mirror of
https://github.com/futurepress/epub.js.git
synced 2025-10-03 14:59:18 +02:00
466 lines
No EOL
10 KiB
JavaScript
466 lines
No EOL
10 KiB
JavaScript
EPUBJS.View = function(section, options) {
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this.settings = options || {};
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this.id = "epubjs-view:" + EPUBJS.core.uuid();
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this.displaying = new RSVP.defer();
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this.displayed = this.displaying.promise;
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this.section = section;
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this.index = section.index;
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this.element = document.createElement('div');
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this.element.classList.add("epub-view");
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// this.element.style.minHeight = "100px";
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this.element.style.height = "0px";
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this.element.style.width = "0px";
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this.element.style.overflow = "hidden";
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this.shown = false;
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this.rendered = false;
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//this.width = 0;
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//this.height = 0;
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if(this.settings.axis && this.settings.axis == "horizontal"){
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this.element.style.display = "inline-block";
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} else {
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this.element.style.display = "block";
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}
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};
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EPUBJS.View.prototype.create = function() {
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if(this.iframe) {
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return this.iframe;
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}
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this.iframe = document.createElement('iframe');
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this.iframe.id = this.id;
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this.iframe.scrolling = "no";
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this.iframe.seamless = "seamless";
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// Back up if seamless isn't supported
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this.iframe.style.border = "none";
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this.resizing = true;
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// this.iframe.style.display = "none";
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this.element.style.visibility = "hidden";
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this.iframe.style.visibility = "hidden";
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this.element.appendChild(this.iframe);
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this.rendered = true;
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this.elementBounds = EPUBJS.core.bounds(this.element);
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// if(width || height){
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// this.resize(width, height);
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// } else if(this.width && this.height){
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// this.resize(this.width, this.height);
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// } else {
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// this.iframeBounds = EPUBJS.core.bounds(this.iframe);
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// }
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if(!!("srcdoc" in this.iframe)) {
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this.supportsSrcdoc = true;
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} else {
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this.supportsSrcdoc = false;
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}
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return this.iframe;
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};
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EPUBJS.View.prototype.lock = function(width, height) {
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var elBorders = EPUBJS.core.borders(this.element);
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var iframeBorders;
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if(this.iframe) {
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iframeBorders = EPUBJS.core.borders(this.iframe);
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} else {
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iframeBorders = {width: 0, height: 0};
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}
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if(EPUBJS.core.isNumber(width)){
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this.lockedWidth = width - elBorders.width - iframeBorders.width;
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this.resize(this.lockedWidth, 0);
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}
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if(EPUBJS.core.isNumber(height)){
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this.lockedHeight = height - elBorders.height - iframeBorders.height;
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this.resize(0, this.lockedHeight);
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}
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if(this.shown) {
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if (this.iframe && !this.resizing) {
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this.expand();
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}
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}
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};
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EPUBJS.View.prototype.resize = function(width, height) {
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if(!this.iframe) return;
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if(EPUBJS.core.isNumber(width)){
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this.iframe.style.width = width + "px";
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}
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if(EPUBJS.core.isNumber(height)){
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this.iframe.style.height = height + "px";
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}
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this.iframeBounds = EPUBJS.core.bounds(this.iframe);
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this.reframe(this.iframeBounds.width, this.iframeBounds.height);
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};
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EPUBJS.View.prototype.reframe = function(width, height) {
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var prevBounds;
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if(!this.shown) return;
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if(EPUBJS.core.isNumber(width)){
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this.element.style.width = width + "px";
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}
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if(EPUBJS.core.isNumber(height)){
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this.element.style.height = height + "px";
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}
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prevBounds = this.elementBounds;
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this.elementBounds = EPUBJS.core.bounds(this.element);
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this.trigger("resized", {
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width: this.elementBounds.width,
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height: this.elementBounds.height,
