2 * @defgroup Layout Layout
4 * @image html img/widget/layout/preview-00.png
5 * @image latex img/widget/layout/preview-00.eps width=\textwidth
7 * @image html img/layout-predefined.png
8 * @image latex img/layout-predefined.eps width=\textwidth
10 * This is a container widget that takes a standard Edje design file and
11 * wraps it very thinly in a widget.
13 * An Edje design (theme) file has a very wide range of possibilities to
14 * describe the behavior of elements added to the Layout. Check out the Edje
15 * documentation and the EDC reference to get more information about what can
18 * Just like @ref List, @ref Box, and other container widgets, any
19 * object added to the Layout will become its child, meaning that it will be
20 * deleted if the Layout is deleted, move if the Layout is moved, and so on.
22 * The Layout widget can contain as many Contents, Boxes or Tables as
23 * described in its theme file. For instance, objects can be added to
24 * different Tables by specifying the respective Table part names. The same
25 * is valid for Content and Box.
27 * The objects added as child of the Layout will behave as described in the
28 * part description where they were added. There are 3 possible types of
29 * parts where a child can be added:
31 * @section secContent Content (SWALLOW part)
33 * Only one object can be added to the @c SWALLOW part (but you still can
34 * have many @c SWALLOW parts and one object on each of them). Use the @c
35 * elm_object_content_set/get/unset functions to set, retrieve and unset
36 * objects as content of the @c SWALLOW. After being set to this part, the
37 * object size, position, visibility, clipping and other description
38 * properties will be totally controlled by the description of the given part
39 * (inside the Edje theme file).
41 * One can use @c evas_object_size_hint_* functions on the child to have some
42 * kind of control over its behavior, but the resulting behavior will still
43 * depend heavily on the @c SWALLOW part description.
45 * The Edje theme also can change the part description, based on signals or
46 * scripts running inside the theme. This change can also be animated. All of
47 * this will affect the child object set as content accordingly. The object
48 * size will be changed if the part size is changed, it will animate move if
49 * the part is moving, and so on.
51 * The following picture demonstrates a Layout widget with a child object
52 * added to its @c SWALLOW:
54 * @image html layout_swallow.png
55 * @image latex layout_swallow.eps width=\textwidth
57 * @section secBox Box (BOX part)
59 * An Edje @c BOX part is very similar to the Elementary @ref Box widget. It
60 * allows one to add objects to the box and have them distributed along its
61 * area, accordingly to the specified @a layout property (now by @a layout we
62 * mean the chosen layouting design of the Box, not the Layout widget
65 * A similar effect for having a box with its position, size and other things
66 * controlled by the Layout theme would be to create an Elementary @ref Box
67 * widget and add it as a Content in the @c SWALLOW part.
69 * The main difference of using the Layout Box is that its behavior, the box
70 * properties like layouting format, padding, align, etc. will be all
71 * controlled by the theme. This means, for example, that a signal could be
72 * sent to the Layout theme (with elm_object_signal_emit()) and the theme
73 * handled the signal by changing the box padding, or align, or both. Using
74 * the Elementary @ref Box widget is not necessarily harder or easier, it
75 * just depends on the circunstances and requirements.
77 * The Layout Box can be used through the @c elm_layout_box_* set of
80 * The following picture demonstrates a Layout widget with many child objects
81 * added to its @c BOX part:
83 * @image html layout_box.png
84 * @image latex layout_box.eps width=\textwidth
86 * @section secTable Table (TABLE part)
88 * Just like the @ref secBox, the Layout Table is very similar to the
89 * Elementary @ref Table widget. It allows one to add objects to the Table
90 * specifying the row and column where the object should be added, and any
91 * column or row span if necessary.
93 * Again, we could have this design by adding a @ref Table widget to the @c
94 * SWALLOW part using elm_object_part_content_set(). The same difference happens
95 * here when choosing to use the Layout Table (a @c TABLE part) instead of
96 * the @ref Table plus @c SWALLOW part. It's just a matter of convenience.
