KeyboardLayoutButton.qml: add property for Long layout Name

make the component usable for systray applet implementation

FEATURE:
CCBUG: 390079
P-D commit: "Keyboard Layout applet"
plasma-desktop!181

components/workspace/KeyboardLayoutButton.qml

-/***************************************************************************
- *   Copyright (C) 2014 by Daniel Vrátil <dvratil@redhat.com>              *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
- *   GNU General Public License for more details.                          *
- *                                                                         *
- *   You should have received a copy of the GNU General Public License     *
- *   along with this program; if not, write to the                         *
- *   Free Software Foundation, Inc.,                                       *
- *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *
- ***************************************************************************/
-
-import QtQuick 2.1
-import QtQuick.Controls 1.1 as QQC
+/*
+ * SPDX-FileCopyrightText: 2014 Daniel Vrátil <dvratil@redhat.com>
+ * SPDX-FileCopyrightText: 2020 Andrey Butirsky <butirsky@gmail.com>
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
 
+import QtQuick 2.12
 import org.kde.plasma.components 3.0 as PlasmaComponents3
-
 import org.kde.plasma.workspace.keyboardlayout 1.0
 
 PlasmaComponents3.ToolButton {
     id: kbLayoutButton
 
-    icon.name: "input-keyboard"
-    text: layout.currentLayoutDisplayName
+    property alias layoutShortName: layout.currentLayoutDisplayName
+    property alias layoutLongName: layout.currentLayoutLongName
+    readonly property bool hasMultipleKeyboardLayouts: layout.layouts.length > 1
 
-    Accessible.name: i18ndc("plasma_lookandfeel_org.kde.lookandfeel", "Button to change keyboard layout", "Switch layout")
+    text: layoutLongName
+    visible: hasMultipleKeyboardLayouts
 
-    visible: layout.layouts.length > 1
+    Accessible.name: i18ndc("plasma_lookandfeel_org.kde.lookandfeel", "Button to change keyboard layout", "Switch layout")
+    icon.name: "input-keyboard"
 
     onClicked: layout.nextLayout()
 
     KeyboardLayout {
-          id: layout
-              function nextLayout() {
-              var layouts = layout.layouts;
-              var index = (layouts.indexOf(layout.currentLayout)+1) % layouts.length;
-              layout.currentLayout = layouts[index];
-          }
+        id: layout
+        function nextLayout() {
+            var layouts = layout.layouts;
+            var index = (layouts.indexOf(layout.currentLayout)+1) % layouts.length;
+            layout.currentLayout = layouts[index];
+        }
     }
 }