[gnome-shell/wip/exalm/gestures: 11/17] workspaceAnimation: Split from WindowManager



commit 79447244104503aca68988791871f5c41e84c8dd
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Tue Jul 2 22:28:47 2019 +0500

    workspaceAnimation: Split from WindowManager
    
    It's already too complex, and will get more complex in future, split it
    out.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/605

 js/js-resources.gresource.xml |   1 +
 js/ui/windowManager.js        | 380 +--------------------------------------
 js/ui/workspaceAnimation.js   | 407 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 414 insertions(+), 374 deletions(-)
---
diff --git a/js/js-resources.gresource.xml b/js/js-resources.gresource.xml
index aec3427e0..938e2c489 100644
--- a/js/js-resources.gresource.xml
+++ b/js/js-resources.gresource.xml
@@ -109,6 +109,7 @@
     <file>ui/windowMenu.js</file>
     <file>ui/windowManager.js</file>
     <file>ui/workspace.js</file>
+    <file>ui/workspaceAnimation.js</file>
     <file>ui/workspaceSwitcherPopup.js</file>
     <file>ui/workspaceThumbnail.js</file>
     <file>ui/workspacesView.js</file>
diff --git a/js/ui/windowManager.js b/js/ui/windowManager.js
index 446653ddf..c46327b63 100644
--- a/js/ui/windowManager.js
+++ b/js/ui/windowManager.js
@@ -17,8 +17,8 @@ const WindowMenu = imports.ui.windowMenu;
 const PadOsd = imports.ui.padOsd;
 const EdgeDragAction = imports.ui.edgeDragAction;
 const CloseDialog = imports.ui.closeDialog;
-const SwipeTracker = imports.ui.swipeTracker;
 const SwitchMonitor = imports.ui.switchMonitor;
+const WorkspaceAnimation = imports.ui.workspaceAnimation;
 
 const { loadInterfaceXML } = imports.misc.fileUtils;
 
@@ -563,7 +563,6 @@ var WindowManager = class {
         this._mapping = [];
         this._resizing = [];
         this._destroying = [];
-        this._movingWindow = null;
 
         this._dimmedWindows = [];
 
@@ -573,15 +572,6 @@ var WindowManager = class {
 
         this._isWorkspacePrepended = false;
 
-        this._switchData = null;
-        this._shellwm.connect('kill-switch-workspace', (shellwm) => {
-            if (this._switchData) {
-                if (this._switchData.inProgress)
-                    this._switchWorkspaceDone(shellwm);
-                else if (!this._switchData.gestureActivated)
-                    this._finishWorkspaceSwitch(this._switchData);
-            }
-        });
         this._shellwm.connect('kill-window-effects', (shellwm, actor) => {
             this._minimizeWindowDone(shellwm, actor);
             this._mapWindowDone(shellwm, actor);
@@ -603,7 +593,6 @@ var WindowManager = class {
         this._shellwm.connect('confirm-display-change', this._confirmDisplayChange.bind(this));
         this._shellwm.connect('create-close-dialog', this._createCloseDialog.bind(this));
         this._shellwm.connect('create-inhibit-shortcuts-dialog', 
this._createInhibitShortcutsDialog.bind(this));
-        global.display.connect('restacked', this._syncStacking.bind(this));
 
         this._workspaceSwitcherPopup = null;
         this._tilePreview = null;
@@ -911,17 +900,10 @@ var WindowManager = class {
         Main.overview.connect('showing', () => {
             for (let i = 0; i < this._dimmedWindows.length; i++)
                 this._undimWindow(this._dimmedWindows[i]);
-
-            if (this._switchData) {
-                if (this._switchData.gestureActivated)
-                    this._switchWorkspaceStop();
-                this._swipeTracker.enabled = false;
-            }
         });
         Main.overview.connect('hiding', () => {
             for (let i = 0; i < this._dimmedWindows.length; i++)
                 this._dimWindow(this._dimmedWindows[i]);
-            this._swipeTracker.enabled = true;
         });
 
         this._windowMenuManager = new WindowMenu.WindowMenuManager();
@@ -932,13 +914,6 @@ var WindowManager = class {
         global.workspace_manager.override_workspace_layout(Meta.DisplayCorner.TOPLEFT,
                                                            false, -1, 1);
 
-        let allowedModes = Shell.ActionMode.NORMAL;
-        let swipeTracker = new SwipeTracker.SwipeTracker(global.stage, allowedModes, false, false);
-        swipeTracker.connect('begin', this._switchWorkspaceBegin.bind(this));
-        swipeTracker.connect('update', this._switchWorkspaceUpdate.bind(this));
-        swipeTracker.connect('end', this._switchWorkspaceEnd.bind(this));
-        this._swipeTracker = swipeTracker;
-
         let appSwitchAction = new AppSwitchAction();
         global.stage.add_action(appSwitchAction);
 
@@ -969,6 +944,8 @@ var WindowManager = class {
         global.display.connect('in-fullscreen-changed', updateUnfullscreenGesture);
 
         global.stage.add_action(topDragAction);
+
+        this._workspaceAnimation = new WorkspaceAnimation.WorkspaceAnimationController();
     }
 
     _showPadOsd(display, device, settings, imagePath, editionMode, monitorIndex) {
@@ -1022,7 +999,7 @@ var WindowManager = class {
     }
 
     _shouldAnimate() {
-        return !(Main.overview.visible || (this._switchData && this._switchData.gestureActivated));
+        return !(Main.overview.visible || this._workspaceAnimation.isAnimating());
     }
 
     _shouldAnimateActor(actor, types) {
@@ -1590,358 +1567,13 @@ var WindowManager = class {
         return !(this._allowedKeybindings[binding.get_name()] & Main.actionMode);
     }
 
-    _syncStacking() {
-        if (this._switchData == null)
-            return;
-
-        let windows = global.get_window_actors();
-        let lastCurSibling = null;
-        let lastDirSibling = [];
-        for (let i = 0; i < windows.length; i++) {
-            if (windows[i].get_parent() == this._switchData.curGroup) {
-                this._switchData.curGroup.set_child_above_sibling(windows[i], lastCurSibling);
-                lastCurSibling = windows[i];
-            } else {
-                for (let dir of Object.values(Meta.MotionDirection)) {
-                    let info = this._switchData.surroundings[dir];
-                    if (!info || windows[i].get_parent() != info.actor)
-                        continue;
-
-                    let sibling = lastDirSibling[dir];
-                    if (sibling == undefined)
-                        sibling = null;
-
-                    info.actor.set_child_above_sibling(windows[i], sibling);
-                    lastDirSibling[dir] = windows[i];
-                    break;
-                }
-            }
-        }
-    }
-
-    _getPositionForDirection(direction, fromWs, toWs) {
-        let xDest = 0, yDest = 0;
-
-        let oldWsIsFullscreen = fromWs.list_windows().some(w => w.is_fullscreen());
-        let newWsIsFullscreen = toWs.list_windows().some(w => w.is_fullscreen());
-
-        // We have to shift windows up or down by the height of the panel to prevent having a
-        // visible gap between the windows while switching workspaces. Since fullscreen windows
-        // hide the panel, they don't need to be shifted up or down.
-        let shiftHeight = Main.panel.height;
-
-        if (direction == Meta.MotionDirection.UP ||
-            direction == Meta.MotionDirection.UP_LEFT ||
-            direction == Meta.MotionDirection.UP_RIGHT)
-            yDest = -global.screen_height + (oldWsIsFullscreen ? 0 : shiftHeight);
-        else if (direction == Meta.MotionDirection.DOWN ||
-            direction == Meta.MotionDirection.DOWN_LEFT ||
-            direction == Meta.MotionDirection.DOWN_RIGHT)
-            yDest = global.screen_height - (newWsIsFullscreen ? 0 : shiftHeight);
-
-        if (direction == Meta.MotionDirection.LEFT ||
-            direction == Meta.MotionDirection.UP_LEFT ||
-            direction == Meta.MotionDirection.DOWN_LEFT)
-            xDest = -global.screen_width;
-        else if (direction == Meta.MotionDirection.RIGHT ||
-                 direction == Meta.MotionDirection.UP_RIGHT ||
-                 direction == Meta.MotionDirection.DOWN_RIGHT)
-            xDest = global.screen_width;
-
-        return [xDest, yDest];
-    }
-
-    _prepareWorkspaceSwitch(from, to, direction) {
-        if (this._switchData)
-            return;
-
-        let wgroup = global.window_group;
-        let windows = global.get_window_actors();
-        let switchData = {};
-
-        this._switchData = switchData;
-        switchData.curGroup = new Clutter.Actor();
-        switchData.movingWindowBin = new Clutter.Actor();
-        switchData.windows = [];
-        switchData.surroundings = {};
-        switchData.gestureActivated = false;
-        switchData.inProgress = false;
-        switchData.progress = 0;
-
-        switchData.container = new Clutter.Actor();
-        switchData.container.add_actor(switchData.curGroup);
-
-        wgroup.add_actor(switchData.movingWindowBin);
-        wgroup.add_actor(switchData.container);
-
-        let workspaceManager = global.workspace_manager;
-        let curWs = workspaceManager.get_workspace_by_index (from);
-
-        for (let dir of Object.values(Meta.MotionDirection)) {
-            let ws = null;
-
-            if (to < 0)
-                ws = curWs.get_neighbor(dir);
-            else if (dir == direction)
-                ws = workspaceManager.get_workspace_by_index(to);
-
-            if (ws == null || ws == curWs) {
-                switchData.surroundings[dir] = null;
-                continue;
-            }
-
-            let [x, y] = this._getPositionForDirection(dir, curWs, ws);
-            let info = { index: ws.index(),
-                         actor: new Clutter.Actor(),
-                         xDest: x,
-                         yDest: y };
-            switchData.surroundings[dir] = info;
-            switchData.container.add_actor(info.actor);
-            info.actor.raise_top();
-
-            info.actor.set_position(x, y);
-        }
-
-        switchData.movingWindowBin.raise_top();
-
-        for (let i = 0; i < windows.length; i++) {
-            let actor = windows[i];
-            let window = actor.get_meta_window();
-
-            if (!window.showing_on_its_workspace())
-                continue;
-
-            if (window.is_on_all_workspaces())
-                continue;
-
-            let record = { window: actor,
-                           parent: actor.get_parent() };
-
-            if (this._movingWindow && window == this._movingWindow) {
-                switchData.movingWindow = record;
-                switchData.windows.push(switchData.movingWindow);
-                actor.reparent(switchData.movingWindowBin);
-            } else if (window.get_workspace().index() == from) {
-                switchData.windows.push(record);
-                actor.reparent(switchData.curGroup);
-            } else {
-                let visible = false;
-                for (let dir of Object.values(Meta.MotionDirection)) {
-                    let info = switchData.surroundings[dir];
-
-                    if (!info || info.index != window.get_workspace().index())
-                        continue;
-
-                    switchData.windows.push(record);
-                    actor.reparent(info.actor);
-                    visible = true;
-                    break;
-                }
-
-                actor.visible = visible;
-            }
-        }
-
-        for (let i = 0; i < switchData.windows.length; i++) {
-            let w = switchData.windows[i];
-
-            w.windowDestroyId = w.window.connect('destroy', () => {
-                switchData.windows.splice(switchData.windows.indexOf(w), 1);
-            });
-        }
-    }
-
-    _finishWorkspaceSwitch(switchData) {
-        this._switchData = null;
-
-        for (let i = 0; i < switchData.windows.length; i++) {
-            let w = switchData.windows[i];
-
-            w.window.disconnect(w.windowDestroyId);
-            w.window.reparent(w.parent);
-
-            if (w.window.get_meta_window().get_workspace() !=
-                global.workspace_manager.get_active_workspace())
-                w.window.hide();
-        }
-        Tweener.removeTweens(switchData);
-        Tweener.removeTweens(switchData.container);
-        switchData.container.destroy();
-        switchData.movingWindowBin.destroy();
-
-        this._movingWindow = null;
-    }
-
     _switchWorkspace(shellwm, from, to, direction) {
         if (!Main.sessionMode.hasWorkspaces || !this._shouldAnimate()) {
             shellwm.completed_switch_workspace();
             return;
         }
 
