qt - How to make image to fill qml controls button -

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i want icon fill button. here code:

import qtquick 2.3 import qtquick.controls 1.2 import qtquick.layouts 1.1 import qtquick.window 2.2  window{     id: root     title: "settings"     flags: qt.dialog     minimumheight: 700     minimumwidth: 700     maximumheight: 700     maximumwidth: 700      columnlayout{         id: columnlayout         anchors.fill: parent         rowlayout{             button{                 iconsource: "images/1x1.png"                 checkable: true                 checked: true                 layout.minimumwidth: 100                 layout.minimumheight: 100                 }              button{                 iconsource: "images/1x2.png"                 checkable: true                 checked: false                 layout.minimumwidth: 100                 layout.minimumheight: 100             }             button{                 iconsource: "images/2x1.png"                 checkable: true                 checked: false                 layout.minimumwidth: 100                 layout.minimumheight: 100             }             button{                 iconsource: "images/2x2.png"                 checkable: true                 checked: false                 layout.minimumwidth: 100                 layout.minimumheight: 100             }         }         rectangle{             visible: true             implicitheight: 600             implicitwidth: 700             color: "red"         }     } }

button size 100*100 pixels image size lower. how make image big button

if don't mind using private api, there's padding property:

import qtquick 2.4 import qtquick.controls 1.2 import qtquick.controls.styles 1.2  item {     width: 200     height: 200      button {         iconsource: "http://www.sfweekly.com/imager/the-exhikittenist-cattown-cat-pics-and-m/b/square/3069319/58c8/wikicat.jpg"         anchors.centerin: parent         style: buttonstyle {             padding {                 left: 0                 right: 0                 top: 0                 bottom: 0             }         }          rectangle {             anchors.fill: parent             color: "black"             opacity: parent.pressed ? 0.5 : 0         }     } }

looking @ buttonstyle.qml:

/*! padding between background , label components. */ padding {     top: 4     left: 4     right:  control.menu !== null ? math.round(textsingleton.implicitheight * 0.5) : 4     bottom: 4 }

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