Low level Evas canvas functions. Sub groups will present more high level ones, though.

Most of these functions deal with low level Evas actions, like:

create/destroy raw canvases, not bound to any displaying engine
tell a canvas i got focused (in a windowing context, for example)
tell a canvas a region should not be calculated anymore in rendering
tell a canvas to render its contents, immediately

Most users will be using Evas by means of the Ecore_Evas wrapper, which deals with all the above mentioned issues automatically for them. Thus, you'll be looking at this section only if you're building low level stuff.

The groups within present you functions that deal with the canvas directly, too, and not yet with its objects. They are the functions you need to use at a minimum to get a working canvas.

Some of the functions in this group are exemplified here.

Functions
void	evas_image_cache_set (Evas_Canvas *obj, int size)
	Set the image cache.
int	evas_image_cache_get (const Evas_Canvas *obj)
	Get the image cache.
void	evas_event_default_flags_set (Evas_Canvas *obj, Efl_Input_Flags flags)
	Set the default set of flags an event begins with.
Efl_Input_Flags	evas_event_default_flags_get (const Evas_Canvas *obj)
	Get the default set of flags an event begins with.
void	evas_font_cache_set (Evas_Canvas *obj, int size)
	Changes the size of font cache of the given evas.
int	evas_font_cache_get (const Evas_Canvas *obj)
	Get the size of font cache of the given evas in bytes.
void	evas_data_attach_set (Evas_Canvas obj, void data)
	Attaches a specific pointer to the evas for fetching later.
void *	evas_data_attach_get (const Evas_Canvas *obj)
	Returns the pointer attached by evas_data_attach_set.
Efl_Canvas_Object *	evas_focus_get (const Evas_Canvas *obj)
	Retrieve the object focused by the default seat.
Efl_Canvas_Object *	evas_object_top_get (const Evas_Canvas *obj)
	Get the highest (stacked) Evas object on the canvas `e`.
void	evas_pointer_canvas_xy_get (const Evas_Canvas obj, int x, int *y)
	This function returns the current known default pointer coordinates.
int	evas_event_down_count_get (const Evas_Canvas *obj)
	Get the number of mouse or multi presses currently active.
int	evas_smart_objects_calculate_count_get (const Evas_Canvas *obj)
	This gets the internal counter that counts the number of smart calculations.
Eina_Bool	evas_focus_state_get (const Evas_Canvas *obj)
	Get the focus state for the default seat.
Eina_Bool	evas_changed_get (const Evas_Canvas *obj)
	Get the changed marker for the canvas.
void	evas_pointer_output_xy_get (const Evas_Canvas obj, int x, int *y)
	This function returns the current known default pointer coordinates.
Efl_Canvas_Object *	evas_object_bottom_get (const Evas_Canvas *obj)
	Get the lowest (stacked) Evas object on the canvas `e`.
unsigned int	evas_pointer_button_down_mask_get (const Evas_Canvas *obj)
	Returns a bitmask with the default mouse buttons currently pressed, set to 1.
Eina_List *	evas_tree_objects_at_xy_get (Evas_Canvas obj, Efl_Canvas_Object stop, int x, int y)
	Retrieve a list of Evas objects lying over a given position in a canvas.
void	evas_key_lock_on (Evas_Canvas obj, const char keyname)
	Enables or turns on programmatically the lock key with name `keyname` for the default seat.
void	evas_key_modifier_add (Evas_Canvas obj, const char keyname)
	Adds the `keyname` key to the current list of modifier keys.
void	evas_key_modifier_off (Evas_Canvas obj, const char keyname)
	Disables or turns off programmatically the modifier key with name `keyname` for the default seat.
void	evas_focus_out (Evas_Canvas *obj)
void	evas_norender (Evas_Canvas *obj)
	Update the canvas internal objects but not triggering immediate renderization.
void	evas_nochange_pop (Evas_Canvas *obj)
	Pop the nochange flag down 1.
void	evas_key_lock_off (Evas_Canvas obj, const char keyname)
	Disables or turns off programmatically the lock key with name `keyname` for the default seat.
void	evas_nochange_push (Evas_Canvas *obj)
	Push the nochange flag up 1.
void	evas_font_cache_flush (Evas_Canvas *obj)
void	evas_key_modifier_on (Evas_Canvas obj, const char keyname)
	Enables or turns on programmatically the modifier key with name `keyname` for the default seat.
Eina_List *	evas_font_available_list (const Evas_Canvas *obj)
	List of available font descriptions known or found by this evas.
Efl_Canvas_Object *	evas_object_name_find (const Evas_Canvas obj, const char name)
	Retrieves the object on the given evas with the given name.
void	evas_font_path_append (Evas_Canvas obj, const char path)
