440 lines
11 KiB
JavaScript
440 lines
11 KiB
JavaScript
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//---------------------------------------------------------------------
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// XXX need to account for scrollbar -- add hysteresis???
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var patchFlexRows =
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function(elems){
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var W = elems[0].parentElement.clientWidth - 2
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var w = 0
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var h
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var row = []
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var top = elems[0].offsetTop
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// NOTE: this will by design skip the last row.
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for(var elem of elems){
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elem.style.height = ''
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elem.style.width = ''
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h = h
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?? elem.offsetHeight
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top = top
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?? elem.offsetTop
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// collect row...
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if(elem.offsetTop == top){
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w += elem.offsetWidth
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row.push(elem)
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// next row...
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} else {
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// NOTE: we are checking which will require a lesser resize
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// the current row or it with the next image...
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var r1 = W / w
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var r2 = W / (w + elem.offsetWidth)
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var expanded_row = 1/r1 < r2
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if(!expanded_row){
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var r = r1
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} else {
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var r = r2
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row.push(elem) }
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// patch the row...
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for(var e of row){
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e.style.height = Math.floor(h * r) + 'px' }
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// prep for next row...
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if(!expanded_row){
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w = elem.offsetWidth
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h = elem.offsetHeight
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top = elem.offsetTop
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row = [elem]
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} else {
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w = 0
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h = null
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top = null
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row = [] }}}}
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var getScrollParent =
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function(elem){
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var parent = elem.parentElement
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while(parent !== document.body
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&& parent.scrollHeight > parent.clientHeight){
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parent = elem.parentElement }
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return parent }
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// XXX also need to check if scrolled under something...
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var isVisible =
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function(elem) {
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const rect = elem.getBoundingClientRect()
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return rect.top >= 0
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&& rect.left >= 0
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&& rect.bottom <= (window.innerHeight
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|| document.documentElement.clientHeight)
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&& rect.right <= (window.innerWidth
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|| document.documentElement.clientWidth) }
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//---------------------------------------------------------------------
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// XXX add home/end, pageup/pagedown...
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var keyboard = {
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ArrowLeft: function(){
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gallery.lightbox.shown ?
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gallery.lightbox.prev()
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: gallery.prev() },
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ArrowRight: function(){
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gallery.lightbox.shown ?
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gallery.lightbox.next()
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: gallery.next() },
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ArrowUp: function(evt){
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evt.preventDefault()
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gallery.lightbox.shown
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|| gallery.up() },
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ArrowDown: function(evt){
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evt.preventDefault()
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gallery.lightbox.shown
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|| gallery.down() },
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Enter: function(){
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gallery.lightbox.toggle() },
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Escape: function(){
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gallery.lightbox.shown
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&& gallery.lightbox.hide() },
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}
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//---------------------------------------------------------------------
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var Gallery = {
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dom: undefined,
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__lightbox: undefined,
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get lightbox(){
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if(this.dom){
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return this.__lightbox
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?? (this.__lightbox = { __proto__: Lightbox }
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.setup(
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this.dom.querySelector('.lightbox'),
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this)) }
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delete this.__lightbox
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return undefined },
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get current(){
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return this.dom.querySelector('img.current') },
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set current(img){
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for(var i of this.dom.querySelectorAll('img.current')){
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i.classList.remove('current') }
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img.classList.add('current')
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img.scrollIntoView({
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behavior: 'smooth',
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block: 'nearest',
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}) },
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getRow: function(img, direction='current'){
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if(['above', 'current', 'below'].includes(img)){
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direction = img
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img = null }
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// get above/below row...
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// XXX these are wastefull...
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if(direction == 'above'){
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var row = this.getRow(img)
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var e = row[0].previousSibling
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while(e && e.tagName != 'IMG'){
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e = e.previousSibling }
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return e ?
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this.getRow(e)
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: this.getRow([...this.dom.querySelectorAll('img')].at(-1))
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} else if(direction == 'below'){
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var row = this.getRow(img)
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var e = row.at(-1).nextSibling
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while(e && e.tagName != 'IMG'){
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e = e.nextSibling }
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return e ?
