Qt 5.6 | Qt Quick | Qt Quick Examples - Animation | transitions.qml Example File

Qt 5.6.3 Reference Documentation

# transitions.qml Example File

animation/states/transitions.qml

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** 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 The Qt Company Ltd 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 QtQuick 2.0

      /*
          This is exactly the same as states.qml, except that we have appended
          a set of transitions to apply animations when the item changes
          between each state.
      */

      Rectangle {
          id: page
          width: 640; height: 480
          color: "#343434"

          Image {
              id: userIcon
              x: topLeftRect.x; y: topLeftRect.y
              source: "qt-logo.png"
          }

          Rectangle {
              id: topLeftRect

              anchors { left: parent.left; top: parent.top; leftMargin: 10; topMargin: 20 }
              width: 46; height: 54
              color: "Transparent"; border.color: "Gray"; radius: 6

              // Clicking in here sets the state to the default state, returning the image to
              // its initial position
              MouseArea { anchors.fill: parent; onClicked: page.state = '' }
          }

          Rectangle {
              id: middleRightRect

              anchors { right: parent.right; verticalCenter: parent.verticalCenter; rightMargin: 20 }
              width: 46; height: 54
              color: "Transparent"; border.color: "Gray"; radius: 6

              // Clicking in here sets the state to 'middleRight'
              MouseArea { anchors.fill: parent; onClicked: page.state = 'middleRight' }
          }

          Rectangle {
              id: bottomLeftRect

              anchors { left: parent.left; bottom: parent.bottom; leftMargin: 10; bottomMargin: 20 }
              width: 46; height: 54
              color: "Transparent"; border.color: "Gray"; radius: 6

              // Clicking in here sets the state to 'bottomLeft'
              MouseArea { anchors.fill: parent; onClicked: page.state = 'bottomLeft' }
          }

          states: [
              // In state 'middleRight', move the image to middleRightRect
              State {
                  name: "middleRight"
                  PropertyChanges { target: userIcon; x: middleRightRect.x; y: middleRightRect.y }
              },

              // In state 'bottomLeft', move the image to bottomLeftRect
              State {
                  name: "bottomLeft"
                  PropertyChanges { target: userIcon; x: bottomLeftRect.x; y: bottomLeftRect.y  }
              }
          ]

          // ![0]
          // Transitions define how the properties change when the item moves between each state
          transitions: [

              // When transitioning to 'middleRight' move x,y over a duration of 1 second,
              // with OutBounce easing function.
              Transition {
                  from: "*"; to: "middleRight"
                  NumberAnimation { properties: "x,y"; easing.type: Easing.OutBounce; duration: 1000 }
              },

              // When transitioning to 'bottomLeft' move x,y over a duration of 2 seconds,
              // with InOutQuad easing function.
              Transition {
                  from: "*"; to: "bottomLeft"
                  NumberAnimation { properties: "x,y"; easing.type: Easing.InOutQuad; duration: 2000 }
              },

              // For any other state changes move x,y linearly over duration of 200ms.
              Transition {
                  NumberAnimation { properties: "x,y"; duration: 200 }
              }
          // ![0]
          ]
      }