annotate interfaces/discrete.js @ 1160:f0fa49f5bbb0

Interfaces have startPlayback and stopPlayback methods to clean up code management. Looping playbacks now have a 2s cross-fade.

// Once this is loaded and parsed, begin execution
loadInterface();

function loadInterface() {
	// Use this to do any one-time page / element construction. For instance, placing any stationary text objects,
	// holding div's, or setting up any nodes which are present for the entire test sequence
	
	// The injection point into the HTML page
	interfaceContext.insertPoint = document.getElementById("topLevelBody");
	var testContent = document.createElement('div');
	testContent.id = 'testContent';
	
	// Create the top div for the Title element
	var titleAttr = specification.title;
	var title = document.createElement('div');
	title.className = "title";
	title.align = "center";
	var titleSpan = document.createElement('span');
	
	// Set title to that defined in XML, else set to default
	if (titleAttr != undefined) {
		titleSpan.textContent = titleAttr;
	} else {
		titleSpan.textContent =  'Listening test';
	}
	// Insert the titleSpan element into the title div element.
	title.appendChild(titleSpan);
	
	var pagetitle = document.createElement('div');
	pagetitle.className = "pageTitle";
	pagetitle.align = "center";
	var titleSpan = document.createElement('span');
	titleSpan.id = "pageTitle";
	pagetitle.appendChild(titleSpan);
	
	// Create Interface buttons!
	var interfaceButtons = document.createElement('div');
	interfaceButtons.id = 'interface-buttons';
	interfaceButtons.style.height = '25px';
	
	// Create playback start/stop points
	var playback = document.createElement("button");
	playback.innerHTML = 'Stop';
	playback.id = 'playback-button';
	playback.style.float = 'left';
	// onclick function. Check if it is playing or not, call the correct function in the
	// audioEngine, change the button text to reflect the next state.
	playback.onclick = function() {
		if (audioEngineContext.status == 1) {
			audioEngineContext.stop();
			this.innerHTML = 'Stop';
            var time = audioEngineContext.timer.getTestTime();
            console.log('Stopped at ' + time); // DEBUG/SAFETY
		}
	};
	// Create Submit (save) button
	var submit = document.createElement("button");
	submit.innerHTML = 'Submit';
	submit.onclick = buttonSubmitClick;
	submit.id = 'submit-button';
	submit.style.float = 'left';
	// Append the interface buttons into the interfaceButtons object.
	interfaceButtons.appendChild(playback);
	interfaceButtons.appendChild(submit);
	
	// Create a slider box
	var sliderBox = document.createElement('div');
	sliderBox.style.width = "100%";
	sliderBox.style.height = window.innerHeight - 200+12 + 'px';
	sliderBox.style.marginBottom = '10px';
	sliderBox.id = 'slider';
	var scaleHolder = document.createElement('div');
	scaleHolder.id = "scale-holder";
	scaleHolder.style.marginLeft = "107px";
	sliderBox.appendChild(scaleHolder);
	var scaleText = document.createElement('div');
	scaleText.id = "scale-text-holder";
	scaleText.style.height = "25px";
	scaleText.style.width = "100%";
	scaleHolder.appendChild(scaleText);
	var scaleCanvas = document.createElement('canvas');
	scaleCanvas.id = "scale-canvas";
	scaleCanvas.style.marginLeft = "150px";
	scaleHolder.appendChild(scaleCanvas);
	var sliderObjectHolder = document.createElement('div');
	sliderObjectHolder.id = 'slider-holder';
	sliderObjectHolder.align = "center";
	sliderBox.appendChild(sliderObjectHolder);
	
	// Global parent for the comment boxes on the page
	var feedbackHolder = document.createElement('div');
	feedbackHolder.id = 'feedbackHolder';
	
	testContent.style.zIndex = 1;
	interfaceContext.insertPoint.innerHTML = null; // Clear the current schema
	
	// Inject into HTML
	testContent.appendChild(title); // Insert the title
	testContent.appendChild(pagetitle);
	testContent.appendChild(interfaceButtons);
	testContent.appendChild(sliderBox);
	testContent.appendChild(feedbackHolder);
	interfaceContext.insertPoint.appendChild(testContent);

