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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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ScrollWindow
The ScrollWindow function scrolls the content of the specified window's client area. This
function exists for backward compatibility. For new applications, use the ScrollWindowEx function.
BOOL ScrollWindow(
HWND hWnd,
| // handle of window to scroll
| int XAmount,
| // amount of horizontal scrolling
| int YAmount,
| // amount of vertical scrolling
| CONST RECT *lpRect,
| // address of structure with scroll rectangle
| CONST RECT *lpClipRect
| // address of structure with clip rectangle
| );
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Parameters
hWnd
Identifies the window where the client area is to be scrolled.
XAmount
Specifies the amount, in device units, of horizontal scrolling. If the window
being scrolled has the CS_OWNDC or CS_CLASSDC style, then this parameter uses
logical units rather than device units. This parameter must be a negative value
to scroll the content of the window to the left.
YAmount
Specifies the amount, in device units, of vertical scrolling. If the window
being scrolled has the CS_OWNDC or CS_CLASSDC style, then this parameter uses
logical units rather than device units. This parameter must be a negative value to
scroll the content of the window up.
lpRect
Points to the RECT structure specifying the portion of the client area to be scrolled. If this
parameter is NULL, the entire client area is scrolled.
lpClipRect
Points to the RECT structure containing the coordinates of the clipping rectangle. Only device
bits within the clipping rectangle are affected. Bits scrolled from the outside
of the rectangle to the inside are painted; bits scrolled from the inside of
the rectangle to the outside are not painted.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error
information, call GetLastError.
Remarks
If the caret is in the window being scrolled, ScrollWindow automatically hides the caret to prevent it from being erased and then
restores the caret after the scrolling is finished. The caret position is adjusted
accordingly.
The area uncovered by ScrollWindow is not repainted, but it is combined into the window's update region. The
application eventually receives a WM_PAINT message notifying it that the region
must be repainted. To repaint the uncovered area at the same time the scrolling
is in action, call the UpdateWindow function immediately after calling ScrollWindow.
If the lpRect parameter is NULL, the positions of any child windows in the window are
offset by the amount specified by the XAmount and YAmount parameters; invalid (unpainted) areas in the window are also offset. ScrollWindow is faster when lpRect is NULL.
If lpRect is not NULL, the positions of child windows are not changed and invalid areas
in the window are not offset. To prevent updating problems when lpRect is not NULL, call UpdateWindow to repaint the window before calling ScrollWindow.
See Also
RECT, ScrollDC, ScrollWindowEx, UpdateWindow
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