408 lines
22 KiB
C
408 lines
22 KiB
C
/**
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* @defgroup Elm_Genlist Genlist (Generic list)
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* @ingroup Elementary
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*
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* @image html genlist_inheritance_tree.png
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* @image latex genlist_inheritance_tree.eps
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*
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* @image html img/genlist.png
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* @image latex img/genlist.eps
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*
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* This widget aims to have more expansive list than the simple list in
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* Elementary that could have more flexible items and allow many more entries
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* while still being fast and low on memory usage. At the same time it was
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* also made to be able to do tree structures. But the price to pay is more
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* complexity when it comes to usage. If all you want is a simple list with
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* icons and a single text, use the normal @ref List object.
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*
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* Genlist has a fairly large API, mostly because it's relatively complex,
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* trying to be both expansive, powerful and efficient. First we will begin
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* an overview on the theory behind genlist.
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*
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* This widget inherits from the @ref Layout one, so that all the
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* functions acting on it also work for genlist objects.
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*
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* This widget implements the @b @ref elm-scrollable-interface
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* interface, so that all (non-deprecated) functions for the base @ref
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* Scroller widget also work for genlists.
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*
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* Some calls on the genlist's API are marked as @b deprecated, as
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* they just wrap the scrollable widgets counterpart functions. Use
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* the ones we point you to, for each case of deprecation here,
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* instead -- eventually the deprecated ones will be discarded (next
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* major release).
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*
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* @section Genlist_Item_Class Genlist item classes - creating items
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*
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* In order to have the ability to add and delete items on the fly, genlist
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* implements a class (callback) system where the application provides a
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* structure with information about that type of item (genlist may contain
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* multiple different items with different classes, states and styles).
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* Genlist will call the functions in this struct (methods) when an item is
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* "realized" (i.e., created dynamically, while the user is scrolling the
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* list). All objects will simply be deleted when no longer needed with
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* evas_object_del(). The #Elm_Genlist_Item_Class structure contains the
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* following members:
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* - @c item_style - This is a constant string and simply defines the name
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* of the item style. It @b must be specified and the default should be @c
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* "default".
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* - @c decorate_item_style - This is a constant string and simply defines the name
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* of the decorate mode item style. It is used to specify decorate mode item style. It can be
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* used when you call elm_genlist_item_decorate_mode_set().
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* - @c decorate_all_item_style - This is a constant string and simply defines the name
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* of the decorate all item style. It is used to specify decorate all item style. It can be
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* used to set selection, checking and deletion mode. This is used when you
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* call elm_genlist_decorate_mode_set().
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* - @c func - A struct with pointers to functions that will be called when
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* an item is going to be actually created. All of them receive a @c data
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* parameter that will point to the same data passed to
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* elm_genlist_item_append() and related item creation functions, and an @c
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* obj parameter that points to the genlist object itself.
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*
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* The function pointers inside @c func are @c text_get, @c content_get, @c
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* state_get and @c del. The 3 first functions also receive a @c part
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* parameter described below. A brief description of these functions follows:
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*
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* - @c text_get - The @c part parameter is the name string of one of the
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* existing text parts in the Edje group implementing the item's theme.
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* This function @b must return a strdup'()ed string, as the caller will
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* free() it when done. See #Elm_Genlist_Item_Text_Get_Cb.
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* - @c content_get - The @c part parameter is the name string of one of the
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* existing (content) swallow parts in the Edje group implementing the item's
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* theme. It must return @c NULL, when no content is desired, or a valid
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* object handle, otherwise. The object will be deleted by the genlist on
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* its deletion or when the item is "unrealized".
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* See #Elm_Genlist_Item_Content_Get_Cb.
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* - @c func.state_get - The @c part parameter is the name string of one of
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* the state parts in the Edje group implementing the item's theme. Return
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* @c EINA_FALSE for false/off or @c EINA_TRUE for true/on. Genlists will
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* emit a signal to its theming Edje object with @c "elm,state,xxx,active"
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* and @c "elm" as "emission" and "source" arguments, respectively, when
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* the state is true (the default is false), where @c xxx is the name of
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* the (state) part. See #Elm_Genlist_Item_State_Get_Cb.
