ZoomControl.qml Example File

multimedia/declarative-camera/ZoomControl.qml
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import QtQuick 2.0 import QtMultimedia 5.0 Item { id : zoomControl property real currentZoom : 1 property real maximumZoom : 1 signal zoomTo(real value) visible: zoomControl.maximumZoom > 1 MouseArea { id : mouseArea anchors.fill: parent property real initialZoom : 0 property real initialPos : 0 onPressed: { initialPos = mouseY initialZoom = zoomControl.currentZoom } onPositionChanged: { if (pressed) { var target = initialZoom * Math.pow(5, (initialPos-mouseY)/zoomControl.height); target = Math.max(1, Math.min(target, zoomControl.maximumZoom)) zoomControl.zoomTo(target) } } } Item { id : bar x : 16 y : parent.height/4 width : 24 height : parent.height/2 Rectangle { anchors.fill: parent smooth: true radius: 8 border.color: "white" border.width: 2 color: "black" opacity: 0.3 } Rectangle { id: groove x : 0 y : parent.height * (1.0 - (zoomControl.currentZoom-1.0) / (zoomControl.maximumZoom-1.0)) width: parent.width height: parent.height - y smooth: true radius: 8 color: "white" opacity: 0.5 } Text { id: zoomText anchors { left: bar.right; leftMargin: 16 } y: Math.min(parent.height - height, Math.max(0, groove.y - height / 2)) text: "x" + Math.round(zoomControl.currentZoom * 100) / 100 font.bold: true color: "white" style: Text.Raised; styleColor: "black" opacity: 0.85 font.pixelSize: 18 } } }