reactos/dll/cpl/desk/preview.c

   1 /*
   2  * PROJECT:     ReactOS Timedate Control Panel
   3  * LICENSE:     GPL - See COPYING in the top level directory
   4  * FILE:        lib/cpl/desk/preview.c
   5  * PURPOSE:     Draws the preview control
   6  * COPYRIGHT:   Copyright 2006, 2007 Eric Kohl
   7  */
   8
   9 #include "desk.h"
  10 #include "preview.h"
  11
  12 static const TCHAR szPreviewWndClass[] = TEXT("PreviewWndClass");
  13
  14 typedef struct _PREVIEW_DATA
  15 {
  16     HWND hwndParent;
  17
  18     DWORD clrDesktop;
  19     HBRUSH hbrDesktop;
  20
  21     DWORD clrWindow;
  22     HBRUSH hbrWindow;
  23
  24     DWORD clrScrollbar;
  25     HBRUSH hbrScrollbar;
  26
  27     DWORD clrActiveCaptionText;
  28     DWORD clrInactiveCaptionText;
  29     DWORD clrWindowText;
  30     DWORD clrButtonText;
  31
  32     INT cxEdge;
  33     INT cyEdge;
  34
  35     INT cyCaption;
  36
  37     RECT rcDesktop;
  38     RECT rcInactiveFrame;
  39     RECT rcInactiveCaption;
  40     RECT rcInactiveCaptionButtons;
  41
  42     RECT rcActiveFrame;
  43     RECT rcActiveCaption;
  44     RECT rcActiveCaptionButtons;
  45     RECT rcActiveMenuBar;
  46     RECT rcSelectedMenuItem;
  47     RECT rcActiveClient;
  48     RECT rcActiveScroll;
  49
  50     RECT rcDialogFrame;
  51     RECT rcDialogCaption;
  52     RECT rcDialogCaptionButtons;
  53     RECT rcDialogClient;
  54
  55     RECT rcDialogButton;
  56
  57     LPTSTR lpInAct;
  58     LPTSTR lpAct;
  59     LPTSTR lpWinTxt;
  60     LPTSTR lpMessBox;
  61     LPTSTR lpMessText;
  62     LPTSTR lpButText;
  63
  64     LOGFONT lfCaptionFont;
  65     LOGFONT lfMenuFont;
  66     LOGFONT lfMessageFont;
  67
  68     HFONT hCaptionFont;
  69     HFONT hMenuFont;
  70     HFONT hMessageFont;
  71
  72     HMENU hMenu;
  73
  74 } PREVIEW_DATA, *PPREVIEW_DATA;
  75
  76
  77
  78 static VOID
  79 DrawCaptionButtons(HDC hdc, LPRECT lpRect, BOOL bMinMax)
  80 {
  81     RECT rc3;
  82     RECT rc4;
  83     RECT rc5;
  84
  85     rc3.left = lpRect->right - 2 - 16;
  86     rc3.top = lpRect->top + 2;
  87     rc3.right = lpRect->right - 2;
  88     rc3.bottom = lpRect->bottom - 2;
  89
  90     DrawFrameControl(hdc, &rc3, DFC_CAPTION, DFCS_CAPTIONCLOSE);
  91
  92     if (bMinMax)
  93     {
  94         rc4.left = rc3.left - 16 - 2;
  95         rc4.top = rc3.top;
  96         rc4.right = rc3.right - 16 - 2;
  97         rc4.bottom = rc3.bottom;
  98
  99         DrawFrameControl(hdc, &rc4, DFC_CAPTION, DFCS_CAPTIONMAX);
 100
 101         rc5.left = rc4.left - 16;
 102         rc5.top = rc4.top;
 103         rc5.right = rc4.right - 16;
 104         rc5.bottom = rc4.bottom;
 105
 106         DrawFrameControl(hdc, &rc5, DFC_CAPTION, DFCS_CAPTIONMIN);
 107     }
 108 }
 109
 110 static VOID
 111 DrawScrollbar(HDC hdc, LPRECT rc, HBRUSH hbrScrollbar)
 112 {
 113     RECT rcTop;
 114     RECT rcBottom;
 115     RECT rcMiddle;
 116     int width;
 117
 118     width = rc->right - rc->left;
 119
