Class: Gdk::Drag

Inherits:
Object
  • Object
show all
Defined in:
(unknown)

Overview

The GdkDrag object represents the source of an ongoing DND operation.

A GdkDrag is created when a drag is started, and stays alive for duration of
the DND operation. After a drag has been started with [funcGdk.Drag.begin],
the caller gets informed about the status of the ongoing drag operation
with signals on the GdkDrag object.

GTK provides a higher level abstraction based on top of these functions,
and so they are not normally needed in GTK applications. See the
"Drag and Drop" section of the GTK documentation for more information.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.begin(surface, device, content, actions, dx, dy) ⇒ Gdk::Drag

Starts a drag and creates a new drag context for it.

This function is called by the drag source. After this call, you
probably want to set up the drag icon using the surface returned
by [methodGdk.Drag.get_drag_surface].

This function returns a reference to the [classGdk.Drag] object,
but GTK keeps its own reference as well, as long as the DND operation
is going on.

Note: if actions include %GDK_ACTION_MOVE, you need to listen for
the [signalGdk.Drag::dnd-finished] signal and delete the data at
the source if [methodGdk.Drag.get_selected_action] returns
%GDK_ACTION_MOVE.

Parameters:

  • surface (Gdk::Surface) —

    the source surface for this drag

  • device (Gdk::Device) —

    the device that controls this drag

  • content (Gdk::ContentProvider) —

    the offered content

  • actions (Gdk::DragAction) —

    the actions supported by this drag

  • dx (Float) —

    the x offset to device's position where the drag nominally started

  • dy (Float) —

    the y offset to device's position where the drag nominally started

Returns:

Instance Method Details

#actions ⇒ Gdk::DragAction

The possible actions of this drag.

Returns:

#actions=(actions) ⇒ Gdk::DragAction

The possible actions of this drag.

Parameters:

Returns:

#content ⇒ Gdk::ContentProvider

The GdkContentProvider.

Returns:

#content=(content) ⇒ Gdk::ContentProvider

The GdkContentProvider.

Parameters:

Returns:

#device ⇒ Gdk::Device

The GdkDevice that is performing the drag.

Returns:

#device=(device) ⇒ Gdk::Device

The GdkDevice that is performing the drag.

Parameters:

Returns:

#display ⇒ Gdk::Display

The GdkDisplay that the drag belongs to.

Returns:

#display=(display) ⇒ Gdk::Display

The GdkDisplay that the drag belongs to.

Parameters:

Returns:

#drag_surface ⇒ Gdk::Surface

Returns the surface on which the drag icon should be rendered
during the drag operation.

Note that the surface may not be available until the drag operation
has begun. GDK will move the surface in accordance with the ongoing
drag operation. The surface is owned by drag and will be destroyed
when the drag operation is over.

Returns:

#drop_done(success) ⇒ nil

Informs GDK that the drop ended.

Passing false for success may trigger a drag cancellation
animation.

This function is called by the drag source, and should be the
last call before dropping the reference to the drag.

The GdkDrag will only take the first [methodGdk.Drag.drop_done]
call as effective, if this function is called multiple times,
all subsequent calls will be ignored.

Parameters:

  • success (Boolean) —

    whether the drag was ultimatively successful

Returns:

  • (nil)

#formats ⇒ Gdk::ContentFormats

The possible formats that the drag can provide its data in.

Returns:

  • (Gdk::ContentFormats) —

    formats

#formats=(formats) ⇒ Gdk::ContentFormats

The possible formats that the drag can provide its data in.

Parameters:

  • formats (Gdk::ContentFormats)

Returns:

  • (Gdk::ContentFormats) —

    formats

  • (Gdk::ContentFormats) —

    formats

#selected_action ⇒ Gdk::DragAction

The currently selected action of the drag.

Returns:

#selected_action=(selected_action) ⇒ Gdk::DragAction

The currently selected action of the drag.

Parameters:

Returns:

#set_hotspot(hot_x, hot_y) ⇒ nil

Sets the position of the drag surface that will be kept
under the cursor hotspot.

Initially, the hotspot is at the top left corner of the drag surface.

Parameters:

  • hot_x (Integer) —

    x coordinate of the drag surface hotspot

  • hot_y (Integer) —

    y coordinate of the drag surface hotspot

Returns:

  • (nil)

#surface ⇒ Gdk::Surface

The surface where the drag originates.

Returns:

#surface=(surface) ⇒ Gdk::Surface

The surface where the drag originates.

Parameters:

Returns: