如何在combobox中加入不同类型的线条？

Question

如何在combobox中加入不同类型的线条

Answer 1

是不是还得重载DrawItem，还得处理WM_DRAWITEM，可是不知道如何具体实现啊 

Answer 2

百度吧，网上重绘combobox的示例多的很

Answer 3

void CShowComboBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct)  
{
// TODO: Add your code to determine the size of specified item
lpMeasureItemStruct->itemHeight = CComboBox::GetItemHeight(0);
}void CShowComboBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) //combobo
{
// TODO: Add your code to draw the specified item
  CDC *pDC=CDC::FromHandle(lpDrawItemStruct->hDC);
int nSaveDC=pDC->SaveDC();
CRect itemRect = lpDrawItemStruct->rcItem;
int nItem = lpDrawItemStruct->itemID;
    
if(lpDrawItemStruct->itemAction & ODA_DRAWENTIRE)
{
  DrawItemBk(pDC,itemRect,nItem, CS_NORMAL); //画正常状态item的背景
  DrawItemImage(pDC,itemRect,nItem,GetItemImage(nItem),CS_NORMAL);  
DrawItemText(pDC,itemRect,nItem,CS_NORMAL);//画正常状态item文if(!GetItemDisable(nItem))  
{
DrawItemBk(pDC,itemRect,nItem,CS_DISABLED);
DrawItemImage(pDC,itemRect,nItem,GetItemImage(nItem),CS_DISABLED);
DrawItemText(pDC,itemRect,nItem,CS_DISABLED);
}
}if((lpDrawItemStruct->itemState & ODS_SELECTED) &&  
(lpDrawItemStruct->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)) )
{
DrawItemBk(pDC,itemRect,nItem,CS_HOT);
DrawItemImage(pDC,itemRect,nItem,GetItemImage(nItem),CS_HOT);
DrawItemText(pDC,itemRect,nItem,CS_HOT);
}if(!(lpDrawItemStruct->itemState & ODS_SELECTED) &&  
(lpDrawItemStruct->itemAction & ODA_SELECT ) )
{
DrawItemBk(pDC,itemRect,nItem,CS_SELECT);
DrawItemImage(pDC,itemRect,nItem,GetItemImage(nItem),CS_SELECT);
DrawItemText(pDC,itemRect,nItem,CS_SELECT);
}pDC->RestoreDC(nSaveDC);
}void CShowComboBox::OnPaint(),多处理OnPaint主要是处理edit/static的部分,上边的drawitem是只能处理list中的.
{
CPaintDC dc(this); // device context for painting
CRect rectBk;
GetClientRect(rectBk);DrawBorder(&dc,rectBk,GetComboState());
DrawBackGround(&dc,rectBk,GetComboState());
DrawDownButton(&dc,rectBk,GetComboState()); //与按钮一样,有正常,HOT,按下和非激活状态if ( CComboBox::GetCount() >0 && CComboBox::GetCurSel() >= 0 )
{ 
int nState = CS_NORMAL;
int nItem = CComboBox::GetCurSel();
GetComboState()== CS_SELECT ? nState = CS_DISABLED : nState = CS_NORMAL ;
CString strItemText = "" ;
GetLBText(nItem,strItemText);
DrawItemText(&dc,rectBk,nItem,strItemText,nState);
DrawItemImage(&dc,rectBk,nItem,GetItemImage(nItem),nState);
}
}
由于,设置重绘的combobox,在EDIT/STATIC的部分,高度很难看,所以可以用CComboBox::SetItemHeight(-1, 13)来设置一下可以放在PreSubclassWindow中,不然太高了,难看.可以扩展,下拉列表框带列头, 支持多列,支持disiable等.稍做变动便可.