able/windows-nt
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity
windows-nt/Source/XPSP1/NT/termsrv/admtools/winutils/tscfg/rowview.cpp

1075 lines
29 KiB
C++
Raw Permalink Normal View History

Add source files
2020-09-26 03:20:57 -05:00
/*******************************************************************************
*
* rowview.cpp
*
* implementation of the CRowView class and CRowViewHeaderBar class
*
* Modified from the Microsoft Foundation Classes C++ library.
* Copyright (C) 1992 Microsoft Corporation
* All rights reserved.
*
* additional copyright notice: Copyright 1995, Citrix Systems Inc.
*
* $Author: butchd $ Butch Davis
*
* $Log: N:\NT\PRIVATE\UTILS\CITRIX\WINUTILS\COMMON\VCS\ROWVIEW.CPP $
*
* Rev 1.1 18 Jul 1995 06:50:06 butchd
* Scrolling fix for Windows95 / MFC 3.0
*
* Rev 1.0 01 Mar 1995 10:54:46 butchd
* Initial revision.
*
* Rev 1.0 02 Aug 1994 18:18:30 butchd
* (Initial revision: was duplicated in each app directory).
*
*******************************************************************************/
/*
* include files
*/
#include "stdafx.h"
#include <afxwin.h> // MFC core and standard components
#include <afxext.h> // MFC extensions
#include "rowview.h"
#include "resource.h"
#include <stdlib.h>
#include <limits.h> // for INT_MAX
#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif
////////////////////////////////////////////////////////////////////////////////
// CRowViewHeaderBar class implementation / construction, destruction
IMPLEMENT_DYNAMIC(CRowViewHeaderBar, CStatusBar)
CRowViewHeaderBar::CRowViewHeaderBar()
{
}
CRowViewHeaderBar::~CRowViewHeaderBar()
{
}
/*******************************************************************************
*
* DoPaint - CRowViewHeaderBar member function: CStatusBar class override
*
* Draw the view's header bar.
*
* ENTRY:
*
* pDC (input)
* Points to the current CDC device-context object for drawing
* the header bar.
*
* NOTE: The view's
* DoPaint function.
*
******************************************************************************/
void
CRowViewHeaderBar::DoPaint( CDC* pDC )
{
/*
* Perform the CControlBar base class' DoPaint first.
*/
CControlBar::DoPaint(pDC);
/*
* Default the y position for drawing the header bar to the m_cyTopBorder
* member variable setting and call the view's OnDrawHeaderBar() member
* function to perform the desired header bar drawing.
*/
int y = m_cyTopBorder;
((CRowView *)m_pView)->OnDrawHeaderBar( pDC, y );
} // end CRowViewHeaderBar::DoPaint
////////////////////////////////////////////////////////////////////////////////
// CRowViewHeaderBar message map
BEGIN_MESSAGE_MAP(CRowViewHeaderBar, CStatusBar)
//{{AFX_MSG_MAP(CRowViewHeaderBar)
#if _MFC_VER >= 0x400
ON_WM_PAINT()
#endif
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
////////////////////////////////////////////////////////////////////////////////
// CRowViewHeaderBar commands
////////////////////////////////////////////////////////////////////////////////
// CRowView implementation / construction, destruction
IMPLEMENT_DYNAMIC(CRowView, CScrollView)
CRowView::CRowView()
{
m_nPrevSelectedRow = 0;
m_bThumbTrack = TRUE; // default to handle SB_THUMBTRACK messages.
m_pHeaderBar = NULL; // default to no header bar
}
CRowView::~CRowView()
{
}
int
CRowView::OnCreate( LPCREATESTRUCT lpCreateStruct )
{
if ( CScrollView::OnCreate(lpCreateStruct) == -1 )
return -1;
/*
* If the derived class has constructed a header bar, call CreateHeaderBar
* to create the header-bar window and initialize.
*/
if ( m_pHeaderBar )
if ( !CreateHeaderBar() )
return( -1 );
return( 0 );
} // end CRowView::OnCreate
BOOL
CRowView::CreateHeaderBar()
{
/*
* Invoke the CRowViewHeaderBar's Create member function (CStatusBar defined)
* to create the header bar, which will be hooked to this document/view's
* parent window. Set the header bar's m_pView pointer to this view.
