CClientDC appDC(pAppFrame); // All views but one should be a background palette. // wParam contains a handle to the active view, so the SelectPalette // bForceBackground flag is FALSE only if wParam == m_hWnd (this view) CPalette* oldPalette = appDC.SelectPalette(pPal,((HWND)wParam)!=m_hWnd); if (oldPalette != NULL) { UINT nColorsChanged = appDC.RealizePalette(); if (nColorsChanged > 0) { pDoc->UpdateAllViews(NULL); } appDC.SelectPalette(oldPalette, TRUE); } else { TRACE0("\tCCh1_1View::OnPaletteChanged中调用SelectPalette()失败!\n"); } }
#include "DIBDisplay.h"#include "DIBDisplayDoc.h"
#include "DIBDisplayView.h"
#include "mainfrm.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// CDIBDisplayViewIMPLEMENT_DYNCREATE(CDIBDisplayView, CScrollView)BEGIN_MESSAGE_MAP(CDIBDisplayView, CScrollView)
//{{AFX_MSG_MAP(CDIBDisplayView)
ON_WM_ERASEBKGND()
ON_COMMAND(ID_EDIT_COPY, OnEditCopy)
ON_UPDATE_COMMAND_UI(ID_EDIT_COPY, OnUpdateEditCopy)
ON_COMMAND(ID_EDIT_PASTE, OnEditPaste)
ON_UPDATE_COMMAND_UI(ID_EDIT_PASTE, OnUpdateEditPaste)
//}}AFX_MSG_MAP
// Standard printing commands
ON_COMMAND(ID_FILE_PRINT, CScrollView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_DIRECT, CScrollView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_PREVIEW, CScrollView::OnFilePrintPreview)
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CDIBDisplayView construction/destructionCDIBDisplayView::CDIBDisplayView()
{
// TODO: add construction code here}CDIBDisplayView::~CDIBDisplayView()
{
}BOOL CDIBDisplayView::PreCreateWindow(CREATESTRUCT& cs)
{
// TODO: Modify the Window class or styles here by modifying
// the CREATESTRUCT cs return CScrollView::PreCreateWindow(cs);
}/////////////////////////////////////////////////////////////////////////////
// CDIBDisplayView drawingvoid CDIBDisplayView::OnDraw(CDC* pDC)
{
BeginWaitCursor(); CDIBDisplayDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc); HDIB hDIB = pDoc->GetHDIB();
if (hDIB != NULL)
{
LPSTR lpDIB = (LPSTR) ::GlobalLock((HGLOBAL) hDIB);
int cxDIB = (int) pDoc->GetDibImage()->DIBWidth(lpDIB);
int cyDIB = (int) pDoc->GetDibImage()->DIBHeight(lpDIB); ::GlobalUnlock((HGLOBAL) hDIB);
CRect rcDIB;
rcDIB.top = rcDIB.left = 0;
rcDIB.right = cxDIB;
rcDIB.bottom = cyDIB;
CRect rcDest;
if (pDC->IsPrinting())
{
// 是打印,计算输出图像的位置和大小,以便符合页面
// 获取打印页面的水平宽度(象素)
int cxPage = pDC->GetDeviceCaps(HORZRES);
// 获取打印页面的垂直高度(象素)
int cyPage = pDC->GetDeviceCaps(VERTRES);
// 获取打印机每英寸象素数
int cxInch = pDC->GetDeviceCaps(LOGPIXELSX);
int cyInch = pDC->GetDeviceCaps(LOGPIXELSY);
// 计算打印图像大小(缩放,根据页面宽度调整图像大小)
rcDest.top = rcDest.left = 0;
rcDest.bottom = (int)(((double)cyDIB * cxPage * cyInch)
/ ((double)cxDIB * cxInch));
rcDest.right = cxPage;
// 计算打印图像位置(垂直居中)
int temp = cyPage - (rcDest.bottom - rcDest.top);
rcDest.bottom += temp/2;
rcDest.top += temp/2;
}
else
{
// 不必缩放图像
rcDest = rcDIB;
}
pDoc->GetDibImage()->PaintDIB(pDC->m_hDC, &rcDest, pDoc->GetHDIB(),
&rcDIB, pDoc->GetDocPalette());
}
EndWaitCursor();
}void CDIBDisplayView::OnInitialUpdate()
{
CScrollView::OnInitialUpdate(); // TODO: calculate the total size of this view}/////////////////////////////////////////////////////////////////////////////
// CDIBDisplayView printingBOOL CDIBDisplayView::OnPreparePrinting(CPrintInfo* pInfo)
{
// 设置总页数为一。
pInfo->SetMaxPage(1); return DoPreparePrinting(pInfo);
}void CDIBDisplayView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
// TODO: add extra initialization before printing
}void CDIBDisplayView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
