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added partial rendering...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2019-06-02 17:36:04 +03:00
parent 1b46c45918
commit 2f5144f2d8
1 changed files with 60 additions and 2 deletions
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62
ui (gen4)/lib/widget/browse2.js
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@ -2071,6 +2071,24 @@ var BaseBrowserPrototype = {
// {
// root: <root-browser>,
// options: <options>,
//
// // Partial render parameters...
// //
// // supported combinations:
// // - from, to
// // - from, count
// // - to, count
// // - around, count
// //
// // NOTE: the only constrain on to/from is that from must be
// // less or equal to to, other than that it's fair game,
// // i.e. overflowing values (<0 or >length) are allowed.
// from: <index> | <query>,
// to: <index> | <query>,
// around: <index> | <query>,
// count: <number>,
//
// ...
// }
//
//
@ -2091,6 +2109,10 @@ var BaseBrowserPrototype = {
// of actual rendering should lay on the renderer methods...
// NOTE: currently options and context are distinguished only via
// the .options attribute...
//
// XXX should partial selection be part of the render or part of .walk(..)???
// XXX figure out a scheme to keep nesting levels consistent when
// doing a partial render...
render: function(options, renderer, context){
context = context || {}
renderer = renderer || this
@ -2101,12 +2123,48 @@ var BaseBrowserPrototype = {
options || {})
context.options = context.options || options
// build range bounds...
var normIndex = function(i){
return (i === undefined || typeof(i) == typeof(123)) ?
i
: this.get(i, function(e, i){ return i }) }.bind(this)
var from = context.from = normIndex(context.from)
var to = context.to = normIndex(context.to)
var around = normIndex(context.around)
var count = context.count < 0 ?
null
: context.count
// complete to/from based on count and/or around...
// NOTE: we do not care about overflow here...
;(from == null && count != null)
&& (from = context.from =
to != null ?
to - count
: around != null ?
around - Math.floor(count/2)
: from)
;(to == null && count != null)
&& (to = context.to =
from != null ?
from + count
: around != null ?
around + Math.ceil(count/2)
: to)
// sanity check...
if(from != null && to != null && to < from){
throw new Error(`.render(..): context.from must be less than `
+`or equal to context.to. (got: from=${from} and to=${to})`) }
// do the walk...
var elems = this.walk(
function(elem, i, path, nested){
return (
// check range...
!((from == null || i >= from)
&& (to == null || i < to)) ?
[]
// inline...
elem == null ?
: elem == null ?
// NOTE: here we are forcing rendering of the
// inline browser/list, i.e. ignoring
// options.skipNested for inline stuff...
@ -2425,7 +2483,7 @@ var BaseBrowserPrototype = {
function(elem){ return elem.value && elem.children },
{iterateCollapsed: true}),
// primary/secondary item actions...
// primary/secondary/ternary? item actions...
// XXX revise default actions...
open: makeItemEventMethod('open',
function(evt, item){},