在对话框上有一个CListCtrl，我想把里面的内容打印出来，提点建议呢

[alphagx]

[alphagx]

在Document/View 中处理打印倒还算方便，在对话框中我有点迷茫了，

[prog_st]

Print the contents of the list control

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This code was contributed by Ravi Reddy.
I tried to use the Print code available in your site for List View Control. That was not good enough. The sample sends WM_PAINT message to itself after adjusting printer DC. The problem with this is this will only print currently visible items only and will not take care of Margins etc. It does not take care of number of pages etc also.

I wrote a slightly enhanced printing functionality here. This priting is divided into two main functions on the MFC line. OnBeginPrint and OnPrint as shiown in the following code. These will ideally be called form view OnFileBeginPrint and OnFilePrint functions.

I have a string list to take the header content. Each string in a string list will be painted in a separate row.

It has a DrawRow functions which will paint the row on screen (in case of Owner draw control fron OnDrawItem code) or on printer. As a matter of fact my CSapListControl has a lot of functionality like, full row selection, alternate color bands, TreeLike List controlwith expand and collpase features, virtaul function for Sorting, OnGetDispInfo etc. All these functions will be called depending on the flags set. For exaple it has OnDrawItem function, it will not be called if the Owner draw flag is set. All my list controls in my project are derived from this. I will send you all the code for this class, when I get some time to write description for all the functions.

All the members starting with m_ are class variables.


#define HEADER_HEIGHT 4
#define FOOTER_HEIGHT 3
#define LEFT_MARGIN 8
#define RIGHT_MARGIN 4

void CSAPListCtrl::OnBeginPrint(CDC *pDC, CPrintInfo *pInfo)
{
// OnBeginPrinting() is called after the user has committed to
// printing by OK'ing the Print dialog, and after the framework
// has created a CDC object for the printer or the preview view.

// This is the right opportunity to set up the page range.
// Given the CDC object, we can determine how many rows will
// fit on a page, so we can in turn determine how many printed
// pages represent the entire document.

if(NULL == pDC || NULL == pInfo)
return;

int nMaxRowCount = GetItemCount();
if(!nMaxRowCount)
return;

//let us do all dimesions in ListControl units (Device) rather than
//printer device units. Since we have more control on them
CDC *pCtlDC = GetDC();
if(NULL == pCtlDC)
return ;
TEXTMETRIC tm;
pCtlDC->GetTextMetrics(&tm);
m_nCharWidth = tm.tmAveCharWidth;

pDC->SetMapMode(MM_ANISOTROPIC);

CRect rc;
GetItemRect(0, &rc, LVIR_BOUNDS);
m_nRowHeight = rc.Height();

int nMargins = (LEFT_MARGIN+RIGHT_MARGIN)*m_nCharWidth;
//this will optimize the column widths. If we have more column than
//screen width and horizontal scroll on List control
//this will reduce the column widths proportonately to fit all of them
//on the page. If we have fewer column all the column
//widths will increased propertionately.
pDC->SetWindowExt(rc.Width() + nMargins, pCtlDC->GetDeviceCaps(LOGPIXELSX));

pDC->SetViewportExt(pDC->GetDeviceCaps(HORZRES),pDC->GetDeviceCaps(LOGPIXEL SX));
double d = (double)pDC->GetDeviceCaps(LOGPIXELSY)/(double)pCtlDC->GetDeviceCaps(LOGPIX ELSY);
ReleaseDC(pCtlDC);

nMargins = (int)(m_nRowHeight*d);
int nPageHeight = pDC->GetDeviceCaps(VERTRES);
m_nRowsPerPage = nPageHeight/nMargins; //nMargins reused
m_nRowsPerPage -= (HEADER_HEIGHT+FOOTER_HEIGHT);
m_nRowsPerPage -= 1; //adjustment for list control header
int nMaxPage = nMaxRowCount/m_nRowsPerPage + 1;
pInfo->SetMaxPage(nMaxPage);
pInfo->m_nCurPage = 1; // start printing at page# 1
}

void CSAPListCtrl::OnPrint(CDC *pDC, CPrintInfo *pInfo)
{
if(NULL == pDC || NULL == pInfo)
return;

