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144 lines
4.8 KiB
144 lines
4.8 KiB
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1994.
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//
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// File: cwindow.cxx
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//
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// Contents: implementation for a window class
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//
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// Classes: CHlprWindow
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//
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// Functions: WindowProc
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//
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// History: 4-12-94 stevebl Created
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//
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//----------------------------------------------------------------------------
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#include "cwindow.h"
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//+---------------------------------------------------------------------------
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//
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// Member: CHlprWindow::Create
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//
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// Synopsis: Special version of CreateWindow.
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//
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// Arguments: [lpszClassName] - address of registered class name
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// [lpszWindowName] - address of window name
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// [dwStyle] - window style
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// [x] - horizontal position of window
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// [y] - vertical position of window
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// [nWidth] - window width
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// [nHeight] - window height
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// [hwndParent] - handle of parent or owner window
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// [hmenu] - handle of menu, or child window identifier
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// [hinst] - handle of application instance
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//
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// Returns: HWND of the created window
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//
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// Modifies: _hwnd, _hInstance
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//
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// History: 4-12-94 stevebl Created
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//
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// Notes: The window class must have been previously registered (as
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// is normal Windows procedure) and the callback function
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// must have been registered as ::WindowProc. ::WindowProc will
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// then forward all messages on to the CHlprWindow::WindowProc
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// method, allowing the window to directly access class members
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// (i.e. giving the WindowProc access to the "this" pointer).
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//
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//----------------------------------------------------------------------------
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HWND CHlprWindow::Create(
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LPCTSTR lpszClassName,
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LPCTSTR lpszWindowName,
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DWORD dwStyle,
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int x,
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int y,
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int nWidth,
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int nHeight,
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HWND hwndParent,
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HMENU hmenu,
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HINSTANCE hinst)
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{
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_hInstance = hinst;
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return(_hwnd =
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CreateWindow(
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lpszClassName,
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lpszWindowName,
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dwStyle,
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x,
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y,
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nWidth,
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nHeight,
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hwndParent,
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hmenu,
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hinst,
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this));
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}
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//+---------------------------------------------------------------------------
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//
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// Function: WindowProc
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//
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// Synopsis: Standard WindowProc that forwards Windows messages on to the
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// CHlprWindow::WindowProc method.
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//
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// Arguments: [hwnd] - window handle
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// [uMsg] - message
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// [wParam] - first message parameter
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// [lParam] - second message parameter
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//
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// History: 4-12-94 stevebl Created
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//
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// Notes: This Window procedure expects that it will receive a "this"
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// pointer as the lpCreateParams member passed as part of the
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// WM_CREATE message. It saves the "this" pointer in the
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// GWL_USERDATA field of the window structure.
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//
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//----------------------------------------------------------------------------
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LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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CHlprWindow * pw;
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switch (uMsg)
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{
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case WM_CREATE:
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// Since this is the first time that we can get ahold of
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// a pointer to the window class object, all messages that might
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// have been sent before this are never seen by the Windows object
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// and only get passed on to te DefWindowProc
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// get a pointer to the window class object
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pw = (CHlprWindow *) ((CREATESTRUCT *)lParam)->lpCreateParams;
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// set its USERDATA DWORD to point to the class object
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SetWindowLong(hwnd, GWL_USERDATA, (long) pw);
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// Set it's protected _hwnd member variable to ensure that
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// member functions have access to the correct window handle.
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pw->_hwnd = hwnd;
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break;
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case WM_DESTROY:
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// This is our signal to destroy the window class object.
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pw = (CHlprWindow *) GetWindowLong(hwnd, GWL_USERDATA);
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SetWindowLong(hwnd, GWL_USERDATA, 0);
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delete pw;
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pw = (CHlprWindow *) 0;
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break;
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default:
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// get a pointer to the window class object
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pw = (CHlprWindow *) GetWindowLong(hwnd, GWL_USERDATA);
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break;
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}
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// and call its message proc method
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if (pw != (CHlprWindow *) 0)
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{
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return(pw->WindowProc(uMsg, wParam, lParam));
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}
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else
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{
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return(DefWindowProc(hwnd, uMsg, wParam, lParam));
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}
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}
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