AppSwitcher: dynamically adjust to screen shape

Follow window resize and adjust accordingly

src/app-switcher.cpp

@@ -44,7 +44,7 @@
 AppSwitcher::AppSwitcher(QWidget* parent)
     : QListView(parent)
 {
-    setWindowFlags(Qt::Dialog | Qt::WindowStaysOnTopHint | Qt::CustomizeWindowHint);
+    //setWindowFlags(Qt::Dialog | Qt::WindowStaysOnTopHint | Qt::CustomizeWindowHint);
     setObjectName("AppSwitcher");
 
     m_globalShortcut = GlobalKeyShortcut::Client::instance()->addAction(
@@ -71,7 +71,7 @@ AppSwitcher::AppSwitcher(QWidget* parent)
     m_delegate = new AppItemDelegate(this);
     setItemDelegate(m_delegate);
     setContentsMargins(5, 5, 5, 5);
-    setOrientation(Qt::Vertical);
+    setOrientation(Qt::Vertical, true);
 
     m_timer = new QTimer(this);
     m_timer->setInterval(100);
@@ -125,11 +125,15 @@ void AppSwitcher::showSwitcher(bool forward)
     m_timer->start();
 }
 
-void AppSwitcher::setOrientation(Qt::Orientation orientation)
+void AppSwitcher::setOrientation(Qt::Orientation orientation, bool force)
 {
-    m_delegate->setOrientation(orientation);
+    if(!force && m_orientation == orientation)
+        return;
 
-    if(orientation == Qt::Horizontal)
+    m_orientation = orientation;
+    m_delegate->setOrientation(m_orientation);
+
+    if(m_orientation == Qt::Horizontal)
     {
         setFlow(QListView::LeftToRight);
         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
@@ -143,6 +147,13 @@ void AppSwitcher::setOrientation(Qt::Orientation orientation)
     }
 }
 
+Qt::Orientation AppSwitcher::calculateBestOrientation()
+{
+    if(height() > width())
+        return Qt::Vertical;
+    return Qt::Horizontal;
+}
+
 void AppSwitcher::selectItem(bool forward)
 {
     m_timer->start();
@@ -168,13 +179,13 @@ void AppSwitcher::activateWindow(WId id)
     KX11Extras::forceActiveWindow(id);
 }
 
-void AppSwitcher::keyReleaseEvent(QKeyEvent* event)
+void AppSwitcher::keyReleaseEvent(QKeyEvent* e)
 {
 //    if (event->modifiers() == 0) {
 //        close();
 //        activateWindow(model()->data(model()->index(m_current, 0), AppRole::Window).value<WId>());
 //    }
-    QWidget::keyReleaseEvent(event);
+    QWidget::keyReleaseEvent(e);
 }
 
 void AppSwitcher::timer()
@@ -191,3 +202,11 @@ void AppSwitcher::closeEvent(QCloseEvent*)
 {
     m_timer->stop();
 }
+
+void AppSwitcher::resizeEvent(QResizeEvent *e)
+{
+    QListView::resizeEvent(e);
+
+    Qt::Orientation newOrient = calculateBestOrientation();
+    setOrientation(newOrient);
+}

src/app-switcher.h

@@ -44,11 +44,14 @@ public:
 
     void showSwitcher(bool forward = true);
 
-    void setOrientation(Qt::Orientation orientation);
+    void setOrientation(Qt::Orientation orientation, bool force = false);
+
+    Qt::Orientation calculateBestOrientation();
 
 protected:
-    void keyReleaseEvent(QKeyEvent* event) override;
-    void closeEvent(QCloseEvent*) override;
+    void keyReleaseEvent(QKeyEvent *e) override;
+    void closeEvent(QCloseEvent *e) override;
+    void resizeEvent(QResizeEvent *e) override;
 
 private:
     void selectItem(bool forward = true);
@@ -61,4 +64,5 @@ private:
     QTimer*                    m_timer;
     int                        m_current = 0;
     AppItemDelegate*           m_delegate = nullptr;
+    Qt::Orientation            m_orientation = Qt::Vertical;
 };

src/main.cpp

@@ -58,7 +58,7 @@ int main(int argc, char* argv[])
     Settings::instance().setIconSize(512);
 
     AppSwitcher switcher(nullptr);
-    switcher.setOrientation(Qt::Horizontal);
+    switcher.setOrientation(Qt::Vertical);
     switcher.showSwitcher();
 
     return app.exec();