forked from enlightenment/efl
153 lines
5.4 KiB
Plaintext
153 lines
5.4 KiB
Plaintext
/**
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* @page Examples Examples
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*
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* Here is a page with examples.
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*
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* @li @ref Example_Edje_Basics
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* @li @ref tutorial_edje_swallow
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*/
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/**
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* @page Example_Edje_Basics Edje basics example
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*
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* In this example, we illustrate how to start using the Edje library,
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* with the very basic one needs to instantiate an Edje object.
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*
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* We place, in the canvas, an Edje object along with a @b red border
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* image to delimit its geometry. After we instantiate the Edje
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* object, we @b have to set a file and a group, within that file, to
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* bind to it. For this example, we're using an EDC file which
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* declares two parts (blue and green rectangles) and an item data:
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* @include basic.edc
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*
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* We start by trying to acces an @b unexistant group in the file, so
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* that you can see the usefulness of edje_object_load_error_get() and
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* edje_load_error_str(). Check that the error message will tell you
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* just that -- a group which didn't exist in the file was called for:
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* @dontinclude edje-basic.c
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* @skip file_path
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* @until file_path
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* @dontinclude edje-basic.c
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* @skip edje_object_add
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* @until }
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*
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* Than, we finally bind our Edje object to @c "example_group",
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* printing a message afterwards:
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* @dontinclude edje-basic.c
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* @skip file_path, "example_group"
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* @until object_show
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*
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* What follows is a series of Edje API calls which are of general
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* use. The first of them is edje_object_data_get(), which we use to
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* get the value we have put in the @c "example_data" data field, in
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* our EDC object declaration:
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* @dontinclude edje-basic.c
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* @skip data field in group
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* @until ;
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*
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* Than, we exemplify edje_object_part_exists():
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* @dontinclude edje-basic.c
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* @skip Testing if
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* @until ;
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*
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* The next call is to query @c "part_one"'s geometry, relative to the
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* whole Edje object's area. The part will be situated in the middle
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* of the Edje object's, because it has a restricted forced size (we
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* set its minimum size equal to its maximum, for that) and, by
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* default, parts are aligned to the center of their containers:
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* @dontinclude edje-basic.c
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* @skip part_geometry_get
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* @until x, y, w, h
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*
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* We can grab a direct pointer on the rectangle implementing @c
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* "part_one", by using edje_object_part_object_get(). Since we are
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* not allowed to set properties on it, we just check its color, to
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* assure its really blue, as declared in the EDC:
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* @dontinclude edje-basic.c
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* @skip color_get
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* @until x, y, w, h
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*
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* The @c "min" and @c "max" EDC properties can be queried with the
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* following calls:
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* @dontinclude edje-basic.c
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* @skip max_get
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* @until min. size is
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*
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* The next two calls are to make <b>size calculations</b> on our
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* object. Because of the minumim size declared for @c "part_one" part's
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* default state description, that will be our exact minimum
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* size calculated for the group (remember the @c "min" declaration at
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* group level is just a @b hint, not an enforcement). We then
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* exercise the edje_object_size_min_restricted_calc() function,
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* passing a minimum size of 500, in each axis. Since we have @b no
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* object bigger than that, it will be the minimum size calculated, in
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* the end:
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* @dontinclude edje-basic.c
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* @skip min_calc
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* @until size calculation is
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*
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* @c "part_two" part is there with a purpose: since it extrapolates
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* the Edje object's boundaries, the edje_object_parts_extends_calc()
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* function will report origin coordinates for the rectangle grouping
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* both parts with @b negative values, indicating it extrapolates to
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* the upper left of our group, just as we see it.
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*
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* To interact with the last features exemplified in the program,
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* there's a command line interface. A help string can be asked for
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* with the 'h' key:
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* @dontinclude edje-basic.c
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* @skip commands
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* @until ;
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*
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* Those commands will change the scaling factors of our Edje objects.
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* The first of them, @c 's', will change Edje's @b global scaling
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* factor between @c 1.0 (no scaling) and @c 2.0 (double
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* scale). Scaling will be applied to @c "part_one", only, because
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* that's the part flagged to be scaled at EDC level:
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* @dontinclude edje-basic.c
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* @skip strcmp(ev->keyname, "s") == 0
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* @until }
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*
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* Note, finally, that the @c 's' command will depend on the 'r' one
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* to have its effects applied. The latter will change @c "part_one"'s
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* @b individual scaling factor, which @b overrides Edje's global
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* scaling factor. Only when the individual one is set to zero, will
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* the global one take effect:
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* @dontinclude edje-basic.c
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* @skip strcmp(ev->keyname, "r") == 0
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* @until }
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*
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* The example's window should look like this picture:
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*
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* @image html edje-basics-example.png
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* @image rtf edje-basics-example.png
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* @image latex edje-basics-example.eps
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*
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* The full example follows.
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*
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* @include edje-basic.c
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* @example edje-basic.c
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*/
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/**
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* @page tutorial_edje_swallow Swallow example
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* @dontinclude edje-swallow.c
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*
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* This is a simple example in which we create a rect and swallow it.
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*
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* Focusing on the relevant parts of the code we go right to the creation of our
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* rectangle. It should be noted that we don't resize or show our rect, that is
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* because when an object is swallowed it's geometry and visibility is
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* controlled by the theme:
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* @skip 20
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* @skipline evas_object_rectangle_add
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* @until swallow
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*
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* The other bit of code that is relevant to us now is our check that the
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* swallow worked:
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* @until printf
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*
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* The full source code follows:
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* @include edje-swallow.c
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* @example edje-swallow.c
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*/ |