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- /*------------------------------------------
- ABOUT2.C -- About Box Demo Program No. 2
- (c) Charles Petzold, 1996
- ------------------------------------------*/
-
- #include <windows.h>
- #include "about2.h"
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
- BOOL CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;
-
- int iCurrentColor = IDD_BLACK,
- iCurrentFigure = IDD_RECT ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- static char szAppName[] = "About2" ;
- MSG msg ;
- HWND hwnd ;
- WNDCLASSEX wndclass ;
-
- wndclass.cbSize = sizeof (wndclass) ;
- wndclass.style = CS_HREDRAW | CS_VREDRAW ;
- wndclass.lpfnWndProc = WndProc ;
- wndclass.cbClsExtra = 0 ;
- wndclass.cbWndExtra = 0 ;
- wndclass.hInstance = hInstance ;
- wndclass.hIcon = LoadIcon (hInstance, szAppName) ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = szAppName ;
- wndclass.lpszClassName = szAppName ;
- wndclass.hIconSm = LoadIcon (hInstance, szAppName) ;
-
- RegisterClassEx (&wndclass) ;
-
- hwnd = CreateWindow (szAppName, "About Box Demo Program",
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT, CW_USEDEFAULT,
- CW_USEDEFAULT, CW_USEDEFAULT,
- NULL, NULL, hInstance, NULL) ;
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- return msg.wParam ;
- }
-
- void PaintWindow (HWND hwnd, int iColor, int iFigure)
- {
- static COLORREF crColor[8] = { RGB (0, 0, 0), RGB ( 0, 0, 255),
- RGB (0, 255, 0), RGB ( 0, 255, 255),
- RGB (255, 0, 0), RGB (255, 0, 255),
- RGB (255, 255, 0), RGB (255, 255, 255) } ;
- HBRUSH hBrush ;
- HDC hdc ;
- RECT rect ;
-
- hdc = GetDC (hwnd) ;
- GetClientRect (hwnd, &rect) ;
- hBrush = CreateSolidBrush (crColor[iColor - IDD_BLACK]) ;
- hBrush = (HBRUSH) SelectObject (hdc, hBrush) ;
-
- if (iFigure == IDD_RECT)
- Rectangle (hdc, rect.left, rect.top, rect.right, rect.bottom) ;
- else
- Ellipse (hdc, rect.left, rect.top, rect.right, rect.bottom) ;
-
- DeleteObject (SelectObject (hdc, hBrush)) ;
- ReleaseDC (hwnd, hdc) ;
- }
-
- void PaintTheBlock (HWND hCtrl, int iColor, int iFigure)
- {
- InvalidateRect (hCtrl, NULL, TRUE) ;
- UpdateWindow (hCtrl) ;
- PaintWindow (hCtrl, iColor, iFigure) ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
- {
- static HINSTANCE hInstance ;
- PAINTSTRUCT ps ;
-
- switch (iMsg)
- {
- case WM_CREATE :
- hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
- return 0 ;
-
- case WM_COMMAND :
- switch (LOWORD (wParam))
- {
- case IDM_ABOUT :
- if (DialogBox (hInstance, "AboutBox", hwnd,
- AboutDlgProc))
- InvalidateRect (hwnd, NULL, TRUE) ;
- return 0 ;
- }
- break ;
-
- case WM_PAINT :
- BeginPaint (hwnd, &ps) ;
- EndPaint (hwnd, &ps) ;
-
- PaintWindow (hwnd, iCurrentColor, iCurrentFigure) ;
- return 0 ;
-
- case WM_DESTROY :
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
- }
-
- BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT iMsg, WPARAM wParam, LPARAM lParam)
- {
- static HWND hCtrlBlock ;
- static int iColor, iFigure ;
-
- switch (iMsg)
- {
- case WM_INITDIALOG :
- iColor = iCurrentColor ;
- iFigure = iCurrentFigure ;
-
- CheckRadioButton (hDlg, IDD_BLACK, IDD_WHITE, iColor) ;
- CheckRadioButton (hDlg, IDD_RECT, IDD_ELL, iFigure) ;
-
- hCtrlBlock = GetDlgItem (hDlg, IDD_PAINT) ;
-
- SetFocus (GetDlgItem (hDlg, iColor)) ;
- return FALSE ;
-
- case WM_COMMAND :
- switch (LOWORD (wParam))
- {
- case IDOK :
- iCurrentColor = iColor ;
- iCurrentFigure = iFigure ;
- EndDialog (hDlg, TRUE) ;
- return TRUE ;
-
- case IDCANCEL :
- EndDialog (hDlg, FALSE) ;
- return TRUE ;
-
- case IDD_BLACK :
- case IDD_RED :
- case IDD_GREEN :
- case IDD_YELLOW :
- case IDD_BLUE :
- case IDD_MAGENTA :
- case IDD_CYAN :
- case IDD_WHITE :
- iColor = LOWORD (wParam) ;
- CheckRadioButton (hDlg, IDD_BLACK, IDD_WHITE, LOWORD (wParam)) ;
- PaintTheBlock (hCtrlBlock, iColor, iFigure) ;
- return TRUE ;
-
- case IDD_RECT :
- case IDD_ELL :
- iFigure = LOWORD (wParam) ;
- CheckRadioButton (hDlg, IDD_RECT, IDD_ELL, LOWORD (wParam)) ;
- PaintTheBlock (hCtrlBlock, iColor, iFigure) ;
- return TRUE ;
- }
- break ;
-
- case WM_PAINT :
- PaintTheBlock (hCtrlBlock, iColor, iFigure) ;
- break ;
- }
- return FALSE ;
- }
-