listentotheclouds/playbutton.js at master · abergs/listentotheclouds · GitHub

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/* global d3, document */

var playButton = {
    el: document.querySelector(".js-button"),

    states: {
        playing: {
            nextState: "paused",
            iconEl: document.querySelector("#pause-icon")
        },
        paused: {
            nextState: "playing",
            iconEl: document.querySelector("#play-icon")
        }
    },

    animationDuration: 350,

    init: function () {
        this.setInitialState();
        this.replaceUseEl();
        //this.el.addEventListener("click", this.goToNextState.bind(this));
    },

    setInitialState: function () {
        var initialIconRef = this.el.querySelector("use").getAttribute("xlink:href");
        var stateName = this.el.querySelector(initialIconRef).getAttribute("data-state");
        this.setState(stateName);
    },

    replaceUseEl: function () {
        d3.select(this.el.querySelector("use")).remove();
        var x = d3.select(this.el.querySelector("svg"));
        x.append("path")
            .attr("class", "js-icon")
            .attr("d", this.stateIconPath());
    },

    goToState: function (stateName) {
        console.log("called", stateName, this.state.nextState);
        if (this.state.nextState == stateName) {
            this.goToNextState();
        }
    },

    goToNextState: function () {
        this.setState(this.state.nextState);

        d3.select(this.el.querySelector(".js-icon")).transition()
            .duration(this.animationDuration)
            .attr("d", this.stateIconPath());
    },

    setState: function (stateName) {
        this.state = this.states[stateName];
    },

    stateIconPath: function () {
        return this.state.iconEl.getAttribute("d");
    }
};