On 24 Jun 2014, at 09:36, Nancy Zou <nancy....@csr.com> wrote:

> Dear All
> My display resolution is 800*480,

Sounds like you are on Android or on some sort of embedded system?  So probably 
the reason is that you cannot have multiple windows: the whole application must 
be full-screen by design.  Of course you can have a red rectangle inside a 
black one if that’s what you want.

> I write a qml like that:
>  
> import QtQuick 2.0
> Rectangle {
> width:300
> height: 200
> color: "red"
> }
> Why it show the whole screen red color.
> I think it may be caused by window size.  Is it right?
> How does qquick scene graph display qml contents to screen?
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