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CopyPaste
Elementary

Copy and paste feature implementations. More...

## Data Structures
struct | _Elm_Selection_Data
| Structure holding the info about selected data. More...
struct | Elm_Cnp_Event_Selection_Changed
| Event to notify when a display server's selection has changed Only sent for PRIMARY and CLIPBOARD selections. More...
struct | _Elm_Drag_User_Info

## Typedefs
typedef struct _Elm_Selection_Data | Elm_Selection_Data
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.
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.
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.
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.
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.
typedef void(* | Elm_Drag_State) (void *data, Evas_Object *obj)
| Callback called when a drag is finished, enters, or leaves an object.
typedef void(* | Elm_Drag_Done) (void *data, Evas_Object *obj, Eina_Bool accepted)
| Callback called when a drag is finished.
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.
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.
typedef void(* | Elm_Drag_Start) (void *data, Evas_Object *obj)
| Callback called when a drag starts from an item container.
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.
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.
typedef struct _Elm_Drag_User_Info | Elm_Drag_User_Info
| Structure describing user information for the drag process.
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.

## Enumerations
enum | Elm_Sel_Type { ELM_SEL_TYPE_PRIMARY = 0 , ELM_SEL_TYPE_SECONDARY , ELM_SEL_TYPE_XDND , ELM_SEL_TYPE_CLIPBOARD }
| Defines the types of selection property names. More...
enum | Elm_Sel_Format { ELM_SEL_FORMAT_TARGETS = -1 , ELM_SEL_FORMAT_NONE = 0 , ELM_SEL_FORMAT_TEXT = 1 , ELM_SEL_FORMAT_MARKUP = 2 , ELM_SEL_FORMAT_IMAGE = 4 , ELM_SEL_FORMAT_VCARD = 8 , ELM_SEL_FORMAT_HTML = 16 }
| Defines the types of content. More...
enum | Elm_Xdnd_Action { ELM_XDND_ACTION_UNKNOWN = 0 , ELM_XDND_ACTION_COPY , ELM_XDND_ACTION_MOVE , ELM_XDND_ACTION_PRIVATE , ELM_XDND_ACTION_ASK , ELM_XDND_ACTION_LIST , ELM_XDND_ACTION_LINK , ELM_XDND_ACTION_DESCRIPTION }
| Defines the kind of action associated with the drop data if for XDND. More...

## 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.

## Variables
int | ELM_CNP_EVENT_SELECTION_CHANGED
| Event notifying that the selection has changed.

## Detailed Description

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.

## Typedef Documentation

## ◆ Elm_Cnp_Event_Selection_Changed

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
  1.20

## ◆ Elm_Drop_Cb

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

## ◆ Elm_Xy_Item_Get_Cb

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.

## ◆ Elm_Selection_Loss_Cb

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
  1.7

## ◆ Elm_Drag_Icon_Create_Cb

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
  1.8

## ◆ Elm_Drag_State

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
  1.8

## ◆ Elm_Drag_Done

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 dropped data is accepted on drop

Since
  1.8

## ◆ Elm_Drag_Accept

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
  1.8

## ◆ Elm_Drag_Pos

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
  1.8

## ◆ Elm_Drag_Start

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
  1.8

## ◆ Elm_Drag_Item_Container_Pos

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
  1.8

## ◆ Elm_Drop_Item_Container_Cb

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)

## ◆ Elm_Drag_User_Info

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)

## ◆ Elm_Item_Container_Data_Get_Cb

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.

## Enumeration Type Documentation

## ◆ Elm_Sel_Type

enum Elm_Sel_Type

Defines the types of selection property names.

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

Enumerator
ELM_SEL_TYPE_PRIMARY | Primary text selection (highlighted or selected text)
ELM_SEL_TYPE_SECONDARY | Used when primary selection is in use.
ELM_SEL_TYPE_XDND | Drag and Drop.
ELM_SEL_TYPE_CLIPBOARD | Clipboard selection (ctrl+C)

## ◆ Elm_Sel_Format

enum Elm_Sel_Format

Defines the types of content.

Enumerator
ELM_SEL_FORMAT_TARGETS | For matching every possible atom.
ELM_SEL_FORMAT_NONE | Content is from outside of Elementary.
ELM_SEL_FORMAT_TEXT | Plain unformatted text: Used for things that don't want rich markup.
ELM_SEL_FORMAT_MARKUP | Edje textblock markup, including inline images.
ELM_SEL_FORMAT_IMAGE | Images.
ELM_SEL_FORMAT_VCARD | Vcards.
ELM_SEL_FORMAT_HTML | Raw HTML-like data (eg. webkit)

## ◆ Elm_Xdnd_Action

enum Elm_Xdnd_Action

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

Since
  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

## ◆ elm_cnp_selection_set()

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.

