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express the visible range with EventKeys rather than list indices

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This is less ambiguous in case the DOM and the ObservableList would be
out of sync.
This commit is contained in:
Bruno Windels 2021-09-07 17:48:49 +02:00
parent c78a83d398
commit b3cd2a0e03
8 changed files with 48 additions and 22 deletions
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2
src/domain/session/room/ComposerViewModel.js
View File

@ -25,7 +25,7 @@ export class ComposerViewModel extends ViewModel {
}
setReplyingTo(entry) {
const changed = this._replyVM?.internalId !== entry?.asEventKey().toString();
const changed = this._replyVM?.id?.equals(entry?.asEventKey());
if (changed) {
this._replyVM = this.disposeTracked(this._replyVM);
if (entry) {

9
src/domain/session/room/timeline/TimelineViewModel.js
View File

@ -34,6 +34,8 @@ when loading, it just reads events from a sortkey backwards or forwards...
import {TilesCollection} from "./TilesCollection.js";
import {ViewModel} from "../../../ViewModel.js";
export class TimelineViewModel extends ViewModel {
constructor(options) {
super(options);
@ -43,11 +45,8 @@ export class TimelineViewModel extends ViewModel {
this._timeline.loadAtTop(50);
}
setVisibleTileRange(idx, len) {
console.log("setVisibleTileRange", idx, len);
if (idx < 5) {
this._timeline.loadAtTop(10);
}
setVisibleTileRange(startId, endId) {
console.log("setVisibleTileRange", startId, endId);
}
get tiles() {

4
src/domain/session/room/timeline/tiles/SimpleTile.js
View File

@ -40,8 +40,8 @@ export class SimpleTile extends ViewModel {
return false;
}
get internalId() {
return this._entry.asEventKey().toString();
get id() {
return this._entry.asEventKey();
}
get isPending() {

2
src/platform/web/ui/general/ListView.ts
View File

@ -176,7 +176,7 @@ export class ListView<T, V extends UIView> implements UIView {
}
}
protected getChildInstanceByIndex(idx: number): V | undefined {
public getChildInstanceByIndex(idx: number): V | undefined {
return this._childInstances?.[idx];
}
}

