Archived:Dynamic Layout handling with QWidget

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15 Sep
2009

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Qt Quick should be used for all UI development on mobile devices. The approach described in this article (based on QWidget) is deprecated.

Article Metadata

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Code Example

Source file: Media:QtEggAlarm.zip

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Tested with

Devices(s): S60 Emulator

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Compatibility

Platform(s): S60 3rd Edition FP1, S60 3rd Edition FP2, S60 5th Edition

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Article

Created: symbianyucca (10 Apr 2009)

Last edited: hamishwillee (11 Oct 2012)

Dynamic Layout handling with QWidget

To be able to catch the layout change event, you first need to install event filter, which will give you then the events when layout changes happen. This can be done for example in the main.cpp, in where you can use installEventFilter function of the QApplication to install a filter, for example like this:

QApplication a(argc, argv);
QtEggAlarm w;
a.installEventFilter(&w);

The event filter class then needs to implement eventFilter function which will then be called when events happen. For layout changes a QEvent::Resize event will be generated, thus you could catch the event in the event filter as follows:

bool QtEggAlarm::eventFilter(QObject* /*receiver*/, QEvent* event)
{
	if(event->type() == QEvent::Resize)
	{
		SetScreenSizeAndPosition();	
		return true;
	}
 
 
	 return false;
}

Note that if the return value is false, then the event will be given to other filters, and if it is true, it will not be forwarded to other components.

Then If you want to Widget to fill the whole client area in S60 device, the SetScreenSizeAndPosition function could be implemented as follows:

void QtEggAlarm::SetScreenSizeAndPosition(void)
{
	setGeometry(QApplication::desktop()->availableGeometry());
}

Screen shots

Example project

File:QtEggAlarm.zip