mode is #ELM_LIST_SCROLL. Let's set compress mode:
 * @skipline mode_set
 *
 * To enable multiple items selection, we need to enable it, since only one
 * selected item is allowed by default:
 * @skipline elm_list_multi_select_set
 *
 * We are not adding items with callback functions here,
 * since we'll explain it better on  @ref list_example_03. But if the callback
 * need to be called everytime user clicks an item, even if already selected,
 * it's required to enable this behavior:
 * @skipline elm_list_select_mode_set
 *
 * Finally, if a bounce effect is required, or you would like to see
 * scrollbars, it is possible. But, for default theme, list
 * scrollbars will be invisible anyway.
 * @skipline bounce_set
 * @until SCROLLER_POLICY_ON
 *
 * See the full @ref list_example_02.c "list_example_02.c"
 * code, whose window should look like this picture:
 *
 * @image html screenshots/list_example_02.png
 * @image latex screenshots/list_example_02.eps width=\textwidth
 *
 * @example list_example_02.c
 */

/**
 * @page list_example_03 List - Items management
 *
 * This code places an Elementary list widgets on a window,
 * along with some buttons trigerring actions on it (though its API).
 * It covers most of elm_list_item functions.
 *
 * On our @c main function, we are adding a default list with
 * 3 items. We are only setting their labels (second parameter of function
 * elm_list_item_append):
 * @dontinclude list_example_03.c
 * @skipline elm_list_add
 * @until Item 2
 *
 * Next we are adding lots of buttons, each one for a callback function
 * that will realize a task covering part of list items API.
 * Lets check the first one:
 * @skipline elm_button_add
 * @until evas_object_show
 *
 * We are labeling the button with a task description with
 * elm_object_text_set() and setting a callback
 * function evas_object_smart_callback_add().
 * Each callback function will have the signature:
 * <tt> static void _task_cb(void *data, Evas_Object *obj,
 * void *event_info)</tt> with the function name varying for each task.
 *
 * Now let's cover all of them.
 *
 * <b> Prepending an item: </b>
 * @dontinclude list_example_03.c
 * @skipline _prepend_cb
 * @until }
 *
 * The item will be placed on the beginning of the list,
 * i.e. it will be the first one.
 *
 * The first parameter of elm_list_item_prepend() is the list
 * object, that we are receiving as data on our callback function.
 * The second one is a label, the string that will be placed in the center
 * of our item. As we don't wan't icons or callback functions, we can
 * send NULL as third, fourth, fifth and sixth parameters.
 *
 * <b> Appending an item: </b>
 * @dontinclude list_example_03.c
 * @skipline _add_cb
 * @until }
 *
 * Items included with append will be inserted inserted after the last one.
 *
 * <b> Appending an item with icon: </b>
 * @dontinclude list_example_03.c
 * @skipline _add_ic_cb
 * @until }
 *
 * If an icon is required, you can pass it as third parameter on our
 * elm_list_item_append() function. It will be place on the
 * left side of item's label. If an icon is wanted on the right side,
 * it should be passed as fourth parameter.
 *
 * For more details about how to create icons, look for elm_icon examples
 * @ref tutorial_icon.
 *
 * <b> Appending an item with callback function for selected: </b>
 * @dontinclude list_example_03.c
 * @skipline _sel_cb
 * @until }
 * @until }
 *
 * To set a callback function that will be called every time an item is
 * selected, i.e., everytime the list stops with this item in
 * center position, just pass the function as fifth parameter.
 *
 * <b> Appending an item with callback function for selected with data: </b>
 * @dontinclude list_example_03.c
 * @skipline _sel_data_cb
 * @until }
 * @until }
 * @until }
 * @until }
 *
 * If the callback function request an extra data, it can be attached to our
 * item passing a pointer for data as sixth parameter.
 * Our function _sel_data_cb will receive it as <tt> void *data </tt>.
 *
 * If you want to free this data, or handle that the way you need when the
 * item is deleted, set a callback function for that, with
 * elm_object_item_del_cb_set().
 *
 * As you can see we check if @c it is not @c NULL after appending it.
 * If an error happens, we won't try to set a function for it.
 *
 * <b> Deleting an item: </b>
 * @dontinclude list_example_03.c
 * @skipline _del_cb(
 * @until }
 *
 * To delete an item we simple need to call elm_object_item_del() with
 * a pointer for such item.
 *
 * If you need, you can get selected item with
 * elm_list_selected_item_get(), that will return a pointer for it.
 *
 * <b> Unselecting an item: </b>
 * @dontinclude list_example_03.c
 * @skipline _unselect_cb
 * @until }
 *
 * To select an item, you should call elm_list_item_selected_set()
 * passing @c EINA_TRUE, and to unselect it, @c EINA_FALSE.
 *
 * <b> Printing all items: </b>
 * @dontinclude list_example_03.c
 * @skipline _print_cb
 * @until }
 *
 * <b> Clearing the list: </b>
 * @dontinclude list_example_03.c
 * @skipline _clear_cb
 * @until }
 *
 * <b> Selecting the next item: </b>
 * @dontinclude list_example_03.c
 * @skipline _select_next_cb
 * @until }
 *
 * <b> Inserting after an item: </b>
 * @dontinclude list_example_03.c
 * @skipline _insert_after_cb
 * @until }
 *
 * <b> Selecting the previous item: </b>
 * @dontinclude list_example_03.c
 * @skipline _select_prev_cb
 * @until }
 *
 * <b> Inserting before an item: </b>
 * @dontinclude list_example_03.c
 * @skipline _insert_before_cb
 * @until }
 *
 * If a separator is required, just set an item as such:
 * @dontinclude list_example_03.c
 * @skipline _set_separator_cb
 * @until }
 *
 * Also an item can be disabled, and the user won't be allowed to (un)select it:
 * @dontinclude list_example_03.c
 * @skipline _disable_cb
 * @until }
 *
 * See the full @ref list_example_03.c "list_example_03.c"
 * code, whose window should look like this picture:
 *
 * @image html screenshots/list_example_03.png
 * @image latex screenshots/list_example_03.eps width=\textwidth
 *
 * @example list_example_03.c
 */