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* - @c func.del - This is intended for use when genlist items are deleted,
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* so any data attached to the item (e.g. its data parameter on creation)
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* can be deleted. See #Elm_Genlist_Item_Del_Cb.
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*
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* available item styles:
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* - default
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* - default_style - The text part is a textblock
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* - double_label
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* - icon_top_text_bottom
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* - group_index
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* - one_icon - Only 1 icon (left) (since 1.7)
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* - end_icon - Only 1 icon (at end/right) (since 1.7)
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* - no_icon - No icon (at end/right) (since 1.7)
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* - full - Only 1 icon, elm.swallow.content, which consumes whole area of
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* genlist item (since 1.7)
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*
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* If one wants to use more icons and texts than are offered in theme, there
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* are two solutions. One is to use 'full' style that has one big swallow part.
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* You can swallow anything there. The other solution is to customize genlist
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* item style in application side by using elm_theme_extension_add() and its
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* own edc. Please refer @ref theme_example_01 for that.
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*
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* @section Genlist_Items Structure of items
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*
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* An item in a genlist can have 0 or more texts (they can be regular
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* text or textblock Evas objects - that's up to the style to determine), 0
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* or more contents (which are simply objects swallowed into the genlist item's
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* theming Edje object) and 0 or more <b>boolean states</b>, which have the
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* behavior left to the user to define. The Edje part names for each of
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* these properties will be looked up, in the theme file for the genlist,
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* under the Edje (string) data items named @c "labels", @c "contents" and @c
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* "states", respectively. For each of those properties, if more than one
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* part is provided, they must have names listed separated by spaces in the
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* data fields. For the default genlist item theme, we have @b one text
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* part (@c "elm.text"), @b two content parts (@c "elm.swallow.icon" and @c
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* "elm.swallow.end") and @b no state parts.
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*
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* A genlist item may be at one of several styles. Elementary provides one
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* by default - "default", but this can be extended by system or application
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* custom themes/overlays/extensions (see @ref Theme "themes" for more
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* details).
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*
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* @section Genlist_Manipulation Editing and Navigating
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*
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* Items can be added by several calls. All of them return a @ref
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* Elm_Object_Item handle that is an internal member inside the genlist.
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* They all take a data parameter that is meant to be used for a handle to
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* the applications internal data (eg. the struct with the original item
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* data). The parent parameter is the parent genlist item this belongs to if
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* it is a tree or an indexed group, and NULL if there is no parent. The
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* flags can be a bitmask of #ELM_GENLIST_ITEM_NONE, #ELM_GENLIST_ITEM_TREE
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* and #ELM_GENLIST_ITEM_GROUP. If #ELM_GENLIST_ITEM_TREE is set then this
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* item is displayed as an item that is able to expand and have child items.
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* If #ELM_GENLIST_ITEM_GROUP is set then this item is group index item that
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* is displayed at the top until the next group comes. The func parameter is
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* a convenience callback that is called when the item is selected and the
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* data parameter will be the func_data parameter, @c obj be the genlist
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* object and event_info will be the genlist item.
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*
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* elm_genlist_item_append() adds an item to the end of the list, or if
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* there is a parent, to the end of all the child items of the parent.
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* elm_genlist_item_prepend() is the same but adds to the beginning of
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* the list or children list. elm_genlist_item_insert_before() inserts at
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* item before another item and elm_genlist_item_insert_after() inserts after
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* the indicated item.
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*
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* The application can clear the list with elm_genlist_clear() which deletes
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* all the items in the list and elm_object_item_del() will delete a specific
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* item. elm_genlist_item_subitems_clear() will clear all items that are
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* children of the indicated parent item.
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*
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* To help inspect list items you can jump to the item at the top of the list
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* with elm_genlist_first_item_get() which will return the item pointer, and
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* similarly elm_genlist_last_item_get() gets the item at the end of the list.
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* elm_genlist_item_next_get() and elm_genlist_item_prev_get() get the next
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* and previous items respectively relative to the indicated item. Using
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* these calls you can walk the entire item list/tree. Note that as a tree
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* the items are flattened in the list, so elm_genlist_item_parent_get() will
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* let you know which item is the parent (and thus know how to skip them if
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* wanted).
