IntegratedTestBench/app/QtQuick/Controls/Styles/Base/CircularButtonStyle.qml

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import QtQuick 2.2
import QtQuick.Controls.Styles 1.4
import QtQuick.Extras.Private 1.0

ButtonStyle {
    id: buttonStyle

    label: Text {
        anchors.fill: parent
        horizontalAlignment: Text.AlignHCenter
        verticalAlignment: Text.AlignVCenter
        text: control.text
        font.pixelSize: TextSingleton.font.pixelSize * 1.25
        color: control.pressed || control.checked ? __buttonHelper.textColorDown : __buttonHelper.textColorUp
        styleColor: control.pressed || control.checked ? __buttonHelper.textRaisedColorDown : __buttonHelper.textRaisedColorUp
        style: Text.Raised
        wrapMode: Text.Wrap
        fontSizeMode: Text.Fit
    }

    /*! \internal */
    property alias __buttonHelper: buttonHelper

    CircularButtonStyleHelper {
        id: buttonHelper
        control: buttonStyle.control
    }

    background: Item {
        implicitWidth: __buttonHelper.implicitWidth
        implicitHeight: __buttonHelper.implicitHeight

        Canvas {
            id: backgroundCanvas
            anchors.fill: parent

            Connections {
                target: control
                function onPressedChanged() { backgroundCanvas.requestPaint() }
            }

            onPaint: {
                var ctx = getContext("2d");
                __buttonHelper.paintBackground(ctx);
            }
        }
    }
}