windows phone (21) Grid元素的Background和Clip

 

Grid是唯一可以在内部定制单元格的panel类，我们可以在grid中定制单元格，然后通过grid.row和grid.column定位grid包含的元素在哪个位置，功能比较强大，用到的时候比较多，且看他的属性：【作者：神舟龙】

 

Background

 

获取或设置一个用于填充面板的 Brush所以我们可以对其背景进行绘制 ，比如下面的案例：

 

 

 <!--ContentPanel - 在此处放置其他内容-->
        <Grid x:Name= " ContentPanel " Grid.Row= " 1 " Margin= " 12,0,12,0 "
             
              >
            <Grid.Background>
                <RadialGradientBrush>
                    <GradientStop Offset= " 0.9 " Color= " DarkBlue "></GradientStop>
                    <GradientStop Offset= " 0.8 " Color= " Firebrick "></GradientStop>
                </RadialGradientBrush>
            </Grid.Background>
        </Grid>

 

 

 它的显示效果：

 

 Clip

 

 

获取或设置用于定义Grid的内容边框的 Geometry，下面的效果是实现的类似于天狗吃月最后一刻的效果

xaml代码：

 

 

 <!--ContentPanel - 在此处放置其他内容-->
        <Grid x:Name= " ContentPanel " Grid.Row= " 1 " Margin= " 12,0,12,0 "
              >
            <Grid.Background>
                <RadialGradientBrush>
                    <GradientStop Offset= " 0.9 " Color= " White "></GradientStop>
                    <GradientStop Offset= " 0.8 " Color= " Black "></GradientStop>
                </RadialGradientBrush>
            </Grid.Background>
            <Grid.Clip>
                <EllipseGeometry Center= " 240 250 " RadiusX= " 180 " RadiusY= " 190 "></EllipseGeometry>
            </Grid.Clip>
        </Grid>

 

 

 效果：

 

 话说这样的效果还不错，只不过他不能通过修改参数实现天狗吃月的全过程，上面出现的效果是无意中做出了的；

Geometry 类

为用于定义几何形状的对象提供基类，所以EllipseGeometry,GeometryGroup等所继承它的类都可以，比如我们使用RectangelGeoMetry获取矩形剪辑区域

 

xaml代码：

 <!--ContentPanel - 在此处放置其他内容-->
        <Grid x:Name= " ContentPanel " Grid.Row= " 1 " Margin= " 12,0,12,0 "
              >
            <Grid.Background>
                <RadialGradientBrush>
                    <GradientStop Offset= " 0.1 " Color= " Purple "></GradientStop>
                    <GradientStop Offset= " 0.2 " Color= " Blue "></GradientStop>
                </RadialGradientBrush>
            </Grid.Background>
            <Grid.Clip>
                <RectangleGeometry >
                    <RectangleGeometry.Rect>
                        <Rect X= " 20 " Y= " 30 " Width= " 300 " Height= " 400 "></Rect>
                    </RectangleGeometry.Rect>
                </RectangleGeometry>
            </Grid.Clip>
        </Grid>

 效果：

 

 

我们可以从隐藏文件添加一些其他的元素：

 

  //  构造函数
         public MainPage()
        {
            InitializeComponent();
            LayoutDesign();
        }
         private  void LayoutDesign()
        {

            TextBlock DeptListHeading =  new TextBlock();
            DeptListHeading.Text =  " Department ";

            ListBox DeptList =  new ListBox();
            DeptList.Items.Add( " Finance ");
            DeptList.Items.Add( " Marketing ");
            DeptList.Items.Add( " Human Resources ");
            DeptList.Items.Add( " Payroll ");
            DeptList.Items.Add(DeptListHeading);
            
               this.ContentPanel.Children.Add(DeptList);

           
        }

 

 效果：

 

 这篇比较基础