Copy and paste feature implementations.

Implements the following functionality a. select, copy/cut and paste b. clipboard c. drag and drop in order to share data across application windows.

Contains functions to select text or a portion of data, send it to a buffer, and paste the data into a target.

elm_cnp provides a generic copy and paste facility based on its windowing system. It is not necessary to know the details of each windowing system, but some terms and behavior are common. Currently the X11 window system is widely used, and only X11 functionality is implemented.

In X11R6 window system, CopyPaste works like a peer-to-peer communication. Copying is an operation on an object in an X server. X11 calls those objects 'selections' which have names. Generally, two selection types are needed for copy and paste: The Primary selection and the Clipboard selection. Primary selection is for selecting text (that means highlighted text). Clipboard selection is for explicit copying behavior (such as ctrl+c, or 'copy' in a menu). Thus, in applications most cases only use the clipboard selection. As stated before, taking ownership of a selection doesn't move any actual data. Copying and Pasting is described as follows: 1. Copy text in Program A : Program A takes ownership of the selection 2. Paste text in Program B : Program B notes that Program A owns the selection 3. Program B asks A for the text 4. Program A responds and sends the text to program B 5. Program B pastes the response More information is on

http://www.jwz.org/doc/x-cut-and-paste.html
X11R6 Inter-Client Communication Conventions Manual, section 2

TODO: add for other window system.

Functions
Eina_Bool	elm_cnp_selection_set (Evas_Object obj, Elm_Sel_Type selection, Elm_Sel_Format format, const void buf, size_t buflen)
	Set copy data for a widget.
Eina_Bool	elm_cnp_selection_get (const Evas_Object obj, Elm_Sel_Type selection, Elm_Sel_Format format, Elm_Drop_Cb datacb, void udata)
	Get data from a widget that has a selection.
Eina_Bool	elm_object_cnp_selection_clear (Evas_Object *obj, Elm_Sel_Type selection)
	Clear the selection data of a widget.
void	elm_cnp_selection_loss_callback_set (Evas_Object obj, Elm_Sel_Type selection, Elm_Selection_Loss_Cb func, const void data)
	Set a function to be called when a selection is lost.
Eina_Bool	elm_cnp_clipboard_selection_has_owner (Evas_Object *win)
	Determine whether the clipboard selection has an owner.
Eina_Bool	elm_drop_target_add (Evas_Object obj, Elm_Sel_Format format, Elm_Drag_State entercb, void enterdata, Elm_Drag_State leavecb, void leavedata, Elm_Drag_Pos poscb, void posdata, Elm_Drop_Cb dropcb, void *dropdata)
	Set the given object as a target for drops for drag-and-drop.
Eina_Bool	elm_drop_target_del (Evas_Object obj, Elm_Sel_Format format, Elm_Drag_State entercb, void enterdata, Elm_Drag_State leavecb, void leavedata, Elm_Drag_Pos poscb, void posdata, Elm_Drop_Cb dropcb, void *dropdata)
	Deletes the drop target status of an object.
Eina_Bool	elm_drag_start (Evas_Object obj, Elm_Sel_Format format, const char data, Elm_Xdnd_Action action, Elm_Drag_Icon_Create_Cb createicon, void createdata, Elm_Drag_Pos dragpos, void dragdata, Elm_Drag_Accept acceptcb, void acceptdata, Elm_Drag_State dragdone, void donecbdata)
	Begins a drag given a source object.
Eina_Bool	elm_drag_cancel (Evas_Object *obj)
	Cancels the current drag operation.
Eina_Bool	elm_drag_action_set (Evas_Object *obj, Elm_Xdnd_Action action)
	Changes the current drag action.
Eina_Bool	elm_drag_item_container_add (Evas_Object *obj, double tm_to_anim, double tm_to_drag, Elm_Xy_Item_Get_Cb itemgetcb, Elm_Item_Container_Data_Get_Cb data_get)
	Set a item container (list, genlist, grid) as source of drag.
Eina_Bool	elm_drag_item_container_del (Evas_Object *obj)
	Deletes a item container from drag-source list.
Eina_Bool	elm_drop_item_container_add (Evas_Object obj, Elm_Sel_Format format, Elm_Xy_Item_Get_Cb itemgetcb, Elm_Drag_State entercb, void enterdata, Elm_Drag_State leavecb, void leavedata, Elm_Drag_Item_Container_Pos poscb, void posdata, Elm_Drop_Item_Container_Cb dropcb, void *dropdata)
	Set a item container (list, genlist, grid) as target for drop.
Eina_Bool	elm_drop_item_container_del (Evas_Object *obj)
	Removes a container from list of drop targets.
Typedefs
typedef Efl_Selection_Type	Elm_Sel_Type
typedef Efl_Selection_Format	Elm_Sel_Format
typedef struct Elm_Cnp_Event_Selection_Changed	Elm_Cnp_Event_Selection_Changed
typedef Eina_Bool(*	Elm_Drop_Cb )(void data, Evas_Object obj, Elm_Selection_Data *ev)
typedef Elm_Object_Item (	Elm_Xy_Item_Get_Cb )(Evas_Object obj, Evas_Coord x, Evas_Coord y, int xposret, int *yposret)
typedef void(*	Elm_Selection_Loss_Cb )(void *data, Elm_Sel_Type selection)
typedef Evas_Object (	Elm_Drag_Icon_Create_Cb )(void data, Evas_Object win, Evas_Coord xoff, Evas_Coord yoff)
typedef void(*	Elm_Drag_State )(void data, Evas_Object obj)
typedef void(*	Elm_Drag_Done )(void data, Evas_Object obj, Eina_Bool accepted)
typedef void(*	Elm_Drag_Accept )(void data, Evas_Object obj, Eina_Bool doaccept)
typedef void(*	Elm_Drag_Pos )(void data, Evas_Object obj, Evas_Coord x, Evas_Coord y, Elm_Xdnd_Action action)
typedef void(*	Elm_Drag_Start )(void data, Evas_Object obj)
typedef void(*	Elm_Drag_Item_Container_Pos )(void data, Evas_Object cont, Elm_Object_Item *it, Evas_Coord x, Evas_Coord y, int xposret, int yposret, Elm_Xdnd_Action action)
typedef Eina_Bool(*	Elm_Drop_Item_Container_Cb )(void data, Evas_Object obj, Elm_Object_Item it, Elm_Selection_Data ev, int xposret, int yposret)
typedef struct _Elm_Drag_User_Info	Elm_Drag_User_Info
typedef Eina_Bool(*	Elm_Item_Container_Data_Get_Cb )(Evas_Object obj, Elm_Object_Item it, Elm_Drag_User_Info *info)

