Solving Qt Quick Harmattan Graphics Bugs

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Qt Quick Harmattan Graphics Bugs

Using the Qt Quick Application wizard in the current edition of Qt Creator creates Harmattan apps with a few graphical bugs and artifacts:

  1. When loading the application only fills part of the screen while sliding into view
  2. If loading or bringing the application to foreground while the screen is locked or the device is in landscape a dummy toolbar and statusbar get locked in landscape mode
  3. If loading or bringing the application to foreground while the application is in portrait, the left-hand part of the statusbar gets stuck in the corner when you rotate the device to landscape

This is due to a single line in the qmlapplicationviewer code which is created by the Qt Creator wizard, and fortunately it's easy to fix.

Workaround

  1. Open your project, expand the qmlapplicationviewer sub-project, expand sources and then open qmlapplicationviewer.c.
  2. Find the QmlApplicationViewer::showExpanded() function:
void QmlApplicationViewer::showExpanded()
{
#ifdef Q_OS_SYMBIAN
 showFullScreen();
#elif defined(Q_WS_MAEMO_5)
 showMaximized();
#else
 show();
#endif
}
  1. Change it to match the below version:
void QmlApplicationViewer::showExpanded()
{
#if defined(Q_WS_MAEMO_5)
 showMaximized();
#else
 showFullScreen();
#endif
}
  1. Save and rebuild your project

What does this do?

It simply maximises the application before Harmattan begins to slide it into view. The original code would skip past the #ifdef to reach the show(); command, meaning it would open with no size definitions; then Harmattan would slide it into view and then resize it as per the UX guidelines.

Additionally the landscape artifacts seem to be created because the application has not been properly maximised — the above fix also fixes this issue.