SL 4的鼠標右鍵事件功能：
鼠標右鍵事件我個人覺得比較使用的功能是更換頁面皮膚，或者是彈出子窗口來添加臨時需要填寫的數據，或者是選擇工具，或者是轉到不同的連接等等。看項目需要你可以稍微想想，這個功能可以就是一個亮點。
在Silverlight 4中有個MouseRightButtonDown和MouseRightButtonUp事件，你可以給把它們合起來使用完成很多功能。當然，有LeftButton也有同樣也添加了Up和Down事件。
我在Silverlight官網看了段視頻介紹這個功能，它主要是介紹了右鍵修改皮膚，和ChildWindow彈出。我這裏會邊寫邊想着個大家多舉幾個例子。
1. 創建一個SilverLight4的應用程序。
2. 然後是在頁面隨便加點東西，我加了一個Rectangle，如下圖
Ok，先測試下右鍵鼠標Down事件，
frame.MouseRightButtonDown+=new MouseButtonEventHandler(frame_MouseRightButtonDown);
委託的方法是MouseRightButtonDown，它的代碼這裏就寫個MessageBox彈出，
void frame_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
MessageBox.Show("button right clicked on the frame");
}
運行一下，：
3. 更換這個Rectangle的顏色，也就是皮膚吧：
使用Popup控件來作爲右鍵時皮膚項的容器。Popup中添加一個Grid。最後出來的結構如下：
ListView中存放的是菜單，每個顏色都會添加一個右鍵的down事件，當事件發生時修改皮膚顏色。Grid也沒什麼特殊作用就是個容器，ListView相同。比較特殊的是Canvas這個控件，它添加了兩個事件：鼠標右鍵Down和鼠標左鍵Down，任何一個發生時，它都會去查看當的Popup是否打開，如果是打開就給關閉。
代碼如下:
_popup = new Popup();
_grid = new Grid();
_popup.Child = _grid;
_canvas = new Canvas();
_canvas.MouseLeftButtonDown += (sender, args) => { OnClickOutside(); };
_canvas.MouseRightButtonDown += (sender, args) => { args.Handled = true; OnClickOutside(); };
_canvas.Background = new SolidColorBrush(Colors.Transparent);
_grid.Children.Add(_canvas);
_content = GetContent();
_content.HorizontalAlignment = HorizontalAlignment.Left;
_content.VerticalAlignment = VerticalAlignment.Top;
_content.Margin = new Thickness(_location.X, _location.Y, 0, 0);
_grid.Children.Add(_content);
UpdateSize();
這裏你發現沒有ListBox，而只能看到一個_content,它是個自定義的控件：
Grid grid = new Grid() { Width = 100, Height = 115 };
Border border = new Border() { BorderBrush = new SolidColorBrush(Colors.Black), BorderThickness = new Thickness(1), Background = new SolidColorBrush(Colors.LightGray) };
grid.Children.Add(border);
TextBlock red = new TextBlock() { Text = "Red", Width = 90 };
red.MouseLeftButtonUp += new MouseButtonEventHandler(ChangeColorRed);
TextBlock blue = new TextBlock() { Text = "Blue", Width = 90 };
blue.MouseLeftButtonUp += new MouseButtonEventHandler(ChangeColorBlue);
TextBlock green = new TextBlock() { Text = "Green", Width = 90 };
green.MouseLeftButtonUp += new MouseButtonEventHandler(ChangeColorGreen);
TextBlock yellow = new TextBlock() { Text = "Yellow", Width = 90 };
yellow.MouseLeftButtonUp += new MouseButtonEventHandler(ChangeColorYellow);
TextBlock cancel = new TextBlock() { Text = "Cancel Menu", Width = 90 };
cancel.MouseLeftButtonUp += new MouseButtonEventHandler(CancelContextMenu);
ListBox options = new ListBox();
options.Items.Add(red);
options.Items.Add(blue);
options.Items.Add(green);
options.Items.Add(yellow);
options.Items.Add(cancel);
grid.Children.Add(options);
就是在它裏面添加了ListBox 。
最後就是在頁面加載時給需要改變顏色的控件添加右鍵事件：
frame.MouseRightButtonDown+=new MouseButtonEventHandler(frame_MouseRightButtonDown);
frame.MouseRightButtonUp+= new MouseButtonEventHandler(frame_MouseRightButtonUp);
void frame_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
e.Handled = true;
}
void frame_MouseRightButtonUp(object sender,MouseButtonEventArgs e)
{
SkinChangeContextMenu contextMenu = new SkinChangeContextMenu(frame);
contextMenu.Show(e.GetPosition(LayoutRoot));
}
運行結果：
4. 使用MouseRightDown事件來改變一個Canvas的大小；
還是以上面的Canvas爲例子，鼠標右鍵是我們需要讓一個Popup顯示出來，通過Popup上的兩個Slider來設置Canvas的Height和Width。
Xaml代碼：
<Grid x:Name="LayoutRoot" Background="White">
<TextBlock Text="Right-click to customize" FontWeight="Bold" Margin="12,0,0,0"/>
<Rectangle Height="254" HorizontalAlignment="Left" Margin="12,24,0,0" Name="frame"
Stroke="Black" StrokeThickness="4" VerticalAlignment="Top" Width="320" RadiusX="15" RadiusY="15"Fill="Red"
MouseRightButtonDown="frame_MouseRightButtonDown"
MouseRightButtonUp="frame_MouseRightButtonUp" />
<Popup x:Name="pop">
<Border Background="LightBlue" Margin="10" BorderBrush="Blue" CornerRadius="5"BorderThickness="3">
<Grid Width="235" Height="138">
<TextBlock Text="Customize:" FontWeight="Bold" HorizontalAlignment="Center"Margin="83,0,83,116" />
<TextBlock Height="23" HorizontalAlignment="Left" Margin="19,30,0,0"Name="textBlock1" Text="Width:" VerticalAlignment="Top" Width="60" />
<Slider Height="23" Name="slWidth" Margin="114,31,31,84" Value="320"Minimum="10" Maximum="320" ValueChanged="slWidth_ValueChanged" />
<TextBlock Height="23" HorizontalAlignment="Left" Margin="19,72,0,0"Name="Height" Text="Height:" VerticalAlignment="Top" Width="60" />
<Slider Height="23" Margin="114,72,31,43" Name="slheight" Minimum="10"Value="254" Maximum="254" ValueChanged="slheight_ValueChanged" />
<Button Content="Done" Height="23" HorizontalAlignment="Left"Margin="129,109,0,0" Name="btnDone" Click="btnDone_Click" VerticalAlignment="Top" Width="75" />
</Grid>
</Border>
</Popup>
當在Canvas右鍵點擊時，我們讓這個Popup彈出來：
private void frame_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
e.Handled = true;
}
private void frame_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
{
pop.HorizontalOffset = e.GetPosition(null).X + 2;
pop.VerticalOffset = e.GetPosition(null).Y + 2;
pop.IsOpen = true;
}
Popup傷的Slider添加的事件代碼：
private void slheight_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
if (frame == null) return;
frame.Height = slheight.Value;
}
private void slWidth_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
if (frame == null) return;
frame.Width = slWidth.Value;
}
private void btnDone_Click(object sender, RoutedEventArgs e)
{
pop.IsOpen = false;
}
現在運行下，看看結果：
拖動滾動條就可以讓後面紅色的那個Rectangle高度或者寬度變化。
5. 剛纔試着給那個popup添加哥drag –drop功能，沒成功。