建立一个对话框应用程序,对话框界面中有一个列表框,一组单选按钮,如果实现选择一单选按钮,列表框就显示相对应的图片.
我已在bitmap中自定义了两个图片,但是显示不出来,不知道是为什么?
分别对两个按钮做了消息处理函数,CBitmap cbmp;是我在cmy4dlg中添加的全局变量
void CMy4_3Dlg::OnRadio1()
{
// TODO: Add your control notification handler code here
cbmp.DeleteObject();
cbmp.LoadBitmap(IDB_BITMAP1);
m_cbmp.SetBitmap(HBITMAP(cbmp));
}void CMy4_3Dlg::OnRadio2()
{
// TODO: Add your control notification handler code here
cbmp.DeleteObject();
cbmp.LoadBitmap(IDB_BITMAP2);
m_cbmp.SetBitmap(HBITMAP(cbmp));
}希望能够给予指教啊!!
我已在bitmap中自定义了两个图片,但是显示不出来,不知道是为什么?
分别对两个按钮做了消息处理函数,CBitmap cbmp;是我在cmy4dlg中添加的全局变量
void CMy4_3Dlg::OnRadio1()
{
// TODO: Add your control notification handler code here
cbmp.DeleteObject();
cbmp.LoadBitmap(IDB_BITMAP1);
m_cbmp.SetBitmap(HBITMAP(cbmp));
}void CMy4_3Dlg::OnRadio2()
{
// TODO: Add your control notification handler code here
cbmp.DeleteObject();
cbmp.LoadBitmap(IDB_BITMAP2);
m_cbmp.SetBitmap(HBITMAP(cbmp));
}希望能够给予指教啊!!
http://www.codeproject.com/KB/list/listctrldemo.aspx
用用
ClassListWnd.h
#if !defined(AFX_CLASSLISTWND_H__7AC2BB02_A52A_11D6_94B5_0050FC20D215__INCLUDED_)
#define AFX_CLASSLISTWND_H__7AC2BB02_A52A_11D6_94B5_0050FC20D215__INCLUDED_#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// ClassListWnd.h : header file
///////////////////////////////////////////////////////////////////////////////
// CClassListWnd windowclass CClassListWnd : public CListCtrl
{
// Construction
public:
CClassListWnd();// Attributes
public: CPalette m_pal;
CBitmap m_bitmap;
int m_cxBitmap, m_cyBitmap; BOOL SetBkImage(LPCTSTR lpszResourceName);
BOOL SetBkImage(UINT nIDResource);
int m_nHighlight;
// Operations
public:// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CClassListWnd)
//}}AFX_VIRTUAL// Implementation
public:
virtual ~CClassListWnd(); // Generated message map functions
protected:
//{{AFX_MSG(CClassListWnd)
afx_msg void OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
afx_msg void OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
afx_msg BOOL OnEraseBkgnd(CDC* pDC);
afx_msg void OnPaletteChanged(CWnd* pFocusWnd);
afx_msg BOOL OnQueryNewPalette();
//}}AFX_MSG
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct); DECLARE_MESSAGE_MAP()
};///////////////////////////////////////////////////////////////////////////////{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.#endif // !defined(AFX_CLASSLISTWND_H__7AC2BB02_A52A_11D6_94B5_0050FC20D215__INCLUDED_)
//#include "stdafx.h"
#include "ClassListWnd.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// CClassListWndCClassListWnd::CClassListWnd()
{
m_nHighlight=0;
}CClassListWnd::~CClassListWnd()
{
}
BEGIN_MESSAGE_MAP(CClassListWnd, CListCtrl)
//{{AFX_MSG_MAP(CClassListWnd)
ON_WM_HSCROLL()
ON_WM_VSCROLL()
ON_WM_ERASEBKGND()
ON_WM_PALETTECHANGED()
ON_WM_QUERYNEWPALETTE()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CClassListWnd message handlersBOOL CClassListWnd::SetBkImage(UINT nIDResource)
{
return SetBkImage((LPCTSTR)nIDResource);
}BOOL CClassListWnd::SetBkImage(LPCTSTR lpszResourceName)
{
// If this is not the first call then Delete GDI objects
if( m_bitmap.m_hObject != NULL ) m_bitmap.DeleteObject();
if( m_pal.m_hObject != NULL ) m_pal.DeleteObject();
HBITMAP hBmp = (HBITMAP)::LoadImage( AfxGetInstanceHandle(), lpszResourceName, IMAGE_BITMAP, 0,0, LR_CREATEDIBSECTION ); if( hBmp == NULL ) return FALSE; m_bitmap.Attach( hBmp );
BITMAP bm;
m_bitmap.GetBitmap( &bm );
m_cxBitmap = bm.bmWidth;
m_cyBitmap = bm.bmHeight; // Create a logical palette for the bitmap
DIBSECTION ds;
BITMAPINFOHEADER &bmInfo = ds.dsBmih;
m_bitmap.GetObject( sizeof(ds), &ds ); int nColors = bmInfo.biClrUsed ? bmInfo.biClrUsed : 1 << bmInfo.biBitCount; // Create a halftone palette if colors > 256.
