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;
}
}
}
}

posted on 2011-02-17 22:40  linzheng  阅读(1699)  评论(1编辑  收藏  举报

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