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scroll_view.js
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scroll_view.js
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// Created by Boris Schneiderman.
// Modified by Daniel Weck
// Copyright (c) 2014 Readium Foundation and/or its licensees. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation and/or
// other materials provided with the distribution.
// 3. Neither the name of the organization nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.
define(["../globals", "jquery", "underscore", "eventEmitter", "../models/bookmark_data", "../models/current_pages_info", "../helpers",
"./one_page_view", "../models/page_open_request", "../models/viewer_settings"],
function (Globals, $, _, EventEmitter, BookmarkData, CurrentPagesInfo, Helpers,
OnePageView, PageOpenRequest, ViewerSettings) {
/**
* Renders content inside a scrollable view port
* @param options
* @param isContinuousScroll
* @param reader
* @constructor
*/
var ScrollView = function (options, isContinuousScroll, reader) {
var _DEBUG = false;
//https://github.com/jquery/jquery/commit/2d715940b9b6fdeed005cd006c8bf63951cf7fb2
//https://github.com/jquery/jquery/commit/49833f7795d665ff1d543c4f71f29fca95b567e9
//https://github.com/jquery/jquery/compare/2.1.4...2.2.0
var _jQueryPositionNeedsFix = false; // v2.2.0 only
try {
var vs = $.fn.jquery.split(".");
if (parseInt(vs[0]) == 2 && parseInt(vs[1]) == 2 && parseInt(vs[2]) == 0) {
_jQueryPositionNeedsFix = true;
}
} catch(err) {
console.error(err);
}
$.extend(this, new EventEmitter());
var SCROLL_MARGIN_TO_SHOW_LAST_VISBLE_LINE = 5;
var ITEM_LOAD_SCROLL_BUFFER = 2000;
var ON_SCROLL_TIME_DALAY = 300;
var self = this;
var _$viewport = $(options.$viewport);
var _spine = options.spine;
var _userStyles = options.userStyles;
var _deferredPageRequest;
var _currentPageRequest;
var _$contentFrame;
var _$el;
var _stopTransientViewUpdate = false;
//this flags used to prevent onScroll event triggering pagination changed when internal layout modifications happens
//if we trigger pagination change without reference to the original request that started the change - we brake the
//Media Overlay bechaviyour
//We can't reuse same flag for all of this action because this actions mey happen in parallel
var _isPerformingLayoutModifications = false; //performing asynch actions that may trigger onScroll;
var _isSettingScrollPosition = false; //this happens when we set scroll position based on open element request
var _isLoadingNewSpineItemOnPageRequest = false; //
this.isContinuousScroll = function () {
return isContinuousScroll;
};
this.render = function () {
var template = Helpers.loadTemplate("scrolled_book_frame", {});
_$el = $(template);
_$viewport.append(_$el);
_$contentFrame = $("#scrolled-content-frame", _$el);
_$contentFrame.css("overflow", "");
_$contentFrame.css("overflow-y", "auto");
_$contentFrame.css("overflow-x", "hidden");
_$contentFrame.css("-webkit-overflow-scrolling", "touch");
_$contentFrame.css("width", "100%");
_$contentFrame.css("height", "100%");
_$contentFrame.css("position", "relative");
var settings = reader.viewerSettings();
if (!settings || typeof settings.enableGPUHardwareAccelerationCSS3D === "undefined")
{
//defaults
settings = new ViewerSettings({});
}
if (settings.enableGPUHardwareAccelerationCSS3D) {