-        this._prepareWorkspaceSwitch(from, to, direction);
-        this._switchData.inProgress = true;
-
-        let workspaceManager = global.workspace_manager;
-        let fromWs = workspaceManager.get_workspace_by_index(from);
-        let toWs = workspaceManager.get_workspace_by_index(to);
-
-        let [xDest, yDest] = this._getPositionForDirection(direction, fromWs, toWs);
-
-        /* @direction is the direction that the "camera" moves, so the
-         * screen contents have to move one screen's worth in the
-         * opposite direction.
-         */
-        xDest = -xDest;
-        yDest = -yDest;
-
-        Tweener.addTween(this._switchData,
-                         { progress: direction == Meta.MotionDirection.DOWN ? 1 : -1,
-                           time: WINDOW_ANIMATION_TIME,
-                           transition: 'easeOutCubic'
-                         });
-        Tweener.addTween(this._switchData.container,
-                         { x: xDest,
-                           y: yDest,
-                           time: WINDOW_ANIMATION_TIME,
-                           transition: 'easeOutCubic',
-                           onComplete: this._switchWorkspaceDone,
-                           onCompleteScope: this,
-                           onCompleteParams: [shellwm]
-                         });
-    }
-
-    _switchWorkspaceDone(shellwm) {
-        this._finishWorkspaceSwitch(this._switchData);
-        shellwm.completed_switch_workspace();
-    }
-
-    _directionForProgress(progress) {
-        if (global.workspace_manager.layout_rows == -1)
-            return (progress > 0) ? Meta.MotionDirection.DOWN : Meta.MotionDirection.UP;
-        else if (Clutter.get_default_text_direction () == Clutter.TextDirection.RTL)
-            return (progress > 0) ? Meta.MotionDirection.LEFT : Meta.MotionDirection.RIGHT;
-        else
-            return (progress > 0) ? Meta.MotionDirection.RIGHT : Meta.MotionDirection.LEFT;
-    }
-
-    _switchWorkspaceBegin(tracker, monitor) {
-        if (Meta.prefs_get_workspaces_only_on_primary() && monitor != Main.layoutManager.primaryIndex)
-            return;
-
-        let horiz = (global.workspace_manager.layout_rows != -1);
-        tracker.orientation = horiz ? Clutter.Orientation.HORIZONTAL : Clutter.Orientation.VERTICAL;
-
-        let workspaceManager = global.workspace_manager;
-        let activeWorkspace = workspaceManager.get_active_workspace();
-
-        if (this._switchData && this._switchData.gestureActivated) {
-            Tweener.removeTweens(this._switchData);
-            Tweener.removeTweens(this._switchData.container);
-
-            tracker.continueSwipe(this._switchData.progress);
-            return;
-        }
-
-        this._prepareWorkspaceSwitch(activeWorkspace.index(), -1);
-
-        let baseDistance;
-        if (horiz)
-            baseDistance = global.screen_width;
-        else
-            baseDistance = global.screen_height - Main.panel.height;
-
-        let backExtent = 0;
-        let forwardExtent = 0;
-
-        let direction = this._directionForProgress(1);
-        let backInfo = this._switchData.surroundings[direction];
-        if (!horiz && (backInfo != null))
-            backExtent = backInfo.yDest - baseDistance;
-
-        direction = this._directionForProgress(-1);
-        let forwardInfo = this._switchData.surroundings[direction];
-        if (!horiz && (forwardInfo != null))
-            forwardExtent = -forwardInfo.yDest - baseDistance;
-
-        if (global.workspace_manager.layout_rows != -1 &&
-            Clutter.get_default_text_direction () == Clutter.TextDirection.RTL) {
-            backExtent = -backExtent;
-            forwardExtent = -forwardExtent;
-        }
-
-        tracker.confirmSwipe((backInfo != null), (forwardInfo != null), baseDistance, backExtent, 
forwardExtent);
-    }
-
-    _switchWorkspaceUpdate(_tracker, progress) {
-        if (!this._switchData)
-            return;
-
-        this._switchData.progress = progress;
-
-        let direction = this._directionForProgress(progress);
-        let info = this._switchData.surroundings[direction];
-        let distance = 0;
-        let xPos = 0;
-        let yPos = 0;
-        if (info) {
-            if (global.workspace_manager.layout_rows == -1)
-                yPos = Math.round(Math.abs(progress) * -info.yDest);
-            else
-                xPos = Math.round(Math.abs(progress) * -info.xDest);
-        }
-
-        this._switchData.container.set_position(xPos, yPos);
-    }
-
-    _switchWorkspaceEnd(_tracker, duration, endProgress) {
-        if (!this._switchData)
-            return;
-
-        let workspaceManager = global.workspace_manager;
-        let activeWorkspace = workspaceManager.get_active_workspace();
-        let newWs = activeWorkspace;
-        let xDest = 0;
-        let yDest = 0;
-        if (endProgress != 0) {
-            let direction = this._directionForProgress(endProgress);
-            newWs = activeWorkspace.get_neighbor(direction);
-            xDest = -this._switchData.surroundings[direction].xDest;
-            yDest = -this._switchData.surroundings[direction].yDest;
-        }
-
-        if (duration == 0) {
-            if (newWs != activeWorkspace)
-                this.actionMoveWorkspace(newWs);
-            this._switchWorkspaceStop();
-            return;
-        }
-
-        let switchData = this._switchData;
-        switchData.gestureActivated = true;
-
-        Tweener.addTween(switchData,
-                         { progress: endProgress,
-                           time: duration,
-                           transition: 'easeOutCubic'
-                         });
-        Tweener.addTween(switchData.container,
-                         { x: xDest,
-                           y: yDest,
-                           time: duration,
-                           transition: 'easeOutCubic',
-                           onComplete: () => {
-                               if (newWs != activeWorkspace)
-                                   this.actionMoveWorkspace(newWs);
-                               this._finishWorkspaceSwitch(switchData);
-                           }
-                         });
-    }
-
-    _switchWorkspaceStop() {
-        this._switchData.progress = 0;
-        this._switchData.container.x = 0;
-        this._switchData.container.y = 0;
-        this._finishWorkspaceSwitch(this._switchData);
+        this._workspaceAnimation.animateSwitchWorkspace(shellwm, from, to, direction);
     }
 
