// ==UserScript==
// @name Hide objects until double click (Flash block)
// @author TarquinWJ
// @namespace http://www.howtocreate.co.uk/
// @version 2.1
// @description  Hides all embedded objects until you double click on
//          the page.
// @ujs:category general: enhancements
// @ujs:published 2005-10-29 20:00
// @ujs:modified 2005-10-29 23:01
// @ujs:documentation http://userjs.org/scripts/general/enhancements/hide-objects
// @ujs:download http://userjs.org/scripts/download/general/enhancements/hide-objects.js
// ==/UserScript==


/*
 * Please see
 * http://www.howtocreate.co.uk/operaStuff/userJavaScript.html#terms
 * for License and Terms of Use
 */

(function () {

//specify elements to hide
var typesToHide = ['object','embed','applet'];

//timeout to hide notification (in milliseconds) - 0 for no notification
var hideNoticeIn = 5000;

//should it show a placeholder for each hidden element - can be clicked to re-show
var showPlaceholder = true;

//should it show the address of the blocked object when you hold your mouse over the placeholders
var showTooltip = true;

// ***stop editing***

var hiddenAlready = [], hasDoneOneReshow, hasHiddenSomething = 0, hasAllowedSomething = [], foo, fooInt, oProtectNum = -1, oProtectType = /^(image\/|text\/|application\/.*xml$)/;

for( var i = 0; typesToHide[i]; i++ ) {
    //dynamic objects - Opera will keep these updated
    if( typesToHide[i] == 'object' ) { oProtectNum = i; }
    typesToHide[i] = document.getElementsByTagName(typesToHide[i]);
    hiddenAlready[i] = 0;
    hasAllowedSomething[i] = 0;
}

function titleCas(oWord) {
    return oWord.charAt(0).toUpperCase()+oWord.substr(1).toLowerCase();
}

