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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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mfc
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src
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trckrect.cpp
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1998-06-16
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// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.
#include "stdafx.h"
#ifdef AFX_CORE4_SEG
#pragma code_seg(AFX_CORE4_SEG)
#endif
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define new DEBUG_NEW
/////////////////////////////////////////////////////////////////////////////
// CRectTracker global state
// various GDI objects we need to draw
AFX_STATIC_DATA HCURSOR _afxCursors[10] = { 0, };
AFX_STATIC_DATA HBRUSH _afxHatchBrush = 0;
AFX_STATIC_DATA HPEN _afxBlackDottedPen = 0;
AFX_STATIC_DATA int _afxHandleSize = 0;
void AFX_CDECL AfxTrackerTerm()
{
AfxDeleteObject((HGDIOBJ*)&_afxHatchBrush);
AfxDeleteObject((HGDIOBJ*)&_afxBlackDottedPen);
}
char _afxTrackerTerm = (char)atexit(&AfxTrackerTerm);
// the struct below is used to determine the qualities of a particular handle
struct AFX_HANDLEINFO
{
size_t nOffsetX; // offset within RECT for X coordinate
size_t nOffsetY; // offset within RECT for Y coordinate
int nCenterX; // adjust X by Width()/2 * this number
int nCenterY; // adjust Y by Height()/2 * this number
int nHandleX; // adjust X by handle size * this number
int nHandleY; // adjust Y by handle size * this number
int nInvertX; // handle converts to this when X inverted
int nInvertY; // handle converts to this when Y inverted
};
// this array describes all 8 handles (clock-wise)
AFX_STATIC_DATA const AFX_HANDLEINFO _afxHandleInfo[] =
{
// corner handles (top-left, top-right, bottom-right, bottom-left
{ offsetof(RECT, left), offsetof(RECT, top), 0, 0, 0, 0, 1, 3 },
{ offsetof(RECT, right), offsetof(RECT, top), 0, 0, -1, 0, 0, 2 },
{ offsetof(RECT, right), offsetof(RECT, bottom), 0, 0, -1, -1, 3, 1 },
{ offsetof(RECT, left), offsetof(RECT, bottom), 0, 0, 0, -1, 2, 0 },
// side handles (top, right, bottom, left)
{ offsetof(RECT, left), offsetof(RECT, top), 1, 0, 0, 0, 4, 6 },
{ offsetof(RECT, right), offsetof(RECT, top), 0, 1, -1, 0, 7, 5 },
{ offsetof(RECT, left), offsetof(RECT, bottom), 1, 0, 0, -1, 6, 4 },
{ offsetof(RECT, left), offsetof(RECT, top), 0, 1, 0, 0, 5, 7 }
};
// the struct below gives us information on the layout of a RECT struct and
// the relationship between its members
struct AFX_RECTINFO
{
size_t nOffsetAcross; // offset of opposite point (ie. left->right)
int nSignAcross; // sign relative to that point (ie. add/subtract)
};
// this array is indexed by the offset of the RECT member / sizeof(int)
AFX_STATIC_DATA const AFX_RECTINFO _afxRectInfo[] =
{
{ offsetof(RECT, right), +1 },
{ offsetof(RECT, bottom), +1 },
{ offsetof(RECT, left), -1 },
{ offsetof(RECT, top), -1 },
};
/////////////////////////////////////////////////////////////////////////////
// CRectTracker intitialization
CRectTracker::CRectTracker(LPCRECT lpSrcRect, UINT nStyle)
{
ASSERT(AfxIsValidAddress(lpSrcRect, sizeof(RECT), FALSE));
Construct();
m_rect.CopyRect(lpSrcRect);
m_nStyle = nStyle;
}
void CRectTracker::Construct()
{
// do one-time initialization if necessary
AfxLockGlobals(CRIT_RECTTRACKER);
