[gnome-shell/wip/exalm/gestures-part-1] workspaceThumbnail: Sync indicator with WorkspacesDisplay

[Alexander Mikhaylenko <alexm src gnome org>]

commit 357e3fd38254f9fe07a839882d31fb703204bbb1
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Mon Jul 8 13:03:20 2019 +0500

    workspaceThumbnail: Sync indicator with WorkspacesDisplay
    
    Now that both ThumbnailsBox and WorkspacesDisplay use single adjustments for
    controlling indicator and scrolling, create the adjustment in OverviewControls
    and pass it to both objects, effectively syncing indicator to scrolling.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/821

 js/ui/overviewControls.js   | 28 ++++++++++++++++++++++++++--
 js/ui/viewSelector.js       |  5 +++--
 js/ui/workspaceThumbnail.js | 44 ++++++++++----------------------------------
 js/ui/workspacesView.js     | 15 ++-------------
 4 files changed, 41 insertions(+), 51 deletions(-)
---
diff --git a/js/ui/overviewControls.js b/js/ui/overviewControls.js
index 687dc78887..82f810e8e6 100644
--- a/js/ui/overviewControls.js
+++ b/js/ui/overviewControls.js
@@ -436,11 +436,26 @@ class ControlsManager extends St.Widget {
         this._dashSpacer = new DashSpacer();
         this._dashSpacer.setDashActor(this._dashSlider);
 
-        this._thumbnailsBox = new WorkspaceThumbnail.ThumbnailsBox();
+        let workspaceManager = global.workspace_manager;
+        let activeWorkspaceIndex = workspaceManager.get_active_workspace_index();
+
+        this._workspaceAdjustment = new St.Adjustment({
+            value: activeWorkspaceIndex,
+            lower: 0,
+            page_increment: 1,
+            page_size: 1,
+            step_increment: 0,
+            upper: workspaceManager.n_workspaces,
+        });
+        workspaceManager.connect('notify::n-workspaces',
+            this._updateWorkspaces.bind(this));
+
+        this._thumbnailsBox =
+            new WorkspaceThumbnail.ThumbnailsBox(this._workspaceAdjustment);
         this._thumbnailsSlider = new ThumbnailsSlider(this._thumbnailsBox);
 
         this.viewSelector = new ViewSelector.ViewSelector(searchEntry,
-                                                          this.dash.showAppsButton);
+            this._workspaceAdjustment, this.dash.showAppsButton);
         this.viewSelector.connect('page-changed', this._setVisibility.bind(this));
         this.viewSelector.connect('page-empty', this._onPageEmpty.bind(this));
 
@@ -459,6 +474,15 @@ class ControlsManager extends St.Widget {
         Main.overview.connect('showing', this._updateSpacerVisibility.bind(this));
     }
 
+    _updateWorkspaces() {
+        let workspaceManager = global.workspace_manager;
+        let newNumWorkspaces = workspaceManager.n_workspaces;
+
+        this._workspaceAdjustment.upper = newNumWorkspaces;
+        this._workspaceAdjustment.value =
+            workspaceManager.get_active_workspace_index();
+    }
+
     _updateWorkspacesGeometry() {
         let [x, y] = this.get_transformed_position();
         let [width, height] = this.get_transformed_size();
diff --git a/js/ui/viewSelector.js b/js/ui/viewSelector.js
index 3be94df24d..8acea0c03d 100644
--- a/js/ui/viewSelector.js
+++ b/js/ui/viewSelector.js
@@ -128,7 +128,7 @@ var ViewSelector = GObject.registerClass({
         'page-empty': {},
     },
 }, class ViewSelector extends Shell.Stack {
-    _init(searchEntry, showAppsButton) {
+    _init(searchEntry, workspaceAdjustment, showAppsButton) {
         super._init({
             name: 'viewSelector',
             x_expand: true,
@@ -171,7 +171,8 @@ var ViewSelector = GObject.registerClass({
         this._iconClickedId = 0;
         this._capturedEventId = 0;
 
-        this._workspacesDisplay = new WorkspacesView.WorkspacesDisplay();
+        this._workspacesDisplay =
+            new WorkspacesView.WorkspacesDisplay(workspaceAdjustment);
         this._workspacesPage = this._addPage(this._workspacesDisplay,
                                              _("Windows"), 'focus-windows-symbolic');
 
diff --git a/js/ui/workspaceThumbnail.js b/js/ui/workspaceThumbnail.js
index 53cd513c9e..b56d05f61c 100644
--- a/js/ui/workspaceThumbnail.js
+++ b/js/ui/workspaceThumbnail.js
@@ -7,7 +7,6 @@ const Background = imports.ui.background;
 const DND = imports.ui.dnd;
 const Main = imports.ui.main;
 const Workspace = imports.ui.workspace;
-const WorkspacesView = imports.ui.workspacesView;
 