 120     rcTop.left = rc->left;
 121     rcTop.right = rc->right;
 122     rcTop.top = rc->top;
 123     rcTop.bottom = rc->top + width;
 124
 125     rcMiddle.left = rc->left;
 126     rcMiddle.right = rc->right;
 127     rcMiddle.top = rc->top + width;
 128     rcMiddle.bottom = rc->bottom - width;
 129
 130     rcBottom.left = rc->left;
 131     rcBottom.right = rc->right;
 132     rcBottom.top = rc->bottom - width;
 133     rcBottom.bottom = rc->bottom;
 134
 135     DrawFrameControl(hdc, &rcTop, DFC_SCROLL, DFCS_SCROLLUP);
 136     DrawFrameControl(hdc, &rcBottom, DFC_SCROLL, DFCS_SCROLLDOWN);
 137
 138     FillRect(hdc, &rcMiddle, hbrScrollbar);
 139 }
 140
 141
 142 static VOID
 143 OnCreate(HWND hwnd, PPREVIEW_DATA pPreviewData)
 144 {
 145     NONCLIENTMETRICS NonClientMetrics;
 146
 147     pPreviewData->clrScrollbar = GetSysColor(COLOR_SCROLLBAR);
 148     pPreviewData->hbrScrollbar = CreateSolidBrush(pPreviewData->clrScrollbar);
 149
 150     pPreviewData->clrDesktop = GetSysColor(COLOR_DESKTOP);
 151     pPreviewData->hbrDesktop = CreateSolidBrush(pPreviewData->clrDesktop);
 152     pPreviewData->clrWindow = GetSysColor(COLOR_WINDOW);
 153     pPreviewData->hbrWindow = CreateSolidBrush(pPreviewData->clrWindow);
 154
 155     pPreviewData->clrActiveCaptionText = GetSysColor(COLOR_CAPTIONTEXT);
 156     pPreviewData->clrInactiveCaptionText = GetSysColor(COLOR_INACTIVECAPTIONTEXT);
 157     pPreviewData->clrWindowText = GetSysColor(COLOR_WINDOWTEXT);
 158     pPreviewData->clrButtonText = GetSysColor(COLOR_BTNTEXT);
 159
 160     pPreviewData->cxEdge = GetSystemMetrics(SM_CXEDGE);
 161     pPreviewData->cyEdge = GetSystemMetrics(SM_CXEDGE);
 162
 163     pPreviewData->cyCaption = 20; //GetSystemMetrics(SM_CYCAPTION);
 164
 165     /* load font info */
 166     NonClientMetrics.cbSize = sizeof(NONCLIENTMETRICS);
 167     SystemParametersInfo(SPI_GETNONCLIENTMETRICS, sizeof(NONCLIENTMETRICS), &NonClientMetrics, 0);
 168
 169     pPreviewData->lfCaptionFont = NonClientMetrics.lfCaptionFont;
 170     pPreviewData->hCaptionFont = CreateFontIndirect(&pPreviewData->lfCaptionFont);
 171
 172     pPreviewData->lfMenuFont = NonClientMetrics.lfMenuFont;
 173     pPreviewData->hMenuFont = CreateFontIndirect(&pPreviewData->lfMenuFont);
 174
 175     pPreviewData->lfMessageFont = NonClientMetrics.lfMessageFont;
 176     pPreviewData->hMessageFont = CreateFontIndirect(&pPreviewData->lfMessageFont);
 177
 178     /* Load and modify the menu */
 179     pPreviewData->hMenu = LoadMenu(hApplet, MAKEINTRESOURCE(IDR_PREVIEW_MENU));
 180     EnableMenuItem(pPreviewData->hMenu, ID_MENU_DISABLED,
 181                    MF_BYCOMMAND | MF_DISABLED);
 182     HiliteMenuItem(hwnd, pPreviewData->hMenu,
 183                    ID_MENU_SELECTED, MF_BYCOMMAND | MF_HILITE);
 184
 185 //    GetMenuItemRect(hwnd, pPreviewData->hMenu,
 186 //                    ID_MENU_SELECTED, &pPreviewData->rcSelectedMenuItem);
 187
 188
 189     AllocAndLoadString(&pPreviewData->lpInAct, hApplet, IDS_INACTWIN);
