btnctrl.cpp

symbian下自制按钮实现

// BtnCtrl.cpp: implementation of the CBtnCtrl class.
//
//////////////////////////////////////////////////////////////////////

#include "BtnCtrl.h"
#include <eikenv.h>	 // CEikonEnv iEikonEnv and AKN_LAF_COLOR


//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CBtnCtrl * CBtnCtrl::NewL(const TRect& aRect, const CCoeControl* aParent,const TDesC & aCaption ) 
{
    CBtnCtrl * pBtnCtrl = NewLC(aRect, aParent,aCaption ) ;
	CleanupStack::Pop( pBtnCtrl ) ;
	return pBtnCtrl ;
}

CBtnCtrl * CBtnCtrl::NewLC(const TRect& aRect, const CCoeControl* aParent,const TDesC & aCaption ) 
{
	CBtnCtrl * pBtnCtrl = new(ELeave)CBtnCtrl(aCaption);
	CleanupStack::PushL( pBtnCtrl) ;
	pBtnCtrl->ConstructL(aRect, aParent) ; //执行二阶段构建
	return pBtnCtrl ;
}

void  CBtnCtrl::ConstructL(const TRect& aRect , const CCoeControl* aParent) 
{
    if( aParent == NULL)
		CreateWindowL( ) ;
	else
	    SetContainerWindowL(*aParent) ;

	SetRect(aRect) ;
	ActivateL(  ) ;
}


void CBtnCtrl::Draw(const TRect& aRect) const
{
    
    TBool bIsFocus = IsFocused( ) ; 
	CWindowGc & gc=SystemGc( ) ;
  
	gc.SetPenColor(KRgbBlack);
	//画背景色
	if(bIsFocus) //已获得焦点
	{
        gc.SetBrushColor(TRgb(211,200,188) ); //KRgbRed
	}	
    else
    {
        gc.SetBrushColor(KRgbWhite) ;
	}

	gc.Clear( aRect ) ;
    gc.DrawRect( aRect ) ;

	const CFont* font=iEikonEnv->AnnotationFont( );
	gc.UseFont(font);
    gc.DrawText(iCaption,aRect,16, CGraphicsContext::ELeft,15) ;
	gc.DiscardFont( );

	//font = iEikonEnv->AnnotationFont(  );

}


void CBtnCtrl::SetFocus(TBool aFocus,TDrawNow aDrawNow) 
{
	CCoeControl::SetFocus(aFocus,ENoDrawNow); 
	
	if(aDrawNow == ENoDrawNow )
	  return ;

    this->DrawDeferred(  );
}


TSize CBtnCtrl::MinimumSize( )
{
	return TSize(50,20);
}