Plugin for adding custom property editors on inspector. These plugins allow adding custom property editors to [EditorInspector]. Plugins are registered via [method EditorPlugin.add_inspector_plugin]. When an object is edited, the [method _can_handle] function is called and must return [code]true[/code] if the object type is supported. If supported, the function [method _parse_begin] will be called, allowing to place custom controls at the beginning of the class. Subsequently, the [method _parse_category] and [method _parse_property] are called for every category and property. They offer the ability to add custom controls to the inspector too. Finally, [method _parse_end] will be called. On each of these calls, the "add" functions can be called. Returns [code]true[/code] if this object can be handled by this plugin. Called to allow adding controls at the beginning of the list. Called to allow adding controls at the beginning of the category. Called to allow adding controls at the end of the list. Called to allow adding property specific editors to the inspector. Usually these inherit [EditorProperty]. Returning [code]true[/code] removes the built-in editor for this property, otherwise allows to insert a custom editor before the built-in one. Adds a custom control, not necessarily a property editor. Adds a property editor, this must inherit [EditorProperty]. Adds an editor that allows modifying multiple properties, this must inherit [EditorProperty].