Windows Phone 7 程序菜单栏ApplicationBar

ApplicationBar控件时windows phone 7上的一个菜单，它传统的Windows程序的菜单的作用类似。
ApplicationBar（ApplicationBarIconButton和ApplicationBarMenuItem）相关的类定义在Microsoft.Phone.Shell命名空间。与UIElement和FrameworkElement等常规Silverlight编程的类层次是完全分开的，严格说来ApplicationBar不是你的页面的可视化的一部分。
一个ApplicationBar最多可包含四个按钮。如果还有额外的选项可以通过菜单项来添加，这些菜单项默认是不显示的。只有在点击菜单栏右侧的省略号(或省略号下方的区域)时才会显示出来。

该项目包含一个MediaElement MoviePlayer播放影片，而ApplicationBar包含第一，播放，暂停，最后四个选项。

  
    

   
     <!--
   
     LayoutRoot contains the root grid where all other page content is placed
   
     -->
   
     
 
   
     <
   
     Grid 
   
     x:Name
   
     ="LayoutRoot"
   
      Background
   
     ="Transparent"
   
     >
   
     
 
   
     <
   
     Grid.RowDefinitions
   
     >
   
     
 
   
     <
   
     RowDefinition 
   
     Height
   
     ="Auto"
   
     />
   
     
 
   
     <
   
     RowDefinition 
   
     Height
   
     ="*"
   
     />
   
     
 
   
     </
   
     Grid.RowDefinitions
   
     >
   
     

 
   
     <!--
   
     TitlePanel contains the name of the application and page title
   
     -->
   
     
 
   
     <
   
     StackPanel 
   
     x:Name
   
     ="TitlePanel"
   
      Grid.Row
   
     ="0"
   
      Margin
   
     ="12,17,0,28"
   
     >
   
     
 
   
     <
   
     TextBlock 
   
     x:Name
   
     ="ApplicationTitle"
   
      Text
   
     ="MOVIE PLAYER"
   
      Style
   
     ="
   
     {StaticResource PhoneTextNormalStyle}
   
     "
   
     />
   
     
 
   
     </
   
     StackPanel
   
     >
   
     

 
   
     <
   
     Grid 
   
     x:Name
   
     ="ContentPanel"
   
      Grid.Row
   
     ="1"
   
      Margin
   
     ="12,0,12,0"
   
     >
   
     
 
   
     <
   
     MediaElement 
   
     Name
   
     ="mediaElement"
   
      
 Source
   
     ="http://localhost/123.wmv"
   
     
 AutoPlay
   
     ="False"
   
     
 MediaOpened
   
     ="OnMediaElementMediaOpened"
   
     
 MediaFailed
   
     ="OnMediaElementMediaFailed"
   
     
 CurrentStateChanged
   
     ="OnMediaElementCurrentStateChanged"
   
      
   
     />
   
     

 
   
     <
   
     TextBlock 
   
     Name
   
     ="statusText"
   
     
 HorizontalAlignment
   
     ="Left"
   
     
 VerticalAlignment
   
     ="Bottom"
   
      
   
     />
   
     

 
   
     <
   
     TextBlock 
   
     Name
   
     ="errorText"
   
     
 HorizontalAlignment
   
     ="Right"
   
     
 VerticalAlignment
   
     ="Bottom"
   
     
 TextWrapping
   
     ="Wrap"
   
      
   
     />
   
     
 
   
     </
   
     Grid
   
     >
   
     
 
   
     </
   
     Grid
   
     >
   
     

 
   
     <
   
     phone:PhoneApplicationPage.ApplicationBar
   
     >
   
     
 
   
     <
   
     shell:ApplicationBar
   
     >
   
     
 
   
     <
   
     shell:ApplicationBarIconButton 
 
   
     x:Name
   
     ="appbarRewindButton"
   
     
 IconUri
   
     ="Images/appbar.transport.rew.rest.png"
   
      
 Text
   
     ="rewind"
   
     
 IsEnabled
   
     ="False"
   
     
 Click
   
     ="OnAppbarRewindClick"
   
      
   
     />
   
     

 
   
     <
   
     shell:ApplicationBarIconButton 
 
   
     x:Name
   
     ="appbarPlayButton"
   
     
 IconUri
   
     ="Images/appbar.transport.play.rest.png"
   
      
 Text
   
     ="play"
   
     
 IsEnabled
   
     ="False"
   
     
 Click
   
     ="OnAppbarPlayClick"
   
      
   
     />
   
     

 
   
     <
   
     shell:ApplicationBarIconButton
 
   
     x:Name
   
     ="appbarPauseButton"
   
