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/*
* ==VimperatorPlugin==
* @name highlight.js
* @description Factory for the object to highlight specified element[s]. this set in plugins.highlighterFactory.
* @description-ja 指定した要素をハイライトするオブジェクトを返す Factory 。 plugins.highlighterFactory に構築される。
* @author janus_wel <janus_wel@fb3.so-net.ne.jp>
* @version 0.12
* @minversion 2.3pre 2009/11/02
* ==/VimperatorPlugin==
*
* LICENSE
* New BSD License
*
* USAGE
* plugins.highlighterFactory() return the object to highlight element[s].
* arguments is object that have below properties.
* color: color name that define by css or RGB format ( #xxxxxx ),
* opacity: opacity for -moz-opacity property in css.
* interval: interval to blink ( unit: msec ). if 0 specified, not blink.
*
* returned object has 3 methods.
* set: setter that accept object have above properties.
* highlight: method to highlight specified element.
* unhighlightAll: unhighlight all.
*
* highlight is implement by "div" element that have style "position: absolute;".
* it has class name "vimp_plugin_highlightelement", so you should use buffer.evaluateXPath
* with query that like '//div[contains(concat(" ", @class, " "), " vimp_plugin_highlightelement ")]'
* when you want to process elements to highlight.
*
* EXAMPLE
* let h = plugins.highlighterFactory({
* color: '#0080ff',
* opacity: 0.7,
* interval: 0,
* );
* h.highlight(content.document.getElementsByTagName('A'));
* h.unhighlightAll();
*
* TODO
* need valid English.
* */
( function () {
const fixedStyle = [
'position: absolute;',
'display: block;',
'z-index: 2147483647;',
].join('');
// class definition
function Highlighter() {
this._initialize.apply(this, arguments);
}
Highlighter.prototype = {
_initialize: function (args) {
if (args) this.set(args);
this.highlightList = [];
},
set: function (args) {
this.color = args.color;
this.opacity = args.opacity;
this.interval = args.interval;
this._prepareTemplate();
return this;
},
_prepareTemplate: function () {
let div = window.document.createElement('div');
div.className = 'vimp_plugin_highlightelement';
let style = fixedStyle + [
'background-color: ' + this.color + ';',
'-moz-opacity: ' + this.opacity + ';'
].join('');
div.setAttribute('style', style);
this._highlightTemplate = div;
},
highlight: function (element) {
if (!this._isDisplay(element)) return;
let doc = element.ownerDocument;
// TODO: highlight XUL elements
if (!doc.body) return;
let scrollX = doc.defaultView.scrollX;
let scrollY = doc.defaultView.scrollY;
let rects = element.getClientRects();
for (let i=0, l=rects.length ; i<l ; ++i) {
let r = rects[i];
let h = this._buildHighlighter({
top: r.top + scrollY,
left: r.left + scrollX,
width: r.right - r.left,
height: r.bottom - r.top,
});
this.highlightList.push(h);
doc.body.appendChild(h);
}
},
_unhighlight: function (element) {
if (element.intervalId) clearInterval(element.intervalId);
element.parentNode.removeChild(element);
},
unhighlightAll: function () {
let list = this.highlightList;
while (list.length) this._unhighlight(list.pop());
},
_isDisplay: function (element) {
let computedStyle = content.document.defaultView.getComputedStyle(element, null);
return ( computedStyle.getPropertyValue('visibility') !== 'hidden'
&& computedStyle.getPropertyValue('display') !== 'none');
},
_buildHighlighter: function (rect) {
let div = this._highlightTemplate.cloneNode(false);
div.style.top = rect.top + 'px';
div.style.left = rect.left + 'px';
div.style.width = rect.width + 'px';
div.style.height = rect.height + 'px';
if (this.interval > 0) {
div.intervalId = setInterval(
function () {
let d = div.style.display;
div.style.display = (d === 'block' ? 'none' : 'block');
},
this.interval
);
}
else {
div.intervalId = undefined;
}
return div;
},
};
if (!plugins.highlighterFactory) {
plugins.highlighterFactory = function () {
let h = new Highlighter();
return h.set.apply(h, arguments);
}
}
} )();
// vim: set sw=4 ts=4 et;
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