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*
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* @section Genlist_Multi_Selection Multi-selection
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*
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* If the application wants multiple items to be able to be selected,
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* elm_genlist_multi_select_set() can enable this. If the list is
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* single-selection only (the default), then elm_genlist_selected_item_get()
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* will return the selected item, if any, or NULL if none is selected. If the
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* list is multi-select then elm_genlist_selected_items_get() will return a
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* list (that is only valid as long as no items are modified (added, deleted,
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* selected or unselected)).
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*
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* @section Genlist_Usage_Hints Usage hints
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*
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* There are also convenience functions. elm_object_item_widget_get() will
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* return the genlist object the item belongs to. elm_genlist_item_show()
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* will make the scroller scroll to show that specific item so its visible.
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* elm_object_item_data_get() returns the data pointer set by the item
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* creation functions.
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*
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* If an item changes (state of boolean changes, text or contents change),
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* then use elm_genlist_item_update() to have genlist update the item with
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* the new state. Genlist will re-realize the item and thus call the functions
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* in the _Elm_Genlist_Item_Class for that item.
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*
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* To programmatically (un)select an item use elm_genlist_item_selected_set().
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* To get its selected state use elm_genlist_item_selected_get(). Similarly
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* to expand/contract an item and get its expanded state, use
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* elm_genlist_item_expanded_set() and elm_genlist_item_expanded_get(). And
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* again to make an item disabled (unable to be selected and appear
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* differently) use elm_object_item_disabled_set() to set this and
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* elm_object_item_disabled_get() to get the disabled state.
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*
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* In general to indicate how the genlist should expand items horizontally to
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* fill the list area, use elm_genlist_mode_set(). Valid modes are
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* ELM_LIST_LIMIT, ELM_LIST_COMPRESS and ELM_LIST_SCROLL. The default is
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* ELM_LIST_SCROLL. This mode means that if items are too wide to fit, the
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* scroller will scroll horizontally. Otherwise items are expanded to
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* fill the width of the viewport of the scroller. If it is
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* ELM_LIST_LIMIT, items will be expanded to the viewport width
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* if larger than the item, but genlist widget width is
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* limited to the largest item. Do not use ELM_LIST_LIMIT mode with homogeneous
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* mode turned on. ELM_LIST_COMPRESS can be combined with a different style
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* that uses edjes' ellipsis feature (cutting text off like this: "tex...").
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*
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* Items will call their selection func and callback only once when first becoming
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* selected. Any further clicks will do nothing, unless you enable always
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* select with elm_genlist_select_mode_set() as ELM_OBJECT_SELECT_MODE_ALWAYS.
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* This means even if selected, every click will make the selected callbacks
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* be called. elm_genlist_select_mode_set() as ELM_OBJECT_SELECT_MODE_NONE will
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* turn off the ability to select items entirely and they will neither
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* appear selected nor call selected callback functions.
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*
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* Remember that you can create new styles and add your own theme augmentation
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* per application with elm_theme_extension_add(). If you absolutely must
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* have a specific style that overrides any theme the user or system sets up
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* you can use elm_theme_overlay_add() to add such a file.
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*
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* @section Genlist_Implementation Implementation
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*
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* Evas tracks every object you create. Every time it processes an event
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* (mouse move, down, up etc.) it needs to walk through objects and find out
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* what event that affects. Even worse every time it renders display updates,
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* in order to just calculate what to re-draw, it needs to walk through many
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* many many objects. Thus, the more objects you keep active, the more
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* overhead Evas has in just doing its work. It is advisable to keep your
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* active objects to the minimum working set you need. Also remember that
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* object creation and deletion carries an overhead, so there is a
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* middle-ground, which is not easily determined. But don't keep massive lists
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* of objects you can't see or use. Genlist does this with list objects. It
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* creates and destroys them dynamically as you scroll around. It groups them
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* into blocks so it can determine the visibility etc. of a whole block at
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* once as opposed to having to walk the whole list. This 2-level list allows
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* for very large numbers of items to be in the list (tests have used up to
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* 2,000,000 items). Also genlist employs a queue for adding items. As items
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* may be different sizes, every item added needs to be calculated as to its
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* size and thus this presents a lot of overhead on populating the list, this
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* genlist employs a queue. Any item added is queued and spooled off over
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* time, actually appearing some time later, so if your list has many members
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* you may find it takes a while for them to all appear, with your process
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* consuming a lot of CPU while it is busy spooling.
