mirror of
https://github.com/reactos/reactos.git
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259 lines
6.4 KiB
C
259 lines
6.4 KiB
C
/*
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* PROJECT: ReactOS Screen Saver Library
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* LICENSE: GPL v2 or any later version
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* FILE: lib/sdk/scrnsave/scrnsave.c
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* PURPOSE: Library for writing screen savers, compatible with MS' scrnsave.lib
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* PROGRAMMERS: Anders Norlander <anorland@hem2.passagen.se>
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* Colin Finck <mail@colinfinck.de>
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*/
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#include <stdarg.h>
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#include <windef.h>
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#include <winbase.h>
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#include <wingdi.h>
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#include <winuser.h>
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#include <tchar.h>
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#include <scrnsave.h>
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// Screen Saver window class
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#define CLASS_SCRNSAVE TEXT("WindowsScreenSaverClass")
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// Globals
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HWND hMainWindow = NULL;
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BOOL fChildPreview = FALSE;
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HINSTANCE hMainInstance;
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TCHAR szName[TITLEBARNAMELEN];
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TCHAR szAppName[APPNAMEBUFFERLEN];
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TCHAR szIniFile[MAXFILELEN];
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TCHAR szScreenSaver[22];
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TCHAR szHelpFile[MAXFILELEN];
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TCHAR szNoHelpMemory[BUFFLEN];
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UINT MyHelpMessage;
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// Local house keeping
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static POINT pt_orig;
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static int ISSPACE(TCHAR c)
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{
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return (c == ' ' || c == '\t');
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}
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#define ISNUM(c) ((c) >= '0' && c <= '9')
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static ULONG_PTR _toulptr(const TCHAR *s)
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{
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ULONG_PTR res;
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ULONG_PTR n;
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const TCHAR *p;
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for (p = s; *p; p++)
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if (!ISNUM(*p))
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break;
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p--;
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res = 0;
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for (n = 1; p >= s; p--, n *= 10)
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res += (*p - '0') * n;
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return res;
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}
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// This function takes care of *must* do tasks, like terminating screen saver
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static LRESULT WINAPI SysScreenSaverProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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switch(uMsg)
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{
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case WM_CREATE:
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// Mouse is not supposed to move from this position
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GetCursorPos(&pt_orig);
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break;
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case WM_DESTROY:
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PostQuitMessage(0);
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break;
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case WM_SYSCOMMAND:
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if (!fChildPreview)
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{
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switch (wParam)
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{
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case SC_CLOSE:
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case SC_SCREENSAVE:
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return FALSE;
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}
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}
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break;
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}
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return ScreenSaverProc(hWnd, uMsg, wParam, lParam);
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}
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LRESULT WINAPI DefScreenSaverProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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// Don't do any special processing when in preview mode
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if (fChildPreview)
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return DefWindowProc(hWnd, uMsg, wParam, lParam);
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switch (uMsg)
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{
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case WM_NCACTIVATE:
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case WM_ACTIVATE:
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case WM_ACTIVATEAPP:
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if (!wParam)
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{
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// wParam is FALSE, so the screensaver is losing the focus.
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PostMessage(hWnd, WM_CLOSE, 0, 0);
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}
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break;
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case WM_MOUSEMOVE:
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{
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POINT pt;
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GetCursorPos(&pt);
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if (pt.x == pt_orig.x && pt.y == pt_orig.y)
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break;
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// Fall through
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}
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case WM_LBUTTONDOWN:
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case WM_RBUTTONDOWN:
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case WM_MBUTTONDOWN:
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case WM_KEYDOWN:
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case WM_KEYUP:
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// Send a WM_CLOSE to close the screen saver (allows the screensaver author to do clean-up tasks)
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PostMessage(hWnd, WM_CLOSE, 0, 0);
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break;
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case WM_SETCURSOR:
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SetCursor(NULL);
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return TRUE;
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}
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return DefWindowProc(hWnd, uMsg, wParam, lParam);
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}
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// Registers the screen saver window class
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static BOOL RegisterScreenSaverClass(void)
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{
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WNDCLASS cls = {0,};
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cls.hIcon = LoadIcon(hMainInstance, MAKEINTATOM(ID_APP));
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cls.lpszClassName = CLASS_SCRNSAVE;
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cls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
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cls.hInstance = hMainInstance;
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cls.style = CS_VREDRAW | CS_HREDRAW | CS_SAVEBITS | CS_PARENTDC;
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cls.lpfnWndProc = (WNDPROC)SysScreenSaverProc;
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return RegisterClass(&cls) != 0;
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}
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static void LaunchConfig(void)
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{
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// Only show the dialog if the RegisterDialogClasses function succeeded.
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// This is the same behaviour as MS' scrnsave.lib.
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if( RegisterDialogClasses(hMainInstance) )
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DialogBox(hMainInstance, MAKEINTRESOURCE(DLG_SCRNSAVECONFIGURE), GetForegroundWindow(), (DLGPROC) ScreenSaverConfigureDialog);
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}
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static int LaunchScreenSaver(HWND hParent)
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{
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UINT style;
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RECT rc;
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MSG msg;
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if (!RegisterScreenSaverClass())
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{
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MessageBox(NULL, TEXT("RegisterClass() failed"), NULL, MB_ICONHAND);
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return 1;
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}
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// A slightly different approach needs to be used when displaying in a preview window
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if (hParent)
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{
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style = WS_CHILD;
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GetClientRect(hParent, &rc);
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}
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else
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{
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style = WS_POPUP;
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rc.right = GetSystemMetrics(SM_CXVIRTUALSCREEN);
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rc.bottom = GetSystemMetrics(SM_CYVIRTUALSCREEN);
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style |= WS_VISIBLE;
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}
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// Create the main screen saver window
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hMainWindow = CreateWindowEx(hParent ? 0 : WS_EX_TOPMOST, CLASS_SCRNSAVE,
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TEXT("SCREENSAVER"), style,
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0, 0, rc.right, rc.bottom, hParent, NULL,
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hMainInstance, NULL);
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if(!hMainWindow)
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return 1;
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// Display window and start pumping messages
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ShowWindow(hMainWindow, SW_SHOW);
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if (!hParent)
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SetCursor(NULL);
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while (GetMessage(&msg, NULL, 0, 0))
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DispatchMessage(&msg);
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return msg.wParam;
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}
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// Screen Saver entry point
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int APIENTRY _tWinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPTSTR CmdLine, int nCmdShow)
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{
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LPTSTR p;
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UNREFERENCED_PARAMETER(nCmdShow);
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UNREFERENCED_PARAMETER(hPrevInst);
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hMainInstance = hInst;
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// Parse the arguments
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for (p = CmdLine; *p; p++)
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{
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switch (*p)
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{
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case 'S':
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case 's':
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// Start the screen saver
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return LaunchScreenSaver(NULL);
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case 'P':
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case 'p':
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{
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// Start the screen saver in preview mode
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HWND hParent;
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fChildPreview = TRUE;
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while (ISSPACE(*++p));
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hParent = (HWND) _toulptr(p);
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if (hParent && IsWindow(hParent))
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return LaunchScreenSaver(hParent);
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}
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return 0;
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case 'C':
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case 'c':
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// Display the configuration dialog
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LaunchConfig();
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return 0;
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case '-':
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case '/':
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case ' ':
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default:
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break;
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}
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}
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LaunchConfig();
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return 0;
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}
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