Qt 5.6 | Qt Quick | Qt Quick Examples - Animation | property-animation.qml Example File

Qt 5.6.3 Reference Documentation

# property-animation.qml Example File

animation/basics/property-animation.qml

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      import QtQuick 2.0

      Item {
          id: window
          width: 320; height: 480

          // Let's draw the sky...
          Rectangle {
              anchors { left: parent.left; top: parent.top; right: parent.right; bottom: parent.verticalCenter }
              gradient: Gradient {
                  GradientStop { position: 0.0; color: "#14148c" }
                  GradientStop { position: 1.0; color: "#14aaff" }
              }
          }

          // ...and the ground.
          Rectangle {
              anchors { left: parent.left; top: parent.verticalCenter; right: parent.right; bottom: parent.bottom }
              gradient: Gradient {
                  GradientStop { position: 0.0; color: "#80c342" }
                  GradientStop { position: 1.0; color: "#006325" }
              }
          }

          // The shadow for the smiley face
          Image {
              anchors.horizontalCenter: parent.horizontalCenter
              y: smiley.minHeight + 58
              source: "images/shadow.png"

              // The scale property depends on the y position of the smiley face.
              scale: smiley.y * 0.5 / (smiley.minHeight - smiley.maxHeight)
          }

          Image {
              id: smiley
              property int maxHeight: window.height / 3
              property int minHeight: 2 * window.height / 3

              anchors.horizontalCenter: parent.horizontalCenter
              y: minHeight
              source: "images/face-smile.png"

              // Animate the y property. Setting loops to Animation.Infinite makes the
              // animation repeat indefinitely, otherwise it would only run once.
              SequentialAnimation on y {
                  loops: Animation.Infinite

                  // Move from minHeight to maxHeight in 300ms, using the OutExpo easing function
                  NumberAnimation {
                      from: smiley.minHeight; to: smiley.maxHeight
                      easing.type: Easing.OutExpo; duration: 300
                  }

                  // Then move back to minHeight in 1 second, using the OutBounce easing function
                  NumberAnimation {
                      from: smiley.maxHeight; to: smiley.minHeight
                      easing.type: Easing.OutBounce; duration: 1000
                  }

                  // Then pause for 500ms
                  PauseAnimation { duration: 500 }
              }
          }
      }