ERPNext Open Day - June 2013 - by Anand Doshi

impress.js

/**
 * impress.js
 *
 * impress.js is a presentation tool based on the power of CSS3 transforms and transitions
 * in modern browsers and inspired by the idea behind prezi.com.
 *
 *
 * Copyright 2011-2012 Bartek Szopka (@bartaz)
 *
 * Released under the MIT and GPL Licenses.
 *
 * ------------------------------------------------
 *  author:  Bartek Szopka
 *  version: 0.5.3
 *  url:     http://bartaz.github.com/impress.js/
 *  source:  http://github.com/bartaz/impress.js/
 */

/*jshint bitwise:true, curly:true, eqeqeq:true, forin:true, latedef:true, newcap:true,
         noarg:true, noempty:true, undef:true, strict:true, browser:true */

// You are one of those who like to know how thing work inside?
// Let me show you the cogs that make impress.js run...
(function ( document, window ) {
    'use strict';
    
    // HELPER FUNCTIONS
    
    // `pfx` is a function that takes a standard CSS property name as a parameter
    // and returns it's prefixed version valid for current browser it runs in.
    // The code is heavily inspired by Modernizr http://www.modernizr.com/
    var pfx = (function () {
        
        var style = document.createElement('dummy').style,
            prefixes = 'Webkit Moz O ms Khtml'.split(' '),
            memory = {};
        
        return function ( prop ) {
            if ( typeof memory[ prop ] === "undefined" ) {
                
                var ucProp  = prop.charAt(0).toUpperCase() + prop.substr(1),
                    props   = (prop + ' ' + prefixes.join(ucProp + ' ') + ucProp).split(' ');
                
                memory[ prop ] = null;
                for ( var i in props ) {
                    if ( style[ props[i] ] !== undefined ) {
                        memory[ prop ] = props[i];
                        break;
                    }
                }
            
            }
            
            return memory[ prop ];
        };
    
    })();
    
    // `arraify` takes an array-like object and turns it into real Array
    // to make all the Array.prototype goodness available.
    var arrayify = function ( a ) {
        return [].slice.call( a );
    };
    
    // `css` function applies the styles given in `props` object to the element
    // given as `el`. It runs all property names through `pfx` function to make
    // sure proper prefixed version of the property is used.
    var css = function ( el, props ) {
        var key, pkey;
        for ( key in props ) {
            if ( props.hasOwnProperty(key) ) {
                pkey = pfx(key);
                if ( pkey !== null ) {
                    el.style[pkey] = props[key];
                }
            }
        }
        return el;
    };
    
    // `toNumber` takes a value given as `numeric` parameter and tries to turn
    // it into a number. If it is not possible it returns 0 (or other value
    // given as `fallback`).
    var toNumber = function (numeric, fallback) {
        return isNaN(numeric) ? (fallback || 0) : Number(numeric);
    };
    
    // `byId` returns element with given `id` - you probably have guessed that ;)
    var byId = function ( id ) {
        return document.getElementById(id);
    };
    
    // `$` returns first element for given CSS `selector` in the `context` of
    // the given element or whole document.
    var $ = function ( selector, context ) {
        context = context || document;
        return context.querySelector(selector);
    };
    
    // `$$` return an array of elements for given CSS `selector` in the `context` of
    // the given element or whole document.
    var $$ = function ( selector, context ) {
        context = context || document;
        return arrayify( context.querySelectorAll(selector) );
    };
    
    // `triggerEvent` builds a custom DOM event with given `eventName` and `detail` data
    // and triggers it on element given as `el`.
    var triggerEvent = function (el, eventName, detail) {
        var event = document.createEvent("CustomEvent");
        event.initCustomEvent(eventName, true, true, detail);
        el.dispatchEvent(event);
    };
    
    // `translate` builds a translate transform string for given data.
    var translate = function ( t ) {
        return " translate3d(" + t.x + "px," + t.y + "px," + t.z + "px) ";
    };
    
    // `rotate` builds a rotate transform string for given data.
    // By default the rotations are in X Y Z order that can be reverted by passing `true`
    // as second parameter.
    var rotate = function ( r, revert ) {
        var rX = " rotateX(" + r.x + "deg) ",
            rY = " rotateY(" + r.y + "deg) ",
            rZ = " rotateZ(" + r.z + "deg) ";
        
        return revert ? rZ+rY+rX : rX+rY+rZ;
    };
    
    // `scale` builds a scale transform string for given data.
    var scale = function ( s ) {
        return " scale(" + s + ") ";
    };
    
    // `perspective` builds a perspective transform string for given data.
    var perspective = function ( p ) {
        return " perspective(" + p + "px) ";
    };
    
    // `getElementFromHash` returns an element located by id from hash part of
    // window location.
    var getElementFromHash = function () {
        // get id from url # by removing `#` or `#/` from the beginning,
        // so both "fallback" `#slide-id` and "enhanced" `#/slide-id` will work
        return byId( window.location.hash.replace(/^#\/?/,"") );
    };
    
    // `computeWindowScale` counts the scale factor between window size and size
    // defined for the presentation in the config.
    var computeWindowScale = function ( config ) {
        var hScale = window.innerHeight / config.height,
            wScale = window.innerWidth / config.width,
            scale = hScale > wScale ? wScale : hScale;
        
        if (config.maxScale && scale > config.maxScale) {
            scale = config.maxScale;
        }
        
        if (config.minScale && scale < config.minScale) {
            scale = config.minScale;
        }
        
        return scale;
    };
    
    // CHECK SUPPORT
    var body = document.body;
    
    var ua = navigator.userAgent.toLowerCase();
    var impressSupported = 
                          // browser should support CSS 3D transtorms 
                           ( pfx("perspective") !== null ) &&
                           
