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reader.js
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reader.js
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// READER
//
//
// The full DOM hierarchy created by Reader is:
//
// box
// -> container
// -> pages (the number of page elements is determined by the flipper)
// -> sheaf (basically just sets the margins)
// -> component (an iframe created by the current component)
// -> body (the document.body of the iframe)
// -> page controls
// -> standard controls
// -> overlay
// -> modal/popover controls
//
//
// Options:
//
// flipper: The class of page flipper to use.
//
// panels: The class of panels to use
//
// stylesheet: A string of CSS rules to apply to the contents of each
// component loaded into the reader.
//
// place: A book locus for the page to open to when the reader is
// initialized. (See comments at Book#pageNumberAt for more about
// the locus option).
//
// systemId: the id for root elements of components, defaults to "RS:monocle"
//
Monocle.Reader = function (node, bookData, options, onLoadCallback) {
if (Monocle == this) {
return new Monocle.Reader(node, bookData, options, onLoadCallback);
}
var API = { constructor: Monocle.Reader }
var k = API.constants = API.constructor;
var p = API.properties = {
// Initialization-completed flag.
initialized: false,
// The active book.
book: null,
// DOM graph of factory-generated objects.
graph: {},
// An array of style rules that are automatically applied to every page.
pageStylesheets: [],
// Id applied to the HTML element of each component, can be used to scope
// CSS rules.
systemId: (options ? options.systemId : null) || k.DEFAULT_SYSTEM_ID,
// Prefix for classnames for any created element.
classPrefix: k.DEFAULT_CLASS_PREFIX,
// Registered control objects (see addControl). Hashes of the form:
// {
// control: <control instance>,
// elements: <array of topmost elements created by control>,
// controlType: <standard, page, modal, popover, invisible, etc>
// }
controls: [],
// After the reader has been resized, this resettable timer must expire
// the place is restored.
resizeTimer: null
}
var dom;
// Inspects the browser environment and kicks off preparing the container.
//
function initialize() {
options = options || {}
Monocle.Browser.survey(prepareBox);
}
// Sets up the container and internal elements.
//
function prepareBox() {
var box = node;
if (typeof box == "string") { box = document.getElementById(box); }
dom = API.dom = box.dom = new Monocle.Factory(box, 'box', 0, API);
if (!Monocle.Browser.env.isCompatible()) {
if (dispatchEvent("monocle:incompatible", {}, true)) {
// TODO: Something cheerier? More informative?
box.innerHTML = "Your browser is not compatible with Monocle.";
}
return;
}
dispatchEvent("monocle:initializing");
var bk;
if (bookData) {
bk = new Monocle.Book(bookData);
} else {
bk = Monocle.Book.fromNodes([box.cloneNode(true)]);
}
box.innerHTML = "";
// Make sure the box div is absolutely or relatively positioned.
positionBox();
// Attach the page-flipping gadget.
attachFlipper(options.flipper);
// Create the essential DOM elements.
createReaderElements();
// Clamp page frames to a set of styles that reduce Monocle breakage.
clampStylesheets(options.stylesheet);
primeFrames(options.primeURL, function () {
// Make the reader elements look pretty.
applyStyles();
listen('monocle:componentmodify', persistPageStylesOnComponentChange);
p.flipper.listenForInteraction(options.panels);
setBook(bk, options.place, function () {
p.initialized = true;
if (onLoadCallback) { onLoadCallback(API); }
dispatchEvent("monocle:loaded");
});
});
}
function positionBox() {
var currPosVal;
var box = dom.find('box');
if (document.defaultView) {
var currStyle = document.defaultView.getComputedStyle(box, null);
currPosVal = currStyle.getPropertyValue('position');
} else if (box.currentStyle) {
currPosVal = box.currentStyle.position
}
if (["absolute", "relative"].indexOf(currPosVal) == -1) {
box.style.position = "relative";
}
}
function attachFlipper(flipperClass) {
if (!flipperClass) {
if (!Monocle.Browser.env.supportsColumns) {
flipperClass = Monocle.Flippers.Legacy;
} else if (Monocle.Browser.on.Kindle3) {
flipperClass = Monocle.Flippers.Instant;
}
flipperClass = flipperClass || Monocle.Flippers.Slider;
}
if (!flipperClass) { throw("Flipper not found."); }
p.flipper = new flipperClass(API, null, p.readerOptions);
}
function createReaderElements() {
var cntr = dom.append('div', 'container');
for (var i = 0; i < p.flipper.pageCount; ++i) {
var page = cntr.dom.append('div', 'page', i);
page.style.visibility = "hidden";
page.m = { reader: API, pageIndex: i, place: null }
page.m.sheafDiv = page.dom.append('div', 'sheaf', i);
page.m.activeFrame = page.m.sheafDiv.dom.append('iframe', 'component', i);
page.m.activeFrame.m = { 'pageDiv': page };
page.m.activeFrame.setAttribute('frameBorder', 0);
page.m.activeFrame.setAttribute('scrolling', 'no');
p.flipper.addPage(page);
// BROWSERHACK: hook up the iframe to the touchmonitor if it exists.
