research/transmission_spectroscopy/TOF/Win32++/samples/Picture/src/View.cpp

   1 //////////////////////////////////////////////\r
   2 // View.cpp\r
   3 //  Definitions for the CView class\r
   4 \r
   5 \r
   6 #include "stdafx.h"\r
   7 #include "PictureApp.h"\r
   8 #include "Mainfrm.h"\r
   9 #include "view.h"\r
  10 #include "resource.h"\r
  11 \r
  12 #define HIMETRIC_INCH   2540\r
  13 \r
  14 CView::CView() : m_pPicture(NULL),m_BStrString(NULL),\r
  15                                         m_xCurrentScroll(0), m_yCurrentScroll(0)\r
  16 {\r
  17         ::CoInitialize(NULL);\r
  18 }\r
  19 \r
  20 CView::~CView()\r
  21 {\r
  22         if (m_pPicture)\r
  23                 m_pPicture->Release();\r
  24 \r
  25         ::CoUninitialize();\r
  26 }\r
  27 \r
  28 CRect CView::GetImageRect()\r
  29 {\r
  30         // get width and height of picture\r
  31         long hmWidth = 0;\r
  32         long hmHeight = 0;\r
  33 \r
  34         if (m_pPicture)\r
  35         {\r
  36                 m_pPicture->get_Width(&hmWidth);\r
  37                 m_pPicture->get_Height(&hmHeight);\r
  38         }\r
  39 \r
  40         // convert himetric to pixels\r
  41         CClientDC dc(this);\r
  42         int nWidth      = MulDiv(hmWidth, dc.GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH);\r
  43         int nHeight     = MulDiv(hmHeight, dc.GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH);\r
  44 \r
  45         CRect rcImage;\r
  46         rcImage.right = MAX(nWidth, 200);\r
  47         rcImage.bottom = MAX(nHeight, 200);\r
  48         return rcImage;\r
  49 }\r
  50 \r
  51 void CView::NewPictureFile()\r
  52 {\r
  53         if (m_pPicture)\r
  54         {\r
  55                 m_pPicture->Release();\r
  56                 m_pPicture = NULL;\r
  57         }\r
  58 \r
  59         GetParent()->SetWindowText(LoadString(IDW_MAIN).c_str());\r
  60         Invalidate();\r
  61 }\r
  62 \r
  63 BOOL CView::LoadPictureFile(LPCTSTR szFile)\r
  64 {\r
  65         if (m_pPicture)\r
  66         {\r
  67                 m_pPicture->Release();\r
  68                 m_pPicture = NULL;\r
  69         }\r
  70 \r
  71         TRACE(szFile);\r
  72         TRACE(_T("\n"));\r
  73 \r
  74         m_xCurrentScroll = 0;\r
  75         m_yCurrentScroll = 0;\r
  76         ShowScrollBar(SB_HORZ, FALSE);\r
  77         ShowScrollBar(SB_VERT, FALSE);\r
  78 \r
  79         // Create IPicture from image file\r
  80         if (S_OK == ::OleLoadPicturePath(T2OLE(szFile), NULL, 0, 0,     IID_IPicture, (LPVOID *)&m_pPicture))\r
  81         {\r
  82                 GetParent()->SetWindowText(szFile);\r
  83                 CMainFrame& Frame = GetPicApp().GetMainFrame();\r
  84                 Frame.AdjustFrameRect(GetImageRect());\r
  85                 Invalidate();\r
  86                 return TRUE;\r
  87         }\r
  88         else\r
  89         {\r
  90                 TRACE(_T("Failed to load picture\n"));\r
  91 \r
  92                 // Set Frame title back to default\r
  93                 GetParent()->SetWindowText(LoadString(IDW_MAIN).c_str());\r
  94                 return FALSE;\r
  95         }\r
  96 }\r
  97 \r
  98 void CView::OnDraw(CDC* pDC)\r
  99 {\r
 100         Paint(*pDC);\r
 101 }\r
 102 \r
 103 void CView::OnInitialUpdate()\r
 104 {\r
 105         // Set the window background to black\r
