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gtkgesture: Accumulate touchpad events' dx/dy in point data

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This will make the gesture "center" the pointer position, plus
the accumulated dx/dy throughout the gesture progress.
This commit is contained in:
Carlos Garnacho 2015-07-24 11:48:44 +02:00
parent 4457be688d
commit e736e8dcb9
1 changed files with 56 additions and 1 deletions
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57
gtk/gtkgesture.c
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@ -138,6 +138,11 @@ struct _PointData
GdkEvent *event;
gdouble widget_x;
gdouble widget_y;
/* Acummulators for touchpad events */
gdouble accum_dx;
gdouble accum_dy;
guint press_handled : 1;
guint state : 2;
};
@ -400,6 +405,55 @@ _find_widget_window (GtkGesture *gesture,
return NULL;
}
static void
_update_touchpad_deltas (PointData *data)
{
GdkEvent *event = data->event;
if (!event)
return;
if (event->type == GDK_TOUCHPAD_SWIPE)
{
if (event->touchpad_swipe.phase == GDK_TOUCHPAD_GESTURE_PHASE_BEGIN)
data->accum_dx = data->accum_dy = 0;
else if (event->touchpad_swipe.phase == GDK_TOUCHPAD_GESTURE_PHASE_UPDATE)
{
data->accum_dx += event->touchpad_swipe.dx;
data->accum_dy += event->touchpad_swipe.dy;
}
}
else if (event->type == GDK_TOUCHPAD_PINCH)
{
if (event->touchpad_pinch.phase == GDK_TOUCHPAD_GESTURE_PHASE_BEGIN)
data->accum_dx = data->accum_dy = 0;
else if (event->touchpad_pinch.phase == GDK_TOUCHPAD_GESTURE_PHASE_UPDATE)
{
data->accum_dx += event->touchpad_pinch.dx;
data->accum_dy += event->touchpad_pinch.dy;
}
}
}
static void
_get_event_coordinates (PointData *data,
gdouble *x,
gdouble *y)
{
gdouble event_x, event_y;
g_assert (data->event != NULL);
gdk_event_get_coords (data->event, &event_x, &event_y);
event_x += data->accum_dx;
event_y += data->accum_dy;
if (x)
*x = event_x;
if (y)
*y = event_y;
}
static void
_update_widget_coordinates (GtkGesture *gesture,
PointData *data)
@ -413,7 +467,7 @@ _update_widget_coordinates (GtkGesture *gesture,
event_widget = gtk_get_event_widget (data->event);
widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
event_widget_window = gtk_widget_get_window (event_widget);
gdk_event_get_coords (data->event, &event_x, &event_y);
_get_event_coordinates (data, &event_x, &event_y);
window = data->event->any.window;
while (window && window != event_widget_window)
@ -540,6 +594,7 @@ _gtk_gesture_update_point (GtkGesture *gesture,
gdk_event_free (data->event);
data->event = gdk_event_copy (event);
_update_touchpad_deltas (data);
_update_widget_coordinates (gesture, data);
/* Deny the sequence right away if the expected