Monocle.Events.listenOnIframe(page.m.activeFrame);
}
dom.append('div', 'overlay');
dispatchEvent("monocle:loading");
}
function clampStylesheets(customStylesheet) {
var defCSS = k.DEFAULT_STYLE_RULES;
if (Monocle.Browser.env.floatsIgnoreColumns) {
defCSS.push("html#RS\\:monocle * { float: none !important; }");
}
p.defaultStyles = addPageStyles(defCSS, false);
if (customStylesheet) {
p.initialStyles = addPageStyles(customStylesheet, false);
}
}
// Opens the frame to a particular URL (usually 'about:blank').
//
function primeFrames(url, callback) {
url = url || (Monocle.Browser.on.UIWebView ? "blank.html" : "about:blank");
var pageCount = 0;
var cb = function (evt) {
var frame = evt.target || evt.srcElement;
Monocle.Events.deafen(frame, 'load', cb);
dispatchEvent(
'monocle:frameprimed',
{ frame: frame, pageIndex: pageCount }
);
if ((pageCount += 1) == p.flipper.pageCount) {
Monocle.defer(callback);
}
}
forEachPage(function (page) {
Monocle.Events.listen(page.m.activeFrame, 'load', cb);
page.m.activeFrame.src = url;
});
}
function applyStyles() {
dom.find('container').dom.setStyles(Monocle.Styles.container);
forEachPage(function (page, i) {
page.dom.setStyles(Monocle.Styles.page);
dom.find('sheaf', i).dom.setStyles(Monocle.Styles.sheaf);
var cmpt = dom.find('component', i)
cmpt.dom.setStyles(Monocle.Styles.component);
});
lockFrameWidths();
dom.find('overlay').dom.setStyles(Monocle.Styles.overlay);
dispatchEvent('monocle:styles');
}
function lockingFrameWidths() {
if (!Monocle.Browser.env.relativeIframeExpands) { return; }
for (var i = 0, cmpt; cmpt = dom.find('component', i); ++i) {
cmpt.style.display = "none";
}
}
function lockFrameWidths() {
if (!Monocle.Browser.env.relativeIframeExpands) { return; }
for (var i = 0, cmpt; cmpt = dom.find('component', i); ++i) {
cmpt.style.width = cmpt.parentNode.offsetWidth+"px";
cmpt.style.display = "block";
}
}
// Apply the book, move to a particular place or just the first page, wait
// for everything to complete, then fire the callback.
//
function setBook(bk, place, callback) {
p.book = bk;
var pageCount = 0;
if (typeof callback == 'function') {
var watchers = {
'monocle:componentchange': function (evt) {
dispatchEvent('monocle:firstcomponentchange', evt.m);
return (pageCount += 1) == p.flipper.pageCount;
},
'monocle:turn': function (evt) {
callback();
return true;
}
}
var listener = function (evt) {
if (watchers[evt.type](evt)) { deafen(evt.type, listener); }
}
for (evtType in watchers) { listen(evtType, listener) }
}
p.flipper.moveTo(place || { page: 1 });
}
function getBook() {
return p.book;
}
// Attempts to restore the place we were up to in the book before the
// reader was resized.