Typedef Documentation

typedef struct Elm_Cnp_Event_Selection_Changed Elm_Cnp_Event_Selection_Changed

Event to notify when a display server's selection has changed Only sent for PRIMARY and CLIPBOARD selections

Since (EFL) :: 1.20

typedef void(* Elm_Drag_Accept)(void *data, Evas_Object *obj, Eina_Bool doaccept)

Callback called when a drag is responded to with an accept or deny

Parameters:

data	Application specific data
obj	The object where the drag started
doaccept	A boolean as to if the target accepts the drag or not

Since (EFL) :: 1.8

typedef void(* Elm_Drag_Done)(void *data, Evas_Object *obj, Eina_Bool accepted)

Callback called when a drag is finished.

Parameters:

data	Application specific data
obj	The object where the drag started
accepted	TRUE if the droppped-data is accepted on drop

Since (EFL) :: 1.8

typedef Evas_Object*(* Elm_Drag_Icon_Create_Cb)(void *data, Evas_Object *win, Evas_Coord *xoff, Evas_Coord *yoff)

Callback called to create a drag icon object

Parameters:

data	Application specific data
win	The window to create the objects relative to
xoff	A return coordinate for the X offset at which to place the drag icon object relative to the source drag object
yoff	A return coordinate for the Y offset at which to place the drag icon object relative to the source drag object

Returns:: An object to fill the drag window with or NULL if not needed

Since (EFL) :: 1.8

typedef void(* Elm_Drag_Item_Container_Pos)(void *data, Evas_Object *cont, Elm_Object_Item *it, Evas_Coord x, Evas_Coord y, int xposret, int yposret, Elm_Xdnd_Action action)

Callback called when a drag is over an object

Parameters:

data	Application specific data
cont	The container object where the drag started
it	The object item in container where mouse-over
x	The X coordinate relative to the top-left of the object
y	The Y coordinate relative to the top-left of the object
xposret	Position relative to item (left (-1), middle (0), right (1)
yposret	Position relative to item (upper (-1), middle (0), bottom (1)
action	The drag action to be done

Since (EFL) :: 1.8

typedef void(* Elm_Drag_Pos)(void *data, Evas_Object *obj, Evas_Coord x, Evas_Coord y, Elm_Xdnd_Action action)

Callback called when a drag is over an object, and gives object-relative coordinates