	Appends a font path to the list of font paths used by the given evas.
void	evas_font_path_clear (Evas_Canvas *obj)
void	evas_key_lock_del (Evas_Canvas obj, const char keyname)
	Removes the `keyname` key from the current list of lock keys on canvas `e`.
void	evas_damage_rectangle_add (Evas_Canvas *obj, int x, int y, int w, int h)
	Add a damage rectangle.
void	evas_sync (Evas_Canvas *obj)
const Eina_List *	evas_font_path_list (const Evas_Canvas *obj)
	Retrieves the list of font paths used by the given evas.
void	evas_image_cache_reload (Evas_Canvas *obj)
	Reload the image cache.
int	evas_coord_world_x_to_screen (const Evas_Canvas *obj, int x)
	Convert/scale a canvas coordinate into output screen coordinates.
Eina_List *	evas_render_updates (Evas_Canvas *obj)
	Force immediate renderization of the given Evas canvas.
void	evas_image_cache_flush (Evas_Canvas *obj)
	Flush the image cache of the canvas.
int	evas_coord_screen_y_to_world (const Evas_Canvas *obj, int y)
	Convert/scale an output screen coordinate into canvas coordinates.
void	evas_key_modifier_del (Evas_Canvas obj, const char keyname)
	Removes the `keyname` key from the current list of modifier keys on canvas `e`.
void	evas_focus_in (Evas_Canvas *obj)
void	evas_obscured_rectangle_add (Evas_Canvas *obj, int x, int y, int w, int h)
	Add an "obscured region" to an Evas canvas.
void	evas_render_dump (Evas_Canvas *obj)
	Make the canvas discard as much data as possible used by the engine at runtime.
void	evas_render (Evas_Canvas *obj)
void	evas_font_path_prepend (Evas_Canvas obj, const char path)
	Prepends a font path to the list of font paths used by the given evas.
void	evas_obscured_clear (Evas_Canvas *obj)
	Remove all "obscured regions" from an Evas canvas.
int	evas_coord_screen_x_to_world (const Evas_Canvas *obj, int x)
	Convert/scale an output screen coordinate into canvas coordinates.
void	evas_key_lock_add (Evas_Canvas obj, const char keyname)
	Adds the `keyname` key to the current list of lock keys.
void	evas_render_idle_flush (Evas_Canvas *obj)
	Make the canvas discard internally cached data used for rendering.
int	evas_coord_world_y_to_screen (const Evas_Canvas *obj, int y)
	Convert/scale a canvas coordinate into output screen coordinates.
void	evas_render_updates_free (Eina_List *updates)
const Evas_Modifier *	evas_key_modifier_get (const Evas *obj)
	Returns a handle to the list of modifier keys registered in the canvas `e`.
Evas_Modifier_Mask	evas_key_modifier_mask_get (const Evas evas, const char keyname)
	Creates a bit mask from the `keyname` modifier key. Values returned from different calls to it may be ORed together, naturally.
const Evas_Lock *	evas_key_lock_get (const Evas *obj)
	Returns a handle to the list of lock keys registered in the canvas `e`.
Eina_Bool	evas_pointer_inside_get (const Evas *obj)
	Returns whether the default mouse pointer is logically inside the canvas.
Evas_Object *	evas_object_top_in_rectangle_get (const Eo *obj, int x, int y, int w, int h, Eina_Bool include_pass_events_objects, Eina_Bool include_hidden_objects)
	Retrieve the Evas object stacked at the top of a given rectangular region in a canvas.
void	evas_output_view_get (const Evas_Out obj, Evas_Coord x, Evas_Coord y, Evas_Coord w, Evas_Coord *h) EINA_DEPRECATED
	Gets the viewport region of the canvas that the output display.
void	evas_output_framespace_set (Evas *e, Evas_Coord x, Evas_Coord y, Evas_Coord w, Evas_Coord h)
	Sets the output framespace size of the render engine of the given evas.
void	evas_output_framespace_get (const Evas e, Evas_Coord x, Evas_Coord y, Evas_Coord w, Evas_Coord *h)
	Get the render engine's output framespace coordinates in canvas units.
void	evas_output_viewport_set (Evas *e, Evas_Coord x, Evas_Coord y, Evas_Coord w, Evas_Coord h)
	Sets the output viewport of the given evas in evas units.
void	evas_output_viewport_get (const Evas e, Evas_Coord x, Evas_Coord y, Evas_Coord w, Evas_Coord *h)
	Get the render engine's output viewport coordinates in canvas units.
void	evas_output_method_set (Evas *e, int render_method)
	Sets the output engine for the given evas.
int	evas_output_method_get (const Evas *e)
	Retrieves the number of the output engine used for the given evas.
void	evas_output_size_set (Evas *e, int w, int h)
	Sets the output size of the render engine of the given evas.
void	evas_output_size_get (const Evas e, int w, int *h)
	Retrieve the output size of the render engine of the given evas.
Typedefs
typedef Eo	Evas
typedef struct _Evas_Public_Data	Evas_Public_Data

