view interfaces/horizontal-sliders.js @ 2376:c41caaa96633

Some fixes for #90. Also a failsafe loop if the server never responds with meaningul information from saves (for instance, running only on apache or basic http servers). More changes to pythonServer for python 3.5. Please check if still valid on 2.7

// 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 = 'Next';
	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 = "100px";
	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 '+(testState.stateIndex+1)+' of '+testState.stateMap.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 index = 0;
	$(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 interfaceContext.outsideReferenceDOM(audioObject,index,document.getElementById('interface-buttons'));
			audioObject.bindInterface(orNode);
		} else {
			// Create a slider per track
            switch(audioObject.specification.parent.label) {
                case "none":
                    label = "";
                    break;
                case "letter":
                    label = String.fromCharCode(97 + index);
                    break;
                case "capital":
                    label = String.fromCharCode(65 + index);
                    break;
                default:
                    label = ""+index;
                    break;
            }
			var sliderObj = new sliderObject(audioObject,label);
			
			if (typeof page.initialPosition === "number")
			{
				// Set the values
				sliderObj.slider.value = page.initalPosition;
			} else {
				// Distribute it randomnly
				sliderObj.slider.value = Math.random();
			}
			sliderBox.appendChild(sliderObj.holder);
			audioObject.bindInterface(sliderObj);
            interfaceContext.commentBoxes.createCommentBox(audioObject);
			index += 1;
		}
        
	});
	if (page.showElementComments)
    {
        interfaceContext.commentBoxes.showCommentBoxes(feedbackHolder,true);
    }
	// Auto-align
	resizeWindow(null);
}

function sliderObject(audioObject,label)
{
	// 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( )
	this.parent = audioObject;
	
	this.holder = document.createElement('div');
	this.title = document.createElement('div');
	this.slider = document.createElement('input');
	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.slider);
	this.holder.appendChild(this.play);
	this.holder.setAttribute('trackIndex',audioObject.id);
	this.title.textContent = label;
	this.title.className = 'track-slider-title';
	
	this.slider.type = "range";
	this.slider.className = "track-slider-range track-slider-not-moved";
	this.slider.min = "0";
	this.slider.max = "1";
	this.slider.step = "0.01";
	this.slider.style.width = window.innerWidth-420 + 'px';
	this.slider.onchange = function()
	{
		var time = audioEngineContext.timer.getTestTime();
		var id = Number(this.parentNode.getAttribute('trackIndex'));
		audioEngineContext.audioObjects[id].metric.moved(time,this.value);
		console.log('slider '+id+' moved to '+this.value+' ('+time+')');
		$(this).removeClass('track-slider-not-moved');
	};
	
	this.play.className = 'track-slider-button';
	this.play.textContent = "Loading...";
	this.play.value = audioObject.id;
	this.play.disabled = true;
    this.play.setAttribute("playstate","ready");
	this.play.onclick = function(event)
	{
		var id = Number(event.currentTarget.value);
		//audioEngineContext.metric.sliderPlayed(id);
        if (event.currentTarget.getAttribute("playstate") == "ready")
        {audioEngineContext.play(id);}
        else if (event.currentTarget.getAttribute("playstate") == "playing")
        {audioEngineContext.stop();}
	};
	this.resize = function(event)
	{
		this.holder.style.width = window.innerWidth-200 + 'px';
		this.slider.style.width = window.innerWidth-420 + '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 when playback has begun
        this.play.setAttribute("playstate","playing");
        $(".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 when playback has stopped. This gets called even if playback never started!
        this.play.setAttribute("playstate","ready");
        $(this.holder).removeClass('track-slider-playing');
    };
	this.getValue = function()
	{
		// Return the current value of the object. If there is no value, return 0
		return this.slider.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.slider.value;
        return node;
	};
    this.error = function() {
            // audioObject has an error!!
        this.playback.textContent = "Error";
        $(this.playback).addClass("error-colour");
    }
};

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 * 125)-25;
	document.getElementById('scale-holder').style.width = window.innerWidth-220 + 'px';
	var canvas = document.getElementById('scale-canvas');
	canvas.width = window.innerWidth-420;
	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").style.height = totalHeight+50+'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 = Math.ceil($(text).width())+'px';
		text.style.left = (posPix+100-($(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 has been used effectively
                var checkState = interfaceContext.checkScaleRange(checks[i].min,checks[i].max);
                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)
	        {
	            interfaceContext.lightbox.post("Warning",'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();
}