 190     AllocAndLoadString(&pPreviewData->lpAct, hApplet, IDS_ACTWIN);
 191     AllocAndLoadString(&pPreviewData->lpWinTxt, hApplet, IDS_WINTEXT);
 192     AllocAndLoadString(&pPreviewData->lpMessBox, hApplet, IDS_MESSBOX);
 193     AllocAndLoadString(&pPreviewData->lpMessText, hApplet, IDS_MESSTEXT);
 194     AllocAndLoadString(&pPreviewData->lpButText, hApplet, IDS_BUTTEXT);
 195 }
 196
 197
 198 static VOID
 199 OnSize(INT cx, INT cy, PPREVIEW_DATA pPreviewData)
 200 {
 201     int width, height;
 202
 203     /* Get Desktop rectangle */
 204     pPreviewData->rcDesktop.left = 0;
 205     pPreviewData->rcDesktop.top = 0;
 206     pPreviewData->rcDesktop.right = cx;
 207     pPreviewData->rcDesktop.bottom = cy;
 208
 209     /* Calculate the inactive window rectangle */
 210     pPreviewData->rcInactiveFrame.left = pPreviewData->rcDesktop.left + 8;
 211     pPreviewData->rcInactiveFrame.top = pPreviewData->rcDesktop.top + 8;
 212     pPreviewData->rcInactiveFrame.right = pPreviewData->rcDesktop.right - 25;
 213     pPreviewData->rcInactiveFrame.bottom = pPreviewData->rcDesktop.bottom - 30;
 214
 215     /* Calculate the inactive caption rectangle */
 216     pPreviewData->rcInactiveCaption.left = pPreviewData->rcInactiveFrame.left + pPreviewData->cxEdge + 1/*3*/ + 1;
 217     pPreviewData->rcInactiveCaption.top = pPreviewData->rcInactiveFrame.top + pPreviewData->cyEdge + 1/*3*/ + 1;
 218     pPreviewData->rcInactiveCaption.right = pPreviewData->rcInactiveFrame.right - pPreviewData->cxEdge - 1/*3*/ - 1;
 219     pPreviewData->rcInactiveCaption.bottom = pPreviewData->rcInactiveFrame.top + pPreviewData->cyCaption /*20*/ + 2;
 220
 221     /* Calculate the inactive caption buttons rectangle */
 222     pPreviewData->rcInactiveCaptionButtons.left = pPreviewData->rcInactiveCaption.right - 2 - 2 - 3 * 16;
 223     pPreviewData->rcInactiveCaptionButtons.top = pPreviewData->rcInactiveCaption.top + 2;
 224     pPreviewData->rcInactiveCaptionButtons.right = pPreviewData->rcInactiveCaption.right - 2;
 225     pPreviewData->rcInactiveCaptionButtons.bottom = pPreviewData->rcInactiveCaption.bottom - 2;
 226
 227     /* Calculate the active window rectangle */
 228     pPreviewData->rcActiveFrame.left = pPreviewData->rcInactiveFrame.left + 3 + 1;
 229     pPreviewData->rcActiveFrame.top = pPreviewData->rcInactiveCaption.bottom + 1;
 230     pPreviewData->rcActiveFrame.right = pPreviewData->rcDesktop.right - 10;
 231     pPreviewData->rcActiveFrame.bottom = pPreviewData->rcDesktop.bottom - 25;
 232
 233     /* Calculate the active caption rectangle */
 234     pPreviewData->rcActiveCaption.left = pPreviewData->rcActiveFrame.left + 3 + 1;
 235     pPreviewData->rcActiveCaption.top = pPreviewData->rcActiveFrame.top + 3 + 1;
 236     pPreviewData->rcActiveCaption.right = pPreviewData->rcActiveFrame.right - 3 - 1;
 237     pPreviewData->rcActiveCaption.bottom = pPreviewData->rcActiveFrame.top + pPreviewData->cyCaption/*20*/ + 2;
 238
 239     /* Calculate the active caption buttons rectangle */