 106         m_Brush.CreateSolidBrush(RGB(0,0,0));\r
 107         SetClassLongPtr(GCLP_HBRBACKGROUND, (LONG_PTR)m_Brush.GetHandle());\r
 108 \r
 109         // Load picture at startup\r
 110         TCHAR szPath[MAX_STRING_SIZE];\r
 111         TCHAR szFile[] = _T("/PongaFern.jpg");\r
 112         GetCurrentDirectory(MAX_STRING_SIZE - lstrlen(szFile) , szPath);\r
 113         lstrcat(szPath, _T("./PongaFern.jpg"));\r
 114 \r
 115         if (LoadPictureFile(szPath))\r
 116         {\r
 117                 CMainFrame& Frame = GetPicApp().GetMainFrame();\r
 118                 CRect rcImage = GetImageRect();\r
 119                 Frame.AdjustFrameRect(rcImage);\r
 120         }\r
 121 }\r
 122 \r
 123 void CView::OnHScroll(WPARAM wParam, LPARAM /*lParam*/)\r
 124 {\r
 125         int xNewPos;\r
 126 \r
 127         switch (LOWORD(wParam))\r
 128         {\r
 129                 case SB_PAGEUP: // User clicked the scroll bar shaft left of the scroll box.\r
 130                         xNewPos = m_xCurrentScroll - 50;\r
 131                         break;\r
 132 \r
 133                 case SB_PAGEDOWN: // User clicked the scroll bar shaft right of the scroll box.\r
 134                         xNewPos = m_xCurrentScroll + 50;\r
 135                         break;\r
 136 \r
 137                 case SB_LINEUP: // User clicked the left arrow.\r
 138                         xNewPos = m_xCurrentScroll - 5;\r
 139                         break;\r
 140 \r
 141                 case SB_LINEDOWN: // User clicked the right arrow.\r
 142                         xNewPos = m_xCurrentScroll + 5;\r
 143                         break;\r
 144 \r
 145                 case SB_THUMBPOSITION: // User dragged the scroll box.\r
 146                         xNewPos = HIWORD(wParam);\r
 147                         break;\r
 148 \r
 149                 case SB_THUMBTRACK: // User dragging the scroll box.\r
 150                         xNewPos = HIWORD(wParam);\r
 151                         break;\r
 152 \r
 153                 default:\r
 154                         xNewPos = m_xCurrentScroll;\r
 155         }\r
 156 \r
 157         // Scroll the window.\r
 158         xNewPos = MAX(0, xNewPos);\r
 159         xNewPos = MIN( xNewPos, GetImageRect().Width() - GetClientRect().Width() );\r
 160         int xDelta = xNewPos - m_xCurrentScroll;\r
 161         m_xCurrentScroll = xNewPos;\r
 162         ScrollWindowEx(-xDelta, 0,  NULL, NULL, NULL, NULL, SW_INVALIDATE);\r
 163 \r
 164         // Reset the scroll bar.\r
 165         SCROLLINFO si = {0};\r
 166         si.cbSize = sizeof(si);\r
 167         si.fMask  = SIF_RANGE | SIF_PAGE | SIF_POS;\r
 168         si.fMask  = SIF_POS;\r
 169         si.nPos   = m_xCurrentScroll;\r
 170         SetScrollInfo(SB_HORZ, si, TRUE);\r
 171 }\r
 172 \r
 173 void CView::OnVScroll(WPARAM wParam, LPARAM /*lParam*/)\r
 174 {\r
 175         int yNewPos;\r
 176 \r
 177         switch (LOWORD(wParam))\r
 178         {\r
 179                 case SB_PAGEUP: // User clicked the scroll bar shaft above the scroll box.\r
 180                         yNewPos = m_yCurrentScroll - 50;\r
 181                         break;\r
 182 \r
 183                 case SB_PAGEDOWN: // User clicked the scroll bar shaft below the scroll box.\r
 184                         yNewPos = m_yCurrentScroll + 50;\r