     _showTilePreview(shellwm, window, tileRect, monitorIndex) {
@@ -2150,7 +1782,7 @@ var WindowManager = class {
             // This won't have any effect for "always sticky" windows
             // (like desktop windows or docks)
 
-            this._movingWindow = window;
+            this._workspaceAnimation.movingWindow = window;
             window.change_workspace(workspace);
 
             global.display.clear_mouse_mode();
diff --git a/js/ui/workspaceAnimation.js b/js/ui/workspaceAnimation.js
new file mode 100644
index 000000000..e4eee217f
--- /dev/null
+++ b/js/ui/workspaceAnimation.js
@@ -0,0 +1,407 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+/* exported WorkspaceAnimationController */
+
+const { Clutter, Meta, Shell } = imports.gi;
+
+const Main = imports.ui.main;
+const Tweener = imports.ui.tweener;
+const SwipeTracker = imports.ui.swipeTracker;
+
+var WINDOW_ANIMATION_TIME = 0.25;
+
+var WorkspaceAnimationController = class {
+    constructor() {
+        this._shellwm = global.window_manager;
+        this._movingWindow = null;
+
+        this._switchData = null;
+        this._shellwm.connect('kill-switch-workspace', (shellwm) => {
+            if (this._switchData) {
+                if (this._switchData.inProgress)
+                    this._switchWorkspaceDone(shellwm);
+                else if (!this._switchData.gestureActivated)
+                    this._finishWorkspaceSwitch(this._switchData);
+            }
+        });
+
+        global.display.connect('restacked', this._syncStacking.bind(this));
+
+        Main.overview.connect('showing', () => {
+            if (this._switchData) {
+                if (this._switchData.gestureActivated)
+                    this._switchWorkspaceStop();
+                this._swipeTracker.enabled = false;
+            }
+        });
+        Main.overview.connect('hiding', () => {
+            this._swipeTracker.enabled = true;
+        });
+
+        let allowedModes = Shell.ActionMode.NORMAL;
+        let swipeTracker = new SwipeTracker.SwipeTracker(global.stage, allowedModes, false, false);
+        swipeTracker.connect('begin', this._switchWorkspaceBegin.bind(this));
+        swipeTracker.connect('update', this._switchWorkspaceUpdate.bind(this));
+        swipeTracker.connect('end', this._switchWorkspaceEnd.bind(this));
+        this._swipeTracker = swipeTracker;
+    }
+
+    _syncStacking() {
+        if (this._switchData == null)
+            return;
+
+        let windows = global.get_window_actors();
+        let lastCurSibling = null;
+        let lastDirSibling = [];
+        for (let i = 0; i < windows.length; i++) {
+            if (windows[i].get_parent() == this._switchData.curGroup) {
+                this._switchData.curGroup.set_child_above_sibling(windows[i], lastCurSibling);
+                lastCurSibling = windows[i];
+            } else {
+                for (let dir of Object.values(Meta.MotionDirection)) {
+                    let info = this._switchData.surroundings[dir];
+                    if (!info || windows[i].get_parent() != info.actor)
+                        continue;
+
+                    let sibling = lastDirSibling[dir];
+                    if (sibling == undefined)
+                        sibling = null;
+
+                    info.actor.set_child_above_sibling(windows[i], sibling);
+                    lastDirSibling[dir] = windows[i];
+                    break;
+                }
+            }
+        }
+    }
+
+    _getPositionForDirection(direction, fromWs, toWs) {
+        let xDest = 0, yDest = 0;
+
+        let oldWsIsFullscreen = fromWs.list_windows().some(w => w.is_fullscreen());
+        let newWsIsFullscreen = toWs.list_windows().some(w => w.is_fullscreen());
+
+        // We have to shift windows up or down by the height of the panel to prevent having a
+        // visible gap between the windows while switching workspaces. Since fullscreen windows
+        // hide the panel, they don't need to be shifted up or down.