Typedef Documentation

Evas

An opaque handle to an Evas canvas.

See also:: evas_new(); evas_free()

Evas_Public_Data

Public data for an Evas.

Function Documentation

Eina_Bool evas_changed_get ( const Evas_Canvas * obj )

Get the changed marker for the canvas.

Parameters:

[in] obj The object.

Returns:: true if changed, false otherwise

Since (EFL) :: 1.11

Since :: 4.0b

int evas_coord_screen_x_to_world	(	const Evas_Canvas *	obj,
		int	x
	)

Convert/scale an output screen coordinate into canvas coordinates.

This function takes in a horizontal coordinate as the x parameter and converts it into canvas units, accounting for output size, viewport size and location, returning it as the function return value. If e is invalid, the results are undefined.

Parameters:

[in]	obj	The object.
[in]	x	The screen/output x coordinate.

Returns:: The screen coordinate translated to canvas unit coordinates.

Since :: 2.3

int evas_coord_screen_y_to_world	(	const Evas_Canvas *	obj,
		int	y
	)

Convert/scale an output screen coordinate into canvas coordinates.

This function takes in a vertical coordinate as the y parameter and converts it into canvas units, accounting for output size, viewport size and location, returning it as the function return value. If e is invalid, the results are undefined.

Parameters:

[in]	obj	The object.
[in]	y	The screen/output y coordinate.

Returns:: The screen coordinate translated to canvas unit coordinates.

Since :: 2.3

int evas_coord_world_x_to_screen	(	const Evas_Canvas *	obj,
		int	x
	)

Convert/scale a canvas coordinate into output screen coordinates.

This function takes in a horizontal coordinate as the x parameter and converts it into output units, accounting for output size, viewport size and location, returning it as the function return value. If e is invalid, the results are undefined.

Parameters:

[in]	obj	The object.
[in]	x	The canvas X coordinate.

Returns:: The output/screen coordinate translated to output coordinates.

Since :: 2.3

int evas_coord_world_y_to_screen	(	const Evas_Canvas *	obj,
		int	y
	)

Convert/scale a canvas coordinate into output screen coordinates.

This function takes in a vertical coordinate as the x parameter and converts it into output units, accounting for output size, viewport size and location, returning it as the function return value. If e is invalid, the results are undefined.

Parameters:

[in]	obj	The object.
[in]	y	The canvas y coordinate.

Returns:: The output/screen coordinate translated to output coordinates.

Since :: 2.3

void evas_damage_rectangle_add	(	Evas_Canvas *	obj,
		int	x,
		int	y,
		int	w,
		int	h
	)

Add a damage rectangle.

This is the function by which one tells evas that a part of the canvas has to be repainted.

Note:: All newly created Evas rectangles get the default color values of 255 255 255 255 (opaque white).

Parameters:

[in]	obj	The object.
[in]	x	The rectangle's left position.
[in]	y	The rectangle's top position.
[in]	w	The rectangle's width.
[in]	h	The rectangle's height.

Since :: 2.3

Examples:: evas-events.c.

void* evas_data_attach_get ( const Evas_Canvas * obj )

Returns the pointer attached by evas_data_attach_set.

Parameters:

[in] obj The object.

Returns:: The attached pointer.

Since :: 2.3

void evas_data_attach_set	(	Evas_Canvas *	obj,
		void *	data
	)

Attaches a specific pointer to the evas for fetching later.

Parameters:

[in]	obj	The object.
[in]	data	The attached pointer.

Since :: 2.3

Evas_Engine_Info* evas_engine_info_get ( const Evas * obj )

Retrieves the current render engine info struct from the given evas.

The returned structure is publicly modifiable. The contents are valid until either evas_engine_info_set or evas_render are called.

This structure does not need to be freed by the caller.

Returns:: The pointer to the engine info to use.

Since :: 2.3

Examples:: evas-buffer-simple.c.

Eina_Bool evas_engine_info_set	(	Evas *	obj,
		Evas_Engine_Info *	info
	)

Applies the engine settings for the given evas from the given Evas_Engine_Info structure.

To get the Evas_Engine_Info structure to use, call evas_engine_info_get. Do not try to obtain a pointer to an Evas_Engine_Info structure in any other way.

You will need to call this function at least once before you can create objects on an evas or render that evas. Some engines allow their settings to be changed more than once.

Once called, the info pointer should be considered invalid.

Parameters:

[in] info The pointer to the engine info to use.

Returns:: true if no error occurred, false otherwise.

Since :: 2.3

Examples:: evas-buffer-simple.c.

Efl_Input_Flags evas_event_default_flags_get ( const Evas_Canvas * obj )

Get the default set of flags an event begins with.

This gets the default event flags events are produced with when fed in.

Parameters:

[in] obj The object.

Returns:: The default flags to use.

Since (EFL) :: 1.2

Since :: 2.3

void evas_event_default_flags_set	(	Evas_Canvas *	obj,
		Efl_Input_Flags	flags
	)

Set the default set of flags an event begins with.

Events in evas can have an event_flags member. This starts out with an initial value (no flags). This lets you set the default flags that an event begins with to flags.

Parameters:

[in]	obj	The object.
[in]	flags	The default flags to use.

Since (EFL) :: 1.2

Since :: 2.3

int evas_event_down_count_get ( const Evas_Canvas * obj )

Get the number of mouse or multi presses currently active.

Parameters:

[in] obj The object.

Returns:: Mouse or multi presses currently active

Since (EFL) :: 1.2

Since :: 3.0

Efl_Canvas_Object* evas_focus_get ( const Evas_Canvas * obj )

Retrieve the object focused by the default seat.

Focused objects will be the ones having key events delivered to, which the programmer can act upon by means of evas_object_event_callback_add usage.

Note:: Most users wouldn't be dealing directly with Evas' focused objects. Instead, they would be using a higher level library for that (like a toolkit, as Elementary) to handle focus and who's receiving input for them.

This call returns the object that currently has focus on the canvas e or null, if none.

See also evas_object_focus_set, evas_object_focus_get, evas_object_key_grab, evas_object_key_ungrab, evas_seat_focus_get, Efl::Canvas::Object::seat_focus_check, Efl::Canvas::Object::seat_focus_add, Efl::Canvas::Object::seat_focus_del.

Parameters:

[in] obj The object.

Returns:: The object that has focus or null if there is not one.

Since :: 3.0

Examples:: ecore_imf_example.c, and evas-events.c.

void evas_focus_in ( Evas_Canvas * obj )

Inform to the evas that it got the focus from the default seat.

Since :: 2.3

void evas_focus_out ( Evas_Canvas * obj )

Inform the evas that it lost the focus from the default seat.

Since :: 2.3

Eina_Bool evas_focus_state_get ( const Evas_Canvas * obj )

Get the focus state for the default seat.

