On Friday 06 January 2006 18:56, Frank Meies wrote: > > Ok, next try. Let's have a look at your example: > > ga + cd + la <space> sa > > Start with the cursor in front of ga (position 0 in the unicode string). > Pressing -> should advance the cursor to position 3 in the unicode > string (because 1 and 2 aren't valid cursor positions). Have a look at > SwCntntNode::GoNext(), there is a call to the nextCharacters() function > of the breakiterator. Before the call nPos should be 0, after the call > nPos should be 3. Can you verify this? I will get on it, and get you some results :) > > One more question: There seem to be some 'hidden' characters in your > document. Set the cursor to the start of the last line of text, press -> > 5 times. Press backspace once. A character in the unicode string will be > deleted, but there is not visible effect. It is probably a ZWJ or ZWNJ which are pretty much essential in typing Malayalam/Indic texts.
The BreakIterator effectively handles these characters. But the problem is the deletion strategy for Unicode which is problematic, and we are having some discussions at unicode to resolve this: it is the backspace-key deletion which is different from the delete-key deletion. The backspace key deletes unicode character one by one and the delete key deletes it cluster by cluster. The Backspace key should also delete cluster by cluster, else there will be some problems during editing of text one of which you have discovered :) > > > Looking at the source code and the document that you had referenced, > > there is a kern array which stores the gaps between character (or > > character clusters ?). The cursor uses this for computing the widths for > > travelling ? Does the rendering engine also use this same kern array for > > the purpose ? > > yes. Hmm, thats wierd ... in that case, there must be some additional processing done after the value is retrieved from the kern array correct ? Regards, Rajeev J Sebastian --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