/**
 * @page toolbar_example_01 Toolbar Example - Simple Items
 *
 * This code places an Elementary toolbar widget on a window,
 * to exemplify part of the widget's API.
 *
 * Let's start adding a button to our window, that will have its text
 * modified depending on which item is selected. It's used just to exemplify
 * how to change a window content from the toolbar.
 * @dontinclude toolbar_example_01.c
 * @skipline elm_button_add
 * @until evas_object_show
 *
 * Also, we'll need a toolbar widget, obviously:
 * @skipline elm_toolbar_add
 * @until evas_object_show
 *
 * When appending an item is possible to set an icon, label, and a callback
 * function that will receive passed data.
 * @skipline _item_append
 * @until Folder
 *
 * It's possible to disable items, so the user can't select then. We will
 * disable the third item:
 * @skipline _item_append
 * @until disable
 *
 * Our callbacks will just set button's label:
 * @dontinclude toolbar_example_01.c
 * @skip static
 * @skip }
 * @skipline static
 * @until }
 * @until }
 * @until }
 *
 * By default, toolbars would display items homogeneously, so item with
 * long labels, like the third, will make all of them occupy a lot of space.
 * To avoid that, we can disable it:
 * @dontinclude toolbar_example_01.c
 * @skipline homogeneous
 *
 * Another default behavior, is to add an menu item if we have more items
 * that would fit on toolbar size. To simply enable scroll, without menus,
 * it's required to change toolbar's shrink mode:
 * @dontinclude toolbar_example_01.c
 * @skipline shrink
 *
 * See @ref toolbar_example_01.c "toolbar_example_01.c", whose window should
 * look like this picture:
 *
 * @image html screenshots/toolbar_example_01.png
 * @image latex screenshots/toolbar_example_01.eps width=\textwidth
 *
 * @example toolbar_example_01.c
 */

/**
 * @page toolbar_example_02 Toolbar Example - Items with States
 *
 * This code places an Elementary toolbar widget on a window,
 * to exemplify part of the widget's API.
 *
 * Toolbar widgets has support to items with states. Each state
 * can have it's own label, icon, and callback function.
 *
 * Let's start populating a toolbar with some regular items.
 * If you don't know how to do that, see
 * @ref toolbar_example_01 "Toolbar Example 1".
 * @dontinclude toolbar_example_02.c
 * @skipline elm_toolbar_add
 * @until Update
 *
 * The only difference here is that we set shrink mode to #ELM_TOOLBAR_SHRINK_HIDE,
 * that won't display items that doesn't fit to the window.
 *
 * Now, let's add an item with states. First, add the item just as any other.
 * @skipline elm_toolbar_item_append
 * @until _item_pressed
 *
 * After that states can be added to this item:
 * @skipline state_add
 * @until Full
 * @until _item_pressed
 *
 * The both states and the item are using the same callback function,
 * that will cycle between states and unselect the item. Unseleting
 * is required because it won't call the callback if an user clicks
 * over an item already selected:
 * @dontinclude toolbar_example_02.c
 * @skip static
 * @skip }
 * @skipline static
 * @until }
 *
 * On our example, some items are hidden
 * because we set the window to be small. But if an item should be displayed
 * anyway, is needed to set its priority to be higher than others.
 * Any positive value will be enough in our case. Let's force the item
 * with multiple states to be displayed.
 * @skipline priority
 *
 * See @ref toolbar_example_02.c "toolbar_example_02.c", whose window should
 * look like this picture:
 *
 * @image html screenshots/toolbar_example_02.png
 * @image latex screenshots/toolbar_example_02.eps width=\textwidth
 *
 * @example toolbar_example_02.c
 */

