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{ each, isArray, isFunction, isString, debounce, throttle } from '@antv/util';\nimport { View } from '../chart';\nimport { ActionCallback, IAction, IInteractionContext, LooseObject } from '../interface';\nimport { createAction, createCallbackAction } from './action/register';\nimport InteractionContext from './context';\nimport Interaction from './interaction';\n\n// 将字符串转换成 action\nexport function parseAction(actionStr: string, context: IInteractionContext, arg?: any): ActionObject {\n const arr = actionStr.split(':');\n const actionName = arr[0];\n // 如果已经初始化过 action ，则直接引用之前的 action\n const action = context.getAction(actionName) || createAction(actionName, context);\n if (!action) {\n throw new Error(`There is no action named ${actionName}`);\n }\n const methodName = arr[1];\n return {\n action,\n methodName,\n arg,\n };\n}\n\n// 执行 Action\nfunction executeAction(actionObject: ActionObject) {\n const { action, methodName, arg } = actionObject;\n if (action[methodName]) {\n action[methodName](arg);\n } else {\n throw new Error(`Action(${action.name}) doesn't have a method called ${methodName}`);\n }\n}\n\nconst STEP_NAMES = {\n START: 'start',\n SHOW_ENABLE: 'showEnable',\n END: 'end',\n ROLLBACK: 'rollback',\n PROCESSING: 'processing',\n};\n\n/** 交互环节的定义 */\nexport interface InteractionStep {\n /**\n * 触发事件，支持 view，chart 的各种事件，也支持 document、window 的事件\n */\n trigger: string;\n /**\n * 是否可以触发 action\n * @param context - 交互的上下文\n */\n isEnable?: (context: IInteractionContext) => boolean;\n /**\n * 反馈，支持三种方式：\n * - action:method : action 的名字和方法的组合\n * - [’action1:method1‘, ’action2:method‘]\n * - ActionCallback: 回调函数\n */\n action: string | string[] | ActionCallback;\n /**\n * 反馈，具体 action method 的参数：\n * - 当传递多个 action 时，args 必须是一个数组\n */\n arg?: any | any[];\n /**\n * 回调函数，action 执行后执行\n */\n callback?: (context: IInteractionContext) => void;\n /**\n * @private\n * 不需要用户传入，通过上面的属性计算出来的属性\n */\n actionObject?: ActionObject | ActionObject[];\n /**\n * 在一个环节内是否只允许执行一次\n */\n once?: boolean;\n /**\n * 是否增加节流\n */\n throttle?: ThrottleOption;\n /**\n * 是否延迟\n */\n debounce?: DebounceOption;\n}\n\n// action 执行时支持 debounce 和 throttle，可以参考：https://css-tricks.com/debouncing-throttling-explained-examples/\n/**\n * debounce 的配置\n */\nexport interface DebounceOption {\n /**\n * 等待时间\n */\n wait: number;\n /**\n * 是否马上执行\n */\n immediate?: boolean;\n}\n\n/**\n * throttle 的配置\n */\nexport interface ThrottleOption {\n /**\n * 等待时间\n */\n wait: number;\n /**\n * 马上就执行\n */\n leading?: boolean;\n /**\n * 执行完毕后再执行一次\n */\n trailing?: boolean;\n}\n\n/** 缓存 action 对象，仅用于当前文件 */\ninterface ActionObject {\n /**\n * 缓存的 action\n */\n action: IAction;\n /**\n * action 的方法\n */\n methodName: string;\n /**\n * 用户传递的 action 方法的参数\n */\n arg?: any;\n}\n\n/** 交互的所有环节 */\nexport interface InteractionSteps {\n /**\n * 显示交互可以进行\n */\n showEnable?: InteractionStep[];\n /**\n * 交互开始\n */\n start?: InteractionStep[];\n /**\n * 交互持续\n */\n processing?: InteractionStep[];\n /**\n * 交互结束\n */\n end?: InteractionStep[];\n /**\n * 交互回滚\n */\n rollback?: InteractionStep[];\n}\n\n/**\n * 支持语法的交互类\n */\nexport