Centers images (directly opened with browser)(firefox-like) with hotkeys (to resize or scroll)
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// ==UserScript==
// @name Center Image
// @namespace CenterImage
// @author Owyn
// @version 1.94
// @description Centers images (directly opened with browser)(firefox-like) with hotkeys (to resize or scroll)
// @supportURL https://github.com/Owyn/Center_Image/issues
// @homepage https://github.com/Owyn/Center_Image
// @run-at document-end
// @noframes
// @grant GM.getValue
// @grant GM.setValue
// @grant GM_registerMenuCommand
// @match http://*/*
// @match https://*/*
// @match file:///*/*
// ==/UserScript==
"use strict";
var images = document.images;
if (!images || images.length !== 1 || images[0].src !== location.href)
{
return false;
}
if (typeof GM_registerMenuCommand !== "undefined")
{
GM_registerMenuCommand("Center Image Configuration", cfg, "n");
}
var rescaled = false;
var iot = 0, iol = 0;
var i = images[0];
function makeimage()
{
if(typeof cfg_js !== "string") {setTimeout(function() { makeimage(); }, 11); return false;} // lets wait for async
if(cfg_bgclr)
{
document.body.bgColor = cfg_bgclr;
if(document.head){document.head.innerHTML = "";} // remove FireFox background
}
document.body.innerHTML = "<style>img { position: absolute; top: 0; right: 0; bottom: 0; left: 0; }</style>"; // center image
i.style = ""; // chrome has lots of crap there
document.body.style = "";
i.style.margin = "auto"; // center image
document.body.style.margin = "0px";
document.body.appendChild(i);
i.addEventListener("mousedown", onmousedown, true);
i.addEventListener("click", rescale, true);
window.addEventListener("keydown", onkeydown, true);
window.addEventListener("resize", onresize, true);
onVisibilityChange();
}
function onVisibilityChange()
{
if (document.visibilityState === 'visible')
{
if(i)
{
autoresize();
document.removeEventListener('visibilitychange', onVisibilityChange);
}
}
}
document.addEventListener("visibilitychange", onVisibilityChange);
function onresize()
{
if(rescaled)
{
rescaled = false;
rescale();
}
}
function changecursor()
{
i.style.margin = "auto";
if(!rescaled && (((i.naturalHeight / window.devicePixelRatio).toFixed() == window.innerHeight && (i.naturalWidth / window.devicePixelRatio).toFixed() <= window.innerWidth) || ((i.naturalHeight / window.devicePixelRatio).toFixed() <= window.innerHeight && (i.naturalWidth / window.devicePixelRatio).toFixed() == window.innerWidth))) // one img dimension is equal to screen and other is the same or less than the screen
{
i.style.cursor = "";
}
else if((i.naturalHeight / window.devicePixelRatio).toFixed() > window.innerHeight || (i.naturalWidth / window.devicePixelRatio).toFixed() > window.innerWidth) // at least one img dimenion is bigger than the screen
{
if(rescaled)
{
i.style.cursor = "zoom-in";
i.style.cursor = "-webkit-zoom-in";
}
else
{
i.style.cursor = "zoom-out";
i.style.cursor = "-webkit-zoom-out";
if((i.naturalHeight / window.devicePixelRatio).toFixed() > window.innerHeight) // image pushing out-of-screen fix
{
i.style.margin = "0px auto";
}
}
}
else
{
if(rescaled)
{
i.style.cursor = "zoom-out";
i.style.cursor = "-webkit-zoom-out";
}
else
{
i.style.cursor = "zoom-in";
i.style.cursor = "-webkit-zoom-in";
}
}
}
function onmousedown()
{
if(i.offsetLeft > 0){iol = i.offsetLeft;}
