mirror of
https://github.com/wanglin2/mind-map.git
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307 lines
7.9 KiB
JavaScript
307 lines
7.9 KiB
JavaScript
import { CONSTANTS } from '../../constants/constant'
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// 视图操作类
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class View {
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// 构造函数
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constructor(opt = {}) {
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this.opt = opt
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this.mindMap = this.opt.mindMap
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this.scale = 1
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this.sx = 0
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this.sy = 0
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this.x = 0
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this.y = 0
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this.firstDrag = true
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this.setTransformData(this.mindMap.opt.viewData)
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this.bind()
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}
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// 绑定
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bind() {
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// 快捷键
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this.mindMap.keyCommand.addShortcut('Control+=', () => {
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this.enlarge()
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})
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this.mindMap.keyCommand.addShortcut('Control+-', () => {
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this.narrow()
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})
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this.mindMap.keyCommand.addShortcut('Control+Enter', () => {
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this.reset()
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})
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this.mindMap.keyCommand.addShortcut('Control+i', () => {
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this.fit()
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})
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this.mindMap.svg.on('dblclick', () => {
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this.reset()
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})
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// 拖动视图
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this.mindMap.event.on('mousedown', () => {
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this.sx = this.x
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this.sy = this.y
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})
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this.mindMap.event.on('drag', (e, event) => {
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if (e.ctrlKey) {
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// 按住ctrl键拖动为多选
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return
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}
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if (this.firstDrag) {
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this.firstDrag = false
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// 清除激活节点
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if (this.mindMap.renderer.activeNodeList.length > 0) {
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this.mindMap.execCommand('CLEAR_ACTIVE_NODE')
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}
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}
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this.x = this.sx + event.mousemoveOffset.x
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this.y = this.sy + event.mousemoveOffset.y
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this.transform()
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})
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this.mindMap.event.on('mouseup', () => {
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this.firstDrag = true
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})
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// 放大缩小视图
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this.mindMap.event.on('mousewheel', (e, dir, event, isTouchPad) => {
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let {
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customHandleMousewheel,
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mousewheelAction,
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mouseScaleCenterUseMousePosition,
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mousewheelMoveStep,
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mousewheelZoomActionReverse
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} = this.mindMap.opt
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// 是否自定义鼠标滚轮事件
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if (
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customHandleMousewheel &&
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typeof customHandleMousewheel === 'function'
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) {
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return customHandleMousewheel(e)
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}
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// 鼠标滚轮事件控制缩放
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if (mousewheelAction === CONSTANTS.MOUSE_WHEEL_ACTION.ZOOM) {
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let cx = mouseScaleCenterUseMousePosition ? e.clientX : undefined
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let cy = mouseScaleCenterUseMousePosition ? e.clientY : undefined
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switch (dir) {
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// 鼠标滚轮，向上和向左，都是缩小
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case CONSTANTS.DIR.UP:
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case CONSTANTS.DIR.LEFT:
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mousewheelZoomActionReverse
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? this.enlarge(cx, cy, isTouchPad)
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: this.narrow(cx, cy, isTouchPad)
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break
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// 鼠标滚轮，向下和向右，都是放大
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case CONSTANTS.DIR.DOWN:
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case CONSTANTS.DIR.RIGHT:
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mousewheelZoomActionReverse
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? this.narrow(cx, cy, isTouchPad)
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: this.enlarge(cx, cy, isTouchPad)
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break
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}
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} else {
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// 鼠标滚轮事件控制画布移动
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let step = mousewheelMoveStep
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if (isTouchPad) {
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step = 5
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}
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switch (dir) {
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// 上移
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case CONSTANTS.DIR.DOWN:
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this.translateY(-step)
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break
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// 下移
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case CONSTANTS.DIR.UP:
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this.translateY(step)
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break
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// 右移
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case CONSTANTS.DIR.LEFT:
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this.translateX(-step)
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break
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// 左移
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case CONSTANTS.DIR.RIGHT:
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this.translateX(step)
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break
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}
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}
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})
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}
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// 获取当前变换状态数据
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getTransformData() {
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return {
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transform: this.mindMap.draw.transform(),
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state: {
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scale: this.scale,
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x: this.x,
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y: this.y,
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sx: this.sx,
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sy: this.sy
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}
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}
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}
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// 动态设置变换状态数据
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setTransformData(viewData) {
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if (viewData) {
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Object.keys(viewData.state).forEach(prop => {
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this[prop] = viewData.state[prop]
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})
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this.mindMap.draw.transform({
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...viewData.transform
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})
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this.mindMap.emit('view_data_change', this.getTransformData())
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this.mindMap.emit('scale', this.scale)
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}
