自画内容的Clistctrl子类，OnCustomDraw中为什么没出现dwDrawStage=CDDS_ITEMPREPAINT | CDDS_SUBITEM的情况？

[collecte]

代码如下：

BOOL CGridCtrl::OnCustomDraw(IN NMHDR* Header, OUT LRESULT* Result)
{
mDraw.cd = reinterpret_cast<NMLVCUSTOMDRAW*>(Header);

switch(mDraw.cd->nmcd.dwDrawStage)
{
case CDDS_PREPAINT:
{
跟踪时有进入
}
case CDDS_ITEMPREPAINT | CDDS_SUBITEM:
{
跟踪时没有进入
};

}
}




// 自画代码
void CGridCtrl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// lpDrawItemStruct->itemState = ;

TCHAR lpBuffer[256];

LV_ITEM lvi;

lvi.mask = LVIF_TEXT | LVIF_PARAM ;
lvi.iItem = lpDrawItemStruct->itemID ;
lvi.iSubItem = 0;
lvi.pszText = lpBuffer ;
lvi.cchTextMax = sizeof(lpBuffer);
VERIFY(GetItem(&lvi));

LV_COLUMN lvc, lvcprev ;
::ZeroMemory(&lvc, sizeof(lvc));
::ZeroMemory(&lvcprev, sizeof(lvcprev));
lvc.mask = LVCF_WIDTH | LVCF_FMT;
lvcprev.mask = LVCF_WIDTH | LVCF_FMT;

for ( int nCol=0; GetColumn(nCol, &lvc); nCol++)
{
if ( nCol > 0 )
{
// Get Previous Column Width in order to move the next display item
GetColumn(nCol-1, &lvcprev) ;
lpDrawItemStruct->rcItem.left += lvcprev.cx ;
lpDrawItemStruct->rcItem.right += lpDrawItemStruct->rcItem.left ;
}

// Get the text
::ZeroMemory(&lvi, sizeof(lvi));
lvi.iItem = lpDrawItemStruct->itemID;
lvi.mask = LVIF_TEXT | LVIF_PARAM;
lvi.iSubItem = nCol;
lvi.pszText = lpBuffer;
lvi.cchTextMax = sizeof(lpBuffer);
VERIFY(GetItem(&lvi));

CDC* pDC;
pDC = CDC::FromHandle(lpDrawItemStruct->hDC);

if ( lpDrawItemStruct->itemState & ODS_SELECTED )
{
pDC->FillSolidRect(&lpDrawItemStruct->rcItem, GetSysColor(COLOR_HIGHLIGHT)) ;
pDC->SetTextColor(GetSysColor(COLOR_HIGHLIGHTTEXT)) ;
}
else
{
pDC->FillSolidRect(&lpDrawItemStruct->rcItem, GetSysColor(COLOR_WINDOW)) ;
pDC->SetTextColor(GetSysColor(COLOR_WINDOWTEXT)) ;
}

pDC->SelectObject(GetStockObject(DEFAULT_GUI_FONT));

UINT uFormat = DT_LEFT ;

::DrawText(lpDrawItemStruct->hDC, lpBuffer, strlen(lpBuffer),
&lpDrawItemStruct->rcItem, uFormat) ;

pDC->SelectStockObject(SYSTEM_FONT) ;
}
}

[中级伴读]

在case CDDS_PREPAINT:
{
//这里加入
*Result = CDRF_NOTIFYITEMDRAW;
}

[collecte]

slackwater(山林风雨) :

加了的啊！！

BOOL CGridCtrl::OnCustomDraw(IN NMHDR* Header, OUT LRESULT* Result)
{
static LVITEM Item;
static RECT ItemRect, ClientRect;
static CImageList* il = NULL;
static int CellOffset, ScrollPos;
static UINT8 Spacing;
static int Row, Col;

mDraw.cd = reinterpret_cast<NMLVCUSTOMDRAW*>(Header);

switch(mDraw.cd->nmcd.dwDrawStage)
{
case CDDS_PREPAINT:
// request ITEM notification
*Result = CDRF_NOTIFYITEMDRAW;