	// Load the full interface
	testState.initialise();
	testState.advanceState();
};

function loadTest(page)
{
	// Called each time a new test page is to be build. The page specification node is the only item passed in
	var id = page.id;
	
	var feedbackHolder = document.getElementById('feedbackHolder');
    feedbackHolder.innerHTML = null;
	var interfaceObj = page.interfaces;
	if (interfaceObj.length > 1)
	{
		console.log("WARNING - This interface only supports one <interface> node per page. Using first interface node");
	}
	interfaceObj = interfaceObj[0];
	if(interfaceObj.title != null)
	{
		document.getElementById("pageTitle").textContent = interfaceObj.title;
	}
    
    var interfaceOptions = specification.interfaces.options.concat(interfaceObj.options);
    for (var option of interfaceOptions)
    {
        if (option.type == "show")
        {
            switch(option.name) {
                case "playhead":
                    var playbackHolder = document.getElementById('playback-holder');
                    if (playbackHolder == null)
                    {
                        playbackHolder = document.createElement('div');
                        playbackHolder.style.width = "100%";
                        playbackHolder.align = 'center';
                        playbackHolder.appendChild(interfaceContext.playhead.object);
                        feedbackHolder.appendChild(playbackHolder);
                    }
                    break;
                case "page-count":
                    var pagecountHolder = document.getElementById('page-count');
                    if (pagecountHolder == null)
                    {
                        pagecountHolder = document.createElement('div');
                        pagecountHolder.id = 'page-count';
                    }
                    pagecountHolder.innerHTML = '<span>Page '+(page.presentedId+1)+' of '+specification.pages.length+'</span>';
                    var inject = document.getElementById('interface-buttons');
                    inject.appendChild(pagecountHolder);
                    break;
                case "volume":
                    if (document.getElementById('master-volume-holder') == null)
                    {
                        feedbackHolder.appendChild(interfaceContext.volume.object);
                    }
                    break;
            }
        }
    }
	
	// Delete outside reference
	var outsideReferenceHolder = document.getElementById('outside-reference');
	if (outsideReferenceHolder != null) {
		document.getElementById('interface-buttons').removeChild(outsideReferenceHolder);
	}
	
	var sliderBox = document.getElementById('slider-holder');
	sliderBox.innerHTML = null;
	
	var commentBoxPrefix = "Comment on track";
	if (interfaceObj.commentBoxPrefix != undefined) {
		commentBoxPrefix = interfaceObj.commentBoxPrefix;
	}
	var loopPlayback = page.loop;
	
	$(page.commentQuestions).each(function(index,element) {
		var node = interfaceContext.createCommentQuestion(element);
		feedbackHolder.appendChild(node.holder);
	});
	
	// Find all the audioElements from the audioHolder
	var label = 0;
	var interfaceScales = testState.currentStateMap.interfaces[0].scales;
	$(page.audioElements).each(function(index,element){
		// Find URL of track
		// In this jQuery loop, variable 'this' holds the current audioElement.
		
		var audioObject = audioEngineContext.newTrack(element);
		if (element.type == 'outside-reference')
		{
			// Construct outside reference;
			var orNode = new outsideReferenceDOM(audioObject,index,document.getElementById('interface-buttons'));
			audioObject.bindInterface(orNode);
		} else {
			var node = interfaceContext.createCommentBox(audioObject);
		
			// Create a slider per track
			var sliderObj = new discreteObject(audioObject,label,interfaceScales);
			sliderBox.appendChild(sliderObj.holder);
			audioObject.bindInterface(sliderObj);
			label += 1;
		}
        
	});
	
	// Auto-align
	resizeWindow(null);
}

function discreteObject(audioObject,label,interfaceScales)
{
	// An example node, you can make this however you want for each audioElement.
	// However, every audioObject (audioEngineContext.audioObject) MUST have an interface object with the following
	// You attach them by calling audioObject.bindInterface( )
	if (interfaceScales == null || interfaceScales.length == 0)
	{
		console.log("WARNING: The discrete radio's are built depending on the number of scale points specified! Ensure you have some specified. Defaulting to 5 for now!");
		numOptions = 5;
	}
	this.parent = audioObject;
	
	this.holder = document.createElement('div');
	this.title = document.createElement('div');
	this.discreteHolder = document.createElement('div');
	this.discretes = [];
	this.play = document.createElement('button');
	
	this.holder.className = 'track-slider';
	this.holder.style.width = window.innerWidth-200 + 'px';
	this.holder.appendChild(this.title);
	this.holder.appendChild(this.discreteHolder);
	this.holder.appendChild(this.play);
	this.holder.setAttribute('trackIndex',audioObject.id);
	this.title.textContent = label;
	this.title.className = 'track-slider-title';
	
