rowview.cpp

中文信息处理方面的一个源码。此为一个拼音分析和生成软件功能强大

// rowview.cpp : implementation of the CRowView class (MM_TEXT)
//

#include "stdafx.h"
#include "resource.h" // for IDS_TOO_MANY_ROWS
#include "rowview.h"
#include <limits.h> // for SHRT_MAX, LONG_MAX

//#define WINDOWSNT // for unlimited rows

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

IMPLEMENT_DYNAMIC(CRowView, CScrollView)

/////////////////////////////////////////////////////////////////////////////
// CRowView

BEGIN_MESSAGE_MAP(CRowView, CScrollView)
    //{{AFX_MSG_MAP(CRowView)
    ON_WM_KEYDOWN()
    ON_WM_SIZE()
    ON_WM_LBUTTONDOWN()
    //}}AFX_MSG_MAP
    // Standard printing commands
    ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
    ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRowView construction, initialization, and destruction

CRowView::CRowView()
{
    m_nPrevSelectedRow = 0;
}

CRowView::~CRowView()
{
}

/////////////////////////////////////////////////////////////////////////////
// CRowView updating and drawing

void CRowView::OnInitialUpdate()
{
    m_nPrevRowCount = GetRowCount();
    m_nPrevSelectedRow = GetActiveRow();
    OnUpdate(this, 0, NULL);
}

/////////////////////////////////////////////////////////////////////////////
void CRowView::UpdateRow(int nInvalidRow)
{
    int nRowCount = GetRowCount();
    // If the number of rows has changed, adjust the scrolling range.
    if (nRowCount != m_nPrevRowCount) {
        UpdateScrollSizes();
        m_nPrevRowCount = nRowCount;
    }

    // When the currently selected row changes,
    //  scroll the view so that the newly selected row is visible, and
    //  ask the derived class to repaint the selected and previously
    //  selected rows.

    CClientDC dc(this);
    OnPrepareDC(&dc);

    // Determine the range of the rows that are currently fully visible
    //  in the window.  We want to do discrete scrolling by so that
    //  the next or previous row is always fully visible.

    int   nFirstRow, nLastRow;
    CRect rectClient;

    GetClientRect(&rectClient);
    dc.DPtoLP(&rectClient);
    RectLPtoRowRange(rectClient, nFirstRow, nLastRow, FALSE);

    // If necessary, scroll the window so that the newly selected row is
    //  visible.

    CPoint pt = GetDeviceScrollPosition();
    BOOL   bNeedToScroll = TRUE;

    if (nInvalidRow < nFirstRow) {
        // The newly selected row is above those currently visible
        //  in the window. Scroll so that the newly selected row is at the
        //  very top of the window.  The last row in the window might
        //  be only partially visible.
        pt.y = RowToYPos(nInvalidRow);
    }
    else if (nInvalidRow > nLastRow){
        // The newly selected row is below those currently visible
        //  in the window.  Scroll so that the newly selected row is at the
        //  very bottom of the window.  The first row in the window might
        //  be only partially visible.
        pt.y = max(0, RowToYPos(nInvalidRow+1) - rectClient.Height());
    }
    else {
        bNeedToScroll = FALSE;
    }
    if (bNeedToScroll) {
        ScrollToDevicePosition(pt);
        // Scrolling will cause the newly selected row to be
        //  redrawn in the invalidated area of the window.

        OnPrepareDC(&dc);  // Need to prepare the DC again because
            // ScrollToDevicePosition() will have changed the viewport
            //  origin.  The DC is used some more below.
    }

    CRect rectInvalid = RowToWndRect(&dc, nInvalidRow);
    InvalidateRect(&rectInvalid);

    // Give the derived class an opportunity to repaint the
    //  previously selected row, perhaps to un-highlight it.

    int nSelectedRow = GetActiveRow();
    if (m_nPrevSelectedRow != nSelectedRow) {
        CRect rectOldSelection = RowToWndRect(&dc, m_nPrevSelectedRow);
        InvalidateRect(&rectOldSelection);
        m_nPrevSelectedRow = nSelectedRow;
    }
}

/////////////////////////////////////////////////////////////////////////////
void CRowView::UpdateScrollSizes()
{
    // UpdateScrollSizes() is called when it is necessary to adjust the
    //  scrolling range or page/line sizes. There are two occassions
    //  where this is necessary: (1) when a new row is added--see
    //  UpdateRow()--and (2) when the window size changes--see OnSize().

