UX: handle boxes widget key events #324

1. when entering boxes widget we set focus to get key events (clear focus when leaving)
2. if hover state is true we forward key events to main window
3. main window will process supported key events for current canvas

src/app/GUI/BoxesList/boxsinglewidget.cpp

@@ -736,16 +736,26 @@ void BoxSingleWidget::mouseReleaseEvent(QMouseEvent *event)
 
 void BoxSingleWidget::enterEvent(QEvent *)
 {
+    setFocus();
     mHover = true;
     update();
 }
 
 void BoxSingleWidget::leaveEvent(QEvent *)
 {
+    clearFocus();
     mHover = false;
     update();
 }
 
+void BoxSingleWidget::keyPressEvent(QKeyEvent *event)
+{
+    if (mHover) {
+        MainWindow::sGetInstance()->processCanvasWindowKeyEvent(event);
+    }
+    SingleWidget::keyPressEvent(event);
+}
+
 void BoxSingleWidget::mouseDoubleClickEvent(QMouseEvent *e)
 {
     Q_UNUSED(e)

src/app/GUI/BoxesList/boxsinglewidget.h

@@ -104,6 +104,8 @@ class BoxSingleWidget : public SingleWidget {
     void enterEvent(QEvent *);
     void leaveEvent(QEvent *);
 
+    void keyPressEvent(QKeyEvent *event);
+
     void paintEvent(QPaintEvent *);
     void mouseDoubleClickEvent(QMouseEvent *e);
     void resizeEvent(QResizeEvent *);

src/app/GUI/mainwindow.cpp

@@ -1644,6 +1644,30 @@ bool MainWindow::processKeyEvent(QKeyEvent *event)
     return false;
 }
 
+bool MainWindow::processCanvasWindowKeyEvent(QKeyEvent *event)
+{
+#ifdef Q_OS_MAC
+    if (event->type() == QEvent::ShortcutOverride) { return false; }
+#endif
+    const bool ctrl = event->modifiers() & Qt::ControlModifier;
+    if (ctrl && event->key() == Qt::Key_V) {
+        if (event->isAutoRepeat()) { return false; }
+        (*mActions.pasteAction)();
+    } else if (ctrl && event->key() == Qt::Key_C) {
+        if (event->isAutoRepeat()) { return false; }
+        (*mActions.copyAction)();
+    } else if (ctrl && event->key() == Qt::Key_D) {
+        if (event->isAutoRepeat()) { return false; }
+        (*mActions.duplicateAction)();
+    } else if (ctrl && event->key() == Qt::Key_X) {
+        if (event->isAutoRepeat()) { return false; }
+        (*mActions.cutAction)();
+    } else if (event->key() == Qt::Key_Delete) {
+        (*mActions.deleteAction)();
+    } else { return false; }
+    return true;
+}
+
 void MainWindow::readSettings(const QString &openProject)
 {
     mUI->readSettings();

src/app/GUI/mainwindow.h

@@ -129,6 +129,7 @@ class MainWindow : public QMainWindow
     stdsptr<void> lock();
 
     bool processKeyEvent(QKeyEvent *event);
+    bool processCanvasWindowKeyEvent(QKeyEvent *event);
 
     void installNumericFilter(QObject* const object) {
         object->installEventFilter(mNumericFilter);