• 基于vue的颜色选择器vue-color-picker


    项目中有用到颜色选择器的童鞋们可以看过来了

    关于color-picker的jquery的插件是有蛮多,不过vue组件没有吧,反正我没有找到,

    虽然element-ui里面有这个,但是你愿意为了一个小功能去引入这么大的依赖库吗?

    适用于:想写基于vue的单个color-picker功能的童鞋

    甩github地址啦:https://github.com/alexzaolin/vue-color-picker

    (麻烦觉得有用的童鞋帮我点个star,谢谢谢谢谢~~)

    凑个字数贴一下代码(部分算法来自网络):

    <template lang="html">
    <div>
        <div class="color-picker-container" :id="containerId" :class="{'active':isShowPicker}">
            <div class="color"></div>
            <div class="wheel"></div>
            <div class="overlay"></div>
            <div class="h-marker marker"></div>
            <div class="sl-marker marker"></div>
        </div>
    </div>
    </template>
    
    <script>
    /**
     * author : alex 
     * email : 961163829@qq.com
     */
    export default {
        props:{
            /*由父组件传递的默认颜色*/
            defaultColor:{
                type:String,
                default:"#000000"
            },
            /*目标元素,可以是input框或者按钮等*/
            targetElem:null
        },
        data(){
            return {
                isShowPicker:false,
                wheel:document.querySelector('.wheel'),
                color:this.defaultColor,
                containerId:"color-picker-container",
                dom:{
                    hMarker:null,
                    slMarker:null,
                    color:null,
                    targetElem:null,
                    container:null
                },
                radius:84,
                square:100,
                194
            }
        },
        mounted(){
    
            this.dom.container=document.querySelector('#'+this.containerId);
            this.dom.hMarker=document.querySelector('.h-marker');
            this.dom.slMarker=document.querySelector('.sl-marker');
            this.dom.color=document.querySelector('.color');
            this.dom.targetElem=document.querySelector(this.targetElem);
    
    
            this.init();
        },
        methods:{
            init:function(){
                var self = this;
                self.posInit();
                self.eventBind();
    
                  // Init color
                self.setColor(self.color);
            },
            openPicker:function(){
                var self = this;
                this.isShowPicker = true;
                this.wheel=document.querySelector('.wheel');
                /*色盘打开的时候绑定点击事件*/
                document.addEventListener("click",self.documentClick);
            },
            closePicker:function(){
                this.isShowPicker = false;
                /*色盘关闭的时候解绑事件*/
                document.removeEventListener("click",this.documentClick);
            },
            eventBind:function(){
                var self = this;
                self.dom.container.addEventListener("mousedown",self.mousedown);
            },
            documentClick:function(e){
                /*你可能不需要关闭色盘,那这个方法也是可以不需要的*/
                var parents1 = this.getParents(e,this.dom.container,true);;
                var parents2 = this.getParents(e,this.dom.targetElem,true);
                if(parents1.length===0&&parents2.length===0){
                    this.closePicker();
                }
            },
            posInit:function(){
                /*色盘的位置计算*/
                var target = this.dom.targetElem;
    
                var top = this.getElementViewTop(target);
                var left = this.getElementViewLeft(target);
    
                this.dom.container.style.position = "fixed";
                this.dom.container.style.top = (top)+'px';
                
                this.dom.container.style.left = (left + this.dom.targetElem.offsetWidth)+'px';
                
            },
            getElementViewLeft:function(element){
                /*获取元素距离视窗左部距离*/
            var actualLeft = element.offsetLeft;
            var current = element.offsetParent;
    
            while (current !== null){
              actualLeft += current.offsetLeft;
              current = current.offsetParent;
            }
    
            if (document.compatMode == "BackCompat"){
              var elementScrollLeft=document.body.scrollLeft;
            } else {
              var elementScrollLeft=document.documentElement.scrollLeft; 
            }
    
            return actualLeft-elementScrollLeft;
          },
            getElementViewTop:function(element){
                /*获取元素距离视窗顶部距离*/
            var actualTop = element.offsetTop;
            var current = element.offsetParent;
    
            while (current !== null){
              actualTop += current. offsetTop;
              current = current.offsetParent;
            }
    
            if (document.compatMode == "BackCompat"){
              var elementScrollTop=document.body.scrollTop;
            } else {
              var elementScrollTop=document.documentElement.scrollTop; 
            }
    
            return actualTop-elementScrollTop;
          },
            getParents:function(e,parent,andSelf){
                /*获取祖先节点,返回一个数组*/
                var target = e.target;
                var parent = typeof parent==='string'?document.querySelector(parent):parent;
    
                var curTarget = target;
    
                var arr = typeof andSelf === "undefined"?[curTarget]:[];
                var result = [];
                