Parameters:

data	Application specific data
obj	The object where the drag started
x	The X coordinate relative to the top-left of the object
y	The Y coordinate relative to the top-left of the object

Since (EFL) :: 1.8

typedef void(* Elm_Drag_Start)(void *data, Evas_Object *obj)

Callback called when a drag starts from an item container

Parameters:

data	Application specific data
obj	The object where the drag started

Since (EFL) :: 1.8

typedef void(* Elm_Drag_State)(void *data, Evas_Object *obj)

Callback called when a drag is finished, enters, or leaves an object

Parameters:

data	Application specific data
obj	The object where the drag started

Since (EFL) :: 1.8

typedef struct _Elm_Drag_User_Info Elm_Drag_User_Info

Structure describing user information for the drag process.

Parameters:

format	The drag formats supported by the data (output)
data	The drag data itself (a string) (output)
icons	if value not NULL, play default anim (output)
action	The drag action to be done (output)
createicon	Function to call to create a drag object, or NULL if not wanted (output)
createdata	Application data passed to `createicon` (output)
dragpos	Function called with each position of the drag, x, y being screen coordinates if possible, and action being the current action. (output)
dragdata	Application data passed to `dragpos` (output)
acceptcb	Function called indicating if drop target accepts (or does not) the drop data while dragging (output)
acceptdata	Application data passed to `acceptcb` (output)
dragdone	Function to call when drag is done (output)
donecbdata	Application data to pass to `dragdone` (output)

typedef Eina_Bool(* Elm_Drop_Cb)(void *data, Evas_Object *obj, Elm_Selection_Data *ev)

Callback invoked in when the selected data is 'dropped' at its destination.

Parameters:

data	Application specific data
obj	The evas object where selected data is 'dropped'.
ev	struct holding information about selected data FIXME: this should probably be a smart callback

typedef Eina_Bool(* Elm_Drop_Item_Container_Cb)(void *data, Evas_Object *obj, Elm_Object_Item *it, Elm_Selection_Data *ev, int xposret, int yposret)

Callback invoked in when the selected data is 'dropped' on container.

Parameters:

data	Application specific data
obj	The evas object where selected data is 'dropped'.
it	The item in container where drop-cords
ev	struct holding information about selected data
xposret	Position relative to item (left (-1), middle (0), right (1)
yposret	Position relative to item (upper (-1), middle (0), bottom (1)

typedef Eina_Bool(* Elm_Item_Container_Data_Get_Cb)(Evas_Object *obj, Elm_Object_Item *it, Elm_Drag_User_Info *info)

Callback invoked when starting to drag for a container.

Parameters:

obj	The container object
it	The Elm_Object_Item pointer where drag-start

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

typedef Efl_Selection_Format Elm_Sel_Format

Defines the types of content.

typedef Efl_Selection_Type Elm_Sel_Type

Defines the types of selection property names.

See also:: http://www.x.org/docs/X11/xlib.pdf for more details.

typedef void(* Elm_Selection_Loss_Cb)(void *data, Elm_Sel_Type selection)

Callback invoked in when the selection ownership for a given selection is lost.

Parameters:

data	Application specific data
selection	The selection that is lost

Since (EFL) :: 1.7

typedef Elm_Object_Item*(* Elm_Xy_Item_Get_Cb)(Evas_Object *obj, Evas_Coord x, Evas_Coord y, int *xposret, int *yposret)

Callback invoked to find out what object is under (x,y) coords

Parameters:

obj	The container object
x	cord to check
y	cord to check
xposret	Position relative to item (left (-1), middle (0), right (1)
yposret	Position relative to item (upper (-1), middle (0), bottom (1)

Returns:: object under x,y cords or NULL if not found.

Enumeration Type Documentation

enum Elm_Xdnd_Action

Defines the kind of action associated with the drop data if for XDND

Since (EFL) :: 1.8

Enumerator:

ELM_XDND_ACTION_UNKNOWN	Action type is unknown
ELM_XDND_ACTION_COPY	Copy the data
ELM_XDND_ACTION_MOVE	Move the data
ELM_XDND_ACTION_PRIVATE	Private action type
ELM_XDND_ACTION_ASK	Ask the user what to do
ELM_XDND_ACTION_LIST	List the data
ELM_XDND_ACTION_LINK	Link the data
ELM_XDND_ACTION_DESCRIPTION	Describe the data

Function Documentation

Eina_Bool elm_cnp_clipboard_selection_has_owner ( Evas_Object * win )

Determine whether the clipboard selection has an owner.