                          // and `classList` and `dataset` APIs
                           ( body.classList ) &&
                           ( body.dataset ) &&
                           
                          // but some mobile devices need to be blacklisted,
                          // because their CSS 3D support or hardware is not
                          // good enough to run impress.js properly, sorry...
                           ( ua.search(/(iphone)|(ipod)|(android)/) === -1 );
    
    if (!impressSupported) {
        // we can't be sure that `classList` is supported
        body.className += " impress-not-supported ";
    } else {
        body.classList.remove("impress-not-supported");
        body.classList.add("impress-supported");
    }
    
    // GLOBALS AND DEFAULTS
    
    // This is were the root elements of all impress.js instances will be kept.
    // Yes, this means you can have more than one instance on a page, but I'm not
    // sure if it makes any sense in practice ;)
    var roots = {};
    
    // some default config values.
    var defaults = {
        width: 1024,
        height: 768,
        maxScale: 1,
        minScale: 0,
        
        perspective: 1000,
        
        transitionDuration: 1000
    };
    
    // it's just an empty function ... and a useless comment.
    var empty = function () { return false; };
    
    // IMPRESS.JS API
    
    // And that's where interesting things will start to happen.
    // It's the core `impress` function that returns the impress.js API
    // for a presentation based on the element with given id ('impress'
    // by default).
    var impress = window.impress = function ( rootId ) {
        
        // If impress.js is not supported by the browser return a dummy API
        // it may not be a perfect solution but we return early and avoid
        // running code that may use features not implemented in the browser.
        if (!impressSupported) {
            return {
                init: empty,
                goto: empty,
                prev: empty,
                next: empty
            };
        }
        
        rootId = rootId || "impress";
        
        // if given root is already initialized just return the API
        if (roots["impress-root-" + rootId]) {
            return roots["impress-root-" + rootId];
        }
        
        // data of all presentation steps
        var stepsData = {};
        
        // element of currently active step
        var activeStep = null;
        
        // current state (position, rotation and scale) of the presentation
        var currentState = null;
        
        // array of step elements
        var steps = null;
        
        // configuration options
        var config = null;
        
        // scale factor of the browser window
        var windowScale = null;        
        
        // root presentation elements
        var root = byId( rootId );
        var canvas = document.createElement("div");
        
        var initialized = false;
        
        // STEP EVENTS
        //
        // There are currently two step events triggered by impress.js
        // `impress:stepenter` is triggered when the step is shown on the 
        // screen (the transition from the previous one is finished) and
        // `impress:stepleave` is triggered when the step is left (the
        // transition to next step just starts).
        
        // reference to last entered step
        var lastEntered = null;
        
        // `onStepEnter` is called whenever the step element is entered
        // but the event is triggered only if the step is different than
        // last entered step.
        var onStepEnter = function (step) {
            if (lastEntered !== step) {
                triggerEvent(step, "impress:stepenter");
                lastEntered = step;
            }
        };
        
        // `onStepLeave` is called whenever the step element is left
        // but the event is triggered only if the step is the same as
        // last entered step.
        var onStepLeave = function (step, nextStep) {
            if (lastEntered === step) {
                triggerEvent(step, "impress:stepleave", { nextStep: nextStep.el });
                lastEntered = null;
            }
        };
        
        // `initStep` initializes given step element by reading data from its
        // data attributes and setting correct styles.
        var initStep = function ( el, idx ) {
            var data = el.dataset,
                step = {
                    translate: {
                        x: toNumber(data.x),
                        y: toNumber(data.y),
                        z: toNumber(data.z)
                    },
                    rotate: {
                        x: toNumber(data.rotateX),
                        y: toNumber(data.rotateY),
                        z: toNumber(data.rotateZ || data.rotate)
                    },
                    scale: toNumber(data.scale, 1),
                    el: el
                };
            
            if ( !el.id ) {
                el.id = "step-" + (idx + 1);
            }
            
            stepsData["impress-" + el.id] = step;
            
            css(el, {
                position: "absolute",
                transform: "translate(-50%,-50%)" +
                           translate(step.translate) +
                           rotate(step.rotate) +
                           scale(step.scale),
                transformStyle: "preserve-3d"
            });
        };
        
        // `init` API function that initializes (and runs) the presentation.
        var init = function () {
            if (initialized) { return; }
            
            // First we set up the viewport for mobile devices.
            // For some reason iPad goes nuts when it is not done properly.
            var meta = $("meta[name='viewport']") || document.createElement("meta");
            meta.content = "width=device-width, minimum-scale=1, maximum-scale=1, user-scalable=no";
            if (meta.parentNode !== document.head) {
                meta.name = 'viewport';
                document.head.appendChild(meta);
            }
            
            // initialize configuration object
            var rootData = root.dataset;
            config = {
                width: toNumber( rootData.width, defaults.width ),
                height: toNumber( rootData.height, defaults.height ),
                maxScale: toNumber( rootData.maxScale, defaults.maxScale ),
                minScale: toNumber( rootData.minScale, defaults.minScale ),                
                perspective: toNumber( rootData.perspective, defaults.perspective ),
                transitionDuration: toNumber( rootData.transitionDuration, defaults.transitionDuration )
            };
            
            windowScale = computeWindowScale( config );
            
            // wrap steps with "canvas" element
            arrayify( root.childNodes ).forEach(function ( el ) {
                canvas.appendChild( el );
            });
            root.appendChild(canvas);
            