98 * The Layout Table can be used through the @c elm_layout_table_* set of
101 * The following picture demonstrates a Layout widget with many child objects
102 * added to its @c TABLE part:
104 * @image html layout_table.png
105 * @image latex layout_table.eps width=\textwidth
107 * @section secPredef Predefined Layouts
109 * Another interesting thing about the Layout widget is that it offers some
110 * predefined themes that come with the default Elementary theme. These
111 * themes can be set by the call elm_layout_theme_set(), and provide some
112 * basic functionality depending on the theme used.
114 * Most of them already send some signals, some already provide a toolbar or
115 * back and next buttons.
117 * These are available predefined theme layouts. All of them have class = @c
118 * layout, group = @c application, and style = one of the following options:
120 * @li @c toolbar-content - application with toolbar and main content area
121 * @li @c toolbar-content-back - application with toolbar and main content
122 * area with a back button and title area
123 * @li @c toolbar-content-back-next - application with toolbar and main
124 * content area with a back and next buttons and title area
125 * @li @c content-back - application with a main content area with a back
126 * button and title area
127 * @li @c content-back-next - application with a main content area with a
128 * back and next buttons and title area
129 * @li @c toolbar-vbox - application with toolbar and main content area as a
131 * @li @c toolbar-table - application with toolbar and main content area as a
134 * @section secExamples Examples
136 * Some examples of the Layout widget can be found here:
137 * @li @ref layout_example_01
138 * @li @ref layout_example_02
139 * @li @ref layout_example_03
140 * @li @ref layout_example_edc
145 * Add a new layout to the parent
147 * @param parent The parent object
148 * @return The new object or NULL if it cannot be created
150 * @see elm_layout_file_set()
151 * @see elm_layout_theme_set()
155 EAPI Evas_Object *elm_layout_add(Evas_Object *parent) EINA_ARG_NONNULL(1);
158 * Set the file that will be used as layout
160 * @param obj The layout object
161 * @param file The path to file (edj) that will be used as layout
162 * @param group The group that the layout belongs in edje file
164 * @return (1 = success, 0 = error)
168 EAPI Eina_Bool elm_layout_file_set(Evas_Object *obj, const char *file, const char *group) EINA_ARG_NONNULL(1);
171 * Set the edje group from the elementary theme that will be used as layout
173 * @param obj The layout object
174 * @param clas the clas of the group
175 * @param group the group
176 * @param style the style to used
178 * @return (1 = success, 0 = error)
182 EAPI Eina_Bool elm_layout_theme_set(Evas_Object *obj, const char *clas, const char *group, const char *style) EINA_ARG_NONNULL(1);
185 * Set the layout content.
187 * @param obj The layout object
188 * @param swallow The swallow part name in the edje file
189 * @param content The child that will be added in this layout object
191 * Once the content object is set, a previously set one will be deleted.
192 * If you want to keep that old content object, use the
193 * elm_object_part_content_unset() function.
195 * @note In an Edje theme, the part used as a content container is called @c
196 * SWALLOW. This is why the parameter name is called @p swallow, but it is
197 * expected to be a part name just like the second parameter of
198 * elm_layout_box_append().
200 * @see elm_layout_box_append()
201 * @see elm_object_part_content_get()
202 * @see elm_object_part_content_unset()
204 * @deprecated use elm_object_part_content_set() instead
208 EINA_DEPRECATED EAPI void elm_layout_content_set(Evas_Object *obj, const char *swallow, Evas_Object *content) EINA_ARG_NONNULL(1);
211 * Get the child object in the given content part.
213 * @param obj The layout object
214 * @param swallow The SWALLOW part to get its content
216 * @return The swallowed object or NULL if none or an error occurred
218 * @deprecated use elm_object_part_content_get() instead
222 EINA_DEPRECATED EAPI Evas_Object *elm_layout_content_get(const Evas_Object *obj, const char *swallow) EINA_ARG_NONNULL(1);
225 * Unset the layout content.