// This is a necessary counterpart for the same CSS GPU hardware acceleration trick in one_page_view.js
// This affects the stacking order and re-enables the scrollbar in Safari (works fine in Chrome otherwise)
_$contentFrame.css("transform", "translateZ(0)");
}
// _$contentFrame.css("box-sizing", "border-box");
// _$contentFrame.css("border", "20px solid red");
self.applyStyles();
var lazyScroll = _.debounce(onScroll, ON_SCROLL_TIME_DALAY);
_$contentFrame.on('scroll', function (e) {
lazyScroll(e);
onScrollDirect();
});
return self;
};
function updateLoadedViewsTop(callback, assertScrollPosition) {
if (_stopTransientViewUpdate) {
callback();
return;
}
var viewPage = firstLoadedView();
if (!viewPage) {
callback();
return;
}
var viewPortRange = getVisibleRange(0);
var firstViewRange = getPageViewRange(viewPage);
if ((viewPortRange.top - firstViewRange.bottom) > ITEM_LOAD_SCROLL_BUFFER) {
var scrollPos = scrollTop();
removePageView(viewPage);
scrollTo(scrollPos - (firstViewRange.bottom - firstViewRange.top), undefined);
assertScrollPosition("updateLoadedViewsTop 1");
updateLoadedViewsTop(callback, assertScrollPosition); //recursion
}
else if ((viewPortRange.top - firstViewRange.top) < ITEM_LOAD_SCROLL_BUFFER) {
addToTopOf(viewPage, function (isElementAdded) {
if (isElementAdded) {
assertScrollPosition("updateLoadedViewsTop 2");
updateLoadedViewsTop(callback, assertScrollPosition); //recursion
}
else {
callback();
}
});
}
else {
callback();
}
}
function updateLoadedViewsBottom(callback, assertScrollPosition) {
if (_stopTransientViewUpdate) {
callback();
return;
}
var viewPage = lastLoadedView();
if (!viewPage) {
callback();
return;
}
var viewPortRange = getVisibleRange(0);
var lastViewRange = getPageViewRange(viewPage);
if ((lastViewRange.top - viewPortRange.bottom) > ITEM_LOAD_SCROLL_BUFFER) {
removePageView(viewPage);
assertScrollPosition("updateLoadedViewsBottom 1");
updateLoadedViewsBottom(callback, assertScrollPosition); //recursion
}
else if ((lastViewRange.bottom - viewPortRange.bottom) < ITEM_LOAD_SCROLL_BUFFER) {
addToBottomOf(viewPage, function (newPageLoaded) {
assertScrollPosition("updateLoadedViewsBottom 2");
if (newPageLoaded) {
updateLoadedViewsBottom(callback, assertScrollPosition); //recursion
}
else {
callback();
}
});
}
else {
callback();
}
}
function updateTransientViews(pageView) {
if (!isContinuousScroll) {
return;
}
var scrollPosBefore = undefined;
if (_DEBUG)
{
if (pageView)
{
var offset = pageView.offset();
if (offset) scrollPosBefore = offset.top;
}
}
// This function double-checks whether the browser has shifted the scroll position because of unforeseen rendering issues.
// (this should never happen because we handle scroll adjustments during iframe height resizes explicitely in this code)
var assertScrollPosition = function(msg)
{
if (_DEBUG)
{
if (!scrollPosBefore) return;
var scrollPosAfter = undefined;
var offset = pageView.offset();
if (offset) scrollPosAfter = offset.top;
if (!scrollPosAfter) return;
var diff = scrollPosAfter - scrollPosBefore;
if (Math.abs(diff) > 1)
{
console.debug("@@@@@@@@@@@@@@@ SCROLL ADJUST (" + msg + ") " + diff + " -- " + pageView.currentSpineItem().href);
//_$contentFrame[0].scrollTop = _$contentFrame[0].scrollTop + diff;
}
}
};
_isPerformingLayoutModifications = true;
updateLoadedViewsBottom(function () {
updateLoadedViewsTop(function () {
setTimeout(function () {
_isPerformingLayoutModifications = false;
