[OSD] Add OSD for when on-screen keyboard is enabled/disabled

This is to provide feedback when the on-screen keyboard is enabled or disabled in response
to the user taking some action, such as flipping over a convertible laptop.

Differential Revision: https://phabricator.kde.org/D1563

shell/osd.cpp

@@ -142,6 +142,15 @@ void Osd::wwanEnabledChanged(bool wwanEnabled)
     }
 }
 
+void Osd::virtualKeyboardEnabledChanged(bool virtualKeyboardEnabled)
+{
+    if (virtualKeyboardEnabled) {
+        showText(QStringLiteral("input-keyboard-virtual-on"), i18nc("on screen keyboard was enabled because physical keyboard got unplugged, keep short", "On-Screen Keyboard Activated"));
+    } else {
+        showText(QStringLiteral("input-keyboard-virtual-off"), i18nc("on screen keyboard was disabled because physical keyboard was plugged in, keep short", "On-Screen Keyboard Deactivated"));
+    }
+}
+
 bool Osd::init()
 {
     if (m_osdObject && m_osdObject->rootObject()) {

shell/osd.h

@@ -50,6 +50,7 @@ public Q_SLOTS:
     void wifiEnabledChanged(bool wifiEnabled);
     void bluetoothEnabledChanged(bool bluetoothEnabled);
     void wwanEnabledChanged(bool wwanEnabled);
+    void virtualKeyboardEnabledChanged(bool virtualKeyboardEnabled);
 
 Q_SIGNALS:
     void osdProgress(const QString &icon, const int percent, const QString &additionalText);