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dbf0e6e889
svn path=/trunk/; revision=11360
180 lines
5.2 KiB
C++
180 lines
5.2 KiB
C++
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// ------------------------------------------------------------------
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// Windows 2000 Graphics API Black Book
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// Chapter 2 - CD-ROM (WM_ERASEBKGND Demo)
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//
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// Created by Damon Chandler <dmc27@ee.cornell.edu>
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// Updates can be downloaded at: <www.coriolis.com>
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//
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// Please do not hesistate to e-mail me at dmc27@ee.cornell.edu
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// if you have any questions about this code.
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// ------------------------------------------------------------------
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//*********************************************************//
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// //
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// SYNOPSIS: //
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// This sample project demonstrates how to render //
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// a background image in response to the WM_ERASEBKGND //
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// message. It also shows how to create a transparent //
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// static (text) control by handling the //
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// WM_CTLCOLORSTATIC message. //
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// //
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//*********************************************************//
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//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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#include <windows.h>
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//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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HINSTANCE HInst;
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HINSTANCE HPrevInst;
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TCHAR *cmdline;
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const char* WndClassName = "GMainWnd";
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LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
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LPARAM LParam);
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int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
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LPTSTR lpCmdLine, int nCmdShow)
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{
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HInst = HInstance;
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HPrevInst = HPrevInstance;
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cmdline = lpCmdLine;
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WNDCLASS wc;
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memset(&wc, 0, sizeof(WNDCLASS));
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wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
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wc.lpfnWndProc = MainWndProc;
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wc.hInstance = HInstance;
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wc.hCursor = LoadCursor(NULL, IDC_ARROW);
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wc.hbrBackground =
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reinterpret_cast<HBRUSH>(COLOR_BTNFACE + 1);
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wc.lpszClassName = WndClassName;
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if (RegisterClass(&wc))
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{
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HWND HWnd =
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CreateWindow(WndClassName,
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TEXT("WM_ERASEBKGND Demo"),
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WS_OVERLAPPEDWINDOW | WS_CAPTION |
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WS_VISIBLE | WS_CLIPSIBLINGS,
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CW_USEDEFAULT, CW_USEDEFAULT, 205, 85,
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NULL, NULL, HInstance, NULL);
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if (HWnd)
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{
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ShowWindow(HWnd, nCmdShow);
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UpdateWindow(HWnd);
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MSG msg;
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while (GetMessage(&msg, NULL, 0, 0))
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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}
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}
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return 0;
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}
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//------------------------------------------------------------------
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// static text and bitmap-related variables
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HWND HStatic;
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HDC HMemDC;
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HBITMAP HBmp, HOldBmp;
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const char* filename = "BACKBITMAP.BMP";
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LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
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LPARAM LParam)
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{
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switch (Msg)
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{
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case WM_CREATE:
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{
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HStatic =
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CreateWindow(TEXT("STATIC"), TEXT("Static Text"),
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WS_CHILD | WS_VISIBLE | SS_CENTER,
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10, 20, 175, 30,
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HWnd, NULL, HInst, NULL);
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// create a memory DC compatible with the screen
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HMemDC = CreateCompatibleDC(NULL);
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if (HMemDC)
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{
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// load a DDB from file
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HBmp = static_cast<HBITMAP>(
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LoadImage(HInst, filename, IMAGE_BITMAP,
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0, 0, LR_LOADFROMFILE)
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);
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if (HBmp)
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{
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// associate the DDB with the memory DC
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HOldBmp = static_cast<HBITMAP>(
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SelectObject(HMemDC, HBmp)
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);
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}
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}
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}
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case WM_CTLCOLORSTATIC:
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{
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if (reinterpret_cast<HWND>(LParam) == HStatic)
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{
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HDC HStaticDC = reinterpret_cast<HDC>(WParam);
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SetBkMode(HStaticDC, TRANSPARENT);
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return reinterpret_cast<LRESULT>(
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GetStockObject(NULL_BRUSH)
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);
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}
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break;
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}
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case WM_ERASEBKGND:
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{
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BITMAP bmp;
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if (GetObject(HBmp, sizeof(BITMAP), &bmp))
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{
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RECT RClient;
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GetClientRect(HWnd, &RClient);
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HDC Hdc = reinterpret_cast<HDC>(WParam);
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SetStretchBltMode(Hdc, COLORONCOLOR);
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//
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// TODO: add palette handling code for
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// palettized displays (see Chapter 9)...
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//
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// render the background image
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StretchBlt(Hdc, 0, 0,
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RClient.right - RClient.left,
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RClient.bottom - RClient.top,
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HMemDC, 0, 0, bmp.bmWidth, bmp.bmHeight,
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SRCCOPY);
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return TRUE;
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}
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break;
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}
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case WM_DESTROY:
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{
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if (HBmp)
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{
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// free the bitmap
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DeleteObject(SelectObject(HMemDC, HOldBmp));
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}
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// free the memory DC
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DeleteDC(HMemDC);
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PostQuitMessage(0);
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return 0;
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}
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}
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return DefWindowProc(HWnd, Msg, WParam, LParam);
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}
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//------------------------------------------------------------------
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