41
src/platform/web/ui/session/room/TimelineView.ts
View File

@ -26,7 +26,7 @@ import {AnnouncementView} from "./timeline/AnnouncementView.js";
import {RedactedView} from "./timeline/RedactedView.js";
import {SimpleTile} from "../../../../../domain/session/room/timeline/tiles/SimpleTile.js";
import {TimelineViewModel} from "../../../../../domain/session/room/timeline/TimelineViewModel.js";
import {BaseObservableList as ObservableList} from "../../../../../../observable/list/BaseObservableList.js";
import {BaseObservableList as ObservableList} from "../../../../../observable/list/BaseObservableList.js";
type TileView = GapView | AnnouncementView | TextMessageView |
ImageView | VideoView | FileView | MissingAttachmentView | RedactedView;
@ -59,7 +59,8 @@ function findFirstNodeIndexAtOrBelow(tiles: HTMLElement, top: number, startIndex
return i;
}
}
return -1;
// return first item if nothing matched before
return 0;
}
export class TimelineView extends TemplateView<TimelineViewModel> {
@ -67,20 +68,25 @@ export class TimelineView extends TemplateView<TimelineViewModel> {
private anchoredNode?: HTMLElement;
private anchoredBottom: number = 0;
private stickToBottom: boolean = true;
private tilesView?: TilesListView;
render(t: TemplateBuilder, vm: TimelineViewModel) {
this.tilesView = new TilesListView(vm.tiles, () => this.restoreScrollPosition());
return t.div({className: "Timeline bottom-aligned-scroll", onScroll: () => this.onScroll()}, [
t.view(new TilesListView(vm.tiles, () => this._restoreScrollPosition()))
t.view(this.tilesView)
]);
}
private _restoreScrollPosition() {
private restoreScrollPosition() {
const timeline = this.root() as HTMLElement;
const tiles = timeline.firstElementChild as HTMLElement;
const tiles = this.tilesView!.root() as HTMLElement;
const missingTilesHeight = timeline.clientHeight - tiles.clientHeight;
if (missingTilesHeight > 0) {
tiles.style.setProperty("margin-top", `${missingTilesHeight}px`);
// we don't have enough tiles to fill the viewport, so set all as visible
const len = this.value.tiles.length;
this.updateVisibleRange(0, len - 1);
} else {
tiles.style.removeProperty("margin-top");
if (this.stickToBottom) {
@ -102,21 +108,30 @@ export class TimelineView extends TemplateView<TimelineViewModel> {
private onScroll(): void {
const timeline = this.root() as HTMLElement;
const {scrollHeight, scrollTop, clientHeight} = timeline;
const tiles = timeline.firstElementChild as HTMLElement;
const tiles = this.tilesView!.root() as HTMLElement;
let bottomNodeIndex;
this.stickToBottom = Math.abs(scrollHeight - (scrollTop + clientHeight)) < 5;
if (!this.stickToBottom) {
// save bottom node position
if (this.stickToBottom) {
const len = this.value.tiles.length;
bottomNodeIndex = len - 1;
} else {
const viewportBottom = scrollTop + clientHeight;
const anchoredNodeIndex = findFirstNodeIndexAtOrBelow(tiles, viewportBottom);
let topNodeIndex = findFirstNodeIndexAtOrBelow(tiles, scrollTop, anchoredNodeIndex);
if (topNodeIndex === -1) {
topNodeIndex = 0;
}
this.anchoredNode = tiles.childNodes[anchoredNodeIndex] as HTMLElement;
this.anchoredNode.classList.add("pinned");
this.anchoredBottom = bottom(this.anchoredNode!);
this.value.setVisibleTileRange(topNodeIndex, anchoredNodeIndex - topNodeIndex);
bottomNodeIndex = anchoredNodeIndex;
}
let topNodeIndex = findFirstNodeIndexAtOrBelow(tiles, scrollTop, bottomNodeIndex);
this.updateVisibleRange(topNodeIndex, bottomNodeIndex);
}
private updateVisibleRange(startIndex: number, endIndex: number) {
const firstVisibleChild = this.tilesView!.getChildInstanceByIndex(startIndex);
const lastVisibleChild = this.tilesView!.getChildInstanceByIndex(endIndex);
if (firstVisibleChild && lastVisibleChild) {
this.value.setVisibleTileRange(firstVisibleChild.id, lastVisibleChild.id);
}
}
}

3
src/platform/web/ui/session/room/timeline/AnnouncementView.js
View File

@ -23,4 +23,7 @@ export class AnnouncementView extends TemplateView {
/* This is called by the parent ListView, which just has 1 listener for the whole list */
onClick() {}
/** Used by TimelineView to get the id of a tile when setting the visible range */
get id() { return this.value.id; }
}

3
src/platform/web/ui/session/room/timeline/BaseMessageView.js
View File

@ -86,6 +86,9 @@ export class BaseMessageView extends TemplateView {
}
}
/** Used by TimelineView to get the id of a tile when setting the visible range */
get id() { return this.value.id; }
_toggleMenu(button) {
if (this._menuPopup && this._menuPopup.isOpen) {
this._menuPopup.close();

6
src/platform/web/ui/session/room/timeline/GapView.js
View File

@ -29,4 +29,10 @@ export class GapView extends TemplateView {
t.if(vm => vm.error, t => t.strong(vm => vm.error))
]);
}
/* This is called by the parent ListView, which just has 1 listener for the whole list */
onClick() {}
/** Used by TimelineView to get the id of a tile when setting the visible range */
get id() { return this.value.id; }
}