自绘Combobox里的item白边

Question

 

如图，自绘Drop List模式的combobox，第一次显示正常，但在选择一个item后就会出现一个白边，请问怎么消除掉？谢谢！

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我是快乐的小鱼^_^

Answer 1

可能是您自绘的DrawItem中处理的有问题吧~

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Visual C++ enthusiast, like network programming and driver development. At present is being engaged in the WinCE/Windows Mobile platform embedded development.

Answer 2

查找了，没找到，纠结

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我是快乐的小鱼^_^

Answer 3

你好，

 

您能否提供给我们一些实例代码，这样可以方便我们重现您的问题？

我们期待您的回信，并乐意帮助您解决您的问题

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Rob Pan [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 4

void PngCombobox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
	//绘制Item背景和字符串
	Graphics graphics(lpDrawItemStruct -> hDC);
	int curID = lpDrawItemStruct -> itemID;	
	CRect itemTempRect( lpDrawItemStruct -> rcItem);
	
	Rect itemRect(itemTempRect.left, itemTempRect.top, itemTempRect.Width(), itemTempRect.Height());	//已选择项的Rect
	Rect itemBgRect(itemRect);		//未选择项的Rect

	if ((lpDrawItemStruct->itemAction | ODA_SELECT) &&
		(lpDrawItemStruct->itemState & ODS_SELECTED))
	{
		graphics.DrawImage(_selectButtonImage, itemRect, BUTTON_CLICK * _listButtonW, 0, _listButtonW, _listButtonH, UnitPixel);
	}
	else
	{
		SolidBrush bgBrush(Color(80, 80, 80));
		graphics.FillRectangle(&bgBrush, itemBgRect);
		graphics.DrawImage(_listImage, itemBgRect, 0, 0, _listW, _listH, UnitPixel);
	}

	//绘制Item字符串
	if((curID != -1) && _DrawChars)
	{
		Gdiplus::Font myFont(L"宋体", 10.0f);
		PointF point( itemTempRect.left + 2.0f, itemTempRect.top + 2.0f);
		SolidBrush whiteBrush(Color(200,200,200));

		CString itemText;
		GetLBText(curID,itemText);							//获取当前Item字符串
		wstring witemText(itemText.AllocSysString());		//转换为wstring
		graphics.DrawString(witemText.c_str(), -1, &myFont, point, &whiteBrush);
	}
}

void PngCombobox::OnPaint()
{
	CPaintDC dc(this); 

	Graphics graphics(dc.m_hDC);
	
	CRect rect;
	GetClientRect(&rect);

	graphics.DrawImage(_staticImage,Rect(0, 0, rect.Width(), rect.Height()),
							_staticW * _State, 0, _staticW, _staticH, UnitPixel);

	COMBOBOXINFO info;
	info.cbSize = sizeof info;
	GetComboBoxInfo(&info);
	RECT ItemRect = info.rcItem;
	Gdiplus::Font myFont(L"宋体", 10.0f);
	PointF point( ItemRect.left + 2.0f, ItemRect.top + 2.0f);
	SolidBrush whiteBrush(Color(200,200,200));

	CString itemText;
	GetLBText(GetCurSel(), itemText);
	wstring witemText(itemText.AllocSysString());
	graphics.DrawString(witemText.c_str(), -1, &myFont, point, &whiteBrush);
}

 

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我是快乐的小鱼^_^