+        let shiftHeight = Main.panel.height;
+
+        if (direction == Meta.MotionDirection.UP ||
+            direction == Meta.MotionDirection.UP_LEFT ||
+            direction == Meta.MotionDirection.UP_RIGHT)
+            yDest = -global.screen_height + (oldWsIsFullscreen ? 0 : shiftHeight);
+        else if (direction == Meta.MotionDirection.DOWN ||
+            direction == Meta.MotionDirection.DOWN_LEFT ||
+            direction == Meta.MotionDirection.DOWN_RIGHT)
+            yDest = global.screen_height - (newWsIsFullscreen ? 0 : shiftHeight);
+
+        if (direction == Meta.MotionDirection.LEFT ||
+            direction == Meta.MotionDirection.UP_LEFT ||
+            direction == Meta.MotionDirection.DOWN_LEFT)
+            xDest = -global.screen_width;
+        else if (direction == Meta.MotionDirection.RIGHT ||
+                 direction == Meta.MotionDirection.UP_RIGHT ||
+                 direction == Meta.MotionDirection.DOWN_RIGHT)
+            xDest = global.screen_width;
+
+        return [xDest, yDest];
+    }
+
+    _prepareWorkspaceSwitch(from, to, direction) {
+        if (this._switchData)
+            return;
+
+        let wgroup = global.window_group;
+        let windows = global.get_window_actors();
+        let switchData = {};
+
+        this._switchData = switchData;
+        switchData.curGroup = new Clutter.Actor();
+        switchData.movingWindowBin = new Clutter.Actor();
+        switchData.windows = [];
+        switchData.surroundings = {};
+        switchData.gestureActivated = false;
+        switchData.inProgress = false;
+        switchData.progress = 0;
+
+        switchData.container = new Clutter.Actor();
+        switchData.container.add_actor(switchData.curGroup);
+
+        wgroup.add_actor(switchData.movingWindowBin);
+        wgroup.add_actor(switchData.container);
+
+        let workspaceManager = global.workspace_manager;
+        let curWs = workspaceManager.get_workspace_by_index(from);
+
+        for (let dir of Object.values(Meta.MotionDirection)) {
+            let ws = null;
+
+            if (to < 0)
+                ws = curWs.get_neighbor(dir);
+            else if (dir == direction)
+                ws = workspaceManager.get_workspace_by_index(to);
+
+            if (ws == null || ws == curWs) {
+                switchData.surroundings[dir] = null;
+                continue;
+            }
+
+            let [x, y] = this._getPositionForDirection(dir, curWs, ws);
+            let info = { index: ws.index(),
+                         actor: new Clutter.Actor(),
+                         xDest: x,
+                         yDest: y };
+            switchData.surroundings[dir] = info;
+            switchData.container.add_actor(info.actor);
+            info.actor.raise_top();
+
+            info.actor.set_position(x, y);
+        }
+
+        switchData.movingWindowBin.raise_top();
+
+        for (let i = 0; i < windows.length; i++) {
+            let actor = windows[i];
+            let window = actor.get_meta_window();
+
+            if (!window.showing_on_its_workspace())
+                continue;
+
+            if (window.is_on_all_workspaces())
+                continue;
+
+            let record = { window: actor,
+                           parent: actor.get_parent() };
+
+            if (this.movingWindow && window == this.movingWindow) {
+                switchData.movingWindow = record;
+                switchData.windows.push(switchData.movingWindow);
+                actor.reparent(switchData.movingWindowBin);
+            } else if (window.get_workspace().index() == from) {
+                switchData.windows.push(record);
+                actor.reparent(switchData.curGroup);
+            } else {
+                let visible = false;
+                for (let dir of Object.values(Meta.MotionDirection)) {
+                    let info = switchData.surroundings[dir];
+
+                    if (!info || info.index != window.get_workspace().index())
+                        continue;
+
