1 files changed, 159 insertions, 0 deletions
diff --git a/js/misc/keyboardManager.js b/js/misc/keyboardManager.js
new file mode 100644
index 0000000..29fc3b7
--- /dev/null
+++ b/js/misc/keyboardManager.js
@@ -0,0 +1,159 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+/* exported getKeyboardManager, holdKeyboard, releaseKeyboard */
+
+const { GLib, GnomeDesktop } = imports.gi;
+
+const Main = imports.ui.main;
+
+var DEFAULT_LOCALE = 'en_US';
+var DEFAULT_LAYOUT = 'us';
+var DEFAULT_VARIANT = '';
+
+let _xkbInfo = null;
+
+function getXkbInfo() {
+    if (_xkbInfo == null)
+        _xkbInfo = new GnomeDesktop.XkbInfo();
+    return _xkbInfo;
+}
+
+let _keyboardManager = null;
+
+function getKeyboardManager() {
+    if (_keyboardManager == null)
+        _keyboardManager = new KeyboardManager();
+    return _keyboardManager;
+}
+
+function releaseKeyboard() {
+    if (Main.modalCount > 0)
+        global.display.unfreeze_keyboard(global.get_current_time());
+    else
+        global.display.ungrab_keyboard(global.get_current_time());
+}
+
+function holdKeyboard() {
+    global.display.freeze_keyboard(global.get_current_time());
+}
+
+var KeyboardManager = class {
+    constructor() {
+        // The XKB protocol doesn't allow for more that 4 layouts in a
+        // keymap. Wayland doesn't impose this limit and libxkbcommon can
+        // handle up to 32 layouts but since we need to support X clients
+        // even as a Wayland compositor, we can't bump this.
+        this.MAX_LAYOUTS_PER_GROUP = 4;
+
+        this._xkbInfo = getXkbInfo();
+        this._current = null;
+        this._localeLayoutInfo = this._getLocaleLayout();
+        this._layoutInfos = {};
+        this._currentKeymap = null;
+    }
+
+    _applyLayoutGroup(group) {
+        let options = this._buildOptionsString();
+        let [layouts, variants] = this._buildGroupStrings(group);
+
+        if (this._currentKeymap &&
+            this._currentKeymap.layouts == layouts &&
+            this._currentKeymap.variants == variants &&
+            this._currentKeymap.options == options)
+            return;
+
+        this._currentKeymap = { layouts, variants, options };
+        global.backend.set_keymap(layouts, variants, options);
+    }
+
+    _applyLayoutGroupIndex(idx) {
+        global.backend.lock_layout_group(idx);
+    }
+
+    apply(id) {
+        let info = this._layoutInfos[id];
+        if (!info)
+            return;
+
+        if (this._current && this._current.group == info.group) {
+            if (this._current.groupIndex != info.groupIndex)
+                this._applyLayoutGroupIndex(info.groupIndex);
+        } else {
+            this._applyLayoutGroup(info.group);
+            this._applyLayoutGroupIndex(info.groupIndex);
+        }
+
+        this._current = info;
+    }
+
+    reapply() {
+        if (!this._current)
+            return;
+
+        this._applyLayoutGroup(this._current.group);
+        this._applyLayoutGroupIndex(this._current.groupIndex);
+    }
+
+    setUserLayouts(ids) {
+        this._current = null;
+        this._layoutInfos = {};
+
+        for (let i = 0; i < ids.length; ++i) {
+            let [found, , , _layout, _variant] = this._xkbInfo.get_layout_info(ids[i]);
+            if (found)
+                this._layoutInfos[ids[i]] = { id: ids[i], layout: _layout, variant: _variant };
+        }
+
+        let i = 0;
+        let group = [];
+        for (let id in this._layoutInfos) {
+            // We need to leave one slot on each group free so that we
+            // can add a layout containing the symbols for the
+            // language used in UI strings to ensure that toolkits can
+            // handle mnemonics like Alt+Ф even if the user is
+            // actually typing in a different layout.
+            let groupIndex = i % (this.MAX_LAYOUTS_PER_GROUP - 1);
+            if (groupIndex == 0)
+                group = [];
+
+            let info = this._layoutInfos[id];
+            group[groupIndex] = info;
+            info.group = group;
+            info.groupIndex = groupIndex;
+
+            i += 1;
+        }
+    }
+
+    _getLocaleLayout() {
+        let locale = GLib.get_language_names()[0];
+        if (!locale.includes('_'))
+            locale = DEFAULT_LOCALE;
+
+        let [found, , id] = GnomeDesktop.get_input_source_from_locale(locale);
+        if (!found)
+            [, , id] = GnomeDesktop.get_input_source_from_locale(DEFAULT_LOCALE);
+
+        let _layout, _variant;
+        [found, , , _layout, _variant] = this._xkbInfo.get_layout_info(id);
+        if (found)
+            return { layout: _layout, variant: _variant };
+        else
+            return { layout: DEFAULT_LAYOUT, variant: DEFAULT_VARIANT };
+    }
+
+    _buildGroupStrings(_group) {
+        let group = _group.concat(this._localeLayoutInfo);
+        let layouts = group.map(g => g.layout).join(',');
+        let variants = group.map(g => g.variant).join(',');
+        return [layouts, variants];
+    }
+
+    setKeyboardOptions(options) {
+        this._xkbOptions = options;
+    }
+
+    _buildOptionsString() {
+        let options = this._xkbOptions.join(',');
+        return options;
+    }
+};