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gtk: Scroll events dispatch support

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/567>
This commit is contained in:
Philippe Normand 2020-04-15 10:33:22 +01:00
parent d270fa498c
commit a9bb6d4572
1 changed files with 47 additions and 1 deletions
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48
ext/gtk/gtkgstbasewidget.c
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@ -361,6 +361,51 @@ gtk_gst_base_widget_motion_event (GtkWidget * widget, GdkEventMotion * event)
return FALSE; return FALSE;
} }
static gboolean
gtk_gst_base_widget_scroll_event (GtkWidget * widget, GdkEventScroll * event)
{
GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (widget);
GstElement *element;
if ((element = g_weak_ref_get (&base_widget->element))) {
if (GST_IS_NAVIGATION (element)) {
gdouble x, y, delta_x, delta_y;
gtk_gst_base_widget_display_size_to_stream_size (base_widget, event->x,
event->y, &x, &y);
if (!gdk_event_get_scroll_deltas ((GdkEvent *) event, &delta_x, &delta_y)) {
gdouble offset = 20;
delta_x = event->delta_x;
delta_y = event->delta_y;
switch (event->direction) {
case GDK_SCROLL_UP:
delta_y = offset;
break;
case GDK_SCROLL_DOWN:
delta_y = -offset;
break;
case GDK_SCROLL_LEFT:
delta_x = -offset;
break;
case GDK_SCROLL_RIGHT:
delta_x = offset;
break;
default:
break;
}
}
gst_navigation_send_mouse_scroll_event (GST_NAVIGATION (element),
x, y, delta_x, delta_y);
}
g_object_unref (element);
}
return FALSE;
}
void void
gtk_gst_base_widget_class_init (GtkGstBaseWidgetClass * klass) gtk_gst_base_widget_class_init (GtkGstBaseWidgetClass * klass)
{ {
@ -394,6 +439,7 @@ gtk_gst_base_widget_class_init (GtkGstBaseWidgetClass * klass)
widget_klass->button_press_event = gtk_gst_base_widget_button_event; widget_klass->button_press_event = gtk_gst_base_widget_button_event;
widget_klass->button_release_event = gtk_gst_base_widget_button_event; widget_klass->button_release_event = gtk_gst_base_widget_button_event;
widget_klass->motion_notify_event = gtk_gst_base_widget_motion_event; widget_klass->motion_notify_event = gtk_gst_base_widget_motion_event;
widget_klass->scroll_event = gtk_gst_base_widget_scroll_event;
GST_DEBUG_CATEGORY_INIT (gst_debug_gtk_base_widget, "gtkbasewidget", 0, GST_DEBUG_CATEGORY_INIT (gst_debug_gtk_base_widget, "gtkbasewidget", 0,
"Gtk Video Base Widget"); "Gtk Video Base Widget");
@ -421,7 +467,7 @@ gtk_gst_base_widget_init (GtkGstBaseWidget * widget)
| GDK_KEY_RELEASE_MASK | GDK_KEY_RELEASE_MASK
| GDK_BUTTON_PRESS_MASK | GDK_BUTTON_PRESS_MASK
| GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK
| GDK_POINTER_MOTION_MASK | GDK_BUTTON_MOTION_MASK; | GDK_POINTER_MOTION_MASK | GDK_BUTTON_MOTION_MASK | GDK_SCROLL_MASK;
gtk_widget_set_events (GTK_WIDGET (widget), event_mask); gtk_widget_set_events (GTK_WIDGET (widget), event_mask);
} }