Qt Reference Documentation

# tvtennis.qml Example File

declarative/toys/tvtennis/qml/tvtennis/tvtennis.qml

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     import QtQuick 1.0

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

         // Make a ball to bounce
         Rectangle {
             id: ball

             // Add a property for the target y coordinate
             property variant direction : "right"

             x: 20; width: 20; height: 20; z: 1
             color: "Lime"

             // Move the ball to the right and back to the left repeatedly
             SequentialAnimation on x {
                 loops: Animation.Infinite
                 NumberAnimation { to: page.width - 40; duration: 2000 }
                 PropertyAction { target: ball; property: "direction"; value: "left" }
                 NumberAnimation { to: 20; duration: 2000 }
                 PropertyAction { target: ball; property: "direction"; value: "right" }
             }

             // Make y move with a velocity of 200
             Behavior on y { SpringAnimation{ velocity: 200; }
             }

             Component.onCompleted: y = page.height-10; // start the ball motion

             // Detect the ball hitting the top or bottom of the view and bounce it
             onYChanged: {
                 if (y <= 0) {
                     y = page.height - 20;
                 } else if (y >= page.height - 20) {
                     y = 0;
                 }
             }
         }

         // Place bats to the left and right of the view, following the y
         // coordinates of the ball.
         Rectangle {
             id: leftBat
             color: "Lime"
             x: 2; width: 20; height: 90
             y: ball.direction == 'left' ? ball.y - 45 : page.height/2 -45;
             Behavior on y { SpringAnimation{ velocity: 300 } }
         }
         Rectangle {
             id: rightBat
             color: "Lime"
             x: page.width - 22; width: 20; height: 90
             y: ball.direction == 'right' ? ball.y - 45 : page.height/2 -45;
             Behavior on y { SpringAnimation{ velocity: 300 } }
         }

         // The rest, to make it look realistic, if neither ever scores...
         Rectangle { color: "Lime"; x: page.width/2-80; y: 0; width: 40; height: 60 }
         Rectangle { color: "Black"; x: page.width/2-70; y: 10; width: 20; height: 40 }
         Rectangle { color: "Lime"; x: page.width/2+40; y: 0; width: 40; height: 60 }
         Rectangle { color: "Black"; x: page.width/2+50; y: 10; width: 20; height: 40 }
         Repeater {
             model: page.height / 20
             Rectangle { color: "Lime"; x: page.width/2-5; y: index * 20; width: 10; height: 10 }
         }
     }