}, ON_SCROLL_TIME_DALAY + 100);
}, assertScrollPosition);
}, assertScrollPosition);
}
var _mediaOverlaysWasPlayingLastTimeScrollStarted = false;
function onScrollDirect(e)
{
var settings = reader.viewerSettings();
if (!settings.mediaOverlaysPreservePlaybackWhenScroll)
{
if (!_mediaOverlaysWasPlayingLastTimeScrollStarted && reader.isMediaOverlayAvailable())
{
_mediaOverlaysWasPlayingLastTimeScrollStarted = reader.isPlayingMediaOverlay();
if (_mediaOverlaysWasPlayingLastTimeScrollStarted)
{
reader.pauseMediaOverlay();
}
}
}
}
function onScroll(e)
{
if ( !_isPerformingLayoutModifications
&& !_isSettingScrollPosition
&& !_isLoadingNewSpineItemOnPageRequest) {
self.resetCurrentPosition();
updateTransientViews();
onPaginationChanged(self);
_.defer(function() {
if (!_currentPageRequest) {
self.saveCurrentPosition();
}
})
var settings = reader.viewerSettings();
if (!settings.mediaOverlaysPreservePlaybackWhenScroll)
{
if (_mediaOverlaysWasPlayingLastTimeScrollStarted)
{
setTimeout(function()
{
reader.playMediaOverlay();
_mediaOverlaysWasPlayingLastTimeScrollStarted = false;
}, 100);
}
}
}
}
function scrollTo(offset, pageRequest) {
_$contentFrame[0].scrollTop = offset;
if (pageRequest) {
onPaginationChanged(pageRequest.initiator, pageRequest.spineItem, pageRequest.elementId);
}
}
function updatePageViewSizeAndAdjustScroll(pageView)
{
var scrollPos = scrollTop();
var rangeBeforeResize = getPageViewRange(pageView);
updatePageViewSize(pageView);
var rangeAfterResize = getPageViewRange(pageView);
var heightAfter = rangeAfterResize.bottom - rangeAfterResize.top;
var heightBefore = rangeBeforeResize.bottom - rangeBeforeResize.top;
var delta = heightAfter - heightBefore;
if (Math.abs(delta) > 0)
{
if (_DEBUG)
{
console.debug("IMMEDIATE SCROLL ADJUST: " + pageView.currentSpineItem().href + " == " + delta);
}
scrollTo(scrollPos + delta);
}
}
function addToTopOf(topView, callback) {
var prevSpineItem = _spine.prevItem(topView.currentSpineItem(), true);
if (!prevSpineItem) {
callback(false);
return;
}
var tmpView = createPageViewForSpineItem(prevSpineItem, true);
// add to the end first to avoid scrolling during load
var lastView = lastLoadedView();
tmpView.element().insertAfter(lastView.element());
tmpView.loadSpineItem(prevSpineItem, function (success, $iframe, spineItem, isNewlyLoaded, context) {
if (success) {
updatePageViewSize(tmpView);
var range = getPageViewRange(tmpView);
removePageView(tmpView);
var scrollPos = scrollTop();
var newView = createPageViewForSpineItem(prevSpineItem);
var originalHeight = range.bottom - range.top;
newView.setHeight(originalHeight);
// iframe is loaded hidden here
//this.showIFrame();
//===> not necessary here (temporary iframe)
newView.element().insertBefore(topView.element());
scrollPos = scrollPos + originalHeight;
scrollTo(scrollPos, undefined);
newView.loadSpineItem(prevSpineItem, function (success, $iframe, spineItem, isNewlyLoaded, context) {
if (success) {
updatePageViewSizeAndAdjustScroll(newView);
onPageViewLoaded(newView, success, $iframe, spineItem, isNewlyLoaded, context);
callback(success);
// No need for complicated reachStableContentHeight any more
// Remove this
//reachStableContentHeight(0, newView, $iframe[0], spineItem.href, spineItem.isFixedLayout(), spineItem.isFixedLayout() ? newView.meta_width() : 0, "addToTopOf", continueCallback); // //onIFrameLoad called before this callback, so okay.
