Hi, I'm attempting to implement a feature in a plain text editor that similar to Notepad++'s "show hidden characters", which allows toggle the visibility of non-printable characters, like zero-width space, CR LF and so-on, which look like this in Notepad++ (see the attachment for the sample document):
[image: image.png] By looking at QTextLine and QTextLayout, it doesn't seems like there is a way to specific a certain unicode glyph's width (to reserve the space so we can then draw the character as visible glyphs manually). What comes to mind are the following two approaches: 1. Subclass QTextLayout to override the behavior of `cursorToX()` and other related functions. By quickly take a look at this approach, it might be more complex than I thought, which will require using Qt's private header to access QTextEngine-related stuff. 2. Create a custom font that provides these characters, and ensure that font will be used before any other fonts. I'm not exactly sure if this method is possible though. So the question is, what's the proper approach to implement such a feature using Qt's public API? Do the mentioned two approaches sound right? Thanks! Gary
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