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CalculatePopupWindowPosition function (winuser.h)

Calculates an appropriate pop-up window position using the specified anchor point, pop-up window size, flags, and the optional exclude rectangle. When the specified pop-up window size is smaller than the desktop window size, use the CalculatePopupWindowPosition function to ensure that the pop-up window is fully visible on the desktop window, regardless of the specified anchor point.

Syntax

BOOL CalculatePopupWindowPosition(
 [in] const POINT *anchorPoint,
 [in] const SIZE *windowSize,
 [in] UINT flags,
 [in, optional] RECT *excludeRect,
 [out] RECT *popupWindowPosition
);

Parameters

[in] anchorPoint

Type: const POINT*

The specified anchor point.

[in] windowSize

Type: const SIZE*

The specified window size.

[in] flags

Type: UINT

Use one of the following flags to specify how the function positions the pop-up window horizontally and vertically. The flags are the same as the vertical and horizontal positioning flags of the TrackPopupMenuEx function.

Use one of the following flags to specify how the function positions the pop-up window horizontally.

Value Meaning
TPM_CENTERALIGN
0x0004L
 Centers pop-up window horizontally relative to the coordinate specified by the anchorPoint->x parameter.
TPM_LEFTALIGN
0x0000L
 Positions the pop-up window so that its left edge is aligned with the coordinate specified by the anchorPoint->x parameter.
TPM_RIGHTALIGN
0x0008L
 Positions the pop-up window so that its right edge is aligned with the coordinate specified by the anchorPoint->x parameter.
 

Uses one of the following flags to specify how the function positions the pop-up window vertically.

Value Meaning
TPM_BOTTOMALIGN
0x0020L
 Positions the pop-up window so that its bottom edge is aligned with the coordinate specified by the anchorPoint->y parameter.
TPM_TOPALIGN
0x0000L
 Positions the pop-up window so that its top edge is aligned with the coordinate specified by the anchorPoint->y parameter.
TPM_VCENTERALIGN
0x0010L
 Centers the pop-up window vertically relative to the coordinate specified by the anchorPoint->y parameter.
 

Use one of the following flags to specify whether to accommodate horizontal or vertical alignment.

Value Meaning
TPM_HORIZONTAL
0x0000L
 If the pop-up window cannot be shown at the specified location without overlapping the excluded rectangle, the system tries to accommodate the requested horizontal alignment before the requested vertical alignment.
TPM_VERTICAL
0x0040L
 If the pop-up window cannot be shown at the specified location without overlapping the excluded rectangle, the system tries to accommodate the requested vertical alignment before the requested horizontal alignment.
 

The following flag is available starting with Windows 7.

Value Meaning
TPM_WORKAREA
0x10000L
 Restricts the pop-up window to within the work area. If this flag is not set, the pop-up window is restricted to the work area only if the input point is within the work area. For more information, see the rcWork and rcMonitor members of the MONITORINFO structure.

[in, optional] excludeRect

Type: RECT*

A pointer to a structure that specifies the exclude rectangle. It can be NULL.

[out] popupWindowPosition

Type: RECT*

A pointer to a structure that specifies the pop-up window position.

Return value

Type: BOOL

If the function succeeds, it returns TRUE; otherwise, it returns FALSE. To get extended error information, call GetLastError.

Remarks

TPM_WORKAREA is supported for the TrackPopupMenu and TrackPopupMenuEx functions.

Requirements

Requirement Value
Minimum supported client Windows 7 [desktop apps only]
Minimum supported server Windows Server 2008 R2 [desktop apps only]
Target Platform Windows
Header winuser.h (include Windows.h)
Library User32.lib
DLL User32.dll

See also

Reference

TrackPopupMenu

TrackPopupMenuEx

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