objective c - NSOutlineView Changing disclosure Image -


i outline view, adding custom cell, drawing custom cell, referring example code , present in cocoa documentation

http://www.martinkahr.com/2007/05/04/nscell-image-and-text-sample/

i want change disclosure image of cell custom image, have tried following things 

- (void)outlineview:(nsoutlineview *)outlineview willdisplaycell:(id)cell fortablecolumn:(nstablecolumn *)tablecolumn item:(id)item      {         if([item iskindofclass:[nsvalue class]])         {             mydata *pdt = (mydata *)[item pointervalue];             if(pdt->isgroupelement())             {                 [cell setimage:pgroupimage];             }         } }

but not working, there other way change disclosure image, how can find out in willdisplaycell whether item expand or collapse, can set image accordingly,

is place change disclosure image ?

you've got basic idea need draw image yourself. here's code use:

- (void)outlineview:(nsoutlineview *)outlineview willdisplayoutlinecell:(id)cell fortablecolumn:(nstablecolumn *)tablecolumn item:(id)item {     nsstring *theimagename;     nsinteger thecellvalue = [cell integervalue];     if (thecellvalue==1) {         theimagename = @"pmoutlinecellon";     } else if (thecellvalue==0) {         theimagename = @"pmoutlinecelloff";     } else {         theimagename = @"pmoutlinecellmixed";     }      nsimage *theimage = [nsimage imagenamed: theimagename];     nsrect theframe = [outlineview frameofoutlinecellatrow:[outlineview rowforitem: item]];     theframe.origin.y = theframe.origin.y +17;     // adjust theframe here position image     [theimage compositetopoint: theframe.origin operation:nscompositesourceover];     [cell setimageposition: nsnoimage]; }

you need 3 different images can see, 1 on state, 1 off state , 1 mixed state should halfway between two. mixed state makes sure still opening , closing animation.


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