            // set initial styles
            document.documentElement.style.height = "100%";
            
            css(body, {
                height: "100%",
                overflow: "hidden"
            });
            
            var rootStyles = {
                position: "absolute",
                transformOrigin: "top left",
                transition: "all 0s ease-in-out",
                transformStyle: "preserve-3d"
            };
            
            css(root, rootStyles);
            css(root, {
                top: "50%",
                left: "50%",
                transform: perspective( config.perspective/windowScale ) + scale( windowScale )
            });
            css(canvas, rootStyles);
            
            body.classList.remove("impress-disabled");
            body.classList.add("impress-enabled");
            
            // get and init steps
            steps = $$(".step", root);
            steps.forEach( initStep );
            
            // set a default initial state of the canvas
            currentState = {
                translate: { x: 0, y: 0, z: 0 },
                rotate:    { x: 0, y: 0, z: 0 },
                scale:     1
            };
            
            initialized = true;
            
            triggerEvent(root, "impress:init", { api: roots[ "impress-root-" + rootId ] });
        };
        
        // `getStep` is a helper function that returns a step element defined by parameter.
        // If a number is given, step with index given by the number is returned, if a string
        // is given step element with such id is returned, if DOM element is given it is returned
        // if it is a correct step element.
        var getStep = function ( step ) {
            if (typeof step === "number") {
                step = step < 0 ? steps[ steps.length + step] : steps[ step ];
            } else if (typeof step === "string") {
                step = byId(step);
            }
            return (step && step.id && stepsData["impress-" + step.id]) ? step : null;
        };
        
        // used to reset timeout for `impress:stepenter` event
        var stepEnterTimeout = null;
        
        // `goto` API function that moves to step given with `el` parameter (by index, id or element),
        // with a transition `duration` optionally given as second parameter.
        var goto = function ( el, duration ) {
            
            if ( !initialized || !(el = getStep(el)) ) {
                // presentation not initialized or given element is not a step
                return false;
            }
            
            // Sometimes it's possible to trigger focus on first link with some keyboard action.
            // Browser in such a case tries to scroll the page to make this element visible
            // (even that body overflow is set to hidden) and it breaks our careful positioning.
            //
            // So, as a lousy (and lazy) workaround we will make the page scroll back to the top
            // whenever slide is selected
            //
            // If you are reading this and know any better way to handle it, I'll be glad to hear about it!
            window.scrollTo(0, 0);
            
            var step = stepsData["impress-" + el.id];
            
            if ( activeStep ) {
                activeStep.classList.remove("active");
                body.classList.remove("impress-on-" + activeStep.id);
            }
            el.classList.add("active");
            
            body.classList.add("impress-on-" + el.id);
            
            // compute target state of the canvas based on given step
            var target = {
                rotate: {
                    x: -step.rotate.x,
                    y: -step.rotate.y,
                    z: -step.rotate.z
                },
                translate: {
                    x: -step.translate.x,
                    y: -step.translate.y,
                    z: -step.translate.z
                },
                scale: 1 / step.scale
            };
            
            // Check if the transition is zooming in or not.
            //
            // This information is used to alter the transition style:
            // when we are zooming in - we start with move and rotate transition
            // and the scaling is delayed, but when we are zooming out we start
            // with scaling down and move and rotation are delayed.
            var zoomin = target.scale >= currentState.scale;
            
            duration = toNumber(duration, config.transitionDuration);
            var delay = (duration / 2);
            
            // if the same step is re-selected, force computing window scaling,
            // because it is likely to be caused by window resize
            if (el === activeStep) {
                windowScale = computeWindowScale(config);
            }
            
            var targetScale = target.scale * windowScale;
            
            // trigger leave of currently active element (if it's not the same step again)
            if (activeStep && activeStep !== el) {
                onStepLeave(activeStep, step);
            }
            
            // Now we alter transforms of `root` and `canvas` to trigger transitions.
            //
            // And here is why there are two elements: `root` and `canvas` - they are
            // being animated separately:
            // `root` is used for scaling and `canvas` for translate and rotations.
            // Transitions on them are triggered with different delays (to make
            // visually nice and 'natural' looking transitions), so we need to know
            // that both of them are finished.
            css(root, {
                // to keep the perspective look similar for different scales
                // we need to 'scale' the perspective, too
                transform: perspective( config.perspective / targetScale ) + scale( targetScale ),
                transitionDuration: duration + "ms",
                transitionDelay: (zoomin ? delay : 0) + "ms"
            });
            
            css(canvas, {
                transform: rotate(target.rotate, true) + translate(target.translate),
                transitionDuration: duration + "ms",
                transitionDelay: (zoomin ? 0 : delay) + "ms"
            });
            
            // Here is a tricky part...
            //
            // If there is no change in scale or no change in rotation and translation, it means there was actually
            // no delay - because there was no transition on `root` or `canvas` elements.
            // We want to trigger `impress:stepenter` event in the correct moment, so here we compare the current
            // and target values to check if delay should be taken into account.
            //
            // I know that this `if` statement looks scary, but it's pretty simple when you know what is going on
            // - it's simply comparing all the values.
            if ( currentState.scale === target.scale ||
                (currentState.rotate.x === target.rotate.x && currentState.rotate.y === target.rotate.y &&
                 currentState.rotate.z === target.rotate.z && currentState.translate.x === target.translate.x &&
                 currentState.translate.y === target.translate.y && currentState.translate.z === target.translate.z) ) {
                delay = 0;
            }
            
            // store current state
            currentState = target;
            activeStep = el;
            