Parameters:

[in] obj The object.

Returns:: true if focused, false otherwise

Since :: 2.3

Eina_List* evas_font_available_list ( const Evas_Canvas * obj )

List of available font descriptions known or found by this evas.

The list depends on Evas compile time configuration, such as fontconfig support, and the paths provided at runtime as explained in Font Path Functions.

Parameters:

[in] obj The object.

Returns:: A newly allocated list of strings. Do not change the strings. Be sure to call evas_font_available_list_free after you're done.

Since :: 3.0

void evas_font_cache_flush ( Evas_Canvas * obj )

Force the given evas and associated engine to flush its font cache.

Since :: 3.0

int evas_font_cache_get ( const Evas_Canvas * obj )

Get the size of font cache of the given evas in bytes.

Parameters:

[in] obj The object.

Returns:: The size in bytes.

Since :: 3.0

void evas_font_cache_set	(	Evas_Canvas *	obj,
		int	size
	)

Changes the size of font cache of the given evas.

Parameters:

[in]	obj	The object.
[in]	size	The size in bytes.

Since :: 3.0

Eina_Bool evas_font_hinting_can_hint	(	const Evas *	e,
		Evas_Font_Hinting_Flags	hinting
	)

Checks if the font hinting is supported by the given evas.

One of #EVAS_FONT_HINTING_NONE, #EVAS_FONT_HINTING_AUTO, #EVAS_FONT_HINTING_BYTECODE.

Parameters:

[in] hinting The hinting to use.

Returns:: true if it is supported, false otherwise.

Since :: 3.0

void evas_font_path_append	(	Evas_Canvas *	obj,
		const char *	path
	)

Appends a font path to the list of font paths used by the given evas.

Parameters:

[in]	obj	The object.
[in]	path	The new font path.

Since :: 3.0

void evas_font_path_clear ( Evas_Canvas * obj )

Removes all font paths loaded into memory for the given evas.

Since :: 3.0

const Eina_List* evas_font_path_list ( const Evas_Canvas * obj )

Retrieves the list of font paths used by the given evas.

Parameters:

[in] obj The object.

Returns:: The list of font paths used.

Since :: 3.0

void evas_font_path_prepend	(	Evas_Canvas *	obj,
		const char *	path
	)

Prepends a font path to the list of font paths used by the given evas.

Parameters:

[in]	obj	The object.
[in]	path	The new font path.

Since :: 3.0

void evas_free ( Evas * e )

Frees the given evas and any objects created on it.

Any objects with 'free' callbacks will have those callbacks called in this function.

Parameters:

e	The given evas.

Since :: 2.3

Examples:: evas-buffer-simple.c.

void evas_image_cache_flush ( Evas_Canvas * obj )

Flush the image cache of the canvas.

This function flushes image cache of canvas.

Parameters:

[in] obj The object.

Since :: 3.0

int evas_image_cache_get ( const Evas_Canvas * obj )

Get the image cache.

This function returns the image cache size of canvas in bytes.

Parameters:

[in] obj The object.

Returns:: The cache size.

Since :: 3.0

void evas_image_cache_reload ( Evas_Canvas * obj )

Reload the image cache.

This function reloads the image cache of canvas.

Parameters:

[in] obj The object.

Since :: 3.0

void evas_image_cache_set	(	Evas_Canvas *	obj,
		int	size
	)

Set the image cache.

This function sets the image cache of canvas in bytes.

Parameters:

[in]	obj	The object.
[in]	size	The cache size.

Since :: 3.0

void evas_key_lock_add	(	Evas_Canvas *	obj,
		const char *	keyname
	)

Adds the keyname key to the current list of lock keys.

Locks are keys like caps lock, num lock or scroll lock, i.e., keys which are meant to be pressed once -- toggling a binary state which is bound to it -- and thus altering the behavior of all subsequently pressed keys somehow, depending on its state. Evas is so that these keys can be defined by the user.

This allows custom locks to be added to the evas system at run time. It is then possible to set and unset lock keys programmatically for other parts of the program to check and act on. Programmers using Evas would check for lock keys on key event callbacks using evas_key_lock_is_set.

Note:: If the programmer instantiates the canvas by means of the ecore_evas_new() family of helper functions, Ecore will take care of registering on it all standard lock keys: "Caps_Lock", "Num_Lock", "Scroll_Lock".

Parameters:

[in]	obj	The object.
[in]	keyname	The name of the key to add to the locks list.

Since :: 2.3

void evas_key_lock_del	(	Evas_Canvas *	obj,
		const char *	keyname
	)

Removes the keyname key from the current list of lock keys on canvas e.

Parameters:

[in]	obj	The object.
[in]	keyname	The name of the key to remove from the locks list.

Since :: 2.3

const Evas_Lock* evas_key_lock_get ( const Evas * obj )

Returns a handle to the list of lock keys registered in the canvas e.

This is required to check for which locks are set at a given time with the evas_key_lock_is_set function.

Returns:: An Evas_Lock handle to query Evas' keys subsystem with evas_key_lock_is_set or evas_seat_key_lock_is_set, or null on error.

Since :: 2.3

void evas_key_lock_off	(	Evas_Canvas *	obj,
		const char *	keyname
	)

Disables or turns off programmatically the lock key with name keyname for the default seat.

The effect will be as if the key was put on its inactive state after this call.

See also evas_key_lock_on, evas_seat_key_lock_on, evas_seat_key_lock_off.

