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Calculates the approximate width and height required to display a given number of items. You can send this message explicitly or use the ListView_ApproximateViewRect macro.
Parameters
-
wParam
-
The number of items to be displayed in the control. If this parameter is set to -1, the message uses the total number of items in the control.
-
lParam
-
The LOWORD is the proposed x-dimension of the control, in pixels. This parameter can be set to -1 to allow the message to use the current width value.
The HIWORD is the proposed y-dimension of the control, in pixels. This parameter can be set to -1 to allow the message to use the current height value.
Return value
Returns a DWORD value that holds the approximate width (in the LOWORD) and height (in the HIWORD) needed to display the items, in pixels.
Remarks
Setting the size of the list-view control based on the dimensions provided by this message can optimize redraw and reduce flicker.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista [desktop apps only] |
| Minimum supported server |
Windows Server 2003 [desktop apps only] |
| Header |
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