            // And here is where we trigger `impress:stepenter` event.
            // We simply set up a timeout to fire it taking transition duration (and possible delay) into account.
            //
            // I really wanted to make it in more elegant way. The `transitionend` event seemed to be the best way
            // to do it, but the fact that I'm using transitions on two separate elements and that the `transitionend`
            // event is only triggered when there was a transition (change in the values) caused some bugs and 
            // made the code really complicated, cause I had to handle all the conditions separately. And it still
            // needed a `setTimeout` fallback for the situations when there is no transition at all.
            // So I decided that I'd rather make the code simpler than use shiny new `transitionend`.
            //
            // If you want learn something interesting and see how it was done with `transitionend` go back to
            // version 0.5.2 of impress.js: http://github.com/bartaz/impress.js/blob/0.5.2/js/impress.js
            window.clearTimeout(stepEnterTimeout);
            stepEnterTimeout = window.setTimeout(function() {
                onStepEnter(activeStep);
            }, duration + delay);
            
            return el;
        };
        
        // `prev` API function goes to previous step (in document order)
        var prev = function () {
            var prev = steps.indexOf( activeStep ) - 1;
            prev = prev >= 0 ? steps[ prev ] : steps[ steps.length-1 ];
            
            return goto(prev);
        };
        
        // `next` API function goes to next step (in document order)
        var next = function () {
            var next = steps.indexOf( activeStep ) + 1;
            next = next < steps.length ? steps[ next ] : steps[ 0 ];
            
            return goto(next);
        };
        
        // Adding some useful classes to step elements.
        //
        // All the steps that have not been shown yet are given `future` class.
        // When the step is entered the `future` class is removed and the `present`
        // class is given. When the step is left `present` class is replaced with
        // `past` class.
        //
        // So every step element is always in one of three possible states:
        // `future`, `present` and `past`.
        //
        // There classes can be used in CSS to style different types of steps.
        // For example the `present` class can be used to trigger some custom
        // animations when step is shown.
        root.addEventListener("impress:init", function(){
            // STEP CLASSES
            steps.forEach(function (step) {
                step.classList.add("future");
            });
            
            root.addEventListener("impress:stepenter", function (event) {
                event.target.classList.remove("past");
                event.target.classList.remove("future");
                event.target.classList.add("present");
            }, false);
            
            root.addEventListener("impress:stepleave", function (event) {
                event.target.classList.remove("present");
                event.target.classList.add("past");
            }, false);
            
        }, false);
        
        // Adding hash change support.
        root.addEventListener("impress:init", function(){
            
            // last hash detected
            var lastHash = "";
            
            // `#/step-id` is used instead of `#step-id` to prevent default browser
            // scrolling to element in hash.
            //
            // And it has to be set after animation finishes, because in Chrome it
            // makes transtion laggy.
            // BUG: http://code.google.com/p/chromium/issues/detail?id=62820
            root.addEventListener("impress:stepenter", function (event) {
                window.location.hash = lastHash = "#/" + event.target.id;
            }, false);
            
            window.addEventListener("hashchange", function () {
                // When the step is entered hash in the location is updated
                // (just few lines above from here), so the hash change is 
                // triggered and we would call `goto` again on the same element.
                //
                // To avoid this we store last entered hash and compare.
                if (window.location.hash !== lastHash) {
                    goto( getElementFromHash() );
                }
            }, false);
            
            // START 
            // by selecting step defined in url or first step of the presentation
            goto(getElementFromHash() || steps[0], 0);
        }, false);
        
        body.classList.add("impress-disabled");
        
        // store and return API for given impress.js root element
        return (roots[ "impress-root-" + rootId ] = {
            init: init,
            goto: goto,
            next: next,
            prev: prev
        });

    };
    
    // flag that can be used in JS to check if browser have passed the support test
    impress.supported = impressSupported;
    
})(document, window);

// NAVIGATION EVENTS

// As you can see this part is separate from the impress.js core code.
// It's because these navigation actions only need what impress.js provides with
// its simple API.
//
// In future I think about moving it to make them optional, move to separate files
// and treat more like a 'plugins'.
(function ( document, window ) {
    'use strict';
    
    // throttling function calls, by Remy Sharp
    // http://remysharp.com/2010/07/21/throttling-function-calls/
    var throttle = function (fn, delay) {
        var timer = null;
        return function () {
            var context = this, args = arguments;
            clearTimeout(timer);
            timer = setTimeout(function () {
                fn.apply(context, args);
            }, delay);
        };
    };
    
    // wait for impress.js to be initialized
    document.addEventListener("impress:init", function (event) {
        // Getting API from event data.
        // So you don't event need to know what is the id of the root element
        // or anything. `impress:init` event data gives you everything you 
        // need to control the presentation that was just initialized.
        var api = event.detail.api;
        
        // KEYBOARD NAVIGATION HANDLERS
        
        // Prevent default keydown action when one of supported key is pressed.
        document.addEventListener("keydown", function ( event ) {
            if ( event.keyCode === 9 || ( event.keyCode >= 32 && event.keyCode <= 34 ) || (event.keyCode >= 37 && event.keyCode <= 40) ) {
                event.preventDefault();
            }
        }, false);
        
        // Trigger impress action (next or prev) on keyup.
        
        // Supported keys are:
        // [space] - quite common in presentation software to move forward
        // [up] [right] / [down] [left] - again common and natural addition,
        // [pgdown] / [pgup] - often triggered by remote controllers,
        // [tab] - this one is quite controversial, but the reason it ended up on
        //   this list is quite an interesting story... Remember that strange part
        //   in the impress.js code where window is scrolled to 0,0 on every presentation
        //   step, because sometimes browser scrolls viewport because of the focused element?
        //   Well, the [tab] key by default navigates around focusable elements, so clicking
        //   it very often caused scrolling to focused element and breaking impress.js
        //   positioning. I didn't want to just prevent this default action, so I used [tab]
        //   as another way to moving to next step... And yes, I know that for the sake of
        //   consistency I should add [shift+tab] as opposite action...
        document.addEventListener("keyup", function ( event ) {
            if ( event.keyCode === 9 || ( event.keyCode >= 32 && event.keyCode <= 34 ) || (event.keyCode >= 37 && event.keyCode <= 40) ) {
                switch( event.keyCode ) {
                    case 33: // pg up
                    case 37: // left
                    case 38: // up
                             api.prev();
                             break;
                    case 9:  // tab
                    case 32: // space
                    case 34: // pg down
                    case 39: // right
                    case 40: // down
                             api.next();
                             break;
                }
                
                event.preventDefault();
            }
        }, false);
        