static BOOL bInitialized;
if (!bInitialized)
{
// sanity checks for assumptions we make in the code
ASSERT(sizeof(((RECT*)NULL)->left) == sizeof(int));
ASSERT(offsetof(RECT, top) > offsetof(RECT, left));
ASSERT(offsetof(RECT, right) > offsetof(RECT, top));
ASSERT(offsetof(RECT, bottom) > offsetof(RECT, right));
if (_afxHatchBrush == NULL)
{
// create the hatch pattern + bitmap
WORD hatchPattern[8];
WORD wPattern = 0x1111;
for (int i = 0; i < 4; i++)
{
hatchPattern[i] = wPattern;
hatchPattern[i+4] = wPattern;
wPattern <<= 1;
}
HBITMAP hatchBitmap = CreateBitmap(8, 8, 1, 1, &hatchPattern);
if (hatchBitmap == NULL)
{
AfxUnlockGlobals(CRIT_RECTTRACKER);
AfxThrowResourceException();
}
// create black hatched brush
_afxHatchBrush = CreatePatternBrush(hatchBitmap);
DeleteObject(hatchBitmap);
if (_afxHatchBrush == NULL)
{
AfxUnlockGlobals(CRIT_RECTTRACKER);
AfxThrowResourceException();
}
}
if (_afxBlackDottedPen == NULL)
{
// create black dotted pen
_afxBlackDottedPen = CreatePen(PS_DOT, 0, RGB(0, 0, 0));
if (_afxBlackDottedPen == NULL)
{
AfxUnlockGlobals(CRIT_RECTTRACKER);
AfxThrowResourceException();
}
}
// Note: all track cursors must live in same module
HINSTANCE hInst = AfxFindResourceHandle(
MAKEINTRESOURCE(AFX_IDC_TRACK4WAY), RT_GROUP_CURSOR);
// initialize the cursor array
_afxCursors[0] = ::LoadCursor(hInst, MAKEINTRESOURCE(AFX_IDC_TRACKNWSE));
_afxCursors[1] = ::LoadCursor(hInst, MAKEINTRESOURCE(AFX_IDC_TRACKNESW));
_afxCursors[2] = _afxCursors[0];
_afxCursors[3] = _afxCursors[1];
_afxCursors[4] = ::LoadCursor(hInst, MAKEINTRESOURCE(AFX_IDC_TRACKNS));
_afxCursors[5] = ::LoadCursor(hInst, MAKEINTRESOURCE(AFX_IDC_TRACKWE));
_afxCursors[6] = _afxCursors[4];
_afxCursors[7] = _afxCursors[5];
_afxCursors[8] = ::LoadCursor(hInst, MAKEINTRESOURCE(AFX_IDC_TRACK4WAY));
_afxCursors[9] = ::LoadCursor(hInst, MAKEINTRESOURCE(AFX_IDC_MOVE4WAY));
// get default handle size from Windows profile setting
static const TCHAR szWindows[] = _T("windows");
static const TCHAR szInplaceBorderWidth[] =
_T("oleinplaceborderwidth");
_afxHandleSize = GetProfileInt(szWindows, szInplaceBorderWidth, 4);
bInitialized = TRUE;
}
AfxUnlockGlobals(CRIT_RECTTRACKER);
m_nStyle = 0;
m_nHandleSize = _afxHandleSize;
m_sizeMin.cy = m_sizeMin.cx = m_nHandleSize*2;
m_rectLast.SetRectEmpty();
m_sizeLast.cx = m_sizeLast.cy = 0;
m_bErase = FALSE;
m_bFinalErase = FALSE;
}
CRectTracker::~CRectTracker()
{
}
/////////////////////////////////////////////////////////////////////////////
// CRectTracker operations
void CRectTracker::Draw(CDC* pDC) const
{
// set initial DC state
VERIFY(pDC->SaveDC() != 0);
pDC->SetMapMode(MM_TEXT);
pDC->SetViewportOrg(0, 0);
pDC->SetWindowOrg(0, 0);
// get normalized rectangle
CRect rect = m_rect;
rect.NormalizeRect();
CPen* pOldPen = NULL;
CBrush* pOldBrush = NULL;
CGdiObject* pTemp;
int nOldROP;
// draw lines
if ((m_nStyle & (dottedLine|solidLine)) != 0)
{
if (m_nStyle & dottedLine)
pOldPen = pDC->SelectObject(CPen::FromHandle(_afxBlackDottedPen));
else
pOldPen = (CPen*)pDC->SelectStockObject(BLACK_PEN);
pOldBrush = (CBrush*)pDC->SelectStockObject(NULL_BRUSH);
nOldROP = pDC->SetROP2(R2_COPYPEN);
rect.InflateRect(+1, +1); // borders are one pixel outside
pDC->Rectangle(rect.left, rect.top, rect.right, rect.bottom);
pDC->SetROP2(nOldROP);
}
// if hatchBrush is going to be used, need to unrealize it
