mirror of
https://github.com/flynx/PortableMag.git
synced 2025-10-31 03:50:16 +00:00
312 lines
7.8 KiB
JavaScript
Executable File
312 lines
7.8 KiB
JavaScript
Executable File
/**********************************************************************
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*
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* XXX add copyright and licence info...
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*
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**********************************************************************/
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var PAGES_IN_RIBBON = 4
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var SNAP_TO_PAGES_IN_RIBBON = false
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var DEFAULT_TRANSITION_DURATION = 200
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var INNERTIA_SCALE = 0.25
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/********************************************************** layout ***/
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var togglePageFitMode = createCSSClassToggler(
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'.viewer',
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'.page-fit-to-viewer',
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function(action){
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if(action == 'on'){
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var n = getPageNumber()
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var scale = getMagazineScale()
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$('.page:not(.no-resize)').width($('.viewer').width()/scale)
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} else {
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var n = getPageNumber()
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$('.page:not(.no-resize)').width('')
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}
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setCurrentPage(n)
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})
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var togglePageView = createCSSClassToggler(
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'.viewer',
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'.full-page-view-mode',
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// XXX make this support transitions...
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function(action){
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var view = $('.viewer')
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var page = $('.page')
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if(action == 'on'){
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var scale = getPageTargetScale(1)
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setMagazineScale(scale)
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unanimated($('.magazine, .viewer'), togglePageFitMode)('on')
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} else {
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unanimated($('.magazine, .viewer'), togglePageFitMode)('off')
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var scale = getPageTargetScale(PAGES_IN_RIBBON)
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setMagazineScale(scale)
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}
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// NOTE: can't disable transitions on this one because ScrollTo
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// uses jQuery animation...
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setCurrentPage()
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})
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/************************************************** event handlers ***/
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function handleClick(evt, data){
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// get page target and select it if it's within a page...
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var target = $(data.orig_event.target)
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target = getPageNumber(
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target.hasClass('page') ? target
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: target.parents('.page'))
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if(target != -1){
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var mag = $('.magazine')
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togglePageView()
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setCurrentPage(target)
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setTransitionDuration(mag, DEFAULT_TRANSITION_DURATION)
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setTransitionEasing(mag, 'ease')
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}
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}
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function makeSwipeHandler(action){
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return function(evt, data){
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// ribbon mode...
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if(isNavigationViewRelative()){
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return handleScrollRelease(evt, data)
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}
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// full page view...
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var mag = $('.magazine')
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setTransitionDuration(mag, DEFAULT_TRANSITION_DURATION)
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setTransitionEasing(mag, 'ease-out')
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action($('.current.page'))
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}
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}
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var handleSwipeLeft = makeSwipeHandler(prevPage)
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var handleSwipeRight = makeSwipeHandler(nextPage)
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// do snap and innertia...
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// NOTE: this will also handle swipeUp/swopeDown as we do not
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// explicitly bind them...
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// XXX restore all the changed values...
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function handleScrollRelease(evt, data){
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// this makes things snap...
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if(SNAP_TO_PAGES_IN_RIBBON || !isNavigationViewRelative()){
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setCurrentPage()
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return
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}
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var speed = data.speed.x
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var pages = $('.page')
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var mag = $('.magazine')
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// innertial scroll...
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// XXX make this generic...
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var t = DEFAULT_TRANSITION_DURATION * (1+Math.abs(speed))
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// XXX this is only horisontal at this point...
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var at = getElementShift(mag).left
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var to = (at + (t*speed*INNERTIA_SCALE))
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var first = getMagazineOffset(pages.first(), null, 'center')
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var last = getMagazineOffset(pages.last(), null, 'center')
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// filter out really small speeds...
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if(Math.abs(speed) > 0.5){
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// check bounds...
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// NOTE: need to cut the distance and time if we are going the
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// hit the bounds...
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if(to > first){
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// trim the time proportionally...
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var _t = t
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t = Math.abs(t * ((at-first)/(at-to)))
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to = first
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setTransitionEasing(mag, 'linear')
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} else if(to < last){
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// trim the time proportionally...
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var _t = t
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t = Math.abs(t * ((at-last)/(at-to)))
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to = last
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setTransitionEasing(mag, 'linear')
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} else {
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setTransitionEasing(mag, 'ease-out')
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}
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setTransitionDuration(mag, t)
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setElementTransform(mag, to)
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// restore defaults...
