rostests/tests/wm_paint/wm_paint.c

   1
   2 // ------------------------------------------------------------------
   3 // Windows 2000 Graphics API Black Book
   4 // Chapter 1 - Listing 1.1 (WM_PAINT Demo)
   5 //
   6 // Created by Damon Chandler <dmc27@ee.cornell.edu>
   7 // Updates can be downloaded at: <www.coriolis.com>
   8 //
   9 // Please do not hesistate to e-mail me at dmc27@ee.cornell.edu
  10 // if you have any questions about this code.
  11 // ------------------------------------------------------------------
  12
  13
  14 //>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
  15 #include <windows.h>
  16 #include <string.h>
  17 //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
  18
  19
  20 const char* WndClassName = "GMainWnd";
  21 LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
  22    LPARAM LParam);
  23
  24
  25 int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
  26     LPTSTR lpCmdLine, int nCmdShow)
  27 {
  28    MSG msg;
  29    WNDCLASS wc;
  30    memset(&wc, 0, sizeof(WNDCLASS));
  31
  32    wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
  33    wc.lpfnWndProc = MainWndProc;
  34    wc.hInstance = HInstance;
  35    wc.hCursor = LoadCursor(NULL, (LPCTSTR)IDC_ARROW);
  36    wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
  37    wc.lpszClassName = WndClassName;
  38
  39    if (RegisterClass(&wc))
  40    {
  41       HWND HWnd =
  42          CreateWindow(WndClassName, TEXT("WM_PAINT Demo"),
  43                       WS_OVERLAPPEDWINDOW | WS_CAPTION | WS_VISIBLE,
  44                       CW_USEDEFAULT, CW_USEDEFAULT, 200, 150,
  45                       NULL, NULL, HInstance, NULL);
  46
  47       if (HWnd)
  48       {
  49          ShowWindow(HWnd, nCmdShow);
  50          UpdateWindow(HWnd);
  51
  52          while (GetMessage(&msg, NULL, 0, 0))
  53          {
  54              TranslateMessage(&msg);
  55              DispatchMessage(&msg);
  56          }
  57       }
  58     }
  59     return 0;
  60 }
  61 //------------------------------------------------------------------
  62
  63
  64 LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
  65    LPARAM LParam)
  66 {
  67   const char* text = "Persistent Text";
  68
  69    switch (Msg)
  70    {
  71       case WM_PAINT:
  72       {
  73          // determine the invalidated area of the window
  74          RECT RUpdate;
  75          HDC Hdc;
  76          GetUpdateRect(HWnd, &RUpdate, FALSE);
  77
  78          // grab a handle to our window's
  79          // common display device context
  80          Hdc = GetDC(HWnd);
  81 #if 0
  82          try
  83 #endif
  84          {
  85             RECT RClient;
  86             GetClientRect(HWnd, &RClient);
  87
  88             // set the clipping region
  89             IntersectClipRect(Hdc, RUpdate.left, RUpdate.top,
  90                               RUpdate.right, RUpdate.bottom);
  91
  92             // fill the client area with the background brush
  93             /*HBRUSH HBrush =
  94                reinterpret_cast<HBRUSH>
  95                   (HBRUSH)(GetClassLong(HWnd, GCL_HBRBACKGROUND)
  96                   );*/
  97             FillRect(Hdc, &RClient, NULL);
  98
  99             // render the persistent text
 100             SetTextColor(Hdc, PALETTERGB(0, 0, 255));
 101             DrawText(Hdc, text, strlen(text), &RClient,
 102                      DT_CENTER | DT_VCENTER | DT_SINGLELINE);
 103          }
 104 #if 0
 105          catch (...)
 106 #endif
 107          {
 108             // release the device context
 109             ReleaseDC(HWnd, Hdc);
 110
 111             // validate the update area
 112             ValidateRect(HWnd, &RUpdate);
 113          }
 114          // release the device context
 115          ReleaseDC(HWnd, Hdc);
 116
 117          // validate the update area
 118          ValidateRect(HWnd, &RUpdate);
 119
 120          break;
 121       }
 122       case WM_DESTROY:
 123       {
 124          PostQuitMessage(0);
 125          return 0;
 126       }
 127    }
 128    return DefWindowProc(HWnd, Msg, WParam, LParam);
 129 }
 130 //------------------------------------------------------------------
 131