                while(true){
                    if((typeof parent !== 'undefined'&&curTarget == parent)||
                        typeof parent === 'undefined'&&curTarget.nodeType===9){
                        arr.push(curTarget);
                        break;
                    }
                    if(!!curTarget){arr.push(curTarget)}
    
                    if(!!curTarget.parentNode){
                        curTarget = curTarget.parentNode
                    }else{
                        break;
                    }
                }
                if(!!parent){
                    return arr.indexOf(parent)>-1?arr:[];
                }else{
                    return arr;
                }
            },
            getParent:function(e){
                /*获取父节点*/
                return e.target.nodeType!==9&&e.target.parentNode;
            },
            /**
             * 以下为组件内部函数
             * 算法来自网络
             */
            updateValue:function (event) {
                var self = this;
    
                var that = event.target;
                if (that.value && that.value != self.color) {
                    self.setColor(that.value);
                }
              },
            /**
            * Change color with HTML syntax #123456
            */
            setColor:function (color) {
                var self = this;
                var unpack = self.unpack(color);
                if (self.color != color && unpack) {
    
                    self.color = color;
                    self.rgb = unpack;
                    self.hsl = self.RGBToHSL(self.rgb);
                    self.updateDisplay();
                }
            },
            /**
            * Change color with HSL triplet [0..1, 0..1, 0..1]
            */
            setHSL:function (hsl) {
                var self = this;
                self.hsl = hsl;
                self.rgb = self.HSLToRGB(hsl);
                self.color = self.pack(self.rgb);
                self.updateDisplay();
            },
            /**
            * Retrieve the coordinates of the given event relative to the center
            * of the widget.
            */
              widgetCoords:function (event) {
                var self = this;
                var x, y;
                var el = event.target || event.srcElement;
                var reference = self.wheel;
                
                if (typeof event.offsetX != 'undefined') {
                  // Use offset coordinates and find common offsetParent
                  var pos = { x: event.offsetX, y: event.offsetY };
    
                  // Send the coordinates upwards through the offsetParent chain.
                  var e = el;
                  while (e) {
                    e.mouseX = pos.x;
                    e.mouseY = pos.y;
                    pos.x += e.offsetLeft;
                    pos.y += e.offsetTop;
                    e = e.offsetParent;
                  }
    
                  // Look for the coordinates starting from the wheel widget.
                  var e = reference;
                  var offset = { x: 0, y: 0 }
                  while (e) {
                    if (typeof e.mouseX != 'undefined') {
                      x = e.mouseX - offset.x;
                      y = e.mouseY - offset.y;
                      break;
                    }
                    offset.x += e.offsetLeft;
                    offset.y += e.offsetTop;
                    e = e.offsetParent;
                  }
    
                  // Reset stored coordinates
                  e = el;
                  while (e) {
                    e.mouseX = undefined;
                    e.mouseY = undefined;
                    e = e.offsetParent;
                  }
                }
                else {
                  // Use absolute coordinates
                  var pos = self.absolutePosition(reference);
                  x = (event.pageX || 0*(event.clientX + document.documentElement.scrollLeft)) - pos.x;
                  y = (event.pageY || 0*(event.clientY + document.documentElement.scrollTop)) - pos.y;
                }
                // Subtract distance to middle
                return { x: x - self.width / 2, y: y - self.width / 2 };
            },
            /**
            * Mousedown handler
            */
            mousedown:function (event) {
                var self = this;
                if (!document.dragging) {
                    document.documentElement.addEventListener('mousemove', self.mousemove);
                    document.documentElement.addEventListener('mouseup', self.mouseup);
                    document.dragging = true;
                }
    
                // Check which area is being dragged
                var pos = self.widgetCoords(event);
                self.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > self.square;
    
                // Process
                self.mousemove(event);
                return false;
            },
            /**
            * Mousemove handler
            */
            mousemove:function (event) {
                var self = this;
            // Get coordinates relative to color picker center
                var pos = self.widgetCoords(event);
    
                // Set new HSL parameters
                if (self.circleDrag) {
                var hue = Math.atan2(pos.x, -pos.y) / 6.28;
                if (hue < 0) hue += 1;
                    self.setHSL([hue, self.hsl[1], self.hsl[2]]);
                }
                else {
                    var sat = Math.max(0, Math.min(1, -(pos.x / self.square) + .5));
                    var lum = Math.max(0, Math.min(1, -(pos.y / self.square) + .5));
                    self.setHSL([self.hsl[0], sat, lum]);
                }
                return false;
            },
            /**
            * Mouseup handler
            */
            mouseup:function () {
                var self = this;
                // Uncapture mouse
                document.documentElement.removeEventListener('mousemove', self.mousemove);
                document.documentElement.removeEventListener('mouseup', self.mouseup);
                document.dragging = false;
            },
            /**
            * Update the markers and styles
            */
            updateDisplay:function () {
                var self = this;
                // Markers
                var angle = self.hsl[0] * 6.28;
                
                self.dom.hMarker.style.left = Math.round(Math.sin(angle) * self.radius + self.width / 2) + 'px';
                self.dom.hMarker.style.top = Math.round(-Math.cos(angle) * self.radius + self.width / 2) + 'px';
    
                self.dom.slMarker.style.left = Math.round(self.square * (.5 - self.hsl[1]) + self.width / 2) + 'px';
                self.dom.slMarker.style.top = Math.round(self.square * (.5 - self.hsl[2]) + self.width / 2) + 'px';
    