//
function resized() {
if (!p.initialized) {
console.warn('Attempt to resize book before initialization.');
}
lockingFrameWidths();
if (!dispatchEvent("monocle:resizing", {}, true)) {
return;
}
clearTimeout(p.resizeTimer);
p.resizeTimer = setTimeout(
function () {
lockFrameWidths();
recalculateDimensions(true);
dispatchEvent("monocle:resize");
},
k.RESIZE_DELAY
);
}
function recalculateDimensions(andRestorePlace) {
if (!p.book) { return; }
dispatchEvent("monocle:recalculating");
var place, locus;
if (andRestorePlace !== false) {
var place = getPlace();
var locus = { percent: place ? place.percentageThrough() : 0 };
}
// Better to use an event? Or chaining consecutively?
forEachPage(function (pageDiv) {
pageDiv.m.activeFrame.m.component.updateDimensions(pageDiv);
});
Monocle.defer(function () {
if (locus) { p.flipper.moveTo(locus); }
dispatchEvent("monocle:recalculated");
});
}
// Returns the current page number in the book.
//
// The pageDiv argument is optional - typically defaults to whatever the
// flipper thinks is the "active" page.
//
function pageNumber(pageDiv) {
var place = getPlace(pageDiv);
return place ? (place.pageNumber() || 1) : 1;
}
// Returns the current "place" in the book -- ie, the page number, chapter
// title, etc.
//
// The pageDiv argument is optional - typically defaults to whatever the
// flipper thinks is the "active" page.
//
function getPlace(pageDiv) {
if (!p.initialized) {
console.warn('Attempt to access place before initialization.');
}
return p.flipper.getPlace(pageDiv);
}
// Moves the current page as specified by the locus. See
// Monocle.Book#pageNumberAt for documentation on the locus argument.
//
// The callback argument is optional.
//
function moveTo(locus, callback) {
if (!p.initialized) {
console.warn('Attempt to move place before initialization.');
}
var fn = callback;
if (!locus.direction) {
dispatchEvent('monocle:jumping', { locus: locus });
fn = function () {
dispatchEvent('monocle:jump', { locus: locus });
if (callback) { callback(); }
}
}
p.flipper.moveTo(locus, fn);
}
// Moves to the relevant element in the relevant component.
//
function skipToChapter(src) {
var locus = p.book.locusOfChapter(src);
if (locus) {
moveTo(locus);
return true;
} else {
dispatchEvent("monocle:notfound", { href: src });
return false;
}
}
// Valid types:
// - standard (an overlay above the pages)
// - page (within the page)
// - modal (overlay where click-away does nothing, for a single control)
// - hud (overlay that multiple controls can share)
// - popover (overlay where click-away removes the ctrl elements)
// - invisible
//
// Options:
// - hidden -- creates and hides the ctrl elements;
// use showControl to show them
//
function addControl(ctrl, cType, options) {
for (var i = 0; i < p.controls.length; ++i) {
if (p.controls[i].control == ctrl) {
console.warn("Already added control: " + ctrl);
return;
}
}
options = options || {};
var ctrlData = {
control: ctrl,
elements: [],
controlType: cType
}
p.controls.push(ctrlData);
var ctrlElem;
var cntr = dom.find('container'), overlay = dom.find('overlay');
if (!cType || cType == "standard") {
ctrlElem = ctrl.createControlElements(cntr);
cntr.appendChild(ctrlElem);
ctrlData.elements.push(ctrlElem);
} else if (cType == "page") {
forEachPage(function (page, i) {
var runner = ctrl.createControlElements(page);
page.appendChild(runner);
ctrlData.elements.push(runner);
});
} else if (cType == "modal" || cType == "popover" || cType == "hud") {
ctrlElem = ctrl.createControlElements(overlay);
overlay.appendChild(ctrlElem);
ctrlData.elements.push(ctrlElem);
ctrlData.usesOverlay = true;
} else if (cType == "invisible") {
if (
typeof(ctrl.createControlElements) == "function" &&
(ctrlElem = ctrl.createControlElements(cntr))
) {
cntr.appendChild(ctrlElem);
ctrlData.elements.push(ctrlElem);
}
} else {
console.warn("Unknown control type: " + cType);
}
for (var i = 0; i < ctrlData.elements.length; ++i) {
Monocle.Styles.applyRules(ctrlData.elements[i], Monocle.Styles.control);
}