if(i.offsetTop > 0){iot = i.offsetTop;}
}
function rescale(event)
{
if(rescaled)
{
rescaled = false;
var scale, ex, ey;
if(event)
{
if (typeof event.y === "undefined") // Firefox
{
ex = event.clientX;
ey = event.clientY;
}
else
{
ex = event.x;
ey = event.y;
}
ex -= iol;
ey -= iot;
scale = Math.min((window.innerWidth / (i.naturalWidth / window.devicePixelRatio).toFixed()), (window.innerHeight / (i.naturalHeight / window.devicePixelRatio).toFixed()));
}
i.removeAttribute("width");
i.removeAttribute("height");
i.style.width = (i.naturalWidth / window.devicePixelRatio).toFixed() + "px";
i.style.height = (i.naturalHeight / window.devicePixelRatio).toFixed() + "px";
changecursor();
if(event)
{
window.scrollTo(ex / scale - window.innerWidth / 2, ey / scale - window.innerHeight / 2);
}
}
else
{
i.removeAttribute("width");
i.removeAttribute("height");
i.style.width = (i.naturalWidth / window.devicePixelRatio).toFixed() + "px";
i.style.height = (i.naturalHeight / window.devicePixelRatio).toFixed() + "px";
if((i.naturalWidth / window.devicePixelRatio).toFixed() != window.innerWidth)
{
i.style.width = window.innerWidth + "px";
i.style.height = "";
rescaled = true;
}
if((i.height > window.innerHeight) || (i.width > window.innerWidth))
{
i.style.width = (i.naturalWidth / window.devicePixelRatio).toFixed() + "px";
i.style.height = (i.naturalHeight / window.devicePixelRatio).toFixed() + "px";
if((i.naturalHeight / window.devicePixelRatio).toFixed() != window.innerHeight)
{
i.style.height = window.innerHeight + "px";
i.style.width = "";
rescaled = true;
}
}
changecursor();
}
}
function autoresize()
{
if(!document.head) // old fix for old chrome - let it be
{
document.lastChild.insertBefore(document.createElement("head"), document.body);
}
var link = document.createElement('link');
link.type = 'image/x-icon';
link.rel = 'shortcut icon';
link.href = i.src;
document.head.appendChild(link); // favicon
var title = i.src.substr(i.src.lastIndexOf("/")+1);
if(title.indexOf("?") != -1)
{
title = title.substr(0, title.indexOf("?"));
}
document.title = title + " (" + i.naturalWidth + "x" + i.naturalHeight + ")"; // title
rescaled = true;rescale(0); // to original size in pixels
if(cfg_fitWH && i.height > window.innerHeight && i.width > window.innerWidth) // both scrollbars
{
rescale(0);
}
else if(cfg_fitB && (i.height > window.innerHeight || i.width > window.innerWidth)) // one scrollbar
{
rescale(0);
}
else if(cfg_fitS && i.height <= window.innerHeight && i.width <= window.innerWidth) // no scrollbars
{
rescale(0);
}
if(cfg_js){eval(cfg_js);}
}
// hotkeys
if (typeof KeyEvent === "undefined")
{
var KeyEvent = {
DOM_VK_SPACE: 32,
DOM_VK_LEFT: 37,
DOM_VK_UP: 38,
DOM_VK_RIGHT: 39,
DOM_VK_DOWN: 40,
DOM_VK_A: 65,
DOM_VK_D: 68,
DOM_VK_P: 80,
DOM_VK_Q: 81,
DOM_VK_S: 83,
DOM_VK_W: 87,
DOM_VK_NUMPAD2: 98,
DOM_VK_NUMPAD4: 100,
DOM_VK_NUMPAD5: 101,
DOM_VK_NUMPAD6: 102,
DOM_VK_NUMPAD8: 104
};
}
function cancelEvent(a)
{
a = a ? a : window.event;
if (a.stopPropagation)
{
a.stopPropagation();
}
if (a.preventDefault)
{
a.preventDefault();
}
a.cancelBubble = true;
a.cancel = true;
a.returnValue = false;
return false;
}
function scroll_space(a, b)
{
var by = Math.round((b ? window.innerHeight : window.innerWidth) * 0.50 * (a ? -1 : 1));
if(!b)
{
window.scrollBy(0, by);
}
else
{
window.scrollBy(by, 0);
}
}
function onkeydown (b)
{
