treeview and 透明。(200分)

FORM1上放一BMP为背景图片。
想在图片上放一TreeView控件，设TreeView为透明。

请问能办到吗？请给出提示。

我想应该是在treeview的canvas中绘图，不是把treeview设为透明

用CANVAS画，项目展开会留下空白。

UP

gz

没玩过

留下空白，再重画

有哪位兄台给个ＣＯＤＥ？ 我自己实在没辙。

试试richview

这是一段VC的源代码，自己转化一下吧

// MyTreeCtrl.cpp : implementation file
//

#include "StdAfx.h"
#include "Tree.h"
#include "MyTreeCtrl.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMyTreeCtrl

CMyTreeCtrl::CMyTreeCtrl()
{
}

CMyTreeCtrl::~CMyTreeCtrl()
{
}


BEGIN_MESSAGE_MAP(CMyTreeCtrl, CTreeCtrl)
//{{AFX_MSG_MAP(CMyTreeCtrl)
ON_WM_PAINT()
ON_WM_ERASEBKGND()
ON_NOTIFY_REFLECT(TVN_ITEMEXPANDED, OnItemexpanded)
ON_NOTIFY_REFLECT(TVN_ITEMEXPANDING, OnItemexpanding)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyTreeCtrl message handlers
BOOL CMyTreeCtrl::SetBKImage(LPCTSTR LpszResource)
{

// if this is not the first call then delete gdi objects
if( m_bitmap.m_hObject != NULL )
m_bitmap.DeleteObject();

HBITMAP hbmp = (HBITMAP)::LoadImage(AfxGetInstanceHandle(),
LpszResource, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION|LR_LOADFROMFILE);

if( hbmp == NULL )
return FALSE;

m_bitmap.Attach( hbmp );

return TRUE;
}

LRESULT CMyTreeCtrl::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
// TODO: Add your specialized code here and/or call the base class

return CTreeCtrl::WindowProc(message, wParam, lParam);
}

void CMyTreeCtrl::OnPaint()
{
CPaintDC dc(this); // device context for painting

CRect rcclient;
GetClientRect(&rcclient);

// create a compatible memory dc
CDC memdc;
memdc.CreateCompatibleDC(&dc);
CBitmap bitmap;
bitmap.CreateCompatibleBitmap(&dc, rcclient.Width(), rcclient.Height());
memdc.SelectObject( &bitmap );

CWnd:efWindowProc(WM_PAINT, (WPARAM)memdc.m_hDC , 0);

CDC maskdc;
maskdc.CreateCompatibleDC(&dc);
CBitmap maskbitmap;
maskbitmap.CreateBitmap(rcclient.Width(), rcclient.Height(), 1, 1, NULL);
maskdc.SelectObject( &maskbitmap );
maskdc.BitBlt( 0, 0, rcclient.Width(), rcclient.Height(), &memdc,
rcclient.left, rcclient.top, SRCCOPY);

CBrush brush;
brush.CreatePatternBrush(&m_bitmap);
dc.FillRect(rcclient, &brush);

memdc.SetBkColor(RGB(0,0,0));
memdc.SetTextColor(RGB(255,255,255));
memdc.BitBlt(rcclient.left, rcclient.top, rcclient.Width(), rcclient.Height(), &maskdc, rcclient.left, rcclient.top, SRCAND);

dc.SetBkColor(RGB(255,255,255));
dc.SetTextColor(RGB(0,0,0));
dc.BitBlt(rcclient.left, rcclient.top, rcclient.Width(), rcclient.Height(), &maskdc, rcclient.left, rcclient.top, SRCAND);

dc.BitBlt(rcclient.left, rcclient.top, rcclient.Width(), rcclient.Height(), &memdc,
rcclient.left, rcclient.top,SRCPAINT);
brush.DeleteObject();
}


BOOL CMyTreeCtrl::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default
return TRUE;
}

void CMyTreeCtrl::OnItemexpanded(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
// TODO: Add your control notification handler code here
Invalidate();
SetRedraw(TRUE);
*pResult = 0;
}

void CMyTreeCtrl::OnItemexpanding(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
// TODO: Add your control notification handler code here
SetRedraw(FALSE);
*pResult = 0;
}

多人接受答案了。