/**
 * @page toolbar_example_03 Toolbar Example - Items with Menus
 *
 * Toolbar widgets have support to items with menus. This kind
 * of item will display a menu when selected by the user.
 *
 * Let's start populating a toolbar with some regular items, the same
 * way we started @ref toolbar_example_02 "Toolbar Example 2".
 * @dontinclude toolbar_example_03.c
 * @skipline elm_toolbar_add
 * @until Update
 *
 * The only difference is that we'll keep the default shrink mode, that
 * adds an item with a menu of hidden items.
 *
 * So, a important thing to do is to set a parent for toolbar menus, or they
 * will use the toolbar as parent, and its size will be restricted to that.
 * @skipline parent_set
 *
 * Not only items' menus will respect this parent, but also the own toolbar
 * menu, used to show hidden items.
 *
 * Next, let's add an item set to display a menu:
 * @skipline elm_toolbar_item_append
 * @until _menu_set
 *
 * Now, to add two options to this item, we can get the menu object and use
 * it as a regular elm_menu. See @ref tutorial_menu "Menu example" for more
 * about menu widget.
 * @skipline _menu_get
 * @until Full
 *
 * See @ref toolbar_example_03.c "toolbar_example_03.c", whose window should
 * look like this picture:
 *
 * @image html screenshots/toolbar_example_03.png
 * @image latex screenshots/toolbar_example_03.eps width=\textwidth
 *
 * @example toolbar_example_03.c
 */

/**
 * @page segment_control_example Segment Control Example
 *
 * This code places an Elementary segment control widgets on a window,
 * to exemplify part of the widget's API.
 *
 * Let's start adding a segment control to our window:
 * @dontinclude segment_control_example.c
 * @skipline elm_segment_control_add
 * @until evas_object_show
 *
 * Now will add an item only with label:
 * @skipline item_add
 *
 * Really simple. To add an item with only an icon, the icon needs to be created
 * first, them added with this same function:
 * @skipline icon_add
 * @until item_add
 *
 * If an item with label and icon is required, it can be done as well. In this
 * case, instead of a label (or icon) centered, the item will display an icon
 * at left and the label at right:
 * @skipline icon_add
 * @until item_add
 *
 * But, if you need to add some items that can have or not a label, but
 * want that all of them looks the same way, with icon at left, just add
 * an empty string label. It's done on our example to illustrate that:
 * @skipline icon_add
 * @until item_add
 *
 * So far, all the item were added to the last position of the widget,
 * but if something different is required, it can be done using another
 * insertion function. Let's suppose we want to put an item just before
 * the last item:
 * @skipline count
 * @until insert_at
 *
 * There are two ways to delete items. Using the item handle, like:
 * @skipline insert_at
 * @until del
 *
 * Or using item's index:
 * @skipline insert_at
 * @until del_at
 *
 * To set properties of an item already added to the widget, you just need
 * to get the item and set icon or label, as the following code shows:
 * @skipline item_get
 * @until label_set
 *
 * Finally, it's possible to select an item from the code, and also get
 * the selected item. We will select the item at the center of the widget
 * and print its position.
 * @skipline count_get
 * @until printf
 *
 * See the full @ref segment_control_example.c "example", whose window should
 * look like this picture:
 *
 * @image html screenshots/segment_control_example.png
 * @image latex screenshots/segment_control_example.eps width=\textwidth
 *
 * @example segment_control_example.c
 */

