feat: use spacebar to quit app

mainwindow.cpp

@@ -14,6 +14,7 @@
 #include <QStyle>
 #include <QScreen>
 #include <QMenu>
+#include <QShortcut>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -101,6 +102,10 @@ MainWindow::MainWindow(QWidget *parent) :
     m_gv->setOpacity(0, false);
     m_closeButton->setOpacity(0, false);
 
+    QShortcut * quitAppShorucut = new QShortcut(QKeySequence(Qt::Key_Space), this);
+    connect(quitAppShorucut, &QShortcut::activated,
+            std::bind(&MainWindow::quitAppAction, this, false));
+
     centerWindow();
 }
 
@@ -202,9 +207,7 @@ void MainWindow::mouseReleaseEvent(QMouseEvent *event)
 
 void MainWindow::mouseDoubleClickEvent(QMouseEvent *event)
 {
-    if (!m_protectedMode) {
+    quitAppAction();
-        closeWindow();
-    }
 
     return QMainWindow::mouseDoubleClickEvent(event);
 }
@@ -395,3 +398,10 @@ bool MainWindow::stayOnTop()
 {
     return windowFlags().testFlag(Qt::WindowStaysOnTopHint);
 }
+
+void MainWindow::quitAppAction(bool force)
+{
+    if (!m_protectedMode || force) {
+        closeWindow();
+    }
+}

mainwindow.h

@@ -46,6 +46,7 @@ protected slots:
     void toggleProtectedMode();
     void toggleStayOnTop();
     bool stayOnTop();
+    void quitAppAction(bool force = false);
 
 private:
     QPoint m_oldMousePos;