265 lines
10 KiB
JavaScript
265 lines
10 KiB
JavaScript
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class cy_slider {
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constructor(ele, options = undefined) {
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var that = this
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this.options = options
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//slider 盒子，顶层元素
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this.slider_box = ele
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if (this.slider_box == null) {
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return
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}
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//slider 手柄
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this.handler = this.slider_box.querySelector('.handler')
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//slider 有值块
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this.light = this.slider_box.querySelector('.light')
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//是否是垂直
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if (this.slider_box.classList.contains("vertical")) {
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this.is_vertical = true
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}
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//是否是禁用
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if (this.slider_box.attributes.getNamedItem("disabled") && this.slider_box.attributes.getNamedItem("disabled").value.toLowerCase() != "false") {
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this.is_disabled = true
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}
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this.is_initialize = true
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this.max_data = 100
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this.min_data = 0
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this.step_separates = []
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this.step_percents = []
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if (options) {
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//参数校验，必要内置参数预算
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var u_max_data = parseFloat(options.max_data)
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if (u_max_data || u_max_data == 0) {
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this.max_data = u_max_data
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}
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var u_min_data = parseFloat(options.min_data)
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if (u_min_data || u_min_data == 0) {
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if (u_min_data < this.max_data) {
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this.min_data = u_min_data
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} else {
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this.min_data = this.max_data
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}
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}
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//步长分割
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var data_area = this.max_data - this.min_data
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var u_step = Math.abs(parseFloat(options.step))
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if (u_step) {
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if (data_area / u_step > 200) {
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u_step = data_area / 200
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}
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} else {
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u_step = Math.floor(data_area / 100)
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}
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var added_step = this.min_data
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this.step_separates.push(added_step)
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while (added_step < this.max_data) {
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added_step += parseFloat(u_step)
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added_step = parseFloat(added_step.toFixed(3))
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if (added_step > this.max_data) {
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added_step = this.max_data
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}
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this.step_separates.push(added_step)
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}
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for (var i = 0; i < this.step_separates.length; i++) {
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if (this.step_separates.length == 1) {
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this.step_percents.push(1)
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break
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}
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var step_percent = i / (this.step_separates.length - 1)
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this.step_percents.push(step_percent)
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}
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}
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this.slider_box.addEventListener('click', (ev) => {
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//点击设置值
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if (that.is_disabled) {
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return
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}
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if (ev.target.nodeName != "SPAN") {
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if (that.is_vertical) {
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if (ev.target.classList.contains("light")) {
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that._setPosition(that.slider_box.offsetHeight - (that.slider_box.offsetHeight - that.light.offsetHeight + ev.offsetY))
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}
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else {
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that._setPosition(that.slider_box.offsetHeight - ev.offsetY)
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}
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} else {
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that._setPosition(ev.offsetX)
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}
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}
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})
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this.movementX = 0
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this.movementY = 0
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this.previousTouch = null
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this.crt_val = 0
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this.slider_box.addEventListener('mousedown', (ev) => {
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//标准端拖动开始
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if (that.is_disabled) {
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return
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}
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that.movementX = 0
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that.movementY = 0
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that.previousTouch = null
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if (that.is_vertical) {
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that.crt_val = that.slider_box.offsetHeight * (that.handler.style.bottom.replace("%", "") / 100)
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} else {
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that.crt_val = that.slider_box.offsetWidth * (that.handler.style.left.replace("%", "") / 100)
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}
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document.documentElement.addEventListener('mousemove', _dragMove)
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document.documentElement.addEventListener('mouseup', () => {
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document.documentElement.removeEventListener('mousemove', _dragMove)
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})
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})
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this.slider_box.addEventListener('touchstart', (ev) => {
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//touch端拖动开始
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if (that.is_disabled) {
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return
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}
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that.movementX = 0
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that.movementY = 0
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that.previousTouch = null
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if (that.is_vertical) {
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that.crt_val = that.slider_box.offsetHeight * (that.handler.style.bottom.replace("%", "") / 100)
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} else {
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that.crt_val = that.slider_box.offsetWidth * (that.handler.style.left.replace("%", "") / 100)
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}
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document.documentElement.addEventListener('touchmove', _dragMove)
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document.documentElement.addEventListener('touchend', () => {
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document.documentElement.removeEventListener('touchmove', _dragMove)
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})
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})
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function _dragMove(ev) {
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if (ev.type == "touchmove") {