 185                         break;\r
 186 \r
 187                 case SB_LINEUP: // User clicked the top arrow.\r
 188                         yNewPos = m_yCurrentScroll - 5;\r
 189                         break;\r
 190 \r
 191                 case SB_LINEDOWN: // User clicked the bottom arrow.\r
 192                         yNewPos = m_yCurrentScroll + 5;\r
 193                         break;\r
 194 \r
 195                 case SB_THUMBPOSITION: // User dragged the scroll box.\r
 196                         yNewPos = HIWORD(wParam);\r
 197                         break;\r
 198 \r
 199                 case SB_THUMBTRACK: // User dragging the scroll box.\r
 200                         yNewPos = HIWORD(wParam);\r
 201                         break;\r
 202 \r
 203                 default:\r
 204                         yNewPos = m_yCurrentScroll;\r
 205         }\r
 206 \r
 207         // Scroll the window.\r
 208         yNewPos = MAX(0, yNewPos);\r
 209         yNewPos = MIN( yNewPos, GetImageRect().Height() - GetClientRect().Height() );\r
 210         int yDelta = yNewPos - m_yCurrentScroll;\r
 211         m_yCurrentScroll = yNewPos;\r
 212         ScrollWindowEx(0, -yDelta, NULL, NULL, NULL, NULL, SW_INVALIDATE);\r
 213 \r
 214         // Reset the scroll bar.\r
 215         SCROLLINFO si = {0};\r
 216         si.cbSize = sizeof(si);\r
 217         si.fMask  = SIF_RANGE | SIF_PAGE | SIF_POS;\r
 218         si.cbSize = sizeof(si);\r
 219         si.fMask  = SIF_POS;\r
 220         si.nPos   = m_yCurrentScroll;\r
 221         SetScrollInfo(SB_VERT, si, TRUE);\r
 222 }\r
 223 \r
 224 void CView::OnWindowPosChanged(WPARAM /*wParam*/, LPARAM /*lParam*/)\r
 225 {\r
 226         if (m_pPicture)\r
 227         {\r
 228                 CRect rcImage = GetImageRect();\r
 229                 DWORD dwStyle = (DWORD)GetWindowLongPtr(GWL_STYLE);\r
 230                 DWORD dwExStyle = (DWORD)GetWindowLongPtr(GWL_EXSTYLE);\r
 231                 AdjustWindowRectEx(&rcImage, dwStyle, FALSE, dwExStyle);\r
 232 \r
 233                 CRect rcView = GetClientRect();\r
 234                 AdjustWindowRectEx(&rcView, dwStyle, FALSE, dwExStyle);\r
 235 \r
 236                 SCROLLINFO si = {0};\r
 237                 si.cbSize = sizeof(si);\r
 238                 si.fMask  = SIF_RANGE | SIF_PAGE | SIF_POS;\r
 239                 si.nMin   = 0;\r
 240 \r
 241                 if (rcView.Width()  >= rcImage.Width())\r
 242                 {\r
 243                         m_xCurrentScroll = 0;\r
 244                         ShowScrollBar(SB_HORZ, FALSE);\r
 245                 }\r
 246                 else\r
 247                 {\r
 248                         si.nMax   = rcImage.Width();\r
 249                         si.nPage  = rcView.Width();\r
 250                         si.nPos   = m_xCurrentScroll;\r
 251                         SetScrollInfo(SB_HORZ, si, TRUE);\r
 252                         ShowScrollBar(SB_HORZ, TRUE);\r
 253                 }\r
 254 \r
 255                 if (rcView.Height() >= rcImage.Height())\r
 256                 {\r
 257                         m_yCurrentScroll = 0;\r
 258                         ShowScrollBar(SB_VERT, FALSE);\r
 259                 }\r
 260                 else\r
 261                 {\r
 262                         si.nMax   = rcImage.Height();\r