227 * @param obj The layout object
228 * @param swallow The swallow part name in the edje file
229 * @return The content that was being used
231 * Unparent and return the content object which was set for this part.
233 * @deprecated use elm_object_part_content_unset() instead
237 EINA_DEPRECATED EAPI Evas_Object *elm_layout_content_unset(Evas_Object *obj, const char *swallow) EINA_ARG_NONNULL(1);
240 * Set the text of the given part
242 * @param obj The layout object
243 * @param part The TEXT part where to set the text
244 * @param text The text to set
247 * @deprecated use elm_object_part_text_set() instead.
249 EINA_DEPRECATED EAPI void elm_layout_text_set(Evas_Object *obj, const char *part, const char *text) EINA_ARG_NONNULL(1);
252 * Get the text set in the given part
254 * @param obj The layout object
255 * @param part The TEXT part to retrieve the text off
257 * @return The text set in @p part
260 * @deprecated use elm_object_part_text_get() instead.
262 EINA_DEPRECATED EAPI const char *elm_layout_text_get(const Evas_Object *obj, const char *part) EINA_ARG_NONNULL(1);
265 * Append child to layout box part.
267 * @param obj the layout object
268 * @param part the box part to which the object will be appended.
269 * @param child the child object to append to box.
271 * Once the object is appended, it will become child of the layout. Its
272 * lifetime will be bound to the layout, whenever the layout dies the child
273 * will be deleted automatically. One should use elm_layout_box_remove() to
274 * make this layout forget about the object.
276 * @see elm_layout_box_prepend()
277 * @see elm_layout_box_insert_before()
278 * @see elm_layout_box_insert_at()
279 * @see elm_layout_box_remove()
283 EAPI void elm_layout_box_append(Evas_Object *obj, const char *part, Evas_Object *child) EINA_ARG_NONNULL(1);
286 * Prepend child to layout box part.
288 * @param obj the layout object
289 * @param part the box part to prepend.
290 * @param child the child object to prepend to box.
292 * Once the object is prepended, it will become child of the layout. Its
293 * lifetime will be bound to the layout, whenever the layout dies the child
294 * will be deleted automatically. One should use elm_layout_box_remove() to
295 * make this layout forget about the object.
297 * @see elm_layout_box_append()
298 * @see elm_layout_box_insert_before()
299 * @see elm_layout_box_insert_at()
300 * @see elm_layout_box_remove()
304 EAPI void elm_layout_box_prepend(Evas_Object *obj, const char *part, Evas_Object *child) EINA_ARG_NONNULL(1);
307 * Insert child to layout box part before a reference object.
309 * @param obj the layout object
310 * @param part the box part to insert.
311 * @param child the child object to insert into box.
312 * @param reference another reference object to insert before in box.
314 * Once the object is inserted, it will become child of the layout. Its
315 * lifetime will be bound to the layout, whenever the layout dies the child
316 * will be deleted automatically. One should use elm_layout_box_remove() to
317 * make this layout forget about the object.
319 * @see elm_layout_box_append()
320 * @see elm_layout_box_prepend()
321 * @see elm_layout_box_insert_before()
322 * @see elm_layout_box_remove()
326 EAPI void elm_layout_box_insert_before(Evas_Object *obj, const char *part, Evas_Object *child, const Evas_Object *reference) EINA_ARG_NONNULL(1);
329 * Insert child to layout box part at a given position.
331 * @param obj the layout object
332 * @param part the box part to insert.
333 * @param child the child object to insert into box.
334 * @param pos the numeric position >=0 to insert the child.
336 * Once the object is inserted, it will become child of the layout. Its
337 * lifetime will be bound to the layout, whenever the layout dies the child
338 * will be deleted automatically. One should use elm_layout_box_remove() to
339 * make this layout forget about the object.