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// XXX this is a bit dumb at this point...
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// XXX run this as a transition end handler...
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setTimeout(function(){
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setTransitionEasing(mag, 'ease-out')
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setTransitionDuration(mag, DEFAULT_TRANSITION_DURATION)
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}, t+10)
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// check scroll bounds...
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// do not let the user scroll out of view...
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} else {
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if(at > first){
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setTransitionEasing(mag, 'ease-in')
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setTransitionDuration(mag, DEFAULT_TRANSITION_DURATION/2)
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setElementTransform(mag, first)
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} else if(at < last){
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setTransitionEasing(mag, 'ease-in')
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setTransitionDuration(mag, DEFAULT_TRANSITION_DURATION/2)
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setElementTransform(mag, last)
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}
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}
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}
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/********************************************************* helpers ***/
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// XXX make this more acurate...
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// ...should check mode or if we are in a ribbon...
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var NAVIGATION_MODE_THRESHOLD = 0.7
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function isNavigationViewRelative(){
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return getMagazineScale() <= NAVIGATION_MODE_THRESHOLD
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}
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// XXX there is something here that depends on scale that is either not
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// compensated, or is over compensated...
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function getMagazineOffset(page, scale, align){
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if(page == null){
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page = $('.current.page')
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}
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if(scale == null){
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scale = getMagazineScale()
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}
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if(align == null){
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align = getPageAlign(page)
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}
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var mag = $('.magazine')
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// calculate the align offset...
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if(align == 'left'){
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var offset = 0
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} else if(align == 'right'){
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var offset = $('.viewer').width() - page.width()*scale
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// center (default)
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} else {
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var offset = $('.viewer').width()/2 - (page.width()/2)*scale
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}
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// NOTE: this without scaling also represents the inner width of
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// the viewer...
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var w = mag.outerWidth(true)
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// XXX this depends on scale...
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var pos = page.position().left//*scale
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var l = 0
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return -((w - w*scale)/2 + pos) + offset
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}
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function getPageNumber(page){
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// a page is given explicitly, get the next one...
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if(page != null){
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return $('.page').index($(page))
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}
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// get the next page relative to the current...
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if(!isNavigationViewRelative()){
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return $('.page').index($('.current.page'))
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// get the closest page to view center...
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// NOTE: this ignores page aligns and only gets the page who's center
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// is closer to view's center
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} else {
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var scale = getMagazineScale()
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var o = -$($('.magazine')[0]).offset().left - $('.viewer').offset().left
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var W = $('.viewer').width()
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var cur = -1
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var res = $('.page').map(function(i, e){
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e = $(e)
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var l = e.position().left
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var w = e.width()*scale
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return Math.abs((l+(w/2)) - (o+(W/2)))
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}).toArray()
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cur = res.indexOf(Math.min.apply(Math, res))
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return cur
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}
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}
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function getMagazineScale(){
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return getElementScale($('.magazine'))
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}
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function setMagazineScale(scale){
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var mag = $('.magazine')
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var cur = $('.current.page')
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// center-align ribbon view pages...
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var align = isNavigationViewRelative() ? 'center' : null
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var left = getMagazineOffset(cur, scale, align)
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setElementTransform(mag, left, scale)
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return mag
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}
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/********************************************************* actions ***/
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function setCurrentPage(n){
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if(n == null){
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n = getPageNumber()
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}
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var scale = getMagazineScale()
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var l = $('.page').length
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// normalize the number...
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n = n < 0 ? l - n : n
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n = n < -l ? 0 : n
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n = n >= l ? l - 1 : n
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$('.current.page').removeClass('current')
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$($('.page')[n]).addClass('current')
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var cur = $('.current.page')
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// center-align pages in ribbon view...
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var align = isNavigationViewRelative() ? 'center' : null
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var left = getMagazineOffset(cur, null, align)
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setElementTransform($('.magazine'), left, scale)
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return cur
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}
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function nextPage(page){
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setCurrentPage(getPageNumber(page)+1)
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}
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function prevPage(page){
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var n = getPageNumber(page)-1
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n = n < 0 ? 0 : n
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setCurrentPage(n)
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}
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function firstPage(){
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setCurrentPage(0)
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}
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function lastPage(){
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setCurrentPage(-1)
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}
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/*********************************************************************/
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// vim:set ts=4 sw=4 :
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