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this.getRow(e)
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: this.getRow([...this.dom.querySelectorAll('img')][1]) }
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// get current row...
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var cur = img
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?? this.current
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if(cur == null){
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var scroll = getScrollParent(this.dom).scrollTop
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var images = [...this.dom.querySelectorAll('img')].slice(1)
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for(cur of images){
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if(cur.offsetTop >= scroll){
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break } } }
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var top = cur.offsetTop
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var row = []
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var e = cur
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while(e && e.offsetTop == top){
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row.push(e)
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e = e.nextSibling
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while(e && e.tagName != 'IMG'){
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e = e.nextSibling } }
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e = cur
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while(e && e.offsetTop == top){
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e === cur
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e = e.previousSibling
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while(e && e.tagName != 'IMG'){
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e = e.previousSibling } }
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return row },
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getImage: function(img, direction='current'){
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if(['left', 'above', 'current', 'below', 'right'].includes(img)){
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direction = img
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img = null }
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// current...
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if(direction == 'current'){
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return img
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?? this.current
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?? this.getRow(img)
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// above/below...
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} else if(direction == 'above' || direction == 'below'){
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var row = this.getRow(direction)
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var cur = this.current
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?? row[0]
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var c = cur.offsetLeft + cur.offsetWidth/2
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var target
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var min
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for(var img of row){
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var n = img.offsetLeft + img.offsetWidth/2
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var d = Math.abs(n - c)
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min = min ?? d
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if(d <= min){
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min = d
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target = img } }
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// left/right...
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} else {
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var row = this.getRow(img)
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var i = row.indexOf(
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img
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?? this.current
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?? row[0])
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i += direction == 'left' ?
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-1
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: +1
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i = i < 0 ?
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row.length-1
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: i >= row.length-1 ?
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0
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: i
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var target = row[i] }
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return target },
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// XXX cache image list???
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prev: function(){
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var images = [...this.dom.querySelectorAll('img')].slice(1)
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var i = this.current == null ?
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images.length-1
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: images.indexOf(this.current)-1
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i = i < 0 ?
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images.length-1
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: i
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this.current = images[i]
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return this },
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next: function(){
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var images = [...this.dom.querySelectorAll('img')].slice(1)
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var i = this.current == null ?
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0
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: images.indexOf(this.current)+1
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i = i >= images.length ?
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0
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: i
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this.current = images[i]
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return this },
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// navigate images visually...
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left: function(){
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var cur = this.current
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var row = this.getRow(cur)
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var i = row.indexOf(cur) - 1
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this.current = row[i < 0 ?
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row.length-1
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: i]
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return this },
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right: function(){
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var cur = this.current
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var row = this.getRow(cur)
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var i = row.indexOf(cur) + 1
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this.current = row[i >= row.length ?
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0
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: i]
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return this },
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up: function(){
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this.current = this.getImage('above')
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return this },
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down: function(){
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this.current = this.getImage('below')
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return this },
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// XXX
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select: function(){
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},
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show: function(){
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this.lightbox.show()
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return this },
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// XXX
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load: function(urls){
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},
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setup: function(dom){
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var that = this
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this.dom = dom
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this.dom.addEventListener('click', function(evt){
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var target = evt.target
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if(target.tagName == 'IMG'
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// skip images in lightbox...
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&& target.parentElement === that.dom){
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that.current = target
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that.show() } })
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return this },
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}
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//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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// XXX ignore click from blur...
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// XXX might be a good idea to close on click outside the image...
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// XXX esc from context menu closes view...
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var Lightbox = {
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dom: undefined,
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gallery: undefined,
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navigation_deadzone: 100,
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caption_hysteresis: 10,
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cache_count: 1,
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get url(){
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return this.dom.querySelector('img').src },
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set url(url){
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this.dom.querySelector('img').src = url
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// remove preview dir...
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.replace(/\/[0-9]+px\//, '/')
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// cache...
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this.cache_count != 0
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&& this.cache() },
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get shown(){
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return this.dom.style.display == 'block' },
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show: function(url){
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this.url = url
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?? (this.gallery.current
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?? this.gallery.next().current
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?? {}).src
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// set caption...