+                    switchData.windows.push(record);
+                    actor.reparent(info.actor);
+                    visible = true;
+                    break;
+                }
+
+                actor.visible = visible;
+            }
+        }
+
+        for (let i = 0; i < switchData.windows.length; i++) {
+            let w = switchData.windows[i];
+
+            w.windowDestroyId = w.window.connect('destroy', () => {
+                switchData.windows.splice(switchData.windows.indexOf(w), 1);
+            });
+        }
+    }
+
+    _finishWorkspaceSwitch(switchData) {
+        this._switchData = null;
+
+        for (let i = 0; i < switchData.windows.length; i++) {
+            let w = switchData.windows[i];
+
+            w.window.disconnect(w.windowDestroyId);
+            w.window.reparent(w.parent);
+
+            if (w.window.get_meta_window().get_workspace() !=
+                global.workspace_manager.get_active_workspace())
+                w.window.hide();
+        }
+        Tweener.removeTweens(switchData);
+        Tweener.removeTweens(switchData.container);
+        switchData.container.destroy();
+        switchData.movingWindowBin.destroy();
+
+        this.movingWindow = null;
+    }
+
+    animateSwitchWorkspace(shellwm, from, to, direction) {
+        this._prepareWorkspaceSwitch(from, to, direction);
+        this._switchData.inProgress = true;
+
+        let workspaceManager = global.workspace_manager;
+        let fromWs = workspaceManager.get_workspace_by_index(from);
+        let toWs = workspaceManager.get_workspace_by_index(to);
+
+        let [xDest, yDest] = this._getPositionForDirection(direction, fromWs, toWs);
+
+        /* @direction is the direction that the "camera" moves, so the
+         * screen contents have to move one screen's worth in the
+         * opposite direction.
+         */
+        xDest = -xDest;
+        yDest = -yDest;
+
+        Tweener.addTween(this._switchData,
+                         { progress: direction == Meta.MotionDirection.DOWN ? 1 : -1,
+                           time: WINDOW_ANIMATION_TIME,
+                           transition: 'easeOutCubic'
+                         });
+        Tweener.addTween(this._switchData.container,
+                         { x: xDest,
+                           y: yDest,
+                           time: WINDOW_ANIMATION_TIME,
+                           transition: 'easeOutCubic',
+                           onComplete: this._switchWorkspaceDone,
+                           onCompleteScope: this,
+                           onCompleteParams: [shellwm] });
+    }
+
+    _switchWorkspaceDone(shellwm) {
+        this._finishWorkspaceSwitch(this._switchData);
+        shellwm.completed_switch_workspace();
+    }
+
+    _directionForProgress(progress) {
+        if (global.workspace_manager.layout_rows == -1)
+            return (progress > 0) ? Meta.MotionDirection.DOWN : Meta.MotionDirection.UP;
+        else if (Clutter.get_default_text_direction () == Clutter.TextDirection.RTL)
+            return (progress > 0) ? Meta.MotionDirection.LEFT : Meta.MotionDirection.RIGHT;
+        else
+            return (progress > 0) ? Meta.MotionDirection.RIGHT : Meta.MotionDirection.LEFT;
+    }
+
+    _switchWorkspaceBegin(tracker, monitor) {
+        if (Meta.prefs_get_workspaces_only_on_primary() && monitor != Main.layoutManager.primaryIndex)
+            return;
+
+        let horiz = (global.workspace_manager.layout_rows != -1);
+        tracker.orientation = horiz ? Clutter.Orientation.HORIZONTAL : Clutter.Orientation.VERTICAL;
+
+        let workspaceManager = global.workspace_manager;
+        let activeWorkspace = workspaceManager.get_active_workspace();
+
+        if (this._switchData && this._switchData.gestureActivated) {
+            Tweener.removeTweens(this._switchData);
+            Tweener.removeTweens(this._switchData.container);
+
+            tracker.continueSwipe(this._switchData.progress);
+            return;
+        }
+
