mirror of
https://github.com/scratchfoundation/scratch-blocks.git
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103 lines
3.4 KiB
JavaScript
103 lines
3.4 KiB
JavaScript
/**
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* @license
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* Visual Blocks Editor
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*
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* Copyright 2018 Google Inc.
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* https://developers.google.com/blockly/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Utility methods for Scratch Blocks but not Blockly.
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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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* @name Blockly.scratchBlocksUtils
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* @namespace
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**/
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goog.provide('Blockly.scratchBlocksUtils');
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/**
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* Measure some text using a canvas in-memory.
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* Does not exist in Blockly, but needed in scratch-blocks
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* @param {string} fontSize E.g., '10pt'
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* @param {string} fontFamily E.g., 'Arial'
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* @param {string} fontWeight E.g., '600'
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* @param {string} text The actual text to measure
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* @return {number} Width of the text in px.
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* @package
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*/
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Blockly.scratchBlocksUtils.measureText = function(fontSize, fontFamily,
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fontWeight, text) {
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var canvas = document.createElement('canvas');
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var context = canvas.getContext('2d');
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context.font = fontWeight + ' ' + fontSize + ' ' + fontFamily;
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return context.measureText(text).width;
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};
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/**
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* Encode a string's HTML entities.
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* E.g., <a> -> <a>
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* Does not exist in Blockly, but needed in scratch-blocks
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* @param {string} rawStr Unencoded raw string to encode.
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* @return {string} String with HTML entities encoded.
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* @package
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*/
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Blockly.scratchBlocksUtils.encodeEntities = function(rawStr) {
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// CC-BY-SA https://stackoverflow.com/questions/18749591/encode-html-entities-in-javascript
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return rawStr.replace(/[\u00A0-\u9999<>&]/gim, function(i) {
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return '&#' + i.charCodeAt(0) + ';';
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});
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};
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/**
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* Re-assign obscured shadow blocks new IDs to prevent collisions
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* Scratch specific to help the VM handle deleting obscured shadows.
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* @param {Blockly.Block} block the root block to be processed.
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* @package
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*/
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Blockly.scratchBlocksUtils.changeObscuredShadowIds = function(block) {
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var blocks = block.getDescendants();
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for (var i = blocks.length - 1; i >= 0; i--) {
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var descendant = blocks[i];
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for (var j = 0; j < descendant.inputList.length; j++) {
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var connection = descendant.inputList[j].connection;
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if (connection) {
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var shadowDom = connection.getShadowDom();
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if (shadowDom) {
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shadowDom.setAttribute('id', Blockly.utils.genUid());
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connection.setShadowDom(shadowDom);
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}
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}
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}
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}
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};
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/**
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* Whether a block is both a shadow block and an argument reporter. These
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* blocks have special behaviour in scratch-blocks: they're duplicated when
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* dragged, and they are rendered slightly differently from normal shadow
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* blocks.
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* @param {!Blockly.BlockSvg} block The block that should be used to make this
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* decision.
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* @return {boolean} True if the block should be duplicated on drag.
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* @package
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*/
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Blockly.scratchBlocksUtils.isShadowArgumentReporter = function(block) {
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return (block.isShadow() && (block.type == 'argument_reporter_boolean' ||
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block.type == 'argument_reporter_string_number'));
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};
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