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A Multiple Document Interface (MDI)
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This is an example of an MDI. |
#define IDR_MAIN_MENU 101
#define IDM_FILE_NEW 40001
#define IDM_FILE_CLOSE 40002
#define IDM_FILE_EXIT 40003
#define IDM_WINDOW_TILE 40004
#define IDM_WINDOW_CASCADE 40005
#define IDM_WINDOW_ICONS 40006
#define IDM_WINDOW_CLOSE_ALL 40007
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#include "resource.h"
/////////////////////////////////////////////////////////////////////////////
//
// Menu
//
IDR_MAIN_MENU MENU
BEGIN
POPUP "&File"
BEGIN
MENUITEM "&New\tCtrl+N", 40001
MENUITEM SEPARATOR
MENUITEM "&Close", 40002
MENUITEM SEPARATOR
MENUITEM "E&xit", 40003
END
POPUP "&Window"
BEGIN
MENUITEM "&Tile", 40004
MENUITEM "C&ascade", 40005
MENUITEM "Arrange &Icons", 40006
MENUITEM "Cl&ose All", 40007
END
END
/////////////////////////////////////////////////////////////////////////////
//
// String Table
//
STRINGTABLE
BEGIN
IDM_FILE_NEW "Creates a new document\nNew"
IDM_FILE_CLOSE "Closes the current document\nClose"
IDM_FILE_EXIT "Closes the application\nExit"
IDM_WINDOW_TILE "Arranges child windows in a tile format"
IDM_WINDOW_CASCADE "Arranges child windows in a cascade format"
IDM_WINDOW_ICONS "Arranges the icons of minimized child windows"
IDM_WINDOW_CLOSE_ALL "Closes all child windows"
END
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#include <windows.h>
#include "resource.h"
const char MainClassName[] = "MainMDIWnd";
const char ChildClassName[] = "MDIChildWnd";
const int StartChildrenNo = 994;
HWND hWndMainFrame = NULL;
HWND hWndChildFrame = NULL;
BOOL CreateNewDocument(HINSTANCE hInstance);
LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam);
BOOL CreateNewDocument(HINSTANCE hInstance);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX WndClsEx;
MSG Msg;
WndClsEx.cbSize = sizeof(WNDCLASSEX);
WndClsEx.style = 0;
WndClsEx.lpfnWndProc = MainWndProc;
WndClsEx.cbClsExtra = 0;
WndClsEx.cbWndExtra = 0;
WndClsEx.hInstance = hInstance;
WndClsEx.hIcon = LoadIcon(NULL, IDI_ASTERISK);
WndClsEx.hCursor = LoadCursor(NULL, IDC_ARROW);
WndClsEx.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
WndClsEx.lpszMenuName = MAKEINTRESOURCE(IDR_MAIN_MENU);
WndClsEx.lpszClassName = MainClassName;
WndClsEx.hIconSm = LoadIcon(NULL, IDI_ASTERISK);
if(!RegisterClassEx(&WndClsEx))
{
MessageBox(NULL,
"Window Registration Failed!", "Error!",
MB_OK);
return 0;
}
if( !CreateNewDocument(hInstance) )
return 0;
hWndMainFrame = CreateWindowEx(0L,
MainClassName,
"Multiple Document Application",
WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
if(hWndMainFrame == NULL)
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
ShowWindow(hWndMainFrame, nCmdShow);
UpdateWindow(hWndMainFrame);
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
if (!TranslateMDISysAccel(hWndChildFrame, &Msg))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
}
return 0;
}
HWND CreateNewMDIChild(HWND hMDIClient)
{
MDICREATESTRUCT mcs;
HWND NewWnd;
mcs.szTitle = "Untitled";
mcs.szClass = ChildClassName;
mcs.hOwner = GetModuleHandle(NULL);
mcs.x = mcs.cx = CW_USEDEFAULT;
mcs.y = mcs.cy = CW_USEDEFAULT;
mcs.style = MDIS_ALLCHILDSTYLES;
NewWnd = (HWND)SendMessage(hMDIClient, WM_MDICREATE, 0, (LONG)&mcs);
if( !NewWnd )
{
MessageBox(NULL,
"Error creaing child window",
"Creation Error",
