doodle-mini/miniprogram/pages/index/index.ts

import { WATER_COLORS, PAPER_SIZE } from '../../constants/index';
import TextDrawService from '../../service/textDrawService';

Page({
    canvas: null as Canvas | null,
    ctx: null as RenderingContext | null,
    boxHeight: 0,
    boxWidth: 0,
    textDrawService: null as TextDrawService | null,

    data: {
        cardList: [] as Array<{ color: string; word: string }>,
        showColorPopup: false,
        currentKey: 0,
        currentColor: '',
        showIntroductionPopup: false,
    },

    onLoad() {
        const hasShowIntroduction =
            wx.getStorageSync('hasShowIntroduction') || false;

        if (!hasShowIntroduction) {
            this.setData({
                cardList: [
                    { color: '#FF0000', word: '涂' },
                    { color: '#00FF00', word: '欢' },
                    { color: '#FF7F00', word: '鸦' },
                    { color: '#00FFFF', word: '迎' },
                    { color: '#FFFF00', word: '丫' },
                    { color: '#8A2BE2', word: '你' },
                ],
                showIntroductionPopup: true,
            });
        }
    },

    onReady() {
        const query = wx.createSelectorQuery();
        query
            .select('#canvasWrapper')
            .boundingClientRect((rect) => {
                if (rect) {
                    const { width, height } = PAPER_SIZE['A4'];
                    const boxWidth = rect.width;
                    const boxHeight = boxWidth / (width / height);

                    this.boxHeight = boxHeight;
                    this.boxWidth = boxWidth;
                    this.initCanvas(boxWidth, boxHeight);
                }
            })
            .exec();
    },

    initCanvas(boxWidth: number, boxHeight: number) {
        wx.createSelectorQuery()
            .select('#canvasContent')
            .fields({
                node: true,
                size: true,
            })
            .exec((res) => {
                if (res[0] && res[0].node) {
                    const canvas = res[0].node;
                    const ctx = canvas.getContext('2d');
                    if (ctx) {
                        this.canvas = canvas;
                        this.ctx = ctx;
                        // const rect = res[0];
                        this.textDrawService = new TextDrawService(canvas, ctx);
                        // textDrawService.draw();
                        this.setData({ boxWidth, boxHeight });
                    }
                }
            });
    },

    /** 变更cardList 并更新canvas */
    drawCanvas(
        updatedCardList: Array<{ color: string; word: string }>,
        callback: () => void = () => {},
    ) {
        this.setData({ cardList: updatedCardList }, callback);
        this.textDrawService?.draw(updatedCardList);
    },

    tapCard(e: WechatMiniprogram.TouchEvent) {
        const { url } = e.currentTarget.dataset;
        wx.navigateTo({ url });
    },

    onConfirmInput(e: WechatMiniprogram.Input) {
        const { value } = e.detail;
        const characters = value.split('');
        const shuffledColors = [...WATER_COLORS.extended24].sort(
            () => Math.random() - 0.5,
        );
        const updatedCardList = characters.map((char, index) => ({
            color: shuffledColors[index % shuffledColors.length].hex,
            word: char,
        }));
        this.drawCanvas(updatedCardList);
    },

    deleteWordCard(e: WechatMiniprogram.CustomEvent) {
        const { key, word } = e.detail;
        const { cardList } = this.data;
        const updatedCardList = cardList.filter((_, index) => index !== key);

        this.drawCanvas(updatedCardList, () => {
            wx.showToast({
                title: `已删除 "${word}"`,
                icon: 'none',
                duration: 2000,
            });
        });
    },

    /** 下载打印 */
    exportToPrint() {
        console.log('this.canvas:', this.canvas);
        if (this.canvas && this.data.cardList.length > 0) {
            wx.canvasToTempFilePath({
                canvas: this.canvas,
                fileType: 'png',
                quality: 1,
                success: (res) => {
                    wx.getImageInfo({
                        src: res.tempFilePath,
                        success: (res) =>
                            console.log(
                                'getImageInfo image size :',
                                res.width,
                                res.height,
                            ), // 应输出2480x3508
                    });
                    wx.saveImageToPhotosAlbum({
                        filePath: res.tempFilePath,
                        success: () => wx.showToast({ title: '保存成功' }),
                    });
                },
            });
            return;
        }
    },

    onColorTap(e: WechatMiniprogram.CustomEvent) {
        const { key, word, color } = e.detail;
        this.setData({
            showColorPopup: true,
            currentKey: key,
            currentColor: color,
        });
    },

    onCloseColorPopup() {
        this.setData({
            showColorPopup: false,
            currentKey: 0,
            currentColor: '',
        });
    },

    onChangeColor(e: WechatMiniprogram.CustomEvent) {
        const { color } = e.detail;
        const { currentKey, cardList } = this.data;
        cardList[currentKey].color = color;
        this.setData({
            showColorPopup: false,
            cardList,
        });
    },

    onCloseIntroductionPopup() {
        this.setData({ showIntroductionPopup: false });
        wx.setStorageSync('hasShowIntroduction', true);
    },
});