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RMidhunSuresh 2021-07-25 19:48:51 +05:30 committed by Bruno Windels
parent d4e923f9de
commit 1a28b4f887
1 changed files with 36 additions and 2 deletions
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38
src/platform/web/ui/general/LazyListView.js
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@ -19,6 +19,11 @@ import {mountView} from "./utils";
import {ListView} from "./ListView";
import {insertAt} from "./utils";
class ScrollDirection {
static get downwards() { return 1; }
static get upwards() { return -1; }
}
class ItemRange {
constructor(topCount, renderCount, bottomCount) {
this.topCount = topCount;
@ -56,6 +61,10 @@ class ItemRange {
);
}
get lastIndex() {
return this.topCount + this.renderCount;
}
totalSize() {
return this.topCount + this.renderCount + this.bottomCount;
}
@ -69,6 +78,23 @@ class ItemRange {
*/
return idx - this.topCount;
}
scrollDirectionTo(range) {
return range.bottomCount < this.bottomCount ? ScrollDirection.downwards : ScrollDirection.upwards;
}
diff(range) {
const diffResult = {};
if (this.scrollDirectionTo(range) === ScrollDirection.downwards) {
diffResult.toRemove = { start: this.topCount, end: range.topCount - 1 };
diffResult.toAdd = { start: this.lastIndex + 1, end: range.lastIndex };
}
else {
diffResult.toRemove = { start: range.lastIndex + 1, end: this.lastIndex };
diffResult.toAdd = { start: range.topCount, end: this.topCount - 1 };
}
return diffResult;
}
}
export class LazyListView extends ListView {
@ -101,6 +127,9 @@ export class LazyListView extends ListView {
// only update render Range if the new range + overflowMargin isn't contained by the old anymore
// or if we are force rendering
if (forceRender || !this._renderRange.contains(intersectRange)) {
console.log("new", renderRange);
console.log("current", this._renderRange);
console.log("diff", this._renderRange.diff(renderRange));
this._renderRange = renderRange;
this._renderElementsInRange();
}
@ -146,13 +175,18 @@ export class LazyListView extends ListView {
return null;
}
_renderElementsInRange() {
_adjustPadding() {
}
_renderElementsInRange(range) {
const { topCount, renderCount, bottomCount } = this._renderRange;
const renderedItems = this._itemsFromList(topCount, topCount + renderCount);
const paddingTop = topCount * this._itemHeight;
const paddingBottom = bottomCount * this._itemHeight;
const renderedItems = this._itemsFromList(topCount, topCount + renderCount);
this._root.style.paddingTop = `${paddingTop}px`;
this._root.style.paddingBottom = `${paddingBottom}px`;
for (const child of this._childInstances) {
this._removeChild(child);
}