reactos/rostests/tests/wm_paint/wm_paint.c

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// ------------------------------------------------------------------
// Windows 2000 Graphics API Black Book
// Chapter 1 - Listing 1.1 (WM_PAINT Demo)
//
// Created by Damon Chandler <dmc27@ee.cornell.edu>
// Updates can be downloaded at: <www.coriolis.com>
//
// Please do not hesistate to e-mail me at dmc27@ee.cornell.edu
// if you have any questions about this code.
// ------------------------------------------------------------------
//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
#include <windows.h>
#include <string.h>
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
const char* WndClassName = "GMainWnd";
LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
LPARAM LParam);
int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
LPTSTR lpCmdLine, int nCmdShow)
{
MSG msg;
WNDCLASS wc;
memset(&wc, 0, sizeof(WNDCLASS));
wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
wc.lpfnWndProc = MainWndProc;
wc.hInstance = HInstance;
wc.hCursor = LoadCursor(NULL, (LPCTSTR)IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
wc.lpszClassName = WndClassName;
if (RegisterClass(&wc))
{
HWND HWnd =
CreateWindow(WndClassName, TEXT("WM_PAINT Demo"),
WS_OVERLAPPEDWINDOW | WS_CAPTION | WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT, 200, 150,
NULL, NULL, HInstance, NULL);
if (HWnd)
{
ShowWindow(HWnd, nCmdShow);
UpdateWindow(HWnd);
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
return 0;
}
//------------------------------------------------------------------
LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
LPARAM LParam)
{
const char* text = "Persistent Text";
switch (Msg)
{
case WM_PAINT:
{
// determine the invalidated area of the window
RECT RUpdate;
HDC Hdc;
GetUpdateRect(HWnd, &RUpdate, FALSE);
// grab a handle to our window's
// common display device context
Hdc = GetDC(HWnd);
#if 0
try
#endif
{
RECT RClient;
GetClientRect(HWnd, &RClient);
// set the clipping region
IntersectClipRect(Hdc, RUpdate.left, RUpdate.top,
RUpdate.right, RUpdate.bottom);
// fill the client area with the background brush
/*HBRUSH HBrush =
reinterpret_cast<HBRUSH>
(HBRUSH)(GetClassLong(HWnd, GCL_HBRBACKGROUND)
);*/
FillRect(Hdc, &RClient, NULL);
// render the persistent text
SetTextColor(Hdc, PALETTERGB(0, 0, 255));
DrawText(Hdc, text, strlen(text), &RClient,
DT_CENTER | DT_VCENTER | DT_SINGLELINE);
}
#if 0
catch (...)
#endif
{
// release the device context
ReleaseDC(HWnd, Hdc);
// validate the update area
ValidateRect(HWnd, &RUpdate);
}
// release the device context
ReleaseDC(HWnd, Hdc);
// validate the update area
ValidateRect(HWnd, &RUpdate);
break;
}
case WM_DESTROY:
{
PostQuitMessage(0);
return 0;
}
}
return DefWindowProc(HWnd, Msg, WParam, LParam);
}
//------------------------------------------------------------------