[gnome-shell] status/keyboard: Add input source switching per window

[Rui Matos <rtcm src gnome org>]

commit 16bb9c17f5c12a4e7b2230e6d5609095bc57eb0d
Author: Rui Matos <tiagomatos gmail com>
Date:   Wed Jan 9 02:01:33 2013 +0100

    status/keyboard: Add input source switching per window
    
    If the setting is enabled, we record the last activated input source
    for the currently focused window and switch to it when focusing back
    that window. The Overview is considered a window for this purpose.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=691414

 js/ui/status/keyboard.js |   85 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 85 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/status/keyboard.js b/js/ui/status/keyboard.js
index 590d2ee..f091418 100644
--- a/js/ui/status/keyboard.js
+++ b/js/ui/status/keyboard.js
@@ -366,6 +366,13 @@ const InputSourceIndicator = new Lang.Class({
         this._sessionUpdated();
 
         this.menu.addSettingsAction(_("Region and Language Settings"), 'gnome-region-panel.desktop');
+
+        this._sourcesPerWindow = false;
+        this._focusWindowNotifyId = 0;
+        this._overviewShowingId = 0;
+        this._overviewHiddenId = 0;
+        this._settings.connect('changed::per-window', Lang.bind(this, this._sourcesPerWindowChanged));
+        this._sourcesPerWindowChanged();
     },
 
     _sessionUpdated: function() {
@@ -431,6 +438,8 @@ const InputSourceIndicator = new Lang.Class({
                 this._mruSources = currentSource.concat(this._mruSources);
                 break;
             }
+
+        this._changePerWindowSource();
     },
 
     _inputSourcesChanged: function() {
@@ -704,6 +713,82 @@ const InputSourceIndicator = new Lang.Class({
         }
     },
 
+    _getNewInputSource: function(current) {
+        for (let i in this._inputSources) {
+            let is = this._inputSources[i];
+            if (is.type == current.type &&
+                is.id == current.id)
+                return is;
+        }
+        return this._currentSource;
+    },
+
+    _getCurrentWindow: function() {
+        if (Main.overview.visible)
+            return Main.overview;
+        else
+            return global.display.focus_window;
+    },
+
+    _setPerWindowInputSource: function() {
+        let window = this._getCurrentWindow();
+        if (!window)
+            return;
+
+        if (!window._inputSources) {
+            window._inputSources = this._inputSources;
+            window._currentSource = this._currentSource;
+        } else if (window._inputSources == this._inputSources) {
+            window._currentSource.activate();
+        } else {
+            window._inputSources = this._inputSources;
+            window._currentSource = this._getNewInputSource(window._currentSource);
+            window._currentSource.activate();
+        }
+    },
+
+    _sourcesPerWindowChanged: function() {
+        this._sourcesPerWindow = this._settings.get_boolean('per-window');
+
+        if (this._sourcesPerWindow && this._focusWindowNotifyId == 0) {
+            this._focusWindowNotifyId = global.display.connect('notify::focus-window',
+                                                               Lang.bind(this, this._setPerWindowInputSource));
+            this._overviewShowingId = Main.overview.connect('showing',
+                                                            Lang.bind(this, this._setPerWindowInputSource));
+            this._overviewHiddenId = Main.overview.connect('hidden',
+                                                           Lang.bind(this, this._setPerWindowInputSource));
+        } else if (!this._sourcesPerWindow && this._focusWindowNotifyId != 0) {
+            global.display.disconnect(this._focusWindowNotifyId);
+            this._focusWindowNotifyId = 0;
+            Main.overview.disconnect(this._overviewShowingId);
+            this._overviewShowingId = 0;
+            Main.overview.disconnect(this._overviewHiddenId);
+            this._overviewHiddenId = 0;
+
+            let windows = global.get_window_actors().map(function(w) {
+                return w.meta_window;
+            });
+            for (let i = 0; i < windows.length; ++i) {
+                delete windows[i]._inputSources;
+                delete windows[i]._currentSource;
+            }
+            delete Main.overview._inputSources;
+            delete Main.overview._currentSource;
+        }
+    },
+
+    _changePerWindowSource: function() {
+        if (!this._sourcesPerWindow)
+            return;
+
+        let window = this._getCurrentWindow();
+        if (!window)
+            return;
+
+        window._inputSources = this._inputSources;
+        window._currentSource = this._currentSource;
+    },
+
     _containerGetPreferredWidth: function(container, for_height, alloc) {
         // Here, and in _containerGetPreferredHeight, we need to query
         // for the height of all children, but we ignore the results