var a = (window.event) ? b.keyCode : b.which;
if (a != KeyEvent.DOM_VK_SPACE && (b.altKey || b.ctrlKey || b.metaKey))
{
return;
}
var by = Math.round(window.innerHeight * 0.10);
switch (a)
{
case KeyEvent.DOM_VK_RIGHT:
case KeyEvent.DOM_VK_D:
case KeyEvent.DOM_VK_NUMPAD6:
window.scrollBy(by, 0);
cancelEvent(b);
break;
case KeyEvent.DOM_VK_LEFT:
case KeyEvent.DOM_VK_A:
case KeyEvent.DOM_VK_NUMPAD4:
window.scrollBy(by * -1, 0);
cancelEvent(b);
break;
case KeyEvent.DOM_VK_W:
case KeyEvent.DOM_VK_NUMPAD8:
window.scrollBy(0, by * -1);
cancelEvent(b);
break;
case KeyEvent.DOM_VK_S:
case KeyEvent.DOM_VK_NUMPAD2:
window.scrollBy(0, by);
cancelEvent(b);
break;
case KeyEvent.DOM_VK_SPACE:
scroll_space(b.shiftKey, b.ctrlKey);
cancelEvent(b);
break;
case KeyEvent.DOM_VK_Q:
case KeyEvent.DOM_VK_NUMPAD5:
rescale(0);
cancelEvent(b);
break;
case KeyEvent.DOM_VK_P:
cfg();
cancelEvent(b);
}
}
var cfg_bgclr = "grey";
var cfg_fitWH = true;
var cfg_fitB = false;
var cfg_fitS = true;
var cfg_js;
function cfg(){}
if (typeof GM !== "undefined" && typeof GM.getValue !== "undefined")
{
async function loadCfg()
{
cfg_bgclr = await GM.getValue("bgColor", "grey");
cfg_fitWH = await GM.getValue("fitWH", true);
cfg_fitB = await GM.getValue("fitB", false);
cfg_fitS = await GM.getValue("fitS", true);
cfg_js = await GM.getValue("js", "");
makeimage();
}
loadCfg();
function $(id) {return document.getElementById(id);}
cfg = function ()
{
function saveCfg()
{
GM.setValue("bgColor", $("ci_cfg_2_bgclr").value);
GM.setValue("fitWH", $("ci_cfg_3_fitWH").checked);
GM.setValue("fitB", $("ci_cfg_4_fitB").checked);
GM.setValue("fitS", $("ci_cfg_5_fitS").checked);
GM.setValue("js", $("ci_cfg_6_js").value);
alert("Configuration Saved");
if($("ci_cfg_2_bgclr").value){document.body.bgColor = $("ci_cfg_2_bgclr").value;}else{document.body.removeAttribute("bgColor");}
}
if(i){i.removeEventListener("click", rescale, true);}
window.removeEventListener("keydown", onkeydown, true);
if(document.head){document.head.innerHTML = "";}
document.body.innerHTML = "";
var div = document.createElement("div");
div.style.margin = "11% auto";
div.style.width = "444px";
div.style.border = "solid 1px black";
div.style.background = "silver";
div.innerHTML = "<b><center>Configuration</center></b>"
+ "<br><input id='ci_cfg_2_bgclr' type='text' size='6'> Background color (empty = default)"
+ "<br><br>Fit to window images:"
+ "<br><br><input id='ci_cfg_3_fitWH' type='checkbox'> Larger than window both vertically and horizontally"
+ "<br><br><input id='ci_cfg_4_fitB' type='checkbox'> Larger than window either vertically or horizontally"
+ "<br><br><input id='ci_cfg_5_fitS' type='checkbox'> Smaller than window"
+ "<br><br><center>Custom JS Action:<textarea id='ci_cfg_6_js' style='margin: 0px; width: 400px; height: 50px;'></textarea>"
+ "<br><input id='ci_cfg_save' type='button' value='Save configuration'></center>";
document.body.appendChild(div);
$("ci_cfg_2_bgclr").value = cfg_bgclr;
$("ci_cfg_3_fitWH").checked = cfg_fitWH;
$("ci_cfg_4_fitB").checked = cfg_fitB;
$("ci_cfg_5_fitS").checked = cfg_fitS;
$("ci_cfg_6_js").value = cfg_js;
$("ci_cfg_save").addEventListener("click", saveCfg, true);
}
}
else
{
cfg_js = "";
cfg = function ()
{
alert("Sorry, Chrome userscripts in native mode can't have configurations! You need to install TamperMonkey userscript manager extension. (it's very good)");
}
}