341 * @see elm_layout_box_append()
342 * @see elm_layout_box_prepend()
343 * @see elm_layout_box_insert_before()
344 * @see elm_layout_box_remove()
348 EAPI void elm_layout_box_insert_at(Evas_Object *obj, const char *part, Evas_Object *child, unsigned int pos) EINA_ARG_NONNULL(1);
351 * Remove a child of the given part box.
353 * @param obj The layout object
354 * @param part The box part name to remove child.
355 * @param child The object to remove from box.
356 * @return The object that was being used, or NULL if not found.
358 * The object will be removed from the box part and its lifetime will
359 * not be handled by the layout anymore. This is equivalent to
360 * elm_object_part_content_unset() for box.
362 * @see elm_layout_box_append()
363 * @see elm_layout_box_remove_all()
367 EAPI Evas_Object *elm_layout_box_remove(Evas_Object *obj, const char *part, Evas_Object *child) EINA_ARG_NONNULL(1, 2, 3);
370 * Remove all children of the given part box.
372 * @param obj The layout object
373 * @param part The box part name to remove child.
374 * @param clear If EINA_TRUE, then all objects will be deleted as
375 * well, otherwise they will just be removed and will be
376 * dangling on the canvas.
378 * The objects will be removed from the box part and their lifetime will
379 * not be handled by the layout anymore. This is equivalent to
380 * elm_layout_box_remove() for all box children.
382 * @see elm_layout_box_append()
383 * @see elm_layout_box_remove()
387 EAPI void elm_layout_box_remove_all(Evas_Object *obj, const char *part, Eina_Bool clear) EINA_ARG_NONNULL(1, 2);
390 * Insert child to layout table part.
392 * @param obj the layout object
393 * @param part the box part to pack child.
394 * @param child_obj the child object to pack into table.
395 * @param col the column to which the child should be added. (>= 0)
396 * @param row the row to which the child should be added. (>= 0)
397 * @param colspan how many columns should be used to store this object. (>=
399 * @param rowspan how many rows should be used to store this object. (>= 1)
401 * Once the object is inserted, it will become child of the table. Its
402 * lifetime will be bound to the layout, and whenever the layout dies the
403 * child will be deleted automatically. One should use
404 * elm_layout_table_remove() to make this layout forget about the object.
406 * If @p colspan or @p rowspan are bigger than 1, that object will occupy
407 * more space than a single cell. For instance, the following code:
409 * elm_layout_table_pack(layout, "table_part", child, 0, 1, 3, 1);
412 * Would result in an object being added like the following picture:
414 * @image html layout_colspan.png
415 * @image latex layout_colspan.eps width=\textwidth
417 * @see elm_layout_table_unpack()
418 * @see elm_layout_table_clear()
422 EAPI void elm_layout_table_pack(Evas_Object *obj, const char *part, Evas_Object *child_obj, unsigned short col, unsigned short row, unsigned short colspan, unsigned short rowspan) EINA_ARG_NONNULL(1);
425 * Unpack (remove) a child of the given part table.
427 * @param obj The layout object
428 * @param part The table part name to remove child.
429 * @param child_obj The object to remove from table.
430 * @return The object that was being used, or NULL if not found.
432 * The object will be unpacked from the table part and its lifetime
433 * will not be handled by the layout anymore. This is equivalent to
434 * elm_object_part_content_unset() for table.
436 * @see elm_layout_table_pack()
437 * @see elm_layout_table_clear()
441 EAPI Evas_Object *elm_layout_table_unpack(Evas_Object *obj, const char *part, Evas_Object *child_obj) EINA_ARG_NONNULL(1, 2, 3);
444 * Remove all the child objects of the given part table.
446 * @param obj The layout object
447 * @param part The table part name to remove child.
448 * @param clear If EINA_TRUE, then all objects will be deleted as
449 * well, otherwise they will just be removed and will be
450 * dangling on the canvas.
452 * The objects will be removed from the table part and their lifetime will
453 * not be handled by the layout anymore. This is equivalent to
454 * elm_layout_table_unpack() for all table children.