// cache the small image list
il = GetImageList(LVSIL_SMALL);

// treat "LVS_EX_GRIDLINES"
Spacing = (HasGridLines() ? 1 : 0);

// prepare LVITEM
Item.pszText = mBuffer;
Item.cchTextMax = mBufferLen;
Item.mask = LVIF_IMAGE | LVIF_TEXT;

// painting preparations
GetClientRect(&ClientRect);
mDraw.CellText = mBuffer;
mDraw.GridLines = HasGridLines();

::SetBkMode(DC, TRANSPARENT);
break;

case CDDS_ITEMPREPAINT:
// request SUBITEM notification
*Result = CDRF_NOTIFYSUBITEMDRAW;
// cache item rect
GetItemRect(ROW, &ItemRect, LVIR_BOUNDS);

// init
CellOffset = 0;
ScrollPos = GetScrollPos(SB_HORZ);
Item.iItem = ROW;

break;

case CDDS_ITEMPREPAINT | CDDS_SUBITEM:
{
// it might happen that the first subitem drawn has a wrong index (>0) (double click on column header to automatically resize)
// in this case the index will be corrected (windows bug??)
if (CellOffset == 0 && COL != 0)
COL = 0;

mDraw.Icon = -1;
Row = ROW;
Col = COL;

static LVCOLUMN lvc;
lvc.mask = LVCF_FMT;
GetColumn(Col, &lvc);
mDraw.Justify = (UINT8)(lvc.fmt & LVCFMT_JUSTIFYMASK);

// compute cell rect (not using GetCellRect() for extra performance)
mDraw.Rect.top = ItemRect.top;
mDraw.Rect.bottom = ItemRect.bottom;

mDraw.Rect.left = CellOffset - ScrollPos;
CellOffset += GetColumnWidth(Col);

if (Col > 0)
mDraw.Rect.left += Spacing;
mDraw.Rect.bottom -= Spacing;
mDraw.Rect.right = CellOffset - ScrollPos;

// do not draw the cell if it's not visible
if (mDraw.Rect.right < ClientRect.left ||
mDraw.Rect.left > ClientRect.right)
{
*Result = CDRF_SKIPDEFAULT;
break;
}

// get cell info
Item.iSubItem = Col;
GetItem(&Item);
mDraw.Type = OnGetCellType(Row, Col);

// draw the icon
if (mDraw.Type != CELL_SEPARATOR && il && Item.iImage >= 0)
{
mDraw.Icon = Item.iImage;

// erase icon background
mDraw.Rect.right = mDraw.Rect.left + 17;
::FillRect(DC, &mDraw.Rect, mDraw.BrushNormalFill);

// draw the icon
ImageList_Draw( il->m_hImageList,
Item.iImage,
DC,
mDraw.Rect.left,
mDraw.Rect.top,
ILD_TRANSPARENT);

// update remaining cell rect (jump over the icon)
mDraw.Rect.left += 17;
}
mDraw.Rect.right = CellOffset - ScrollPos;

// draw the label
if (RWIDTH(&mDraw.Rect) > 1)
{
mDraw.Focused = (Row == mRow && Col == mCol && GetFocus() == this);
mDraw.Selected = (Col == mCol && GetItemState(Row, LVIS_SELECTED) != 0);
switch (mDraw.Type)
{
case CELL_REGULAR:
DrawRegularCell();
break;

case CELL_EDITBOX:
DrawEditBoxCell();
break;

case CELL_COMBOBOX:
case CELL_EDITCOMBOBOX:
DrawComboBoxCell();
break;

case CELL_CHECKBOXON:
case CELL_CHECKBOXOFF:
DrawCheckBoxCell();
break;

case CELL_CUSTOMEDITOR:
DrawCustomCell();
break;

case CELL_SEPARATOR:
DrawSeparatorCell();
break;

}

*Result = CDRF_SKIPDEFAULT;
break;
}
}

default:
*Result = CDRF_DODEFAULT;
}

return TRUE;
}

[collecte]

up

[antimicro]

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