 // The maximum size of a thumbnail is 1/10 the width and height of the screen
 let MAX_THUMBNAIL_SCALE = 1 / 10.;
@@ -628,7 +627,7 @@ var ThumbnailsBox = GObject.registerClass({
             0, Infinity, 0),
     },
 }, class ThumbnailsBox extends St.Widget {
-    _init() {
+    _init(scrollAdjustment) {
         super._init({ reactive: true,
                       style_class: 'workspace-thumbnails',
                       request_mode: Clutter.RequestMode.WIDTH_FOR_HEIGHT });
@@ -701,18 +700,17 @@ var ThumbnailsBox = GObject.registerClass({
         this._syncStackingId = 0;
         this._workareasChangedId = 0;
 
-        let workspaceManager = global.workspace_manager;
-        let activeWorkspaceIndex = workspaceManager.get_active_workspace_index();
-        this._scrollAdjustment = new St.Adjustment({
-            value: activeWorkspaceIndex,
-            lower: 0,
-            page_increment: 1,
-            page_size: 1,
-            step_increment: 0,
-            upper: workspaceManager.n_workspaces
-        });
+        this._scrollAdjustment = scrollAdjustment;
 
         this._scrollAdjustment.connect('notify::value', adj => {
+            let workspaceManager = global.workspace_manager;
+            let activeIndex = workspaceManager.get_active_workspace_index();
+
+            this._animatingIndicator = adj.value !== activeIndex;
+
+            if (!this._animatingIndicator)
+                this._queueUpdateStates();
+
             this.queue_relayout();
         });
     }
@@ -915,9 +913,6 @@ var ThumbnailsBox = GObject.registerClass({
     _createThumbnails() {
         let workspaceManager = global.workspace_manager;
 
-        this._switchWorkspaceNotifyId =
-            global.window_manager.connect('switch-workspace',
-                                          this._activeWorkspaceChanged.bind(this));
         this._nWorkspacesNotifyId =
             workspaceManager.connect('notify::n-workspaces',
                                      this._workspacesChanged.bind(this));
@@ -950,10 +945,6 @@ var ThumbnailsBox = GObject.registerClass({
         if (this._thumbnails.length == 0)
             return;
 
-        if (this._switchWorkspaceNotifyId > 0) {
-            global.window_manager.disconnect(this._switchWorkspaceNotifyId);
-            this._switchWorkspaceNotifyId = 0;
-        }
         if (this._nWorkspacesNotifyId > 0) {
             let workspaceManager = global.workspace_manager;
             workspaceManager.disconnect(this._nWorkspacesNotifyId);
@@ -982,8 +973,6 @@ var ThumbnailsBox = GObject.registerClass({
         let oldNumWorkspaces = validThumbnails.length;
         let newNumWorkspaces = workspaceManager.n_workspaces;
 
-        this._scrollAdjustment.upper = newNumWorkspaces;
-
         if (newNumWorkspaces > oldNumWorkspaces) {
             this.addThumbnails(oldNumWorkspaces, newNumWorkspaces - oldNumWorkspaces);
         } else {
@@ -1368,17 +1357,4 @@ var ThumbnailsBox = GObject.registerClass({
         childBox.y2 = indicatorY2 + indicatorBottomFullBorder;
         this._indicator.allocate(childBox, flags);
     }
-
-    _activeWorkspaceChanged(_wm, from, to, _direction) {
-        this._scrollAdjustment.value = from;
-        this._animatingIndicator = true;
-        this._scrollAdjustment.ease(to, {
-            progress_mode: Clutter.AnimationMode.EASE_OUT_QUAD,
-            duration: WorkspacesView.WORKSPACE_SWITCH_TIME,
-            onComplete: () => {
-                this._animatingIndicator = false;
-                this._queueUpdateStates();
-            },
-        });
-    }
 });
diff --git a/js/ui/workspacesView.js b/js/ui/workspacesView.js
index c637b7b933..8660cacdda 100644
--- a/js/ui/workspacesView.js
+++ b/js/ui/workspacesView.js
@@ -410,23 +410,12 @@ class ExtraWorkspaceView extends WorkspacesViewBase {
 
 var WorkspacesDisplay = GObject.registerClass(
 class WorkspacesDisplay extends St.Widget {
-    _init() {
+    _init(scrollAdjustment) {
         super._init({ clip_to_allocation: true });
         this.connect('notify::allocation', this._updateWorkspacesActualGeometry.bind(this));
 
         let workspaceManager = global.workspace_manager;
-        let activeWorkspaceIndex = workspaceManager.get_active_workspace_index();
-        this._scrollAdjustment = new St.Adjustment({
-            value: activeWorkspaceIndex,
-            lower: 0,
-            page_increment: 1,
-            page_size: 1,
-            step_increment: 0,
-            upper: workspaceManager.n_workspaces
-        });
-
-        workspaceManager.bind_property('n-workspaces',
-            this._scrollAdjustment, 'upper', GObject.BindingFlags.SYNC_CREATE);
+        this._scrollAdjustment = scrollAdjustment;
 
         this._switchWorkspaceId =
             global.window_manager.connect('switch-workspace',