BlackButtonStyle.qml Example File

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 import QtQuick 2.2
 import QtQuick.Controls 1.1
 import QtQuick.Controls.Styles 1.1

 ButtonStyle {
     property color fontColor

     property url rightAlignedIconSource

     background: BlackButtonBackground {
         pressed: control.pressed
     }
     label: Item {
         implicitWidth: row.implicitWidth
         implicitHeight: row.implicitHeight
         baselineOffset: row.y + text.y + text.baselineOffset

         Row {
             id: row
             anchors.left: control.text.length === 0 ? undefined : parent.left
             anchors.leftMargin: control.text.length === 0 ? 0 : textSingleton.implicitHeight
             anchors.verticalCenter: parent.verticalCenter
             anchors.horizontalCenter: control.text.length === 0 ? parent.horizontalCenter : undefined

             Image {
                 source: control.iconSource
                 width: Math.min(sourceSize.width, height)
                 height: text.implicitHeight
                 fillMode: Image.PreserveAspectFit
             }
             Text {
                 id: text
                 text: control.text
                 color: fontColor
                 font.pixelSize: control.height * 0.25
                 font.family: openSans.name
                 horizontalAlignment: Text.AlignLeft
                 verticalAlignment: Text.AlignVCenter
                 anchors.verticalCenter: parent.verticalCenter
             }
         }

         Loader {
             active: rightAlignedIconSource.toString().length !== 0
             anchors.verticalCenter: parent.verticalCenter
             anchors.right: parent.right
             anchors.rightMargin: textSingleton.implicitHeight

             sourceComponent: Image {
                 width: Math.min(sourceSize.width, height)
                 height: text.implicitHeight
                 fillMode: Image.PreserveAspectFit
                 source: rightAlignedIconSource
             }
         }
     }
 }