Jon: Thanks for taking the time to answer this so extensively. Your Method 2 is what I've come up with so far, only using descent instead of ascent, as you pointed out. And yeah, you're right - it doesn't always work since Flash does not seem to return accurate values for ascent/descent/etc. for all fonts. So I'm feeling kind of stuck at the end of this road ... maybe a Gumbo-truck will come to rescue soon?? ;-)
Alex Harui: > Subclass and reposition the internal textfield. The repositioning itself is not the problem, finding the number of pixels to reposition by is :) Bjørn 2008/12/17 Gordon Smith <[email protected]> > > This has been a long standing bug that I've been complaining to Adobe > about. > > > > The new Text Layout Framework that Gumbo components use gives you control > over the vertical placement of the first line. > > > > Gordon Smith > > Adobe Flex SDK Team > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *Jon Bradley > *Sent:* Tuesday, December 16, 2008 7:46 AM > *To:* [email protected] > *Subject:* Re: [flexcoders] Re: Padding/spacing before the first line in a > TextArea > > > > You can't manually remove that padding from the field. It's built into the > field as the ascent of the font + 4 pixels for the natural field border > (which also cannot be 'removed'). > > > > There are only two ways to shift up a field in Flash: > > > > Method 1: > > a. Bitmap snapshot of the text field > > b. getColorRectBounds on the bitmap in question to retrieve a bounding > rectangle of the non-alpha pixels. > > c. Capture the top position from the Rectangle returned from that call and > subtract that value from the y-position of the field. > > > > Pros: > > Will work every time > > > > Cons: > > Additional memory overhead. Tricky to do with the Flex component > architecture - especially TextArea > > > > Method 2: > > a. Capture font metrics from the text field > > b. Subtract (metrics.ascent + 4) from the text field y position. It is the > ascent measurement, not descent. > > > > Pros: > > Less memory and less code to deal with. > > > > Cons: > > Will not work every time. Ascent and descent measurements from the font > metrics within Flash are not accurate measurements and are only correct at > very, very specific font sizes (8, 12, 17, 28, 36, 44 ... etc.). > > > > Almost all point sizes of text return incorrect ascent and descent values > in Flash. They usually return values less than they really are (7,8,9 point > type will return the same ascent value for most fonts, for example). > > > > Additionally, you'll still need to extend TextArea to handle the > functionality. > > > > Does not function well at all with advanced antialiasing ... also a known > bug in the Flash text rendering. Saffron antialiasing causes a jump in the > leading and position values of lines in a field, so don't use it. > > > > ------ > > > > This has been a long standing bug that I've been complaining to Adobe > about. I've worked on applications for some big greeting card companies > (take a couple guesses) creating a rendering system in Flash that will match > Photoshop and Illustrator text rendering. Illustrator, btw, is the only > Adobe application that let's you set the first baseline position of a text > field using a variety of measures. > > > > Good luck. > > > > - jon > > > > > > On Dec 16, 2008, at 8:53 AM, bjorn wrote: > > > > Any ideas on where I might find more info about this? .. or people who > might know more ... > > > > > > 2008/12/2 bjorn <[email protected]> > > There is some padding before the first line in a TextArea. Have a look at > this image to see what I mean: > > > > http://i34.tinypic.com/4uz8s0.jpg > > > > I need to remove this, and the first solution that comes to mind is to find > that value and position the TextArea.y = TextArea.y - [that value]. The > padding before the first line seems to be equal (in most cases) to the > font's descent, which I can get from getTextLineMetrics().descent. > > > > However, this is not true in all cases. In some cases, the padding is more. > > > > Anyone have suggestions? > > > > > > > -- ======================== http://www.juicability.com - flex blog http://www.nospoiler.com - link to youtube videos without the spoilers
