Put on your mouse cursor on the image to preview
// ==UserScript==
// @name Danbooru Previewer
// @namespace http://tampermonkey.net/
// @version 1.0
// @description Put on your mouse cursor on the image to preview
// @author rung-rung
// @match http://danbooru.donmai.us/*
// @grant none
// @lacal en
// ==/UserScript==
(function() {
//画像サイズの倍率 1で100%
var IMAGE_SIZE = 1;
//プレビュー画像の不透明度 1にすると全く透過せず、0に近づくほど透明になる
var OPACITY = 0.9;
//プレビューを表示する待機時間 単位はミリ秒
var WAIT_TIME = 1000;
function openPreview() {
var rect = thumb.getBoundingClientRect();
var screenHeight = document.documentElement.clientHeight;
if (rect.height < rect.width) {
img.style.height = 'auto';
img.style.width = `${screenHeight * IMAGE_SIZE}px`;
} else {
img.style.width = 'auto';
img.style.height = `${screenHeight * IMAGE_SIZE}px`;
}
var parent = thumb.parentNode.parentNode;
img.setAttribute('src', parent.getAttribute('data-large-file-url'));
previewWindow.style.display = 'block';
}
var previewWindow = document.createElement("div");
previewWindow.setAttribute('id', 'preview-window');
var img = document.createElement('img');
previewWindow.appendChild(img);
document.body.appendChild(previewWindow);
//スタイルシートをまとめて動的に設定するhttp://d.hatena.ne.jp/acid-panda/20110307/1299517528
var css = (function() {
var s = document.createElement('style');
s.setAttribute("type", "text/css");
document.getElementsByTagName('head').item(0).appendChild(s);
var ss = s.sheet;
return function(sel, sty) {
ss.insertRule(sel + "{" + sty + "}", 0);
};
})();
css('#preview-window', `
display: none;
position: fixed;
z-index: 99;
pointer-events: none;
top: 0px;
left: 0px;
`);
css('#preview-window img', `
opacity: ${OPACITY};
pointer-events: none;
`);
var timeOutID;
var thumb;
function addPreviewEventToThumbnail() {
thumbnail = document.evaluate('//article//img[not(contains(@preview, "true"))]', document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
for (var i = 0; i < thumbnail.snapshotLength; i++) {
thumbnail.snapshotItem(i).onmouseover = function() {thumb = this;
timeOutID = setTimeout(function() {openPreview();}, WAIT_TIME);
};
thumbnail.snapshotItem(i).onmouseout = function() {clearTimeout(timeOutID);
previewWindow.style.display = 'none';
};
thumbnail.snapshotItem(i).setAttribute('preview', 'true');
}
}
addPreviewEventToThumbnail();
//Autopagerizeに対応
window.onmousemove = (function () {
addPreviewEventToThumbnail();
});
})();