CClientDC dc(NULL); // Desktop DC
if( nColors > 256 )
m_pal.CreateHalftonePalette( &dc );
else
{
// Create the palette RGBQUAD *pRGB = new RGBQUAD[nColors];
CDC memDC;
memDC.CreateCompatibleDC(&dc); memDC.SelectObject( &m_bitmap );
::GetDIBColorTable( memDC, 0, nColors, pRGB ); UINT nSize = sizeof(LOGPALETTE) + (sizeof(PALETTEENTRY) * nColors);
LOGPALETTE *pLP = (LOGPALETTE *) new BYTE[nSize]; pLP->palVersion = 0x300;
pLP->palNumEntries = nColors; for( int i=0; i < nColors; i++)
{
pLP->palPalEntry[i].peRed = pRGB[i].rgbRed;
pLP->palPalEntry[i].peGreen = pRGB[i].rgbGreen;
pLP->palPalEntry[i].peBlue = pRGB[i].rgbBlue;
pLP->palPalEntry[i].peFlags = 0;
} m_pal.CreatePalette( pLP ); delete[] pLP;
delete[] pRGB;
}
Invalidate(); return TRUE;
}void CClassListWnd::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
// TODO: Add your message handler code here and/or call default
if( m_bitmap.m_hObject != NULL ) InvalidateRect(NULL);
CListCtrl::OnHScroll(nSBCode, nPos, pScrollBar);
}void CClassListWnd::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
// TODO: Add your message handler code here and/or call default
if( m_bitmap.m_hObject != NULL ) InvalidateRect(NULL);
CListCtrl::OnVScroll(nSBCode, nPos, pScrollBar);
}BOOL CClassListWnd::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default
if( m_bitmap.m_hObject != NULL ) return TRUE;
return CListCtrl::OnEraseBkgnd(pDC);
}void CClassListWnd::OnPaletteChanged(CWnd* pFocusWnd)
{
CListCtrl::OnPaletteChanged(pFocusWnd);
// TODO: Add your message handler code here
if( pFocusWnd == this ) return; OnQueryNewPalette();
}BOOL CClassListWnd::OnQueryNewPalette()
{
// TODO: Add your message handler code here and/or call default
CClientDC dc(this);
if( dc.GetDeviceCaps(RASTERCAPS) & RC_PALETTE && m_pal.m_hObject != NULL )
{
dc.SelectPalette( &m_pal, FALSE );
BOOL result = dc.RealizePalette();
if( result ) Invalidate();
return result;
}
return CListCtrl::OnQueryNewPalette();
}void CClassListWnd::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{ CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
CRect rcItem(lpDrawItemStruct->rcItem);
int nItem = lpDrawItemStruct->itemID;
CImageList* pImageList; // Save dc state
int nSavedDC = pDC->SaveDC(); // Get item image and state info
LV_ITEM lvi;
lvi.mask = LVIF_IMAGE | LVIF_STATE;
lvi.iItem = nItem;
lvi.iSubItem = 0;
lvi.stateMask = 0xFFFF; // get all state flags
GetItem(&lvi); // Should the item be highlighted
BOOL bHighlight =((lvi.state & LVIS_DROPHILITED)||((lvi.state & LVIS_SELECTED)&&((GetFocus() == this)||
(GetStyle() & LVS_SHOWSELALWAYS)))); // Get rectangles for drawing
CRect rcBounds, rcLabel, rcIcon;
GetItemRect(nItem, rcBounds, LVIR_BOUNDS);
GetItemRect(nItem, rcLabel, LVIR_LABEL);
GetItemRect(nItem, rcIcon, LVIR_ICON);
CRect rcCol( rcBounds ); CString sLabel = GetItemText(nItem, 0 ); // Labels are offset by a certain amount
// This offset is related to the width of a space character
int offset = pDC->GetTextExtent(_T(" "), 1 ).cx*2; CRect rcHighlight;
CRect rcClient;
int nExt;
switch(m_nHighlight)
{
case 0:
nExt=pDC->GetOutputTextExtent(sLabel).cx + offset;
rcHighlight = rcLabel;
// if( rcLabel.left + nExt
if( m_bitmap.m_hObject != NULL )
{
CDC tempDC;
tempDC.CreateCompatibleDC(pDC);
tempDC.SelectObject( &m_bitmap ); GetClientRect(&rcClient); CRgn rgnBitmap;
CRect rcTmpBmp( rcItem );