	this.discreteHolder.className = "track-slider-range";
	this.discreteHolder.style.width = window.innerWidth-500 + 'px';
	for (var i=0; i<interfaceScales.length; i++)
	{
		var node = document.createElement('input');
		node.setAttribute('type','radio');
		node.className = 'track-radio';
		node.setAttribute('position',interfaceScales[i].position);
		node.setAttribute('name',audioObject.specification.id);
		node.setAttribute('id',audioObject.specification.id+'-'+String(i));
		this.discretes.push(node);
		this.discreteHolder.appendChild(node);
		node.onclick = function(event)
		{
			if (audioEngineContext.status == 0)
			{
				event.currentTarget.checked = false;
				return;
			}
			var time = audioEngineContext.timer.getTestTime();
			var id = Number(event.currentTarget.parentNode.parentNode.getAttribute('trackIndex'));
			var value = event.currentTarget.getAttribute('position') / 100.0;
			audioEngineContext.audioObjects[id].metric.moved(time,value);
			console.log('slider '+id+' moved to '+value+' ('+time+')');
		};
	}
	
	this.play.className = 'track-slider-button';
	this.play.textContent = "Loading...";
	this.play.value = audioObject.id;
	this.play.disabled = true;
	this.play.onclick = function(event)
	{
		var id = Number(event.currentTarget.value);
		//audioEngineContext.metric.sliderPlayed(id);
		audioEngineContext.play(id);
	};
	this.resize = function(event)
	{
		this.holder.style.width = window.innerWidth-200 + 'px';
		this.discreteHolder.style.width = window.innerWidth-500 + 'px';
		//text.style.left = (posPix+150-($(text).width()/2)) +'px';
		for (var i=0; i<this.discretes.length; i++)
		{
			var width = $(this.discreteHolder).width() - 20;
			var node = this.discretes[i];
			var nodeW = $(node).width();
			var position = node.getAttribute('position');
			var posPix = Math.round(width * (position / 100.0));
			node.style.left = (posPix+10 - (nodeW/2)) + 'px';
		}
	};
	this.enable = function()
	{
		// This is used to tell the interface object that playback of this node is ready
		this.play.disabled = false;
		this.play.textContent = "Play";
		$(this.slider).removeClass('track-slider-disabled');
	};
	this.updateLoading = function(progress)
	{
		// progress is a value from 0 to 100 indicating the current download state of media files
	};
    
    this.startPlayback = function()
    {
        // Called by audioObject when playback begins
        $(".track-slider").removeClass('track-slider-playing');
		$(this.holder).addClass('track-slider-playing');
		var outsideReference = document.getElementById('outside-reference');
		if (outsideReference != null) {
			$(outsideReference).removeClass('track-slider-playing');
		}
    }
    this.stopPlayback = function()
    {
        // Called by audioObject when playback stops
        $(this.holder).removeClass('track-slider-playing');
    }
    
	this.getValue = function()
	{
		// Return the current value of the object. If there is no value, return -1
		var value = -1;
		for (var i=0; i<this.discretes.length; i++)
		{
			if (this.discretes[i].checked == true)
			{
				value = this.discretes[i].getAttribute('position') / 100.0;
				break;
			}
		}
		return value;
	};
	this.getPresentedId = function()
	{
		// Return the presented ID of the object. For instance, the APE has sliders starting from 0. Whilst AB has alphabetical scale
		return this.title.textContent;
	};
	this.canMove = function()
	{
		// Return either true or false if the interface object can be moved. AB / Reference cannot, whilst sliders can and therefore have a continuous scale.
		// These are checked primarily if the interface check option 'fragmentMoved' is enabled.
		return true;
	};
	this.exportXMLDOM = function(audioObject) {
		// Called by the audioObject holding this element to export the interface <value> node.
		// If there is no value node (such as outside reference), return null
		// If there are multiple value nodes (such as multiple scale / 2D scales), return an array of nodes with each value node having an 'interfaceName' attribute
		// Use storage.document.createElement('value'); to generate the XML node.
		var node = storage.document.createElement('value');
		node.textContent = this.getValue();
		return node;
	};
};

