On 05/05/13 18:42, Daniel J Sebald wrote:
On 05/05/2013 12:14 PM, Baz Walter wrote:
It looks like Scintilla may provide some low-level stuff that could be
enough to roll your own solution.
I suggest you take a look at the SCN_MODIFIED notification:
http://www.scintilla.org/ScintillaDoc.html#SCN_MODIFIED
which sets the SC_MOD_CHANGEMARKER flag when the markers have changed,
and also gives the line on which the changes occurred.
OK, thanks. I'll have to experiment a bit. That might be the answer;
at least I'm pretty sure there needs to be some type of notification
that a marker line has changed. It doesn't seem enough to be notified
about a block of text either deleted or added (i.e., "linesAdded" being
0, + or -). If one gets that notification and then inquires the
position of markers (easy to do right now) that doesn't indicate whether
the marker was moved or not. Can a person deduce that information?
Probably not, unless maybe one continually keeps track of where markers
are moving to whenever there is any kind of line change. Might work,
e.g., "last_known_editor_linenr".
I see in this description that "text" is "If we are collecting undo
information this holds a pointer to the text that is handed to the Undo
system, otherwise it is zero." I know little about Scintilla, but that
suggests to me that there is no way of retaining marker line location in
that Undo system...unless it can be encoded in the text somehow. The
information about the markers. Does it pay to write a bug report for
such a thing?
I'm not sure whether there are any actual bugs here, or just some
possible missing features.
According to this section of the docs (last paragraph):
http://www.scintilla.org/ScintillaDoc.html#Markers
the behaviour of moving the markers of deleted lines is deliberate. It
looks like it might be possible to use the SC_MOD_BEFOREDELETE
notification to scan for markers in affected lines, and then use the
SC_MOD_CHANGEMARKER notification to remove them from the line that
receives them. It would be good if there was a method for switching the
behaviour off altogether, though.
As for restoring markers with undo/redo, there was a thread about this
on the scintilla mailing list:
https://groups.google.com/d/msg/scintilla-interest/48WKhPHsH6M/5EClWdRNVQ8J
The gist of it seems to be that the current behaviour is also
deliberate, but it may be possible to work around it using the existing
apis. Getting the feature added to Scintilla looks unlikely, though.
BTW: I you do want to make feature requests for Scintilla, you should
try here:
http://sourceforge.net/p/scintilla/feature-requests/
--
Regards
Baz Walter
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