}
else {
console.error("Unable to open 2 " + prevSpineItem.href);
removePageView(newView);
callback(false);
}
});
}
else {
console.error("Unable to open 1 " + prevSpineItem.href);
removePageView(tmpView);
callback(false);
}
});
}
function updatePageViewSize(pageView) {
if (pageView.currentSpineItem().isFixedLayout()) {
pageView.scaleToWidth(_$contentFrame.width());
}
else {
pageView.resizeIFrameToContent();
}
}
function addToBottomOf(bottomView, callback) {
var nexSpineItem = _spine.nextItem(bottomView.currentSpineItem(), true);
if (!nexSpineItem) {
callback(false);
return;
}
var scrollPos = scrollTop();
var newView = createPageViewForSpineItem(nexSpineItem);
newView.element().insertAfter(bottomView.element());
newView.loadSpineItem(nexSpineItem, function (success, $iframe, spineItem, isNewlyLoaded, context) {
if (success) {
updatePageViewSize(newView);
onPageViewLoaded(newView, success, $iframe, spineItem, isNewlyLoaded, context);
callback(success);
// No need for complicated reachStableContentHeight any more
//reachStableContentHeight(2, newView, $iframe[0], spineItem.href, spineItem.isFixedLayout(), spineItem.isFixedLayout() ? newView.meta_width() : 0, "addToBottomOf", continueCallback); // //onIFrameLoad called before this callback, so okay.
}
else {
console.error("Unable to load " + nexSpineItem.href);
callback(false);
}
});
}
function removeLoadedItems() {
var loadedPageViews = [];
forEachItemView(function (pageView) {
loadedPageViews.push(pageView);
}, false);
for (var i = 0, count = loadedPageViews.length; i < count; i++) {
removePageView(loadedPageViews[i]);
}
}
function removePageView(pageView) {
pageView.onUnload();
pageView.element().remove();
}
function setFrameSizesToRectangle(rectangle) {
_$contentFrame.css("left", rectangle.left);
_$contentFrame.css("top", rectangle.top);
_$contentFrame.css("right", rectangle.right);
_$contentFrame.css("bottom", rectangle.bottom);
}
this.remove = function () {
_$el.remove();
};
this.onViewportResize = function () {
if (!_$contentFrame) {
return;
}
};
this.resetCurrentPosition = function() {
_currentPageRequest = undefined;
};
this.saveCurrentPosition = function() {
// If there's a deferred page request, there's no point in saving the current position
// as it's going to change soon
if (_deferredPageRequest) {
return;
}
var _firstVisibleCfi = self.getFirstVisibleCfi();
var spineItem = _spine.getItemById(_firstVisibleCfi.idref);
if (spineItem) {
_currentPageRequest = new PageOpenRequest(spineItem, self);
_currentPageRequest.setElementCfi(_firstVisibleCfi.contentCFI);
}
};
this.restoreCurrentPosition = function() {
if (_currentPageRequest) {
this.openPageInternal(_currentPageRequest);
}
};
var _viewSettings = undefined;
this.setViewSettings = function (settings, docWillChange) {
_viewSettings = settings;
forEachItemView(function (pageView) {
pageView.setViewSettings(settings, docWillChange);
}, false);
};
function createPageViewForSpineItem(aSpineItem, isTemporaryView) {
options.disablePageTransitions = true; // force
var enableBookStyleOverrides = true;
if (aSpineItem.isFixedLayout()) {
enableBookStyleOverrides = false;
}
var pageView = new OnePageView(
options,
["content-doc-frame"],
enableBookStyleOverrides,
reader);
pageView.on(OnePageView.Events.SPINE_ITEM_OPEN_START, function($iframe, spineItem) {
Globals.logEvent("OnePageView.Events.SPINE_ITEM_OPEN_START", "ON", "scroll_view.js [ " + spineItem.href + " ]");
Globals.logEvent("CONTENT_DOCUMENT_LOAD_START", "EMIT", "scroll_view.js [ " + spineItem.href + " ]");
