Dear list, As there has not been a response to my query about Unicode deletion-key interrupts, one of the following must be true:
- My question does not make sense, as I have made an incorrect assumption - No-one on the list has written code for a text editor widget - No-one wishes to share their experience writing code for a text editor widget The first reason is most likely, but I would appreciate a brief explanation. Deletion-key interrupts are a fundamental use-case of creating an application with interactive text, so I think this is an important talking point. Jeff. On 22 July 2017 at 12:45, Jeffrey Sheen < jeffrey.shee...@alumni.imperial.ac.uk> wrote: > Dear list, > > I would like to leverage your experience with the Pango API. > > I am currently using "pango_layout_move_cursor_visually" to handle > arrow-key presses. This establishes the byte index that the cursor should > be moved to, visually skipping whole grapheme clusters. > > However, I understand that there are more states are required when > handling the delete and backspace keys, depending on the text's language. > > i.e. it is possible to press a deletion key, and the grapheme cluster be > altered, but not reduce the number of grapheme clusters in the string. > > Reading the Pango API documentation, this aspect appears to be represented > with the "PangoLogAttr.backspace_deletes_character" member variable. > > However, unlike "pango_layout_move_cursor_visually", > "pango_get_log_attrs" operates below the level of a PangoLayout object, > requiring a PangoLanguage* to be passed. > > Must I manually store the language that a block of text is written in and > convert this to a PangoLanguage object? > > What is the best practice when handling a delete/backspace key press? > > Cheers, > > Jeff. >
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