MFC Windows 程序设计之取色器

/** * ColorPicker.cpp : Contains all fundamental espects of the application. * Copyright (c) 2002, Li Zhaoming */ #include "stdafx.h" #include "resource.h" #define MAX_LOADSTRING 100 // Current instance HINSTANCE hinstance; // String buffers TCHAR szTitle[MAX_LOADSTRING]; TCHAR szWindowClass[MAX_LOADSTRING]; // Foreground and background colors DWORD g_fgColor = 0xff0000; DWORD g_bgColor = 0x00ff00; // Pre-defined font struct LOGFONT g_logFont = {80, 0, 0, 0, 0, false, false, false, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY, DEFAULT_PITCH, "Arial Black"}; // Basic colors in color dialogbox. DWORD g_crItems[] = { RGB( 0, 0, 0), RGB( 64, 0, 0), RGB(128, 0, 0), RGB(128, 64, 64), RGB(255, 0, 0), RGB(255, 128, 128), RGB(255, 255, 128), RGB(255, 255, 0), RGB(255, 128, 64), RGB(255, 128, 0), RGB(128, 64, 0), RGB(128, 128, 0), RGB(128, 128, 64), RGB( 0, 64, 0), RGB( 0, 128, 0), RGB( 0, 255, 0), RGB(128, 255, 0), RGB(128, 255, 128), RGB( 0, 255, 128), RGB( 0, 255, 64), RGB( 0, 128, 128), RGB( 0, 128, 64), RGB( 0, 64, 64), RGB(128, 128, 128), RGB( 64, 128, 128), RGB( 0, 0, 128), RGB( 0, 0, 255), RGB( 0, 64, 128), RGB( 0, 255, 255), RGB(128, 255, 255), RGB( 0, 128, 255), RGB( 0, 128, 192), RGB(128, 128, 255), RGB( 0, 0, 160), RGB( 0, 0, 64), RGB(192, 192, 192), RGB( 64, 0, 64), RGB( 64, 0, 64), RGB(128, 0, 128), RGB(128, 0, 64), RGB(128, 128, 192), RGB(255, 128, 192), RGB(255, 128, 255), RGB(255, 0, 255), RGB(255, 0, 128), RGB(128, 0, 255), RGB( 64, 0, 128), RGB(255, 255, 255), }; // Foward declarations of functions. ATOM MyRegisterClass(HINSTANCE hinstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM); LRESULT CALLBACK foreground(HWND, UINT, WPARAM, LPARAM); LRESULT CALLBACK background(HWND, UINT, WPARAM, LPARAM); /** * Entry point of the application. */ int APIENTRY WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { MSG msg; HACCEL hAccelTable; // Initialize global strings LoadString(hinstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); LoadString(hinstance, IDC_COLORPICKER, szWindowClass, MAX_LOADSTRING); MyRegisterClass(hinstance); // Perform application initialization: if (!InitInstance (hinstance, nCmdShow)) { return FALSE; } hAccelTable = LoadAccelerators(hinstance, (LPCTSTR)IDC_COLORPICKER); // Main message loop: while (GetMessage(&msg, NULL, 0, 0)) { if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return msg.wParam; } /** * FUNCTION: MyRegisterClass() * PURPOSE: Registers the window class. * COMMENTS: * This function and its usage is only necessary if you want this code * to be compatible with Win32 systems prior to the 'RegisterClassEx' * function that was added to Windows 95. It is important to call this function * so that the application will get 'well formed' small icons associated * with it. */ ATOM MyRegisterClass(HINSTANCE hinstance) { WNDCLASS wc; wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = (WNDPROC)WndProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hinstance; wc.hIcon = LoadIcon(hinstance, (LPCTSTR)IDI_COLORPICKER); wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wc.lpszMenuName = (LPCSTR)IDC_COLORPICKER; wc.lpszClassName = szWindowClass; return RegisterClass(&wc); } /** * FUNCTION: InitInstance(HANDLE, int) * PURPOSE: Saves instance handle and creates main window * COMMENTS: * In this function, we save the instance handle in a global variable and * create and display the main program window. */ BOOL InitInstance(HINSTANCE hinstance, int nCmdShow) { HWND hwnd; hinstance = hinstance; // Store instance handle in our global variable hwnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hinstance, NULL); if (!hwnd) { return FALSE; } ShowWindow(hwnd, nCmdShow); UpdateWindow(hwnd); return TRUE; } /* * FUNCTION: WndProc(HWND, unsigned, WORD, LONG) * PURPOSE: Processes messages for the main window. * WM_COMMAND - process the application menu * WM_PAINT - Paint the main window * WM_DESTROY - post a quit message and return */ LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lparam) { int wmId, wmEvent; PAINTSTRUCT ps; HDC hdc; TCHAR szHello[MAX_LOADSTRING]; LoadString(hinstance, IDS_HELLO, szHello, MAX_LOADSTRING); HFONT hfont; HBRUSH hbrush; HGDIOBJ hobject; switch (message) { case WM_CREATE: break; case WM_COMMAND: wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); // Parse the menu selections: switch (wmId) { case IDM_FOREGROUND: DialogBox(hinstance, (LPCTSTR)IDD_FOREGROUND, hwnd, (DLGPROC) foreground); break; case IDM_BACKGROUND: DialogBox(hinstance, (LPCTSTR)IDD_BACKGROUND, hwnd, (DLGPROC) background); break; case IDM_ABOUT: DialogBox(hinstance, (LPCTSTR)IDD_ABOUTBOX, hwnd, (DLGPROC)About); break; case IDM_EXIT: DestroyWindow(hwnd); break; default: return DefWindowProc(hwnd, message, wParam, lparam); } break; case WM_PAINT: RECT rt; GetClientRect(hwnd, &rt); hdc = BeginPaint(hwnd, &ps); hbrush = CreateSolidBrush(g_bgColor); FillRect(hdc, &rt, hbrush); hfont = CreateFontIndirect(&g_logFont); hobject = SelectObject(hdc, hfont); SetTextColor(hdc, g_fgColor); SetBkMode(hdc,TRANSPARENT); DrawText(hdc, szHello, strlen(szHello), &rt, DT_SINGLELINE | DT_CENTER | DT_VCENTER); SelectObject(hdc, hobject); EndPaint(hwnd, &ps); break; case WM_GETMINMAXINFO: LPMINMAXINFO lpinfo; lpinfo = (LPMINMAXINFO) lparam; lpinfo->ptMaxTrackSize.x = 500; lpinfo->ptMaxTrackSize.y = 400; break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hwnd, message, wParam, lparam); } return 0; } /** * Callback function of "Foreground color" dialog box. */ LRESULT CALLBACK foreground(HWND hdlg, UINT message, WPARAM wParam, LPARAM lparam) { switch (message) { case WM_INITDIALOG: int nColor; for (nColor = 0; nColor < sizeof(g_crItems)/sizeof(DWORD); nColor++) { SendDlgItemMessage(hdlg, IDC_FOREGROUND, CB_ADDSTRING, 0, (LPARAM) g_crItems[nColor]); if (g_fgColor == g_crItems[nColor]) SendDlgItemMessage(hdlg, IDC_FOREGROUND, CB_SETCURSEL, nColor, 0); } return TRUE; case WM_MEASUREITEM: LPMEASUREITEMSTRUCT lpmis; lpmis = (LPMEASUREITEMSTRUCT) lparam; lpmis->itemWidth = 10; lpmis->itemHeight = 22; break; case WM_DRAWITEM: HDC hdc; RECT rc; COLORREF cr; HBRUSH hbrush, hbrHighlight, hbrBackground; DRAWITEMSTRUCT * pdis; pdis = (DRAWITEMSTRUCT *)lparam; hdc = pdis->hDC; rc = pdis->rcItem; // NULL object ? if (pdis->itemData == -1) return 0; // Brushes. hbrHighlight = CreateSolidBrush(0xFFFFFF - g_bgColor); hbrBackground = CreateSolidBrush(g_bgColor); switch (pdis->itemAction) { case ODA_DRAWENTIRE: switch (pdis->CtlID) { case IDC_FOREGROUND: rc = pdis->rcItem; cr = (COLORREF) pdis->itemData; FillRect(hdc, &rc, hbrBackground); InflateRect(&rc, -1, -1); hbrush = CreateSolidBrush((COLORREF)cr); FillRect(hdc, &rc, hbrush); DeleteObject(hbrush); FrameRect(hdc, &rc, (HBRUSH) GetStockObject(WHITE_BRUSH)); break; } // *** FALL THROUGH *** case ODA_SELECT: rc = pdis->rcItem; if (pdis->itemState & ODS_SELECTED) h