456 * @see elm_layout_table_pack()
457 * @see elm_layout_table_unpack()
461 EAPI void elm_layout_table_clear(Evas_Object *obj, const char *part, Eina_Bool clear) EINA_ARG_NONNULL(1, 2);
464 * Get the edje layout
466 * @param obj The layout object
468 * @return A Evas_Object with the edje layout settings loaded
469 * with function elm_layout_file_set
471 * This returns the edje object. It is not expected to be used to then
472 * swallow objects via edje_object_part_swallow() for example. Use
473 * elm_object_part_content_set() instead so child object handling and sizing is
476 * @note This function should only be used if you really need to call some
477 * low level Edje function on this edje object. All the common stuff (setting
478 * text, emitting signals, hooking callbacks to signals, etc.) can be done
479 * with proper elementary functions.
481 * @see elm_object_signal_callback_add()
482 * @see elm_object_signal_emit()
483 * @see elm_object_part_text_set()
484 * @see elm_object_part_content_set()
485 * @see elm_layout_box_append()
486 * @see elm_layout_table_pack()
487 * @see elm_layout_data_get()
491 EAPI Evas_Object *elm_layout_edje_get(const Evas_Object *obj) EINA_ARG_NONNULL(1);
494 * Get the edje data from the given layout
496 * @param obj The layout object
497 * @param key The data key
499 * @return The edje data string
501 * This function fetches data specified inside the edje theme of this layout.
502 * This function return NULL if data is not found.
504 * In EDC this comes from a data block within the group block that @p
505 * obj was loaded from. E.g.
512 * item: "key1" "value1";
513 * item: "key2" "value2";
521 EAPI const char *elm_layout_data_get(const Evas_Object *obj, const char *key) EINA_ARG_NONNULL(1, 2);
526 * @param obj The layout object
528 * Manually forces a sizing re-evaluation. This is useful when the minimum
529 * size required by the edje theme of this layout has changed. The change on
530 * the minimum size required by the edje theme is not immediately reported to
531 * the elementary layout, so one needs to call this function in order to tell
532 * the widget (layout) that it needs to reevaluate its own size.
534 * The minimum size of the theme is calculated based on minimum size of
535 * parts, the size of elements inside containers like box and table, etc. All
536 * of this can change due to state changes, and that's when this function
539 * Also note that a standard signal of "size,eval" "elm" emitted from the
540 * edje object will cause this to happen too.
544 EAPI void elm_layout_sizing_eval(Evas_Object *obj) EINA_ARG_NONNULL(1);
547 * Sets a specific cursor for an edje part.
549 * @param obj The layout object.
550 * @param part_name a part from loaded edje group.
551 * @param cursor cursor name to use, see Elementary_Cursor.h
553 * @return EINA_TRUE on success or EINA_FALSE on failure, that may be
554 * part not exists or it has "mouse_events: 0".
558 EAPI Eina_Bool elm_layout_part_cursor_set(Evas_Object *obj, const char *part_name, const char *cursor) EINA_ARG_NONNULL(1, 2);
561 * Get the cursor to be shown when mouse is over an edje part
563 * @param obj The layout object.
564 * @param part_name a part from loaded edje group.
565 * @return the cursor name.
569 EAPI const char *elm_layout_part_cursor_get(const Evas_Object *obj, const char *part_name) EINA_ARG_NONNULL(1, 2);
572 * Unsets a cursor previously set with elm_layout_part_cursor_set().
574 * @param obj The layout object.
575 * @param part_name a part from loaded edje group, that had a cursor set
576 * with elm_layout_part_cursor_set().
580 EAPI void elm_layout_part_cursor_unset(Evas_Object *obj, const char *part_name) EINA_ARG_NONNULL(1, 2);
583 * Sets a specific cursor style for an edje part.
585 * @param obj The layout object.
586 * @param part_name a part from loaded edje group.
587 * @param style the theme style to use (default, transparent, ...)
589 * @return EINA_TRUE on success or EINA_FALSE on failure, that may be
590 * part not exists or it did not had a cursor set.