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//touch端
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if (that.previousTouch) {
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that.movementX += ev.touches[0].pageX - that.previousTouch.pageX;
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that.movementY += ev.touches[0].pageY - that.previousTouch.pageY;
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};
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that.previousTouch = ev.touches[0];
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if (that.is_vertical) {
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var new_val = that.crt_val - that.movementY
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if (new_val < 0) {
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new_val = 0
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} else if (new_val > that.slider_box.offsetHeight) {
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new_val = that.slider_box.offsetHeight
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}
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that._setPosition(new_val)
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} else {
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var new_val = that.crt_val + that.movementX
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if (new_val < 0) {
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new_val = 0
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} else if (new_val > that.slider_box.offsetWidth) {
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new_val = that.slider_box.offsetWidth
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}
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that._setPosition(new_val)
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}
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} else {
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//标准端
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that.movementX += ev.movementX
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that.movementY += ev.movementY
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if (that.is_vertical) {
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var new_val = that.crt_val - that.movementY
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if (new_val < 0) {
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new_val = 0
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} else if (new_val > that.slider_box.offsetHeight) {
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new_val = that.slider_box.offsetHeight
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}
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that._setPosition(new_val)
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} else {
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var new_val = that.crt_val + that.movementX
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if (new_val < 0) {
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new_val = 0
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} else if (new_val > that.slider_box.offsetWidth) {
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new_val = that.slider_box.offsetWidth
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}
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that._setPosition(new_val)
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}
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}
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ev.preventDefault()
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}
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//根据相关值设置 slider 样式
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this._setPosition = function (val, noCallback) {
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var percent
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if (this.is_vertical) {
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percent = parseFloat(val) / this.slider_box.offsetHeight
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} else {
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percent = parseFloat(val) / this.slider_box.offsetWidth
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}
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var resultData
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var closest_index = Math.floor(this.step_separates.length * percent)
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if (closest_index >= this.step_separates.length) {
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closest_index = this.step_separates.length - 1
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}
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resultData = this.step_separates[closest_index]
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percent = this.step_percents[closest_index]
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var percentCss = percent * 100 + '%'
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if (this.is_vertical) {
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this.light.style.height = percentCss
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this.handler.style.bottom = percentCss
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} else {
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this.light.style.width = percentCss
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this.handler.style.left = percentCss
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}
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this.slider_box.dataset.value = resultData
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if (!this.is_initialize) {
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if (this.options) {
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if (this.options.callback instanceof Function && !noCallback) {
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this.options.callback(resultData)
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}
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}
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}
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}
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//设置初始默认值
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if (this.options) {
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var default_data = parseFloat(this.options.default_data)
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if (default_data || default_data == 0) {
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this.setSliderData(default_data)
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} else {
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this.setSliderData(this.min_data)
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}
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this.is_initialize = false
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}
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}
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//用户公开的方法，设置 slider 值
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setSliderData(data, noCallback = false) {
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if (data < this.min_data) {
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data = this.min_data
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}
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if (data > this.max_data) {
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data = this.max_data
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}
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var percent
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var min_differ = Number.MAX_VALUE
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for (var i = 0; i < this.step_separates.length; i++) {
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var crt_differ = Math.abs(data - this.step_separates[i])
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if (crt_differ < min_differ) {
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min_differ = crt_differ
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percent = this.step_percents[i]
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}
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if (crt_differ == 0) {
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break
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}
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}
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var move_val
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if (this.is_vertical) {
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move_val = parseFloat(this.slider_box.offsetHeight * percent)
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} else {
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move_val = parseFloat(this.slider_box.offsetWidth * percent)
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}
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this._setPosition(move_val, noCallback)
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}
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//用户公开的方法，设置是否禁用
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setDisabled(is_disabled) {
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this.is_disabled = is_disabled
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if (!this.slider_box || !this.slider_box.attributes) {
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return
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}
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if (is_disabled) {
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var attr_disabled = document.createAttribute("disabled")
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this.slider_box.attributes.setNamedItem(attr_disabled)
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} else {
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this.slider_box.attributes.removeNamedItem("disabled")
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}
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}
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}
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export default cy_slider
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