if (options.hidden) {
hideControl(ctrl);
} else {
showControl(ctrl);
}
if (typeof ctrl.assignToReader == 'function') {
ctrl.assignToReader(API);
}
return ctrl;
}
function dataForControl(ctrl) {
for (var i = 0; i < p.controls.length; ++i) {
if (p.controls[i].control == ctrl) {
return p.controls[i];
}
}
}
function hideControl(ctrl) {
var controlData = dataForControl(ctrl);
if (!controlData) {
console.warn("No data for control: " + ctrl);
return;
}
if (controlData.hidden) {
return;
}
for (var i = 0; i < controlData.elements.length; ++i) {
controlData.elements[i].style.display = "none";
}
if (controlData.usesOverlay) {
var overlay = dom.find('overlay');
overlay.style.display = "none";
Monocle.Events.deafenForContact(overlay, overlay.listeners);
}
controlData.hidden = true;
if (ctrl.properties) {
ctrl.properties.hidden = true;
}
dispatchEvent('monocle:controlhide', { control: ctrl }, false);
}
function showControl(ctrl) {
var controlData = dataForControl(ctrl);
if (!controlData) {
console.warn("No data for control: " + ctrl);
return false;
}
if (showingControl(ctrl)) {
return false;
}
var overlay = dom.find('overlay');
if (controlData.usesOverlay && controlData.controlType != "hud") {
for (var i = 0, ii = p.controls.length; i < ii; ++i) {
if (p.controls[i].usesOverlay && !p.controls[i].hidden) {
return false;
}
}
overlay.style.display = "block";
}
for (var i = 0; i < controlData.elements.length; ++i) {
controlData.elements[i].style.display = "block";
}
if (controlData.controlType == "popover") {
var onControl = function (evt) {
var obj = evt.target;
do {
if (obj == controlData.elements[0]) { return true; }
} while (obj && (obj = obj.parentNode));
return false;
}
overlay.listeners = Monocle.Events.listenForContact(
overlay,
{
start: function (evt) { if (!onControl(evt)) { hideControl(ctrl); } },
move: function (evt) { if (!onControl(evt)) { evt.preventDefault(); } }
}
);
}
controlData.hidden = false;
if (ctrl.properties) {
ctrl.properties.hidden = false;
}
dispatchEvent('monocle:controlshow', { control: ctrl }, false);
return true;
}
function showingControl(ctrl) {
var controlData = dataForControl(ctrl);
return controlData.hidden == false;
}
function dispatchEvent(evtType, data, cancelable) {
return Monocle.Events.dispatch(dom.find('box'), evtType, data, cancelable);
}
function listen(evtType, fn, useCapture) {
Monocle.Events.listen(dom.find('box'), evtType, fn, useCapture);
}
function deafen(evtType, fn) {
Monocle.Events.deafen(dom.find('box'), evtType, fn);
}
/* PAGE STYLESHEETS */
// API for adding a new stylesheet to all components. styleRules should be
// a string of CSS rules. restorePlace defaults to true.
//
// Returns a sheet index value that can be used with updatePageStyles
// and removePageStyles.
//
function addPageStyles(styleRules, restorePlace) {
return changingStylesheet(function () {
p.pageStylesheets.push(styleRules);
var sheetIndex = p.pageStylesheets.length - 1;
for (var i = 0; i < p.flipper.pageCount; ++i) {
var doc = dom.find('component', i).contentDocument;
addPageStylesheet(doc, sheetIndex);
}
return sheetIndex;
}, restorePlace);
}
// API for updating the styleRules in an existing page stylesheet across
// all components. Takes a sheet index value obtained via addPageStyles.
//
function updatePageStyles(sheetIndex, styleRules, restorePlace) {
return changingStylesheet(function () {
p.pageStylesheets[sheetIndex] = styleRules;
if (typeof styleRules.join == "function") {
styleRules = styleRules.join("\n");
}
for (var i = 0; i < p.flipper.pageCount; ++i) {
var doc = dom.find('component', i).contentDocument;
var styleTag = doc.getElementById('monStylesheet'+sheetIndex);
if (!styleTag) {
console.warn('No such stylesheet: ' + sheetIndex);
return;
}
if (styleTag.styleSheet) {
styleTag.styleSheet.cssText = styleRules;
} else {
styleTag.replaceChild(
doc.createTextNode(styleRules),
styleTag.firstChild
);
}
}
}, restorePlace);
}
// API for removing a page stylesheet from all components. Takes a sheet
// index value obtained via addPageStyles.
