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wayland: Implement support for the x-rootwindow-drop target

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This target is set whenever DnD moves towards an area between surfaces.
Although no offer is set and data is actually not read, drag sources
offering this mimetype will be able to behave just like they used to
do in X11.

https://bugzilla.gnome.org/show_bug.cgi?id=762104
This commit is contained in:
Carlos Garnacho 2016-03-09 16:53:26 +01:00
parent 51e4491a9f
commit 3d67bfda14
1 changed files with 83 additions and 0 deletions
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83
src/wayland/meta-wayland-data-device.c
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@ -29,6 +29,7 @@
#include <unistd.h>
#include <stdio.h>
#include <glib.h>
#include <glib-unix.h>
#include "meta-wayland-data-device.h"
#include "meta-wayland-data-device-private.h"
@ -39,6 +40,8 @@
#include "gtk-primary-selection-server-protocol.h"
#define ROOTWINDOW_DROP_MIME "application/x-rootwindow-drop"
#define ALL_ACTIONS (WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY | \
WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE | \
WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK)
@ -726,6 +729,30 @@ meta_wayland_drag_grab_set_source (MetaWaylandDragGrab *drag_grab,
drag_grab);
}
static void
meta_wayland_drag_source_fake_acceptance (MetaWaylandDataSource *source,
const gchar *mimetype)
{
uint32_t actions, user_action, action = 0;
actions = meta_wayland_data_source_get_actions (source);
user_action = meta_wayland_data_source_get_user_action (source);
/* Pick a suitable action */
if ((user_action & actions) != 0)
action = user_action;
else if (actions != 0)
action = 1 << (ffs (actions) - 1);
/* Bail out if there is none, source didn't cooperate */
if (action == 0)
return;
meta_wayland_data_source_target (source, mimetype);
meta_wayland_data_source_set_current_action (source, action);
meta_wayland_data_source_set_has_target (source, TRUE);
}
void
meta_wayland_drag_grab_set_focus (MetaWaylandDragGrab *drag_grab,
MetaWaylandSurface *surface)
@ -750,6 +777,12 @@ meta_wayland_drag_grab_set_focus (MetaWaylandDragGrab *drag_grab,
if (source)
meta_wayland_data_source_set_current_offer (source, NULL);
if (!surface && source &&
meta_wayland_data_source_has_mime_type (source, ROOTWINDOW_DROP_MIME))
meta_wayland_drag_source_fake_acceptance (source, ROOTWINDOW_DROP_MIME);
else if (source)
meta_wayland_data_source_target (source, NULL);
if (!surface)
return;
@ -855,6 +888,47 @@ data_device_end_drag_grab (MetaWaylandDragGrab *drag_grab)
g_slice_free (MetaWaylandDragGrab, drag_grab);
}
static gboolean
on_fake_read_hup (GIOChannel *channel,
GIOCondition condition,
gpointer data)
{
MetaWaylandDataSource *source = data;
meta_wayland_data_source_notify_finish (source);
g_io_channel_shutdown (channel, FALSE, NULL);
g_io_channel_unref (channel);
return G_SOURCE_REMOVE;
}
static void
meta_wayland_data_source_fake_read (MetaWaylandDataSource *source,
const gchar *mimetype)
{
GIOChannel *channel;
int p[2];
if (!g_unix_open_pipe (p, FD_CLOEXEC, NULL))
{
meta_wayland_data_source_notify_finish (source);
return;
}
if (!g_unix_set_fd_nonblocking (p[0], TRUE, NULL) ||
!g_unix_set_fd_nonblocking (p[1], TRUE, NULL))
{
meta_wayland_data_source_notify_finish (source);
close (p[0]);
close (p[1]);
return;
}
meta_wayland_data_source_send (source, mimetype, p[1]);
channel = g_io_channel_unix_new (p[0]);
g_io_add_watch (channel, G_IO_HUP, on_fake_read_hup, source);
}
static void
drag_grab_button (MetaWaylandPointerGrab *grab,
const ClutterEvent *event)
@ -883,6 +957,15 @@ drag_grab_button (MetaWaylandPointerGrab *grab,
meta_wayland_source_update_in_ask (source);
success = TRUE;
}
else if (!drag_grab->drag_focus && source &&
meta_wayland_data_source_has_target (source) &&
meta_wayland_data_source_get_current_action (source) &&
meta_wayland_data_source_has_mime_type (source, ROOTWINDOW_DROP_MIME))
{
/* Perform a fake read, that will lead to notify_finish() being called */
meta_wayland_data_source_fake_read (source, ROOTWINDOW_DROP_MIME);
success = TRUE;
}
else
{
meta_wayland_data_source_cancel (source);