 240     pPreviewData->rcActiveCaptionButtons.left = pPreviewData->rcActiveCaption.right - 2 - 2 - 3 * 16;
 241     pPreviewData->rcActiveCaptionButtons.top = pPreviewData->rcActiveCaption.top + 2;
 242     pPreviewData->rcActiveCaptionButtons.right = pPreviewData->rcActiveCaption.right - 2;
 243     pPreviewData->rcActiveCaptionButtons.bottom = pPreviewData->rcActiveCaption.bottom - 2;
 244
 245     /* Calculate the active menu bar rectangle */
 246     pPreviewData->rcActiveMenuBar.left = pPreviewData->rcActiveFrame.left + 3 + 1;
 247     pPreviewData->rcActiveMenuBar.top = pPreviewData->rcActiveCaption.bottom + 1;
 248     pPreviewData->rcActiveMenuBar.right = pPreviewData->rcActiveFrame.right - 3 - 1;
 249     pPreviewData->rcActiveMenuBar.bottom = pPreviewData->rcActiveMenuBar.top + 20;
 250
 251     /* Calculate the active client rectangle */
 252     pPreviewData->rcActiveClient.left = pPreviewData->rcActiveFrame.left + 3 + 1;
 253     pPreviewData->rcActiveClient.top = pPreviewData->rcActiveMenuBar.bottom; // + 1;
 254     pPreviewData->rcActiveClient.right = pPreviewData->rcActiveFrame.right - 3 - 1;
 255     pPreviewData->rcActiveClient.bottom = pPreviewData->rcActiveFrame.bottom - 3 - 1;
 256
 257     /* Calculate the active scroll rectangle */
 258     pPreviewData->rcActiveScroll.left = pPreviewData->rcActiveClient.right - 2 - 16;
 259     pPreviewData->rcActiveScroll.top = pPreviewData->rcActiveClient.top + 2;
 260     pPreviewData->rcActiveScroll.right = pPreviewData->rcActiveClient.right - 2;
 261     pPreviewData->rcActiveScroll.bottom = pPreviewData->rcActiveClient.bottom - 2;
 262
 263
 264     /* Dialog window */
 265     pPreviewData->rcDialogFrame.left = pPreviewData->rcActiveClient.left + 4;
 266     pPreviewData->rcDialogFrame.top = (pPreviewData->rcDesktop.bottom * 60) / 100;
 267     pPreviewData->rcDialogFrame.right = (pPreviewData->rcDesktop.right * 65) / 100;
 268     pPreviewData->rcDialogFrame.bottom = pPreviewData->rcDesktop.bottom - 5;
 269
 270     /* Calculate the dialog caption rectangle */
 271     pPreviewData->rcDialogCaption.left = pPreviewData->rcDialogFrame.left + 3;
 272     pPreviewData->rcDialogCaption.top = pPreviewData->rcDialogFrame.top + 3;
 273     pPreviewData->rcDialogCaption.right = pPreviewData->rcDialogFrame.right - 3;
 274     pPreviewData->rcDialogCaption.bottom = pPreviewData->rcDialogFrame.top + 20 + 1;
 275
 276     /* Calculate the inactive caption buttons rectangle */
 277     pPreviewData->rcDialogCaptionButtons.left = pPreviewData->rcDialogCaption.right - 2 - 16;
 278     pPreviewData->rcDialogCaptionButtons.top = pPreviewData->rcDialogCaption.top + 2;
 279     pPreviewData->rcDialogCaptionButtons.right = pPreviewData->rcDialogCaption.right - 2;
 280     pPreviewData->rcDialogCaptionButtons.bottom = pPreviewData->rcDialogCaption.bottom - 2;
 281
 282     /* Calculate the dialog client rectangle */
 283     pPreviewData->rcDialogClient.left = pPreviewData->rcDialogFrame.left + 3;
