define(['svg/SVGUtilities'], (svg) => { 'use strict'; // Simplified text block renderer, which assumes all characters render as // 1x1 px squares for repeatable renders in all browsers function merge(state, newState) { for(let k in state) { if(state.hasOwnProperty(k)) { if(newState[k] !== null && newState[k] !== undefined) { state[k] = newState[k]; } } } } class SVGTextBlock { constructor(container, initialState = {}) { this.container = container; this.state = { attrs: {}, text: '', x: 0, y: 0, }; this.width = 0; this.height = 0; this.nodes = []; this.set(initialState); } _rebuildNodes(count) { if(count > this.nodes.length) { const attrs = Object.assign({ 'x': this.state.x, }, this.state.attrs); while(this.nodes.length < count) { const element = svg.make('text', attrs); const text = svg.makeText(); element.appendChild(text); this.container.appendChild(element); this.nodes.push({element, text}); } } else { while(this.nodes.length > count) { const {element} = this.nodes.pop(); this.container.removeChild(element); } } } _reset() { this._rebuildNodes(0); this.width = 0; this.height = 0; } _renderText() { if(!this.state.text) { this._reset(); return; } const lines = this.state.text.split('\n'); this._rebuildNodes(lines.length); let maxWidth = 0; this.nodes.forEach(({text, element}, i) => { text.nodeValue = lines[i]; maxWidth = Math.max(maxWidth, lines[i].length); }); this.width = maxWidth; } _updateX() { this.nodes.forEach(({element}) => { element.setAttribute('x', this.state.x); }); } _updateY() { this.nodes.forEach(({element}, i) => { element.setAttribute('y', this.state.y + i); }); this.height = this.nodes.length; } firstLine() { if(this.nodes.length > 0) { return this.nodes[0].element; } else { return null; } } set(newState) { const oldState = Object.assign({}, this.state); merge(this.state, newState); if(this.state.attrs !== oldState.attrs) { this._reset(); oldState.text = ''; } const oldNodes = this.nodes.length; if(this.state.text !== oldState.text) { this._renderText(); } if(this.state.x !== oldState.x) { this._updateX(); } if(this.state.y !== oldState.y || this.nodes.length !== oldNodes) { this._updateY(); } } } class SizeTester { measure(attrs, content) { if(!content) { return {width: 0, height: 0}; } const lines = content.split('\n'); let width = 0; lines.forEach((line) => { width = Math.max(width, line.length); }); return { width, height: lines.length, }; } measureHeight(attrs, content) { if(!content) { return 0; } return content.split('\n').length; } resetCache() { } detach() { } } SVGTextBlock.SizeTester = SizeTester; return SVGTextBlock; });