Height/Width of Qt Quick Controls

[Mathan]

Hi,

I am developing an app using Qt5.7/Qt Quick controls.

I want to setup height/width for the QtQuicks controls like Textfiled/Button/Rectangle using QML.
I want to setup the height/width of the controls which adjust according to screen size/orientation of the target devices.
Now, I am providing the Pixel value which turn out a mess when the same app deployed in Tablets/smartphones.