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this.dom.setAttribute('caption',
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(this.gallery.current
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?? this.gallery.next().current
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?? {})
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.getAttribute('caption')
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?? '')
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this.dom.style.display = 'block'
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return this },
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hide: function(){
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this.dom.style.display = ''
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return this },
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toggle: function(){
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return this.shown ?
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this.hide()
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: this.show() },
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prev: function(){
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this.gallery.prev().show()
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return this },
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next: function(){
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this.gallery.next().show()
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return this },
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__cache: undefined,
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cache: function(){
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var cache = []
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var _cache = this.__cache = []
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var cur = this.gallery.current
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var images = [...this.gallery.dom.querySelectorAll('img')].slice(1)
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var i = images.indexOf(cur)
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var c = this.cache_count ?? 2
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for(var j=i+1; j<=i+c; j++){
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cache.push(j >= images.length ?
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j % images.length
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: j) }
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for(var j=i-1; j>=i-c; j--){
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cache.unshift(j < 0 ?
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images.length+j
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: j) }
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for(i of cache){
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var img = document.createElement('img')
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img.src = images[i].src
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.replace(/\/[0-9]+px\//, '/')
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_cache.push(img) }
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return this },
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setup: function(dom, gallery){
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var that = this
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this.dom = dom
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this.gallery = gallery
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// controls...
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this.dom.querySelector('.close')
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.addEventListener('click', function(evt){
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evt.stopPropagation()
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that.hide() })
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// click...
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var deadzone = this.navigation_deadzone ?? 100
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this.dom
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.addEventListener('click', function(evt){
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// click left/right side of view...
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// NOTE: this is vewport-relative...
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evt.clientX < that.dom.offsetWidth / 2 - deadzone/2
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&& that.prev()
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evt.clientX > that.dom.offsetWidth / 2 + deadzone/2
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&& that.next() })
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// mouseofver...
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var hysteresis = this.caption_hysteresis ?? 10
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this.dom
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.addEventListener('mousemove', function(evt){
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// indicate action...
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if(evt.clientX < that.dom.offsetWidth / 2 - deadzone/2){
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that.dom.classList.contains('clickable')
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|| that.dom.classList.add('clickable')
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} else if( evt.clientX > that.dom.offsetWidth / 2 + deadzone/2){
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that.dom.classList.contains('clickable')
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} else {
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that.dom.classList.contains('clickable')
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&& that.dom.classList.remove('clickable') }
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// show/hide caption...
|
||
|
|
// hysteresis:
|
||
|
|
// +---+-- off
|
||
|
|
// | |
|
||
|
|
// v ^
|
||
|
|
// | |
|
||
|
|
// on -+---+
|
||
|
|
evt.clientY > that.dom.offsetHeight / 2 + hysteresis
|
||
|
|
&& that.dom.classList.add('show-caption')
|
||
|
|
evt.clientY < that.dom.offsetHeight / 2 - hysteresis
|
||
|
|
&& that.dom.classList.remove('show-caption') })
|
||
|
|
return this },
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
|
||
|
|
var setupGallery = function(gallery){
|
||
|
|
return {__proto__: Gallery}
|
||
|
|
.setup(gallery) }
|
||
|
|
|
||
|
|
var setup = function(){
|
||
|
|
patchFlexRows([...document.querySelectorAll('.gallery>img')])
|
||
|
|
|
||
|
|
var galleries = document.body.querySelectorAll('.gallery')
|
||
|
|
for(var gallery of galleries){
|
||
|
|
// XXX this is wrong...
|
||
|
|
window.gallery = setupGallery(gallery) }
|
||
|
|
// keyboard...
|
||
|
|
document.addEventListener('keydown', function(evt){
|
||
|
|
var key = evt.key
|
||
|
|
if(key in keyboard){
|
||
|
|
keyboard[key](evt) } })
|
||
|
|
window.addEventListener('resize', function(){
|
||
|
|
patchFlexRows([...document.querySelectorAll('.gallery>img')]) })
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
// vim:set ts=4 sw=4 :
|