mirror of
https://github.com/google/blockly.git
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106 lines
2.7 KiB
JavaScript
106 lines
2.7 KiB
JavaScript
/**
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* @license
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* Copyright 2019 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview Namespace for block rendering functionality.
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* @author fenichel@google.com (Rachel Fenichel)
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*/
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'use strict';
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/**
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* The top level namespace for block rendering.
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* @namespace Blockly.blockRendering
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*/
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goog.provide('Blockly.blockRendering');
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goog.require('Blockly.utils.object');
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/**
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* The set of all registered renderers, keyed by their name.
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* @type {!Object<string, !Function>}
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* @private
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*/
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Blockly.blockRendering.rendererMap_ = {};
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/**
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* Whether or not the debugger is turned on.
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* @type {boolean}
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* @package
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*/
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Blockly.blockRendering.useDebugger = false;
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/**
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* Registers a new renderer.
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* @param {string} name The name of the renderer.
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* @param {!Function} rendererClass The new renderer class
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* to register.
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* @throws {Error} if a renderer with the same name has already been registered.
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*/
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Blockly.blockRendering.register = function(name, rendererClass) {
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if (Blockly.blockRendering.rendererMap_[name]) {
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throw Error('Renderer has already been registered.');
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}
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Blockly.blockRendering.rendererMap_[name] = rendererClass;
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};
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/**
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* Unregisters the renderer registered with the given name.
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* @param {string} name The name of the renderer.
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*/
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Blockly.blockRendering.unregister = function(name) {
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if (Blockly.blockRendering.rendererMap_[name]) {
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delete Blockly.blockRendering.rendererMap_[name];
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} else {
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console.warn('No renderer mapping for name "' + name +
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'" found to unregister');
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}
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};
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/**
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* Turn on the blocks debugger.
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* @package
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*/
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Blockly.blockRendering.startDebugger = function() {
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Blockly.blockRendering.useDebugger = true;
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};
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/**
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* Turn off the blocks debugger.
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* @package
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*/
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Blockly.blockRendering.stopDebugger = function() {
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Blockly.blockRendering.useDebugger = false;
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};
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/**
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* Initialize anything needed for rendering (constants, etc).
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* @param {!string} name Name of the renderer to initialize.
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* @return {!Blockly.blockRendering.Renderer} The new instance of a renderer.
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* Already initialized.
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* @package
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*/
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Blockly.blockRendering.init = function(name) {
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if (!Blockly.blockRendering.rendererMap_[name]) {
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throw Error('Renderer not registered: ', name);
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}
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/**
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* Wrap the renderer constructor into a temporary constructor
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* function so the closure compiler treats it as a constructor.
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* @param {string} name The renderer name.
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* @constructor
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* @extends {Blockly.blockRendering.Renderer}
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*/
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var rendererCtor = function(name) {
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rendererCtor.superClass_.constructor.call(this, name);
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};
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Blockly.utils.object.inherits(rendererCtor,
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Blockly.blockRendering.rendererMap_[name]);
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var renderer = new rendererCtor(name);
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renderer.init();
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return renderer;
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};
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