 284     pPreviewData->rcDialogClient.top = pPreviewData->rcDialogCaption.bottom + 1;
 285     pPreviewData->rcDialogClient.right = pPreviewData->rcDialogFrame.right - 3;
 286     pPreviewData->rcDialogClient.bottom = pPreviewData->rcDialogFrame.bottom - 3;
 287
 288     /* Calculate the dialog button rectangle */
 289     width = 80;
 290     height = 28;
 291
 292     pPreviewData->rcDialogButton.left =
 293         (pPreviewData->rcDialogClient.right + pPreviewData->rcDialogClient.left - width) / 2;
 294     pPreviewData->rcDialogButton.right = pPreviewData->rcDialogButton.left + width;
 295     pPreviewData->rcDialogButton.bottom = pPreviewData->rcDialogClient.bottom - 2;
 296     pPreviewData->rcDialogButton.top = pPreviewData->rcDialogButton.bottom - height;
 297 }
 298
 299
 300 static VOID
 301 OnPaint(HWND hwnd, PPREVIEW_DATA pPreviewData)
 302 {
 303     PAINTSTRUCT ps;
 304     HFONT hOldFont;
 305     HDC hdc;
 306     RECT rc;
 307
 308     hdc = BeginPaint(hwnd, &ps);
 309
 310     /* Desktop */
 311     FillRect(hdc, &pPreviewData->rcDesktop, pPreviewData->hbrDesktop);
 312
 313     /* Inactive Window */
 314     DrawEdge(hdc, &pPreviewData->rcInactiveFrame, EDGE_RAISED, BF_RECT | BF_MIDDLE);
 315     SetTextColor(hdc, pPreviewData->clrInactiveCaptionText);
 316     DrawCaptionTemp(NULL, hdc, &pPreviewData->rcInactiveCaption,  pPreviewData->hCaptionFont,
 317                     NULL, pPreviewData->lpInAct, DC_GRADIENT | DC_ICON | DC_TEXT);
 318     DrawCaptionButtons(hdc, &pPreviewData->rcInactiveCaption, TRUE);
 319
 320     /* Active Window */
 321     DrawEdge(hdc, &pPreviewData->rcActiveFrame, EDGE_RAISED, BF_RECT | BF_MIDDLE);
 322     SetTextColor(hdc, pPreviewData->clrActiveCaptionText);
 323     DrawCaptionTemp(NULL, hdc, &pPreviewData->rcActiveCaption, pPreviewData->hCaptionFont,
 324                     NULL, pPreviewData->lpAct, DC_ACTIVE | DC_GRADIENT | DC_ICON | DC_TEXT);
 325     DrawCaptionButtons(hdc, &pPreviewData->rcActiveCaption, TRUE);
 326
 327     /* FIXME: Draw the menu bar */
 328     DrawMenuBarTemp(hwnd, hdc, &pPreviewData->rcActiveMenuBar,
 329                     pPreviewData->hMenu /*HMENU hMenu*/,
 330                     pPreviewData->hMessageFont /*HFONT hFont*/);
 331
 332     /* Draw the client area */
 333     CopyRect(&rc, &pPreviewData->rcActiveClient);
 334     DrawEdge(hdc, &rc, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
 335     FillRect(hdc, &rc, pPreviewData->hbrWindow);
 336
 337     /* Draw the client text */
 338     CopyRect(&rc, &pPreviewData->rcActiveClient);
 339     rc.left += 4;
 340     rc.top += 2;
 341     SetTextColor(hdc, pPreviewData->clrWindowText);
 342     hOldFont = SelectObject(hdc, pPreviewData->hMessageFont);
 343     DrawText(hdc, pPreviewData->lpWinTxt, lstrlen(pPreviewData->lpWinTxt), &rc, DT_LEFT);
 344     SelectObject(hdc, hOldFont);
 345
 346     /* Draw the scroll bar */
 347     DrawScrollbar(hdc, &pPreviewData->rcActiveScroll, pPreviewData->hbrScrollbar);
 348