Parameters:

[in]	obj	The object.
[in]	keyname	The name of the lock to disable.

Since :: 2.3

void evas_key_lock_on	(	Evas_Canvas *	obj,
		const char *	keyname
	)

Enables or turns on programmatically the lock key with name keyname for the default seat.

The effect will be as if the key was put on its active state after this call.

See also evas_key_lock_add, evas_key_lock_del, evas_key_lock_del, evas_key_lock_off, evas_seat_key_lock_on, evas_seat_key_lock_off.

Parameters:

[in]	obj	The object.
[in]	keyname	The name of the lock to enable.

Since :: 2.3

void evas_key_modifier_add	(	Evas_Canvas *	obj,
		const char *	keyname
	)

Adds the keyname key to the current list of modifier keys.

Modifiers are keys like shift, alt and ctrl, i.e. keys which are meant to be pressed together with others, altering the behavior of the second keys pressed. Evas is so that these keys can be user defined.

This call allows custom modifiers to be added to the Evas system at run time. It is then possible to set and unset modifier keys programmatically for other parts of the program to check and act on. Programmers using Evas would check for modifier keys on key event callbacks using evas_key_modifier_is_set.

Note:: If the programmer instantiates the canvas by means of the ecore_evas_new family of helper functions, Ecore will take care of registering on it all standard modifiers: "Shift", "Control", "Alt", "Meta", "Hyper", "Super".

Parameters:

[in]	obj	The object.
[in]	keyname	The name of the modifier key to add to the list of Evas modifiers.

Since :: 2.3

void evas_key_modifier_del	(	Evas_Canvas *	obj,
		const char *	keyname
	)

Removes the keyname key from the current list of modifier keys on canvas e.

See also evas_key_modifier_add.

Parameters:

[in]	obj	The object.
[in]	keyname	The name of the key to remove from the modifiers list.

Since :: 2.3

const Evas_Modifier* evas_key_modifier_get ( const Evas * obj )

Returns a handle to the list of modifier keys registered in the canvas e.

This is required to check for which modifiers are set at a given time with the evas_key_modifier_is_set function.

See also evas_key_modifier_add, evas_key_modifier_del, evas_key_modifier_on, evas_key_modifier_off, evas_seat_key_modifier_on, evas_seat_key_modifier_off.

Returns:: An Evas_Modifier handle to query Evas' keys subsystem with evas_key_modifier_is_set or evas_seat_key_modifier_is_set, or null on error.

Since :: 2.3

Examples:: edje-box2.c, evas-aspect-hints.c, evas-box.c, evas-events.c, evas-hints.c, and web_example_02.c.

Evas_Modifier_Mask evas_key_modifier_mask_get	(	const Evas *	evas,
		const char *	keyname
	)

Creates a bit mask from the keyname modifier key. Values returned from different calls to it may be ORed together, naturally.

This function is meant to be using in conjunction with evas_object_key_grab/@ref evas_object_key_ungrab. Go check their documentation for more information.

See also evas_key_modifier_add, evas_key_modifier_get, evas_key_modifier_on, evas_key_modifier_off, evas_seat_key_modifier_on, evas_seat_key_modifier_off, evas_key_modifier_is_set, evas_seat_key_modifier_is_set..

Parameters:

[in] keyname The name of the modifier key to create the mask for.

Returns:: The bit mask or 0 if the keyname key wasn't registered as a modifier for canvas e.

Since :: 2.3

Examples:: evas-events.c, and web_example_02.c.

void evas_key_modifier_off	(	Evas_Canvas *	obj,
		const char *	keyname
	)

Disables or turns off programmatically the modifier key with name keyname for the default seat.

See also evas_key_modifier_add, evas_key_modifier_get, evas_key_modifier_on, evas_seat_key_modifier_off, evas_seat_key_modifier_off, evas_key_modifier_is_set, evas_seat_key_modifier_is_set.

Parameters:

[in]	obj	The object.
[in]	keyname	The name of the modifier to disable.

Since :: 2.3

void evas_key_modifier_on	(	Evas_Canvas *	obj,
		const char *	keyname
	)

Enables or turns on programmatically the modifier key with name keyname for the default seat.

The effect will be as if the key was pressed for the whole time between this call and a matching evas_key_modifier_off().

See also evas_key_modifier_off, evas_seat_key_modifier_on, evas_seat_key_modifier_off.

Parameters:

[in]	obj	The object.
[in]	keyname	The name of the modifier to enable.

Since :: 2.3

Evas* evas_new ( void )

Creates a new empty evas.

Note that before you can use the evas, you will to at a minimum:

Set its render method with evas_output_method_set .
Set its viewport size with evas_output_viewport_set .
Set its size of the canvas with evas_output_size_set .
Ensure that the render engine is given the correct settings with evas_engine_info_set .

This function should only fail if the memory allocation fails

Note:: this function is very low level. Instead of using it directly, consider using the high level functions in Ecore_Evas wrapper/helper set of functions such as ecore_evas_new(). See Ecore.

Attention:: it is recommended that one calls evas_init() before creating new canvas.

Returns:: A new uninitialised Evas canvas on success. Otherwise, NULL.

Since :: 2.3

Examples:: evas-buffer-simple.c.

void evas_nochange_pop ( Evas_Canvas * obj )

Pop the nochange flag down 1.

This tells evas, that while the nochange flag is greater than 0, do not mark objects as "changed" when making changes.

Warning:: Do not use this function unless you know what Evas exactly works with "changed" state.

Parameters:

[in] obj The object.

