Changing tab stops

Thursday Aug 6th 1998 by Zafir Anjum

Changing tab stops

The rich edit control has tab stops set every half inch by default. The tab stop is a paragraph attribute and you can change it by changing the paragraph format. The tab stop setting applies to the current selection, and if nothing is selected, the format will apply to the new text inserted at that point. The following code sets the tab stop to every inch.

We set the cTabCount to MAX_TAB_STOPS which is defined by Windows. When you specify the value for the tab stops, you specify absolute values. For instance, the first stop at = inch, the second at 1 inch, the third at 1= inch and so forth. Also, the values are specified in twips. A twip is 1/20 of a point and a point is 1/72 of an inch. That is, an inch is 1440 twips.

Although, we specify all the tab stops, you may choose to change only one or just thefirst few of the tab stops. The remainder of the tab stops would then be at the = inch interval.

	pf.cbSize = sizeof(PARAFORMAT);
	pf.dwMask = PFM_TABSTOPS ;
	pf.cTabCount = MAX_TAB_STOPS;
	// Set tab stops every inch (=1440 twip)
	for( int itab = 0 ; itab < pf.cTabCount  ; itab++ )
		pf.rgxTabs[itab] = (itab+1) * 1440 ;	
	SetParaFormat( pf );

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