Colorpicker

基于element-ui的主题颜色修改器

<template>
    <el-color-picker v-model="theme" class="theme-picker" 
        popper-class="theme-picker-dropdown">
    </el-color-picker>
</template>

<script>
    const version = require("element-ui/package.json").version; // 版本号
    const ORIGINAL_THEME = "#409EFF";

    export default {
        name: "colorPicker",
        data() {
            return {
                chalk: "",
                theme: "#409EFF",
            };
        },
        mounted() {
            // if (this.CheckIsColor(localStorage.getItem("colorPicker"))) {
            //  // this.theme = localStorage.getItem("colorPicker");
            // }
        },
        watch: {
            theme(val, oldVal) {
                this.$message.success("换肤成功");
                if (typeof val !== "string") return;
                localStorage.setItem("colorPicker", val);
                const themeCluster = this.getThemeCluster(val.replace("#", ""));
                const originalCluster = this.getThemeCluster(oldVal.replace("#", ""));
                const getHandler = (variable, id) => {
                    return () => {
                        const originalCluster = this.getThemeCluster(
                            ORIGINAL_THEME.replace("#", "")
                        );
                        const newStyle = this.updateStyle(
                            this[variable],
                            originalCluster,
                            themeCluster
                        );

                        let styleTag = document.getElementById(id);
                        if (!styleTag) {
                            styleTag = document.createElement("style");
                            styleTag.setAttribute("id", id);
                            document.head.appendChild(styleTag);
                        }
                        styleTag.innerText = newStyle;
                    };
                };

                const chalkHandler = getHandler("chalk", "chalk-style");

                if (!this.chalk) {
                    const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`;
                    this.getCSSString(url, chalkHandler, "chalk");
                } else {
                    chalkHandler();
                }

                const styles = [].slice
                    .call(document.querySelectorAll("style"))
                    .filter(style => {
                        const text = style.innerText;
                        return (
                            new RegExp(oldVal, "i").test(text) && !/Chalk Variables/.test(text)
                        );
                    });
                styles.forEach(style => {
                    const {
                        innerText
                    } = style;
                    if (typeof innerText !== "string") return;
                    style.innerText = this.updateStyle(
                        innerText,
                        originalCluster,
                        themeCluster
                    );
                });
                /* 当颜色改变时，使用vuex储存改变的颜色值 */
                
            }
        },

        methods: {
            CheckIsColor(bgVal) {
                var type = "^#[0-9a-fA-F]{6}$";
                var re = new RegExp(type);
                if (bgVal.match(re) == null) {
                    type =
                        // eslint-disable-next-line no-useless-escape
                        "^[rR][gG][Bb][\(]([\\s]*(2[0-4][0-9]|25[0-5]|[01]?[0-9][0-9]?)[\\s]*,){2}[\\s]*(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)[\\s]*[\)]{1}$";
                    re = new RegExp(type);
                    if (bgVal.match(re) == null) {
                        return false;
                    } else {
                        return true;
                    }
                } else {
                    return true;
                }
            },
            updateStyle(style, oldCluster, newCluster) {
                let newStyle = style;
                oldCluster.forEach((color, index) => {
                    newStyle = newStyle.replace(new RegExp(color, "ig"), newCluster[index]);
                });
                return newStyle;
            },

            getCSSString(url, callback, variable) {
                const xhr = new XMLHttpRequest();
                xhr.onreadystatechange = () => {
                    if (xhr.readyState === 4 && xhr.status === 200) {
                        this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, "");
                        callback();
                    }
                };
                xhr.open("GET", url);
                xhr.send();
            },

            getThemeCluster(theme) {
                const tintColor = (color, tint) => {
                    let red = parseInt(color.slice(0, 2), 16);
                    let green = parseInt(color.slice(2, 4), 16);
                    let blue = parseInt(color.slice(4, 6), 16);

                    if (tint === 0) {
                        // when primary color is in its rgb space
                        return [red, green, blue].join(",");
                    } else {
                        red += Math.round(tint * (255 - red));
                        green += Math.round(tint * (255 - green));
                        blue += Math.round(tint * (255 - blue));

                        red = red.toString(16);
                        green = green.toString(16);
                        blue = blue.toString(16);

                        return `#${red}${green}${blue}`;
                    }
                };

                const shadeColor = (color, shade) => {
                    let red = parseInt(color.slice(0, 2), 16);
                    let green = parseInt(color.slice(2, 4), 16);
                    let blue = parseInt(color.slice(4, 6), 16);

                    red = Math.round((1 - shade) * red);
                    green = Math.round((1 - shade) * green);
                    blue = Math.round((1 - shade) * blue);

                    red = red.toString(16);
                    green = green.toString(16);
                    blue = blue.toString(16);

                    return `#${red}${green}${blue}`;
                };

                const clusters = [theme];
                for (let i = 0; i <= 9; i++) {
                    clusters.push(tintColor(theme, Number((i / 10).toFixed(2))));
                }
                clusters.push(shadeColor(theme, 0.1));
                return clusters;
            }
        }
    };
</script>

<style>
    .theme-picker .el-color-picker__trigger {
        vertical-align: middle;
    }

    .theme-picker-dropdown .el-color-dropdown__link-btn {
        display: none;
    }
</style>