Add screen utilities for screen and center widget on screen

src/transcoder/transcodedialog.cpp

@@ -27,7 +27,6 @@
 #include <QWidget>
 #include <QDialog>
 #include <QScreen>
-#include <QWindow>
 #include <QMainWindow>
 #include <QAbstractItemModel>
 #include <QtAlgorithms>
@@ -58,6 +57,7 @@
 
 #include "core/iconloader.h"
 #include "core/mainwindow.h"
+#include "utilities/screenutils.h"
 #include "widgets/fileview.h"
 #include "transcodedialog.h"
 #include "transcoder.h"
@@ -194,17 +194,7 @@ void TranscodeDialog::LoadGeometry() {
   s.endGroup();
 
   // Center the window on the same screen as the mainwindow.
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
-  QScreen *screen = mainwindow_->screen();
-#else
-  QScreen *screen = (mainwindow_->window() && mainwindow_->window()->windowHandle() ? mainwindow_->window()->windowHandle()->screen() : nullptr);
-#endif
-  if (screen) {
-    const QRect sr = screen->availableGeometry();
-    const QRect wr({}, size().boundedTo(sr.size()));
-    resize(wr.size());
-    move(sr.center() - wr.center());
-  }
+  Utilities::CenterWidgetOnScreen(Utilities::GetScreen(mainwindow_), this);
 
 }