if ((m_nStyle & (hatchInside|hatchedBorder)) != 0)
UnrealizeObject(_afxHatchBrush);
// hatch inside
if ((m_nStyle & hatchInside) != 0)
{
pTemp = pDC->SelectStockObject(NULL_PEN);
if (pOldPen == NULL)
pOldPen = (CPen*)pTemp;
pTemp = pDC->SelectObject(CBrush::FromHandle(_afxHatchBrush));
if (pOldBrush == NULL)
pOldBrush = (CBrush*)pTemp;
pDC->SetBkMode(TRANSPARENT);
nOldROP = pDC->SetROP2(R2_MASKNOTPEN);
pDC->Rectangle(rect.left+1, rect.top+1, rect.right, rect.bottom);
pDC->SetROP2(nOldROP);
}
// draw hatched border
if ((m_nStyle & hatchedBorder) != 0)
{
pTemp = pDC->SelectObject(CBrush::FromHandle(_afxHatchBrush));
if (pOldBrush == NULL)
pOldBrush = (CBrush*)pTemp;
pDC->SetBkMode(OPAQUE);
CRect rectTrue;
GetTrueRect(&rectTrue);
pDC->PatBlt(rectTrue.left, rectTrue.top, rectTrue.Width(),
rect.top-rectTrue.top, 0x000F0001 /* Pn */);
pDC->PatBlt(rectTrue.left, rect.bottom,
rectTrue.Width(), rectTrue.bottom-rect.bottom, 0x000F0001 /* Pn */);
pDC->PatBlt(rectTrue.left, rect.top, rect.left-rectTrue.left,
rect.Height(), 0x000F0001 /* Pn */);
pDC->PatBlt(rect.right, rect.top, rectTrue.right-rect.right,
rect.Height(), 0x000F0001 /* Pn */);
}
// draw resize handles
if ((m_nStyle & (resizeInside|resizeOutside)) != 0)
{
UINT mask = GetHandleMask();
for (int i = 0; i < 8; ++i)
{
if (mask & (1<<i))
{
GetHandleRect((TrackerHit)i, &rect);
pDC->FillSolidRect(rect, RGB(0, 0, 0));
}
}
}
// cleanup pDC state
if (pOldPen != NULL)
pDC->SelectObject(pOldPen);
if (pOldBrush != NULL)
pDC->SelectObject(pOldBrush);
VERIFY(pDC->RestoreDC(-1));
}
BOOL CRectTracker::SetCursor(CWnd* pWnd, UINT nHitTest) const
{
// trackers should only be in client area
if (nHitTest != HTCLIENT)
return FALSE;
// convert cursor position to client co-ordinates
CPoint point;
GetCursorPos(&point);
pWnd->ScreenToClient(&point);
// do hittest and normalize hit
int nHandle = HitTestHandles(point);
if (nHandle < 0)
return FALSE;
// need to normalize the hittest such that we get proper cursors
nHandle = NormalizeHit(nHandle);
// handle special case of hitting area between handles
// (logically the same -- handled as a move -- but different cursor)
if (nHandle == hitMiddle && !m_rect.PtInRect(point))
{
// only for trackers with hatchedBorder (ie. in-place resizing)
if (m_nStyle & hatchedBorder)
nHandle = (TrackerHit)9;
}
ASSERT(nHandle < _countof(_afxCursors));
::SetCursor(_afxCursors[nHandle]);
return TRUE;
}
int CRectTracker::HitTest(CPoint point) const
{
TrackerHit hitResult = hitNothing;
CRect rectTrue;
GetTrueRect(&rectTrue);
ASSERT(rectTrue.left <= rectTrue.right);
ASSERT(rectTrue.top <= rectTrue.bottom);
if (rectTrue.PtInRect(point))
{
if ((m_nStyle & (resizeInside|resizeOutside)) != 0)
hitResult = (TrackerHit)HitTestHandles(point);
else
hitResult = hitMiddle;
}
return hitResult;
}
int CRectTracker::NormalizeHit(int nHandle) const
{
ASSERT(nHandle <= 8 && nHandle >= -1);
if (nHandle == hitMiddle || nHandle == hitNothing)
return nHandle;
const AFX_HANDLEINFO* pHandleInfo = &_afxHandleInfo[nHandle];
if (m_rect.Width() < 0)
{
nHandle = (TrackerHit)pHandleInfo->nInvertX;
pHandleInfo = &_afxHandleInfo[nHandle];
}
if (m_rect.Height() < 0)
nHandle = (TrackerHit)pHandleInfo->nInvertY;
return nHandle;
}
BOOL CRectTracker::Track(CWnd* pWnd, CPoint point, BOOL bAllowInvert,
CWnd* pWndClipTo)
{
// perform hit testing on the handles
int nHandle = HitTestHandles(point);