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*
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* Genlist also implements a tree structure for items, but it does so with
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* callbacks to the application, with the application filling in tree
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* structures when requested (allowing for efficient building of a very
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* deep tree that could even be used for file-management).
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* See the above smart signal callbacks for details.
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*
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* @section Genlist_Smart_Events Genlist smart events
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*
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* This widget emits the following signals, besides the ones sent from
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* @ref Layout:
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* - @c "activated" - The user has double-clicked or pressed
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* (enter|return|spacebar) on an item. The @p event_info parameter is the
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* item that was activated.
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* - @c "pressed" - The user pressed an item. The @p event_info
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* parameter is the item that was pressed.
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* - @c "released" - The user released an item. The @p event_info
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* parameter is the item that was released.
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* - @c "clicked,double" - The user has double-clicked an item. The @c
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* event_info parameter is the item that was double-clicked.
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* - @c "clicked,right" - The user has right-clicked an item. The @c
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* event_info parameter is the item that was right-clicked. (since 1.13)
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* - @c "selected" - This is called when a user has made an item selected.
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* The event_info parameter is the genlist item that was selected.
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* - @c "unselected" - This is called when a user has made an item
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* unselected. The event_info parameter is the genlist item that was
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* unselected.
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* - @c "expanded" - This is called when elm_genlist_item_expanded_set() is
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* called and the item is now meant to be expanded. The event_info
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* parameter is the genlist item that was indicated to expand. It is the
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* job of this callback to then fill in the child items.
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* - @c "contracted" - This is called when elm_genlist_item_expanded_set() is
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* called and the item is now meant to be contracted. The event_info
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* parameter is the genlist item that was indicated to contract. It is the
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* job of this callback to then delete the child items.
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* - @c "expand,request" - This is called when a user has indicated they want
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* to expand a tree branch item. The callback should decide if the item can
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* expand (has any children) and then call elm_genlist_item_expanded_set()
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* appropriately to set the state. The event_info parameter is the genlist
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* item that was indicated to expand.
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* - @c "contract,request" - This is called when a user has indicated they
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* want to contract a tree branch item. The callback should decide if the
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* item can contract (has any children) and then call
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* elm_genlist_item_expanded_set() appropriately to set the state. The
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* event_info parameter is the genlist item that was indicated to contract.
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* - @c "realized" - This is called when the item in the list is created as a
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* real evas object. event_info parameter is the genlist item that was
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* created.
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* - @c "unrealized" - This is called just before an item is unrealized.
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* After this call content objects provided will be deleted and the item
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* object itself delete or be put into a floating cache.
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* - @c "drag,start,up" - This is called when the item in the list has been
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* dragged (not scrolled) up.
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* - @c "drag,start,down" - This is called when the item in the list has been
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* dragged (not scrolled) down.
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* - @c "drag,start,left" - This is called when the item in the list has been
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* dragged (not scrolled) left.
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* - @c "drag,start,right" - This is called when the item in the list has
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* been dragged (not scrolled) right.
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* - @c "drag,stop" - This is called when the item in the list has stopped
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* being dragged.
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* - @c "drag" - This is called when the item in the list is being dragged.
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* - @c "longpressed" - This is called when the item is pressed for a certain
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* amount of time. By default it's 1 second. The event_info parameter is the
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* longpressed genlist item.
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* - @c "scroll" - the content has been scrolled (moved) (since 1.13)
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* - @c "scroll,anim,start" - This is called when scrolling animation has
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* started.
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* - @c "scroll,anim,stop" - This is called when scrolling animation has
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* stopped.
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* - @c "scroll,drag,start" - This is called when dragging the content has
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* started.
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* - @c "scroll,drag,stop" - This is called when dragging the content has
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* stopped.
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* - @c "edge,top" - This is called when the genlist is scrolled until
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* the top edge.
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* - @c "edge,bottom" - This is called when the genlist is scrolled
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* until the bottom edge.