 349     /* Dialog Window */
 350     DrawEdge(hdc, &pPreviewData->rcDialogFrame, EDGE_RAISED, BF_RECT | BF_MIDDLE);
 351     SetTextColor(hdc, pPreviewData->clrActiveCaptionText);
 352     DrawCaptionTemp(NULL, hdc, &pPreviewData->rcDialogCaption, pPreviewData->hCaptionFont,
 353                     NULL, pPreviewData->lpMessBox, DC_ACTIVE | DC_GRADIENT | DC_ICON | DC_TEXT);
 354     DrawCaptionButtons(hdc, &pPreviewData->rcDialogCaption, FALSE);
 355
 356     /* Draw the dialog text */
 357     CopyRect(&rc, &pPreviewData->rcDialogClient);
 358     rc.left += 4;
 359     rc.top += 2;
 360     SetTextColor(hdc, RGB(0,0,0));
 361     hOldFont = SelectObject(hdc, pPreviewData->hMessageFont);
 362     DrawText(hdc, pPreviewData->lpMessText, lstrlen(pPreviewData->lpMessText), &rc, DT_LEFT);
 363     SelectObject(hdc, hOldFont);
 364
 365     /* Draw Button */
 366     DrawFrameControl(hdc, &pPreviewData->rcDialogButton, DFC_BUTTON, DFCS_BUTTONPUSH);
 367     CopyRect(&rc, &pPreviewData->rcDialogButton);
 368     SetTextColor(hdc, pPreviewData->clrButtonText);
 369     hOldFont = SelectObject(hdc, pPreviewData->hMessageFont);
 370     DrawText(hdc, pPreviewData->lpButText, lstrlen(pPreviewData->lpButText), &rc, DT_VCENTER | DT_CENTER | DT_SINGLELINE);
 371     SelectObject(hdc, hOldFont);
 372
 373     EndPaint(hwnd, &ps);
 374 }
 375
 376
 377 static VOID
 378 OnLButtonDown(HWND hwnd, int xPos, int yPos, PPREVIEW_DATA pPreviewData)
 379 {
 380     UINT type = IDX_DESKTOP;
 381     POINT pt;
 382
 383     pt.x = xPos;
 384     pt.y = yPos;
 385
 386     if (PtInRect(&pPreviewData->rcInactiveFrame, pt))
 387         type = IDX_INACTIVE_BORDER;
 388
 389     if (PtInRect(&pPreviewData->rcInactiveCaption, pt))
 390         type = IDX_INACTIVE_CAPTION;
 391
 392     if (PtInRect(&pPreviewData->rcInactiveCaptionButtons, pt))
 393         type = IDX_CAPTION_BUTTON;
 394
 395     if (PtInRect(&pPreviewData->rcActiveFrame, pt))
 396         type = IDX_ACTIVE_BORDER;
 397
 398     if (PtInRect(&pPreviewData->rcActiveCaption, pt))
 399         type = IDX_ACTIVE_CAPTION;
 400
 401     if (PtInRect(&pPreviewData->rcActiveCaptionButtons, pt))
 402         type = IDX_CAPTION_BUTTON;
 403
 404     if (PtInRect(&pPreviewData->rcActiveMenuBar, pt))
 405         type = IDX_MENU;
 406
 407 //    if (PtInRect(&pPreviewData->rcSelectedMenuItem, pt))
 408 //        type = IDX_SELECTION;
 409
 410     if (PtInRect(&pPreviewData->rcActiveClient, pt))
 411         type = IDX_WINDOW;
 412
 413     if (PtInRect(&pPreviewData->rcActiveScroll, pt))
 414         type = IDX_SCROLLBAR;
 415
 416     if (PtInRect(&pPreviewData->rcDialogFrame, pt))
 417         type = IDX_DIALOG;
 418
 419     if (PtInRect(&pPreviewData->rcDialogCaption, pt))
 420         type = IDX_ACTIVE_CAPTION;
 421
 422     if (PtInRect(&pPreviewData->rcDialogCaptionButtons, pt))
 423         type = IDX_CAPTION_BUTTON;
 424
 425     if (PtInRect(&pPreviewData->rcDialogButton, pt))
 426         type = IDX_3D_OBJECTS;
 427
