mirror of
https://github.com/scratchfoundation/paper.js.git
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112 lines
2.9 KiB
JavaScript
112 lines
2.9 KiB
JavaScript
/*
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* Paper.js
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*
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* This file is part of Paper.js, a JavaScript Vector Graphics Library,
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* based on Scriptographer.org and designed to be largely API compatible.
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* http://paperjs.org/
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* http://scriptographer.org/
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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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* Copyright (c) 2011, Juerg Lehni & Jonathan Puckey
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* http://lehni.org/ & http://jonathanpuckey.com/
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*
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* All rights reserved.
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*/
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var Layer = this.Layer = Group.extend({
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/** @lends Layer# */
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// DOCS: improve constructor code example.
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/**
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* Creates a new Layer item and places it at the end of the
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* {@link Project#layers} array. The newly created layer will be activated,
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* so all newly created items will be placed within it.
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*
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* @param {Item[]} [children] An array of items that will be added to the
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* newly created layer.
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*
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* @example
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* var layer = new Layer();
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*
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* @class The Layer item represents a layer in a Paper.js project.
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*
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* The layer which is currently active can be accessed through
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* {@link Project#activeLayer}.
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* An array of all layers in a project can be accessed through
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* {@link Project#layers}.
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*
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* @extends Group
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* @constructs Layer
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*/
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initialize: function(items) {
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this._project = paper.project;
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// Push it onto project.layers and set index:
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this._index = this._project.layers.push(this) - 1;
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this.base.apply(this, arguments);
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this.activate();
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},
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/**
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* Removes the layer from its project's layers list
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* or its parent's children list.
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*/
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_remove: function(deselect, notify) {
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if (this._parent)
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return this.base(deselect, notify);
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if (this._index != null) {
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if (deselect)
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this.setSelected(false);
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Base.splice(this._project.layers, null, this._index, 1);
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// Tell project we need a redraw. This is similar to _changed()
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// mechanism.
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this._project._needsRedraw();
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return true;
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}
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return false;
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},
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getNextSibling: function() {
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return this._parent ? this.base()
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: this._project.layers[this._index + 1] || null;
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},
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getPreviousSibling: function() {
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return this._parent ? this.base()
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: this._project.layers[this._index - 1] || null;
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},
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// DOCS: improve Layer#activate() example.
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/**
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* Activates the layer.
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*
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* @example
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* var layer = new Layer();
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* layer.activate();
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* console.log(project.activeLayer == layer); // true
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*/
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activate: function() {
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this._project.activeLayer = this;
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}
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}, new function () {
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function insert(above) {
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return function(item) {
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// If the item is a layer and contained within Project#layers, use
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// our own version of move().
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if (item instanceof Layer && !item._parent
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&& this._remove(false, true)) {
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Base.splice(item._project.layers, [this],
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item._index + (above ? 1 : -1), 0);
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this._setProject(item._project);
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return true;
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}
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return this.base(item);
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};
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}
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return {
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insertAbove: insert(true),
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insertBelow: insert(false)
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};
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});
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