        // delegated handler for clicking on the links to presentation steps
        document.addEventListener("click", function ( event ) {
            // event delegation with "bubbling"
            // check if event target (or any of its parents is a link)
            var target = event.target;
            while ( (target.tagName !== "A") &&
                    (target !== document.documentElement) ) {
                target = target.parentNode;
            }
            
            if ( target.tagName === "A" ) {
                var href = target.getAttribute("href");
                
                // if it's a link to presentation step, target this step
                if ( href && href[0] === '#' ) {
                    target = document.getElementById( href.slice(1) );
                }
            }
            
            if ( api.goto(target) ) {
                event.stopImmediatePropagation();
                event.preventDefault();
            }
        }, false);
        
        // delegated handler for clicking on step elements
        document.addEventListener("click", function ( event ) {
            var target = event.target;
            // find closest step element that is not active
            while ( !(target.classList.contains("step") && !target.classList.contains("active")) &&
                    (target !== document.documentElement) ) {
                target = target.parentNode;
            }
            
            if ( api.goto(target) ) {
                event.preventDefault();
            }
        }, false);
        
        // touch handler to detect taps on the left and right side of the screen
        // based on awesome work of @hakimel: https://github.com/hakimel/reveal.js
        document.addEventListener("touchstart", function ( event ) {
            if (event.touches.length === 1) {
                var x = event.touches[0].clientX,
                    width = window.innerWidth * 0.3,
                    result = null;
                    
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        }, false);
        
        // rescale presentation when window is resized
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    }, false);
        
})(document, window);

// THAT'S ALL FOLKS!
//
// Thanks for reading it all.
// Or thanks for scrolling down and reading the last part.
//
// I've learnt a lot when building impress.js and I hope this code and comments
// will help somebody learn at least some part of it.

index.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=1024">
		<meta name="apple-mobile-web-app-capable" content="yes">
		<meta name="description" content="ERPNext Open Day - June 2013">
		<meta name="author" content="Anand Doshi">
		<title>ERPNext - Open Day - June 2013 - by Anand Doshi</title>
		<link href="main.css" rel="stylesheet">
		<script src="jquery.min.js"></script>
		<script src="jquery.color.min.js"></script>
	</head>
	<body class="impress-not-supported">
		<aside class="fallback-message">
			<p>sorry mate! my presentation is made using impress.js 
				and it seems like this browser doesn't support it. bummer.
				you will miss out on the cool animations. :(</p>
			<p>why don't you try opening this presentation in 
				<b>chrome</b>, <b>safari</b> or <b>firefox</b>? </p>
		</aside>
		<article id="impress">
			<section id="intro" class="step normal" data-y="0">
				<div>
					<h1 class="erpnext"><a href="http://erpnext.com" target="_blank">erpnext</a></h1>
					<div class="open-day">
						<h2>open day</h2>
						<p>may 2013</p>
						<p>by Anand Doshi</p>
					</div>
				</div>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p>use spacebar or arrow keys to navigate</p>
			</section>
			
			<!-- small stuff -->
			<section id="the-small-stuff" class="step green" data-y="800">
				<h1>the small stuff</h1>
			</section>
			<section id="allow-update-stock" class="step green" data-y="1600">
				<p>update stock on submitting Sales Invoice,<br>
					without it being a point-of-sale invoice</p>
				<img src="http://i.imgur.com/3kUmHX3.png">
			</section>
			<section id="price-list-selling-buying" class="step green" data-y="2400">
				<p>each price list can be used either for selling or buying,
					and not both!<br>
					no more confusion, just set it and forget it</p>
				<img src="http://i.imgur.com/Mj05T3E.png">
			</section>
			<section id="partners-list" class="step green" data-y="3200">
				<p><a href="http://erpnext.com/partners" target="_blank">a listing of recognized partners</a></p>
				<img src="http://i.imgur.com/Cgpoqgq.png">
			</section>
			
			<!-- webshop -->
			<section id="webshop" class="step blue" data-y="4000" data-x=0>
				<h1>webshop</h1>
				<p style="margin-top: -20px;">are we there yet?</p>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p>let's take a peek</p>
			</section>
			<section id="item-add-to-cart" class="step blue" data-y="4800">
				<p>so what we have here is a simple add to cart button - let's click it</p>
				<img src="http://i.imgur.com/4aUKeBI.png">				
			</section>
			<section id="login" class="step blue" data-y="4800" data-x="1200">
				<p>if you are not logged in, you will be asked to</p>
				<img src="http://i.imgur.com/UziIO6P.png">
			</section>
			<section id="item-added-to-cart" class="step blue" data-y="4800" data-x="2400">
				<p>once logged in, the item gets added to cart</p>
				<img src="http://i.imgur.com/2da3VKe.png">
			</section>
			<section id="shopping-cart" class="step blue" data-y="4800" data-x="3600">
				<p>here's how the shopping cart looks</p>
				<img src="http://i.imgur.com/Xy2aCCu.png">
			</section>
			
