Handle keyboard in QML

src/magnum_item.cpp

@@ -27,6 +27,7 @@ public:
     m_renderer->t(mitem->t());
     m_renderer->hue(mitem->hue());
     m_renderer->count(mitem->count());
+    m_renderer->lagging(mitem->lagging());
   }
 
   QOpenGLFramebufferObject *createFramebufferObject(const QSize &size) override {
@@ -87,52 +88,37 @@ void MagnumItem::setCount(qint8 count) {
   update();
 }
 
-void MagnumItem::keyPressEvent(QKeyEvent *evt) {
-  switch (evt->key()) {
-  case Qt::Key_L:
-    auto camera = m_renderer->camera();
-    if (camera) {
-      if (camera->lagging() > 0.0f) {
-        camera->setLagging(0.0f);
-      } else {
-        camera->setLagging(0.85f);
-      }
-    }
-    break;
-  }
-  evt->accept();
+void MagnumItem::setLagging(qreal lagging) {
+  if (lagging == m_lagging) return;
+  m_lagging = lagging;
+  emit laggingChanged();
+  update();
 }
 
 void MagnumItem::mousePressEvent(QMouseEvent *evt) {
-  if (auto camera = m_renderer->camera()) {
+  if (auto& camera = m_renderer->camera()) {
     camera->initTransformation({evt->pos().x(), evt->pos().y()});
   }
-  evt->accept();
-}
-
-void MagnumItem::mouseReleaseEvent(QMouseEvent *evt) {
-  evt->accept();
 }
 
 void MagnumItem::mouseMoveEvent(QMouseEvent *evt) {
   if (!evt->buttons())
     return;
-  if (auto camera = m_renderer->camera()) {
+  if (auto& camera = m_renderer->camera()) {
     if (evt->modifiers() & Qt::ShiftModifier) {
       camera->translate({evt->pos().x(), evt->pos().y()});
     } else {
       camera->rotate({evt->pos().x(), evt->pos().y()});
     }
   }
-  evt->accept();
 }
 
 void MagnumItem::wheelEvent(QWheelEvent *evt) {
-  if (auto camera = m_renderer->camera()) {
+  if (auto& camera = m_renderer->camera()) {
     const Float delta = evt->delta();
     if (Math::abs(delta) < 1.0e-2f)
       return;
-    camera->zoom(delta);
+    camera->zoom(delta*.01f);
   }
 }