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* - @c "edge,left" - This is called when the genlist is scrolled
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* until the left edge.
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* - @c "edge,right" - This is called when the genlist is scrolled
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* until the right edge.
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* - @c "multi,swipe,left" - This is called when the genlist is multi-touch
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* swiped left.
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* - @c "multi,swipe,right" - This is called when the genlist is multi-touch
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* swiped right.
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* - @c "multi,swipe,up" - This is called when the genlist is multi-touch
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* swiped up.
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* - @c "multi,swipe,down" - This is called when the genlist is multi-touch
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* swiped down.
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* - @c "multi,pinch,out" - This is called when the genlist is multi-touch
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* pinched out.
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* - @c "multi,pinch,in" - This is called when the genlist is multi-touch
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* pinched in.
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* - @c "swipe" - This is called when the genlist is swiped.
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* - @c "moved" - This is called when a genlist item is moved by a user
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* interaction in a reorder mode. The @p event_info parameter is the item that
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* was moved.
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* - @c "moved,after" - This is called when a genlist item is moved after
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* another item in reorder mode. The event_info parameter is the reordered
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* item. To get the relative previous item, use elm_genlist_item_prev_get().
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* This signal is called along with "moved" signal.
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* - @c "moved,before" - This is called when a genlist item is moved before
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* another item in reorder mode. The event_info parameter is the reordered
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* item. To get the relative previous item, use elm_genlist_item_next_get().
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* This signal is called along with "moved" signal.
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* - @c "index,update" - This is called when a genlist item index is changed.
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* Note that this callback is called while each item is being realized.
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* - @c "language,changed" - This is called when the program's language is
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* changed. Call the elm_genlist_realized_items_update() if items text should
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* be translated.
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* - @c "tree,effect,finished" - This is called when a genlist tree effect is finished.
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* - @c "highlighted" - an item in the list is highlighted. This is called when
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* the user presses an item or keyboard selection is done so the item is
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* physically highlighted. The @p event_info parameter is the item that was
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* highlighted.
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* - @c "unhighlighted" - an item in the list is unhighlighted. This is called
|
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* when the user releases an item or keyboard selection is moved so the item
|
|
* is physically unhighlighted. The @p event_info parameter is the item that
|
|
* was unhighlighted.
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* - @c "focused" - When the genlist has received focus. (since 1.8)
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* - @c "unfocused" - When the genlist has lost focus. (since 1.8)
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* - @c "item,focused" - When the genlist item has received focus. (since 1.10)
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* - @c "item,unfocused" - When the genlist item has lost focus. (since 1.10)
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|
*
|
|
*
|
|
* Supported elm_object_item common APIs
|
|
* @li @ref elm_object_item_part_content_get
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|
* @li @ref elm_object_item_part_text_get
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|
* @li @ref elm_object_item_disabled_set
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|
* @li @ref elm_object_item_disabled_get
|
|
* @li @ref elm_object_item_signal_emit
|
|
*
|
|
* Unsupported elm_object_item common APIs due to the genlist concept.
|
|
* Genlist fills content/text according to the appropriate callback functions.
|
|
* Please use elm_genlist_item_update() or elm_genlist_item_fields_update()
|
|
* instead.
|
|
* @li @ref elm_object_item_part_content_set
|
|
* @li @ref elm_object_item_part_content_unset
|
|
* @li @ref elm_object_item_part_text_set
|
|
*
|
|
* @section Genlist_Examples Examples
|
|
*
|
|
* Here is a list of examples that use the genlist, trying to show some of
|
|
* its capabilities:
|
|
* - @ref genlist_example_01
|
|
* - @ref genlist_example_02
|
|
* - @ref genlist_example_03
|
|
* - @ref genlist_example_04
|
|
* - @ref genlist_example_05
|
|
*/
|
|
|
|
/**
|
|
* @addtogroup Elm_Genlist
|
|
* @{
|
|
*/
|
|
|
|
#include <elm_genlist_common.h>
|
|
#ifndef EFL_NOLEGACY_API_SUPPORT
|
|
#include <elm_genlist_legacy.h>
|
|
#endif
|
|
|
|
/**
|
|
* @}
|
|
*/
|