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ResizingDialog.cpp
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ResizingDialog.cpp
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// A flicker-free resizing dialog class
// Copyright (c) 1999 Andy Brown <andy@mirage.dabsol.co.uk>
// You may do whatever you like with this file, I just don't care.
#include "stdafx.h"
#include "ResizingDialog.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
IMPLEMENT_DYNCREATE(CResizingDialog, CDialog)
// used if OEMRESOURCE not defined in precompiled headers
#ifndef OBM_SIZE
#define OBM_SIZE 32766
#endif
CResizingDialog::CResizingDialog(const UINT resID, CWnd *pParent)
: CDialog(resID, pParent)
{
//{{AFX_DATA_INIT(CResizingDialog)
//}}AFX_DATA_INIT
// allow all sizing
m_xAllow = sizeResize;
m_yAllow = sizeResize;
// not initialized yet
m_bInited = false;
}
BEGIN_MESSAGE_MAP(CResizingDialog, CDialog)
ON_WM_SIZE()
ON_WM_GETMINMAXINFO()
ON_WM_ERASEBKGND()
ON_WM_NCHITTEST()
END_MESSAGE_MAP()
BOOL CResizingDialog::OnInitDialog()
{
// call the base class
CDialog::OnInitDialog();
CRect rcIcon,rcDialogClient;
// get the dialog size
GetClientRect(rcDialogClient);
GetWindowRect(m_rcDialog);
m_MinSize.x = m_rcDialog.Width();
m_MinSize.y = m_rcDialog.Height();
// set up the size icon
m_wndSizeGrip.Create(this, rcDialogClient, m_idSizeIcon);
// make it auto-position
AddControl(m_idSizeIcon, sizeRepos, sizeRepos, FALSE);
// all done
m_bInited = true;
return TRUE;
}
void CResizingDialog::OnSize(UINT nType, int cx, int cy)
{
// call the base class
CDialog::OnSize(nType,cx,cy);
CRect rect;
HDWP hdwp;
std::vector<CItem>::iterator it;
// start deferring window pos
hdwp = BeginDeferWindowPos(20);
if (!m_Items.empty())
{
// get the new size
GetWindowRect(rect);
// children can resize themselves
for (it=m_Items.begin(); it!=m_Items.end(); it++)
it->OnSize(hdwp, m_rcDialog, rect, this);
}
OnSizeItem(nType, cx, cy, hdwp);
// do the deferred window position change
EndDeferWindowPos(hdwp);
// remember new size
m_rcDialog = rect;
}
void CResizingDialog::OnSizeItem(UINT nType, int cx, int cy, HDWP hdwp)
{
}
void CResizingDialog::OnGetMinMaxInfo(MINMAXINFO *lpMMI)
{
if (m_bInited)
{
lpMMI->ptMinTrackSize = m_MinSize;
if (m_xAllow == sizeNone)
lpMMI->ptMaxTrackSize.x = lpMMI->ptMaxSize.x = m_MinSize.x;
if (m_yAllow == sizeNone)
lpMMI->ptMaxTrackSize.y = lpMMI->ptMaxSize.y = m_MinSize.y;
}
}
BOOL CResizingDialog::OnEraseBkgnd(CDC *pDC)
{
std::vector<CItem>::const_iterator it;
for (it=m_Items.begin(); it!=m_Items.end(); it++)
{
// skip over the size icon if it's been hidden
if (it->m_resID == m_idSizeIcon && !m_wndSizeGrip.IsWindowVisible())
{
m_wndSizeGrip.SetWindowPos(NULL, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
continue;
}
if (it->m_bFlickerFree)
pDC->ExcludeClipRect(it->m_rcControl);
}
CDialog::OnEraseBkgnd(pDC);
return FALSE;
}
void CResizingDialog::AddControl(const UINT resID, const eSizeType xsize, const eSizeType ysize, const bool bFlickerFree)
{
CItem item;
GetDlgItem(resID)->GetWindowRect(item.m_rcControl);
ScreenToClient(item.m_rcControl);
item.m_bFlickerFree = bFlickerFree;
item.m_resID = resID;
item.m_xSize = xsize;
item.m_ySize = ysize;
if (xsize == sizeRelative)
item.m_xRatio = (double)item.m_rcControl.left / ((double)m_rcDialog.Width() - (double)item.m_rcControl.left);
if (ysize == sizeRelative)
item.m_yRatio = (double)item.m_rcControl.top / ((double)m_rcDialog.Height() - (double)item.m_rcControl.top);
m_Items.push_back(item);
}
void CResizingDialog::AllowSizing(const eSizeType xsize, const eSizeType ysize)
{
m_xAllow = xsize;
m_yAllow = ysize;
}
void CResizingDialog::HideSizeIcon(void)
{
m_wndSizeGrip.ShowWindow(SW_HIDE);
}
CResizingDialog::CItem::CItem()
{
}
CResizingDialog::CItem::CItem(const CItem& src)
{
Assign(src);
}
CResizingDialog::CItem& CResizingDialog::CItem::operator=(const CItem& src)
{
Assign(src);
return *this;
}
void CResizingDialog::CItem::Assign(const CItem& src)
{
m_rcControl = src.m_rcControl;
m_resID = src.m_resID;
m_xSize = src.m_xSize;
m_ySize = src.m_ySize;
m_bFlickerFree = src.m_bFlickerFree;
m_xRatio = src.m_xRatio;
m_yRatio = src.m_yRatio;
}
void CResizingDialog::CItem::OnSize(HDWP hdwp, const CRect& rcParentOld, const CRect& rcParentNew, CWnd *pDlg)
{
CSize diff;
CRect rcControl;
CWnd *pWnd;
int newpos,newsize;
pWnd = pDlg->GetDlgItem(m_resID);
diff.cx = rcParentNew.Width() - rcParentOld.Width();
diff.cy = rcParentNew.Height() - rcParentOld.Height();
rcControl = m_rcControl;
switch (m_xSize)
{
case sizeResize:
rcControl.right += diff.cx;
break;
case sizeRepos:
rcControl.left += diff.cx;
rcControl.right += diff.cx;
break;
case sizeRelative:
newpos = (int)((m_xRatio*(double)rcParentNew.Width()) / (1.0+m_xRatio));
newsize = rcControl.Width();
rcControl.left = newpos;
rcControl.right = newpos+newsize;
break;
}
switch (m_ySize)
{
case sizeResize:
rcControl.bottom += diff.cy;
break;
case sizeRepos:
rcControl.top += diff.cy;
rcControl.bottom += diff.cy;
break;
case sizeRelative:
newpos = (int)((m_yRatio * (double)rcParentNew.Height()) / (1.0 + m_yRatio));
newsize = rcControl.Height();
rcControl.top = newpos;
rcControl.bottom = newpos + newsize;
break;
}
if (rcControl != m_rcControl)
{
DeferWindowPos(hdwp, *pWnd, NULL, rcControl.left, rcControl.top, rcControl.Width(), rcControl.Height(), SWP_NOZORDER);
m_rcControl = rcControl;
}
}
LRESULT CResizingDialog::OnNcHitTest(CPoint point)
{
CRect rSizeRect ;
m_wndSizeGrip.GetWindowRect(&rSizeRect) ;
// Test to see if the cursor is within the 'gripper'
// bitmap, and tell the system that the user is over
// the lower right-hand corner if it is.
if (rSizeRect.PtInRect(point))
{
return HTBOTTOMRIGHT ;
}
else
{
return CDialog::OnNcHitTest(point) ;
}
}