PyQt/QtQuick/FlatStyle/Flat/Button.qml

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import QtQuick 2.8
import QtQuick.Templates 2.1 as T
import Theme 1.0

T.Button {
    id: control

    font: Theme.font

    implicitWidth: Math.max(background ? background.implicitWidth : 0,
                                         contentItem.implicitWidth + leftPadding + rightPadding)
    implicitHeight: Math.max(background ? background.implicitHeight : 0,
                                          contentItem.implicitHeight + topPadding + bottomPadding)
    leftPadding: 4
    rightPadding: 4

    background: Rectangle {
        id: buttonBackground
        implicitWidth: 100
        implicitHeight: 40
        opacity: enabled ? 1 : 0.3
        border.color: Theme.mainColor
        border.width: 1
        radius: 2

        states: [
            State {
                name: "normal"
                when: !control.down
                PropertyChanges {
                    target: buttonBackground
                }
            },
            State {
                name: "down"
                when: control.down
                PropertyChanges {
                    target: buttonBackground
                    border.color: Theme.mainColorDarker
                }
            }
        ]
    }

    contentItem: Text {
        id: textItem
        text: control.text

        font: control.font
        opacity: enabled ? 1.0 : 0.3
        color: Theme.mainColor
        horizontalAlignment: Text.AlignHCenter
        verticalAlignment: Text.AlignVCenter
        elide: Text.ElideRight

        states: [
            State {
                name: "normal"
                when: !control.down
            },
            State {
                name: "down"
                when: control.down
                PropertyChanges {
                    target: textItem
                    color: Theme.mainColorDarker
                }
            }
        ]
    }
}