Auto-Resize on Chrome Picture Preview Tab
// ==UserScript==
// @name Picture Auto-Resize on Chrome
// @name:zh-cn 图片在Chrome中自动缩放
// @namespace https://greasyfork.org/users/2646
// @version 0.8
// @description Auto-Resize on Chrome Picture Preview Tab
// @description:zh-cn 让大图在Chrome窗体内自动调整到适合的缩放大小，一览图片全貌（不会影响图片保存）
// @author 2016+, CLE
// @include *://*
// @grant none
// ==/UserScript==
if( ! document.contentType.match(/^image\//i) ) return;
var img = document.getElementsByTagName("img")[0];
var imginfo = document.createElement("div");
imginfo.setAttribute("style", "position:fixed; right:10px; top:5px; z-index:10086; color:#FFF; font-size: 26px; opacity:0.5; text-shadow: 0px 0px 5px #000; padding: 1px; text-align: right;");
document.body.appendChild(imginfo);
var imgfsize = -1; var tfs = "unknow";
function refinfo(){
var infohtml;
if(navigator.language=="zh-CN"){
infohtml = '图片宽：'+ img.width + ' / ' + img.naturalWidth +
'<br/>图片高：' + img.height + ' / ' + img.naturalHeight;
infohtml += '<br/>文件类型：' + document.contentType;
if(imgfsize > 0) infohtml += '<br/>文件大小：' + tfs;
}else{
infohtml = 'Width: '+ img.width + ' / ' + img.naturalWidth +
'<br/>Height: ' + img.height + ' / ' + img.naturalHeight;
infohtml += '<br/>File Type: ' + document.contentType;
if(imgfsize > 0) infohtml += '<br/>File Size: ' + tfs;
}
imginfo.innerHTML = infohtml;
}
var xhr = new XMLHttpRequest();
xhr.open("HEAD", document.location.href, true);
xhr.onreadystatechange = function(){
if ( xhr.readyState == 4 ) {
if ( xhr.status == 200 ) {
imgfsize = Number( xhr.getResponseHeader("Content-Length") );
if(imgfsize > 0){
if(imgfsize < 1024)
tfs = imgfsize + " bytes";
else if( imgfsize <=1024000 )
tfs = (imgfsize/1024).toFixed(2) + " KB";
else if( imgfsize >1024000 )
tfs = (imgfsize/1024/1024).toFixed(2) + " MB";
refinfo();
}
}
}
};
xhr.send();
function defsize(){
img.height = img.naturalHeight;
img.width = img.naturalWidth;
refinfo();
}
function autoresize() {
if ( img.naturalHeight > window.innerHeight || img.naturalWidth > window.innerWidth ) {
var hb = 0; var zb = 0; var rat = 0;
if(img.naturalWidth > window.innerWidth) hb = img.naturalWidth / window.innerWidth;
if(img.naturalHeight > window.innerHeight) zb = img.naturalHeight / window.innerHeight;
if(hb !== 0 && zb !== 0){
if(hb >= zb) rat = hb; else rat = zb;
} else if (hb !==0) {
rat = hb;
} else if (zb !==0) {
rat = zb;
}
if (rat !==0 ){
img.width = img.naturalWidth / rat;
img.height = img.naturalHeight / rat;
}
}
refinfo();
}
autoresize();
window.onresize = autoresize;
var defm = false;
window.onkeydown = function(event){
switch(event.keyCode) {
case 13: //enter
if(defm){
window.onresize = autoresize;
autoresize();
}else{
window.onresize = null;
defsize();
}
defm = !defm;
break;
case 27: //escape
window.close();
break;
case 16: //shift
if(imginfo.style.display=="none")
imginfo.style.display = "block";
else
imginfo.style.display = "none";
break;
}
};