if (nHandle < 0)
{
// didn't hit a handle, so just return FALSE
return FALSE;
}
// otherwise, call helper function to do the tracking
m_bAllowInvert = bAllowInvert;
return TrackHandle(nHandle, pWnd, point, pWndClipTo);
}
BOOL CRectTracker::TrackRubberBand(CWnd* pWnd, CPoint point, BOOL bAllowInvert)
{
// simply call helper function to track from bottom right handle
m_bAllowInvert = bAllowInvert;
m_rect.SetRect(point.x, point.y, point.x, point.y);
return TrackHandle(hitBottomRight, pWnd, point, NULL);
}
void CRectTracker::DrawTrackerRect(
LPCRECT lpRect, CWnd* pWndClipTo, CDC* pDC, CWnd* pWnd)
{
// first, normalize the rectangle for drawing
CRect rect = *lpRect;
rect.NormalizeRect();
// convert to client coordinates
if (pWndClipTo != NULL)
{
pWnd->ClientToScreen(&rect);
pWndClipTo->ScreenToClient(&rect);
}
CSize size(0, 0);
if (!m_bFinalErase)
{
// otherwise, size depends on the style
if (m_nStyle & hatchedBorder)
{
size.cx = size.cy = max(1, GetHandleSize(rect)-1);
rect.InflateRect(size);
}
else
{
size.cx = CX_BORDER;
size.cy = CY_BORDER;
}
}
// and draw it
if (m_bFinalErase || !m_bErase)
pDC->DrawDragRect(rect, size, m_rectLast, m_sizeLast);
// remember last rectangles
m_rectLast = rect;
m_sizeLast = size;
}
void CRectTracker::AdjustRect(int nHandle, LPRECT)
{
if (nHandle == hitMiddle)
return;
// convert the handle into locations within m_rect
int *px, *py;
GetModifyPointers(nHandle, &px, &py, NULL, NULL);
// enforce minimum width
int nNewWidth = m_rect.Width();
int nAbsWidth = m_bAllowInvert ? abs(nNewWidth) : nNewWidth;
if (px != NULL && nAbsWidth < m_sizeMin.cx)
{
nNewWidth = nAbsWidth != 0 ? nNewWidth / nAbsWidth : 1;
ASSERT((int*)px - (int*)&m_rect < _countof(_afxRectInfo));
const AFX_RECTINFO* pRectInfo = &_afxRectInfo[(int*)px - (int*)&m_rect];
*px = *(int*)((BYTE*)&m_rect + pRectInfo->nOffsetAcross) +
nNewWidth * m_sizeMin.cx * -pRectInfo->nSignAcross;
}
// enforce minimum height
int nNewHeight = m_rect.Height();
int nAbsHeight = m_bAllowInvert ? abs(nNewHeight) : nNewHeight;
if (py != NULL && nAbsHeight < m_sizeMin.cy)
{
nNewHeight = nAbsHeight != 0 ? nNewHeight / nAbsHeight : 1;
ASSERT((int*)py - (int*)&m_rect < _countof(_afxRectInfo));
const AFX_RECTINFO* pRectInfo = &_afxRectInfo[(int*)py - (int*)&m_rect];
*py = *(int*)((BYTE*)&m_rect + pRectInfo->nOffsetAcross) +
nNewHeight * m_sizeMin.cy * -pRectInfo->nSignAcross;
}
}
void CRectTracker::GetTrueRect(LPRECT lpTrueRect) const
{
ASSERT(AfxIsValidAddress(lpTrueRect, sizeof(RECT)));
CRect rect = m_rect;
rect.NormalizeRect();
int nInflateBy = 0;
if ((m_nStyle & (resizeOutside|hatchedBorder)) != 0)
nInflateBy += GetHandleSize() - 1;
if ((m_nStyle & (solidLine|dottedLine)) != 0)
++nInflateBy;
rect.InflateRect(nInflateBy, nInflateBy);
*lpTrueRect = rect;
}
void CRectTracker::OnChangedRect(const CRect& /*rectOld*/)
{
// no default implementation, useful for derived classes
}
/////////////////////////////////////////////////////////////////////////////
// CRectTracker implementation helpers
void CRectTracker::GetHandleRect(int nHandle, CRect* pHandleRect) const
{
ASSERT(nHandle < 8);
// get normalized rectangle of the tracker
CRect rectT = m_rect;
rectT.NormalizeRect();
if ((m_nStyle & (solidLine|dottedLine)) != 0)
rectT.InflateRect(+1, +1);
// since the rectangle itself was normalized, we also have to invert the
// resize handles.
