ext/ResizableLib/ResizableFormView.cpp

   1 // ResizableFormView.cpp : implementation file
   2 //
   3 /////////////////////////////////////////////////////////////////////////////
   4 //
   5 // This file is part of ResizableLib
   6 // http://sourceforge.net/projects/resizablelib
   7 //
   8 // Copyright (C) 2000-2004 by Paolo Messina
   9 // http://www.geocities.com/ppescher - mailto:ppescher@hotmail.com
  10 //
  11 // The contents of this file are subject to the Artistic License (the "License").
  12 // You may not use this file except in compliance with the License.
  13 // You may obtain a copy of the License at:
  14 // http://www.opensource.org/licenses/artistic-license.html
  15 //
  16 // If you find this code useful, credits would be nice!
  17 //
  18 /////////////////////////////////////////////////////////////////////////////
  19
  20 #include "stdafx.h"
  21 #include "ResizableFormView.h"
  22
  23 #ifdef _DEBUG
  24 #define new DEBUG_NEW
  25 #undef THIS_FILE
  26 static char THIS_FILE[] = __FILE__;
  27 #endif
  28
  29 /////////////////////////////////////////////////////////////////////////////
  30 // CResizableFormView
  31
  32 IMPLEMENT_DYNAMIC(CResizableFormView, CFormView)
  33
  34 inline void CResizableFormView::PrivateConstruct()
  35 {
  36         m_dwGripTempState = GHR_SCROLLBAR | GHR_ALIGNMENT | GHR_MAXIMIZED;
  37 }
  38
  39 CResizableFormView::CResizableFormView(UINT nIDTemplate)
  40         : CFormView(nIDTemplate)
  41 {
  42         PrivateConstruct();
  43 }
  44
  45 CResizableFormView::CResizableFormView(LPCTSTR lpszTemplateName)
  46         : CFormView(lpszTemplateName)
  47 {
  48         PrivateConstruct();
  49 }
  50
  51 CResizableFormView::~CResizableFormView()
  52 {
  53 }
  54
  55
  56 BEGIN_MESSAGE_MAP(CResizableFormView, CFormView)
  57         //{{AFX_MSG_MAP(CResizableFormView)
  58         ON_WM_SIZE()
  59         ON_WM_ERASEBKGND()
  60         ON_WM_GETMINMAXINFO()
  61         ON_WM_DESTROY()
  62         ON_WM_NCCREATE()
  63         //}}AFX_MSG_MAP
  64 END_MESSAGE_MAP()
  65
  66 /////////////////////////////////////////////////////////////////////////////
  67 // CResizableFormView diagnostics
  68
  69 #ifdef _DEBUG
  70 void CResizableFormView::AssertValid() const
  71 {
  72         CFormView::AssertValid();
  73 }
  74
  75 void CResizableFormView::Dump(CDumpContext& dc) const
  76 {
  77         CFormView::Dump(dc);
  78 }
  79 #endif //_DEBUG
  80
  81 /////////////////////////////////////////////////////////////////////////////
  82 // CResizableFormView message handlers
  83
  84 void CResizableFormView::OnSize(UINT nType, int cx, int cy)
  85 {
  86         CFormView::OnSize(nType, cx, cy);
  87
  88         CWnd* pParent = GetParentFrame();
  89
  90         // hide size grip when parent is maximized
  91         if (pParent->IsZoomed())
  92                 HideSizeGrip(&m_dwGripTempState, GHR_MAXIMIZED);
  93         else
  94                 ShowSizeGrip(&m_dwGripTempState, GHR_MAXIMIZED);
  95
  96         // hide size grip when there are scrollbars
  97         CSize size = GetTotalSize();
  98         if ((cx < size.cx || cy < size.cy) && (m_nMapMode >= 0))
  99                 HideSizeGrip(&m_dwGripTempState, GHR_SCROLLBAR);
 100         else
 101                 ShowSizeGrip(&m_dwGripTempState, GHR_SCROLLBAR);
 102
 103         // hide size grip when the parent frame window is not resizable
 104         // or the form is not bottom-right aligned (e.g. there's a statusbar)
 105         DWORD dwStyle = pParent->GetStyle();
 106         CRect rect, rectChild;
 107         GetWindowRect(rect);
 108
 109         BOOL bCanResize = TRUE; // whether the grip can size the frame
 110         for (HWND hWndChild = ::GetWindow(m_hWnd, GW_HWNDFIRST); hWndChild != NULL;
 111                 hWndChild = ::GetNextWindow(hWndChild, GW_HWNDNEXT))
 112         {
 113                 ::GetWindowRect(hWndChild, rectChild);
 114                 //! @todo check RTL layouts!
