Enables you to produce special effects when showing or hiding windows. There are four types of animation: roll, slide, collapse or expand, and alpha-blended fade.
- hwnd [in]
A handle to the window to animate. The calling thread must own this window.
- dwTime [in]
The time it takes to play the animation, in milliseconds. Typically, an animation takes 200 milliseconds to play.
- dwFlags [in]
The type of animation. This parameter can be one or more of the following values. Note that, by default, these flags take effect when showing a window. To take effect when hiding a window, use AW_HIDE and a logical OR operator with the appropriate flags.
Type: Type: BOOL
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. The function will fail in the following situations:
- If the window is already visible and you are trying to show the window.
- If the window is already hidden and you are trying to hide the window.
- If there is no direction specified for the slide or roll animation.
- When trying to animate a child window with AW_BLEND.
- If the thread does not own the window. Note that, in this case, AnimateWindow fails but GetLastError returns ERROR_SUCCESS.
To get extended error information, call the GetLastError function.
To show or hide a window without special effects, use ShowWindow.
When using slide or roll animation, you must specify the direction. It can be either AW_HOR_POSITIVE, AW_HOR_NEGATIVE, AW_VER_POSITIVE, or AW_VER_NEGATIVE.
You can combine AW_HOR_POSITIVE or AW_HOR_NEGATIVE with AW_VER_POSITIVE or AW_VER_NEGATIVE to animate a window diagonally.
The window procedures for the window and its child windows should handle any WM_PRINT or WM_PRINTCLIENT messages. Dialog boxes, controls, and common controls already handle WM_PRINTCLIENT. The default window procedure already handles WM_PRINT.
If a child window is displayed partially clipped, when it is animated it will have holes where it is clipped.
AnimateWindow supports RTL windows.
Avoid animating a window that has a drop shadow because it produces visually distracting, jerky animations.
Minimum supported client
|Windows 2000 Professional [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|
Build date: 2/25/2013