			<!-- webshop - backstage -->
			<section id="lets-go-backstage" class="step blue" data-y="4800" data-x="4800">
				<p>this is all good, yet nothing new</p>
				<div style="width: 50%; margin: auto;"><hr></div>
				<h1>it's the back-stage where things will get interesting</h1>
			</section>
			<section id="backstage-1" class="step blue" data-y="4800" data-x="4800" data-z="-2400">
				<p>inside erpnext, the cart is a quotation with order type = "Shopping Cart"</p>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p>the items get added in the quotation table,<br>
					just like you do it when you enter data, manually</p>
			</section>
			<section id="backstage-2" class="step blue" data-y="5600" data-x="4800" data-z="-2400">
				<p>a price list and a tax template will be selected automatically,<br>
					and applied to this quotation,<br>
					based on the user's billing address</p>
			</section>
			<section id="backstage-3" class="step blue" data-y="6400" data-x="4800" data-z="-2400">
				<p>the user will be able to select a shipping rule,<br>
					like Regular Shipping, Instant Shipping etc.</p>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p>shipping charges will be calculated<br>
					based on the configuration of such shipping rules</p>
			</section>
			<section id="backstage-4" class="step blue" data-y="6400" data-x="4800">
				<p>in sum, we have items, taxes, total amount, addresses</p>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p>a complete quotation, ready to be submitted</p>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p>on placing order / payment, the system will create and submit <br>
					a sales order, a sales invoice and a payment entry</p>
			</section>
			<section id="backstage-5" class="step blue" data-y="6400" data-x="3600">
				<h1>this design fits well</h1>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p>but it took time to get here<br>
					and hence, there are delays in the project</p>
			</section>
			
			<!-- learning -->
			<section id="learning" class="step normal" data-y="6400" data-x="2400">
				<h1>this month, we had our fair share of learning</h1>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p><a href="http://erpnext.com/internet-security" target="_blank">we got hacked!</a><br>
					fortunately, we were able to secure our systems in time</p>
				<p>a hard disk on our server was struggling to keep up;<br>
					so we delved deeper into the domain of software RAID<br>
					and came out enlightened</p>
			</section>
			
			<!-- trials and deprecations -->
			<section id="trials-and-deprecations" class="step normal" data-y="6400" data-x="1200">
				<h1>try often and fail quickly</h1>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p>deprecated shopping cart based on html5 LocalStorage,<br>
					and replaced it with the quotation-based design</p>
				<p>created and killed a quick search widget, within a day<br>
					because it lacked desired features and extensibility</p>
				<p>made a screen-cast, found it redundant, deleted it.<br>
					The upside: I found out how conscious one feels when making a screen-cast</p>
			</section>
			
			<section id="thank-you" class="step normal" data-y="6400">
				<h1>thank you</h1>
				<div style="width: 50%; margin: auto;"><hr></div>
				<p>please share your feedback</p>
			</section>
			
		</article>
		<script src="impress.js"></script>
		<script src="main.js"></script>
	</body>
</html>

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x.isWindow(e)?e:9===e.nodeType&&e.defaultView}x.each({Height:"height",Width:"width"},function(e,t){x.each({padding:"inner"+e,content:t,"":"outer"+e},function(n,r){x.fn[r]=function(r,i){var o=arguments.length&&(n||"boolean"!=typeof r),s=n||(r===!0||i===!0?"margin":"border");return x.access(this,function(t,n,r){var i;return x.isWindow(t)?t.document.documentElement["client"+e]:9===t.nodeType?(i=t.documentElement,Math.max(t.body["scroll"+e],i["scroll"+e],t.body["offset"+e],i["offset"+e],i["client"+e])):r===undefined?x.css(t,n,s):x.style(t,n,r,s)},t,o?r:undefined,o,null)}})}),x.fn.size=function(){return this.length},x.fn.andSelf=x.fn.addBack,"object"==typeof module&&module&&"object"==typeof module.exports?module.exports=x:"function"==typeof define&&define.amd&&define("jquery",[],function(){return x}),"object"==typeof e&&"object"==typeof e.document&&(e.jQuery=e.$=x)})(window);

main.css

@import url(normalize.css);
@import url(http://fonts.googleapis.com/css?family=Source+Sans+Pro:700,400);
@import url(http://fonts.googleapis.com/css?family=Noticia+Text:400,700,400italic);

.fallback-message {
    line-height: 1.3;

    width: 800px;
    padding: 10px;
    margin: auto;

    border: 1px solid #aaa;
    border-radius: 10px;
}

.impress-supported .fallback-message {
    display: none;
}

.impress-enabled .step {
    margin: 0;
    opacity: 0;

    -webkit-transition: opacity 1s;
    -moz-transition:    opacity 1s;
    -ms-transition:     opacity 1s;
    -o-transition:      opacity 1s;
    transition:         opacity 1s;
}

.impress-enabled .step.active { opacity: 1 }

.step {
	width: 1200px;
	margin: auto;
	text-align: center;
}

a {
    color: inherit;
    text-decoration: none;
	border-radius: 5%;
	padding: 5px 20px;

    -webkit-transition: 0.5s;
    -moz-transition:    0.5s;
    -ms-transition:     0.5s;
    -o-transition:      0.5s;
    transition:         0.5s;
}

a:hover,
a:focus {
	background: rgba(0,0,0,0.1);
}

hr {
	color: #aaa;
}

html, body {
	font-family: "Noticia Text", serif;
	font-size: 1.3em;
	text-rendering: optimizeLegibility;
	background-color: #ecf0f1;
}

body::before {
	content: "";
	background-image: url("http://i.imgur.com/IQSyKHY.png");
	position: absolute;
	top: 0;
	bottom: 0;
	right: 0;
	left: 0;
	opacity: 0.9;
}

h1, h2, h3, h4, h5, h6 {
	font-family: "Source Sans Pro", sans-serif;
	letter-spacing: -0.05em;
}

img {
	max-height: 600px;
}

.center {
	text-align: center;
	vertical-align: middle;
}

.erpnext {
	letter-spacing: -10px;
	font-size: 8em;
	margin-top: -0.1em;
	margin-bottom: 0;
	opacity: 0.7;
}