function checkForMoreHide() {
    //check if any more have been added since we last checked
    for( var x = 0, y; y = typesToHide[x]; x++ ) {
        for( var z = hiddenAlready[x] + hasAllowedSomething[x], oEl, oAt; oEl = y[z]; z++ ) {
            //do not hide objects if they are being viewed on their own
            if( !z && ( document.body.firstChild == document.body.lastChild ) && ( oEl == document.body.firstChild ) ) { return; }
            if( ( x == oProtectNum ) && ( oAt = oEl.getAttribute('type') ) && oAt.match(oProtectType) ) {
                //allow certain data types of objects
                hasAllowedSomething[x]++;
                continue;
            }
            if( showPlaceholder ) {
                //make a clickable placeholder
                var oPH = document.createElement('hidobplhld');
                oPH.appendChild(document.createTextNode(titleCas(oEl.tagName)+' schovan. Kliknete zde pro zobrazeni.'));
                oPH.onclick = function () {
                    //show this, and if it is an object, show child embeds as well
                    if( this.actobj.tagName.toLowerCase() == 'object' ) {
                        //objects fall back. so do other elements, but objects are special imho, so fallback children will be shown
                        for( var n = 0, m = ['embed','object'], l; l = m[n]; n++ ) {
                            for( var i = 0, j = this.actobj.getElementsByTagName(l), k; k = j[i]; i++ ) {
                                if( k.style.wasDsspMod ) { k.style.noticelm.onclick(); }
                            }
                        }
                    }
                    this.actobj.style.display = this.actobj.style.olddisplay;
                    this.actobj.style.wasDsspMod = false;
                    if(showTooltip) { document.body.removeChild(this.fauxtitle); }
                    this.parentNode.removeChild(this);
                };
                //try to find appropriate size - offsetFoo reports 0 if falling back or if parent is set to display:none;
                var oTmpSty = oEl.getAttribute('height');
                oTmpSty = 'height:' + ( ( oTmpSty ? parseInt( oTmpSty ) : ( oEl.offsetHeight ? oEl.offsetHeight : 50 ) ) - 2 ) + 'px;';
                var oTmpSty2 = oEl.getAttribute('width');
                oTmpSty2 = 'width:' + ( ( oTmpSty2 ? parseInt( oTmpSty2 ) : ( oEl.offsetWidth ? oEl.offsetWidth : 150 ) ) - 2 ) + 'px;';
                oPH.setAttribute('style','display:inline-block;cursor:crosshair;overflow:hidden;border:1px solid #000;background-color:#ddd;color:#000;'+oTmpSty+oTmpSty2);
                if( showTooltip ) {
                    //try to get the address of the blocked item
                    var oTitle = oEl.getAttribute('src') ? oEl.getAttribute('src') : ( oEl.getAttribute('data') ? oEl.getAttribute('data') : oEl.getAttribute('movie') );
                    if( !oTitle && oEl.tagName.toLowerCase() == 'object' ) {
                        for( var i = 0, j; j = oEl.childNodes[i]; i++ ) {
                            if( !j.tagName || j.tagName.toLowerCase() != 'param' ) { continue; }
                            var pName = j.getAttribute('name').toLowerCase();
                            if( ( pName == 'data' ) || ( pName == 'movie' ) || ( pName == 'src' ) ) {
                                oTitle = j.getAttribute('value');
                                if( oTitle ) { break; }
                            }
                        }
                    }
                    if( !oTitle && ( oEl.codebase || oEl.code ) ) {
                        oTitle = ( oEl.codebase ? oEl.codebase : '' ) + ( oEl.code ? oEl.code : '' );
                    }
                    if( oTitle ) {
                        if( oTitle.length > 70 ) {
                            oTitle = oTitle.substr(0,45) + ' ... ' + oTitle.substr(oTitle.length - 25);
                        }
                        //title attribute ignored on custom elements, so using DHTML
                        oPH.fauxtitle = document.createElement('hidobplhldtoolt');
                        oPH.fauxtitle.setAttribute('style','position: absolute;top: 0px;left: 0px;visibility: hidden;border: 1px solid #000;font-size: smaller;color: #000;background-color: #ffffe1;padding: 1px;white-space: nowrap;');
                        oPH.fauxtitle.appendChild(document.createTextNode(oTitle));
                        oPH.addEventListener('mousemove',function (e) {
                            var tY = e.pageY + 22, tX = e.pageX + 10;
                            if( tX + this.fauxtitle.offsetWidth + 20 > window.innerWidth + window.pageXOffset ) { tX = window.innerWidth + window.pageXOffset - ( this.fauxtitle.offsetWidth + 20 ); }
                            if( tY + this.fauxtitle.offsetHeight + 20 > window.innerHeight + window.pageYOffset ) { tY = e.pageY - ( this.fauxtitle.offsetHeight + 20 ); }
                            this.fauxtitle.style.top = tY + 'px';
                            this.fauxtitle.style.left = tX + 'px';
                            if( !this.isO ) {
                                this.fauxtitle.style.visibility = 'visible';
                                this.isO = true;
                            }
                        },false);
                        oPH.addEventListener('mouseout',function () {
                            this.fauxtitle.style.visibility = 'hidden';
                            this.fauxtitle.style.top = '0px';
                            this.fauxtitle.style.left = '0px';
                            this.isO = false;
                        },false);
                        document.body.appendChild(oPH.fauxtitle);
                    }
                }
                oEl.parentNode.insertBefore(oPH,oEl);
                //preserve pointers between elements so that download-embeds script does not conflict
                oPH.actobj = oEl;
                oEl.style.noticelm = oPH;
            }
            //hide the element
            oEl.style.wasDsspMod = true;
            oEl.style.olddisplay = oEl.style.display ? oEl.style.display : '';
            oEl.style.display = 'none';
            hasHiddenSomething++;
        }
        hiddenAlready[x] = z;
    }
}
var oIntR = setInterval(checkForMoreHide,200);

document.addEventListener('load',function () {
    clearInterval(oIntR); //stop checking
    checkForMoreHide(); //one last time
    if( !hasHiddenSomething ) { return; }
    document.documentElement.addEventListener('dblclick',function () {
        //add a double click listener to make all elements reappear
        if( hasDoneOneReshow ) { return; }
        hasDoneOneReshow = true;
        for( var x = 0, y; y = typesToHide[x]; x++ ) {
            for( var z = 0, oEl; z < hiddenAlready[x] && ( oEl = y[z]) ; z++ ) {
                if( oEl.style.wasDsspMod ) {
                    oEl.style.display = oEl.style.olddisplay;
                    if( showPlaceholder ) { if(showTooltip) { document.body.removeChild(oEl.style.noticelm.fauxtitle); } oEl.parentNode.removeChild(oEl.style.noticelm); }
                }
            }
        }
    },false);
    if( hideNoticeIn ) {
        //show a notice if required
        foo = document.createElement('sayaboutembeds');
        foo.appendChild(document.createTextNode((hasHiddenSomething--)+' element'+(hasHiddenSomething?'u':'')+' zablokovano. Udelejte dvojklik na stranku pro zobrazeni.'));
        foo.setAttribute('style','position:absolute;top:0px;right:0px;padding:2px;border:2px dotted red;background-color:#fff;color:red;cursor:crosshair;');
        foo.onclick = function () { clearTimeout(fooInt); this.parentNode.removeChild(this); };
        document.body.appendChild(foo);
        fooInt = setTimeout(function () { foo.parentNode.removeChild(foo); },hideNoticeIn);
    }
},false);

})();