User:Andrewds1021/JS/CategoryExhibitionAutoAdvance

//

/********************* this comment is 80 characters long *********************/

(function () {

"use strict";
if (window.andrewds1021 && window.andrewds1021.category_exhibition_auto_advance
    && window.andrewds1021.category_exhibition_auto_advance.has_run) return;
if (!window.andrewds1021) {
    window.andrewds1021 = {
        category_exhibition_auto_advance: {}
    };
} else if (!window.andrewds1021.category_exhibition_auto_advance) {
    window.andrewds1021.category_exhibition_auto_advance = {};
}
window.andrewds1021.category_exhibition_auto_advance.has_run = true;

var paginator = document.querySelector("#mw-pages > .category-gallery-paginator > .wikia-paginator > ul");
var forward_text = window.andrewds1021.category_exhibition_auto_advance.forward_text;
var forward_title = window.andrewds1021.category_exhibition_auto_advance.forward_title;
var backward_text = window.andrewds1021.category_exhibition_auto_advance.backward_text;
var backward_title = window.andrewds1021.category_exhibition_auto_advance.backward_title;
var halt_text = window.andrewds1021.category_exhibition_auto_advance.halt_text;
var halt_title = window.andrewds1021.category_exhibition_auto_advance.halt_title;
var interval = window.andrewds1021.category_exhibition_auto_advance.interval;
var enable = window.andrewds1021.category_exhibition_auto_advance.enable;
var init_pause = window.andrewds1021.category_exhibition_auto_advance.init_pause;
var buttons, timer;

if (!forward_text) forward_text = "\u25ba";
if (!forward_title) forward_title = "Scroll Forward";
if (!backward_text) backward_text = "\u25c4";
if (!backward_title) backward_title = "Scroll Backward";
if (!halt_text) halt_text = "\u25a0";
if (!halt_title) halt_title = "Stop Scrolling";
if (!interval || (typeof interval !== "number")) interval = 5000;
if (interval < 1000) interval = 1000;

if ((mw.config.get("wgNamespaceNumber") === 14) && paginator) {
    if (enable === "forward") {
        forward();
    } else if (enable === "backward") {
        backward();
    } else {
        halt();
    }
}

function forward() {
    disableButton("forward");
    removeTimer();
    if (!init_pause) goForward();
    timer = setInterval(goForward, interval);
}

function backward() {
    disableButton("backward");
    removeTimer();
    if (!init_pause) goBackward();
    timer = setInterval(goBackward, interval);
}

function halt() {
    disableButton("halt");
    removeTimer();
}

function disableButton(direction) {
    buttons = document.getElementById("andrewds1021-categoryexhibitionautoadvance-buttons");
    getPaginator();
    if (paginator && !buttons) {
        buttons = document.createElement("span");
        buttons.id = "andrewds1021-categoryexhibitionautoadvance-buttons";
        buttons.innerHTML = "<span id=\"andrewds1021-categoryexhibitionautoadvance-backward\" class=\"wikia-menu-button\" style=\"padding: 0 5px;\" title=\""+backward_title+"\">"+backward_text+"</span><span id=\"andrewds1021-categoryexhibitionautoadvance-halt\" class=\"wikia-menu-button\" style=\"padding: 0 5px;\" title=\""+halt_title+"\">"+halt_text+"</span><span id=\"andrewds1021-categoryexhibitionautoadvance-forward\" class=\"wikia-menu-button\" style=\"padding: 0 5px;\" title=\""+forward_title+"\">"+forward_text+"</span>";
        buttons.children[0].addEventListener("click", backward);
        buttons.children[1].addEventListener("click", halt);
        buttons.children[2].addEventListener("click", forward);
        paginator.parentElement.parentElement.insertAdjacentElement("afterend", buttons);
    }
    buttons.children[0].classList.remove("disabled");
    buttons.children[1].classList.remove("disabled");
    buttons.children[2].classList.remove("disabled");
    buttons.children[0].style.removeProperty("display");
    buttons.children[1].style.removeProperty("display");
    buttons.children[2].style.removeProperty("display");
    if (direction === "forward") {
        buttons.children[2].classList.add("disabled");
        buttons.children[2].style.display = "none";
    } else if (direction === "backward") {
        buttons.children[0].classList.add("disabled");
        buttons.children[0].style.display = "none";
    } else if (direction === "halt") {
        buttons.children[1].classList.add("disabled");
        buttons.children[1].style.display = "none";
    }
}

function removeTimer() {
    if (timer) clearInterval(timer);
    timer = false;
}

function goForward() {
    getPaginator();
    if (paginator) {
        var next = paginator.querySelector("li > .paginator-next:not(.disabled)");
        if (!next) next = paginator.querySelector("li:nth-of-type(2) > a");
        next.click();
    }
}

function goBackward() {
    getPaginator();
    if (paginator) {
        var next = paginator.querySelector("li > .paginator-prev:not(.disabled)");
        if (!next) next = paginator.querySelector("li:nth-last-of-type(2) > a");
        next.click();
    }
}

function getPaginator() {
    paginator = document.querySelector("#mw-pages > .category-gallery-paginator > .wikia-paginator > ul");
    if (!paginator) {
        removeTimer();
        if (buttons) buttons.parentElement.removeChild(buttons);
        buttons = false;
    }
}

})();
//