Since :: 2.3

void evas_nochange_push ( Evas_Canvas * obj )

Push the nochange flag up 1.

This tells evas, that while the nochange flag is greater than 0, do not mark objects as "changed" when making changes.

Warning:: Do not use this function unless you know what Evas exactly works with "changed" state.

Parameters:

[in] obj The object.

Since :: 2.3

void evas_norender ( Evas_Canvas * obj )

Update the canvas internal objects but not triggering immediate renderization.

This function updates the canvas internal objects not triggering renderization. To force renderization function evas_render should be used.

Parameters:

[in] obj The object.

Since :: 2.3

Efl_Canvas_Object* evas_object_bottom_get ( const Evas_Canvas * obj )

Get the lowest (stacked) Evas object on the canvas e.

This function will take all populated layers in the canvas into account, getting the lowest object for the lowest layer, naturally.

Warning:: This function will skip objects parented by smart objects, acting only on the ones at the "top level", with regard to object parenting.

See also evas_object_layer_get, evas_object_layer_set, evas_object_below_get, evas_object_below_set.

Parameters:

[in] obj The object.

Returns:: A pointer to the lowest object on it, if any, or null otherwise.

Since :: 3.0

Efl_Canvas_Object* evas_object_name_find	(	const Evas_Canvas *	obj,
		const char *	name
	)

Retrieves the object on the given evas with the given name.

This looks for the evas object given a name by evas_object_name_set. If the name is not unique canvas-wide, then which one of the many objects with that name is returned is undefined, so only use this if you can ensure the object name is unique.

Parameters:

[in]	obj	The object.
[in]	name	The given name.

Returns:: If successful, the Evas object with the given name. Otherwise, null.

Since :: 3.0

Examples:: evas-map-utils.c.

Efl_Canvas_Object* evas_object_top_get ( const Evas_Canvas * obj )

Get the highest (stacked) Evas object on the canvas e.

This function will take all populated layers in the canvas into account, getting the highest object for the highest layer, naturally.

Warning:: This function will skip objects parented by smart objects, acting only on the ones at the "top level", with regard to object parenting.

Parameters:

[in] obj The object.

Returns:: A pointer to the highest object on it (if any) or null otherwise.

Since :: 3.0

Examples:: evas-stacking.c.

Evas_Object* evas_object_top_in_rectangle_get	(	const Eo *	obj,
		int	x,
		int	y,
		int	w,
		int	h,
		Eina_Bool	include_pass_events_objects,
		Eina_Bool	include_hidden_objects
	)

Retrieve the Evas object stacked at the top of a given rectangular region in a canvas.

This function will traverse all the layers of the given canvas, from top to bottom, querying for objects with areas overlapping with the given rectangular region inside e. The user can remove from the query objects which are hidden and/or which are set to pass events.

Warning:: This function will skip objects parented by smart objects, acting only on the ones at the "top level", with regard to object parenting.

Parameters:

[in]	obj	The object.
[in]	x	The top left corner's horizontal coordinate for the rectangular region.
[in]	y	The top left corner's vertical coordinate for the rectangular region.
[in]	w	The width of the rectangular region.
[in]	h	The height of the rectangular region.
[in]	include_pass_events_objects	Boolean flag to include or not objects which pass events in this calculation.
[in]	include_hidden_objects	Boolean flag to include or not hidden objects in this calculation.

Returns:: The Evas object that is over all other objects at the given rectangular region.

Since :: 3.0

void evas_obscured_clear ( Evas_Canvas * obj )

Remove all "obscured regions" from an Evas canvas.

This function removes all the rectangles from the obscured regions list of the canvas e. It takes obscured areas added with evas_obscured_rectangle_add and make them again a regions that have to be repainted on rendering updates.

Note:: This is a very low level function, which most of Evas' users wouldn't care about.; This function does not flag the canvas as having its state changed. If you want to re-render it afterwards expecting new contents, you have to add "damage" regions yourself (see evas_damage_rectangle_add).

Parameters:

[in] obj The object.

Since :: 2.3

Examples:: evas-events.c.

void evas_obscured_rectangle_add	(	Evas_Canvas *	obj,
		int	x,
		int	y,
		int	w,
		int	h
	)

Add an "obscured region" to an Evas canvas.

This is the function by which one tells an Evas canvas that a part of it must not be repainted. The region must be rectangular and its coordinates inside the canvas viewport are passed in the call. After this call, the region specified won't participate in any form in Evas' calculations and actions during its rendering updates, having its displaying content frozen as it was just after this function took place.

We call it "obscured region" because the most common use case for this rendering (partial) freeze is something else (most probably other canvas) being on top of the specified rectangular region, thus shading it completely from the user's final scene in a display. To avoid unnecessary processing, one should indicate to the obscured canvas not to bother about the non-important area.

The majority of users won't have to worry about this function, as they'll be using just one canvas in their applications, with nothing inset or on top of it in any form.

To make this region one that has to be repainted again, call the function evas_obscured_clear.

Note:: This is a very low level function, which most of Evas' users wouldn't care about.; This function does not flag the canvas as having its state changed. If you want to re-render it afterwards expecting new contents, you have to add "damage" regions yourself (see evas_damage_rectangle_add).

Parameters:

[in]	obj	The object.
[in]	x	The rectangle's top left corner's horizontal coordinate.
[in]	y	The rectangle's top left corner's vertical coordinate.
[in]	w	The rectangle's width.
[in]	h	The rectangle's height.