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}
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// 平移x,y方向
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translateXY(x, y) {
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if (x === 0 && y === 0) return
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this.x += x
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this.y += y
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this.transform()
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}
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// 平移x方向
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translateX(step) {
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if (step === 0) return
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this.x += step
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this.transform()
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}
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// 平移x方式到
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translateXTo(x) {
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if (x === 0) return
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this.x = x
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this.transform()
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}
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// 平移y方向
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translateY(step) {
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if (step === 0) return
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this.y += step
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this.transform()
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}
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// 平移y方向到
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translateYTo(y) {
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if (y === 0) return
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this.y = y
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this.transform()
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}
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// 应用变换
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transform() {
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this.mindMap.draw.transform({
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origin: [0, 0],
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scale: this.scale,
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translate: [this.x, this.y]
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})
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this.mindMap.emit('view_data_change', this.getTransformData())
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}
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// 恢复
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reset() {
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let scaleChange = this.scale !== 1
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this.scale = 1
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this.x = 0
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this.y = 0
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this.transform()
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if (scaleChange) {
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this.mindMap.emit('scale', this.scale)
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}
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}
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// 缩小
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narrow(cx, cy, isTouchPad) {
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const scaleRatio = this.mindMap.opt.scaleRatio / (isTouchPad ? 5 : 1)
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const scale = Math.max(this.scale - scaleRatio, 0.1)
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this.scaleInCenter(scale, cx, cy)
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this.transform()
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this.mindMap.emit('scale', this.scale)
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}
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// 放大
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enlarge(cx, cy, isTouchPad) {
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const scaleRatio = this.mindMap.opt.scaleRatio / (isTouchPad ? 5 : 1)
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const scale = this.scale + scaleRatio
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this.scaleInCenter(scale, cx, cy)
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this.transform()
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this.mindMap.emit('scale', this.scale)
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}
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// 基于指定中心进行缩放，cx，cy 可不指定，此时会使用画布中心点
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scaleInCenter(scale, cx, cy) {
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if (cx === undefined || cy === undefined) {
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cx = this.mindMap.width / 2
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cy = this.mindMap.height / 2
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}
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const prevScale = this.scale
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const ratio = 1 - scale / prevScale
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const dx = (cx - this.x) * ratio
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const dy = (cy - this.y) * ratio
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this.x += dx
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this.y += dy
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this.scale = scale
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}
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// 设置缩放
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setScale(scale, cx, cy) {
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if (cx !== undefined && cy !== undefined) {
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this.scaleInCenter(scale, cx, cy)
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} else {
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this.scale = scale
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}
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this.transform()
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this.mindMap.emit('scale', this.scale)
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}
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// 适应画布大小
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fit() {
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let { fitPadding } = this.mindMap.opt
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let draw = this.mindMap.draw
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let origTransform = draw.transform()
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let rect = draw.rbox()
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let drawWidth = rect.width / origTransform.scaleX
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let drawHeight = rect.height / origTransform.scaleY
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let drawRatio = drawWidth / drawHeight
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let { width: elWidth, height: elHeight } =
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this.mindMap.el.getBoundingClientRect()
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elWidth = elWidth - fitPadding * 2
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elHeight = elHeight - fitPadding * 2
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let elRatio = elWidth / elHeight
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let newScale = 0
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let flag = ''
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if (drawWidth <= elWidth && drawHeight <= elHeight) {
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newScale = 1
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flag = 1
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} else {
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let newWidth = 0
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let newHeight = 0
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if (drawRatio > elRatio) {
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newWidth = elWidth
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newHeight = elWidth / drawRatio
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flag = 2
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} else {
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newHeight = elHeight
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newWidth = elHeight * drawRatio
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flag = 3
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}
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newScale = newWidth / drawWidth
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}
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this.setScale(newScale)
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let newRect = draw.rbox()
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let newX = 0
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let newY = 0
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if (flag === 1) {
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newX = -newRect.x + fitPadding + (elWidth - newRect.width) / 2
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newY = -newRect.y + fitPadding + (elHeight - newRect.height) / 2
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} else if (flag === 2) {
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newX = -newRect.x + fitPadding
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newY = -newRect.y + fitPadding + (elHeight - newRect.height) / 2
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} else if (flag === 3) {
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newX = -newRect.x + fitPadding + (elWidth - newRect.width) / 2
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newY = -newRect.y + fitPadding
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}
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this.translateXY(newX, newY)
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}
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}
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export default View
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