Button.qml Example File

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 import QtQuick 2.12
 import QtQuick.Templates 2.12 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
                 }
             }
         ]
     }
 }