Since :: 2.3

Examples:: evas-events.c.

void evas_output_framespace_get	(	const Evas *	e,
		Evas_Coord *	x,
		Evas_Coord *	y,
		Evas_Coord *	w,
		Evas_Coord *	h
	)

Get the render engine's output framespace coordinates in canvas units.

Parameters:

[out]	x	The left coordinate in output units, usually pixels.
[out]	y	The top coordinate in output units, usually pixels.
[out]	w	The width in output units, usually pixels.
[out]	h	The height in output units, usually pixels.

Since (EFL) :: 1.1

Since :: 2.3

void evas_output_framespace_set	(	Evas *	e,
		Evas_Coord	x,
		Evas_Coord	y,
		Evas_Coord	w,
		Evas_Coord	h
	)

Sets the output framespace size of the render engine of the given evas.

The framespace size is used in the Wayland engines to denote space in the viewport which is occupied by the window frame. This is mainly used in ecore_evas to draw borders.

The units used for w and h depend on the engine used by the evas.

Parameters:

[in]	x	The left coordinate in output units, usually pixels.
[in]	y	The top coordinate in output units, usually pixels.
[in]	w	The width in output units, usually pixels.
[in]	h	The height in output units, usually pixels.

Since (EFL) :: 1.1

Since :: 2.3

int evas_output_method_get ( const Evas * e )

Retrieves the number of the output engine used for the given evas.

Returns:: The numeric engine value to use.

Since :: 2.3

void evas_output_method_set	(	Evas *	e,
		int	render_method
	)

Sets the output engine for the given evas.

Once the output engine for an evas is set, any attempt to change it will be ignored. The value for render_method can be found using evas_render_method_lookup.

Note:: it is mandatory that one calls evas_init before setting the output method.

Parameters:

[in] render_method The numeric engine value to use.

Since :: 2.3

Examples:: evas-buffer-simple.c.

void evas_output_size_get	(	const Evas *	e,
		int *	w,
		int *	h
	)

Retrieve the output size of the render engine of the given evas.

The output size is given in whatever the output units are for the engine.

If either w or h is null, then it is ignored. If e is invalid, the returned results are undefined.

Parameters:

[out]	w	The width in output units, usually pixels.
[out]	h	The height in output units, usually pixels.

Since :: 2.3

Examples:: ecore_evas_buffer_example_01.c, evas-buffer-simple.c, and evas-map-utils.c.

void evas_output_size_set	(	Evas *	e,
		int	w,
		int	h
	)

Sets the output size of the render engine of the given evas.

The evas will render to a rectangle of the given size once this function is called. The output size is independent of the viewport size. The viewport will be stretched to fill the given rectangle.

The units used for w and h depend on the engine used by the evas.

Parameters:

[in]	w	The width in output units, usually pixels.
[in]	h	The height in output units, usually pixels.

Since :: 2.3

Examples:: evas-buffer-simple.c.

void evas_output_view_get	(	const Evas_Out *	obj,
		Evas_Coord *	x,
		Evas_Coord *	y,
		Evas_Coord *	w,
		Evas_Coord *	h
	)

Gets the viewport region of the canvas that the output display.

Parameters:

[in]	obj	The object
[out]	x
[out]	y
[out]	w
[out]	h

Since :: 3.0

Deprecated:: evas_output_view_get

void evas_output_viewport_get	(	const Evas *	e,
		Evas_Coord *	x,
		Evas_Coord *	y,
		Evas_Coord *	w,
		Evas_Coord *	h
	)

Get the render engine's output viewport coordinates in canvas units.

Calling this function writes the current canvas output viewport size and location values into the variables pointed to by x, y, w and h. On success the variables have the output location and size values written to them in canvas units. Any of x, y, w or h that are null will not be written to. If e is invalid, the results are undefined.

Parameters:

[out]	x	The top-left corner x value of the viewport.
[out]	y	The top-left corner y value of the viewport.
[out]	w	The width of the viewport. Must be greater than 0.
[out]	h	The height of the viewport. Must be greater than 0.

Since :: 2.3

Examples:: evas-events.c.

void evas_output_viewport_set	(	Evas *	e,
		Evas_Coord	x,
		Evas_Coord	y,
		Evas_Coord	w,
		Evas_Coord	h
	)

Sets the output viewport of the given evas in evas units.

The output viewport is the area of the evas that will be visible to the viewer. The viewport will be stretched to fit the output target of the evas when rendering is performed.

Note:: The coordinate values do not have to map 1-to-1 with the output target. However, it is generally advised that it is done for ease of use.

Parameters:

[in]	x	The top-left corner x value of the viewport.
[in]	y	The top-left corner y value of the viewport.
[in]	w	The width of the viewport. Must be greater than 0.
[in]	h	The height of the viewport. Must be greater than 0.

Since :: 2.3

Examples:: evas-buffer-simple.c.

unsigned int evas_pointer_button_down_mask_get ( const Evas_Canvas * obj )

Returns a bitmask with the default mouse buttons currently pressed, set to 1.

Calling this function will return a 32-bit integer with the appropriate bits set to 1, which correspond to a mouse button being depressed. This limits Evas to a mouse devices with a maximum of 32 buttons, but that is generally in excess of any host system's pointing device abilities.

A canvas by default begins with no mouse buttons being pressed and only pointer move events can alter that.

The least significant bit corresponds to the first mouse button (button 1) and the most significant bit corresponds to the last mouse button (button 32).

If e is not a valid canvas, the return value is undefined.

Parameters:

[in] obj The object.

Returns:: A bitmask of the currently depressed buttons on the canvas.