// TODO: add cleanup after printing
}/////////////////////////////////////////////////////////////////////////////
// CDIBDisplayView diagnostics#ifdef _DEBUG
void CDIBDisplayView::AssertValid() const
{
CScrollView::AssertValid();
}void CDIBDisplayView::Dump(CDumpContext& dc) const
{
CScrollView::Dump(dc);
}CDIBDisplayDoc* CDIBDisplayView::GetDocument() // non-debug version is inline
{
ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CDIBDisplayDoc)));
return (CDIBDisplayDoc*)m_pDocument;
}
#endif //_DEBUG/////////////////////////////////////////////////////////////////////////////
// CDIBDisplayView message handlersBOOL CDIBDisplayView::OnEraseBkgnd(CDC* pDC)
{
// 主要是为了设置子窗体默认的背景色
// 背景色由文档成员变量m_refColorBKG指定 CDIBDisplayDoc* pDoc = GetDocument();
CBrush brush(pDoc->m_refColorBKG);
CBrush* pOldBrush = pDC->SelectObject(&brush);
CRect rectClip;
pDC->GetClipBox(&rectClip); // 获取重绘区域
pDC->PatBlt(rectClip.left, rectClip.top, rectClip.Width(),
rectClip.Height(), PATCOPY); pDC->SelectObject(pOldBrush); return TRUE;
}void CDIBDisplayView::OnEditCopy()
{
// 复制当前图像 CDIBDisplayDoc* pDoc = GetDocument();
if (OpenClipboard())
{
BeginWaitCursor();
EmptyClipboard();
// 复制当前图像到剪贴板
SetClipboardData (CF_DIB, pDoc->GetDibImage()->
CopyHandle((HANDLE) pDoc->GetHDIB()) ); CloseClipboard();
EndWaitCursor();
}
}void CDIBDisplayView::OnUpdateEditCopy(CCmdUI* pCmdUI)
{
// 如果当前DIB对象不空,复制菜单项有效
pCmdUI->Enable(GetDocument()->GetHDIB() != NULL);
}void CDIBDisplayView::OnEditPaste()
{
// 粘贴图像
HDIB hNewDIB = NULL;
CDIBDisplayDoc* pDoc = GetDocument();
if (OpenClipboard())
{
BeginWaitCursor(); // 读取剪贴板中的图像
hNewDIB = (HDIB)pDoc->GetDibImage()->CopyHandle(::GetClipboardData(CF_DIB)); CloseClipboard();
if (hNewDIB != NULL)
{
pDoc->ReplaceHDIB(hNewDIB); // 替换DIB,同时释放旧DIB对象
pDoc->InitDIBData(); // 更新DIB大小和调色板
pDoc->SetModifiedFlag(TRUE); // 设置脏标记
SetScrollSizes(MM_TEXT, pDoc->GetDocSize()); // 重新设置滚动视图大小
OnDoRealize((WPARAM)m_hWnd,0); // 实现新的调色板
pDoc->UpdateAllViews(NULL); // 更新视图
} EndWaitCursor();
}
}void CDIBDisplayView::OnUpdateEditPaste(CCmdUI* pCmdUI)
{
// 如果当前剪贴板中有DIB对象,粘贴菜单项有效
pCmdUI->Enable(::IsClipboardFormatAvailable(CF_DIB));
}LRESULT CDIBDisplayView::OnDoRealize(WPARAM wParam, LPARAM)
{
ASSERT(wParam != NULL); CDIBDisplayDoc* pDoc = GetDocument();
if (pDoc->GetHDIB() == NULL)
{
return 0L;
}
CPalette* pPal = pDoc->GetDocPalette();
if (pPal != NULL)
{
CMainFrame* pAppFrame = (CMainFrame*) AfxGetApp()->m_pMainWnd;
ASSERT_KINDOF(CMainFrame, pAppFrame);
CClientDC appDC(pAppFrame); // All views but one should be a background palette.
// wParam contains a handle to the active view, so the SelectPalette
// bForceBackground flag is FALSE only if wParam == m_hWnd (this view)
CPalette* oldPalette = appDC.SelectPalette(pPal,((HWND)wParam)!=m_hWnd);
if (oldPalette != NULL)
{
UINT nColorsChanged = appDC.RealizePalette();
if (nColorsChanged > 0)
{
pDoc->UpdateAllViews(NULL);
}
appDC.SelectPalette(oldPalette, TRUE);
}
else
{
TRACE0("\tCCh1_1View::OnPaletteChanged中调用SelectPalette()失败!\n");
}
}
return 0L;
}void CDIBDisplayView::OnActivateView(BOOL bActivate, CView* pActivateView, CView* pDeactiveView)
{
CScrollView::OnActivateView(bActivate, pActivateView, pDeactiveView); if (bActivate)
{
ASSERT(pActivateView == this);
OnDoRealize((WPARAM)m_hWnd, 0); // same as SendMessage(WM_DOREALIZE);
}
}void CDIBDisplayView::CalcWindowRect(LPRECT lpClientRect, UINT nAdjustType)
{
CScrollView::OnInitialUpdate();
ASSERT(GetDocument() != NULL);
SetScrollSizes(MM_TEXT, GetDocument()->GetDocSize());
}
Grapgic Divice Interface