Windows 8開發入門（四） Windows 8的常用鼠標事件

在Windows 8中采用一些新的鼠標事件以替代以前Silverlight的鼠標事件，其常用事件如下：

PointerWheelChanged:鼠標中鍵滑動事件。

PointerPressed:鼠標點擊下去的時候即觸發事件 。

PointerReleased:鼠標點擊下去的時候釋放鼠標時觸發事件。

PointerEntered:鼠標進入有 效范圍之時觸發一次。

PointerMoved:鼠標在有效范圍之內移動之時觸發事件。

PointerExited:鼠標退出有效范圍之時觸發事件。

在本文中將通過實例演示各種鼠標事件的響 應.下面我們看實例源碼如下：

<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後台代碼如下，

/// <summary>   
    /// 可用於自身或導航至 Frame 內部的空白頁。   
    /// </summary>   
    public sealed partial class MainPage : Page   
    {   
        public MainPage()   
        {   
            this.InitializeComponent();   
        }   
        Point start = new Point();   
       
        /// <summary>   
        /// 在此頁將要在 Frame 中顯示時進行調用。   
        /// </summary>   
        /// <param name="e">描述如何訪問此頁的事件數據。Parameter   
        /// 屬性通常用於配置頁。</param>   
        protected override void OnNavigatedTo(NavigationEventArgs e)   
        {   
       
        }   
       
        //鼠標中鍵滑動事件   
        private void MainCanvas_PointerWheelChanged(object sender, PointerRoutedEventArgs e)   
        {   
            this.tbLabel.Text = "滑動了一次鼠標中箭";   
        }   
       
        //鼠標點擊下去的事件   
        private void MainCanvas_PointerPressed(object sender, PointerRoutedEventArgs e)   
        {   
            start = e.GetCurrentPoint(MainCanvas).Position;   
            this.tbLabel.Text = "點擊了一次鼠標或者屏幕";   
       
        }   
       
        //鼠標松鍵事件   
        private void MainCanvas_PointerReleased(object sender, PointerRoutedEventArgs e)   
        {   
            Point end = e.GetCurrentPoint(MainCanvas).Position;   
            double angle = 0;   
            //判斷拖動鼠標角度   
            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 = "點擊了一次鼠標或者屏幕";   
            }   
            else if (angle >= 45 && angle < 135)   
            {   
                this.tbLabelFore.Text = "從下往上";   
            }   
            else if (angle <= 45 || angle > 315)   
            {   
                this.tbLabelFore.Text = "從左向右滑";   
            }   
            else if (angle >= 135 && angle < 225)   
            {   
                this.tbLabelFore.Text = "從右向左滑";   
            }   
            else if (angle >= 225 && angle < 315)   
            {   
                this.tbLabelFore.Text = "從上往下";   
            }   
       
        }   
               
        //鼠標移動事件   
        private void MainCanvas_PointerMoved(object sender, PointerRoutedEventArgs e)   
        {   
            Point point = e.GetCurrentPoint(MainCanvas).Position;   
            this.tbLabel.Text = "鼠標正在移動X:"+point.X+",Y:"+point.Y;   
        }   
       
        //鼠標移出范圍事件   
        private void MainCanvas_PointerExited(object sender, PointerRoutedEventArgs e)   
        {   
            this.tbLabelNext.Text = "鼠標移出作用范圍";   
        }   
       
        //鼠標進入范圍事件   
        private void MainCanvas_PointerEntered(object sender, PointerRoutedEventArgs e)   
        {   
            this.tbLabelNext.Text = "鼠標進入范圍";   
        }   
    }

下圖是效果演示,如需源碼請下載：http://files.cnblogs.com/chengxingliang/Win8Event.zip