Add new global shortcut system backend for X11 and Windows

- Remove qxt
- Also create an option for enabled/disabling shortcuts through X11.

src/globalshortcuts/globalshortcut-win.cpp

@@ -0,0 +1,76 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2018, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry 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 Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QtGlobal>
+#include <QObject>
+#include <QAbstractEventDispatcher>
+#include <QByteArray>
+
+#include <qt_windows.h>
+
+#include "core/logging.h"
+
+#include "globalshortcuts.h"
+#include "globalshortcutbackend.h"
+#include "globalshortcut.h"
+#include "keymapper_win.h"
+
+quint32 GlobalShortcut::nativeModifiers(Qt::KeyboardModifiers qt_mods) {
+
+  quint32 native_mods = 0;
+  if (qt_mods & Qt::ShiftModifier) native_mods |= MOD_SHIFT;
+  if (qt_mods & Qt::ControlModifier) native_mods |= MOD_CONTROL;
+  if (qt_mods & Qt::AltModifier) native_mods |= MOD_ALT;
+  if (qt_mods & Qt::MetaModifier) native_mods |= MOD_WIN;
+  return native_mods;
+
+}
+
+quint32 GlobalShortcut::nativeKeycode(Qt::Key qt_key) {
+
+  quint32 key_code = 0;
+  if (KeyMapperWin::keymapper_win_.contains(qt_key)) {
+    key_code = KeyMapperWin::keymapper_win_.value(qt_key);
+  }
+  return key_code;
+
+}
+
+bool GlobalShortcut::registerShortcut(quint32 native_key, quint32 native_mods) {
+  return RegisterHotKey(0, native_mods ^ native_key, native_mods, native_key);
+}
+
+bool GlobalShortcut::unregisterShortcut(quint32 native_key, quint32 native_mods) {
+  return UnregisterHotKey(0, native_mods ^ native_key);
+}
+
+bool GlobalShortcut::nativeEventFilter(const QByteArray &eventtype, void *message, long *result) {
+
+  Q_UNUSED(eventtype);
+  Q_UNUSED(result);
+
+  MSG *msg = static_cast<MSG*>(message);
+  if (msg->message != WM_HOTKEY) return false;
+
+  quint32 key_code = HIWORD(msg->lParam);
+  quint32 modifiers = LOWORD(msg->lParam);
+  activateShortcut(key_code, modifiers);
+  return true;
+
+}