default class GrammarInteraction extends Interaction {\n // 存储的交互环节\n private steps: InteractionSteps;\n /** 当前执行到的阶段 */\n public currentStepName: string;\n /**\n * 当前交互的上下文\n */\n public context: IInteractionContext;\n\n private callbackCaches: LooseObject = {};\n // 某个触发和反馈在本环节是否执行或\n private emitCaches: LooseObject = {};\n\n constructor(view: View, steps: InteractionSteps) {\n super(view, steps);\n this.steps = steps;\n }\n\n /**\n * 初始化\n */\n public init() {\n this.initContext();\n super.init();\n }\n\n /**\n * 清理资源\n */\n public destroy() {\n super.destroy(); // 先清理事件\n this.steps = null;\n if (this.context) {\n this.context.destroy();\n this.context = null;\n }\n\n this.callbackCaches = null;\n this.view = null;\n }\n\n /**\n * 绑定事件\n */\n protected initEvents() {\n each(this.steps, (stepArr, stepName) => {\n each(stepArr, (step) => {\n const callback = this.getActionCallback(stepName, step);\n if (callback) {\n // 如果存在 callback，才绑定，有时候会出现无 callback 的情况\n this.bindEvent(step.trigger, callback);\n }\n });\n });\n }\n\n /**\n * 清理绑定的事件\n */\n protected clearEvents() {\n each(this.steps, (stepArr, stepName) => {\n each(stepArr, (step) => {\n const callback = this.getActionCallback(stepName, step);\n if (callback) {\n this.offEvent(step.trigger, callback);\n }\n });\n });\n }\n\n // 初始化上下文，并初始化 action\n private initContext() {\n const view = this.view;\n const context = new InteractionContext(view);\n this.context = context;\n const steps = this.steps;\n // 生成具体的 Action\n each(steps, (subSteps: InteractionStep[]) => {\n each(subSteps, (step: InteractionStep) => {\n if (isFunction(step.action)) {\n // 如果传入回调函数，则直接生成 CallbackAction\n step.actionObject = {\n action: createCallbackAction(step.action, context),\n methodName: 'execute',\n };\n } else if (isString(step.action)) {\n // 如果是字符串\n step.actionObject = parseAction(step.action, context, step.arg);\n } else if (isArray(step.action)) {\n // 如果是数组\n const actionArr = step.action;\n const argArr = isArray(step.arg) ? step.arg : [step.arg];\n step.actionObject = [];\n each(actionArr, (actionStr, idx) => {\n (step.actionObject as ActionObject[]).push(parseAction(actionStr, context, argArr[idx]));\n });\n }\n // 如果 action 既不是字符串，也不是函数，则不会生成 actionObject\n });\n });\n }\n\n // 是否允许指定阶段名称执行\n private isAllowStep(stepName: string): boolean {\n const currentStepName = this.currentStepName;\n const steps = this.steps;\n // 相同的阶段允许同时执行\n if (currentStepName === stepName) {\n return true;\n }\n\n if (stepName === STEP_NAMES.SHOW_ENABLE) {\n // 示能在整个过程中都可用\n return true;\n }\n\n if (stepName === STEP_NAMES.PROCESSING) {\n // 只有当前是 start 时，才允许 processing\n return currentStepName === STEP_NAMES.START;\n }\n\n if (stepName === STEP_NAMES.START) {\n // 如果当前是 processing，则无法 start，必须等待 end 后才能执行\n return currentStepName !