Qt 5.6 | Qt QML | QML Example - Dynamic Scene | dynamicscene.qml Example File

Qt 5.6.3 Reference Documentation

# dynamicscene.qml Example File

dynamicscene/dynamicscene.qml

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

      Item {
          id: window

          property int activeSuns: 0
          property int centerOffset: 72

          height: 480; width: 320

          MouseArea {
              anchors.fill: parent
              onClicked: window.focus = false;
          }

          //This is the message box that pops up when there's an error
          Rectangle {
              id: dialog

              opacity: 0
              anchors.centerIn: parent
              width: dialogText.width + 6; height: dialogText.height + 6
              border.color: 'black'
              color: 'lightsteelblue'
              z: 65535 //Arbitrary number chosen to be above all the items, including the scaled perspective ones.

              function show(str){
                  dialogText.text = str;
                  dialogAnim.start();
              }

              Text {
                  id: dialogText
                  x: 3; y: 3
                  font.pixelSize: 14
              }

              SequentialAnimation {
                  id: dialogAnim
                  NumberAnimation { target: dialog; property:"opacity"; to: 1; duration: 1000 }
                  PauseAnimation { duration: 5000 }
                  NumberAnimation { target: dialog; property:"opacity"; to: 0; duration: 1000 }
              }
          }

          Item {
              id: scene
              anchors { top: sky.top; bottom: ground.bottom; left: parent.left; right: parent.right}
              z: 10
          }

         // sky
          Rectangle {
              id: sky
              anchors { left: parent.left; top: toolbox.bottom; right: parent.right;  bottomMargin: -window.centerOffset; bottom: parent.verticalCenter }
              gradient: Gradient {
                  GradientStop { id: gradientStopA; position: 0.0; color: "#0E1533" }
                  GradientStop { id: gradientStopB; position: 1.0; color: "#437284" }
              }
          }

          // stars (when there's no sun)
          ParticleSystem {
              id: particlesystem
              anchors.fill: sky

              ImageParticle {
                  id: stars
                  source: "content/images/star.png"
                  groups: ["stars"]
                  opacity: .5
              }

              Emitter {
                  id: starsemitter
                  anchors.fill: parent
                  emitRate: parent.width / 50
                  lifeSpan: 5000
                  group: "stars"
              }
          }

          // ground
          Rectangle {
              id: ground
              z: 2    // just above the sun so that the sun can set behind it
              anchors { left: parent.left; top: parent.verticalCenter; topMargin: window.centerOffset; right: parent.right; bottom: parent.bottom }
              gradient: Gradient {
                  GradientStop { position: 0.0; color: "ForestGreen" }
                  GradientStop { position: 1.0; color: "DarkGreen" }
              }
          }

          // top panel
          Rectangle {
              id: toolbox

              height: window.centerOffset * 2
              color: "white"
              anchors { right: parent.right; top: parent.top; left: parent.left}

              Column {
                  anchors.centerIn: parent
                  spacing: 8

                  Text { text: "Drag an item into the scene." }

                  Rectangle {
                      width: palette.width + 10; height: palette.height + 10
                      border.color: "black"

                      Row {
                          id: palette
                          anchors.centerIn: parent
                          spacing: 8

                          PaletteItem {
                              anchors.verticalCenter: parent.verticalCenter
                              componentFile: "Sun.qml"
                              source: "content/images/sun.png"
                              image: "images/sun.png"
                          }
                          PaletteItem {
                              anchors.verticalCenter: parent.verticalCenter
                              componentFile: "GenericSceneItem.qml"
                              source: "content/images/moon.png"
                              image: "images/moon.png"
                          }
                          PaletteItem {
                              anchors.verticalCenter: parent.verticalCenter
                              componentFile: "PerspectiveItem.qml"
                              source: "content/images/tree_s.png"
                              image: "images/tree_s.png"
                          }
                          PaletteItem {
                              anchors.verticalCenter: parent.verticalCenter
                              componentFile: "PerspectiveItem.qml"
                              source: "content/images/rabbit_brown.png"
                              image: "images/rabbit_brown.png"
                          }
                          PaletteItem {
                              anchors.verticalCenter: parent.verticalCenter
                              componentFile: "PerspectiveItem.qml"
                              source: "content/images/rabbit_bw.png"
                              image: "images/rabbit_bw.png"
                          }
                      }
                  }

                  Text { text: "Active Suns: " + window.activeSuns }
              }
          }

          //Popup toolbox down the bottom
          Rectangle {
              id: popupToolbox
              z: 1000
              width: parent.width
              height: popupColumn.height + 16
              color: "white"

              property bool poppedUp: false
              property int downY: window.height - (createButton.height + 16)
              property int upY: window.height - (popupColumn.height + 16)
              y: poppedUp ? upY : downY
              Behavior on y { NumberAnimation {}}

              Column {
                  id: popupColumn
                  y: 8
                  spacing: 8

                  Row {
                      height: createButton.height
                      spacing: 8
                      Text { text: "Custom QML:"; anchors.verticalCenter: parent.verticalCenter }
                      Button {
                          id: popupButton
                          text: popupToolbox.poppedUp ? "Hide" : "Show"
                          onClicked: popupToolbox.poppedUp = !popupToolbox.poppedUp
                      }
                      Button {
                          id: createButton
                          text: "Create"
                          onClicked: {
                              try {
                                  Qt.createQmlObject(qmlText.text, scene, 'CustomObject');
                              } catch(err) {
                                  dialog.show('Error on line ' + err.qmlErrors[0].lineNumber + '\n' + err.qmlErrors[0].message);
                              }
                          }
                      }

                  }

                  Rectangle {
                      width: 360; height: 240

                      TextEdit {
                          id: qmlText
                          anchors.fill: parent; anchors.margins: 5
                          readOnly: false
                          font.pixelSize: 14
                          selectByMouse: true
                          wrapMode: TextEdit.WordWrap

                          text: "import QtQuick 2.0\nImage {\n    id: smile\n    x: 360 * Math.random()\n    y: 40 * Math.random() \n    source: 'content/images/face-smile.png'\n    NumberAnimation on opacity { \n        to: 0; duration: 1500\n    }\n    Component.onCompleted: smile.destroy(1500);\n}"
                      }
                  }
              }
          }

          //Day state, for when a sun is added to the scene
          states: State {
              name: "Day"
              when: window.activeSuns > 0

              PropertyChanges { target: gradientStopA; color: "DeepSkyBlue" }
              PropertyChanges { target: gradientStopB; color: "SkyBlue" }
              PropertyChanges { target: stars; opacity: 0 }
          }

          transitions: Transition {
              PropertyAnimation { duration: 3000 }
              ColorAnimation { duration: 3000 }
          }
      }