这是一个 Windows API 函数,经 Delphi 封装了,在上面按 F1 就可找到其用法。
如果查不到,那是因为你安装 Delphi 时未选安装 Windows SDK 帮助文件。
这里是它的定义:
The ShowScrollBar function shows or hides the specified scroll bar.
BOOL ShowScrollBar(
HWND hWnd, // handle of window with scroll bar
int wBar, // scroll bar flag
BOOL bShow // scroll bar visibility flag
);
Parameters
hWnd
Identifies a scroll bar control or a window with a standard scroll bar, depending on the value of the wBar parameter.
wBar
Specifies the scroll bar(s) to be shown or hidden. This parameter can be one of the following values:
Value Meaning
SB_BOTH Shows or hides a window's standard horizontal and vertical scroll bars.
SB_CTL Shows or hides a scroll bar control. The hWnd parameter must be the handle of the scroll bar control.
SB_HORZ Shows or hides a window's standard horizontal scroll bars.
SB_VERT Shows or hides a window's standard vertical scroll bar.
bShow
Specifies whether the scroll bar is shown or hidden. If this parameter is TRUE, the scroll bar is shown; otherwise, it is hidden.
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
While processing a scroll bar message, an application should not call this function to hide a scroll bar.
See Also
GetScrollPos, GetScrollRange, ScrollDC, ScrollWindow, SetScrollPos, SetScrollRange
其Pascal 定义在 windows.pas 单元中 31100 行。