// Draw as many rows as will fit on the printed page.
// Clip the printed page so that there is no partially shown
// row at the bottom of the page (the same row which will be fully
// shown at the top of the next page).
int nStartRow = 0;
int nEndRow = 0;
int nMaxRowCount = GetItemCount();

nStartRow = (pInfo->m_nCurPage - 1)*m_nRowsPerPage;
nEndRow = nStartRow+m_nRowsPerPage;
if(nEndRow > nMaxRowCount)
nEndRow = nMaxRowCount;

//create bold font for header and footer
CFont *pOldFont = NULL;
CFont BoldFont;
LOGFONT lf;
pOldFont = GetFont();;
pOldFont->GetLogFont(&lf);
lf.lfWeight = FW_BOLD;
BoldFont.CreateFontIndirect(&lf);

pOldFont = pDC->SelectObject(&BoldFont);
int nPrevBkMode = pDC->SetBkMode(TRANSPARENT);
//print the header
PrintHeader(pDC, pInfo);
//Print the footer
PrintFooter(pDC, pInfo);
pDC->SetBkMode(nPrevBkMode);
pDC->SelectObject(pOldFont);
BoldFont.DeleteObject();

//Set origin to print header and Header control. Keep Y position at 0 to
//print header information
//Change Y position of origin to print List control header
//Adjust the List control origin to start printing after page margins
pDC->SetWindowOrg(-1*(LEFT_MARGIN*m_nCharWidth), -1*HEADER_HEIGHT*m_nRowHeight);

//send a message to Header control to print itsef. There is little scope to improve printing header.
//I have m_HeaderCtrl in my class. If not take by HeaderCtrl = GetDlgItem(0);
m_HeaderCtrl.SendMessage(WM_PAINT, (WPARAM)pDC->m_hDC);

//Chage window position to take care of ListControl Horizontal scrolling.
//if List control is scrolled to left horizontally the above window origin
//will not start painting from first column, instead it starts painting from
//first visible column, because rcBounds etc are will have -ve left value
//Same thing with vertical scrolling also
CRect rcBounds;
GetItemRect(nStartRow, &rcBounds, LVIR_BOUNDS);

//offset top margin of rcBounds by ListControl header
CRect rc;
m_HeaderCtrl.GetClientRect(&rc);
rcBounds.OffsetRect(0, -rc.Height());
pDC->OffsetWindowOrg(rcBounds.left, rcBounds.top);
//start printing rows
for(int i = nStartRow; i < nEndRow; i++)
DrawRow(pDC, i);

//SetWindowOrg back for next page
pDC->SetWindowOrg(0,0);
return;
}

void CSAPListCtrl::PrintHeader(CDC *pDC, CPrintInfo *pInfo)
{
CRect rc(pInfo->m_rectDraw);
CString sTemp;

//Print App title
rc.left += LEFT_MARGIN*m_nCharWidth;
rc.right -= RIGHT_MARGIN*m_nCharWidth;
rc.bottom = rc.top+m_nRowHeight;

//print App title on top right margin
sTemp.LoadString(AFX_IDS_APP_TITLE);
pDC->DrawText(sTemp, &rc, DT_RIGHT | DT_SINGLELINE | DT_NOPREFIX | DT_VCENTER);

//print Header. One row for each string
POSITION pos = NULL;
pos = m_HeaderList.GetHeadPosition();
while(pos)
{
sTemp = m_HeaderList.GetNext(pos);
pDC->DrawText(sTemp, &rc, DT_LEFT | DT_SINGLELINE | DT_NOPREFIX | DT_VCENTER);
rc.OffsetRect(0, m_nRowHeight);
}
}

