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.cpp

@@ -0,0 +1,145 @@
+/*
+ * 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 "config.h"
+
+#include <QtGlobal>
+#include <QObject>
+#include <QApplication>
+#include <QAbstractEventDispatcher>
+#include <QPair>
+#include <QHash>
+#include <QtDebug>
+
+#include "core/logging.h"
+
+#include "globalshortcutbackend.h"
+#include "globalshortcut.h"
+
+GlobalShortcut *GlobalShortcut::initialized_ = nullptr;
+QHash<QPair<quint32, quint32>, GlobalShortcut*> GlobalShortcut::internal_shortcuts_;
+
+GlobalShortcut::GlobalShortcut(QObject *parent) : QObject(parent),
+  qt_key_(Qt::Key(0)),
+  qt_mods_(Qt::NoModifier),
+  native_key_(0),
+  native_mods_(0) {
+
+  Q_ASSERT(!initialized_);
+
+  QAbstractEventDispatcher::instance()->installNativeEventFilter(this);
+  initialized_ = this;
+
+}
+
+GlobalShortcut::GlobalShortcut(QKeySequence shortcut, GlobalShortcutBackend *backend, QObject *parent) : QObject(parent),
+  backend_(backend),
+  shortcut_(shortcut),
+  qt_key_(Qt::Key(0)),
+  qt_mods_(Qt::NoModifier),
+  native_key_(0),
+  native_mods_(0) {
+
+  Q_ASSERT(initialized_);
+  setShortcut(shortcut);
+
+}
+
+GlobalShortcut::~GlobalShortcut() {
+  if (this == initialized_) {
+    QAbstractEventDispatcher::instance()->removeNativeEventFilter(this);
+    initialized_ = nullptr;
+  }
+  else {
+    unsetShortcut();
+  }
+}
+
+bool GlobalShortcut::setShortcut(const QKeySequence &shortcut) {
+
+  Q_ASSERT(initialized_);
+
+  if (shortcut.isEmpty()) return false;
+  shortcut_ = shortcut;
+
+  Qt::KeyboardModifiers all_mods = Qt::ShiftModifier | Qt::ControlModifier | Qt::AltModifier | Qt::MetaModifier;
+  qt_key_ = Qt::Key((shortcut[0] ^ all_mods) & shortcut[0]);
+  qt_mods_ = Qt::KeyboardModifiers(shortcut[0] & all_mods);
+
+  native_key_ = nativeKeycode(qt_key_);
+  if (native_key_ == 0) return false;
+  native_mods_ = nativeModifiers(qt_mods_);
+
+  bool result = registerShortcut(native_key_, native_mods_);
+  if (result) {
+    internal_shortcuts_.insert(qMakePair(native_key_, native_mods_), this);
+  }
+  else {
+    qLog(Error) << "Failed to register shortcut" << shortcut_.toString();
+  }
+
+  qLog(Info) << "Registered shortcut" << shortcut_.toString();
+
+  return result;
+
+}
+
+bool GlobalShortcut::unsetShortcut() {
+
+  Q_ASSERT(initialized_);
+
+  QPair<quint32, quint32> hash = qMakePair(native_key_, native_mods_);
+  if (internal_shortcuts_.contains(hash)) {
+    GlobalShortcut *gshortcut = internal_shortcuts_.value(hash);
+    if (gshortcut != this) return false;
+  }
+
+  bool result = unregisterShortcut(native_key_, native_mods_);
+  if (result) {
+    if (internal_shortcuts_.contains(hash)) {
+      internal_shortcuts_.remove(hash);
+    }
+    qLog(Info) << "Unregister shortcut" << shortcut_.toString();
+  }
+  else {
+    qLog(Error) << "Failed to unregister shortcut:" << shortcut_.toString();
+  }
+
+  qt_key_ = Qt::Key(0);
+  qt_mods_ = Qt::KeyboardModifiers(0);
+  native_key_ = 0;
+  native_mods_ = 0;
+
+  return result;
+
+}
+
+void GlobalShortcut::activateShortcut(quint32 native_key, quint32 native_mod) {
+
+  Q_ASSERT(initialized_);
+
+  QPair<quint32, quint32> hash = qMakePair(native_key, native_mod);
+  if (!internal_shortcuts_.contains(hash)) return;
+
+  GlobalShortcut *gshortcut = internal_shortcuts_.value(hash);
+  if (gshortcut && gshortcut != initialized_) {
+    emit gshortcut->activated();
+  }
+
+}