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Automatic arrangement of nodes in VisualScript/VisualShaders editors

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This PR and commit adds the functionality to arrange nodes in VisualScript/VisualShader editor. The layout generated by this 
feature is compact, with minimum crossings between connections
& uniform horizontal & vertical gaps between the nodes. 

This work has been sponsored by GSoC '21.

Full list of additions/changes:
• Added arrange_nodes() method in GraphEdit module.
    • This method computes new positions for all the selected
      nodes by forming blocks and compressing them.
      The nodes are moved to these new positions. 
    • Adding this method to GraphEdit makes it available for 
      use in VisualScript/VisualShaders editors and its other
      subclasses. 
• Button with an icon has been added to call arrange_nodes() in GraphEdit. 
    • This button is inherited by VisualScript/VisualShaders editors
       to invoke the method.
• Undo/redo is functional with this method.
    • By using signals in arrange_nodes(), position changes are registered 
       in undo/redo stack of the subclass that is using the method. 
• Metadata of the method has been updated in ClassDB
• Method description has been added to class reference of GraphEdit
This commit is contained in:
Umang Kalra 2021-08-11 00:44:19 +05:30
parent da339f8ffc
commit 12fc3f1eef
9 changed files with 542 additions and 1 deletions
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2
modules/visual_script/visual_script_editor.h
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@ -60,7 +60,7 @@ class VisualScriptEditor : public ScriptEditorBase {
EDIT_CUT_NODES,
EDIT_PASTE_NODES,
EDIT_CREATE_FUNCTION,
REFRESH_GRAPH
REFRESH_GRAPH,
};
enum PortAction {