MB_OK);
}
return NewWnd;
}
LRESULT CALLBACK MainWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
switch(Msg)
{
case WM_CREATE:
{
CLIENTCREATESTRUCT ccs;
ccs.hWindowMenu = GetSubMenu(GetMenu(hWnd), 2);
ccs.idFirstChild = StartChildrenNo;
hWndChildFrame = CreateWindowEx(WS_EX_CLIENTEDGE,
"MDICLIENT",
NULL,
WS_CHILD | WS_CLIPCHILDREN | WS_VSCROLL
| WS_HSCROLL | WS_VISIBLE,
CW_USEDEFAULT,
CW_USEDEFAULT,
680,
460,
hWnd,
(HMENU)IDM_FILE_NEW,
GetModuleHandle(NULL),
(LPVOID)&ccs);
if(hWndChildFrame == NULL)
MessageBox(hWnd, "Could not create MDI client.", "Error", MB_OK | MB_ICONERROR);
}
CreateNewMDIChild(hWndChildFrame);
break;
case WM_SIZE:
{
HWND hWndMDI;
RECT rctClient;
GetClientRect(hWnd, &rctClient);
hWndMDI = GetDlgItem(hWnd, IDM_FILE_NEW);
SetWindowPos(hWndMDI, NULL, 0, 0, rctClient.right, rctClient.bottom, SWP_NOZORDER);
}
break;
case WM_CLOSE:
DestroyWindow(hWnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDM_FILE_NEW:
CreateNewMDIChild(hWndChildFrame);
break;
case IDM_FILE_CLOSE:
{
HWND hChild = (HWND)SendMessage(hWndChildFrame, WM_MDIGETACTIVE,0,0);
if(hChild)
{
SendMessage(hChild, WM_CLOSE, 0, 0);
}
}
break;
case IDM_FILE_EXIT:
PostMessage(hWnd, WM_CLOSE, 0, 0);
break;
case IDM_WINDOW_TILE:
SendMessage(hWndChildFrame, WM_MDITILE, 0, 0);
break;
case IDM_WINDOW_CASCADE:
SendMessage(hWndChildFrame, WM_MDICASCADE, 0, 0);
break;
case IDM_WINDOW_ICONS:
SendMessage(hWndChildFrame, WM_MDIICONARRANGE, 0, 0);
break;
case IDM_WINDOW_CLOSE_ALL:
{
HWND hWndCurrent;
do {
hWndCurrent = (HWND)SendMessage(hWndChildFrame, WM_MDIGETACTIVE,0,0);
SendMessage(hWndCurrent, WM_CLOSE, 0, 0);
}while(hWndCurrent);
}
break;
default:
{
if(LOWORD(wParam) >= StartChildrenNo)
{
DefFrameProc(hWnd, hWndChildFrame, WM_COMMAND, wParam, lParam);
}
else
{
HWND hWndCurrent = (HWND)SendMessage(hWndChildFrame, WM_MDIGETACTIVE,0,0);
if( hWndCurrent )
{
SendMessage(hWndCurrent, WM_COMMAND, wParam, lParam);
}
}
}
}
break;
default:
return DefFrameProc(hWnd, hWndChildFrame, Msg, wParam, lParam);
}
return 0;
}
LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
break;
case WM_MDIACTIVATE:
{
HMENU hMenu, hFileMenu;
UINT EnableFlag;
hMenu = GetMenu(hWndMainFrame);
if(hwnd == (HWND)lParam)
{
EnableFlag = MF_ENABLED;
}
else
{
EnableFlag = MF_GRAYED;
}
EnableMenuItem(hMenu, 1, MF_BYPOSITION | EnableFlag);
EnableMenuItem(hMenu, 2, MF_BYPOSITION | EnableFlag);
hFileMenu = GetSubMenu(hMenu, 0);
EnableMenuItem(hFileMenu, IDM_FILE_CLOSE, MF_BYCOMMAND | EnableFlag);
EnableMenuItem(hFileMenu, IDM_WINDOW_CLOSE_ALL, MF_BYCOMMAND | EnableFlag);
DrawMenuBar(hWndMainFrame);
}
break;
default:
return DefMDIChildProc(hwnd, msg, wParam, lParam);
}
return 0;
}
BOOL CreateNewDocument(HINSTANCE hInstance)
{
WNDCLASSEX WndClsEx;
WndClsEx.cbSize = sizeof(WNDCLASSEX);
WndClsEx.style = CS_HREDRAW | CS_VREDRAW;
WndClsEx.lpfnWndProc = ChildWndProc;
WndClsEx.cbClsExtra = 0;
WndClsEx.cbWndExtra = 0;
WndClsEx.hInstance = hInstance;
WndClsEx.hIcon = LoadIcon(NULL, IDI_WARNING);
WndClsEx.hCursor = LoadCursor(NULL, IDC_ARROW);
WndClsEx.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
WndClsEx.lpszMenuName = NULL;
WndClsEx.lpszClassName = ChildClassName;
WndClsEx.hIconSm = LoadIcon(NULL, IDI_WARNING);
if(!RegisterClassEx(&WndClsEx))
{
MessageBox(NULL,
"There was a problem when attempting to create a document",
"Application Error",
MB_OK);
return FALSE;
}
else
return TRUE;
}