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[REBOL] Re: Question: [ searching for answer on GUI speed ]

From: greggirwin:mindspring at: 11-Mar-2002 22:38

Hi Sunanda, << I tried to speed up an application I had written, and the one sticking point was Layout. The application creates a tree view from a hierarchical structure. Nothing fancy, each line is simply made up of: -- A Pad to indent. -- For nodes, a Box with a +/- and a left-click action facet. -- A Text line with a left-click action facet. -- If the branch is closed, a text That says how many elements are "hidden" ... I could, of course, render only the bits that are visible, and write some interesting code to add faces as the user scrolls them into visibility, or opens and closes branches. >> I think rendering only the visible parts is the only way to get things to scale up, GUI-wise. In your example, you're creating somewhere around 600 faces (if I understand that each of the 200 lines creates a Box, and 2 Text items). I have a few ideas sketched out for how I might tackle a grid or tree-view, but haven't made any stabs at implementations yet. The design path I'm heading down is centered around DRAW commands rather than individual faces. I have no idea, yet, what issues I'll run into though. --Gregg