1 | import Parchment from 'parchment';
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2 | import Emitter from '../core/emitter';
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3 | import Block, { BlockEmbed } from './block';
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4 | import Break from './break';
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5 | import CodeBlock from '../formats/code';
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6 | import Container from './container';
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7 |
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8 |
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9 | function isLine(blot) {
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10 | return (blot instanceof Block || blot instanceof BlockEmbed);
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11 | }
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12 |
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13 |
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14 | class Scroll extends Parchment.Scroll {
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15 | constructor(domNode, config) {
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16 | super(domNode);
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17 | this.emitter = config.emitter;
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18 | if (Array.isArray(config.whitelist)) {
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19 | this.whitelist = config.whitelist.reduce(function(whitelist, format) {
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20 | whitelist[format] = true;
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21 | return whitelist;
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22 | }, {});
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23 | }
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24 |
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25 | this.domNode.addEventListener('DOMNodeInserted', function() {});
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26 | this.optimize();
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27 | this.enable();
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28 | }
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29 |
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30 | batchStart() {
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31 | this.batch = true;
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32 | }
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33 |
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34 | batchEnd() {
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35 | this.batch = false;
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36 | this.optimize();
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37 | }
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38 |
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39 | deleteAt(index, length) {
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40 | let [first, offset] = this.line(index);
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41 | let [last, ] = this.line(index + length);
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42 | super.deleteAt(index, length);
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43 | if (last != null && first !== last && offset > 0) {
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44 | if (first instanceof BlockEmbed || last instanceof BlockEmbed) {
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45 | this.optimize();
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46 | return;
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47 | }
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48 | if (first instanceof CodeBlock) {
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49 | let newlineIndex = first.newlineIndex(first.length(), true);
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50 | if (newlineIndex > -1) {
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51 | first = first.split(newlineIndex + 1);
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52 | if (first === last) {
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53 | this.optimize();
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54 | return;
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55 | }
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56 | }
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57 | } else if (last instanceof CodeBlock) {
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58 | let newlineIndex = last.newlineIndex(0);
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59 | if (newlineIndex > -1) {
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60 | last.split(newlineIndex + 1);
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61 | }
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62 | }
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63 | let ref = last.children.head instanceof Break ? null : last.children.head;
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64 | first.moveChildren(last, ref);
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65 | first.remove();
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66 | }
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67 | this.optimize();
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68 | }
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69 |
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70 | enable(enabled = true) {
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71 | this.domNode.setAttribute('contenteditable', enabled);
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72 | }
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73 |
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74 | formatAt(index, length, format, value) {
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75 | if (this.whitelist != null && !this.whitelist[format]) return;
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76 | super.formatAt(index, length, format, value);
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77 | this.optimize();
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78 | }
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79 |
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80 | insertAt(index, value, def) {
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81 | if (def != null && this.whitelist != null && !this.whitelist[value]) return;
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82 | if (index >= this.length()) {
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83 | if (def == null || Parchment.query(value, Parchment.Scope.BLOCK) == null) {
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84 | let blot = Parchment.create(this.statics.defaultChild);
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85 | this.appendChild(blot);
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86 | if (def == null && value.endsWith('\n')) {
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87 | value = value.slice(0, -1);
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88 | }
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89 | blot.insertAt(0, value, def);
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90 | } else {
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91 | let embed = Parchment.create(value, def);
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92 | this.appendChild(embed);
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93 | }
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94 | } else {
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95 | super.insertAt(index, value, def);
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96 | }
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97 | this.optimize();
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98 | }
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99 |
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100 | insertBefore(blot, ref) {
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101 | if (blot.statics.scope === Parchment.Scope.INLINE_BLOT) {
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102 | let wrapper = Parchment.create(this.statics.defaultChild);
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103 | wrapper.appendChild(blot);
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104 | blot = wrapper;
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105 | }
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106 | super.insertBefore(blot, ref);
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107 | }
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108 |
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109 | leaf(index) {
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110 | return this.path(index).pop() || [null, -1];
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111 | }
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112 |
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113 | line(index) {
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114 | if (index === this.length()) {
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115 | return this.line(index - 1);
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116 | }
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117 | return this.descendant(isLine, index);
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118 | }
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119 |
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120 | lines(index = 0, length = Number.MAX_VALUE) {
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121 | let getLines = (blot, index, length) => {
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122 | let lines = [], lengthLeft = length;
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123 | blot.children.forEachAt(index, length, function(child, index, length) {
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124 | if (isLine(child)) {
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125 | lines.push(child);
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126 | } else if (child instanceof Parchment.Container) {
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127 | lines = lines.concat(getLines(child, index, lengthLeft));
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128 | }
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129 | lengthLeft -= length;
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130 | });
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131 | return lines;
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132 | };
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133 | return getLines(this, index, length);
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134 | }
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135 |
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136 | optimize(mutations = [], context = {}) {
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137 | if (this.batch === true) return;
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138 | super.optimize(mutations, context);
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139 | if (mutations.length > 0) {
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140 | this.emitter.emit(Emitter.events.SCROLL_OPTIMIZE, mutations, context);
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141 | }
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142 | }
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143 |
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144 | path(index) {
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145 | return super.path(index).slice(1);
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146 | }
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147 |
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148 | update(mutations) {
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149 | if (this.batch === true) return;
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150 | let source = Emitter.sources.USER;
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151 | if (typeof mutations === 'string') {
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152 | source = mutations;
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153 | }
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154 | if (!Array.isArray(mutations)) {
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155 | mutations = this.observer.takeRecords();
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156 | }
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157 | if (mutations.length > 0) {
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158 | this.emitter.emit(Emitter.events.SCROLL_BEFORE_UPDATE, source, mutations);
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159 | }
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160 | super.update(mutations.concat([]));
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161 | if (mutations.length > 0) {
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162 | this.emitter.emit(Emitter.events.SCROLL_UPDATE, source, mutations);
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163 | }
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164 | }
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165 | }
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166 | Scroll.blotName = 'scroll';
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167 | Scroll.className = 'ql-editor';
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168 | Scroll.tagName = 'DIV';
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169 | Scroll.defaultChild = 'block';
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170 | Scroll.allowedChildren = [Block, BlockEmbed, Container];
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171 |
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172 |
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173 | export default Scroll;
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