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This is a squash and merge of a large set of changes by @BeksOmega * Added functionality to scrolling, dragging, and zooming. * Fixed incorrect changes to workspaceChanged function. * Fixed comment. * Fixed typo. * Removed scrollbar.set calls from workspace_svg. * Removed scrollbar.resize() call. * Added move options to playground. * Fixed scroll_ calls that replaced scrollbar.set calls. * Removed this.scrollbar checks. * Changed zoom so that it always zooms towards the coordinates. Changed isContentBounded_ to be separate from isMovable_ (b/c of the previous change zoomControls had to be added to the bounded check). Fixed scroll_() calls... again. * Changed procedures so the Highlight definition option is only available if the workspace is moveable. * Fixed scrollCenter so that it works with flyout toolboxes. * Fixed zoomToFit so that it works with horizontal flyout toolboxes. * Fixed Typo. * Fixed bumping blocks when the workspace is not movable. * Fixed bumping not working with left and top toolbox positions. * Re-Added not allowing scrollCenter if the workspace is not movable. Disabled scrollCenter button for this case. * Cleaned up formatting. * Fixed bumping... again. Reformatted workspaceChanged a bit. * Changed blocks to be completely bumped into the workspace. * Reorganized metrics-getting for workspaceChanged. * Added bumping workspace comments. Moved event checking. * Renamed workspaceChanged to bumpObjects. * Added a bumpObjects developer reminder. * Added warning to zoomToFit. * Cleaned up some text. * Added better inline documentation. * Fixed up inline docs. * Cleaned up comments. * Fixed zoomCenter not actually zooming towards the center. * Fixed zoomControls error on unmovable bottom-toolbox workspaces * Fixed programatically placing blocks in an unmovable workspace. * Removed unnecessary translate call in inject. * Reversed removal of translate. (apparently it was necessary) * Cleaned up code in response to first round of reviews. * Added unit comments to the zoom function. * Removed bumpObjectsEventChecker. Added BUMP_EVENTS list to Blockly.Events. * Changed getWorkspaceObjectMetrics call to getBoundingRectangle(). * Fixed utils.mouseToSvg (was causing problems with zoom on wheel if the page was scrolled). * Fixed zoom when page is scrolled (actually this time). Reverted changes to utils.mouseToSvg. * Fixed centerOnBlock. * Added unit docs to translate. Moved setting the grid position to the translate function. * Added TODO's.
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/
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