在Windows 8中采用一些新的鼠标事件以替代以前Silverlight的鼠标事件，其常用事件如下：
PointerWheelChanged:鼠标中键滑动事件。
PointerPressed:鼠标点击下去的时候即触发事件。
PointerReleased:鼠标点击下去的时候释放鼠标时触发事件。
PointerEntered:鼠标进入有效范围之时触发一次。
PointerMoved:鼠标在有效范围之内移动之时触发事件。
PointerExited:鼠标退出有效范围之时触发事件。
在本文中将通过实例演示各种鼠标事件的响应.下面我们看实例源码如下：
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}"> <Canvas Name="MainCanvas" Width="600" Height="300" Background="Cornsilk" PointerWheelChanged="MainCanvas_PointerWheelChanged" PointerReleased="MainCanvas_PointerReleased" PointerPressed="MainCanvas_PointerPressed" PointerMoved="MainCanvas_PointerMoved" PointerExited="MainCanvas_PointerExited" PointerEntered="MainCanvas_PointerEntered" ></Canvas> <TextBlock HorizontalAlignment="Left" Foreground="Gold" Margin="383,99,0,0" TextWrapping="Wrap" Name="tbLabel" Text="" VerticalAlignment="Top" Height="40" Width="418"/> <TextBlock HorizontalAlignment="Left" Foreground="Gold" Margin="774,99,0,0" TextWrapping="Wrap" Name="tbLabelNext" Text="" VerticalAlignment="Top" Height="40" Width="209"/> <TextBlock HorizontalAlignment="Left" Foreground="Gold" Margin="564,171,0,0" TextWrapping="Wrap" Name="tbLabelFore" Text="" VerticalAlignment="Top" Height="40" Width="209"/> </Grid>
其中Xaml.cs后台代码如下，
/// <summary> /// 可用于自身或导航至 Frame 内部的空白页。 /// </summary> public sealed partial class MainPage : Page { public MainPage() { this.InitializeComponent(); } Point start = new Point(); /// <summary> /// 在此页将要在 Frame 中显示时进行调用。 /// </summary> /// <param name="e">描述如何访问此页的事件数据。Parameter /// 属性通常用于配置页。</param> protected override void OnNavigatedTo(NavigationEventArgs e) { } //鼠标中键滑动事件 private void MainCanvas_PointerWheelChanged(object sender, PointerRoutedEventArgs e) { this.tbLabel.Text = "滑动了一次鼠标中箭"; } //鼠标点击下去的事件 private void MainCanvas_PointerPressed(object sender, PointerRoutedEventArgs e) { start = e.GetCurrentPoint(MainCanvas).Position; this.tbLabel.Text = "点击了一次鼠标或者屏幕"; } //鼠标松键事件 private void MainCanvas_PointerReleased(object sender, PointerRoutedEventArgs e) { Point end = e.GetCurrentPoint(MainCanvas).Position; double angle = 0; //判断拖动鼠标角度 if (Math.Abs(end.X - start.X) < 1 && Math.Abs(end.Y - start.Y) < 1) { angle = 0; } else if (end.X > start.X) { if (end.Y > start.Y) { angle = 360 - Math.Atan((end.Y - start.Y) * 1.0 / (end.X - start.X)) * 180 / Math.PI; } else { angle = Math.Atan((start.Y - end.Y) * 1.0 / (end.X - start.X)) * 180 / Math.PI; } } else if (end.X < start.X) { if (end.Y > start.Y) { angle = Math.Atan((end.Y - start.Y) * 1.0 / (start.X - end.X)) * 180 / Math.PI + 180; } else { angle = 180 - Math.Atan((start.Y - end.Y) * 1.0 / (start.X - end.X)) * 180 / Math.PI; } } if (angle == 0) { this.tbLabel.Text = "点击了一次鼠标或者屏幕"; } else if (angle >= 45 && angle < 135) { this.tbLabelFore.Text = "从下往上"; } else if (angle <= 45 || angle > 315) { this.tbLabelFore.Text = "从左向右滑"; } else if (angle >= 135 && angle < 225) { this.tbLabelFore.Text = "从右向左滑"; } else if (angle >= 225 && angle < 315) { this.tbLabelFore.Text = "从上往下"; } } //鼠标移动事件 private void MainCanvas_PointerMoved(object sender, PointerRoutedEventArgs e) { Point point = e.GetCurrentPoint(MainCanvas).Position; this.tbLabel.Text = "鼠标正在移动X:"+point.X+",Y:"+point.Y; } //鼠标移出范围事件 private void MainCanvas_PointerExited(object sender, PointerRoutedEventArgs e) { this.tbLabelNext.Text = "鼠标移出作用范围"; } //鼠标进入范围事件 private void MainCanvas_PointerEntered(object sender, PointerRoutedEventArgs e) { this.tbLabelNext.Text = "鼠标进入范围"; } }
下图是效果演示,如需源码请点击 Win8Event.zip 下载.
本文转自程兴亮 51CTO博客，原文链接:http://blog.51cto.com/chengxingliang/1059512