全屏是指Status Pane和Control Pane都隐藏，Main Pane占据整个屏幕。这里提供一种简单的方法。

1. 修改AppView类的ConstructL()为：

void CTetrisAppView::ConstructL(const TRect& aRect)
{

    CreateWindowL();
    SetRect(aRect);

    // 获取status Pane和Tool Bar的指针 

   MEikAppUiFactory* f = CEikonEnv::Static()->AppUiFactory();
    iStatusPane = f->StatusPane();
    iToolBar = f->ToolBar();

    // Activate the window, which makes it ready to be drawn
    ActivateL();
}

    2.    在AppView类添加Command()函数，代码如下：

void CTetrisAppView::Command(TInt aCommand)
{
     if( aCommand == ECommand1 )
    {
          iFullScreen ^= 1;
          if( iFullScreen )
          { 
                  if( iToolBar )
                  {
                        iToolBar->SetCommandL( 0, ECommand1, _L("Exit\nfullscreen") );
                        iToolBar->MakeVisible( EFalse );
                  }
                 if( iStatusPane )
                 {
                        iStatusPane->MakeVisible( EFalse );
                 }

                SetExtentToWholeScreen();
          }
          else
          {
               if( iToolBar )
               {
                     iToolBar->SetCommandL( 0, ECommand1, _L("Fullscreen") );
                     iToolBar->MakeVisible( ETrue );
                      iToolBar->DrawNow();
               }
              if( iStatusPane )
              {
                      iStatusPane->MakeVisible( ETrue );
              }
   
              TRect rect = CEikonEnv::Static()->EikAppUi()->ClientRect();
   
              SetPosition( rect.iTl );
              TSize size = rect.Size();
              SetSize( size );
         }
    }
}