.open-day {
	position: relative; 
	left: 15em;
	top: -2.8em;
	text-align: left;
	font-size: 1.4em;
}

.open-day h2 {
	margin-bottom: 0;
}

.open-day p {
	margin: -0.1em auto;
}

.blue, .green, .normal {
/*	color: #291E00;*/
	color: #8F4C00;
}

h1 {
	color: #52541C;
}

main.js

;(function(){
	"use strict";
	$(document).ready(function() {
		impress().init();
		setup_backgrounds();
	});
	
	var color_map = {
		"normal": "#ecf0f1",
		"green": "#63C700",
		"blue": "#0fc9d7",
	};
	
	var setup_backgrounds = function() {
		$(document).on("impress:stepenter", function(e) {
			var color_class = $("#" + $(e.target).attr("id")).attr("class").split(" ")[1];
			if(color_map[color_class]) {
				$("body").animate({
					backgroundColor: color_map[color_class]
				}, 500);
			}
		});
		
		$(document).on("impress:stepleave", function(e) {
			var color_class = $("#" + $(e.originalEvent.detail.nextStep).attr("id")).attr("class").split(" ")[1];
			if(color_map[color_class]) {
				$("body").animate({
					backgroundColor: color_map[color_class]
				}, 1000);
			}
		});
		
		var color_class = $("#" + window.location.hash.slice(2)).attr("class").split(" ")[1];
		$("body").css({
			backgroundColor: color_map[color_class]
		});
	}
})();

normalize.css

/*! normalize.css v1.1.1 | MIT License | git.io/normalize */

/* ==========================================================================
   HTML5 display definitions
   ========================================================================== */

/**
 * Correct `block` display not defined in IE 6/7/8/9 and Firefox 3.
 */

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
    display: block;
}

/**
 * Correct `inline-block` display not defined in IE 6/7/8/9 and Firefox 3.
 */

audio,
canvas,
video {
    display: inline-block;
    *display: inline;
    *zoom: 1;
}

/**
 * Prevent modern browsers from displaying `audio` without controls.
 * Remove excess height in iOS 5 devices.
 */

audio:not([controls]) {
    display: none;
    height: 0;
}

/**
 * Address styling not present in IE 7/8/9, Firefox 3, and Safari 4.
 * Known issue: no IE 6 support.
 */

[hidden] {
    display: none;
}

/* ==========================================================================
   Base
   ========================================================================== */

/**
 * 1. Prevent system color scheme's background color being used in Firefox, IE,
 *    and Opera.
 * 2. Prevent system color scheme's text color being used in Firefox, IE, and
 *    Opera.
 * 3. Correct text resizing oddly in IE 6/7 when body `font-size` is set using
 *    `em` units.
 * 4. Prevent iOS text size adjust after orientation change, without disabling
 *    user zoom.
 */

html {
    background: #fff; /* 1 */
    color: #000; /* 2 */
    font-size: 100%; /* 3 */
    -webkit-text-size-adjust: 100%; /* 4 */
    -ms-text-size-adjust: 100%; /* 4 */
}

/**
 * Address `font-family` inconsistency between `textarea` and other form
 * elements.
 */

html,
button,
input,
select,
textarea {
    font-family: sans-serif;
}

/**
 * Address margins handled incorrectly in IE 6/7.
 */

body {
    margin: 0;
}

/* ==========================================================================
   Links
   ========================================================================== */

/**
 * Address `outline` inconsistency between Chrome and other browsers.
 */

a:focus {
    outline: thin dotted;
}

/**
 * Improve readability when focused and also mouse hovered in all browsers.
 */

a:active,
a:hover {
    outline: 0;
}

/* ==========================================================================
   Typography
   ========================================================================== */

/**
 * Address font sizes and margins set differently in IE 6/7.
 * Address font sizes within `section` and `article` in Firefox 4+, Safari 5,
 * and Chrome.
 */

h1 {
    font-size: 2em;
    margin: 0.67em 0;
}

h2 {
    font-size: 1.5em;
    margin: 0.83em 0;
}

h3 {
    font-size: 1.17em;
    margin: 1em 0;
}

h4 {
    font-size: 1em;
    margin: 1.33em 0;
}

h5 {
    font-size: 0.83em;
    margin: 1.67em 0;
}

h6 {
    font-size: 0.67em;
    margin: 2.33em 0;
}

/**
 * Address styling not present in IE 7/8/9, Safari 5, and Chrome.
 */

abbr[title] {
    border-bottom: 1px dotted;
}

/**
 * Address style set to `bolder` in Firefox 3+, Safari 4/5, and Chrome.
 */

b,
strong {
    font-weight: bold;
}

blockquote {
    margin: 1em 40px;
}

/**
 * Address styling not present in Safari 5 and Chrome.
 */

dfn {
    font-style: italic;
}

/**
 * Address differences between Firefox and other browsers.
 * Known issue: no IE 6/7 normalization.
 */

hr {
    -moz-box-sizing: content-box;
    box-sizing: content-box;
    height: 0;
}

/**
 * Address styling not present in IE 6/7/8/9.
 */

mark {
    background: #ff0;
    color: #000;
}

/**
 * Address margins set differently in IE 6/7.
 */

p,
pre {
    margin: 1em 0;
}

/**
 * Correct font family set oddly in IE 6, Safari 4/5, and Chrome.
 */

code,
kbd,
pre,
samp {
    font-family: monospace, serif;
    _font-family: 'courier new', monospace;
    font-size: 1em;
}