/**
 * @page flipselector_example Flip selector widget example
 *
 * This code places an Elementary flip selector widget on a window,
 * along with two buttons trigerring actions on it (though its API).
 *
 * The selector is being populated with the following items:
 * @dontinclude flipselector_example.c
 * @skip lbl[]
 * @until ;
 *
 * Next, we create it, populating it with those items and registering
 * two (smart) callbacks on it:
 * @dontinclude flipselector_example.c
 * @skip fp = elm_flipselector_add
 * @until object_show
 *
 * Those two callbacks will take place whenever one of those smart
 * events occur, and they will just print something to @c stdout:
 * @dontinclude flipselector_example.c
 * @skip underflow callback
 * @until }
 * @until }
 * Flip the sheets on the widget while looking at the items list, in
 * the source code, and you'll get the idea of those events.
 *
 * The two buttons below the flip selector will take the actions
 * described in their labels:
 * @dontinclude flipselector_example.c
 * @skip bt = elm_button_add
 * @until callback_add(win
 *
 * @dontinclude flipselector_example.c
 * @skip unselect the item
 * @until }
 * @until }
 *
 * Click on them to exercise those flip selector API calls. To
 * interact with the other parts of this API, there's a command line
 * interface, whose help string can be asked for with the 'h' key:
 * @dontinclude flipselector_example.c
 * @skip commands
 * @until ;
 *
 * The 'n' and 'p' keys will exemplify elm_flipselector_flip_next()
 * and elm_flipselector_flip_prev(), respectively. 'f' and 'l' account
 * for elm_flipselector_first_item_get() and
 * elm_flipselector_last_item_get(), respectively. Finally, 's' will
 * issue elm_flipselector_selected_item_get() on our example flip
 * selector widget.
 *
 * See the full @ref flipselector_example.c "example", whose window should
 * look like this picture:
 *
 * @image html screenshots/flipselector_example.png
 * @image latex screenshots/flipselector_example.eps width=\textwidth
 *
 * See the full @ref flipselector_example_c "source code" for this example.
 *
 */

/**
 * @page fileselector_example File selector widget example
 *
 * This code places two Elementary file selector widgets on a window.
 * The one on the left is layouting file system items in a @b list,
 * while the the other is layouting them in a @b grid.
 *
 * The one having the majority of hooks of interest is on the left,
 * which we create as follows:
 * @dontinclude fileselector_example.c
 * @skip first file selector
 * @until object_show
 *
 * Note that we enable custom edition of file/directory selection, via
 * the text entry it has on its bottom, via
 * elm_fileselector_is_save_set(). It starts with the list view, which
 * is the default, and we make it not expandable in place
 * (elm_fileselector_expandable_set()), so that it replaces its view's
 * contents with the current directory's entries each time one
 * navigates to a different folder.  For both of file selectors we are
 * starting to list the contents found in the @c "/tmp" directory
 * (elm_fileselector_path_set()).
 *
 * Note the code setting it to "grid mode" and observe the differences
 * in the file selector's views, in the example. We also hide the
 * second file selector's Ok/Cancel buttons -- since it's there just
 * to show the grid view (and navigation) -- via
 * elm_fileselector_buttons_ok_cancel_set().
 *
 * The @c "done" event, which triggers the callback below
 * @dontinclude fileselector_example.c
 * @skip 'done' cb
 * @until }
 * will be called at the time one clicks the "Ok"/"Cancel" buttons of
 * the file selector (on the left). Note that it will print the path
 * to the current selection, if any.
 *
 * The @c "selected" event, which triggers the callback below
 * @dontinclude fileselector_example.c
 * @skip bt = 'selected' cb
 * @until }
 * takes place when one selects a file (if the file selector is @b not
 * under folders-only mode) or when one selects a folder (when in
 * folders-only mode). Experiment it by selecting different file
 * system entries.
 *
 * What comes next is the code creating the three check boxes and two
 * buttons below the file selector in the right. They will exercise a
 * bunch of functions on the file selector's API, for the instance on
 * the left. Experiment with them, specially the buttons, to get the
 * difference between elm_fileselector_path_get() and
 * elm_fileselector_selected_get().
 *
 * Finally, there's the code adding the second file selector, on the
 * right:
 * @dontinclude fileselector_example.c
 * @skip second file selector
 * @until object_show
 *
 * Pay attention to the code setting it to "grid mode" and observe the
 * differences in the file selector's views, in the example. We also
 * hide the second file selector's Ok/Cancel buttons -- since it's
 * there just to show the grid view (and navigation) -- via
 * elm_fileselector_buttons_ok_cancel_set().
 *
 * See the full @ref fileselector_example.c "example", whose window
 * should look like this picture:
 *
 * @image html screenshots/fileselector_example.png
 * @image latex screenshots/fileselector_example.eps width=\textwidth
 *
 * See the full @ref fileselector_example_c "source code" for this example.
 *
 */