rcTmpBmp.right = rcClient.right; // We also need to check whether it is the last item
// The update region has to be extended to the bottom if it is
if( nItem == GetItemCount() - 1 )
rcTmpBmp.bottom = rcClient.bottom; rgnBitmap.CreateRectRgnIndirect(&rcTmpBmp);
pDC->SelectClipRgn(&rgnBitmap);
rgnBitmap.DeleteObject();
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && m_pal.m_hObject != NULL )
{
pDC->SelectPalette( &m_pal, FALSE );
pDC->RealizePalette();
} CRect rcFirstItem;
GetItemRect(0, rcFirstItem, LVIR_BOUNDS); for (int i = rcFirstItem.left; i < rcTmpBmp.right; i += m_cxBitmap)
for (int j = rcFirstItem.top; j < rcTmpBmp.bottom; j += m_cyBitmap)
pDC->BitBlt(i, j, m_cxBitmap, m_cyBitmap, &tempDC, 0, 0, SRCCOPY); }
}
// Draw the background color
if( bHighlight )
{
pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));
pDC->SetBkColor(::GetSysColor(COLOR_HIGHLIGHT)); pDC->FillRect(rcHighlight, &CBrush(::GetSysColor(COLOR_HIGHLIGHT)));
}
else if( m_bitmap.m_hObject == NULL )
pDC->FillRect(rcHighlight, &CBrush(::GetSysColor(COLOR_WINDOW))); // Set clip region
rcCol.right = rcCol.left + GetColumnWidth(0);
CRgn rgn;
rgn.CreateRectRgnIndirect(&rcCol);
pDC->SelectClipRgn(&rgn);
rgn.DeleteObject(); // Draw state icon
if (lvi.state & LVIS_STATEIMAGEMASK)
{
int nImage = ((lvi.state & LVIS_STATEIMAGEMASK)>>12) - 1;
pImageList = GetImageList(LVSIL_STATE);
if (pImageList)
{
pImageList->Draw(pDC, nImage,
CPoint(rcCol.left, rcCol.top), ILD_TRANSPARENT);
}
}
// Draw normal and overlay icon
pImageList = GetImageList(LVSIL_SMALL);
if (pImageList)
{
UINT nOvlImageMask=lvi.state & LVIS_OVERLAYMASK;
pImageList->Draw(pDC, lvi.iImage,
CPoint(rcIcon.left, rcIcon.top),
(bHighlight?ILD_BLEND50:0) | ILD_TRANSPARENT | nOvlImageMask );
}
// Draw item label - Column 0
rcLabel.left += offset/2;
rcLabel.right -= offset; pDC->DrawText(sLabel,-1,rcLabel,DT_LEFT | DT_SINGLELINE | DT_NOPREFIX | DT_NOCLIP
| DT_VCENTER | DT_END_ELLIPSIS);
// Draw labels for remaining columns
LV_COLUMN lvc;
lvc.mask = LVCF_FMT | LVCF_WIDTH; if( m_nHighlight == 0 ) // Highlight only first column
{
pDC->SetTextColor(::GetSysColor(COLOR_WINDOWTEXT));
pDC->SetBkColor(::GetSysColor(COLOR_WINDOW));
}
rcBounds.right = rcHighlight.right > rcBounds.right ? rcHighlight.right :
rcBounds.right;
rgn.CreateRectRgnIndirect(&rcBounds);
pDC->SelectClipRgn(&rgn);
for(int nColumn = 1; GetColumn(nColumn, &lvc); nColumn++)
{
rcCol.left = rcCol.right;
rcCol.right += lvc.cx; // Draw the background if needed&& m_nHighlight == HIGHLIGHT_NORMAL
if( m_bitmap.m_hObject == NULL )
pDC->FillRect(rcCol, &CBrush(::GetSysColor(COLOR_WINDOW))); sLabel = GetItemText(nItem, nColumn);
if (sLabel.GetLength() == 0)
continue;
// Get the text justification
UINT nJustify = DT_LEFT;
switch(lvc.fmt & LVCFMT_JUSTIFYMASK)
{
case LVCFMT_RIGHT:
nJustify = DT_RIGHT;
break;
case LVCFMT_CENTER:
nJustify = DT_CENTER;
break;
default:
break;
} rcLabel = rcCol;
rcLabel.left += offset;
rcLabel.right -= offset; pDC->DrawText(sLabel, -1, rcLabel, nJustify | DT_SINGLELINE
| DT_NOPREFIX | DT_VCENTER | DT_END_ELLIPSIS);
} // Draw focus rectangle if item has focus
if (lvi.state & LVIS_FOCUSED && (GetFocus() == this))
pDC->DrawFocusRect(rcHighlight);
// Restore dc
pDC->RestoreDC( nSavedDC );}使用:
void CMy4_3Dlg::OnRadio1()
{
CClassListWnd m_cbmp;
m_cbmp.SetBkImage(IDB_BITMAP);
}