*/
if ( !m_pHeaderBar->Create( GetParent(), WS_CHILD | WS_VISIBLE | CBRS_TOP,
IDW_HEADER_BAR ) ) {
return ( FALSE );
} else {
m_pHeaderBar->m_pView = this;
return ( TRUE );
}
} // end CRowView::CreateHeaderBar
////////////////////////////////////////////////////////////////////////////////
// CRowView class optional derived class override
/*******************************************************************************
*
* ResetHeaderBar - CRowView member function: optional derived class override
*
* Reset the header bar width and height based on the view's total width
* and view's row height. Will also instruct the parent frame to
* recalculate it's layout based on the new header bar metrics.
*
* NOTE: A derived class will typically override this member function to
* set the desired header bar font, then call this function.
*
******************************************************************************/
void
CRowView::ResetHeaderBar()
{
/*
* If no header bar was created, return.
*/
if ( !m_pHeaderBar )
return;
/*
* Set the header bar's width and height.
*/
m_pHeaderBar->SendMessage( WM_SIZE, 0, MAKELONG(m_nRowWidth, m_nRowHeight) );
/*
* Recalculate parent frame's layout with new header bar.
*/
((CFrameWnd *)m_pHeaderBar->GetParent())->RecalcLayout();
} // end CRowView::ResetHeaderBar
////////////////////////////////////////////////////////////////////////////////
// CRowView class override member functions
/*******************************************************************************
*
* OnInitialUpdate - CRowView member function: CView class override
*
* Called before the view is initially displayed.
*
* (Refer to the MFC CView::OnInitialUpdate documentation)
*
******************************************************************************/
void
CRowView::OnInitialUpdate()
{
m_nPrevRowCount = GetRowCount();
m_nPrevSelectedRow = GetActiveRow();
} // end CRowView::OnInitialUpdate
/*******************************************************************************
*
* OnPrepareDC - CRowView member function: CView class override
*
* Prepare the DC for screen or printer output.
*
* (Refer to the MFC CView::OnPrepareDC documentation)
*
******************************************************************************/
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 framework also calls OnPrepareDC() before passing the DC to
* OnDraw().
*/
CScrollView::OnPrepareDC( pDC, pInfo );
CalculateRowMetrics( pDC );
} // end CRowView::OnPrepareDC
/*******************************************************************************
*
* OnDraw - CRowView member function: CView class override
*
* Draw on the view as needed.
*
* (Refer to the MFC CView::OnDraw documentation)
*
******************************************************************************/
void
CRowView::OnDraw( CDC* pDC )
{
/*
* If there are no rows to draw, don't do anything.
*/
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 by fetching the invalidated region.
*/
int nFirstRow, nLastRow;
CRect rectClip;
pDC->GetClipBox( &rectClip );
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 ) {
CString strWarning;
strWarning.LoadString( IDS_TOO_MANY_ROWS );
pDC->TextOut( 0, y, strWarning );
break;
}
OnDrawRow( pDC, nRow, y, nRow == nActiveRow );
}
} // end CRowView::OnDraw
/*******************************************************************************
*
* OnPreparePrinting - CRowView member function: CView class override
*
* Prepare the view for printing or print preview.
*
* (Refer to the MFC CView::OnPreparePrinting documentation)
*
******************************************************************************/
BOOL
CRowView::OnPreparePrinting( CPrintInfo* pInfo )
{
return ( DoPreparePrinting( pInfo ) );
} // end CRowView::OnPreparePrinting
/*******************************************************************************
*
* OnBeginPrinting - CRowView member function: CView class override
*
* Setup before beginning to print.
*
* (Refer to the MFC CView::OnBeginPrinting documentation)
*
******************************************************************************/
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 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 );
/*
* Start previewing at page #1.
*/
pInfo->m_nCurPage = 1;
} // end CRowView::OnBeginPrinting
/*******************************************************************************
*
* OnPrint - CRowView member function: CView class override
*
* Print or preview a page of the view's document.
*
* (Refer to the MFC CView::OnPrint documentation)
*
******************************************************************************/
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 which 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);
} // end CRowView::OnPrint
/////////////////////////////////////////////////////////////////////////////
// CRowView operations
/*******************************************************************************
*
* UpdateRow - CRowView member function: operation
*
* Handle scrolling and invalidation of the specified row, in preparation
* for the OnDraw function.
