Child Window Size and Arrangement
An MDI application controls the size and position of its child windows by
sending messages to the MDI client window. To maximize the active child window, the
application sends the
WM_MDIMAXIMIZE message to the client window. When a child window is maximized, its client
area completely fills the MDI client window. In addition, Windows automatically
hides the child window's title bar, and adds the child window's
window menu icon and Restore button to the MDI application's menu bar. The
application can restore the client window to its original (premaximized) size and
position by sending the client window a
WM_MDIRESTORE message.
An MDI application can arrange its child windows in either a cascade or tile
format. When the child windows are cascaded, the windows appear in a stack. The
window on the bottom of the stack occupies the upper left corner of the screen,
and the remaining windows are offset vertically and horizontally so that the
left border and title bar of each child window is visible. To arrange child
windows in the cascade format, an MDI application sends the
WM_MDICASCADE message. Typically, the application sends this message when the user chooses
the Cascade command from the Window menu.
When the child windows are tiled, Windows displays each child window in its
entirety
![pics/WIN3200090001.gif](pics/WIN3200090001.gif)
overlapping none of the windows. All of the windows are sized, as necessary,
to fit within the client window. To arrange child windows in the tile format,
an MDI application sends a
WM_MDITILE message to the client window. Typically, the application sends this message
when the user chooses the Tile command from the Window menu.
An MDI application should provide a different icon for each type of child
window it supports. The application specifies an icon when registering the child
window class. Windows automatically displays a child window's icon in the lower
portion of the client window when the child window is minimized. An MDI
application directs Windows to arrange child window icons by sending a
WM_MDIICONARRANGE message to the client window. Typically, the application sends this message
when the user chooses the Arrange Icons command from the Window menu.
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