 115                 if (rectChild.right > rect.right || rectChild.bottom > rect.bottom)
 116                 {
 117                         bCanResize = FALSE;
 118                         break;
 119                 }
 120         }
 121         if ((dwStyle & WS_THICKFRAME) && bCanResize)
 122                 ShowSizeGrip(&m_dwGripTempState, GHR_ALIGNMENT);
 123         else
 124                 HideSizeGrip(&m_dwGripTempState, GHR_ALIGNMENT);
 125
 126         // update grip and layout
 127         UpdateSizeGrip();
 128         ArrangeLayout();
 129 }
 130
 131 void CResizableFormView::GetTotalClientRect(LPRECT lpRect) const
 132 {
 133         GetClientRect(lpRect);
 134
 135         // get dialog template's size
 136         // (this is set in CFormView::Create)
 137         CSize sizeTotal, sizePage, sizeLine;
 138         int nMapMode = 0;
 139         GetDeviceScrollSizes(nMapMode, sizeTotal, sizePage, sizeLine);
 140
 141         // otherwise, give the correct size if scrollbars active
 142
 143         if (nMapMode < 0)       // scrollbars disabled
 144                 return;
 145
 146         // enlarge reported client area when needed
 147         CRect rect(lpRect);
 148         if (rect.Width() < sizeTotal.cx)
 149                 rect.right = rect.left + sizeTotal.cx;
 150         if (rect.Height() < sizeTotal.cy)
 151                 rect.bottom = rect.top + sizeTotal.cy;
 152
 153         rect.OffsetRect(-GetDeviceScrollPosition());
 154         *lpRect = rect;
 155 }
 156
 157 BOOL CResizableFormView::OnEraseBkgnd(CDC* pDC)
 158 {
 159         ClipChildren(pDC, FALSE);
 160
 161         BOOL bRet = CFormView::OnEraseBkgnd(pDC);
 162
 163         ClipChildren(pDC, TRUE);
 164
 165         return bRet;
 166 }
 167
 168 void CResizableFormView::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI)
 169 {
 170         MinMaxInfo(lpMMI);
 171 }
 172
 173 void CResizableFormView::OnDestroy()
 174 {
 175         RemoveAllAnchors();
 176
 177         CFormView::OnDestroy();
 178 }
 179
 180 LRESULT CResizableFormView::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
 181 {
 182         if (message == WM_INITDIALOG)
 183                 return (LRESULT)OnInitDialog();
 184
 185         if (message != WM_NCCALCSIZE || wParam == 0)
 186                 return CFormView::WindowProc(message, wParam, lParam);
 187
 188         // specifying valid rects needs controls already anchored
 189         LRESULT lResult = 0;
 190         HandleNcCalcSize(FALSE, (LPNCCALCSIZE_PARAMS)lParam, lResult);
 191         lResult = CFormView::WindowProc(message, wParam, lParam);
 192         HandleNcCalcSize(TRUE, (LPNCCALCSIZE_PARAMS)lParam, lResult);
 193         return lResult;
 194 }
 195
 196 BOOL CResizableFormView::OnInitDialog()
 197 {
 198         const MSG* pMsg = GetCurrentMessage();
 199
 200         BOOL bRet = (BOOL)CFormView::WindowProc(pMsg->message, pMsg->wParam, pMsg->lParam);
 201
 202         // we need to associate member variables with control IDs
 203         UpdateData(FALSE);
 204
 205         // set default scroll size
 206         CRect rectTemplate;
 207         GetWindowRect(rectTemplate);
 208         SetScrollSizes(MM_TEXT, rectTemplate.Size());
 209
 210         return bRet;
 211 }
 212
 213 BOOL CResizableFormView::OnNcCreate(LPCREATESTRUCT lpCreateStruct)
 214 {
 215         if (!CFormView::OnNcCreate(lpCreateStruct))
 216                 return FALSE;
 217
 218         // create and init the size-grip
 219         if (!CreateSizeGrip())
 220                 return FALSE;
 221
 222         return TRUE;
 223 }