It's focus event,not hover!

In some embedded device,there is no need to use standard PC keyboard and mouse.

In general,we connect a physical key pad,such as 8x8 matrix keypad.In this situation,we'd like to control the focus

move through the GUI's elements.

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Beijing                  YanTai                    QingDao

Shanghai             GuangDong            ShenZhen

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Here,the main interface has six buttons,we want to move cursor from top to bottom and from left to right,this action can choose the current item,then we press the 'Okay' key to enter next screen.

In such situation,we should to make the current item is highlight than others.In Qt,we use focusIn and focusOut event.

The button changes its background color when it has focusIn  and changes back when it lost the focus.

Following pictures are shown this purpose,captured from web pages.

Enjoy them,guys!

By zhangshaoyan at May 20,2015.