mirror of
https://github.com/scratchfoundation/paper.js.git
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62 lines
1.7 KiB
JavaScript
62 lines
1.7 KiB
JavaScript
/*
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* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
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* http://paperjs.org/
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*
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* Copyright (c) 2011 - 2013, Juerg Lehni & Jonathan Puckey
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* http://lehni.org/ & http://jonathanpuckey.com/
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*
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* Distributed under the MIT license. See LICENSE file for details.
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*
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* All rights reserved.
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*/
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/**
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* @name PaperScopeItem
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*
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* @class A private base class for all classes that have lists and references in
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* the {@link PaperScope} ({@link Project}, {@link View}, {@link Tool}), so
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* functionality can be shared.
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*
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* @private
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*/
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var PaperScopeItem = Base.extend(Callback, /** @lends PaperScopeItem# */{
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/**
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* Creates a PaperScopeItem object.
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*/
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initialize: function(activate) {
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// Store reference to the currently active global paper scope:
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this._scope = paper;
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// Push it onto this._scope[this._list] and set _index:
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this._index = this._scope[this._list].push(this) - 1;
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// If the project has no active reference, activate this one
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if (activate || !this._scope[this._reference])
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this.activate();
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},
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activate: function() {
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if (!this._scope)
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return false;
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var prev = this._scope[this._reference];
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if (prev && prev != this)
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prev.fire('deactivate');
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this._scope[this._reference] = this;
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this.fire('activate', prev);
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return true;
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},
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isActive: function() {
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return this._scope[this._reference] === this;
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},
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remove: function() {
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if (this._index == null)
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return false;
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Base.splice(this._scope[this._list], null, this._index, 1);
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// Clear the active tool reference if it was pointint to this.
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if (this._scope[this._reference] == this)
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this._scope[this._reference] = null;
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this._scope = null;
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return true;
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}
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});
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