//print footer with a line and date, and page number
void CSAPListCtrl::PrintFooter(CDC *pDC, CPrintInfo *pInfo)
{
CRect rc(pInfo->m_rectDraw);

//draw line
rc.left += LEFT_MARGIN*m_nCharWidth;
rc.right -= RIGHT_MARGIN*m_nCharWidth;
rc.top = rc.bottom - FOOTER_HEIGHT*m_nRowHeight;
rc.bottom = rc.top + m_nRowHeight;
pDC->MoveTo(rc.left, rc.top);
pDC->LineTo(rc.right, rc.top);

//draw page number
CString sTemp ;
rc.OffsetRect(0, m_nRowHeight/2);
sTemp.Format(IDS_PRINT_PAGE_TITLE, pInfo->m_nCurPage);
pDC->DrawText(sTemp,-1,rc, DT_LEFT | DT_SINGLELINE | DT_NOPREFIX | DT_NOCLIP | DT_VCENTER);

CTime t = CTime::GetCurrentTime();
sTemp = t.Format("%c");
pDC->DrawText(sTemp,-1,rc, DT_RIGHT | DT_SINGLELINE | DT_NOPREFIX | DT_NOCLIP | DT_VCENTER);
}

//this is drawing code copied RowList sample and from www.codeguru.com site
int CSAPListCtrl::DrawRow(CDC *pDC, int nItem)
{
CImageList *pImageList = NULL;
CFont *pOldFont = NULL;
CFont BoldFont;
CString sLabel;
UINT dtFlags = DT_SINGLELINE|DT_NOPREFIX|DT_VCENTER;
int nSaveDC = pDC->SaveDC();

if(!pDC->IsPrinting())
dtFlags |= (DT_NOCLIP | DT_END_ELLIPSIS); //no clip because we add ellipsis at the end
// get item data
LV_ITEM lvi;
lvi.mask = LVIF_IMAGE | LVIF_STATE | LVIF_INDENT;
lvi.iItem=nItem;
lvi.iSubItem=0;
lvi.stateMask=0xFFFF; // get all state flags
GetItem(&lvi);

BOOL bHighlight = ((lvi.state & LVIS_DROPHILITED) || ((lvi.state & LVIS_SELECTED)
&& ((GetFocus() == this) || (GetStyle() & LVS_SHOWSELALWAYS))));

//Get rectangles for painting
CRect rcBounds, rcLabel, rcIcon;
GetItemRect(nItem, rcBounds, LVIR_BOUNDS);
GetItemRect(nItem, rcLabel, LVIR_LABEL);
GetItemRect(nItem, rcIcon, LVIR_ICON);
CRect rcCol(rcBounds);

CRect rcWnd;
sLabel = GetItemText(nItem, 0);
//Label offset
int offset = pDC->GetTextExtent(_T(" "), 1).cx;

CRect rcHighlight;
int nExt = 0;
switch(m_nHighlight)
{
case HIGHLIGHT_NORMAL:
nExt = pDC->GetOutputTextExtent(sLabel).cx + offset;
rcHighlight = rcLabel;
if(rcLabel.left + nExt < rcLabel.right)
rcHighlight.right = rcLabel.left + nExt;
break;

case HIGHLIGHT_ALLCOLUMNS:
rcHighlight = rcBounds;
rcHighlight.left = rcLabel.left;
break;

case HIGHLIGHT_ROW:
GetClientRect(&rcWnd);
rcHighlight = rcBounds;
rcHighlight.left = rcLabel.left;
rcHighlight.right = rcWnd.right;
break;

default:
rcHighlight.left = rcLabel.left;
break;
}

//draw highlight. printing may not be required
if(bHighlight)
{
pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));
pDC->SetBkColor(::GetSysColor(COLOR_HIGHLIGHT));
pDC->FillRect(rcHighlight, &CBrush(::GetSysColor(COLOR_HIGHLIGHT)));
}
else {
pDC->SetBkColor(::GetSysColor(COLOR_WINDOW));
pDC->FillRect(rcHighlight, &CBrush(::GetSysColor(COLOR_WINDOW)));
}

