gtk/gdk/gdkdnd.c
2014-01-20 18:27:29 -05:00

458 lines
12 KiB
C

/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gdkdndprivate.h"
#include "gdkdisplay.h"
#include "gdkwindow.h"
/**
* SECTION:dnd
* @title: Drag And Drop
* @short_description: Functions for controlling drag and drop handling
*
* These functions provide a low level interface for drag and drop.
* The X backend of GDK supports both the Xdnd and Motif drag and drop
* protocols transparently, the Win32 backend supports the WM_DROPFILES
* protocol.
*
* GTK+ provides a higher level abstraction based on top of these functions,
* and so they are not normally needed in GTK+ applications.
* See the <link linkend="gtk-Drag-and-Drop">Drag and Drop</link> section of
* the GTK+ documentation for more information.
*/
/**
* gdk_drag_context_list_targets:
* @context: a #GdkDragContext
*
* Retrieves the list of targets of the context.
*
* Return value: (transfer none) (element-type GdkAtom): a #GList of targets
*
* Since: 2.22
**/
GList *
gdk_drag_context_list_targets (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
return context->targets;
}
/**
* gdk_drag_context_get_actions:
* @context: a #GdkDragContext
*
* Determines the bitmask of actions proposed by the source if
* gdk_drag_context_get_suggested_action() returns GDK_ACTION_ASK.
*
* Return value: the #GdkDragAction flags
*
* Since: 2.22
**/
GdkDragAction
gdk_drag_context_get_actions (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), GDK_ACTION_DEFAULT);
return context->actions;
}
/**
* gdk_drag_context_get_suggested_action:
* @context: a #GdkDragContext
*
* Determines the suggested drag action of the context.
*
* Return value: a #GdkDragAction value
*
* Since: 2.22
**/
GdkDragAction
gdk_drag_context_get_suggested_action (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), 0);
return context->suggested_action;
}
/**
* gdk_drag_context_get_selected_action:
* @context: a #GdkDragContext
*
* Determines the action chosen by the drag destination.
*
* Return value: a #GdkDragAction value
*
* Since: 2.22
**/
GdkDragAction
gdk_drag_context_get_selected_action (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), 0);
return context->action;
}
/**
* gdk_drag_context_get_source_window:
* @context: a #GdkDragContext
*
* Returns the #GdkWindow where the DND operation started.
*
* Return value: (transfer none): a #GdkWindow
*
* Since: 2.22
**/
GdkWindow *
gdk_drag_context_get_source_window (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
return context->source_window;
}
/**
* gdk_drag_context_get_dest_window:
* @context: a #GdkDragContext
*
* Returns the destination windw for the DND operation.
*
* Return value: (transfer none): a #GdkWindow
*
* Since: 3.0
**/
GdkWindow *
gdk_drag_context_get_dest_window (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
return context->dest_window;
}
/**
* gdk_drag_context_get_protocol:
* @context: a #GdkDragContext
*
* Returns the drag protocol thats used by this context.
*
* Returns: the drag protocol
*
* Since: 3.0
*/
GdkDragProtocol
gdk_drag_context_get_protocol (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), GDK_DRAG_PROTO_NONE);
return context->protocol;
}
/**
* gdk_drag_context_set_device:
* @context: a #GdkDragContext
* @device: a #GdkDevice
*
* Associates a #GdkDevice to @context, so all Drag and Drop events
* for @context are emitted as if they came from this device.
*/
void
gdk_drag_context_set_device (GdkDragContext *context,
GdkDevice *device)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (GDK_IS_DEVICE (device));
if (context->device)
g_object_unref (context->device);
context->device = device;
if (context->device)
g_object_ref (context->device);
}
/**
* gdk_drag_context_get_device:
* @context: a #GdkDragContext
*
* Returns the #GdkDevice associated to the drag context.
*
* Returns: (transfer none): The #GdkDevice associated to @context.
**/
GdkDevice *
gdk_drag_context_get_device (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
return context->device;
}
G_DEFINE_TYPE (GdkDragContext, gdk_drag_context, G_TYPE_OBJECT)
static void
gdk_drag_context_init (GdkDragContext *context)
{
}
static void
gdk_drag_context_finalize (GObject *object)
{
GdkDragContext *context = GDK_DRAG_CONTEXT (object);
g_list_free (context->targets);
if (context->source_window)
g_object_unref (context->source_window);
if (context->dest_window)
g_object_unref (context->dest_window);
G_OBJECT_CLASS (gdk_drag_context_parent_class)->finalize (object);
}
static void
gdk_drag_context_class_init (GdkDragContextClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gdk_drag_context_finalize;
}
/**
* gdk_drag_find_window_for_screen:
* @context: a #GdkDragContext
* @drag_window: a window which may be at the pointer position, but
* should be ignored, since it is put up by the drag source as an icon
* @screen: the screen where the destination window is sought
* @x_root: the x position of the pointer in root coordinates
* @y_root: the y position of the pointer in root coordinates
* @dest_window: (out): location to store the destination window in
* @protocol: (out): location to store the DND protocol in
*
* Finds the destination window and DND protocol to use at the
* given pointer position.
