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3 |
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4 | import { ArrayExt } from '@lumino/algorithm';
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5 | import { Message } from '@lumino/messaging';
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6 | import { AccordionLayout } from './accordionlayout';
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7 | import { SplitLayout } from './splitlayout';
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8 | import { SplitPanel } from './splitpanel';
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9 | import { Title } from './title';
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10 | import { Widget } from './widget';
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11 |
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12 |
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13 |
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14 |
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15 |
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16 |
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17 |
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18 | export class AccordionPanel extends SplitPanel {
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19 | |
20 |
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21 |
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22 |
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23 |
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24 | constructor(options: AccordionPanel.IOptions = {}) {
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25 | super({ ...options, layout: Private.createLayout(options) });
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26 | this.addClass('lm-AccordionPanel');
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27 | }
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28 |
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29 | |
30 |
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31 |
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32 | get renderer(): AccordionPanel.IRenderer {
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33 | return (this.layout as AccordionLayout).renderer;
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34 | }
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35 |
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36 | |
37 |
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38 |
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39 |
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40 |
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41 |
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42 | get titleSpace(): number {
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43 | return (this.layout as AccordionLayout).titleSpace;
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44 | }
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45 | set titleSpace(value: number) {
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46 | (this.layout as AccordionLayout).titleSpace = value;
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47 | }
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48 |
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49 | |
50 |
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51 |
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52 | get titles(): ReadonlyArray<HTMLElement> {
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53 | return (this.layout as AccordionLayout).titles;
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54 | }
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55 |
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56 | |
57 |
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58 |
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59 |
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60 |
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61 |
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62 |
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63 |
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64 | addWidget(widget: Widget): void {
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65 | super.addWidget(widget);
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66 | widget.title.changed.connect(this._onTitleChanged, this);
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67 | }
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68 |
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69 | |
70 |
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71 |
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72 |
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73 |
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74 |
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75 |
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76 |
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77 |
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78 |
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79 | insertWidget(index: number, widget: Widget): void {
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80 | super.insertWidget(index, widget);
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81 | widget.title.changed.connect(this._onTitleChanged, this);
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82 | }
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83 |
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84 | |
85 |
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86 |
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87 |
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88 |
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89 |
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90 |
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91 |
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92 |
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93 |
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94 | handleEvent(event: Event): void {
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95 | super.handleEvent(event);
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96 | switch (event.type) {
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97 | case 'click':
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98 | this._evtClick(event as MouseEvent);
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99 | break;
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100 | case 'keydown':
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101 | this._eventKeyDown(event as KeyboardEvent);
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102 | break;
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103 | }
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104 | }
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105 |
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106 | |
107 |
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108 |
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109 | protected onBeforeAttach(msg: Message): void {
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110 | this.node.addEventListener('click', this);
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111 | this.node.addEventListener('keydown', this);
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112 | super.onBeforeAttach(msg);
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113 | }
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114 |
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115 | |
116 |
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117 |
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118 | protected onAfterDetach(msg: Message): void {
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119 | super.onAfterDetach(msg);
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120 | this.node.removeEventListener('click', this);
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121 | this.node.removeEventListener('keydown', this);
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122 | }
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123 |
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124 | |
125 |
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126 |
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127 | private _onTitleChanged(sender: Title<Widget>): void {
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128 | const index = ArrayExt.findFirstIndex(this.widgets, widget => {
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129 | return widget.contains(sender.owner);
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130 | });
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131 |
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132 | if (index >= 0) {
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133 | (this.layout as AccordionLayout).updateTitle(index, sender.owner);
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134 | this.update();
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135 | }
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136 | }
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137 |
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138 | |
139 |
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140 |
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141 |
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142 |
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143 |
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144 |
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145 |
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146 |
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147 |
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148 |
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149 |
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150 |
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151 |
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152 | private _computeWidgetSize(index: number): number[] | undefined {
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153 | const layout = this.layout as AccordionLayout;
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154 |
