Creating a "split view" with two dynamic panels with a draggable middle adjuster that resizes each - what's the best approach?

[mbc66]

There was a similar thread last year:

Resize dynamic panel with drag

You’re close. First of all, you would not be able to see the dynamic panel, “Box” resize, other than to see that its contents (the one gray rectangle) would appear to move with the Slider as you dragged it (because by default dynamic panels have a transparent fill.) But, you can directly resize the gray rectangle inside it and since the dynamic panel is set to “Fit to Content” then it’s size will change with the rectangle’s size. Secondly, you don’t have a local variable defined for LVAR1 in y…

I updated that for RP9 with direct resizing of both panels, and added a variation (intended to be more reliable) and another variation for a “drag to reveal” effect. The first two will resize the content in the dynamic panel (one rectangle widget in each panel) with the dynamic panels set to “Fit to Content” so they will automatically be resized. The third approach only resizes the dynamic panel dimensions, thus revealing more or less content as the slider is dragged–and actually only one panel is resized as it sits in front of the second panel, but the visual effect is that both are resized.

split frame with slider.rp (612.5 KB)