鼠标右键菜单咋sivlerlight 4版本以前是没法实现，在silverlight 4上微软提供了鼠标右键的响应事件，所以实现起来比较方便。鼠标右键菜单弹出的实现无非就是在该弹出菜单的地方点击右键，捕获右键消息，弹出菜单。响应和捕获右键菜单只需要在相应控件处为控件注册MouseRightButtonDown、MouseRightButtonUp事件。并且在相应事件的响应函数写入如下信息。（例如下面代码中的语句）
#region Context Menu
//Though we dont execute any logic on Right Mouse button down,we need to ensure the event is set to be handled to allow
//the subsequent Right Mouse button up to be raised on the control. The context menu is displayed when the right mouse
//button up event is raised.
private void rtb_MouseRightButtonDown(object sender,MouseButtonEventArgs e)
{
e.Handled = true;
}
private void rtb_MouseRightButtonUp(object sender,MouseButtonEventArgs e)
{
//Construct and display the context menu
RTBContextMenu menu = new RTBContextMenu(rtb);
menu.Show(e.GetPosition(LayoutRoot));
}
#endregion
本文笔者以其工作经验总结出：鼠标右键有3种方法实现方法，以供各位朋友参考学习。
第一种，自己绘制右键菜单。
Ⅰ自己绘制右键菜单需要写一个处理菜单的基类。该基类处理类主要负责右键菜单的弹出、定位、关闭等等！（代码如下）
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Controls.Primitives;
namespace SilverlightTextEditor
{
// This is an abstract base class that captures the building block functionality for a context menu
// including constructing and displaying a blank menu and method for closing the menu (called by default when
// the mouse is clicked outside the context menu
// Note that though this class is called ContextMenu after the most common usage for this pattern,you can use this
// popup window to display any arbitrary control(s)/
// A child class will have to implement the GetContent() method to return a FrameworkElement
// that encapsulates the controls that you need to be displayed on the context menu.
public abstract class ContextMenu
{
private Point _location;
private bool _isShowing;
private Popup _popup;
private Grid _grid;
private Canvas _canvas;
private FrameworkElement _content;
//Intiialize and show the popup window. This is the public method to call to display the ContextMenu at the desired location.
public void Show(Point location)
{
if (_isShowing)
throw new InvalidOperationException();
_isShowing = true;
_location = location;
ConstructPopup();
_popup.IsOpen = true;
}
//Close the popup window
public void Close()
{
_isShowing = false;
if (_popup != null)
{
_popup.IsOpen = false;
}
}
//abstract function that the child class needs to implement to return the framework element that needs to be displayed in the popup window.
protected abstract FrameworkElement GetContent();
//Default behavior for OnClickOutside() is to close the context menu when there is a mouse click event outside the context menu
protected virtual void OnClickOutside()
{
Close();
}
// Construct a popup window thats the size of the application with a grid layout
// Add a canvas as a child of the grid layout to detect mouse clicks outside the context menu
// Add the Framework Element returned by GetContent() to the grid and position it at _location
private void ConstructPopup()
{
if (_popup != null)
return;
_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);
_grid.Children.Add(_content);
UpdateSize();
}
private void UpdateSize()
{
_grid.Width = Application.Current.Host.Content.ActualWidth;
_grid.Height = Application.Current.Host.Content.ActualHeight;
if (_canvas != null)
{
_canvas.Width = _grid.Width;
_canvas.Height = _grid.Height;
}
}
}
}
Ⅱ右键菜单界面的实现
上面我们已经构建了一个右键菜单的处理基类，现在就让我们来写一个右键菜单的界面吧！
using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Media.Effects;
using System.Windows.Media.Imaging;
namespace SilverlightTextEditor
{
//Derives from the abstract class ContextMenu that provides the boilerplate code for displaying a popup window.
public class RTBContextMenu : ContextMenu
{
RichTextBox rtb;
public RTBContextMenu(RichTextBox rtb)
{
this.rtb = rtb;
}
//Construct the context menu and return the parent FrameworkElement.
