I want to implement a control to change the relative size of two sections within a single entity. This would use an east-west resize cursor, and as the user dragged it would make one block smaller and the other larger. The parent entity needs to remain the same size.
I have had a look at JQueryUI Resizables, Draggables and Sliders. None of them are quite a perfect fit.
Do you know what this pattern is called? Can you think of an implementation of this pattern in the wild (preferably web based)?