Parameters:

win	The window object to check for

Returns:: EINA_TRUE if the clipboard has a selection

Since (EFL) :: 1.20

Eina_Bool elm_cnp_selection_get	(	const Evas_Object *	obj,
		Elm_Sel_Type	selection,
		Elm_Sel_Format	format,
		Elm_Drop_Cb	datacb,
		void *	udata
	)

Get data from a widget that has a selection.

Get the current selection data from a widget. The widget input here will usually be elm_entry, in which case datacb and udata can be NULL. If a different widget is passed, datacb and udata are used for retrieving data.

See also:: also elm_cnp_selection_set()

Parameters:

selection	Selection type for copying and pasting
format	Selection format
obj	The source widget
datacb	The user data callback if the target widget isn't elm_entry
udata	The user data pointer for `datacb`

Returns:: If EINA_TRUE, getting selection data was successful.

Since :: 2.4

void elm_cnp_selection_loss_callback_set	(	Evas_Object *	obj,
		Elm_Sel_Type	selection,
		Elm_Selection_Loss_Cb	func,
		const void *	data
	)

Set a function to be called when a selection is lost.

The function func is set of be called when selection selection is lost to another process or when elm_cnp_selection_set() is called. If func is NULL then it is not called. data is passed as the data parameter to the callback functions and selection is passed in as the selection that has been lost.

elm_cnp_selection_set() and elm_object_cnp_selection_clear() automatically set this los callback to NULL when called. If you wish to take the selection and then be notified of loss please do this (for example):

 elm_cnp_selection_set(obj, ELM_SEL_TYPE_PRIMARY, ELM_SEL_FORMAT_TEXT, "hello", strlen(hello));
 elm_cnp_selection_loss_callback_set(obj, ELM_SEL_TYPE_PRIMARY, loss_cb, NULL);

See also:: also elm_cnp_selection_set()

Parameters:

obj	The object to indicate the window target/display system.
selection	Selection to be notified of for loss
func	The function to call
data	The data pointer passed to the function.

Since (EFL) :: 1.7

Since :: 2.4

Eina_Bool elm_cnp_selection_set	(	Evas_Object *	obj,
		Elm_Sel_Type	selection,
		Elm_Sel_Format	format,
		const void *	buf,
		size_t	buflen
	)

Set copy data for a widget.

Set copy data and take ownership of selection. Format is used for specifying the selection type, and this is used during pasting.

Parameters:

selection	Selection type for copying and pasting
obj	The source widget pointer
format	Selection format
buf	The data selected
buflen	The size of `buf`

Returns:: If EINA_TRUE, setting data was successful.

Since :: 2.4

Eina_Bool elm_drag_action_set	(	Evas_Object *	obj,
		Elm_Xdnd_Action	action
	)

Changes the current drag action.

Parameters:

obj	The source of a drag if a drag is underway
action	The drag action to be done

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

Since (EFL) :: 1.8

Since :: 2.4

Eina_Bool elm_drag_cancel ( Evas_Object * obj )

Cancels the current drag operation.

It can only be initiated from the source window.

Parameters:

obj	The source of the current drag.

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

Since (EFL) :: 1.9

Since :: 2.4

Eina_Bool elm_drag_item_container_add	(	Evas_Object *	obj,
		double	tm_to_anim,
		double	tm_to_drag,
		Elm_Xy_Item_Get_Cb	itemgetcb,
		Elm_Item_Container_Data_Get_Cb	data_get
	)

Set a item container (list, genlist, grid) as source of drag.

Parameters:

obj	The container object.
tm_to_anim	Time period to wait before start animation.
tm_to_drag	Time period to wait before start dragging.
itemgetcb	Callback to get Evas_Object pointer for item at (x,y)
data_get	Callback to get drag info

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

Since (EFL) :: 1.8

Since :: 2.4

Eina_Bool elm_drag_item_container_del ( Evas_Object * obj )

Deletes a item container from drag-source list.

Parameters:

obj	The target object

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

Since (EFL) :: 1.8

Since :: 2.4

Eina_Bool elm_drag_start	(	Evas_Object *	obj,
		Elm_Sel_Format	format,
		const char *	data,
		Elm_Xdnd_Action	action,
		Elm_Drag_Icon_Create_Cb	createicon,
		void *	createdata,
		Elm_Drag_Pos	dragpos,
		void *	dragdata,
		Elm_Drag_Accept	acceptcb,
		void *	acceptdata,
		Elm_Drag_State	dragdone,
		void *	donecbdata
	)

Begins a drag given a source object.

