MeasureItem for dynamic font changing in a list control

Zafir's article on adjusting row height in a CListCtrl derived class needs to be adjusted when dealing with dynamic font changes. His sample causes some problems where the row height is not correctly computed to compensate for different video display modes.

The code snip below responds correctly to font changes by selecting the font object into the Client Dc, then obtains the text metrics. Note that we are adding tmHeight and tmExternalLeading values to cover the glyphs that extend beyond the normal height boundaries of a given font.

void CMyListCtrl::MeasureItem( LPMEASUREITEMSTRUCT lpMeasureItemStruct )
{
	CClientDC dc( this );
	CFont* pFont = GetFont();
	ASSERT( pFont );

	CFont* pOldFont = dc.SelectObject( pFont );
	ASSERT( pOldFont );

	TEXTMETRIC txtMetric;
	BOOL bRet = dc.GetTextMetrics( &txtMetric );
	ASSERT( bRet );

	int cyChar = txtMetric.tmHeight + txtMetric.tmExternalLeading;
	ASSERT( 0 != cyChar );

	lpMeasureItemStruct->itemHeight = cyChar;
}

Last updated: 29 July 1998 by Rob Osborne



Comments

  • You must say something about reflected messages.

    Posted by Legacy on 11/05/1998 12:00am

    Originally posted by: Mihai

    Sincerely, Mihai Filimon
    

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Learn How A Global Entertainment Company Saw a 448% ROI Every business today uses software to manage systems, deliver products, and empower employees to do their jobs. But software inevitably breaks, and when it does, businesses lose money -- in the form of dissatisfied customers, missed SLAs or lost productivity. PagerDuty, an operations performance platform, solves this problem by helping operations engineers and developers more effectively manage and resolve incidents across a company's global operations. …

  • Live Event Date: December 18, 2014 @ 2:00 p.m. ET / 11:00 a.m. PT The Internet of Things (IoT) incorporates physical devices into business processes using predictive analytics. While it relies heavily on existing Internet technologies, it differs by including physical devices, specialized protocols, physical analytics, and a unique partner network. To capture the real business value of IoT, the industry must move beyond customized projects to general patterns and platforms. Check out this upcoming webcast …

Most Popular Programming Stories

More for Developers

RSS Feeds