Le jeu 11/11/2004 à 13:31, Juha Nieminen a écrit : > In an application I'm making I would like to have a GtkTextView with > most of its text as non-editable (most of the text is generated > automatically by other means than the user writing it). > However, there are certain places here and there where the text should > be editable by the user. > > The GtkTextTag seems perfect for this purpose: I can set the GtkTextView > as non-editable and add proper GtkTextTags with the "editable" property > set in the places I want the user to be able to edit. > > However, there's one big problem with this: The start tag has right > gravity and the end tag has left gravity. > This means that if the user edits the beginning or the end of the > editable part, his text will end up as non-editable (because if he writes > a character eg. at the beginning of the editable part, the start tag will > end up at the right of this character and the written character will thus > end up outside the tags and thus become non-editable). > It also means that if the user completely deletes the text in the > editable part, he will be completely unable to add any text there anymore > (due to the gravity of the tags, if there's no text between them, it's > impossible to add any text there). > > I can't find any way of defining the gravity of GtkTextTags (as you can > do with GtkTextMarks). > Any ideas? > Perhaps what I want to achieve could be better done in a completely > different way? > The text is very dynamic so having fixed-sized field widgets is not > an option. Also it should be possible for the user to write text which > extends to several lines (ie. he should be able to type newlines as well) > in the editable parts. The editable parts are not independent lines in > the text but parts of existing non-editable lines. > > Doing the opposite, that is, marking all non-editable text with > non-editable tags and leaving the editable parts untagged is not a > viable solution. Due to how I generate the text it's very difficult > to join uneditable parts so that they all end up inside the same pair > of tags (if I wouldn't join them, the user would be able to add text > between the tags in places I don't want to allow it). Also, doing it > this way would allow the user to add text at the very beginning and end > of the text buffer, which is not what I want. > > Btw, a second question: How do you set the default text properties > (eg. font) of a GtkTextView? > (I would want the non-editable parts to have a certain style, but I can't > seem to find any way of setting this.) AFAIK, you should use the GtkTextBuffer events to update the tags after a user action. I had an analog problem in GChemPaint (I use a GnomeCanvasRichText instead of a GtkTextView but it should not be very different). Relevant code is in lib/text-object.cc and lib/text.cc. I don't use all the available events, just those I needed. There might be a better solution, but I could not find it. GChemPaint project page is at http://savannah.nongnu.org/projects/gchempaint Regards, Jean _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
