MultitaskingView: Add overshoot animation

Author: lenemter

lib/Gestures/PropertyTarget.vala

@@ -10,11 +10,24 @@ public class Gala.PropertyTarget : Object, GestureTarget {
     // Don't take a reference since we are most of the time owned by the target
     public weak Object? target { get; private set; }
     public string property { get; construct; }
-
+    public bool allow_overshoot { get; construct; }
     public Clutter.Interval interval { get; construct; }
 
-    public PropertyTarget (GestureAction action, Object target, string property, Type value_type, Value from_value, Value to_value) {
-        Object (action: action, property: property, interval: new Clutter.Interval.with_values (value_type, from_value, to_value));
+    public PropertyTarget (
+        GestureAction action,
+        Object target,
+        string property,
+        Type value_type,
+        Value from_value,
+        Value to_value,
+        bool allow_overshoot = false
+    ) {
+        Object (
+            action: action,
+            property: property,
+            interval: new Clutter.Interval.with_values (value_type, from_value, to_value),
+            allow_overshoot: allow_overshoot
+        );
 
         this.target = target;
         this.target.weak_ref (on_target_disposed);
@@ -35,6 +48,10 @@ public class Gala.PropertyTarget : Object, GestureTarget {
             return;
         }
 
+        if (!allow_overshoot) {
+            progress = progress.clamp (0.0, 1.0);
+        }
+
         target.set_property (property, interval.compute (progress));
     }
 }

src/Widgets/MultitaskingView/MultitaskingView.vala

@@ -61,7 +61,10 @@ public class Gala.MultitaskingView : ActorTarget, RootTarget, ActivatableCompone
         opened = false;
         display = wm.get_display ();
 
-        multitasking_gesture_controller = new GestureController (MULTITASKING_VIEW, wm, MULTITASKING_VIEW);
+        multitasking_gesture_controller = new GestureController (MULTITASKING_VIEW, wm, MULTITASKING_VIEW) {
+            overshoot_upper_clamp = 1.1,
+            overshoot_lower_clamp = -0.1
+        };
         multitasking_gesture_controller.enable_touchpad (wm.stage);
         add_gesture_controller (multitasking_gesture_controller);
 

src/Widgets/MultitaskingView/WorkspaceClone.vala

@@ -239,9 +239,9 @@ public class Gala.WorkspaceClone : ActorTarget {
         var initial_width = monitor.width;
         var target_width = monitor.width * scale + WorkspaceRow.WORKSPACE_GAP * 2;
 
-        add_target (new PropertyTarget (MULTITASKING_VIEW, this, "width", typeof (float), (float) initial_width, (float) target_width));
-        add_target (new PropertyTarget (MULTITASKING_VIEW, background, "scale-x", typeof (double), 1d, (double) scale));
-        add_target (new PropertyTarget (MULTITASKING_VIEW, background, "scale-y", typeof (double), 1d, (double) scale));
+        add_target (new PropertyTarget (MULTITASKING_VIEW, this, "width", typeof (float), (float) initial_width, (float) target_width, true));
+        add_target (new PropertyTarget (MULTITASKING_VIEW, background, "scale-x", typeof (double), 1d, (double) scale, true));
+        add_target (new PropertyTarget (MULTITASKING_VIEW, background, "scale-y", typeof (double), 1d, (double) scale, true));
 
         window_container.padding_top = Utils.scale_to_int (TOP_OFFSET, monitor_scale);
         window_container.padding_left = window_container.padding_right = (int) (monitor.width - monitor.width * scale) / 2;