self.emit(Globals.Events.CONTENT_DOCUMENT_LOAD_START, $iframe, spineItem);
});
pageView.on(Globals.Events.CONTENT_DOCUMENT_UNLOADED, function($iframe, spineItem) {
Globals.logEvent("CONTENT_DOCUMENT_UNLOADED", "ON", "scroll_view.js [ " + spineItem.href + " ]");
self.emit(Globals.Events.CONTENT_DOCUMENT_UNLOADED, $iframe, spineItem);
});
function updatePageViewSizeAndPagination_() {
// Resize the PageView to fit its content and update the pagination
// and the adjacent views
updatePageViewSize(pageView);
onPaginationChanged(self);
updateTransientViews();
if (_currentPageRequest && !_deferredPageRequest) {
self.restoreCurrentPosition();
}
}
var updatePageViewSizeAndPagination = _.debounce(updatePageViewSizeAndPagination_, 100);
// Observe the CONTENT_SIZE_CHANGED from the page view so the ScrollView
// is notified when the size of the content of the view changes, because
// the font or the viewport size has changed
pageView.on(OnePageView.Events.CONTENT_SIZE_CHANGED, function($iframe, spineItem) {
Globals.logEvent("OnePageView.Events.CONTENT_SIZE_CHANGED", "ON", "scroll_view.js [ " + spineItem.href + " ]");
updatePageViewSizeAndPagination();
});
pageView.render();
var docWillChange = true;
if (_viewSettings) pageView.setViewSettings(_viewSettings, docWillChange);
if (!isTemporaryView) {
pageView.element().data("pageView", pageView);
}
if (isContinuousScroll)
{
pageView.decorateIframe();
}
return pageView;
}
function findPageViewForSpineItem(spineItem, reverse) {
var retView = undefined;
forEachItemView(function (pageView) {
if (pageView.currentSpineItem() == spineItem) {
retView = pageView;
//brake the iteration
return false;
}
else {
return true;
}
}, reverse);
return retView;
}
function forEachItemView(func, reverse) {
var pageNodes = _$contentFrame.children();
var count = pageNodes.length;
var iter = reverse ? function(ix) { return ix - 1}
: function(ix) { return ix + 1};
var compare = reverse ? function(ix) { return ix >= 0}
: function(ix) { return ix < count };
var start = reverse ? count - 1 : 0;
for (var i = start; compare(i); i = iter(i)) {
var $element = pageNodes.eq(i);
var curView = $element.data("pageView");
if (curView) {
if (func(curView) === false) {
return;
}
}
}
}
function firstLoadedView() {
var firstView = undefined;
forEachItemView(function (pageView) {
firstView = pageView;
return false;
}, false);
return firstView;
}
function lastLoadedView() {
var lastView = undefined;
forEachItemView(function (pageView) {
lastView = pageView;
return false;
}, true);
return lastView;
}
function onPageViewLoaded(pageView, success, $iframe, spineItem, isNewlyLoaded, context) {
if (success && isNewlyLoaded) {
Globals.logEvent("CONTENT_DOCUMENT_LOADED", "EMIT", "scroll_view.js [ " + spineItem.href + " ]");
self.emit(Globals.Events.CONTENT_DOCUMENT_LOADED, $iframe, spineItem);
}
}
function loadSpineItem(spineItem, callback) {
removeLoadedItems();
var scrollPos = scrollTop();
var loadedView = createPageViewForSpineItem(spineItem);
_$contentFrame.append(loadedView.element());
loadedView.loadSpineItem(spineItem, function (success, $iframe, spineItem, isNewlyLoaded, context) {
if (success) {
updatePageViewSize(loadedView);
onPageViewLoaded(loadedView, success, $iframe, spineItem, isNewlyLoaded, context);
//callback(loadedView);
// No need for complicated reachStableContentHeight any more
//reachStableContentHeight(1, loadedView, $iframe[0], spineItem.href, spineItem.isFixedLayout(), spineItem.isFixedLayout() ? loadedView.meta_width() : 0, "openPage", continueCallback); // //onIFrameLoad called before this callback, so okay.