nHandle = NormalizeHit(nHandle);
// handle case of resize handles outside the tracker
int size = GetHandleSize();
if (m_nStyle & resizeOutside)
rectT.InflateRect(size-1, size-1);
// calculate position of the resize handle
int nWidth = rectT.Width();
int nHeight = rectT.Height();
CRect rect;
const AFX_HANDLEINFO* pHandleInfo = &_afxHandleInfo[nHandle];
rect.left = *(int*)((BYTE*)&rectT + pHandleInfo->nOffsetX);
rect.top = *(int*)((BYTE*)&rectT + pHandleInfo->nOffsetY);
rect.left += size * pHandleInfo->nHandleX;
rect.top += size * pHandleInfo->nHandleY;
rect.left += pHandleInfo->nCenterX * (nWidth - size) / 2;
rect.top += pHandleInfo->nCenterY * (nHeight - size) / 2;
rect.right = rect.left + size;
rect.bottom = rect.top + size;
*pHandleRect = rect;
}
int CRectTracker::GetHandleSize(LPCRECT lpRect) const
{
if (lpRect == NULL)
lpRect = &m_rect;
int size = m_nHandleSize;
if (!(m_nStyle & resizeOutside))
{
// make sure size is small enough for the size of the rect
int sizeMax = min(abs(lpRect->right - lpRect->left),
abs(lpRect->bottom - lpRect->top));
if (size * 2 > sizeMax)
size = sizeMax / 2;
}
return size;
}
int CRectTracker::HitTestHandles(CPoint point) const
{
CRect rect;
UINT mask = GetHandleMask();
// see if hit anywhere inside the tracker
GetTrueRect(&rect);
if (!rect.PtInRect(point))
return hitNothing; // totally missed
// see if we hit a handle
for (int i = 0; i < 8; ++i)
{
if (mask & (1<<i))
{
GetHandleRect((TrackerHit)i, &rect);
if (rect.PtInRect(point))
return (TrackerHit)i;
}
}
// last of all, check for non-hit outside of object, between resize handles
if ((m_nStyle & hatchedBorder) == 0)
{
CRect rect = m_rect;
rect.NormalizeRect();
if ((m_nStyle & dottedLine|solidLine) != 0)
rect.InflateRect(+1, +1);
if (!rect.PtInRect(point))
return hitNothing; // must have been between resize handles
}
return hitMiddle; // no handle hit, but hit object (or object border)
}
BOOL CRectTracker::TrackHandle(int nHandle, CWnd* pWnd, CPoint point,
CWnd* pWndClipTo)
{
ASSERT(nHandle >= 0);
ASSERT(nHandle <= 8); // handle 8 is inside the rect
// don't handle if capture already set
if (::GetCapture() != NULL)
return FALSE;
AfxLockTempMaps(); // protect maps while looping
ASSERT(!m_bFinalErase);
// save original width & height in pixels
int nWidth = m_rect.Width();
int nHeight = m_rect.Height();
// set capture to the window which received this message
pWnd->SetCapture();
ASSERT(pWnd == CWnd::GetCapture());
pWnd->UpdateWindow();
if (pWndClipTo != NULL)
pWndClipTo->UpdateWindow();
CRect rectSave = m_rect;
// find out what x/y coords we are supposed to modify
int *px, *py;
int xDiff, yDiff;
GetModifyPointers(nHandle, &px, &py, &xDiff, &yDiff);
xDiff = point.x - xDiff;
yDiff = point.y - yDiff;
// get DC for drawing
CDC* pDrawDC;
if (pWndClipTo != NULL)
{
// clip to arbitrary window by using adjusted Window DC
pDrawDC = pWndClipTo->GetDCEx(NULL, DCX_CACHE);
}
else
{
// otherwise, just use normal DC
pDrawDC = pWnd->GetDC();
}
ASSERT_VALID(pDrawDC);
CRect rectOld;
BOOL bMoved = FALSE;
// get messages until capture lost or cancelled/accepted
for (;;)
{
MSG msg;
VERIFY(::GetMessage(&msg, NULL, 0, 0));
if (CWnd::GetCapture() != pWnd)
break;
switch (msg.message)
{
// handle movement/accept messages
case WM_LBUTTONUP:
case WM_MOUSEMOVE:
rectOld = m_rect;
// handle resize cases (and part of move)
if (px != NULL)
*px = (int)(short)LOWORD(msg.lParam) - xDiff;
if (py != NULL)
*py = (int)(short)HIWORD(msg.lParam) - yDiff;
// handle move case
if (nHandle == hitMiddle)
{
m_rect.right = m_rect.left + nWidth;
m_rect.bottom = m_rect.top + nHeight;
}
// allow caller to adjust the rectangle if necessary
AdjustRect(nHandle, &m_rect);
// only redraw and callback if the rect actually changed!
