lecture 10
DESCRIPTION
Lecture 10. Multiple Document Interface (MDI). MDI - introduction. User can work with more than one document at one time Each document is displayed in child window Each child window is contained within client area of application’s main window. MDI - windows. MDI - windows. - PowerPoint PPT PresentationTRANSCRIPT
Lecture 10
Multiple Document Interface (MDI)
MDI - introduction• User can work with more than one document at
one time
• Each document is displayed in child window
• Each child window is contained within client area of application’s main window
MDI - windows
MDI - windows• Frame window is main application window, it has
• sizing border
• title bar, window menu
• minimize and maximze buttons
• Frame window must be registered by application (by call to RegisterClass or RegisterClassEx)
MDI - windows• MDI client window
• uses predefined class MDICLIENT
• it serves as background for child windows
• it manages child windows, it can:
• create child window
• activate child window
• maximize and minimize child windows
• cascade and tile child windows
MDI - windows• MDI child window
• MDI child window has:
• sizing border
• title bar
• minimize, maximize buttons
• MDI child window class must be registered by application
MDI – window procedures• MDI application must register at least two
window classes and use two window procedures:
• for the frame window
• for the MDI child window
• Frame window procedure must call DefFrameProc instead of DefWindowProc
• MDI child window procedure must call DefMDIChildProc instead of DefWindowProc
MDI – step by step• Create frame window procedure
• Create MDI child window procedure
• Register frame window class
• Register MDI child window class
• Create main application window
• Create MDI client window
• Modify message loop and add call to TranslateMDISysAccel
Create MDI client windowcase WM_CREATE:
{
CLIENTCREATESTRUCT ccs;
ccs.hWindowMenu = GetSubMenu(GetMenu(hWnd), 1);
ccs.idFirstChild = 10000;
hMDIClient = CreateWindow( "MDICLIENT", "",
WS_CHILD | WS_CLIPCHILDREN |
WS_VSCROLL | WS_HSCROLL | WS_VISIBLE,
0, 0, 0, 0,
hWnd, (HMENU)1, hInst, &ccs);
}
...
default:
return DefFrameProc(hWnd, hMDIClient,
message, wParam, lParam);
Modify message loopwhile (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateMDISysAccel(hMDIClient, &msg) &&
!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
MDI menu• MDI child window names are automatically
added to window menu.
• Selecting menu item corresponding to MDI child window activates the window
• Handle to menu where MDI child window names should be added is passed to MDICLIENT window
• If there are more than 10 MDI child windows – “more windows” menu item is displayed
Standard MDI commands• Standard MDI commands like Cascade, Tile are
handled by sending messages to MDI child window
case ID_WINDOW_TILE_HORZ:
SendMessage( hMDIClient, WM_MDITILE,
MDITILE_HORIZONTAL, 0 );
break;
case ID_WINDOW_CASCADE:
SendMessage( hMDIClient, WM_MDICASCADE, 0, 0 );
break;
case ID_WINDOW_ARRANGE:
SendMessage( hMDIClient, WM_MDIICONARRANGE, 0, 0 );
break;