cocoa - How to force redrawing a group row in a NSOutlineView after it’s been expanded/collapsed -

i tried calling setneedsdysplay: , setneedsdisplayinrect: drawbackgroundinrect: , drawseparatorinrect: not called group row else

this piece of code have:

- (void)outlineview:(nsoutlineview *)outlineview didaddrowview:(nstablerowview *)rowview forrow:(nsinteger)row {     id previtem = [outlineview itematrow:row - 1];     if ([self outlineview:outlineview isgroupitem:previtem]) {         id view = [self outlineview:outlineview rowviewforitem:previtem];         if (view) {             [view setneedsdisplay:yes];         }     } } 

edit

this came with:

- (void)outlineview:(nsoutlineview *)outlineview didremoverowview:(nstablerowview *)rowview forrow:(nsinteger)row {     // todo: find a better way repaint node after it's been collapsed     (nsview *view in outlineview.subviews) {         nsinteger testrow = [outlineview rowforview:view];         if (testrow == row - 1) {             id item = [outlineview itematrow:testrow];             if ([(id)outlineview outlineview:outlineview isgroupitem:item]) {                 [view setneedsdisplay:yes];             }         }     } }  - (void)outlineview:(nsoutlineview *)outlineview didaddrowview:(nstablerowview *)rowview forrow:(nsinteger)row {     // todo: find a better way repaint node after it's been expanded     (nsview *view in outlineview.subviews) {         nsinteger testrow = [outlineview rowforview:view];         if (testrow == row - 1) {             id item = [outlineview itematrow:testrow];             if ([(id)outlineview outlineview:outlineview isgroupitem:item]) {                 [view setneedsdisplay:yes];             }         }     } } 

...but it's slow in cases

ok, did trick:

- (void)outlineviewitemdidcollapse:(nsnotification *)notification {     nsinteger row = [_outlineview rowforitem:notification.userinfo[@"nsobject"]];     nsview *rowview = [_outlineview rowviewatrow:row makeifnecessary:no];     [rowview setneedsdisplay:yes]; }  - (void)outlineviewitemdidexpand:(nsnotification *)notification {     nsinteger row = [_outlineview rowforitem:notification.userinfo[@"nsobject"]];     nsview *rowview = [_outlineview rowviewatrow:row makeifnecessary:no];     [rowview setneedsdisplay:yes]; }