announcements.js

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//
// Functions to help with the rendering and the management of the announcement
// messages to be displayed at the top of the various community areas.


// Load in the json from the blog feed as tickerData.  The blog json template
// will do this for you
// <script type="text/javascript" src="http://blogs.madagascar.internal.fifeventures.co.uk:8888/rss.php?blogId=300000&amp;profile=json"></script>
dojo.require("dojo.parser");
dojo.require("dijit.layout.ContentPane");
dojo.require("dijit.layout.StackContainer");
dojo.require("dijit.form.Button");
dojo.require("dojo.fx");
dojo.require("dijit.layout.StackContainer");
dojo.require("dojox.layout.RadioGroup");

//djConfig.searchIds.push("piazzaAnnouncementTabContainer");

// Switch variable to decide if the announcements are playing
var play = true;

// The time to display each announcement
var announcementTimeout = 10000;

// The time to fade in and out buttons
var announcementButtonFade = 750;

// The maximum opaqueness of the buttons 
var announcemneEndFade = 1;

// Plays the announcemnet by displaying the next announcement
// and setting a timer to be called again.
function playIt() {
    console.debug('playIt');
    if (play) {
        var node = dijit.byId('piazzaAnnouncementTabContainer');
        node.forward();
        fadeOutButtons();
    }
    setTimeout("playIt()", announcementTimeout); 
}

// Stops announcements being played
function stopIt() {
    console.debug('stopIt');
    play = false;
}

// Starts announcements being played
function startIt() {
    console.debug('startIt');
    play = true;
}

// Mouse over on the announcement bar
function mouseOverAnnouncement() {
    console.debug('mouseOverAnnouncement');
    play = false; 
    fadeInButtons();
}

// Mouse out on the announcement bar
function mouseOutAnnouncement() {
    console.debug('mouseOutAnnouncement');
    play = true;
}

// Mouse over on next/previous ... controls
function mouseOverControl() {
    console.debug('mouseOverControl');
    play = false;
    fadeInButtons();
}

// Mouse out on next/previous ... controls
function mouseOutControl(node) {
    console.debug('mouseOutControl');
    fadeOutButtons();
    play = true;
}

function fadeOutButtons() {
    console.debug('fadeOutButtons');
    var previousBtn = dojo.byId('piazzaAnnouncementPreviousButton');
    var nextBtn = dojo.byId('piazzaAnnouncementNextButton');
    dojo.fadeOut({ node: previousBtn, duration: announcementButtonFade}).play();
    dojo.fadeOut({ node: nextBtn, duration: announcementButtonFade}).play();
}

function fadeInButtons() {
    console.debug('fadeInButtons');
    var previousBtn = dojo.byId('piazzaAnnouncementPreviousButton');
    var nextBtn = dojo.byId('piazzaAnnouncementNextButton');
    dojo.fadeIn({ node: previousBtn, end: announcemneEndFade, duration: announcementButtonFade}).play();
    dojo.fadeIn({ node: nextBtn, end: announcemneEndFade, duration: announcementButtonFade}).play();
}

function previousAnnouncement() {
    console.debug('previousAnnouncement');
    dijit.byId('piazzaAnnouncementTabContainer').back();
}

function nextAnnouncement() {
    console.debug('nextAnnouncement');
    dijit.byId('piazzaAnnouncementTabContainer').forward();
}

function makeButtonsVisible() {
    console.debug('makeButtonsVisible');
    var previousBtn = document.getElementById('piazzaAnnouncementPreviousButton');
    var nextBtn = document.getElementById('piazzaAnnouncementNextButton');
    previousBtn.style.visibility = 'visible';
    nextBtn.style.visibility = 'visible';
    
    if (previousBtn.addEventListener){
        previousBtn.addEventListener("mouseover", mouseOverControl, true);
        previousBtn.addEventListener("mouseout", mouseOutControl, true);
        previousBtn.addEventListener("click", previousAnnouncement, true);
        previousBtn.addEventListener("dblclick", previousAnnouncement, true);
    } 
    else if (previousBtn.attachEvent){
        previousBtn.attachEvent("onmouseover", mouseOverControl);
        previousBtn.attachEvent("onmouseout", mouseOutControl);
        previousBtn.attachEvent("onclick", previousAnnouncement);
        previousBtn.attachEvent("ondblclick", previousAnnouncement);
    }
    
    if (nextBtn.addEventListener){
        nextBtn.addEventListener("mouseover", mouseOverControl, true);
        nextBtn.addEventListener("mouseout", mouseOutControl, true);
        nextBtn.addEventListener("click", nextAnnouncement, true);
        nextBtn.addEventListener("dblclick", nextAnnouncement, true);
    } 
    else if (nextBtn.attachEvent){
        nextBtn.attachEvent("onmouseover", mouseOverControl);
        nextBtn.attachEvent("onmouseout", mouseOutControl);
        nextBtn.attachEvent("onclick", nextAnnouncement);
        nextBtn.attachEvent("ondblclick", nextAnnouncement);
    }
}

function isset(variableName) {
    console.debug('isset');
    return Boolean(typeof(variableName) != 'undefined');
}

// Builds up the announcements by adding the panels from the feed/tickerData
function buildAnnouncement() {
    console.debug('buildAnnouncement');
    var node = dijit.byId('piazzaAnnouncementTabContainer');
    // Check to see if tickerData is loaded yet
    if ((typeof(tickerData) != 'undefined') && node) {
        // Iterate over feed
        for (i = 0; i < tickerData.length; i++) {
            paneContent = '<div dojoType="dijit.layout.ContentPane" title="Dojo" class="piazzaAnnouncementPane dojoxPane" onMouseOver="mouseOverAnnouncement(this)" onMouseOut="mouseOutAnnouncement(this)"><a href="' 
                + tickerData[i]['url'] 
                + '">' 
                + tickerData[i]['title']
                + '</a></div>';
                pane = new dijit.layout.ContentPane({
                    title: tickerData[i]['description']
                }
            );
            pane.setContent(paneContent);
            node.addChild(pane);
        }
        // Restart the StackPanel
        node.startup();
        makeButtonsVisible();
        fadeOutButtons();

        // Setup the callback
        setTimeout("playIt()", announcementTimeout);
    }
    else {
        // The feed data has not been loaded.  Try again soon.
        setTimeout("buildAnnouncement()", 500);
    }
}

// run buildAnnouncement once the feed has been loaded.
dojo.addOnLoad(function(){ buildAnnouncement(); });