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dnd: Use GtkGestureDrag to initiate DnD

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This gesture is used by gtk_drag_source_set() to determine
whether dragging moved past the threshold. The gesture events
are handled via the usual ::event callbacks, so we don't mess
up with callers expecting that to happen in a signal handler.

If the sequence gets claimed somewhere else in the event widget
stack, the DnD gesture will be cancelled.
This commit is contained in:
Carlos Garnacho 2014-03-28 23:23:38 +01:00
parent 6c78716531
commit b0eef458d1
1 changed files with 43 additions and 57 deletions
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100
gtk/gtkdnd.c
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@ -90,6 +90,7 @@ struct _GtkDragSourceSite
GdkDragAction actions; /* Possible actions */
GtkIconHelper *icon_helper;
GtkGesture *drag_gesture;
/* Stored button press information to detect drag beginning */
gint state;
@ -180,7 +181,7 @@ enum {
};
/* Forward declarations */
static void gtk_drag_get_event_actions (GdkEvent *event,
static void gtk_drag_get_event_actions (const GdkEvent *event,
gint button,
GdkDragAction actions,
GdkDragAction *suggested_action,
@ -265,7 +266,7 @@ static void gtk_drag_update (GtkDragSourceInfo *info,
GdkScreen *screen,
gint x_root,
gint y_root,
GdkEvent *event);
const GdkEvent *event);
static gboolean gtk_drag_motion_cb (GtkWidget *widget,
GdkEventMotion *event,
gpointer data);
@ -696,8 +697,8 @@ gtk_drag_get_event_time (GdkEvent *event)
}
static void
gtk_drag_get_event_actions (GdkEvent *event,
gint button,
gtk_drag_get_event_actions (const GdkEvent *event,
gint button,
GdkDragAction actions,
GdkDragAction *suggested_action,
GdkDragAction *possible_actions)
@ -2472,7 +2473,7 @@ gtk_drag_begin_internal (GtkWidget *widget,
GtkTargetList *target_list,
GdkDragAction actions,
gint button,
GdkEvent *event,
const GdkEvent *event,
int x,
int y)
{
@ -2797,7 +2798,11 @@ gtk_drag_source_set (GtkWidget *widget,
{
site = g_slice_new0 (GtkDragSourceSite);
site->icon_helper = _gtk_icon_helper_new ();
site->drag_gesture = gtk_gesture_drag_new (widget);
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (site->drag_gesture),
FALSE);
gtk_widget_add_gesture (widget, site->drag_gesture, GTK_PHASE_NONE);
g_signal_connect (widget, "button-press-event",
G_CALLBACK (gtk_drag_source_event_cb),
site);
@ -2807,7 +2812,6 @@ gtk_drag_source_set (GtkWidget *widget,
g_signal_connect (widget, "motion-notify-event",
G_CALLBACK (gtk_drag_source_event_cb),
site);
g_object_set_data_full (G_OBJECT (widget),
I_("gtk-site-data"),
site, gtk_drag_source_site_destroy);
@ -2838,8 +2842,9 @@ gtk_drag_source_unset (GtkWidget *widget)
if (site)
{
g_signal_handlers_disconnect_by_func (widget,
gtk_drag_source_event_cb,
site);
gtk_drag_source_event_cb,
site);
gtk_widget_remove_gesture (widget, site->drag_gesture);
g_object_set_data (G_OBJECT (widget), I_("gtk-site-data"), NULL);
}
}
@ -3899,58 +3904,38 @@ gtk_drag_source_event_cb (GtkWidget *widget,
GdkEvent *event,
gpointer data)
{
GtkDragSourceSite *site;
gboolean retval = FALSE;
site = (GtkDragSourceSite *)data;
gdouble start_x, start_y, offset_x, offset_y;
GtkDragSourceSite *site = data;
switch (event->type)
gtk_event_controller_handle_event (GTK_EVENT_CONTROLLER (site->drag_gesture), event);
if (gtk_gesture_is_recognized (site->drag_gesture))
{
case GDK_BUTTON_PRESS:
if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask)
{
site->state |= (GDK_BUTTON1_MASK << (event->button.button - 1));
site->x = event->button.x;
site->y = event->button.y;
}
break;
case GDK_BUTTON_RELEASE:
if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask)
site->state &= ~(GDK_BUTTON1_MASK << (event->button.button - 1));
break;
case GDK_MOTION_NOTIFY:
if (site->state & event->motion.state & site->start_button_mask)
{
/* FIXME: This is really broken and can leave us
* with a stuck grab
*/
int i;
for (i=1; i<6; i++)
{
if (site->state & event->motion.state &
GDK_BUTTON1_MASK << (i - 1))
break;
}
gtk_gesture_drag_get_start_point (GTK_GESTURE_DRAG (site->drag_gesture),
&start_x, &start_y);
gtk_gesture_drag_get_offset (GTK_GESTURE_DRAG (site->drag_gesture),
&offset_x, &offset_y);
if (gtk_drag_check_threshold (widget, site->x, site->y,
event->motion.x, event->motion.y))
{
site->state = 0;
gtk_drag_begin_internal (widget, site, site->target_list,
site->actions, i, event,
site->x, site->y);
if (gtk_drag_check_threshold (widget, start_x, start_y,
start_x + offset_x, start_y + offset_y))
{
GdkEventSequence *sequence;
const GdkEvent *event;
guint button;
retval = TRUE;
}
}
break;
default: /* hit for 2/3BUTTON_PRESS */
break;
sequence = gtk_gesture_get_last_updated_sequence (site->drag_gesture);
event = gtk_gesture_get_last_event (GTK_GESTURE (site->drag_gesture), sequence);
button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (site->drag_gesture));
gtk_event_controller_reset (GTK_EVENT_CONTROLLER (site->drag_gesture));
gtk_drag_begin_internal (widget, site, site->target_list,
site->actions, button, event,
start_x, start_y);
return TRUE;
}
}
return retval;
return FALSE;
}
static void
@ -3962,6 +3947,7 @@ gtk_drag_source_site_destroy (gpointer data)
gtk_target_list_unref (site->target_list);
g_clear_object (&site->icon_helper);
g_clear_object (&site->drag_gesture);
g_slice_free (GtkDragSourceSite, site);
}
@ -4223,7 +4209,7 @@ gtk_drag_update (GtkDragSourceInfo *info,
GdkScreen *screen,
gint x_root,
gint y_root,
GdkEvent *event)
const GdkEvent *event)
{
info->cur_screen = screen;
info->cur_x = x_root;