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EM_SETMARGINS Overview  Group

An application sends the EM_SETMARGINS message to set the widths of the left and right margins for an edit control. The message redraws the control to reflect the new margins.

EM_SETMARGINS 

wParam = (WPARAM) fwMargin;                    // left and/or right margins 

lParam = (LPARAM) MAKELONG(wLeft, wRight);     // width of left or right margins, in pixels 

 

Parameters

fwMargin
Value of wParam. Specifies the margins to set. This parameter can be a combination of the following values:

Value

Meaning

EC_LEFTMARGIN

Sets the left margin.

EC_RIGHTMARGIN

Sets the right margin.

EC_USEFONTINFO

Uses information about the current font of the edit control to set the margins. For a single-line edit control, margins are set to the average width of characters in the font. For a multiline edit control, the right margin is set to the “A” width of the font (the distance added to the current position before drawing a character), and the left margin is set to the “C” width (the distance added to the current position to provide white space to the right of a character).

If EC_USEFONTINFO is specified, the lParam parameter is ignored.

wLeft
Value of the low-order word of lParam. Specifies the width of the left margin, in pixels. This value is ignored if fwMargin does not include EC_LEFTMARGIN or if EC_USEFONTINFO is specified.
wRight
Value of the high-order word of lParam. Specifies the width of the right margin, in pixels. This value is ignored if fwMargin does not include EC_RIGHTMARGIN or if EC_USEFONTINFO is specified.

Return Values

This message does not return a value.

See Also

EM_GETMARGINS 


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