m_bFinalErase = (msg.message == WM_LBUTTONUP);
if (!rectOld.EqualRect(&m_rect) || m_bFinalErase)
{
if (bMoved)
{
m_bErase = TRUE;
DrawTrackerRect(&rectOld, pWndClipTo, pDrawDC, pWnd);
}
OnChangedRect(rectOld);
if (msg.message != WM_LBUTTONUP)
bMoved = TRUE;
}
if (m_bFinalErase)
goto ExitLoop;
if (!rectOld.EqualRect(&m_rect))
{
m_bErase = FALSE;
DrawTrackerRect(&m_rect, pWndClipTo, pDrawDC, pWnd);
}
break;
// handle cancel messages
case WM_KEYDOWN:
if (msg.wParam != VK_ESCAPE)
break;
case WM_RBUTTONDOWN:
if (bMoved)
{
m_bErase = m_bFinalErase = TRUE;
DrawTrackerRect(&m_rect, pWndClipTo, pDrawDC, pWnd);
}
m_rect = rectSave;
goto ExitLoop;
// just dispatch rest of the messages
default:
DispatchMessage(&msg);
break;
}
}
ExitLoop:
if (pWndClipTo != NULL)
pWndClipTo->ReleaseDC(pDrawDC);
else
pWnd->ReleaseDC(pDrawDC);
ReleaseCapture();
AfxUnlockTempMaps(FALSE);
// restore rect in case bMoved is still FALSE
if (!bMoved)
m_rect = rectSave;
m_bFinalErase = FALSE;
m_bErase = FALSE;
// return TRUE only if rect has changed
return !rectSave.EqualRect(&m_rect);
}
void CRectTracker::GetModifyPointers(
int nHandle, int** ppx, int** ppy, int* px, int* py)
{
ASSERT(nHandle >= 0);
ASSERT(nHandle <= 8);
if (nHandle == hitMiddle)
nHandle = hitTopLeft; // same as hitting top-left
*ppx = NULL;
*ppy = NULL;
// fill in the part of the rect that this handle modifies
// (Note: handles that map to themselves along a given axis when that
// axis is inverted don't modify the value on that axis)
const AFX_HANDLEINFO* pHandleInfo = &_afxHandleInfo[nHandle];
if (pHandleInfo->nInvertX != nHandle)
{
*ppx = (int*)((BYTE*)&m_rect + pHandleInfo->nOffsetX);
if (px != NULL)
*px = **ppx;
}
else
{
// middle handle on X axis
if (px != NULL)
*px = m_rect.left + abs(m_rect.Width()) / 2;
}
if (pHandleInfo->nInvertY != nHandle)
{
*ppy = (int*)((BYTE*)&m_rect + pHandleInfo->nOffsetY);
if (py != NULL)
*py = **ppy;
}
else
{
// middle handle on Y axis
if (py != NULL)
*py = m_rect.top + abs(m_rect.Height()) / 2;
}
}
UINT CRectTracker::GetHandleMask() const
{
UINT mask = 0x0F; // always have 4 corner handles
int size = m_nHandleSize*3;
if (abs(m_rect.Width()) - size > 4)
mask |= 0x50;
if (abs(m_rect.Height()) - size > 4)
mask |= 0xA0;
return mask;
}
/////////////////////////////////////////////////////////////////////////////