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List:       openjdk-openjfx-dev
Subject:    Re: RFR: JDK-8314215 Trailing Spaces before Line Breaks Affect the Center Alignment of Text
From:       Kevin Rushforth <kcr () openjdk ! org>
Date:       2023-09-30 17:38:49
Message-ID: eZYJ5CrvkJywiGbO504ll_rjCxtdutUvwcuiYmGKP5k=.ca501305-79de-42b3-9622-b177b1e52da7 () github ! com
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On Sun, 10 Sep 2023 20:50:18 GMT, John Hendrikx <jhendrikx@openjdk.org> wrote:

> There are a number of tickets open related to text rendering:
> 
> https://bugs.openjdk.org/browse/JDK-8314215
> 
> https://bugs.openjdk.org/browse/JDK-8145496
> 
> https://bugs.openjdk.org/browse/JDK-8129014
> 
> They have in common that wrapped text is taking the trailing spaces on each wrapped \
> line into account when calculating where to wrap.  This looks okay for text that is \
> left aligned (as the spaces will be trailing the lines and generally aren't a \
> problem, but looks weird with CENTER and RIGHT alignments.  Even with LEFT \
> alignment there are artifacts of this behavior, where a line like `AAA  BBB  CCC` \
> (note the **double** spaces) gets split up into `AAA  `, `BBB  ` and `CCC`, but if \
> space reduces further, it will wrap **too** early because the space is taken into \
> account (ie. `AAA` may still have fit just fine, but `AAA  ` doesn't, so the engine \
> wraps it to `AA` + `A  ` or something). 
> The fix for this is two fold; first the individual lines of text should not include \
> any trailing spaces into their widths; second, the code that is taking the trailing \
> space into account when wrapping should ignore all trailing spaces (currently it is \
> ignoring all but one trailing space).  With these two fixes, the layout in \
> LEFT/CENTER/RIGHT alignments all look great, and there is no more early wrapping \
> due to a space being taking into account while the actual text still would have fit \
> (this is annoying in tight layouts, where a line can be wrapped early even though \
> it looks like it would have fit). 
> If it were that simple, we'd be done, but there may be another issue here that \
> needs solving: wrapped aligned TextArea's. 
> TextArea don't directly support text alignment (via a setTextAlignment method like \
> Label) but you can change it via CSS. 
> For Left alignment + wrapping, TextArea will ignore any spaces typed before a line \
> that was wrapped.  In other words, you can type spaces as much as you want, and \
> they won't show up and the cursor won't move.  The spaces are all getting appended \
> to the previous line.  When you cursor through these spaces, the cursor can be \
> rendered out of the control's bounds.  To illustrate, if you have the text `AAA     \
> BBB CCC`, and the text gets wrapped to `AAA`, `BBB`, `CCC`, typing spaces before \
> `BBB` will not show up.  If you cursor back, the cursor may be outside the control \
> bounds because so many spaces are trailing `AAA`. 
> The above behavior has NOT changed, is pretty standard for wrapped text controls, \
> and IMHO does not need further attent...

@prrace Can you take a look?

-------------

PR Comment: https://git.openjdk.org/jfx/pull/1236#issuecomment-1741821322


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