Symbian前后台转换程序

GUI应用前后台切换

原创于 2009-05-07 17:09:00 发布 · 924 阅读

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#symbian #application #keyboard

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本文介绍了如何使用Symbian平台的API实现GUI应用程序在前台和后台之间的切换。具体包括将应用发送到后台的方法及从后台带回前台的方法，并处理键盘焦点变化的情况。

//The code above show you steps that will send your GUI application to the background
void CAirLightAppUi::SendToBackground()
{
TApaTask task ( CEikonEnv::Static()->WsSession() );

task.SetWgId( CEikonEnv::Static()->RootWin().Identifier() );

task.SendToBackground();
}

//The code above show you steps that will send your GUI application to the BringToForeground
void CAirLightAppUi::BringToForeground()
{
TApaTask task ( CEikonEnv::Static()->WsSession() );

    task.SetWgId( CEikonEnv::Static()->RootWin().Identifier() );

    task.BringToForeground();
}

// Handles changes in keyboard focus when an application switches to, or from, the foreground.
void CAirLightAppUi::HandleForegroundEventL(TBool aForeground)
{
if (aForeground)
  {
  BringToForeground();
  }
else
  {
  SendToBackground();
  }
}