Parameters:

obj	The source object
format	The drag formats supported by the data
data	The drag data itself (a string)
action	The drag action to be done
createicon	Function to call to create a drag object, or NULL if not wanted
createdata	Application data passed to `createicon`
dragpos	Function called with each position of the drag, x, y being screen coordinates if possible, and action being the current action.
dragdata	Application data passed to `dragpos`
acceptcb	Function called indicating if drop target accepts (or does not) the drop data while dragging
acceptdata	Application data passed to `acceptcb`
dragdone	Function to call when drag is done
donecbdata	Application data to pass to `dragdone`

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

Since (EFL) :: 1.8

Since :: 2.4

Eina_Bool elm_drop_item_container_add	(	Evas_Object *	obj,
		Elm_Sel_Format	format,
		Elm_Xy_Item_Get_Cb	itemgetcb,
		Elm_Drag_State	entercb,
		void *	enterdata,
		Elm_Drag_State	leavecb,
		void *	leavedata,
		Elm_Drag_Item_Container_Pos	poscb,
		void *	posdata,
		Elm_Drop_Item_Container_Cb	dropcb,
		void *	dropdata
	)

Set a item container (list, genlist, grid) as target for drop.

Parameters:

obj	The container object.
format	The formats supported for dropping
itemgetcb	Callback to get Evas_Object pointer for item at (x,y)
entercb	The function to call when the object is entered with a drag
enterdata	The application data to pass to enterdata
leavecb	The function to call when the object is left with a drag
leavedata	The application data to pass to leavedata
poscb	The function to call when the object has a drag over it
posdata	The application data to pass to posdata
dropcb	The function to call when a drop has occurred
dropdata	The application data to pass to dropcb

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

Since (EFL) :: 1.8

Since :: 2.4

Eina_Bool elm_drop_item_container_del ( Evas_Object * obj )

Removes a container from list of drop targets.

Parameters:

obj	The container object

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

Since (EFL) :: 1.8

Since :: 2.4

Eina_Bool elm_drop_target_add	(	Evas_Object *	obj,
		Elm_Sel_Format	format,
		Elm_Drag_State	entercb,
		void *	enterdata,
		Elm_Drag_State	leavecb,
		void *	leavedata,
		Elm_Drag_Pos	poscb,
		void *	posdata,
		Elm_Drop_Cb	dropcb,
		void *	dropdata
	)

Set the given object as a target for drops for drag-and-drop.

Parameters:

obj	The target object
format	The formats supported for dropping
entercb	The function to call when the object is entered with a drag
enterdata	The application data to pass to enterdata
leavecb	The function to call when the object is left with a drag
leavedata	The application data to pass to leavedata
poscb	The function to call when the object has a drag over it
posdata	The application data to pass to posdata
dropcb	The function to call when a drop has occurred
dropdata	The application data to pass to dropcb

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

Since (EFL) :: 1.8

Since :: 2.4

Eina_Bool elm_drop_target_del	(	Evas_Object *	obj,
		Elm_Sel_Format	format,
		Elm_Drag_State	entercb,
		void *	enterdata,
		Elm_Drag_State	leavecb,
		void *	leavedata,
		Elm_Drag_Pos	poscb,
		void *	posdata,
		Elm_Drop_Cb	dropcb,
		void *	dropdata
	)

Deletes the drop target status of an object.

Parameters:

obj	The target object
format	The formats supported for dropping
entercb	The function to call when the object is entered with a drag
enterdata	The application data to pass to enterdata
leavecb	The function to call when the object is left with a drag
leavedata	The application data to pass to leavedata
poscb	The function to call when the object has a drag over it
posdata	The application data to pass to posdata
dropcb	The function to call when a drop has occurred
dropdata	The application data to pass to dropcb

Returns:: Returns EINA_TRUE, if successful, or EINA_FALSE if not.

Since (EFL) :: 1.8

Since :: 2.4

Eina_Bool elm_object_cnp_selection_clear	(	Evas_Object *	obj,
		Elm_Sel_Type	selection
	)

Clear the selection data of a widget.

Clear all data from the selection which is owned by a widget.

See also:: also elm_cnp_selection_set()

Parameters:

obj	The source widget
selection	Selection type for copying and pasting

Returns:: If EINA_TRUE, clearing data was successful.

Since :: 2.4

Variable Documentation

int ELM_CNP_EVENT_SELECTION_CHANGED

Event notifying that the selection has changed

See also:: Elm_Cnp_Event_Selection_Changed

Since (EFL) :: 1.20

Functions

Typedefs

Typedef Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation