How can I prevent an NSBrowser from both scrolling and changing the cell selection after reloading columns?

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I haven’t looked into it, but can’t you retrieve the scroll position/selections and place them in variables? That way, after you reload it, just reset the scroll position and selection to the appropriate values. – RyanBates

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wouldn’t that cause an extra re-draw? I recall when I was having difficulty getting the browser to NOT change selection after I reloaded columns, it turned out that I was working with the browser improperly. Instead of reloading, I should have been redrawing. I forget the exact method to use, but it turned out to be a fairly easy fix once I realized that I was re-loading much too often.

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Actually I did something like this in my code to restore the cell selections and scroll positions. Something like the following (I have not included the supporting functions like absoultePathOfRepositoryRoot, etc…):

• (IBAction) refreshBrowserContent:(id)sender { NSString* pathRoot = [self absoultePathOfRepositoryRoot]; NSArray* selectedPaths = [self absoultePathsOfBrowserSelectedFiles];

  // Save scroll positions of the columns int numberOfColumns = [theBrowser lastColumn]; NSMutableArray* columnScrollPositions = [[NSMutableArray alloc] init]; int i; for (i = 0; i <= numberOfColumns; i++) { NSMatrix* matrixForColumn = [fsBrowser matrixInColumn:i]; NSScrollView* enclosingSV = [matrixForColumn enclosingScrollView]; NSPoint currentScrollPosition = enclosingSV contentView] bounds].origin; [columnScrollPositions addObject:[[[NSValue valueWithPoint:currentScrollPosition]]; }

  // Save the horizontal scroll position NSScrollView* horizontalSV = [fsBrowser matrixInColumn:0] enclosingScrollView] enclosingScrollView]; [[NSPoint horizontalScrollPostion = horizontalSV contentView] bounds].origin;

  rootNodeInfo_ = …compute this…;

  [self reloadData:self];

  // restore the selection and the scroll positions of the columns and the horizontal scroll [self restoreBrowserSelection:selectedPaths withColumnScrollPoisitions:columnScrollPositions andHorizontalScrollPosition:horizontalScrollPostion]; }

Then the restore is something like:

• (void) restoreBrowserSelection:([[NSArray) selectedPaths withColumnScrollPoisitions:(NSArray)columnScrollPositions andHorizontalScrollPosition:(NSPoint)horizontalScrollPostion; { if ([selectedPaths count] <1) return;

  // Restore the selection by looping over one of the selected paths and selecting the appropriate row in each column using … [theBrowser selectRow… ]…

  // Then finally selecting all the last path components and getting the rowIndexes in the last column and selecting them with: … [theBrowser selectRowIndexes:rowIndexes inColumn:(col-1)] …

  // restore column scroll positions int i = 0; for (NSValue* position in columnScrollPositions) { NSPoint savedScrollPosition = [position pointValue]; NSMatrix* matrixForColumn = [theBrowser matrixInColumn:i]; NSScrollView* enclosingSV = [matrixForColumn enclosingScrollView]; enclosingSV documentView] scrollPoint:savedScrollPosition]; i++; }

  // restore horizontal scroll position [[NSScrollView* horizontalSV = [[[theBrowser matrixInColumn:0] enclosingScrollView] enclosingScrollView]; [[horizontalSV documentView] scrollPoint:horizontalScrollPostion]; }