References ecore_evas_ecore_evas_get(), ecore_evas_selection_set(), eina_array_count(), eina_array_data_get(), eina_array_free(), EINA_FALSE, eina_memdup(), EINA_TRUE, ELM_SEL_FORMAT_IMAGE, ELM_SEL_FORMAT_TEXT, evas_object_evas_get(), _Eina_Slice::len, and _Eina_Slice::mem.

Referenced by elm_code_widget_selection_copy(), and elm_code_widget_selection_cut().

## ◆ elm_cnp_selection_get()

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.

References ecore_evas_ecore_evas_get(), ecore_evas_selection_get(), eina_array_iterator_new(), EINA_TRUE, and evas_object_evas_get().

Referenced by elm_code_widget_selection_paste().

## ◆ elm_object_cnp_selection_clear()

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.

References ecore_evas_ecore_evas_get(), ecore_evas_selection_set(), and evas_object_evas_get().

## ◆ elm_cnp_selection_loss_callback_set()

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);
elm_cnp_selection_set
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.
Definition: elm_cnp.c:119
elm_cnp_selection_loss_callback_set
void elm_cnp_selection_loss_callback_set(Evas_Object *obj, Elm_Sel_Type type, Elm_Selection_Loss_Cb func, const void *data)
Set a function to be called when a selection is lost.
Definition: elm_cnp.c:229
ELM_SEL_FORMAT_TEXT
@ ELM_SEL_FORMAT_TEXT
Plain unformatted text: Used for things that don't want rich markup.
Definition: elm_cnp.h:77
ELM_SEL_TYPE_PRIMARY
@ ELM_SEL_TYPE_PRIMARY
Primary text selection (highlighted or selected text)
Definition: elm_cnp.h:61

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
  1.7

Referenced by elm_code_widget_selection_copy(), and elm_code_widget_selection_cut().

## ◆ elm_cnp_clipboard_selection_has_owner()

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
  1.20

References ecore_evas_ecore_evas_get(), ECORE_EVAS_SELECTION_BUFFER_COPY_AND_PASTE_BUFFER, ecore_evas_selection_exists(), and evas_object_evas_get().

## ◆ elm_drop_target_add()

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
  1.8

References EINA_FALSE, eina_hash_list_append(), eina_hash_pointer_new(), EINA_SAFETY_ON_NULL_RETURN_VAL, and EINA_TRUE.

Referenced by elm_drop_item_container_add().

## ◆ elm_drop_target_del()

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
  1.8

References eina_array_free(), EINA_FALSE, eina_hash_find(), eina_hash_list_remove(), EINA_LIST_FOREACH, EINA_SAFETY_ON_NULL_RETURN_VAL, and EINA_TRUE.

## ◆ elm_drag_start()

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
  1.8

References eina_array_count(), eina_array_data_get(), eina_array_free(), EINA_FALSE, EINA_SAFETY_ON_NULL_RETURN_VAL, EINA_SIZE2D, EINA_SLICE_STR_FULL, EINA_TRUE, evas_object_geometry_get(), and evas_object_show().

## ◆ elm_drag_cancel()

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
  1.9

References EINA_TRUE.

## ◆ elm_drag_action_set()

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
  1.8

References EINA_FALSE.

## ◆ elm_drag_item_container_add()

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
  1.8

References EINA_FALSE, eina_list_append(), eina_list_search_unsorted(), EINA_TRUE, EVAS_CALLBACK_MOUSE_DOWN, and evas_object_event_callback_add().

## ◆ elm_drag_item_container_del()

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
  1.8

References EINA_TRUE.

## ◆ elm_drop_item_container_add()

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
  1.8

References EINA_FALSE, eina_list_append(), eina_list_search_unsorted(), EINA_TRUE, and elm_drop_target_add().

## ◆ elm_drop_item_container_del()

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
  1.8

References EINA_TRUE.

## Variable Documentation

## ◆ ELM_CNP_EVENT_SELECTION_CHANGED

int ELM_CNP_EVENT_SELECTION_CHANGED
| extern

Event notifying that the selection has changed.

See also
  Elm_Cnp_Event_Selection_Changed

Since
  1.20

Referenced by elm_init().