    CRect rectClient;
    GetClientRect(&rectClient);

    CClientDC dc(this);
    CalculateRowMetrics(&dc);

    // The vert scrolling range is the total display height of all
    //  of the rows.
    CSize sizeTotal(m_nRowWidth, m_nRowHeight *
                   (min(GetRowCount(), LastViewableRow())));

    // The vertical per-page scrolling distance is equal to
    //  how many rows can be displayed in the current window, less
    //  one row for paging overlap.
    CSize sizePage(m_nRowWidth / 5, max(m_nRowHeight,
                ((rectClient.bottom / m_nRowHeight) - 1) * m_nRowHeight));

    // The vertical per-line scrolling distance is equal to the
    //  height of the row.
    CSize sizeLine(m_nRowWidth / 20, m_nRowHeight);

    SetScrollSizes(MM_TEXT, sizeTotal, sizePage, sizeLine);
}


/////////////////////////////////////////////////////////////////////////////
void CRowView::OnDraw(CDC* pDC)
{
    if (GetRowCount() == 0) {
        return;
    }
    // The window has been invalidated and needs to be repainted,
    //  or a page needs to be printed (or previewed).
    // First, determine the range of rows that need to be displayed or
    //  printed.

    int   nFirstRow, nLastRow;
    CRect rectClip;
    pDC->GetClipBox(&rectClip); // Get the invalidated region.
    RectLPtoRowRange(rectClip, nFirstRow, nLastRow, TRUE);

    // Draw each row in the invalidated region of the window,
    //  or on the printed (previewed) page.

    int nActiveRow = GetActiveRow();
    int nRow, y;
    int nLastViewableRow = LastViewableRow();

    for (nRow = nFirstRow,  y = m_nRowHeight * nFirstRow;
            nRow <= nLastRow; nRow++, y += m_nRowHeight) {
        if (nRow >= (nLastViewableRow - 1)) {
            CString strWarning;
            strWarning.LoadString(IDS_TOO_MANY_ROWS);
            pDC->TextOut(0, y, strWarning);
            break;
        }
        // Prepare for highlighting or un-highlighting the row, depending
        //  on whether it is the currently selected row or not. And
        //  paint the background (behind the text) accordingly.
        CBrush brushBackground;
        COLORREF crOldText, crOldBackground;
        if (!pDC->IsPrinting()) {
            if (nRow == nActiveRow) {
                brushBackground.CreateSolidBrush(::GetSysColor(COLOR_HIGHLIGHT));
                crOldBackground = pDC->SetBkColor(::GetSysColor(COLOR_HIGHLIGHT));
                crOldText = pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));
            }
            else {
                brushBackground.CreateSolidBrush(::GetSysColor(COLOR_WINDOW));
            }

            CRect rectSelection;
            pDC->GetClipBox(&rectSelection);
            rectSelection.top = y;
            rectSelection.bottom = y + m_nRowHeight;
            pDC->FillRect(&rectSelection, &brushBackground);
        }
        OnDrawRow(pDC, nRow, y, nRow == nActiveRow);
        // Restore the DC. (MOVED FROM DERIVED CLASS)
        if (!pDC->IsPrinting() && (nRow == nActiveRow)) {
            pDC->SetBkColor(crOldBackground);
            pDC->SetTextColor(crOldText);
        }
    }
}

/////////////////////////////////////////////////////////////////////////////
// Implementation

int CRowView::RowToYPos(int nRow)
{
    return (nRow * m_nRowHeight);
}

/////////////////////////////////////////////////////////////////////////////
CRect CRowView::RowToWndRect(CDC* pDC, int nRow)
{
    CRect clientRect;

    GetClientRect(clientRect);
    pDC->DPtoLP(clientRect);
    CRect rect(clientRect.left, nRow * m_nRowHeight,
               clientRect.right, (nRow + 1) * m_nRowHeight);
    pDC->LPtoDP(&rect);
    return rect;
}

/////////////////////////////////////////////////////////////////////////////
int CRowView::LastViewableRow()
{
#ifdef WINDOWSNT
    return LONG_MAX / m_nRowHeight - 1;
#else
    return SHRT_MAX / m_nRowHeight - 1;
#endif
}

/////////////////////////////////////////////////////////////////////////////
void CRowView::RectLPtoRowRange(const CRect& rect, int& nFirstRow,
                                int& nLastRow,
                                BOOL bIncludePartiallyShownRows)
{
    int nRounding = bIncludePartiallyShownRows ? 0 : (m_nRowHeight - 1);
    nFirstRow = (rect.top + nRounding) / m_nRowHeight;
    nLastRow = min((rect.bottom - nRounding) / m_nRowHeight,
                   GetRowCount() - 1);
}

/////////////////////////////////////////////////////////////////////////////
void CRowView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo)
{
    // The size of text that is displayed, printed, or previewed changes
    //  depending on the DC.  We explicitly call OnPrepareDC() to prepare
    //  CClientDC objects used for calculating text positions and to
    //  prepare the text metric member variables of the CRowView object.
    //  The application framework also calls OnPrepareDC() before passing
    //  the DC to OnDraw().

