picklesrus 7f02c19bfe Improve performance of block dragging. This is a backport of the blo… (#732)
Improve performance of block dragging.  This is a backport of the block drag surface from scratch-blocks.  At the beginning of a block drag, blocks get moved to a drag surface which then translates using translate3d to avoid repainting the entire svg on every mouse move.  At the end of the drag, the blocks are dropped back in the svg in their new position.
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Blockly

Google's Blockly is a web-based, visual programming editor. Users can drag blocks together to build programs. All code is free and open source.

The project page is https://developers.google.com/blockly/

Description
The web-based visual programming editor.
Readme Apache-2.0 250 MiB
Languages
TypeScript 51.3%
JavaScript 40.6%
Python 2.1%
HTML 1.8%
PHP 1.5%
Other 2.7%