}
else {
console.error("Unable to load " + spineItem.href);
removePageView(loadedView);
loadedView = undefined;
}
callback(loadedView);
});
}
this.applyStyles = function () {
Helpers.setStyles(_userStyles.getStyles(), _$el.parent());
//because left, top, bottom, right setting ignores padding of parent container
//we have to take it to account manually
var elementMargins = Helpers.Margins.fromElement(_$el);
setFrameSizesToRectangle(elementMargins.padding);
};
this.applyBookStyles = function () {
forEachItemView(function (pageView) {
pageView.applyBookStyles();
}, false);
};
this.openPageInternal = function (pageRequest) {
_stopTransientViewUpdate = true;
//local helper function
var doneLoadingSpineItem = function (pageView, pageRequest) {
_deferredPageRequest = undefined;
openPageViewElement(pageView, pageRequest);
_stopTransientViewUpdate = false;
updateTransientViews(pageView);
};
if (pageRequest.spineItem) {
var pageView = findPageViewForSpineItem(pageRequest.spineItem);
if (pageView) {
doneLoadingSpineItem(pageView, pageRequest);
}
else {
_deferredPageRequest = pageRequest;
_isLoadingNewSpineItemOnPageRequest = true;
loadSpineItem(pageRequest.spineItem, function (pageView) {
setTimeout(function () {
_isLoadingNewSpineItemOnPageRequest = false;
}, ON_SCROLL_TIME_DALAY + 100);
if (pageView && _deferredPageRequest) {
if (pageView.currentSpineItem() === _deferredPageRequest.spineItem) {
doneLoadingSpineItem(pageView, _deferredPageRequest);
}
else { //while we where waiting for load new request come
self.openPage(_deferredPageRequest); //recursion
}
}
else {
onPaginationChanged(pageRequest.initiator, pageRequest.spineItem, pageRequest.elementId);
}
});
}
}
else {
doneLoadingSpineItem(undefined, pageRequest);
}
};
this.openPage = function(pageRequest) {
this.resetCurrentPosition();
_currentPageRequest = pageRequest;
this.openPageInternal(pageRequest);
}
function openPageViewElement(pageView, pageRequest) {
var topOffset = 0;
var pageCount;
var $element;
var sfiNav;
var pageRange;
if (pageRequest.scrollTop !== undefined) {
topOffset = pageRequest.scrollTop;
}
else if (pageRequest.spineItemPageIndex !== undefined) {
var pageIndex;
pageCount = calculatePageCount();
if (pageRequest.spineItemPageIndex < 0) {
pageIndex = 0;
}
else if (pageRequest.spineItemPageIndex >= pageCount) {
pageIndex = pageCount - 1;
}
else {
pageIndex = pageRequest.spineItemPageIndex;
}
topOffset = pageIndex * viewHeight();
}
else if (pageView && pageRequest.elementId) {
pageRange = getPageViewRange(pageView);
sfiNav = pageView.getNavigator();
$element = sfiNav.getElementById(pageRequest.elementId);
if (!$element || !$element.length) {
console.warn("Element id=" + pageRequest.elementId + " not found!");
return;
}
if (isElementVisibleOnScreen(pageView, $element, 60)) {
//TODO refactoring required
// this is artificial call because MO player waits for this event to continue playing.
onPaginationChanged(pageRequest.initiator, pageRequest.spineItem, pageRequest.elementId);
return;
}
var elementRange = getElementRange(pageView, $element);
topOffset = elementRange.top + pageRange.top;
}
else if (pageView && pageRequest.elementCfi) {
pageRange = getPageViewRange(pageView);
sfiNav = pageView.getNavigator();
var domRange = sfiNav.getDomRangeFromRangeCfi(pageRequest.elementCfi);
if (!domRange) {
console.warn("Range for cfi=" + pageRequest.elementCfi + " not found!");
return;
}
var domRangeAsRange = getDomRangeAsRange(pageView, domRange);
if (isRangeIsVisibleOnScreen(domRangeAsRange, 60)) {
//TODO refactoring required
// this is artificial call because MO player waits for this event to continue playing.
