QML::Rectangle组件

QML的Rectangle组件，描绘一个矩形，一个可视化的对象。

外加设置属性来达到我们想要的效果。常用的有矩形的颜色，边框颜色，圆角等设置。

 Rectangle{
           x:10//这里的坐标是相对于它的父窗口，也就是Window
           y:10
            100;
           height: 100;//一定要指定出大小才能显示
           visible: true
           antialiasing: true;//抗锯齿，默认就是开启的
           border. 10;
           border.color: "red";//边框的一些属性
           color: "blue"//内部的颜色
           radius: 5//圆角半径
           gradient: Gradient{//颜色渐变
               GradientStop { position: 0.0; color: "lightsteelblue" }
               GradientStop { position: 1.0; color: "blue" }
           }
           clip:true//这一属性设置表示如果他的子类超出了范围，那么就剪切掉，不让他显示和起作用
           Rectangle{
               id:son
               x:50;  //基于父窗口的位置
               y:50;
                300;
               height: 100;
               color: "gray";
           }
    }

 Rectangle {
        color: "blue"
         100; height: 100
        Rectangle {
            color: "green"
             25; height: 25
        }
        Rectangle {
            color: "red"
            x: 25; y: 25;  25; height: 25
            scale: 1.5  //放大1.5倍
            transformOrigin: "TopLeft" //改变元素的原点位置
        }
    }

  Row {
          Rectangle {
               100; height: 100
              color: "blue"
              transform: Translate { y: 40 }//下移
          }
          Rectangle {
               100; height: 100
              color: "red"
              transform: Translate { y: -40 }//上移
          }
      }

   Rectangle {
         100; height: 100
        color: "red"
        PropertyAnimation on x { to: 50; duration: 1000; loops: Animation.Infinite } //从（0，0）坐标移动到（50。50），
        PropertyAnimation on y { to: 50; duration: 1000; loops: Animation.Infinite }//1000表示一秒时间， duration 越大移动越慢
    }
    
    Rectangle {
         100; height: 100
        color: "red"
        PropertyAnimation on x { to: 50; duration: 1000; easing.type: Easing.OutBounce }
        PropertyAnimation on y { to: 50; duration: 1000; easing.type: Easing.OutBounce }//移动到50，50 ，OutBounce 动画效果
    }
    
    Rectangle {
         100; height: 100; anchors.centerIn: parent
        color: "red"
        RotationAnimation on rotation { to: 90; direction: RotationAnimation.Clockwise } //旋转90°
    }
    
    Rectangle {
        100; height: 100
       ColorAnimation on color { from: "red"; to: "yellow"; duration: 1000 } //在1s时间内 颜色变化
   }

  // Rectangle 跟随鼠标移动 写法一
    Item {
         100; height: 100

        Rectangle {
            id: rect
             100; height: 100
            color: "red"

            Behavior on x { PropertyAnimation { duration: 500 } }
            Behavior on y { PropertyAnimation { duration: 500 } }
        }

        MouseArea {
            anchors.fill: parent
            onClicked: { rect.x = mouse.x; rect.y = mouse.y }
        }
    }

    // Rectangle 跟随鼠标移动 写法二
    Rectangle {
           id: rect
            100; height: 100
           color: "red"

           PropertyAnimation {
               id: animation
               target: rect
               properties: "x,y"
               duration: 1000
           }

           MouseArea {
               anchors.fill: parent
               onClicked: {
                   animation.to = 50;
                   animation.running = true;
               }
           }
       }
    // Rectangle 跟随鼠标移动 写法三
    Rectangle {
           id: rect
            100; height: 100
           color: "red"

           MouseArea {
               anchors.fill: parent
               onClicked: rect.state = "moved"
           }

           states: State {
               name: "moved"
               PropertyChanges { target: rect; x: 50; y: 50 }
           }

           transitions: Transition {
               PropertyAnimation { properties: "x,y"; duration: 1000 }
           }
       }

 // 自由落体动画效果
    Rectangle {
        id: rect
         120; height: 200

        Image {
            id: img
            source: "colors.png"
            anchors.horizontalCenter: parent.horizontalCenter
            y: 0

            SequentialAnimation on y {
                loops: Animation.Infinite
                NumberAnimation { to: rect.height - img.height;
                    easing.type: Easing.OutBounce; duration: 2000 }
                PauseAnimation { duration: 1000 }
                NumberAnimation { to: 0; easing.type: Easing.OutQuad;
                    duration: 1000 }
            }
        }
    }