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Allows the image opened in the new tab to zoom independently without affecting the original page
// ==UserScript==
// @name New Tab Image Zoom
// @name:zh-CN 新标签页图片缩放
// @namespace https://greasyfork.org/zh-CN/users/193133-pana
// @homepage https://greasyfork.org/zh-CN/users/193133-pana
// @version 1.0.1
// @description Allows the image opened in the new tab to zoom independently without affecting the original page
// @description:zh-CN 允许在新标签页中打开的图片独立缩放，而不影响原网页
// @author pana
// @license GNU General Public License v3.0 or later
// @match *://*/*
// @compatible chrome
// @compatible firefox
// @grant GM_addStyle
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_registerMenuCommand
// @noframes
// ==/UserScript==
(function () {
'use strict';
class Picture {
constructor(imgObj, shortcuts = false) {
this.imgObj = imgObj;
this.imgSrc = imgObj.src;
this.shortcuts = shortcuts;
this.wrapper = null;
this.tip = null;
this.ratio = 1;
this.width = 0;
this.height = 0;
this.naturalWidth = 0;
this.naturalHeight = 0;
this.innerWidth = window.innerWidth;
this.innerHeight = window.innerHeight;
this.init();
}
sleep(ms, callback) {
setTimeout(() => {
console.info(ms / 1000 + ' second later.');
if (typeof callback === 'function') {
callback();
}
}, ms);
}
resetImgUrl(maxErrorNum) {
if (maxErrorNum > 0) {
this.imgObj.onerror = () => {
console.warn('Image load error: ' + this.imgSrc + '\nReset count: ' + (12 - maxErrorNum));
this.resetImgUrl(maxErrorNum - 1);
};
this.sleep(500, () => {
this.imgObj.src = this.imgSrc;
});
} else {
this.imgObj.onerror = null;
}
}
tips() {
const tip = document.createElement('div');
tip.className = 'new-tab-image-zoom-tips';
tip.title = 'Left-Click: Restore the original size(100%).\nRight-Click: Adapt to window size.';
tip.addEventListener('click', event => {
event.stopPropagation();
this.restore();
});
tip.addEventListener('contextmenu', event => {
event.preventDefault();
this.adapt();
});
this.tip = tip;
this.setTips();
this.observer();
}
setTips() {
if (this.tip) {
this.tip.textContent = Math.round(this.ratio * 100) + '%';
}
}
observer() {
const ob = new ResizeObserver(() => {
this.handler();
});
ob.observe(this.imgObj);
}
wrap() {
this.tips();
const wrapDiv = document.createElement('div');
wrapDiv.className = 'new-tab-image-zoom-wrapper';
document.body.insertBefore(wrapDiv, this.imgObj);
document.body.removeChild(this.imgObj);
wrapDiv.appendChild(this.imgObj);
this.tip && wrapDiv.appendChild(this.tip);
wrapDiv.addEventListener('wheel', event => {
if (event.ctrlKey) {
event.preventDefault();
if (event.wheelDelta > 0) {
this.zoomIn(0.1);
} else if (event.wheelDelta < 0) {
this.zoomOut(0.1);
}
return false;
}
});
this.wrapper = wrapDiv;
}
handler() {
this.width = this.imgObj.width || 0;
this.height = this.imgObj.height || 0;
this.naturalWidth = this.imgObj.naturalWidth || 0;
this.naturalHeight = this.imgObj.naturalHeight || 0;
if (this.width > 0 && this.height > 0 && this.naturalWidth > 0 && this.naturalHeight > 0) {
this.ratio = this.width / this.naturalWidth || this.height / this.naturalHeight;
this.setTips();
}
}
init() {
this.wrap();
this.imgObj.classList.add('new-tab-image-zoom-image');
if (this.imgObj.complete) {
this.handler();
} else {
this.imgObj.onload = () => {
this.handler();
};
this.imgObj.onerror = () => {
console.warn('Image load error: ' + this.src + '\nReset count: 1');
this.resetImgUrl(10);
};
}
if (this.shortcuts) {
document.onkeydown = e => {
const ev = e || window.event;
const eKeyCode = ev.keycode || ev.which || ev.charCode;
const eCtrl = ev.ctrlKey || ev.metaKey;
const eAlt = ev.altKey;
if (eKeyCode === 187 && eCtrl) {
e.preventDefault();
this.zoomIn();
return false;
}
if (eKeyCode === 189 && eCtrl) {
e.preventDefault();
this.zoomOut();
return false;
}
if (eKeyCode === 48 && eCtrl && eAlt) {
e.preventDefault();
this.restore();
return false;
}
if (eKeyCode === 48 && eCtrl) {
e.preventDefault();
this.adapt();
return false;
}
};
}
}
zoom() {
this.imgObj.width = this.naturalWidth * this.ratio;
this.imgObj.height = this.naturalHeight * this.ratio;
}
zoomIn(ratio = 0.1) {
this.ratio += ratio;
this.zoom();
}
zoomOut(ratio = 0.1) {
if (this.ratio > ratio) {
this.ratio -= ratio;
this.zoom();
}
}
restore() {
this.ratio = 1;
this.zoom();
}
adapt() {
this.innerWidth = window.innerWidth;
this.innerHeight = window.innerHeight;
if (this.naturalWidth / this.naturalHeight >= this.innerWidth / this.innerHeight) {
this.ratio = this.innerWidth / this.naturalWidth;
} else {
this.ratio = this.innerHeight / this.naturalHeight;
}
this.zoom();
}
}
if (document.body.children.length === 1 && document.body.children[0].nodeName === 'IMG') {
const zoomStyle = `
.new-tab-image-zoom-wrapper {
display: flex;
background-color: #0e0e0e;
width: 100%;
height: 100%;
justify-content: center;
align-items: center;
}
.new-tab-image-zoom-image {
margin: auto;
}
.new-tab-image-zoom-tips {
position: fixed;
z-index: 99;
top: 1vh;
right: 1vw;
padding: 3px 6px;
text-align: center;
color: #eeeeee;
font-size: 14px;
line-height: 1;
background-color: #666666;
border: 1px solid #333333;
box-shadow: 1px 1px 2px #030303;
border-radius: 5px;
box-sizing: border-box;
overflow: hidden;
user-select: none;
cursor: pointer;
}
.new-tab-image-zoom-tips:hover {
color: #449a46;
background-color: #f0f9eb;
border: 1px solid #d6e9c6;
}
`;
GM_addStyle(zoomStyle);
const { shortcuts } = GM_getValue('newTabConfig', { shortcuts: false });
const _picture = new Picture(document.body.children[0], shortcuts);
GM_registerMenuCommand(`Keyboard shortcuts [${shortcuts ? 'Enabled' : 'Disabled'}]`, () => {
GM_setValue('newTabConfig', {
shortcuts: !shortcuts,
});
location.reload();
});
}
})();