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widthDelta: this.elementBounds.width - prevBounds.width,
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heightDelta: this.elementBounds.height - prevBounds.height,
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});
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};
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EPUBJS.View.prototype.resized = function(e) {
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/*
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if (!this.resizing) {
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if(this.iframe) {
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// this.expand();
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}
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} else {
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this.resizing = false;
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}*/
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};
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EPUBJS.View.prototype.display = function(_request) {
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return this.section.render(_request)
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.then(function(contents){
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return this.load(contents);
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}.bind(this))
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.then(this.displaying.resolve.call(this));
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};
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EPUBJS.View.prototype.load = function(contents) {
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var loading = new RSVP.defer();
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var loaded = loading.promise;
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this.document = this.iframe.contentDocument;
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if(!this.document) {
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loading.reject(new Error("No Document Available"));
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return loaded;
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}
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this.iframe.addEventListener("load", function(event) {
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this.window = this.iframe.contentWindow;
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this.document = this.iframe.contentDocument;
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loading.resolve(this);
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}.bind(this));
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if(this.supportsSrcdoc){
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this.iframe.srcdoc = contents;
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} else {
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this.document.open();
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this.document.write(contents);
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this.document.close();
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}
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return loaded;
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};
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EPUBJS.View.prototype.layout = function(layoutFunc) {
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this.iframe.style.display = "inline-block";
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// Reset Body Styles
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this.document.body.style.margin = "0";
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//this.document.body.style.display = "inline-block";
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//this.document.documentElement.style.width = "auto";
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if(layoutFunc){
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layoutFunc(this);
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}
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this.onLayout(this);
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};
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EPUBJS.View.prototype.onLayout = function(view) {
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// stub
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};
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EPUBJS.View.prototype.listeners = function() {
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/*
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setTimeout(function(){
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this.window.addEventListener("resize", this.resized.bind(this), false);
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}.bind(this), 10); // Wait to listen for resize events
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*/
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// Wait for fonts to load to finish
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// http://dev.w3.org/csswg/css-font-loading/
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// Not implemented fully
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/*
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if(this.document.fonts && this.document.fonts.status === "loading") {
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console.log("fonts unloaded");
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this.document.fonts.onloadingdone = function(){
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console.log("loaded fonts");
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this.expand();
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}.bind(this);
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}
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*/
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if(this.section.properties.indexOf("scripted") > -1){
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this.observer = this.observe(this.document.body);
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}
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this.imageLoadListeners();
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this.mediaQueryListeners();
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};
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/*
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EPUBJS.View.prototype.expand = function(_defer, _count, _func) {
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var bounds;
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var width, height;
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var expanding = _defer || new RSVP.defer();
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var expanded = expanding.promise;
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// var fontsLoading = false;
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// Stop checking for equal height after 10 tries
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var MAX = 10;
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var count = _count || 1;
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var TIMEOUT = 10 * _count;
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// Flag Changes
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this.resizing = true;
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// Check bounds
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bounds = this.document.body.getBoundingClientRect();
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if(!bounds || (bounds.height === 0 && bounds.width === 0)) {
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console.error("View not shown", this);
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// setTimeout(function(){
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// this.expand(expanding, count);
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// }.bind(this), TIMEOUT);
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expanding.resolve();
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return expanded;
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}
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height = this.lockedHeight || bounds.height; //this.document.documentElement.scrollHeight; //window.getComputedStyle?
