墨水屏电纸书优化

针对墨水屏的优化适合电纸书省电看漫画 ①可消除移动动画(松手才移动页面) ②可设置双击放大复原 ③可屏蔽长按图片弹出的菜单
换行
// ==UserScript==
// @name         墨水屏电纸书优化
// @namespace    cc.cxuan.books
// @version      1.32
// @description  针对墨水屏的优化 适合电纸书省电 看漫画 ①可消除移动动画(松手才移动页面) ②可设置双击放大复原 ③可屏蔽长按图片弹出的菜单
// @match        *://*/*
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @run-at       document-end
// @noframes
// @license      MIT
// @author       cxuan.cc
// ==/UserScript==
(function(){
    // 设置项
    let my = GM_getValue('multiplierY', 2.5);
    let mx = 2;
    let intervalSec = GM_getValue('interval', 0.3);
    let doubleClickZoom = GM_getValue('doubleClickZoom', 2);
    let enableMx = GM_getValue('enableMx', false);
    let enableParent = GM_getValue('enableParent', false);
    let blockContextMenu = GM_getValue('blockContextMenu', false);

    function updateSettings({key, value}) {
        // 更新本地变量
        switch (key) {
            case 'multiplierY': my = value; break;
            case 'interval':
                intervalSec = value;
                stopTimer(); startTimer();
                break;
            case 'doubleClickZoom': doubleClickZoom = value; applyViewport(); break;
            case 'enableMx': enableMx = value; break;
            case 'enableParent': enableParent = value; break;
            case 'blockContextMenu': blockContextMenu = value; applyContextMenuBlock(); break;
        }
        if(key === 'doubleClickZoom') applyViewport();
    }

    GM_registerMenuCommand(`设置Y轴移动倍率（之前 ${my}）`, ()=>{
        let v = parseFloat(prompt('Y 轴滑动倍率:', my));
        if (!isNaN(v)) {
            GM_setValue('multiplierY', v);
            updateSettings({key:'multiplierY', value:v});
        }
    });
    GM_registerMenuCommand(`设置更新间隔（之前 ${intervalSec}s）`, ()=>{
        let v = parseFloat(prompt('更新间隔（秒，0=仅松手时刷新）:', intervalSec));
        if (!isNaN(v)) {
            GM_setValue('interval', v);
            updateSettings({key:'interval', value:v});
        }
    });
    GM_registerMenuCommand(`设置双击放大倍率（之前 ${doubleClickZoom}）`, ()=>{
        let v = parseFloat(prompt('双击放大倍率（0=无双击放大）:', doubleClickZoom));
        if (!isNaN(v)) {
            GM_setValue('doubleClickZoom', v);
            updateSettings({key:'doubleClickZoom', value:v});
        }
    });
    GM_registerMenuCommand(`切换x轴移动优化开关 固定${mx}倍（之前 ${enableMx ? '开' : '关'}）`, ()=>{
        let v = !enableMx;
        GM_setValue('enableMx', v);
        updateSettings({key:'enableMx', value:v});
    });
    GM_registerMenuCommand(`切换父元素一同滚动（之前 ${enableParent ? '开' : '关'}）`, ()=>{
        let v = !enableParent;
        GM_setValue('enableParent', v);
        updateSettings({key:'enableParent', value:v});
    });
    GM_registerMenuCommand(`切换右键菜单屏蔽（之前 ${blockContextMenu ? '开' : '关'}）`, ()=>{
        let v = !blockContextMenu;
        GM_setValue('blockContextMenu', v);
        updateSettings({key:'blockContextMenu', value:v});
    });

    //开启或禁止双指缩放
    let meta = document.querySelector('meta[name=viewport]');
    const vp = 'width=device-width, initial-scale=1, minimum-scale=0.25, maximum-scale=10, user-scalable=yes';

    const applyViewport = ()=>{
        let head = document.head || document.getElementsByTagName('head')[0] || document.documentElement;
        if(doubleClickZoom > 0){
            if (meta) {
                meta.setAttribute('content', vp);
            } else {
                meta = document.createElement('meta');
                meta.name = 'viewport';
                meta.content = vp;
                document.head.appendChild(meta);
            }
        }else{
            if (meta) {
                meta.setAttribute('content', vp);
            }
        }
        head.prepend(meta);
    };
    applyViewport();