+        this._prepareWorkspaceSwitch(activeWorkspace.index(), -1);
+
+        let baseDistance;
+        if (horiz)
+            baseDistance = global.screen_width;
+        else
+            baseDistance = global.screen_height - Main.panel.height;
+
+        let backExtent = 0;
+        let forwardExtent = 0;
+
+        let direction = this._directionForProgress(1);
+        let backInfo = this._switchData.surroundings[direction];
+        if (!horiz && (backInfo != null))
+            backExtent = backInfo.yDest - baseDistance;
+
+        direction = this._directionForProgress(-1);
+        let forwardInfo = this._switchData.surroundings[direction];
+        if (!horiz && (forwardInfo != null))
+            forwardExtent = -forwardInfo.yDest - baseDistance;
+
+        if (global.workspace_manager.layout_rows != -1 &&
+            Clutter.get_default_text_direction () == Clutter.TextDirection.RTL) {
+            backExtent = -backExtent;
+            forwardExtent = -forwardExtent;
+        }
+
+        tracker.confirmSwipe((backInfo != null), (forwardInfo != null), baseDistance, backExtent, 
forwardExtent);
+    }
+
+    _switchWorkspaceUpdate(_tracker, progress) {
+        if (!this._switchData)
+            return;
+
+        this._switchData.progress = progress;
+
+        let direction = this._directionForProgress(progress);
+        let info = this._switchData.surroundings[direction];
+        let distance = 0;
+        let xPos = 0;
+        let yPos = 0;
+        if (info) {
+            if (global.workspace_manager.layout_rows == -1)
+                yPos = Math.round(Math.abs(progress) * -info.yDest);
+            else
+                xPos = Math.round(Math.abs(progress) * -info.xDest);
+        }
+
+        this._switchData.container.set_position(xPos, yPos);
+    }
+
+    _switchWorkspaceEnd(_tracker, duration, endProgress) {
+        if (!this._switchData)
+            return;
+
+        let workspaceManager = global.workspace_manager;
+        let activeWorkspace = workspaceManager.get_active_workspace();
+        let newWs = activeWorkspace;
+        let xDest = 0;
+        let yDest = 0;
+        if (endProgress != 0) {
+            let direction = this._directionForProgress(endProgress);
+            newWs = activeWorkspace.get_neighbor(direction);
+            xDest = -this._switchData.surroundings[direction].xDest;
+            yDest = -this._switchData.surroundings[direction].yDest;
+        }
+
+        if (duration == 0) {
+            if (newWs != activeWorkspace)
+                newWs.activate(global.get_current_time());
+            this._switchWorkspaceStop();
+            return;
+        }
+
+        let switchData = this._switchData;
+        switchData.gestureActivated = true;
+
+        Tweener.addTween(switchData,
+                         { progress: endProgress,
+                           time: duration,
+                           transition: 'easeOutCubic'
+                         });
+        Tweener.addTween(switchData.container,
+                         { x: xDest,
+                           y: yDest,
+                           time: duration,
+                           transition: 'easeOutCubic',
+                           onComplete: () => {
+                               if (newWs != activeWorkspace)
+                                   newWs.activate(global.get_current_time());
+                               this._finishWorkspaceSwitch(switchData);
+                           }
+                         });
+    }
+
+    _switchWorkspaceStop() {
+        this._switchData.progress = 0;
+        this._switchData.container.x = 0;
+        this._switchData.container.y = 0;
+        this._finishWorkspaceSwitch(this._switchData);
+    }
+
+    isAnimating() {
+        return this._switchData != null;
+    }
+
+    set movingWindow(movingWindow) {
+        this._movingWindow = movingWindow;
+    }
+
+    get movingWindow() {
+        return this._movingWindow;
+    }
+};


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