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fix(virtual-scroll): offset position

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This commit is contained in:
Manu Mtz.-Almeida
2018-02-04 21:16:29 +01:00
parent 6d52b722e4
commit ded672294f
1 changed files with 10 additions and 1 deletions
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11
packages/core/src/components/virtual-scroll/virtual-scroll.tsx
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@ -19,6 +19,7 @@ export class VirtualScroll {
private cells: Cell[] = [];
private virtualDom: VirtualNode[] = [];
private isEnabled = false;
private viewportOffset = 0;
private currentScrollTop = 0;
private indexDirty = 0;
private totalHeight = 0;
@ -153,6 +154,13 @@ export class VirtualScroll {
}
this.dom.read(() => {
let topOffset = 0;
let node = this.el;
while (node !== this.scrollEl) {
topOffset += node.offsetTop;
node = node.parentElement;
}
this.viewportOffset = topOffset;
this.currentScrollTop = this.scrollEl.scrollTop;
});
@ -160,7 +168,8 @@ export class VirtualScroll {
const dirtyIndex = this.indexDirty;
// get visible viewport
const viewport = getViewport(this.currentScrollTop, this.viewportHeight, 100);
const scrollTop = this.currentScrollTop - this.viewportOffset;
const viewport = getViewport(scrollTop, this.viewportHeight, 100);
// compute lazily the height index
const heightIndex = this.getHeightIndex(viewport);