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

diff --git a/js/ui/status/keyboard.js b/js/ui/status/keyboard.js
index 590d2eeff3cb27338f0fa4d3cf89c7832c6484a6..f0914184666981b4fdec9254718997fe36e801eb 100644 (file)
--- 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