Drag resizable columns in a headerless NSTableView

Currently table headers are responsible for handling the dynamic resizing of table columns. I have needed to make it possible to resize table columns from within the table - so the idea is that you will be able to:

• move your mouse to the divider between two columns
• the cursor will change to indicate that you can resize the column
• click and drag and your column will resize.

I already have a NSTableView sublclass that has modest, general, enrichments for the very few enhancements I need to NSTableView - so my aim is to enhance this a little.

As a start point I looked at the CocoaTron code for the NSTableHeader. My thought was the CocoaTron NSTableHeader will be much like the cocoa table header, it handles resizing so will in the least be a reasonable template for implementing my own table. As it happens I was able to more-or-less copy/paste the code for the following key methods into my NSTableView.

-(void)resetCursorRects;

-(void)resizeWithOldSuperviewSize:(NSSize)size;

-(void)mouseDown:(NSEvent *)theEvent;

Of course there is a little more to it than this - but it is small beer and this small piece of CocoaTron proved an excellent starting - and indeed took me most of the way.