Windows Phone 7 program menu bar ApplicationBar

ApplicationBar control is a menu on Windows Phone 7, which is a traditional windowsProgram.
The classes related to ApplicationBar (applicationbariconbutton and applicationbarmenuitem) are defined in the Microsoft. Phone. Shell namespace. The class layers of conventional Silverlight programming such as uielement and frameworkelement are completely separated. Strictly speaking, ApplicationBar is not part of your page visualization.
An ApplicationBar can contain up to four buttons. You can use menu items to add additional options. These menu items are not displayed by default. It is displayed only when you click the ellipsis (or area below the ellipsis) on the right of the menu bar.

This project contains a mediaelement movieplayer to play a video, and ApplicationBar contains the first, play, pause, and last four options.

 <! --  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  ="  >  
  <  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.remo-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  ;
}
}
}
}