按键处理:OfferKeyEventL

virtual TKeyResponse OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType)

按下后触发三次OfferKeyEventL:EEventKeyDown->EEventKey->EEventKeyUp

1.只处理一个EEVENTKEY事件 简化思路
{
 {
 if ( aType!= EEventKey )
  {
  return EKeyWasNotConsumed;
  }
 }

TChar charCode( aKeyEvent.iCode );

switch(charCode)
{

case EKeyLeftArrow:
  break;
case EKeyRightArrow:
  iSim1->SetFocus(!iSim1->IsFocused);
  iSim2->SetFocus(!iSim2->IsFocused);
  DrawDow();
  break;

case EKeyDevice3: //ok
  break;
case EKeySpace:
  break;

case EKeyBackspace:
  break;

}
return EKeyWasConsumed; //如果执行了该句了 就不向下传递
}