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155 | const widget = layout.widgets[index];
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156 | if (!widget) {
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157 | return undefined;
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158 | }
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159 | const isHidden = widget.isHidden;
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160 | const widgetSizes = layout.absoluteSizes();
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161 | const delta = (isHidden ? -1 : 1) * this.spacing;
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162 | const totalSize = widgetSizes.reduce(
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163 | (prev: number, curr: number) => prev + curr
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164 | );
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165 |
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166 | let newSize = [...widgetSizes];
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167 |
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168 | if (!isHidden) {
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169 |
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170 | const currentSize = widgetSizes[index];
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171 |
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172 | this._widgetSizesCache.set(widget, currentSize);
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173 | newSize[index] = 0;
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174 |
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175 | const widgetToCollapse = newSize.map(sz => sz > 0).lastIndexOf(true);
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176 | if (widgetToCollapse === -1) {
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177 |
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178 | return undefined;
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179 | }
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180 |
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181 | newSize[widgetToCollapse] =
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182 | widgetSizes[widgetToCollapse] + currentSize + delta;
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183 | } else {
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184 |
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185 | const previousSize = this._widgetSizesCache.get(widget);
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186 | if (!previousSize) {
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187 |
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188 | return undefined;
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189 | }
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190 | newSize[index] += previousSize;
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191 |
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192 | const widgetToCollapse = newSize
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193 | .map(sz => sz - previousSize > 0)
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194 | .lastIndexOf(true);
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195 | if (widgetToCollapse === -1) {
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196 |
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197 |
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198 | newSize.forEach((_, idx) => {
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199 | if (idx !== index) {
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200 | newSize[idx] -=
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201 | (widgetSizes[idx] / totalSize) * (previousSize - delta);
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202 | }
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203 | });
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204 | } else {
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205 | newSize[widgetToCollapse] -= previousSize - delta;
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206 | }
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207 | }
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208 | return newSize.map(sz => sz / (totalSize + delta));
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209 | }
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210 | |
211 |
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212 |
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213 | private _evtClick(event: MouseEvent): void {
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214 | const target = event.target as HTMLElement | null;
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215 |
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216 | if (target) {
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217 | const index = ArrayExt.findFirstIndex(this.titles, title => {
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218 | return title.contains(target);
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219 | });
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220 |
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221 | if (index >= 0) {
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222 | event.preventDefault();
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223 | event.stopPropagation();
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224 | const title = this.titles[index];
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225 | const widget = (this.layout as AccordionLayout).widgets[index];
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226 |
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227 | const newSize = this._computeWidgetSize(index);
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228 | if (newSize) {
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229 | this.setRelativeSizes(newSize, false);
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230 | }
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231 |
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232 | if (widget.isHidden) {
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233 | title.classList.add('lm-mod-expanded');
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234 | title.setAttribute('aria-expanded', 'true');
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235 | widget.show();
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236 | } else {
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237 | title.classList.remove('lm-mod-expanded');
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238 | title.setAttribute('aria-expanded', 'false');
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239 | widget.hide();
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240 | }
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241 | }
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242 | }
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243 | }
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244 |
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245 | |
246 |
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247 |
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248 | private _eventKeyDown(event: KeyboardEvent): void {
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249 | if (event.defaultPrevented) {
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250 | return;
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251 | }
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252 |
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253 | const target = event.target as HTMLElement | null;
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254 | let handled = false;
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255 | if (target) {
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256 | const index = ArrayExt.findFirstIndex(this.titles, title => {
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257 | return title.contains(target);
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258 | });
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259 |
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260 | if (index >= 0) {
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261 | const keyCode = event.keyCode.toString();
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262 |
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263 |
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264 | if (event.key.match(/Space|Enter/) || keyCode.match(/13|32/)) {
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265 | target.click();
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266 | handled = true;
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267 | } else if (
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268 | this.orientation === 'horizontal'
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269 | ? event.key.match(/ArrowLeft|ArrowRight/) || keyCode.match(/37|39/)
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270 | : event.key.match(/ArrowUp|ArrowDown/) || keyCode.match(/38|40/)
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271 | ) {
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272 |
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273 | const direction =
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274 | event.key.match(/ArrowLeft|ArrowUp/) || keyCode.match(/37|38/)
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275 | ? -1
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276 | : 1;
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277 | const length = this.titles.length;
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278 | const newIndex = (index + length + direction) % length;
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279 |
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280 | this.titles[newIndex].focus();
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281 | handled = true;
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282 | } else if (event.key === 'End' || keyCode === '35') {
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283 |
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284 | this.titles[this.titles.length - 1].focus();
