专门做界面已经有半年了，期间用得最多也就是Owner Draw，对于Cutom Draw只是知之一二，没有具体用过，其实Ower Draw用得最多也就是Button，ListBox两个，由于项目中有个同事把TreeCtrl进行Custom Draw了，效果很不错，这才意识到其强大及易用，相比较而言Ower Draw就复杂多了，今天再次把CP上那篇经典的关于Custom Draw文章看了一篇，用了半个小时写了Slider的Custom Draw，也算是为了练习使用WTL和GDI+：
class CCDSliderCtrl : public CWindowImpl<CCDSliderCtrl,CTrackBarCtrl>,
public CCustomDraw<CCDSliderCtrl>
{
public:
BEGIN_MSG_MAP(CCDSliderCtrl)
CHAIN_MSG_MAP_ALT(CCustomDraw< CCDSliderCtrl >, 1)
DEFAULT_REFLECTION_HANDLER()
END_MSG_MAP()
public:
CCDSliderCtrl():m_pImageThumb(NULL),m_pImageChannel(NULL)
{
}
~CCDSliderCtrl()
{
if (NULL!=m_pImageThumb)
{
delete m_pImageThumb;
m_pImageThumb=NULL;
}
if (NULL!=m_pImageChannel)
{
delete m_pImageChannel;
m_pImageChannel=NULL;
}
}
void SetImage(LPCTSTR lpszThumb,LPCTSTR lpszChannel)
{
if (NULL!=m_pImageThumb)
{
delete m_pImageThumb;
m_pImageThumb=NULL;
}
m_pImageThumb=new Image((WCHAR*)lpszThumb);
if (NULL!=m_pImageChannel)
{
delete m_pImageChannel;
m_pImageChannel=NULL;
}
m_pImageChannel=new Image((WCHAR*)lpszChannel);
}
DWORD OnPrePaint( int idCtrl, LPNMCUSTOMDRAW lpNMCustomDraw )
{
return CDRF_NOTIFYITEMDRAW;
}
DWORD OnItemPrePaint( int idCtrl, LPNMCUSTOMDRAW lpNMCustomDraw )
{
Graphics graphics(lpNMCustomDraw->hdc);
CRect rcThumb(lpNMCustomDraw->rc);
switch ( lpNMCustomDraw->dwItemSpec )
{
case TBCD_CHANNEL:
{
CRect rcClient;
GetClientRect( &rcClient);
ImageAttributes imAtt;
imAtt.SetColorKey(
Color(255, 0,255),
Color(255, 0,255),
ColorAdjustTypeBitmap);
graphics.DrawImage(
m_pImageChannel,
Rect(0, 0, rcClient.Width(),rcClient.Height()), // dest rect
0, 0, m_pImageChannel->GetWidth(),m_pImageChannel->GetHeight(), // source rect
UnitPixel,
&imAtt);
break;
}
case TBCD_TICS:
return CDRF_DODEFAULT;
case TBCD_THUMB:
{
graphics.DrawImage(m_pImageThumb,Rect(rcThumb.left,rcThumb.top,rcThumb.Width(),rcThumb.Height()));
break;
}
default:
ATLASSERT( FALSE );
};
return CDRF_SKIPDEFAULT;
}
protected:
Gdiplus::Image* m_pImageThumb;
Gdiplus::Image* m_pImageChannel;
};
下面是效果图：