== STEP_NAMES.PROCESSING;\n }\n\n if (stepName === STEP_NAMES.END) {\n return currentStepName === STEP_NAMES.PROCESSING || currentStepName === STEP_NAMES.START;\n }\n\n if (stepName === STEP_NAMES.ROLLBACK) {\n if (steps[STEP_NAMES.END]) {\n // 如果定义了 end, 只有 end 时才允许回滚\n return currentStepName === STEP_NAMES.END;\n } else if (currentStepName === STEP_NAMES.START) {\n // 如果未定义 end, 则判断是否是开始\n return true;\n }\n }\n return false;\n }\n\n // 具体的指定阶段是否允许执行\n private isAllowExecute(stepName: string, step: InteractionStep): boolean {\n if (this.isAllowStep(stepName)) {\n const key = this.getKey(stepName, step);\n // 如果是在本环节内仅允许触发一次，同时已经触发过，则不允许再触发\n if (step.once && this.emitCaches[key]) {\n return false;\n }\n // 如果是允许的阶段，则验证 isEnable 方法\n if (step.isEnable) {\n return step.isEnable(this.context);\n }\n return true; // 如果没有 isEnable 则允许执行\n }\n return false;\n }\n\n private enterStep(stepName: string) {\n this.currentStepName = stepName;\n this.emitCaches = {}; // 清除所有本环节触发的缓存\n }\n\n // 执行完某个触发和反馈（子环节）\n private afterExecute(stepName: string, step) {\n // show enable 不计入正常的流程，其他情况则设置当前的 step\n if (stepName !== STEP_NAMES.SHOW_ENABLE && this.currentStepName !== stepName) {\n this.enterStep(stepName);\n }\n const key = this.getKey(stepName, step);\n // 一旦执行，则缓存标记为，一直保持到跳出改环节\n this.emitCaches[key] = true;\n }\n // 获取某个环节的唯一的键值\n private getKey(stepName, step) {\n return stepName + step.trigger + step.action;\n }\n\n // 获取 step 的回调函数，如果已经生成，则直接返回，如果未生成，则创建\n private getActionCallback(stepName: string, step: InteractionStep): (e: object) => void {\n const context = this.context;\n const callbackCaches = this.callbackCaches;\n const actionObject = step.actionObject;\n if (step.action && actionObject) {\n const key = this.getKey(stepName, step);\n if (!callbackCaches[key]) {\n // 动态生成执行的方法，执行对应 action 的名称\n const actionCallback = (event) => {\n context.event = event; // 保证检测时的 event\n if (this.isAllowExecute(stepName, step)) {\n // 如果是数组时，则依次执行\n if (isArray(actionObject)) {\n each(actionObject, (obj: ActionObject) => {\n context.event = event; // 可能触发新的事件，保证执行前的 context.event 是正确的\n executeAction(obj);\n });\n } else {\n context.event = event; // 保证执行前的 context.event 是正确的\n executeAction(actionObject);\n }\n this.afterExecute(stepName, step);\n if (step.callback) {\n context.event = event; // 保证执行前的 context.event 是正确的\n step.callback(context);\n }\n } else {\n // 如果未通过验证，则事件不要绑定在上面\n context.event = null;\n }\n };\n // 如果设置了 debounce\n if (step.debounce) {\n callbackCaches[key] = debounce(actionCallback, step.debounce.wait, step.debounce.immediate);\n } else if (step.throttle) {\n // 设置 throttle\n callbackCaches[key] = throttle(actionCallback, step.throttle.wait, {\n leading: step.throttle.leading,\n trailing: step.throttle.trailing,\n });\n } else {\n // 直接设置\n callbackCaches[key] = actionCallback;\n }\n }\n return callbackCaches[key];\n }\n return null;\n }\n\n private bindEvent(eventName, callback) {\n const nameArr = eventName.split(':');\n if (nameArr[0] === 'window') {\n window.addEventListener(nameArr[1], callback);\n } else if (nameArr[0] === 'document') {\n document.addEventListener(nameArr[1], callback);\n } else {\n this.view.on(eventName, callback);\n }\n }\n\n private offEvent(eventName, callback) {\n const nameArr = eventName.split(':');\n if (nameArr[0] === 'window') {\n window.removeEventListener(nameArr[1], callback);\n } else if (nameArr[0] === 'document') {\n document.removeEventListener(nameArr[1], callback);\n } else {\n this.view.off(eventName, callback);\n }\n }\n}\n"]} |