     
 IconUri
   
     ="Images/appbar.transport.pause.rest.png"
   
      
 Text
   
     ="pause"
   
     
 IsEnabled
   
     ="False"
   
     
 Click
   
     ="OnAppbarPauseClick"
   
      
   
     />
   
     

 
   
     <
   
     shell:ApplicationBarIconButton
 
   
     x:Name
   
     ="appbarEndButton"
   
     
 IconUri
   
     ="Images/appbar.transport.ff.rest.png"
   
      
 Text
   
     ="to end"
   
     
 IsEnabled
   
     ="False"
   
     
 Click
   
     ="OnAppbarEndClick"
   
      
   
     />
   
     
 
   
     </
   
     shell:ApplicationBar
   
     >
   
     
 
   
     </
   
     phone:PhoneApplicationPage.ApplicationBar
   
     >
  
    

View Code

   
     

    
      using
    
       System;

    
      using
    
       System.Windows;

    
      using
    
       System.Windows.Media;

    
      using
    
       Microsoft.Phone.Controls;

    
      using
    
       Microsoft.Phone.Shell;


    
      namespace
    
       MoviePlayer
{
 
    
      public
    
       
    
      partial
    
       
    
      class
    
       MainPage : PhoneApplicationPage
 {
 
    
      //
    
       Constructor
    
      

    
       
    
      public
    
       MainPage()
 {
 InitializeComponent();

 
    
      //
    
       Re-assign names already in the XAML file
    
      

    
       appbarRewindButton 
    
      =
    
       
    
      this
    
      .ApplicationBar.Buttons[
    
      0
    
      ] 
    
      as
    
       ApplicationBarIconButton;
 appbarPlayButton 
    
      =
    
       
    
      this
    
      .ApplicationBar.Buttons[
    
      1
    
      ] 
    
      as
    
       ApplicationBarIconButton;
 appbarPauseButton 
    
      =
    
       
    
      this
    
      .ApplicationBar.Buttons[
    
      2
    
      ] 
    
      as
    
       ApplicationBarIconButton;
 appbarEndButton 
    
      =
    
       
    
      this
    
      .ApplicationBar.Buttons[
    
      3
    
      ] 
    
      as
    
       ApplicationBarIconButton;
 }

 
    
      //
    
       ApplicationBar buttons
    
      

    
       
    
      void
    
       OnAppbarRewindClick(
    
      object
    
       sender, EventArgs args)
 {
 mediaElement.Position 
    
      =
    
       TimeSpan.Zero;
 }

 
    
      void
    
       OnAppbarPlayClick(
    
      object
    
       sender, EventArgs args)
 {
 mediaElement.Play();
 }

 
    
      void
    
       OnAppbarPauseClick(
    
      object
    
       sender, EventArgs args)
 {
 mediaElement.Pause();
 }

 
    
      void
    
       OnAppbarEndClick(
    
      object
    
       sender, EventArgs args)
 {
 mediaElement.Position 
    
      =
    
       mediaElement.NaturalDuration.TimeSpan;
 }

 
    
      //
    
       MediaElement events
    
      

    
       
    
      void
    
       OnMediaElementMediaFailed(
    
      object
    
       sender, ExceptionRoutedEventArgs args)
 {
 errorText.Text 
    
      =
    
       args.ErrorException.Message;
 }

 
    
      void
    
       OnMediaElementMediaOpened(
    
      object
    
       sender, RoutedEventArgs args)
 {
 appbarRewindButton.IsEnabled 
    
      =
    
       
    
      true
    
      ;
 appbarEndButton.IsEnabled 
    
      =
    
       
    
      true
    
      ;
 }

 
    
      void
    
       OnMediaElementCurrentStateChanged(
    
      object
    
       sender, RoutedEventArgs args)
 {
 statusText.Text 
    
      =
    
       mediaElement.CurrentState.ToString();

 
    
      if
    
       (mediaElement.CurrentState 
    
      ==
    
       MediaElementState.Stopped 
    
      ||
    
      
 mediaElement.CurrentState 
    
      ==
    
       MediaElementState.Paused)
 {
 appbarPlayButton.IsEnabled 
    
      =
    
       
    
      true
    
      ;
 appbarPauseButton.IsEnabled 
    
      =
    
       
    
      false
    
      ;
 }
 
    
      else
    
       
    
      if
    
       (mediaElement.CurrentState 
    
      ==
    
       MediaElementState.Playing)
 {
 appbarPlayButton.IsEnabled 
    
      =
    
       
    
      false
    
      ;
 appbarPauseButton.IsEnabled 
    
      =
    
       
    
      true
    
      ;
 }
 }
 }
}