 428     SendMessage(GetParent(hwnd), WM_USER, 0, type);
 429 }
 430
 431
 432 static VOID
 433 OnDestroy(PPREVIEW_DATA pPreviewData)
 434 {
 435     DeleteObject(pPreviewData->hbrScrollbar);
 436     DeleteObject(pPreviewData->hbrDesktop);
 437     DeleteObject(pPreviewData->hbrWindow);
 438
 439     DeleteObject(pPreviewData->hCaptionFont);
 440     DeleteObject(pPreviewData->hMenuFont);
 441     DeleteObject(pPreviewData->hMessageFont);
 442
 443     DestroyMenu(pPreviewData->hMenu);
 444
 445     LocalFree((HLOCAL)pPreviewData->lpInAct);
 446     LocalFree((HLOCAL)pPreviewData->lpAct);
 447     LocalFree((HLOCAL)pPreviewData->lpWinTxt);
 448     LocalFree((HLOCAL)pPreviewData->lpMessBox);
 449     LocalFree((HLOCAL)pPreviewData->lpMessText);
 450     LocalFree((HLOCAL)pPreviewData->lpButText);
 451 }
 452
 453
 454 static LRESULT CALLBACK
 455 PreviewWndProc(HWND hwnd,
 456                UINT uMsg,
 457                WPARAM wParam,
 458                LPARAM lParam)
 459 {
 460     PPREVIEW_DATA pPreviewData;
 461
 462     pPreviewData = (PPREVIEW_DATA)GetWindowLongPtr(hwnd, GWLP_USERDATA);
 463
 464     switch (uMsg)
 465     {
 466         case WM_CREATE:
 467             pPreviewData = (PPREVIEW_DATA)HeapAlloc(GetProcessHeap(),
 468                                                     HEAP_ZERO_MEMORY,
 469                                                     sizeof(PREVIEW_DATA));
 470             if (!pPreviewData)
 471                 return -1;
 472
 473             SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR)pPreviewData);
 474             OnCreate(hwnd, pPreviewData);
 475             break;
 476
 477         case WM_SIZE:
 478             OnSize(LOWORD(lParam), HIWORD(lParam), pPreviewData);
 479             break;
 480
 481         case WM_PAINT:
 482             OnPaint(hwnd, pPreviewData);
 483             break;
 484
 485         case WM_LBUTTONDOWN:
 486             OnLButtonDown(hwnd, LOWORD(lParam), HIWORD(lParam), pPreviewData);
 487             break;
 488
 489         case WM_DESTROY:
 490             OnDestroy(pPreviewData);
 491             HeapFree(GetProcessHeap(), 0, pPreviewData);
 492             break;
 493
 494         default:
 495             DefWindowProc(hwnd,
 496                           uMsg,
 497                           wParam,
 498                           lParam);
 499     }
 500
 501     return TRUE;
 502 }
 503
 504
 505 BOOL
 506 RegisterPreviewControl(IN HINSTANCE hInstance)
 507 {
 508     WNDCLASSEX wc = {0};
 509
 510     wc.cbSize = sizeof(WNDCLASSEX);
 511     wc.lpfnWndProc = PreviewWndProc;
 512     wc.hInstance = hInstance;
 513     wc.hCursor = LoadCursor(NULL, IDC_ARROW);
 514     wc.hbrBackground = (HBRUSH)NULL; //(COLOR_BTNFACE + 1);
 515     wc.lpszClassName = szPreviewWndClass;
 516
 517     return RegisterClassEx(&wc) != (ATOM)0;
 518 }
 519
 520
 521 VOID
 522 UnregisterPreviewControl(IN HINSTANCE hInstance)
 523 {
 524     UnregisterClass(szPreviewWndClass,
 525                     hInstance);
 526 }