    // 右键菜单屏蔽函数
    let contextMenuHandler = function(e) {
        if (!e.target.closest('a')) e.preventDefault();
    };
    function applyContextMenuBlock() {
        document.removeEventListener('contextmenu', contextMenuHandler, true);
        if (blockContextMenu) {
            document.addEventListener('contextmenu', contextMenuHandler, true);
        }
    }
    applyContextMenuBlock();

    const initialZoom = parseFloat(document.body.style.zoom) || 1;
    const touchMap = {}; // id -> { sx, sy, cx, cy, el, lastDx, lastDy }
    let timerId = null;

    function periodicUpdate() {
        for (let id in touchMap) {
            const info = touchMap[id];
            if (info.cx == null || info.cy == null) continue;
            let totalDx = (info.sx - info.cx) * mx;
            let totalDy = (info.sy - info.cy) * my;
            let dX = totalDx - (info.lastDx || 0);
            let dY = totalDy - (info.lastDy || 0);
            if (enableParent) {
                let node = info.el;
                while (node) {
                    if (dX) node.scrollLeft += dX;
                    if (dY) node.scrollTop += dY;
                    node = node.parentNode;
                }
            } else {
                if (dX) info.el.scrollLeft += dX;
                if (dY) info.el.scrollTop += dY;
            }
            info.lastDx = totalDx;
            info.lastDy = totalDy;
        }
    }
    function startTimer(){
        if (intervalSec > 0 && !timerId) {
            timerId = setInterval(periodicUpdate, intervalSec * 1000);
        }
    }
    function stopTimer(){
        if (timerId) {
            clearInterval(timerId);
            timerId = null;
        }
    }

    document.addEventListener('touchstart', e=>{
        if (e.touches.length > 1) return;
        for (const t of e.changedTouches) {
            let el = t.target;
            while (el && el !== document) {
                const style = getComputedStyle(el);
                const canScrollY = el.scrollHeight > el.clientHeight && /auto|scroll/.test(style.overflowY);
                const canScrollX = el.scrollWidth > el.clientWidth && /auto|scroll/.test(style.overflowX);
                if (canScrollY || canScrollX) break;
                el = el.parentNode;
            }
            if (!el || el === document) {
                el = document.scrollingElement || document.documentElement;
            }
            touchMap[t.identifier] = {
                sx: t.clientX, sy: t.clientY,
                cx: t.clientX, cy: t.clientY,
                el,
                lastDx: 0, lastDy: 0
            };
        }
        startTimer();
    }, { passive:false });

    document.addEventListener('touchmove', e=>{
        if (e.touches.length > 1) return;
        let doPrevent = false;
        for (const t of e.changedTouches) {
            const info = touchMap[t.identifier];
            if (!info) continue;
            info.cx = t.clientX;
            info.cy = t.clientY;
            // 允许顶部下拉刷新
            if (!(info.el === (document.scrollingElement || document.documentElement)
                  && info.el.scrollTop === 0
                  && (t.clientY - info.sy) > 0)) {
                doPrevent = true;
            }
            // 主要横向移动
            if(!enableMx){
                if (Math.abs(info.cx - info.sx) > Math.abs(info.cy - info.sy) * 2){
                    doPrevent = false;
                }
            }
        }
        if (doPrevent) e.preventDefault();
    }, { passive:false });

    function finishTouch(e) {
        if (e.touches.length > 1) return;
        for (const t of e.changedTouches) {
            const info = touchMap[t.identifier];
            if (!info) continue;
            if (intervalSec === 0) {
                let dx = (info.sx - t.clientX) * mx;
                let dy = (info.sy - t.clientY) * my;
                info.el.scrollLeft += dx;
                info.el.scrollTop += dy;
            } else {
                info.cx = t.clientX;
                info.cy = t.clientY;
                periodicUpdate();
            }
            delete touchMap[t.identifier];
        }
        if (Object.keys(touchMap).length === 0) stopTimer();
    }
    document.addEventListener('touchend', finishTouch, { passive:false });
    document.addEventListener('touchcancel', finishTouch, { passive:false });

    // 用 viewport 实现双击复位
    let lastTap = 0;
    let isDoubleClickZoomBig = false;
    document.addEventListener('touchend', e=>{
        if (doubleClickZoom == 0) return;
        // 仅单指
        if (e.touches.length === 0 && e.changedTouches.length === 1) {
            let now = Date.now();
            if (now - lastTap < 300) {
                // 修改或插入 viewport
                let meta = document.querySelector('meta[name=viewport]');
                isDoubleClickZoomBig = !isDoubleClickZoomBig;
                const vp = `width=device-width, initial-scale=${isDoubleClickZoomBig ? doubleClickZoom : 1}, maximum-scale=10`;
                if (meta) {
                    meta.setAttribute('content', vp);
                } else {
                    meta = document.createElement('meta');
                    meta.name = 'viewport';
                    meta.content = vp;
                    document.head.appendChild(meta);
                }
            }
            lastTap = now;
        }
    }, { passive:true });

})();
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