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wayland: Implement drag sources

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The wl_data_source is retrieved from the selection object for the DnD
selection, and used to initiate a drag. When the drag is finished, a
button release or touch end event is synthesized to finish the DnD
operation after the compositor grab is gone.

https://bugzilla.gnome.org/show_bug.cgi?id=697855
This commit is contained in:
Carlos Garnacho
2014-08-21 21:30:22 +02:00
parent 9b0b88d16b
commit 7b85a3417a
4 changed files with 203 additions and 6 deletions
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147
gdk/wayland/gdkdnd-wayland.c
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@ -40,6 +40,9 @@ typedef struct _GdkWaylandDragContextClass GdkWaylandDragContextClass;
struct _GdkWaylandDragContext
{
GdkDragContext context;
GdkWindow *dnd_window;
struct wl_surface *dnd_surface;
struct wl_data_source *data_source;
struct wl_data_offer *offer;
uint32_t serial;
gdouble x;
@ -63,6 +66,10 @@ gdk_wayland_drag_context_finalize (GObject *object)
contexts = g_list_remove (contexts, context);
if (context->is_source &&
gdk_selection_owner_get (gdk_drag_get_selection (context)) == context->source_window)
gdk_wayland_selection_unset_data_source (gdk_drag_get_selection (context));
if (wayland_context->data_source)
wl_data_source_destroy (wayland_context->data_source);
@ -232,6 +239,8 @@ gdk_wayland_drag_context_drop_finish (GdkDragContext *context,
gboolean success,
guint32 time)
{
if (gdk_selection_owner_get (gdk_drag_get_selection (context)))
gdk_wayland_selection_unset_data_source (gdk_drag_get_selection (context));
}
static gboolean
@ -289,18 +298,63 @@ _gdk_wayland_window_register_dnd (GdkWindow *window)
{
}
static GdkWindow *
create_dnd_window (void)
{
GdkWindowAttr attrs;
GdkScreen *screen;
guint mask;
screen = gdk_display_get_default_screen (gdk_display_get_default ());
attrs.x = attrs.y = 0;
attrs.width = attrs.height = 100;
attrs.wclass = GDK_INPUT_OUTPUT;
attrs.window_type = GDK_WINDOW_TEMP;
attrs.type_hint = GDK_WINDOW_TYPE_HINT_DND;
attrs.visual = gdk_screen_get_system_visual (screen);
mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_TYPE_HINT;
return gdk_window_new (gdk_screen_get_root_window (screen), &attrs, mask);
}
GdkDragContext *
_gdk_wayland_window_drag_begin (GdkWindow *window,
GdkDevice *device,
GList *targets)
{
GdkWaylandDragContext *context_wayland;
GdkWaylandDisplay *display_wayland;
GdkDragContext *context;
GdkWindow *toplevel;
GList *l;
context = (GdkDragContext *) g_object_new (GDK_TYPE_WAYLAND_DRAG_CONTEXT, NULL);
context->source_window = window;
toplevel = gdk_device_get_window_at_position (device, NULL, NULL);
context_wayland = g_object_new (GDK_TYPE_WAYLAND_DRAG_CONTEXT, NULL);
context = GDK_DRAG_CONTEXT (context_wayland);
context->source_window = g_object_ref (window);
context->is_source = TRUE;
context->targets = g_list_copy (targets);
gdk_drag_context_set_device (context, device);
display_wayland = GDK_WAYLAND_DISPLAY (gdk_device_get_display (device));
context_wayland->dnd_window = create_dnd_window ();
context_wayland->dnd_surface = gdk_wayland_window_get_wl_surface (context_wayland->dnd_window);
context_wayland->data_source =
gdk_wayland_selection_get_data_source (window,
gdk_wayland_drag_context_get_selection (context));
for (l = context->targets; l; l = l->next)
wl_data_source_offer (context_wayland->data_source, gdk_atom_name (l->data));
wl_data_device_start_drag (gdk_wayland_device_get_data_device (device),
context_wayland->data_source,
gdk_wayland_window_get_wl_surface (toplevel),
context_wayland->dnd_surface,
_gdk_wayland_display_get_serial (display_wayland));
return context;
}
@ -359,3 +413,92 @@ _gdk_wayland_drag_context_set_dest_window (GdkDragContext *context,
GDK_WAYLAND_DRAG_CONTEXT (context)->serial = serial;
gdk_wayland_drop_context_update_targets (context);
}
GdkDragContext *
gdk_wayland_drag_context_lookup_by_data_source (struct wl_data_source *source)
{
GList *l;
for (l = contexts; l; l = l->next)
{
GdkWaylandDragContext *wayland_context = l->data;
if (wayland_context->data_source == source)
return l->data;
}
return NULL;
}
GdkDragContext *
gdk_wayland_drag_context_lookup_by_source_window (GdkWindow *window)
{
GList *l;
for (l = contexts; l; l = l->next)
{
if (window == gdk_drag_context_get_source_window (l->data))
return l->data;
}
return NULL;
}
struct wl_data_source *
gdk_wayland_drag_context_get_data_source (GdkDragContext *context)
{
return GDK_WAYLAND_DRAG_CONTEXT (context)->data_source;
}
void
gdk_wayland_drag_context_undo_grab (GdkDragContext *context)
{
GdkEventSequence *sequence;
GdkModifierType state;
GdkDevice *device;
GdkEvent *event;
guint button;
gdouble x, y;
device = gdk_drag_context_get_device (context);
_gdk_wayland_device_get_last_implicit_grab_serial (GDK_WAYLAND_DEVICE (device), &sequence);
gdk_window_get_device_position_double (gdk_drag_context_get_source_window (context),
device, &x, &y, &state);
if (sequence)
{
event = gdk_event_new (GDK_TOUCH_END);
event->touch.window = g_object_ref (gdk_drag_context_get_source_window (context));
event->touch.send_event = TRUE;
event->touch.sequence = sequence;
event->touch.time = GDK_CURRENT_TIME;
event->touch.x = event->touch.x_root = x;
event->touch.y = event->touch.y_root = y;
}
else if (state & (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK))
{
if (state & GDK_BUTTON1_MASK)
button = 1;
else if (state & GDK_BUTTON2_MASK)
button = 2;
else if (state & GDK_BUTTON3_MASK)
button = 3;
else
return;
event = gdk_event_new (GDK_BUTTON_RELEASE);
event->button.window = g_object_ref (gdk_drag_context_get_source_window (context));
event->button.send_event = TRUE;
event->button.button = button;
event->button.time = GDK_CURRENT_TIME;
event->button.x = event->button.x_root = x;
event->button.y = event->button.x_root = y;
}
else
return;
gdk_event_set_device (event, device);
gdk_event_set_source_device (event, device);
_gdk_wayland_display_deliver_event (gdk_device_get_display (device), event);
}