function resizeWindow(event)
{
	// Called on every window resize event, use this to scale your page properly
	var numObj = document.getElementsByClassName('track-slider').length;
	var totalHeight = (numObj * 66)-30;
	document.getElementById('scale-holder').style.width = window.innerWidth-220 + 'px';
	var canvas = document.getElementById('scale-canvas');
	canvas.width = window.innerWidth-520;
	canvas.height = totalHeight;
	for (var i in audioEngineContext.audioObjects)
	{
		if (audioEngineContext.audioObjects[i].specification.type != 'outside-reference'){
			audioEngineContext.audioObjects[i].interfaceDOM.resize(event);
		}
	}
    document.getElementById('slider-holder').style.height = totalHeight + 'px';
    document.getElementById('slider').style.height = totalHeight + 70 + 'px';
	drawScale();
}

function drawScale()
{
	var interfaceObj = testState.currentStateMap.interfaces[0];
	var scales = testState.currentStateMap.interfaces[0].scales;
	scales = scales.sort(function(a,b) {
		return a.position - b.position;
	});
	var canvas = document.getElementById('scale-canvas');
	var ctx = canvas.getContext("2d");
	var height = canvas.height;
	var width = canvas.width;
	var textHolder = document.getElementById('scale-text-holder');
	textHolder.innerHTML = null;
	ctx.fillStyle = "#000000";
	ctx.setLineDash([1,4]);
	for (var scale of scales)
	{
		var posPercent = scale.position / 100.0;
		var posPix = Math.round(width * posPercent);
		if(posPix<=0){posPix=1;}
		if(posPix>=width){posPix=width-1;}
		ctx.moveTo(posPix,0);
		ctx.lineTo(posPix,height);
		ctx.stroke();
		
		var text = document.createElement('div');
		text.align = "center";
		var textC = document.createElement('span');
		textC.textContent = scale.text;
		text.appendChild(textC);
		text.className = "scale-text";
		textHolder.appendChild(text);
		text.style.width = $(text.children[0]).width()+'px';
		text.style.left = (posPix+150-($(text).width()/2)) +'px';
	}
}

function buttonSubmitClick() // TODO: Only when all songs have been played!
{
	var checks = [];
	checks = checks.concat(testState.currentStateMap.interfaces[0].options);
	checks = checks.concat(specification.interfaces.options);
	var canContinue = true;
	
	// Check that the anchor and reference objects are correctly placed
	if (interfaceContext.checkHiddenAnchor() == false) {return;}
	if (interfaceContext.checkHiddenReference() == false) {return;}
	
	for (var i=0; i<checks.length; i++) {
		if (checks[i].type == 'check')
		{
			switch(checks[i].name) {
			case 'fragmentPlayed':
				// Check if all fragments have been played
				var checkState = interfaceContext.checkAllPlayed();
				if (checkState == false) {canContinue = false;}
				break;
			case  'fragmentFullPlayback':
				// Check all fragments have been played to their full length
				var checkState = interfaceContext.checkAllPlayed();
				if (checkState == false) {canContinue = false;}
				console.log('NOTE: fragmentFullPlayback not currently implemented, performing check fragmentPlayed instead');
				break;
			case 'fragmentMoved':
				// Check all fragment sliders have been moved.
				var checkState = interfaceContext.checkAllMoved();
				if (checkState == false) {canContinue = false;}
				break;
			case 'fragmentComments':
				// Check all fragment sliders have been moved.
				var checkState = interfaceContext.checkAllCommented();
				if (checkState == false) {canContinue = false;}
				break;
			//case 'scalerange':
				// Check the scale is used to its full width outlined by the node
				//var checkState = interfaceContext.checkScaleRange();
				//if (checkState == false) {canContinue = false;}
			//	break;
			default:
				console.log("WARNING - Check option "+checks[i].check+" is not supported on this interface");
				break;
			}

		}
		if (!canContinue) {break;}
	}
	
    if (canContinue) {
	    if (audioEngineContext.status == 1) {
	        var playback = document.getElementById('playback-button');
	        playback.click();
	    // This function is called when the submit button is clicked. Will check for any further tests to perform, or any post-test options
	    } else
	    {
	        if (audioEngineContext.timer.testStarted == false)
	        {
	            alert('You have not started the test! Please press start to begin the test!');
	            return;
	        }
	    }
	    testState.advanceState();
    } 
}

function pageXMLSave(store, pageSpecification)
{
	// MANDATORY
	// Saves a specific test page
	// You can use this space to add any extra nodes to your XML <audioHolder> saves
	// Get the current <page> information in store (remember to appendChild your data to it)
	// pageSpecification is the current page node configuration
	// To create new XML nodes, use storage.document.createElement();
}