                // Saturation/Luminance gradient
                self.dom.color.style.backgroundColor = self.pack(self.HSLToRGB([self.hsl[0], 1, 0.5]));
    
    
                // important
                // 将获取到的最新的color值emit出去
                self.$emit("onChange",self.color);
                //self.dom.targetElem.style.backgroundColor = self.color;
                //self.dom.targetElem.style.color = self.hsl[2] > 0.5 ? '#000' : '#fff';
    
                // Change linked value
                // if (self.dom.targetElem.value && self.dom.targetElem.value != self.color) {
                //     self.dom.targetElem.value = self.color;
                // }
            },
            /**
            * Get absolute position of element
            */
            absolutePosition:function (el) {
                var self = this;
                var r = { x: el.offsetLeft, y: el.offsetTop };
                // Resolve relative to offsetParent
                if (el.offsetParent) {
                    var tmp = self.absolutePosition(el.offsetParent);
                    r.x += tmp.x;
                    r.y += tmp.y;
                }
                return r;
            },
            /* Various color utility functions */
            pack:function (rgb) {
                var r = Math.round(rgb[0] * 255);
                var g = Math.round(rgb[1] * 255);
                var b = Math.round(rgb[2] * 255);
                return '#' + (r < 16 ? '0' : '') + r.toString(16) +
                             (g < 16 ? '0' : '') + g.toString(16) +
                             (b < 16 ? '0' : '') + b.toString(16);
            },
            unpack:function (color) {
                if (color.length == 7) {
                    return [parseInt('0x' + color.substring(1, 3)) / 255,
                            parseInt('0x' + color.substring(3, 5)) / 255,
                            parseInt('0x' + color.substring(5, 7)) / 255];
                }
                else if (color.length == 4) {
                    return [parseInt('0x' + color.substring(1, 2)) / 15,
                            parseInt('0x' + color.substring(2, 3)) / 15,
                            parseInt('0x' + color.substring(3, 4)) / 15];
                }
            },
            HSLToRGB:function (hsl) {
                var m1, m2, r, g, b;
                var h = hsl[0], s = hsl[1], l = hsl[2];
                m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
                m1 = l * 2 - m2;
                return [this.hueToRGB(m1, m2, h+0.33333),
                        this.hueToRGB(m1, m2, h),
                        this.hueToRGB(m1, m2, h-0.33333)];
            },
            hueToRGB:function (m1, m2, h) {
                h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
                if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
                if (h * 2 < 1) return m2;
                if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
                return m1;
            },
            RGBToHSL:function (rgb) {
                var min, max, delta, h, s, l;
                var r = rgb[0], g = rgb[1], b = rgb[2];
                min = Math.min(r, Math.min(g, b));
                max = Math.max(r, Math.max(g, b));
                delta = max - min;
                l = (min + max) / 2;
                s = 0;
                if (l > 0 && l < 1) {
                    s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
                }
                h = 0;
                if (delta > 0) {
                    if (max == r && max != g) h += (g - b) / delta;
                    if (max == g && max != b) h += (2 + (b - r) / delta);
                    if (max == b && max != r) h += (4 + (r - g) / delta);
                    h /= 6;
                }
                return [h, s, l];
            }
        }
    }
    </script>
    
    <style lang="css" scoped>
    .color-picker-container {
        position: fixed;
        display: none;
      
    }
    .color-picker-container.active{
        display: block;
    }
    .color-picker-container * {
        position: absolute;
        cursor: crosshair;
    }
    .color-picker-container, .color-picker-container .wheel {
         195px;
        height: 195px;
    }
    .color-picker-container .color, .color-picker-container .overlay {
        top: 47px;
        left: 47px;
         101px;
        height: 101px;
    }
    .color-picker-container .wheel {
         195px;
        height: 195px;
        background: url(./images/wheel.png) no-repeat;
        -webkit-background-size: 100%;
        background-size: 100%;
    }
    .color-picker-container .overlay {
        background: url(./images/mask.png) no-repeat;
        -webkit-background-size: 100%;
        background-size: 100%;
    }
    .color-picker-container .marker {
         17px;
        height: 17px;
        margin: -8px 0 0 -8px;
        overflow: hidden;
        background: url(./images/marker.png) no-repeat;
        -webkit-background-size: 100%;
        background-size: 100%;
    }
    </style>
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  • 原文地址:https://www.cnblogs.com/AlexBlogs/p/7268989.html
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