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285 | handled = true;
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286 | } else if (event.key === 'Home' || keyCode === '36') {
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287 |
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288 | this.titles[0].focus();
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289 | handled = true;
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290 | }
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291 | }
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292 |
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293 | if (handled) {
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294 | event.preventDefault();
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295 | }
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296 | }
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297 | }
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298 |
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299 | private _widgetSizesCache: WeakMap<Widget, number> = new WeakMap();
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300 | }
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301 |
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302 |
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303 |
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304 |
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305 | export namespace AccordionPanel {
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306 | |
307 |
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308 |
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309 | export type Orientation = SplitLayout.Orientation;
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310 |
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311 | |
312 |
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313 |
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314 | export type Alignment = SplitLayout.Alignment;
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315 |
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316 | |
317 |
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318 |
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319 | export type IRenderer = AccordionLayout.IRenderer;
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320 |
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321 | |
322 |
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323 |
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324 | export interface IOptions extends Partial<AccordionLayout.IOptions> {
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325 | |
326 |
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327 |
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328 |
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329 |
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330 |
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331 |
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332 | layout?: AccordionLayout;
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333 | }
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334 |
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335 | |
336 |
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337 |
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338 | export class Renderer extends SplitPanel.Renderer implements IRenderer {
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339 | |
340 |
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341 |
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342 | readonly titleClassName = 'lm-AccordionPanel-title';
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343 |
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344 | |
345 |
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346 |
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347 |
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348 |
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349 |
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350 |
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351 | createCollapseIcon(data: Title<Widget>): HTMLElement {
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352 | return document.createElement('span');
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353 | }
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354 |
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355 | |
356 |
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357 |
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358 |
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359 |
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360 |
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361 |
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362 | createSectionTitle(data: Title<Widget>): HTMLElement {
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363 | const handle = document.createElement('h3');
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364 | handle.setAttribute('role', 'button');
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365 | handle.setAttribute('tabindex', '0');
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366 | handle.id = this.createTitleKey(data);
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367 | handle.className = this.titleClassName;
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368 | handle.title = data.caption;
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369 | for (const aData in data.dataset) {
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370 | handle.dataset[aData] = data.dataset[aData];
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371 | }
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372 |
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373 | const collapser = handle.appendChild(this.createCollapseIcon(data));
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374 | collapser.className = 'lm-AccordionPanel-titleCollapser';
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375 |
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376 | const label = handle.appendChild(document.createElement('span'));
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377 | label.className = 'lm-AccordionPanel-titleLabel';
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378 | label.textContent = data.label;
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379 |
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380 | return handle;
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381 | }
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382 |
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383 | |
384 |
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385 |
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386 |
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387 |
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388 |
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389 |
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390 |
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391 |
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392 |
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393 |
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394 | createTitleKey(data: Title<Widget>): string {
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395 | let key = this._titleKeys.get(data);
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396 | if (key === undefined) {
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397 | key = `title-key-${this._titleID++}`;
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398 | this._titleKeys.set(data, key);
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399 | }
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400 | return key;
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401 | }
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402 |
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403 | private _titleID = 0;
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404 | private _titleKeys = new WeakMap<Title<Widget>, string>();
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405 | }
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406 |
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407 | |
408 |
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409 |
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410 | export const defaultRenderer = new Renderer();
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411 | }
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412 |
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413 | namespace Private {
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414 | |
415 |
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416 |
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417 |
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418 |
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419 |
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420 | export function createLayout(
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421 | options: AccordionPanel.IOptions
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422 | ): AccordionLayout {
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423 | return (
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424 | options.layout ||
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425 | new AccordionLayout({
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426 | renderer: options.renderer || AccordionPanel.defaultRenderer,
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427 | orientation: options.orientation,
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428 | alignment: options.alignment,
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429 | spacing: options.spacing,
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430 | titleSpace: options.titleSpace
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431 | })
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432 | );
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433 | }
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434 | }
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