//set clip region
rcCol.right = rcCol.left + GetColumnWidth(0);

//Nice to have regions but they are not working on printer DC we may need
//to take get device caps to support regions. Does not seems to help much now
//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);
//offset the state image icon indent levels.
nExt = rcCol.left + lvi.iIndent*rcIcon.Width(); //nExt reused
if(pImageList)
pImageList->Draw(pDC, nImage, CPoint(nExt, rcCol.top), ILD_TRANSPARENT);
}

//Draw Normal and overlay icon
pImageList = GetImageList(LVSIL_SMALL); //assuming printing in report mode only
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);
}

//if state image mask is on and indent is 0 then consider it as Server row
if((lvi.state & LVIS_STATEIMAGEMASK) && !lvi.iIndent)
{
//create bold font
LOGFONT lf;
pOldFont = GetFont();;
pOldFont->GetLogFont(&lf);
lf.lfWeight = FW_BOLD;
BoldFont.CreateFontIndirect(&lf);
pOldFont = pDC->SelectObject(&BoldFont);
rcLabel.right = rcBounds.right; //draw server name to full row width
}

//Draw item label
rcLabel.left += offset/2;
rcLabel.right -= offset;
dtFlags |= DT_LEFT;
pDC->DrawText(sLabel, rcLabel, dtFlags);

if((lvi.state & LVIS_STATEIMAGEMASK) && !lvi.iIndent)
{
pOldFont = pDC->SelectObject(pOldFont);
BoldFont.DeleteObject();
//focus rect if required
if(lvi.state & LVIS_FOCUSED && (GetFocus() == this))
pDC->DrawFocusRect(rcHighlight);
pDC->RestoreDC(nSaveDC);
return 0;
}

//dRAW LABELS FOR REMAINING COLUMNS
LV_COLUMN lvc;
lvc.mask = LVCF_FMT|LVCF_WIDTH;

if(m_nHighlight == HIGHLIGHT_NORMAL)
{
pDC->SetTextColor(::GetSysColor(COLOR_WINDOWTEXT));
pDC->SetBkColor(::GetSysColor(COLOR_WINDOW));
}
rcBounds.right = rcHighlight.right > rcBounds.right ? rcHighlight.right:rcBounds.right;

//Nice to have regions but they are not working on printer DC we may need
//to take get device caps to support regions. Does not seems to help much now
//rgn.CreateRectRgnIndirect(&rcBounds);
//pDC->SelectClipRgn(&rgn);
//rgn.DeleteObject();

for(int nColumn = 1; GetColumn(nColumn, &lvc); nColumn++)
{
rcCol.left = rcCol.right;
rcCol.right += lvc.cx;

//draw background if needed
if(m_nHighlight == HIGHLIGHT_NORMAL)
pDC->FillRect(rcCol, &CBrush(::GetSysColor(COLOR_WINDOW)));

sLabel = GetItemText(nItem, nColumn);
if(sLabel.IsEmpty())
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;

dtFlags &= ~DT_RIGHT;
dtFlags &= ~DT_CENTER;
dtFlags |= nJustify;
pDC->DrawText(sLabel, -1, rcLabel, dtFlags);
}
//focus rect if required
if(lvi.state & LVIS_FOCUSED && (GetFocus() == this))
pDC->DrawFocusRect(rcHighlight);

pDC->RestoreDC(nSaveDC);
return 0;
}

void CSAPListCtrl::SetHeaderString(CStringList *HeaderList)
{
m_HeaderList.RemoveAll();
m_HeaderList.AddTail(HeaderList);
}

[dingo2000]

我的天啊，代码这么长