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。
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 as ApplicationBarIconButton;
appbarPlayButton = this.ApplicationBar.Buttons as ApplicationBarIconButton;
appbarPauseButton = this.ApplicationBar.Buttons as ApplicationBarIconButton;
appbarEndButton = this.ApplicationBar.Buttons 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;
}
}
}
}
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