/**
 * Improve readability of pre-formatted text in all browsers.
 */

pre {
    white-space: pre;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/**
 * Address CSS quotes not supported in IE 6/7.
 */

q {
    quotes: none;
}

/**
 * Address `quotes` property not supported in Safari 4.
 */

q:before,
q:after {
    content: '';
    content: none;
}

/**
 * Address inconsistent and variable font size in all browsers.
 */

small {
    font-size: 80%;
}

/**
 * Prevent `sub` and `sup` affecting `line-height` in all browsers.
 */

sub,
sup {
    font-size: 75%;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
}

sup {
    top: -0.5em;
}

sub {
    bottom: -0.25em;
}

/* ==========================================================================
   Lists
   ========================================================================== */

/**
 * Address margins set differently in IE 6/7.
 */

dl,
menu,
ol,
ul {
    margin: 1em 0;
}

dd {
    margin: 0 0 0 40px;
}

/**
 * Address paddings set differently in IE 6/7.
 */

menu,
ol,
ul {
    padding: 0 0 0 40px;
}

/**
 * Correct list images handled incorrectly in IE 7.
 */

nav ul,
nav ol {
    list-style: none;
    list-style-image: none;
}

/* ==========================================================================
   Embedded content
   ========================================================================== */

/**
 * 1. Remove border when inside `a` element in IE 6/7/8/9 and Firefox 3.
 * 2. Improve image quality when scaled in IE 7.
 */

img {
    border: 0; /* 1 */
    -ms-interpolation-mode: bicubic; /* 2 */
}

/**
 * Correct overflow displayed oddly in IE 9.
 */

svg:not(:root) {
    overflow: hidden;
}

/* ==========================================================================
   Figures
   ========================================================================== */

/**
 * Address margin not present in IE 6/7/8/9, Safari 5, and Opera 11.
 */

figure {
    margin: 0;
}

/* ==========================================================================
   Forms
   ========================================================================== */

/**
 * Correct margin displayed oddly in IE 6/7.
 */

form {
    margin: 0;
}

/**
 * Define consistent border, margin, and padding.
 */

fieldset {
    border: 1px solid #c0c0c0;
    margin: 0 2px;
    padding: 0.35em 0.625em 0.75em;
}

/**
 * 1. Correct color not being inherited in IE 6/7/8/9.
 * 2. Correct text not wrapping in Firefox 3.
 * 3. Correct alignment displayed oddly in IE 6/7.
 */

legend {
    border: 0; /* 1 */
    padding: 0;
    white-space: normal; /* 2 */
    *margin-left: -7px; /* 3 */
}

/**
 * 1. Correct font size not being inherited in all browsers.
 * 2. Address margins set differently in IE 6/7, Firefox 3+, Safari 5,
 *    and Chrome.
 * 3. Improve appearance and consistency in all browsers.
 */

button,
input,
select,
textarea {
    font-size: 100%; /* 1 */
    margin: 0; /* 2 */
    vertical-align: baseline; /* 3 */
    *vertical-align: middle; /* 3 */
}

/**
 * Address Firefox 3+ setting `line-height` on `input` using `!important` in
 * the UA stylesheet.
 */

button,
input {
    line-height: normal;
}

/**
 * Address inconsistent `text-transform` inheritance for `button` and `select`.
 * All other form control elements do not inherit `text-transform` values.
 * Correct `button` style inheritance in Chrome, Safari 5+, and IE 6+.
 * Correct `select` style inheritance in Firefox 4+ and Opera.
 */

button,
select {
    text-transform: none;
}

/**
 * 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
 *    and `video` controls.
 * 2. Correct inability to style clickable `input` types in iOS.
 * 3. Improve usability and consistency of cursor style between image-type
 *    `input` and others.
 * 4. Remove inner spacing in IE 7 without affecting normal text inputs.
 *    Known issue: inner spacing remains in IE 6.
 */

button,
html input[type="button"], /* 1 */
input[type="reset"],
input[type="submit"] {
    -webkit-appearance: button; /* 2 */
    cursor: pointer; /* 3 */
    *overflow: visible;  /* 4 */
}

/**
 * Re-set default cursor for disabled elements.
 */

button[disabled],
html input[disabled] {
    cursor: default;
}

/**
 * 1. Address box sizing set to content-box in IE 8/9.
 * 2. Remove excess padding in IE 8/9.
 * 3. Remove excess padding in IE 7.
 *    Known issue: excess padding remains in IE 6.
 */

input[type="checkbox"],
input[type="radio"] {
    box-sizing: border-box; /* 1 */
    padding: 0; /* 2 */
    *height: 13px; /* 3 */
    *width: 13px; /* 3 */
}

/**
 * 1. Address `appearance` set to `searchfield` in Safari 5 and Chrome.
 * 2. Address `box-sizing` set to `border-box` in Safari 5 and Chrome
 *    (include `-moz` to future-proof).
 */

input[type="search"] {
    -webkit-appearance: textfield; /* 1 */
    -moz-box-sizing: content-box;
    -webkit-box-sizing: content-box; /* 2 */
    box-sizing: content-box;
}

/**
 * Remove inner padding and search cancel button in Safari 5 and Chrome
 * on OS X.
 */

input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-decoration {
    -webkit-appearance: none;
}

/**
 * Remove inner padding and border in Firefox 3+.
 */

button::-moz-focus-inner,
input::-moz-focus-inner {
    border: 0;
    padding: 0;
}

/**
 * 1. Remove default vertical scrollbar in IE 6/7/8/9.
 * 2. Improve readability and alignment in all browsers.
 */

textarea {
    overflow: auto; /* 1 */
    vertical-align: top; /* 2 */
}

/* ==========================================================================
   Tables
   ========================================================================== */

/**
 * Remove most spacing between table cells.
 */

table {
    border-collapse: collapse;
    border-spacing: 0;
}