*
* This function is called by the drag source to obtain the
* @dest_window and @protocol parameters for gdk_drag_motion().
*
* Since: 2.2
*/
void
gdk_drag_find_window_for_screen (GdkDragContext *context,
GdkWindow *drag_window,
GdkScreen *screen,
gint x_root,
gint y_root,
GdkWindow **dest_window,
GdkDragProtocol *protocol)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
*dest_window = GDK_DRAG_CONTEXT_GET_CLASS (context)
->find_window (context, drag_window, screen, x_root, y_root, protocol);
}
/**
* gdk_drag_status:
* @context: a #GdkDragContext
* @action: the selected action which will be taken when a drop happens,
* or 0 to indicate that a drop will not be accepted
* @time_: the timestamp for this operation
*
* Selects one of the actions offered by the drag source.
*
* This function is called by the drag destination in response to
* gdk_drag_motion() called by the drag source.
*/
void
gdk_drag_status (GdkDragContext *context,
GdkDragAction action,
guint32 time_)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
GDK_DRAG_CONTEXT_GET_CLASS (context)->drag_status (context, action, time_);
}
/**
* gdk_drag_motion:
* @context: a #GdkDragContext
* @dest_window: the new destination window, obtained by
* gdk_drag_find_window()
* @protocol: the DND protocol in use, obtained by gdk_drag_find_window()
* @x_root: the x position of the pointer in root coordinates
* @y_root: the y position of the pointer in root coordinates
* @suggested_action: the suggested action
* @possible_actions: the possible actions
* @time_: the timestamp for this operation
*
* Updates the drag context when the pointer moves or the
* set of actions changes.
*
* This function is called by the drag source.
*
* Returns:
*/
gboolean
gdk_drag_motion (GdkDragContext *context,
GdkWindow *dest_window,
GdkDragProtocol protocol,
gint x_root,
gint y_root,
GdkDragAction suggested_action,
GdkDragAction possible_actions,
guint32 time_)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), FALSE);
return GDK_DRAG_CONTEXT_GET_CLASS (context)
->drag_motion (context,
dest_window,
protocol,
x_root,
y_root,
suggested_action,
possible_actions,
time_);
}
/**
* gdk_drag_abort:
* @context: a #GdkDragContext
* @time_: the timestamp for this operation
*
* Aborts a drag without dropping.
*
* This function is called by the drag source.
*/
void
gdk_drag_abort (GdkDragContext *context,
guint32 time_)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
GDK_DRAG_CONTEXT_GET_CLASS (context)->drag_abort (context, time_);
}
/**
* gdk_drag_drop:
* @context: a #GdkDragContext
* @time_: the timestamp for this operation
*
* Drops on the current destination.
*
* This function is called by the drag source.
*/
void
gdk_drag_drop (GdkDragContext *context,
guint32 time_)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
GDK_DRAG_CONTEXT_GET_CLASS (context)->drag_drop (context, time_);
}
/**
* gdk_drop_reply:
* @context: a #GdkDragContext
* @accepted: %TRUE if the drop is accepted
* @time_: the timestamp for this operation
*
* Accepts or rejects a drop.
*
* This function is called by the drag destination in response
* to a drop initiated by the drag source.
*/
void
gdk_drop_reply (GdkDragContext *context,
gboolean accepted,
guint32 time_)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
GDK_DRAG_CONTEXT_GET_CLASS (context)->drop_reply (context, accepted, time_);
}
/**
* gdk_drop_finish:
* @context: a #GdkDragContext
* @success: %TRUE if the data was successfully received
* @time_: the timestamp for this operation
*
* Ends the drag operation after a drop.
*
* This function is called by the drag destination.
*/
void
gdk_drop_finish (GdkDragContext *context,
gboolean success,
guint32 time_)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
GDK_DRAG_CONTEXT_GET_CLASS (context)->drop_finish (context, success, time_);
}
/**
* gdk_drag_drop_succeeded:
* @context: a #GdkDragContext
*
* Returns whether the dropped data has been successfully
* transferred. This function is intended to be used while
* handling a %GDK_DROP_FINISHED event, its return value is
* meaningless at other times.
*
* Return value: %TRUE if the drop was successful.
*
* Since: 2.6
**/
gboolean
gdk_drag_drop_succeeded (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), FALSE);
return GDK_DRAG_CONTEXT_GET_CLASS (context)->drop_status (context);
}
/**
* gdk_drag_get_selection:
* @context: a #GdkDragContext.
*
* Returns the selection atom for the current source window.
*
* Return value: (transfer none): the selection atom, or %GDK_NONE
*/
GdkAtom
gdk_drag_get_selection (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), GDK_NONE);
g_return_val_if_fail (context->source_window != NULL, GDK_NONE);
return GDK_DRAG_CONTEXT_GET_CLASS (context)->get_selection (context);
}