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Re: Pango delete/backspace best practices




Thank you Emmanuele,

I received similar feedback from another member of the list.

I will take a look at the suggested source code in GtkTextView and GtkEntry (I am unfamiliar, as I am not using the upper libraries in the GTK stack).

A suggestion of a more suitable mailing list would be appreciated as well. I do not want to clutter an inappropriate group.

On 1 September 2017 at 12:34, Emmanuele Bassi <ebassi@xxxxxxxxx> wrote:
Or, more likely, you sent the email to the wrong list. You probably
want to talk to the developers of text editors based on GtkTextView
and Pango.

Additionally, you may want to look at GtkTextView itself.

Ciao,
 Emmanuele.


On 1 September 2017 at 12:14, Jeffrey Sheen
<jeffrey.sheen00@alumni.imperial.ac.uk> wrote:
> 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.sheen00@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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>



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