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Fix #1029: Zoom using multi-touch gestures

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JoseExposito 2021-04-02 12:20:17 +02:00 committed by Daniel Foré
parent 1e42575351
commit afa0b81699
1 changed files with 34 additions and 0 deletions
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34
src/Zoom.vala
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@ -29,6 +29,8 @@ namespace Gala {
float current_zoom = MIN_ZOOM;
ulong wins_handler_id = 0UL;
private GestureTracker gesture_tracker;
public Zoom (WindowManager wm) {
Object (wm: wm);
@ -37,6 +39,10 @@ namespace Gala {
display.add_keybinding ("zoom-in", schema, 0, (Meta.KeyHandlerFunc) zoom_in);
display.add_keybinding ("zoom-out", schema, 0, (Meta.KeyHandlerFunc) zoom_out);
gesture_tracker = new GestureTracker (AnimationDuration.WORKSPACE_SWITCH_MIN, AnimationDuration.WORKSPACE_SWITCH);
gesture_tracker.enable_touchpad ();
gesture_tracker.on_gesture_detected.connect (on_gesture_detected);
}
~Zoom () {
@ -64,6 +70,34 @@ namespace Gala {
zoom (-SHORTCUT_DELTA, true, true);
}
private void on_gesture_detected (Gesture gesture) {
var enabled = gesture_tracker.settings.is_gesture_enabled (GestureSettings.ZOOM_ENABLED);
var fingers = gesture_tracker.settings.gesture_fingers (GestureSettings.ZOOM_FINGERS);
bool can_handle_gesture = gesture.type == Gdk.EventType.TOUCHPAD_PINCH
&& (gesture.direction == GestureDirection.IN || gesture.direction == GestureDirection.OUT)
&& gesture.fingers == fingers;
if (enabled && can_handle_gesture) {
zoom_with_gesture (gesture.direction);
}
}
private void zoom_with_gesture (GestureDirection direction) {
var initial_zoom = current_zoom;
var target_zoom = (direction == GestureDirection.IN)
? initial_zoom - MAX_ZOOM
: initial_zoom + MAX_ZOOM;
GestureTracker.OnUpdate on_animation_update = (percentage) => {
var zoom_level = GestureTracker.animation_value (initial_zoom, target_zoom, percentage);
var delta = zoom_level - current_zoom;
zoom (delta, false, false);
};
gesture_tracker.connect_handlers (null, (owned) on_animation_update, null);
}
void zoom (float delta, bool play_sound, bool animate) {
// Nothing to do if zooming out of our bounds is requested
if ((current_zoom <= MIN_ZOOM && delta < 0) || (current_zoom >= MAX_ZOOM && delta >= 0)) {