/**
 * @page fileselector_button_example File selector button widget example
 *
 * This code places an Elementary file selector button widget on a
 * window, along with some other checkboxes and a text entry. Those
 * are there just as knobs on the file selector button's state and to
 * display information from it.
 *
 * Here's how we instantiate it:
 * @dontinclude fileselector_button_example.c
 * @skip ic = elm_icon_add
 * @until evas_object_show
 *
 * Note that we set on it both icon and label decorations. It's set to
 * list the contents of the @c "/tmp" directory, too, with
 * elm_fileselector_button_path_set(). What follows are checkboxes to
 * exercise some of its API funtions:
 * @dontinclude fileselector_button_example.c
 * @skip ck = elm_check_add
 * @until evas_object_show(en)
 *
 * The checkboxes will toggle whether the file selector button's
 * internal file selector:
 * - must have an editable text entry for file names (thus, be in
 *   "save dialog mode")
 * - is to be raised as an "inner window" (note it's the default
 *   behavior) or as a dedicated window
 * - is to populate its view with folders only
 * - is to expand its folders, in its view, <b>in place</b>, and not
 *   repainting it entirely just with the contents of a sole
 *   directory.
 *
 * The entry labeled @c "Last selection" will exercise the @c
 * "file,chosen" smart event coming from the file selector button:
 * @dontinclude fileselector_button_example.c
 * @skip hook on the
 * @until toggle inwin
 *
 * Whenever you dismiss or acknowledges the file selector, after it's
 * raised, the @c event_info string will contain the last selection on
 * it (if any was made).
 *
 * This is how the example, just after called, should look like:
 *
 * @image html screenshots/fileselector_button_example_00.png
 * @image latex screenshots/fileselector_button_example_00.eps width=\textwidth
 *
 * Click on the file selector button to raise its internal file
 * selector, which will be contained on an <b>"inner window"</b>:
 *
 * @image html screenshots/fileselector_button_example_01.png
 * @image latex screenshots/fileselector_button_example_01.eps width=\textwidth
 *
 * Toggle the "inwin mode" switch off and, if you click on the file
 * selector button again, you'll get @b two windows, the original one
 * (note the last selection there!)
 *
 * @image html screenshots/fileselector_button_example_02.png
 * @image latex screenshots/fileselector_button_example_02.eps width=\textwidth
 *
 * and the file selector's new one
 *
 * @image html screenshots/fileselector_button_example_03.png
 * @image latex screenshots/fileselector_button_example_03.eps width=\textwidth
 *
 * Play with the checkboxes to get the behavior changes on the file
 * selector button. The respective API calls on the widget coming from
 * those knobs where shown in the code already.
 *
 * See the full @ref fileselector_button_example_c "source code" for
 * this example.
 *
 */

/**
 * @page fileselector_entry_example File selector entry widget example
 *
 * This code places an Elementary file selector entry widget on a
 * window, along with some other checkboxes. Those are there just as
 * knobs on the file selector entry's state.
 *
 * Here's how we instantiate it:
 * @dontinclude fileselector_entry_example.c
 * @skip ic = elm_icon_add
 * @until evas_object_show
 *
 * Note that we set on it's button both icon and label
 * decorations. It's set to exhibit the path of (and list the contents
 * of, when internal file selector is launched) the @c "/tmp"
 * directory, also, with elm_fileselector_entry_path_set(). What
 * follows are checkboxes to exercise some of its API funtions:
 * @dontinclude fileselector_entry_example.c
 * @skip ck = elm_check_add
 * @until callback_add(fs_entry
 *
 * The checkboxes will toggle whether the file selector entry's
 * internal file selector:
 * - must have an editable text entry for file names (thus, be in
 *   "save dialog mode")
 * - is to be raised as an "inner window" (note it's the default
 *   behavior) or as a dedicated window
 * - is to populate its view with folders only
 * - is to expand its folders, in its view, <b>in place</b>, and not
 *   repainting it entirely just with the contents of a sole
 *   directory.
 *
 * Observe how the entry's text will match the string coming from the
 * @c "file,chosen" smart event:
 * @dontinclude fileselector_entry_example.c
 * @skip hook on the
 * @until }
 * Whenever you dismiss or acknowledges the file selector, after it's
 * raised, the @c event_info string will contain the last selection on
 * it (if any was made).
 *
 * Try, also, to type in a valid system path and, then, open the file
 * selector's window: it will start the file browsing there, for you.
 *
 * This is how the example, just after called, should look like:
 *
 * @image html screenshots/fileselector_entry_example_00.png
 * @image latex screenshots/fileselector_entry_example_00.eps width=\textwidth
 *
 * Click on the file selector entry to raise its internal file
 * selector, which will be contained on an <b>"inner window"</b>:
 *
 * @image html screenshots/fileselector_entry_example_01.png
 * @image latex screenshots/fileselector_entry_example_01.eps width=\textwidth
 *