//
function removePageStyles(sheetIndex, restorePlace) {
return changingStylesheet(function () {
p.pageStylesheets[sheetIndex] = null;
for (var i = 0; i < p.flipper.pageCount; ++i) {
var doc = dom.find('component', i).contentDocument;
var styleTag = doc.getElementById('monStylesheet'+sheetIndex);
styleTag.parentNode.removeChild(styleTag);
}
}, restorePlace);
}
// Called when a page changes its component. Injects our current page
// stylesheets into the new component.
//
function persistPageStylesOnComponentChange(evt) {
var doc = evt.m['document'];
doc.documentElement.id = p.systemId;
for (var i = 0; i < p.pageStylesheets.length; ++i) {
if (p.pageStylesheets[i]) {
addPageStylesheet(doc, i);
}
}
}
// Wraps all API-based stylesheet changes (add, update, remove) in a
// brace of custom events (stylesheetchanging/stylesheetchange), and
// recalculates component dimensions if specified (default to true).
//
function changingStylesheet(callback, restorePlace) {
restorePlace = (restorePlace === false) ? false : true;
if (restorePlace) {
dispatchEvent("monocle:stylesheetchanging", {});
}
var result = callback();
if (restorePlace) {
recalculateDimensions(true);
Monocle.defer(
function () { dispatchEvent("monocle:stylesheetchange", {}); }
);
} else {
recalculateDimensions(false);
}
return result;
}
// Private method for adding a stylesheet to a component. Used by
// addPageStyles.
//
function addPageStylesheet(doc, sheetIndex) {
var styleRules = p.pageStylesheets[sheetIndex];
if (!styleRules) {
return;
}
var head = doc.getElementsByTagName('head')[0];
if (!head) {
head = doc.createElement('head');
doc.documentElement.appendChild(head);
}
if (typeof styleRules.join == "function") {
styleRules = styleRules.join("\n");
}
var styleTag = doc.createElement('style');
styleTag.type = 'text/css';
styleTag.id = "monStylesheet"+sheetIndex;
if (styleTag.styleSheet) {
styleTag.styleSheet.cssText = styleRules;
} else {
styleTag.appendChild(doc.createTextNode(styleRules));
}
head.appendChild(styleTag);
return styleTag;
}
function visiblePages() {
return p.flipper.visiblePages ? p.flipper.visiblePages() : [dom.find('page')];
}
function forEachPage(callback) {
for (var i = 0, ii = p.flipper.pageCount; i < ii; ++i) {
var page = dom.find('page', i);
callback(page, i);
}
}
API.getBook = getBook;
API.getPlace = getPlace;
API.moveTo = moveTo;
API.skipToChapter = skipToChapter;
API.resized = resized;
API.addControl = addControl;
API.hideControl = hideControl;
API.showControl = showControl;
API.showingControl = showingControl;
API.dispatchEvent = dispatchEvent;
API.listen = listen;
API.deafen = deafen;
API.addPageStyles = addPageStyles;
API.updatePageStyles = updatePageStyles;
API.removePageStyles = removePageStyles;
API.visiblePages = visiblePages;
initialize();
return API;
}
Monocle.Reader.RESIZE_DELAY = 100;
Monocle.Reader.DEFAULT_SYSTEM_ID = 'RS:monocle'
Monocle.Reader.DEFAULT_CLASS_PREFIX = 'monelem_'
Monocle.Reader.DEFAULT_STYLE_RULES = [
"html#RS\\:monocle * {" +
"-webkit-font-smoothing: subpixel-antialiased;" +
"text-rendering: auto !important;" +
"word-wrap: break-word !important;" +
"overflow: visible !important;" +
"}",
"html#RS\\:monocle body {" +
"margin: 0 !important;"+
"border: none !important;"+
"padding: 0 !important;"+
"-webkit-text-size-adjust: none;" +
"}",
"html#RS\\:monocle body * {" +
"max-width: 100% !important;" +
"}",
"html#RS\\:monocle img, html#RS\\:monocle video, html#RS\\:monocle object {" +
"max-height: 95% !important;" +
"height: auto !important;" +
"}"
]
Monocle.pieceLoaded('core/reader');