 263                         si.nPage  = rcView.Height();\r
 264                         si.nPos   = m_yCurrentScroll;\r
 265                         SetScrollInfo(SB_VERT, si, TRUE);\r
 266                         ShowScrollBar(SB_VERT, TRUE);\r
 267                 }\r
 268 \r
 269                 int xNewPos = MIN(m_xCurrentScroll, rcImage.Width() - rcView.Width());\r
 270                 m_xCurrentScroll = MAX(xNewPos, 0);\r
 271                 int yNewPos = MIN(m_yCurrentScroll, rcImage.Height() - rcView.Height());\r
 272                 m_yCurrentScroll = MAX(yNewPos, 0);\r
 273 \r
 274                 // Paint the window directly to eliminate flicker\r
 275                 CClientDC dcView(this);\r
 276                 Paint(dcView);\r
 277         }\r
 278 }\r
 279 \r
 280 void CView::Paint(HDC hDC)\r
 281 {\r
 282         if (m_pPicture)\r
 283         {\r
 284                 // get width and height of picture\r
 285                 long hmWidth;\r
 286                 long hmHeight;\r
 287                 m_pPicture->get_Width(&hmWidth);\r
 288                 m_pPicture->get_Height(&hmHeight);\r
 289 \r
 290                 // convert himetric to pixels\r
 291                 int nWidth      = MulDiv(hmWidth, GetDeviceCaps(hDC, LOGPIXELSX), HIMETRIC_INCH);\r
 292                 int nHeight     = MulDiv(hmHeight, GetDeviceCaps(hDC, LOGPIXELSY), HIMETRIC_INCH);\r
 293 \r
 294                 // calculate himetric start pos\r
 295                 int xStart = MulDiv(m_xCurrentScroll, HIMETRIC_INCH, GetDeviceCaps(hDC, LOGPIXELSX));\r
 296                 int yStart = MulDiv(m_yCurrentScroll, HIMETRIC_INCH, GetDeviceCaps(hDC, LOGPIXELSY));\r
 297 \r
 298                 // Render the picture to the DC\r
 299                 m_pPicture->Render(hDC, 0, 0, nWidth, nHeight, xStart, hmHeight - yStart, hmWidth, -hmHeight, NULL);\r
 300         }\r
 301 }\r
 302 \r
 303 void CView::PreCreate(CREATESTRUCT &cs)\r
 304 {\r
 305         // Set the Window Class name\r
 306         cs.lpszClass = _T("PictureView");\r
 307 \r
 308         cs.style = WS_CHILD | WS_HSCROLL | WS_VSCROLL ;\r
 309 \r
 310         // Set the extended style\r
 311         cs.dwExStyle = WS_EX_CLIENTEDGE;\r
 312 }\r
 313 \r
 314 void CView::SavePicture(LPCTSTR szFile)\r
 315 {\r
 316         // get a IPictureDisp interface from your IPicture pointer\r
 317         IPictureDisp *pDisp = NULL;\r
 318 \r
 319         if (SUCCEEDED(m_pPicture->QueryInterface(IID_IPictureDisp,  (void**) &pDisp)))\r
 320         {\r
 321                 // Save the IPicture image as a bitmap\r
 322                 OleSavePictureFile(pDisp,  T2BSTR(szFile));\r
 323                 pDisp->Release();\r
 324         }\r
 325 }\r
 326 \r
 327 LRESULT CView::WndProc(UINT uMsg, WPARAM wParam, LPARAM lParam)\r
 328 {\r
 329         switch (uMsg)\r
 330         {\r
 331         case WM_WINDOWPOSCHANGED:\r
 332                 OnWindowPosChanged(wParam, lParam);\r
 333                 break;\r
 334 \r
 335         case WM_HSCROLL:\r
 336                 OnHScroll(wParam, lParam);\r
 337                 break;\r
 338 \r
 339         case WM_VSCROLL:\r
 340                 OnVScroll(wParam, lParam);\r
 341         break;\r
 342         }\r
 343 \r
 344         // Pass unhandled messages on for default processing\r
 345         return WndProcDefault(uMsg, wParam, lParam);\r
 346 }\r
 347 \r
 348 \r