*
* ENTRY:
*
* nInvalidRow (input)
* Row to update.
*
* EXIT:
*
******************************************************************************/
void
CRowView::UpdateRow( int nInvalidRow )
{
int nRowCount = GetRowCount();
/*
* If the number of rows has changed, then 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 the newly selected row is
* visible. MODIFICATION: set the pt.x to the left visible x point
* in the row (not 0), so that the ScrollToDevicePosition() call won't
* automatically perform a horizontal scroll (very annoying to user).
*/
POINT pt;
pt.x = rectClient.left;
BOOL bNeedToScroll = TRUE;
if ( nInvalidRow < nFirstRow ) {
/*
* The newly selected row is above those currently visible
* in the window. Scroll so 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 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 ) {
/*
* Scrolling will cause the newly selected row to be
* redrawn in the invalidated area of the window.
*/
ScrollToDevicePosition(pt);
/*
* Need to prepare the DC again because ScrollToDevicePosition()
* will have changed the viewport origin. The DC is used some
* more below.
*/
OnPrepareDC(&dc);
}
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;
}
} // end CRowView::UpdateRow
/*******************************************************************************
*
* IsScrollingNeeded - CRowView member function: operation
*
* Determine if the client window of this view is small enough in a
* HORIZONTAL or VERTICAL direction to require scrolling to see the
* entire view. This function is mainly used to support the operation
* of 'scrolling keys' (non-mouse generated scrolling commands).
*
* ENTRY:
*
* nBar (input)
* SB_HORZ or SB_VERT: to indicate which scrolling direction to check.
*
* EXIT:
*
* TRUE if scrolling is needed in the specified direction.
* FALSE if no scrolling is needed in the specified direction.
*
******************************************************************************/
BOOL
CRowView::IsScrollingNeeded( int nBar )
{
CRect rectClient;
CSize sizeTotal;
GetClientRect( &rectClient );
sizeTotal = GetTotalSize();
if ( nBar == SB_HORZ ) {
if ( sizeTotal.cx > rectClient.right )
return ( TRUE );
else
return (FALSE );
} else {
if ( sizeTotal.cy > rectClient.bottom )
return ( TRUE );
else
return (FALSE );
}
} // end CRowView::IsScrollingNeeded
#ifndef MFC300
/*******************************************************************************
*
* GetScrollLimit - CRowView member function: operation (MFC 2.x stub)
*
* MFC 3.0 provides a GetScrollLimit() member function that properly
* handles Windows95 scrollbar controls if running on Windows95. This
* stub is provided for
*
* ENTRY:
* nBar (input)
* SB_HORZ or SB_VERT: to indicate which scrolling direction to check.
* EXIT:
* Returns the nMax value from the standard Windows GetScrollLimit() API.
* Also contains an ASSERT to check for nMin != 0.
*
******************************************************************************/
int
CRowView::GetScrollLimit( int nBar )
{
int nMin, nMax;
GetScrollRange(nBar, &nMin, &nMax);
ASSERT(nMin == 0);
return nMax;
} // end CRowView::GetScrollLimit
#endif
void
CRowView::CalculateRowMetrics( CDC* pDC )
{
GetRowWidthHeight( pDC, m_nRowWidth, m_nRowHeight );
} // end CRowView::CalculateRowMetrics
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 effected (added,
* deleted, or changed) -- 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 the
* 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 ) );
/*
* We'll also calculate the number of rows that the view should be scrolled
* during PageUp / PageDown. This number will always be at least 1.
*/
m_nPageScrollRows = (m_nPageScrollRows =
((rectClient.bottom / m_nRowHeight)-1)) >= 1 ?
m_nPageScrollRows : 1;
/*
* 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 );
} // end CRowView::UpdateScrollSizes
int
CRowView::RowToYPos( int nRow )
{
return ( nRow * m_nRowHeight );
} // end CRowView::RowToYPos
CRect
CRowView::RowToWndRect( CDC* pDC,
int nRow )
{
/*
* MODIFICATION: Set right end of returned rectangle to max of end of row,
* or screen width. This will assure full update in case of horizontall
* scrolling on very wide rows (> screen width).
