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widget: Parent widgets may also consume motions

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This is important when the target widget of an event is not the one that
would otherwise receive the gesture. For example, the GtkSwitch
implementation currently attaches a pan gesture to the switch itself,
but the target widget below the pointer might be the switch slider or
label.

See #1465
This commit is contained in:
Timm Bäder 2018-11-21 17:51:10 +01:00
parent eeeefb40c7
commit b7963a06ab
1 changed files with 18 additions and 13 deletions
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31
gtk/gtkwidget.c
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@ -12925,23 +12925,28 @@ _gtk_widget_consumes_motion (GtkWidget *widget,
GdkEventSequence *sequence)
{
GtkWidgetPrivate *priv = gtk_widget_get_instance_private (widget);
GList *l;
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
for (l = priv->event_controllers; l; l = l->next)
while (widget != NULL && !GTK_IS_WINDOW (widget))
{
GtkEventController *controller = l->data;
GList *l;
if (controller == NULL ||
!GTK_IS_GESTURE (controller))
continue;
for (l = priv->event_controllers; l; l = l->next)
{
GtkEventController *controller = l->data;
if ((!GTK_IS_GESTURE_SINGLE (controller) ||
GTK_IS_GESTURE_DRAG (controller) ||
GTK_IS_GESTURE_SWIPE (controller)) &&
gtk_gesture_handles_sequence (GTK_GESTURE (controller), sequence))
return TRUE;
if (controller == NULL ||
!GTK_IS_GESTURE (controller))
continue;
if ((!GTK_IS_GESTURE_SINGLE (controller) ||
GTK_IS_GESTURE_DRAG (controller) ||
GTK_IS_GESTURE_SWIPE (controller)) &&
gtk_gesture_handles_sequence (GTK_GESTURE (controller), sequence))
return TRUE;
}
widget = priv->parent;
priv = gtk_widget_get_instance_private (widget);
}
return FALSE;