/**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the examples of the Qt Mobility Components. ** ** $QT_BEGIN_LICENSE:BSD$ ** You may use this file under the terms of the BSD license as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor ** the names of its contributors may be used to endorse or promote ** products derived from this software without specific prior written ** permission. ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** $QT_END_LICENSE$ ** ****************************************************************************/ import Qt 4.7 import QtMultimediaKit 1.1 Item { id : zoomControl property real currentZoom : 1 property real maximumZoom : 1 signal zoomTo(real value) MouseArea { id : mouseArea anchors.fill: parent property real initialZoom : 0 property real initialPos : 0 onPressed: { initialPos = mouseY initialZoom = zoomControl.currentZoom } onMousePositionChanged: { if (pressed) { var target = initialZoom * Math.pow(2, (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 opacity : 0 Rectangle { anchors.fill: parent smooth: true radius: 8 border.color: "black" border.width: 2 color: "white" opacity: 0.3 } Rectangle { 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: "black" opacity: 0.5 } states: State { name: "ShowBar" when: mouseArea.pressed || zoomControl.currentZoom > 1.0 PropertyChanges { target: bar; opacity: 1 } } transitions: [ Transition { to : "ShowBar" NumberAnimation { properties: "opacity"; duration: 100 } }, Transition { from : "ShowBar" NumberAnimation { properties: "opacity"; duration: 500 } } ] } }