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more experimenting...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2017-07-22 01:54:04 +03:00
parent cf1f51bde1
commit 54dcae7f29
1 changed files with 31 additions and 14 deletions
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45
ui (gen4)/experiments/native-scroll-ribbon-infinite.html
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@ -249,7 +249,7 @@ var makeScrollHandler = function(items, make, options){
options = options || {} options = options || {}
var direction = options.direction || 'vertical' var direction = options.direction || 'vertical'
var threshold = options.threshold || 300 //var threshold = options.threshold ||
var _container = options.container || 'this' var _container = options.container || 'this'
// XXX should we do an initial load here??? // XXX should we do an initial load here???
@ -280,6 +280,9 @@ var makeScrollHandler = function(items, make, options){
var elem_size_attr = 'offsetWidth' var elem_size_attr = 'offsetWidth'
} }
// XXX
var threshold = visible_size
var dom_items = container.children var dom_items = container.children
// head limit -- add items to the head... // head limit -- add items to the head...
@ -292,21 +295,24 @@ var makeScrollHandler = function(items, make, options){
// make the item(s)... // make the item(s)...
if(e){ if(e){
// XXX make this direction-agnostic... // XXX need to account for situations where the whole thing is replaced...
var pre = dom_items[0][elem_offset_attr] var c = dom_items[0]
var pre = c[elem_offset_attr]
container.prepend(make(e)) container.prepend(make(e))
// compensate offset for added items... // compensate offset for added items...
// XXX make this direction-agnostic... var d = c[elem_offset_attr] - pre
var post = dom_items[0][elem_offset_attr] // XXX need to do this only if the browser is not compensating...
container[elem_scroll_attr] += pre - post if(direction == 'horizontal'){
this[elem_scroll_attr] += d
}
// remove hidden items from tail... // remove hidden items from tail...
var t = offset + visible_size + threshold var t = offset + visible_size + threshold
;[].slice.call(dom_items) ;[].slice.call(dom_items)
// XXX add threshold / items-to-keep-offscreen limit ... // XXX add threshold / items-to-keep-offscreen limit ...
// XXX make this direction-agnostic... // XXX this is wrong for horizontal scroll...
.filter(function(e){ return e[elem_offset_attr] > t }) .filter(function(e){ return e[elem_offset_attr] > t })
// XXX can we remove these in one go??? // XXX can we remove these in one go???
.forEach(function(e){ e.remove() }) .forEach(function(e){ e.remove() })
@ -322,23 +328,30 @@ var makeScrollHandler = function(items, make, options){
: items[i] : items[i]
if(e){ if(e){
// XXX make this direction-agnostic...
container.append(make(e)) container.append(make(e))
var pre = dom_items[0][elem_offset_attr] //var clone = container.cloneNode(true)
//container.replaceWith(clone)
// XXX need to account for situations where the whole thing is replaced...
var c = dom_items[dom_items.length-1]
var pre = c[elem_offset_attr]
// remove hidden items for head... // remove hidden items for head...
;[].slice.call(dom_items) ;[].slice.call(dom_items)
// XXX add threshold / items-to-keep-offscreen limit ... // XXX add threshold / items-to-keep-offscreen limit ...
// XXX make this direction-agnostic...
.filter(function(e){ return e[elem_offset_attr] + e[elem_size_attr] < offset }) .filter(function(e){ return e[elem_offset_attr] + e[elem_size_attr] < offset })
// XXX can we remove these in one go??? // XXX can we remove these in one go???
.forEach(function(e){ e.remove() }) .forEach(function(e){ e.remove() })
// compensate offset for removed items... // compensate offset for removed items...
// XXX make this direction-agnostic... var d = c[elem_offset_attr] - pre
var post = dom_items[0][elem_offset_attr] // XXX need to do this only if the browser is not compensating...
container[elem_scroll_attr] += pre - post if(direction == 'horizontal'){
this[elem_scroll_attr] += d
}
//container.replaceWith(container)
} }
} }
} }
@ -386,6 +399,7 @@ var setup = function(){
{ {
container: r, container: r,
direction: 'horizontal', direction: 'horizontal',
threshold: 300,
})) }))
return rc return rc
@ -408,7 +422,10 @@ var setup = function(){
.scroll(makeScrollHandler( .scroll(makeScrollHandler(
function(n){ return n >= 0 ? n : undefined }, function(n){ return n >= 0 ? n : undefined },
makeRibbon, makeRibbon,
{ container: ribbon_set, })) {
container: ribbon_set,
threshold: 300,
}))
} }