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width = this.lockedWidth || this.document.documentElement.scrollWidth;
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if(count <= MAX && (this.width != width || this.height != height) && !this.stopExpanding) {
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this.reframe(width, height);
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this.expandTimeout = setTimeout(function(){
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count += 1;
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if(_func){
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_func(this);
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}
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this.expand(expanding, count, _func);
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}.bind(this), TIMEOUT);
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} else {
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this.resizing = false;
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if(this.stopExpanding){
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this.stopExpanding = null;
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}
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expanding.resolve();
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}
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this.width = width;
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this.height = height;
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return expanded;
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};
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*/
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EPUBJS.View.prototype.expand = function() {
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var width = this.lockedWidth;
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var height = this.lockedHeight;
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// Expand Vertically
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if(width && !height) {
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height = this.document.documentElement.scrollHeight;
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}
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// Expand Horizontally
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if(height && !width) {
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width = this.document.body.scrollWidth;
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};
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this.resize(width, height);
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//this.width = width;
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//this.height = height;
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};
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//https://github.com/tylergaw/media-query-events/blob/master/js/mq-events.js
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EPUBJS.View.prototype.mediaQueryListeners = function() {
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var sheets = this.document.styleSheets;
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var mediaChangeHandler = function(m){
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if(m.matches) {
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this.expand();
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}
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}.bind(this);
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for (var i = 0; i < sheets.length; i += 1) {
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var rules = sheets[i].cssRules;
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for (var j = 0; j < rules.length; j += 1) {
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//if (rules[j].constructor === CSSMediaRule) {
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if(rules[j].media){
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var mql = this.window.matchMedia(rules[j].media.mediaText);
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mql.addListener(mediaChangeHandler);
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//mql.onchange = mediaChangeHandler;
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}
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}
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}
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};
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EPUBJS.View.prototype.observe = function(target) {
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var renderer = this;
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// create an observer instance
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var observer = new MutationObserver(function(mutations) {
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renderer.expand();
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// mutations.forEach(function(mutation) {
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// console.log(mutation);
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// });
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});
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// configuration of the observer:
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var config = { attributes: true, childList: true, characterData: true, subtree: true };
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// pass in the target node, as well as the observer options
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observer.observe(target, config);
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return observer;
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};
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// EPUBJS.View.prototype.appendTo = function(element) {
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// this.element = element;
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// this.element.appendChild(this.iframe);
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// };
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//
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// EPUBJS.View.prototype.prependTo = function(element) {
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// this.element = element;
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// element.insertBefore(this.iframe, element.firstChild);
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// };
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EPUBJS.View.prototype.imageLoadListeners = function(target) {
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var images = this.document.body.querySelectorAll("img");
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var img;
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for (var i = 0; i < images.length; i++) {
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img = images[i];
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if (typeof img.naturalWidth !== "undefined" &&
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img.naturalWidth === 0) {
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img.onload = this.expand.bind(this);
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}
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}
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};
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EPUBJS.View.prototype.show = function() {
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var shown = new RSVP.defer();
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this.shown = true;
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this.layout();
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this.listeners();
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this.expand();
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this.element.style.visibility = "visible";
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this.iframe.style.visibility = "visible";
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this.trigger("shown", this);
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this.onShown(this);
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shown.resolve(this);
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return shown.promise;
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};
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EPUBJS.View.prototype.hide = function() {
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// this.iframe.style.display = "none";
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this.element.style.visibility = "hidden";
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this.iframe.style.visibility = "hidden";
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this.stopExpanding = true;
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this.trigger("hidden");
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};
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EPUBJS.View.prototype.position = function() {
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return this.element.getBoundingClientRect();
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};
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EPUBJS.View.prototype.onShown = function(view) {
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// Stub, override with a custom functions
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};
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EPUBJS.View.prototype.bounds = function() {
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if(!this.elementBounds) {
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this.elementBounds = EPUBJS.core.bounds(this.element);
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}
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return this.elementBounds;
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};
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EPUBJS.View.prototype.destroy = function() {
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// Stop observing
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if(this.observer) {
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this.observer.disconnect();
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}
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if(this.iframe){
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this.stopExpanding = true;
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this.element.removeChild(this.iframe);
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this.shown = false;
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this.iframe = null;
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}
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// this.element.style.height = "0px";
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// this.element.style.width = "0px";
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};
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RSVP.EventTarget.mixin(EPUBJS.View.prototype); |