    CScrollView::OnPrepareDC(pDC, pInfo);
    CalculateRowMetrics(pDC);
}

/////////////////////////////////////////////////////////////////////////////
// Overrides of CView for implementing printing.

BOOL CRowView::OnPreparePrinting(CPrintInfo* pInfo)
{
    return DoPreparePrinting(pInfo);
}

/////////////////////////////////////////////////////////////////////////////
void CRowView::OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo)
{
    // OnBeginPrinting() is called after the user has committed to
    //  printing by OK'ing the Print dialog, and after the application
    //  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.

    int nPageHeight = pDC->GetDeviceCaps(VERTRES);
    CalculateRowMetrics(pDC);
    m_nRowsPerPrintedPage = nPageHeight / m_nRowHeight;
    int nPrintableRowCount = LastViewableRow() + 1;
    if (GetRowCount() < nPrintableRowCount) {
        nPrintableRowCount = GetRowCount();
    }
    pInfo->SetMaxPage((nPrintableRowCount + m_nRowsPerPrintedPage - 1)
        / m_nRowsPerPrintedPage);
    pInfo->m_nCurPage = 1;  // start previewing at page# 1
}

/////////////////////////////////////////////////////////////////////////////
void CRowView::OnPrint(CDC* pDC, CPrintInfo* pInfo)
{
    // Print the rows for the current page.

    int yTopOfPage = (pInfo->m_nCurPage -1) * m_nRowsPerPrintedPage
                     * m_nRowHeight;

    // Orient the viewport so that the first row to be printed
    //  has a viewport coordinate of (0,0).
    pDC->SetViewportOrg(0, -yTopOfPage);

    // 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 that will be fully
    //  shown at the top of the next page).

    int nPageWidth = pDC->GetDeviceCaps(HORZRES);

    CRect rectClip = CRect(0, yTopOfPage, nPageWidth, 
         yTopOfPage + m_nRowsPerPrintedPage * m_nRowHeight);
    pDC->IntersectClipRect(&rectClip);
    OnDraw(pDC);
}

/////////////////////////////////////////////////////////////////////////////
// CRowView commands


void CRowView::OnSize(UINT nType, int cx, int cy)
{
    UpdateScrollSizes();
    CScrollView::OnSize(nType, cx, cy);
}

/////////////////////////////////////////////////////////////////////////////
void CRowView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
//  int nMin, nMax, nPos;
    CRect clientRect;

    GetClientRect(clientRect);
    CClientDC dc(this);
    dc.DPtoLP(clientRect);
    
    switch (nChar)
    {
        case VK_HOME:
            ChangeSelectionToRow(0);
            break;
        case VK_END:
            ChangeSelectionToRow(min(GetRowCount() - 1,
                                 LastViewableRow() - 2));
            break;
        case VK_UP:
            ChangeSelectionNextRow(FALSE);
            break;
        case VK_DOWN:
            ChangeSelectionNextRow(TRUE);
            break;
        case VK_LEFT:
            if (clientRect.Width() < GetTotalSize().cx) {
			      OnHScroll(SB_LINELEFT, 0, NULL);
            }
            break;
        case VK_RIGHT:
            if (clientRect.Width() < GetTotalSize().cx) {
			      OnHScroll(SB_LINERIGHT, 0, NULL);
            }
            break;
        case VK_PRIOR:
            if (clientRect.Height() < GetTotalSize().cy) {
			      OnVScroll(SB_PAGEUP, 0, NULL);
            }
            break;
        case VK_NEXT:
            if (clientRect.Height() < GetTotalSize().cy) {
			      OnVScroll(SB_PAGEDOWN, 0, NULL);
            }
            break;
        default:
            CScrollView::OnKeyDown(nChar, nRepCnt, nFlags);
    }
}

/////////////////////////////////////////////////////////////////////////////
void CRowView::OnLButtonDown(UINT, CPoint point)
{
    CClientDC dc(this);
    OnPrepareDC(&dc);
    dc.DPtoLP(&point);

    CRect rect(point, CSize(1,1));
    int   nFirstRow, nLastRow;

    RectLPtoRowRange(rect, nFirstRow, nLastRow, TRUE);
    if (nFirstRow <= (GetRowCount() - 1)) {
        ChangeSelectionToRow(nFirstRow);
    }
}