onPaginationChanged(pageRequest.initiator, pageRequest.spineItem, pageRequest.elementId);
return;
}
topOffset = domRangeAsRange.top;
}
else if (pageRequest.firstPage) {
topOffset = 0;
}
else if (pageRequest.lastPage) {
pageCount = calculatePageCount();
if (pageCount === 0) {
return;
}
topOffset = scrollHeight() - viewHeight() - 5;
}
else if (pageView) {
pageRange = getPageViewRange(pageView);
topOffset = pageRange.top;
}
else {
topOffset = 0;
}
if (scrollTop() != topOffset) {
_isSettingScrollPosition = true;
scrollTo(topOffset, pageRequest);
setTimeout(function () {
_isSettingScrollPosition = false;
}, ON_SCROLL_TIME_DALAY + 100); //we have to wait more than scroll delay to make sure that we don't react on onScroll
}
else {
onPaginationChanged(pageRequest.initiator, pageRequest.spineItem, pageRequest.elementId);
}
}
function calculatePageCount() {
return Math.ceil(scrollHeight() / viewHeight());
}
function onPaginationChanged(initiator, paginationRequest_spineItem, paginationRequest_elementId) {
Globals.logEvent("InternalEvents.CURRENT_VIEW_PAGINATION_CHANGED", "EMIT", "scroll_view.js");
self.emit(Globals.InternalEvents.CURRENT_VIEW_PAGINATION_CHANGED, {
paginationInfo: self.getPaginationInfo(),
initiator: initiator,
spineItem: paginationRequest_spineItem,
elementId: paginationRequest_elementId
});
}
function scrollTop() {
return _$contentFrame[0].scrollTop;
}
function scrollBottom() {
return scrollHeight() - (scrollTop() + viewHeight());
}
function viewHeight() {
return _$contentFrame.height();
}
function scrollHeight() {
return _$contentFrame[0].scrollHeight;
}
this.openPageNext = function (initiator) {
var pageRequest;
if (scrollBottom() > 0) {
pageRequest = new PageOpenRequest(undefined, initiator);
pageRequest.scrollTop = scrollTop() + Math.min(scrollBottom(), viewHeight() - SCROLL_MARGIN_TO_SHOW_LAST_VISBLE_LINE);
openPageViewElement(undefined, pageRequest);
}
};
this.openPagePrev = function (initiator) {
var pageRequest;
if (scrollTop() > 0) {
pageRequest = new PageOpenRequest(undefined, initiator);
pageRequest.scrollTop = scrollTop() - (viewHeight() - SCROLL_MARGIN_TO_SHOW_LAST_VISBLE_LINE);
if (pageRequest.scrollTop < 0) {
pageRequest.scrollTop = 0;
}
openPageViewElement(undefined, pageRequest);
}
};
function getVisiblePageViews() {
var views = [];
var range = getVisibleRange(-SCROLL_MARGIN_TO_SHOW_LAST_VISBLE_LINE);
forEachItemView(function (pageView) {
if (isPageViewVisibleInRange(pageView, range)) {
views.push(pageView);
}
else if (views.length > 0) {
return false;
}
return true;
}, false);
return views;
}
function getFirstVisiblePageView() {
var visibleViews = getVisiblePageViews();
return visibleViews[0];
}
function isPageViewVisibleInRange(pageView, range) {
var pageViewRange = getPageViewRange(pageView);
return rangeLength(intersectRanges(pageViewRange, range)) > 0;
}
function getPageViewRange(pageView) {
var range = {top: 0, bottom: 0};
var el = pageView.element();
var pos = el.position();
if (_jQueryPositionNeedsFix) {
var offsetParent = el.offsetParent();
pos.top -= offsetParent.scrollTop();
pos.left -= offsetParent.scrollLeft();
}
range.top = pos.top + scrollTop();
range.bottom = range.top + pageView.getCalculatedPageHeight();