appDisplay: Animate appIcon for new window of apps

Following design mockups, animate the icons on AllView, FrequentView,
Dash and Search to zoom out when opening a new window of the app or when
the app is not running and the user execute it.

https://bugzilla.gnome.org/show_bug.cgi?id=734726

js/ui/appDisplay.js

@@ -1699,6 +1699,9 @@ const AppIcon = new Lang.Class({
                             this.app.state == Shell.AppState.RUNNING ||
                             button && button == 2;
 
+        if (this.app.state == Shell.AppState.STOPPED || openNewWindow)
+            this.animateLaunch();
+
         if (openNewWindow)
             this.app.open_new_window(-1);
         else
@@ -1707,6 +1710,10 @@ const AppIcon = new Lang.Class({
         Main.overview.hide();
     },
 
+    animateLaunch: function() {
+        this.icon.animateZoomOut();
+    },
+
     shellWorkspaceLaunch : function(params) {
         params = Params.parse(params, { workspace: -1,
                                         timestamp: 0 });
@@ -1788,6 +1795,9 @@ const AppIconMenu = new Lang.Class({
             if (this._source.app.can_open_new_window()) {
                 this._newWindowMenuItem = this._appendMenuItem(_("New Window"));
                 this._newWindowMenuItem.connect('activate', Lang.bind(this, function() {
+                    if (this._source.app.state == Shell.AppState.STOPPED)
+                        this._source.animateLaunch();
+
                     this._source.app.open_new_window(-1);
                     this.emit('activate-window', null);
                 }));

js/ui/iconGrid.js

@@ -30,6 +30,9 @@ const AnimationDirection = {
     OUT: 1
 };
 
+const APPICON_ANIMATION_OUT_SCALE = 3;
+const APPICON_ANIMATION_OUT_TIME = 0.25;
+
 const BaseIcon = new Lang.Class({
     Name: 'BaseIcon',
 
@@ -187,9 +190,55 @@ const BaseIcon = new Lang.Class({
 
     _onIconThemeChanged: function() {
         this._createIconTexture(this.iconSize);
+    },
+
+    animateZoomOut: function() {
+        // Animate only the child instead of the entire actor, so the
+        // styles like hover and running are not applied while
+        // animating.
+        zoomOutActor(this.actor.child);
     }
 });
 
+function clamp(value, min, max) {
+    return Math.max(Math.min(value, max), min);
+};
+
+function zoomOutActor(actor) {
+    let actorClone = new Clutter.Clone({ source: actor,
+                                         reactive: false });
+    let [width, height] = actor.get_transformed_size();
+    let [x, y] = actor.get_transformed_position();
+    actorClone.set_size(width, height);
+    actorClone.set_position(x, y);
+    actorClone.opacity = 255;
+    actorClone.set_pivot_point(0.5, 0.5);
+
+    Main.uiGroup.add_actor(actorClone);
+
+    // Avoid monitor edges to not zoom outside the current monitor
+    let monitor = Main.layoutManager.findMonitorForActor(actor);
+    let scaledWidth = width * APPICON_ANIMATION_OUT_SCALE;
+    let scaledHeight = height * APPICON_ANIMATION_OUT_SCALE;
+    let scaledX = x - (scaledWidth - width) / 2;
+    let scaledY = y - (scaledHeight - height) / 2;
+    let containedX = clamp(scaledX, monitor.x, monitor.x + monitor.width - scaledWidth);
+    let containedY = clamp(scaledY, monitor.y, monitor.y + monitor.height - scaledHeight);
+
+    Tweener.addTween(actorClone,
+                     { time: APPICON_ANIMATION_OUT_TIME,
+                       scale_x: APPICON_ANIMATION_OUT_SCALE,
+                       scale_y: APPICON_ANIMATION_OUT_SCALE,
+                       translation_x: containedX - scaledX,
+                       translation_y: containedY - scaledY,
+                       opacity: 0,
+                       transition: 'easeOutQuad',
+                       onComplete: function() {
+                           actorClone.destroy();
+                       }
+                    });
+}
+
 const IconGrid = new Lang.Class({
     Name: 'IconGrid',
 

js/ui/search.js

@@ -6,6 +6,7 @@ const Gio = imports.gi.Gio;
 const Gtk = imports.gi.Gtk;
 const Meta = imports.gi.Meta;
 const Signals = imports.signals;
+const Shell = imports.gi.Shell;
 const St = imports.gi.St;
 const Atk = imports.gi.Atk;
 
@@ -397,6 +398,7 @@ const ListSearchResults = new Lang.Class({
         this.providerIcon.connect('key-focus-in', Lang.bind(this, this._keyFocusIn));
         this.providerIcon.connect('clicked', Lang.bind(this,
             function() {
+                this.providerIcon.animateLaunch();
                 provider.launchSearch(this._terms);
                 Main.overview.toggle();
             }));
@@ -708,5 +710,12 @@ const ProviderIcon = new Lang.Class({
                                  gicon: provider.appInfo.get_icon() });
         this._content.add_actor(icon);
         this._content.add_actor(this.moreIcon);
+    },
+
+    animateLaunch: function() {
+        let appSys = Shell.AppSystem.get_default();
+        let app = appSys.lookup_app(this.provider.appInfo.get_id());
+        if (app.state == Shell.AppState.STOPPED)
+            IconGrid.zoomOutActor(this._content);
     }
 });