Since :: 2.3

void evas_pointer_canvas_xy_get	(	const Evas_Canvas *	obj,
		int *	x,
		int *	y
	)

This function returns the current known default pointer coordinates.

This function returns the current known canvas unit coordinates of the mouse pointer and sets the contents of the Evas_Coords pointed to by x and y to contain these coordinates. If e is not a valid canvas the results of this function are undefined.

Parameters:

[in]	obj	The object.
[out]	x	The pointer to a Evas_Coord to be filled in.
[out]	y	The pointer to a Evas_Coord to be filled in.

Since :: 2.3

Examples:: ctxpopup_example_01.c, and evas-map-utils.c.

Eina_Bool evas_pointer_inside_get ( const Evas * obj )

Returns whether the default mouse pointer is logically inside the canvas.

When this function is called it will return a value of either false or true, depending on if event_feed_mouse_in or event_feed_mouse_out have been called to feed in a mouse enter event into the canvas.

A return value of true indicates the mouse is logically inside the canvas, and false implies it is logically outside the canvas.

A canvas begins with the mouse being assumed outside ($false).

If e is not a valid canvas, the return value is undefined.

Parameters:

[in] obj The object.

Returns:: true if the mouse pointer is inside the canvas, false otherwise

Since :: 2.3

void evas_pointer_output_xy_get	(	const Evas_Canvas *	obj,
		int *	x,
		int *	y
	)

This function returns the current known default pointer coordinates.

This function returns the current known screen/output coordinates of the mouse pointer and sets the contents of the integers pointed to by x and y to contain these coordinates. If e is not a valid canvas the results of this function are undefined.

Parameters:

[in]	obj	The object.
[out]	x	The pointer to an integer to be filled in.
[out]	y	The pointer to an integer to be filled in.

Since :: 2.3

void evas_render ( Evas_Canvas * obj )

Force renderization of the given canvas.

Since :: 2.3

void evas_render_dump ( Evas_Canvas * obj )

Make the canvas discard as much data as possible used by the engine at runtime.

This function will unload images, delete textures and much more where possible. You may also want to call evas_render_idle_flush immediately prior to this to perhaps discard a little more, though this function should implicitly delete most of what evas_render_idle_flush might discard too.

Parameters:

[in] obj The object.

Since :: 2.3

void evas_render_idle_flush ( Evas_Canvas * obj )

Make the canvas discard internally cached data used for rendering.

This function flushes the arrays of delete, active and render objects. Other things it may also discard are: shared memory segments, temporary scratch buffers, cached data to avoid re-compute of that data etc.

Parameters:

[in] obj The object.

Since :: 2.3

Eina_List* evas_render_updates ( Evas_Canvas * obj )

Force immediate renderization of the given Evas canvas.

This function forces an immediate renderization update of the given canvas e.

Note:: This is a very low level function, which most of Evas' users wouldn't care about. You might use it, for instance, to grab an Evas' canvas update regions and paint them back, using the canvas' pixmap, on a displaying system working below Evas.; Evas is a stateful canvas. If no operations changing its state took place since the last rendering action, you won't see any changes and this call will be a no-op.

Parameters:

[in] obj The object.

Returns:: A newly allocated list of updated rectangles of the canvas ($Eina.Rect structs). Free this list with evas_render_updates_free.

Since :: 2.3

Examples:: evas-buffer-simple.c, and evas-events.c.

void evas_render_updates_free ( Eina_List * updates )

Free the rectangles returned by evas_render_updates().

Parameters:

updates The list of updated rectangles of the canvas.

This function removes the region from the render updates list. It makes the region doesn't be render updated anymore.

See also:: evas_render_updates() for an example

Since :: 2.3

Examples:: evas-buffer-simple.c, and evas-events.c.

void evas_smart_objects_calculate ( Eo * obj )

Call user-provided calculate smart functions and unset the flag signalling that the object needs to get recalculated to all smart objects in the canvas.

Since :: 2.3

Examples:: map_example_01.c, map_example_02.c, and map_example_03.c.

int evas_smart_objects_calculate_count_get ( const Evas_Canvas * obj )

This gets the internal counter that counts the number of smart calculations.

Whenever evas performs smart object calculations on the whole canvas it increments a counter by 1. This function returns the value of the smart object calculate counter. It starts with a value of 0 and will increase (and eventually wrap around to negative values and so on) by 1 every time objects are calculated. You can use this counter to ensure you don't re-do calculations withint the same calculation generation/run if the calculations maybe cause self-feeding effects.

Parameters:

[in] obj The object.

Returns:: Number of smart calculations

Since (EFL) :: 1.1

Since :: 2.3

void evas_sync ( Evas_Canvas * obj )

Sync evas canvas

Since :: 3.0

Eina_List* evas_tree_objects_at_xy_get	(	Evas_Canvas *	obj,
		Efl_Canvas_Object *	stop,
		int	x,
		int	y
	)

Retrieve a list of Evas objects lying over a given position in a canvas.

This function will traverse all the layers of the given canvas, from top to bottom, querying for objects with areas covering the given position. It will enter the smart objects. It will not append to the list pass events as hidden objects. Call eina_list_free on the returned list after usage.

Parameters:

[in]	obj	The object.
[in]	stop	An Evas Object where to stop searching.
[in]	x	The horizontal coordinate of the position.
[in]	y	The vertical coordinate of the position.

Returns:: List of objects

Since :: 3.0

Functions

Typedefs

Typedef Documentation

Function Documentation