*/
int nHorzRes = pDC->GetDeviceCaps(HORZRES);
CRect rect( 0, nRow * m_nRowHeight,
max( m_nRowWidth, nHorzRes ), (nRow + 1) * m_nRowHeight );
pDC->LPtoDP( &rect );
return rect;
} // end CRowView::RowToWndRect
int
CRowView::LastViewableRow()
{
return ( (INT_MAX / m_nRowHeight) - 1 );
} // end CRowView::LastViewableRow
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 );
} // end CRowView::RectLPtoRowRange
/////////////////////////////////////////////////////////////////////////////
// CRowView message map
BEGIN_MESSAGE_MAP(CRowView, CScrollView)
//{{AFX_MSG_MAP(CRowView)
ON_WM_KEYDOWN()
ON_WM_SIZE()
ON_WM_LBUTTONDOWN()
ON_WM_HSCROLL()
ON_WM_CREATE()
ON_WM_VSCROLL()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CRowView commands
/*******************************************************************************
*
* OnSize - CRowView member function: command (override of CWnd)
*
* Processes size change message.
*
* ENTRY:
*
* (Refer to CWnd::OnSize documentation)
*
* EXIT:
*
******************************************************************************/
void
CRowView::OnSize( UINT nType,
int cx,
int cy )
{
UpdateScrollSizes();
CScrollView::OnSize(nType, cx, cy);
} // end CRowView::OnSize
/*******************************************************************************
*
* OnKeyDown - CRowView member function: command (override of CWnd)
*
* Processes list scrolling / selection via keyboard input.
*
* ENTRY:
*
* (Refer to CWnd::OnKeyDown documentation)
*
* EXIT:
*
******************************************************************************/
void
CRowView::OnKeyDown( UINT nChar,
UINT nRepCnt,
UINT nFlags )
{
int nNewRow;
switch ( nChar ) {
case VK_HOME:
ChangeSelectionToRow(0);
break;
case VK_END:
ChangeSelectionToRow(GetRowCount() - 1);
break;
case VK_UP:
ChangeSelectionNextRow(FALSE);
break;
case VK_DOWN:
ChangeSelectionNextRow(TRUE);
break;
case VK_PRIOR:
/*
* Determine a new row that is one 'pageup' above our currently
* active row and make it active.
*/
nNewRow = (nNewRow = GetActiveRow() - m_nPageScrollRows) >
0 ? nNewRow : 0;
ChangeSelectionToRow(nNewRow);
break;
case VK_NEXT:
/*
* Determine a new row that is one 'pagedown' below our currently
* active row and make it active.
*/
nNewRow = (nNewRow = GetActiveRow() + m_nPageScrollRows) <
GetRowCount() ? nNewRow : GetRowCount() - 1;
ChangeSelectionToRow(nNewRow);
break;
case VK_LEFT:
/*
* Scroll page-left.
*/
if ( IsScrollingNeeded(SB_HORZ) ) {
OnHScroll( SB_PAGELEFT, 0, GetScrollBarCtrl(SB_HORZ) );
return;
}
break;
case VK_RIGHT:
/*
* Scroll page-right.
*/
if ( IsScrollingNeeded(SB_HORZ) ) {
OnHScroll(SB_PAGERIGHT, 0, GetScrollBarCtrl(SB_HORZ));
return;
}
break;
default:
/*
* Call the CScrollView OnKeyDown function for keys not
* specifically handled here.
*/
CScrollView::OnKeyDown( nChar, nRepCnt, nFlags );
}
} // end CRowView::OnKeyDown
/*******************************************************************************
*
* OnLButtonDown - CRowView member function: command (override of CWnd)
*
* Processes left mouse button for list item selection.
*
* ENTRY:
*
* (Refer to CWnd::OnLButtonDown documentation)
*
* EXIT:
*
******************************************************************************/
void
CRowView::OnLButtonDown( UINT nFlags,
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);
} // end CRowView::OnLButtonDown
/*******************************************************************************
*
* OnHScroll - CRowView member function: command (override of CScrollView)
*
* Handles horizontal scrolling message. The CScrollView member function
* is overriden to allow us to call the CRowView::OnScroll override during
* a Hscroll message.