594 EAPI Eina_Bool elm_layout_part_cursor_style_set(Evas_Object *obj, const char *part_name, const char *style) EINA_ARG_NONNULL(1, 2);
597 * Gets a specific cursor style for an edje part.
599 * @param obj The layout object.
600 * @param part_name a part from loaded edje group.
602 * @return the theme style in use, defaults to "default". If the
603 * object does not have a cursor set, then NULL is returned.
607 EAPI const char *elm_layout_part_cursor_style_get(const Evas_Object *obj, const char *part_name) EINA_ARG_NONNULL(1, 2);
610 * Sets if the cursor set should be searched on the theme or should use
611 * the provided by the engine, only.
613 * @note before you set if should look on theme you should define a
614 * cursor with elm_layout_part_cursor_set(). By default it will only
615 * look for cursors provided by the engine.
617 * @param obj The layout object.
618 * @param part_name a part from loaded edje group.
619 * @param engine_only if cursors should be just provided by the engine (EINA_TRUE)
620 * or should also search on widget's theme as well (EINA_FALSE)
622 * @return EINA_TRUE on success or EINA_FALSE on failure, that may be
623 * part not exists or it did not had a cursor set.
627 EAPI Eina_Bool elm_layout_part_cursor_engine_only_set(Evas_Object *obj, const char *part_name, Eina_Bool engine_only) EINA_ARG_NONNULL(1, 2);
630 * Gets a specific cursor engine_only for an edje part.
632 * @param obj The layout object.
633 * @param part_name a part from loaded edje group.
635 * @return whenever the cursor is just provided by engine or also from theme.
639 EAPI Eina_Bool elm_layout_part_cursor_engine_only_get(const Evas_Object *obj, const char *part_name) EINA_ARG_NONNULL(1, 2);
642 * @def elm_layout_icon_set
643 * Convenience macro to set the icon object in a layout that follows the
644 * Elementary naming convention for its parts.
648 #define elm_layout_icon_set(_ly, _obj) \
651 elm_object_part_content_set((_ly), "elm.swallow.icon", (_obj)); \
652 if ((_obj)) sig = "elm,state,icon,visible"; \
653 else sig = "elm,state,icon,hidden"; \
654 elm_object_signal_emit((_ly), sig, "elm"); \
658 * @def elm_layout_icon_get
659 * Convienience macro to get the icon object from a layout that follows the
660 * Elementary naming convention for its parts.
664 #define elm_layout_icon_get(_ly) \
665 elm_object_part_content_get((_ly), "elm.swallow.icon")
668 * @def elm_layout_end_set
669 * Convienience macro to set the end object in a layout that follows the
670 * Elementary naming convention for its parts.
674 #define elm_layout_end_set(_ly, _obj) \
677 elm_object_part_content_set((_ly), "elm.swallow.end", (_obj)); \
678 if ((_obj)) sig = "elm,state,end,visible"; \
679 else sig = "elm,state,end,hidden"; \
680 elm_object_signal_emit((_ly), sig, "elm"); \
684 * @def elm_layout_end_get
685 * Convienience macro to get the end object in a layout that follows the
686 * Elementary naming convention for its parts.
690 #define elm_layout_end_get(_ly) \
691 elm_object_part_content_get((_ly), "elm.swallow.end")
694 * @def elm_layout_label_set
695 * Convienience macro to set the label in a layout that follows the
696 * Elementary naming convention for its parts.
699 * @deprecated use elm_object_text_set() instead.
701 #define elm_layout_label_set(_ly, _txt) \
702 elm_layout_text_set((_ly), "elm.text", (_txt))
705 * @def elm_layout_label_get
706 * Convenience macro to get the label in a layout that follows the
707 * Elementary naming convention for its parts.
710 * @deprecated use elm_object_text_set() instead.
712 #define elm_layout_label_get(_ly) \
713 elm_layout_text_get((_ly), "elm.text")
715 /* smart callbacks called:
716 * "theme,changed" - when elm theme is changed.