protected override FrameworkElement GetContent()
{
Border border = new Border() { BorderBrush = new SolidColorBrush(Color.FromArgb(255,167,171,176)),BorderThickness = new Thickness(1),Background = new SolidColorBrush(Colors.White) };
border.Effect = new DropShadowEffect() { BlurRadius = 3,Color = Color.FromArgb(255,230,227,236) };
Grid grid = new Grid() { Margin = new Thickness(1) };
grid.ColumnDeFinitions.Add(new ColumnDeFinition() { Width = new GridLength(25) });
grid.ColumnDeFinitions.Add(new ColumnDeFinition() { Width = new GridLength(105) });
grid.Children.Add(new Rectangle() { Fill = new SolidColorBrush(Color.FromArgb(255,233,238,238)) });
grid.Children.Add(new Rectangle() { Fill = new SolidColorBrush(Color.FromArgb(255,226,228,231)),HorizontalAlignment = HorizontalAlignment.Right,Width = 1 });
//cut
Button cutButton = new Button() { Height = 22,Margin = new Thickness(0,0),HorizontalAlignment = HorizontalAlignment.Stretch,VerticalAlignment = VerticalAlignment.Top,HorizontalContentAlignment = HorizontalAlignment.Left };
cutButton.Style = Application.Current.Resources["ContextMenuButton"] as Style;
cutButton.Click += cut_MouseLeftButtonUp;
Grid.SetColumnSpan(cutButton,2);
StackPanel sp = new StackPanel() { Orientation = Orientation.Horizontal };
Image cutimage = new Image() { HorizontalAlignment = HorizontalAlignment.Left,Width = 16,Height = 16,Margin = new Thickness(1,0) };
cutimage.source = new BitmapImage(new Uri("/SilverlightTextEditor;component/images/cut.png",UriKind.RelativeOrAbsolute));
sp.Children.Add(cutimage);
TextBlock cutText = new TextBlock() { Text = "Cut",HorizontalAlignment = HorizontalAlignment.Left,Margin = new Thickness(16,0) };
sp.Children.Add(cutText);
cutButton.Content = sp;
grid.Children.Add(cutButton);
//copy
Button copyButton = new Button() { Height = 22,24,HorizontalContentAlignment = HorizontalAlignment.Left };
copyButton.Style = Application.Current.Resources["ContextMenuButton"] as Style;
copyButton.Click += copy_MouseLeftButtonUp;
Grid.SetColumnSpan(copyButton,2);
sp = new StackPanel() { Orientation = Orientation.Horizontal };
Image copyImage = new Image() { HorizontalAlignment = HorizontalAlignment.Left,0) };
copyImage.source = new BitmapImage(new Uri("/SilverlightTextEditor;component/images/copy.png",UriKind.RelativeOrAbsolute));
sp.Children.Add(copyImage);
TextBlock copyText = new TextBlock() { Text = "copy",0) };
sp.Children.Add(copyText);
copyButton.Content = sp;
grid.Children.Add(copyButton);
//paste
Button pasteButton = new Button() { Height = 22,48,HorizontalContentAlignment = HorizontalAlignment.Left };
pasteButton.Style = Application.Current.Resources["ContextMenuButton"] as Style;
pasteButton.Click += paste_MouseLeftButtonUp;
Grid.SetColumnSpan(pasteButton,2);
sp = new StackPanel() { Orientation = Orientation.Horizontal };
Image pasteImage = new Image() { HorizontalAlignment = HorizontalAlignment.Left,0) };
pasteImage.source = new BitmapImage(new Uri("/SilverlightTextEditor;component/images/paste.png",UriKind.RelativeOrAbsolute));
sp.Children.Add(pasteImage);
TextBlock pasteText = new TextBlock() { Text = "Paste",0) };
sp.Children.Add(pasteText);
pasteButton.Content = sp;
grid.Children.Add(pasteButton);
border.Child = grid;
return border;
}
//
//handle the cut,copy and paste actions when the appropriate button on the context menu is clicked.
//
void cut_MouseLeftButtonUp(object sender,RoutedEventArgs e)
{
Clipboard.SetText(rtb.Selection.Text);
rtb.Selection.Text = "";
Close();
}
void copy_MouseLeftButtonUp(object sender,RoutedEventArgs e)
{
Clipboard.SetText(rtb.Selection.Text);
Close();
}
void paste_MouseLeftButtonUp(object sender,RoutedEventArgs e)
{
rtb.Selection.Text = Clipboard.GetText();
Close();
}
}
}