*
* ENTRY:
*
* (Refer to CWnd::OnHScroll documentation)
*
* EXIT:
*
******************************************************************************/
void
CRowView::OnHScroll( UINT nSBCode,
UINT nPos,
CScrollBar* pScrollBar )
{
VERIFY( pScrollBar == GetScrollBarCtrl(SB_HORZ) ); // may be null
OnScroll( SB_HORZ, nSBCode, nPos );
} // end CRowView::OnHScroll
/*******************************************************************************
*
* OnVScroll - CRowView member function: command (override of CScrollView)
*
* Handles vertical scrolling message. The CScrollView member function is
* overriden to allow us to call the CRowView::OnScroll override during a
* Vscroll message.
*
* ENTRY:
*
* (Refer to CWnd::OnVScroll documentation)
*
* EXIT:
*
******************************************************************************/
void
CRowView::OnVScroll( UINT nSBCode,
UINT nPos,
CScrollBar* pScrollBar )
{
VERIFY( pScrollBar == GetScrollBarCtrl(SB_HORZ) ); // may be null
OnScroll( SB_VERT, nSBCode, nPos );
} // end CRowView::OnVScroll
/*******************************************************************************
*
* OnScroll - CRowView member function: command (override of CScrollView)
*
* Processes horizontal scrolling. The CScrollView member function
* is overriden to properly scroll the header bar (if it is defined) and
* to handle or ignore SB_THUMBTRACK scroll messages.
*
* ENTRY:
* nBar (input)
* SB_HORZ or SB_VERT.
* nSBCode (input)
* Scroll bar code.
* nPos (input)
* Scroll-box position for SB_THUMBTRACK handling.
* EXIT:
*
*
* NOTE: This code is a slight modificaton of the CScrollView::OnScroll code
* found in the VIEWSCRL.CPP MFC 2.5 source. The GetScrollLimit()
* function has been added to handle Windows95 scrollbar controls
* (when built with MFC 3.0 and above - MFC300 defined).
*
******************************************************************************/
void
CRowView::OnScroll( int nBar,
UINT nSBCode,
UINT nPos )
{
VERIFY(nBar == SB_HORZ || nBar == SB_VERT);
BOOL bHorz = (nBar == SB_HORZ);
int zOrig, z; // z = x or y depending on 'nBar'
int zMax;
zOrig = z = GetScrollPos(nBar);
zMax = GetScrollLimit(nBar);
if (zMax <= 0)
{
TRACE0("Warning: no scroll range - ignoring scroll message\n");
VERIFY(z == 0); // must be at top
return;
}
switch (nSBCode)
{
case SB_TOP:
z = 0;
break;
case SB_BOTTOM:
z = zMax;
break;
case SB_LINEUP:
z -= bHorz ? m_lineDev.cx : m_lineDev.cy;
break;
case SB_LINEDOWN:
z += bHorz ? m_lineDev.cx : m_lineDev.cy;
break;
case SB_PAGEUP:
z -= bHorz ? m_pageDev.cx : m_pageDev.cy;
break;
case SB_PAGEDOWN:
z += bHorz ? m_pageDev.cx : m_pageDev.cy;
break;
case SB_THUMBTRACK:
/*
* If we're not handling the SB_THUMBTRACK messages, return.
*/
if ( !m_bThumbTrack )
return;
z = nPos;
break;
case SB_THUMBPOSITION:
z = nPos;
break;
default: // ignore other notifications
return;
}
if (z < 0)
z = 0;
else if (z > zMax)
z = zMax;
if (z != zOrig)
{
if (bHorz) {
ScrollWindow(-(z-zOrig), 0);
/*
* If this view has a header bar, scroll it to match the view.
*/
if ( m_pHeaderBar )
m_pHeaderBar->ScrollWindow( -(z-zOrig), 0 );
} else
ScrollWindow(0, -(z-zOrig));
SetScrollPos(nBar, z);
UpdateWindow();
/*
* If this view has a header bar, update it now.
*/
if ( m_pHeaderBar )
m_pHeaderBar->UpdateWindow();
}
} // end CRowView::OnScroll
#if _MFC_VER >= 0x400
void CRowViewHeaderBar::OnPaint()
{
CPaintDC dc(this); // device context for painting
// TODO: Add your message handler code here
// Do not call CStatusBar::OnPaint() for painting messages
DoPaint(&dc);
}
#endif
Reference in a new issue Copy permalink