89 lines
2.5 KiB
TypeScript
89 lines
2.5 KiB
TypeScript
/*
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Copyright 2020 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { TagID } from "./models";
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const TILE_HEIGHT_PX = 44;
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interface ISerializedListLayout {
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numTiles: number;
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}
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export class ListLayout {
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private _n = 0;
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constructor(public readonly tagId: TagID) {
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const serialized = localStorage.getItem(this.key);
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if (serialized) {
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// We don't use the setters as they cause writes.
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const parsed = <ISerializedListLayout>JSON.parse(serialized);
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this._n = parsed.numTiles;
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}
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}
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public get tileHeight(): number {
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return TILE_HEIGHT_PX;
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}
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private get key(): string {
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return `mx_sublist_layout_${this.tagId}_boxed`;
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}
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public get visibleTiles(): number {
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return Math.max(this._n, this.minVisibleTiles);
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}
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public set visibleTiles(v: number) {
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this._n = v;
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localStorage.setItem(this.key, JSON.stringify(this.serialize()));
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}
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public get minVisibleTiles(): number {
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// the .65 comes from the CSS where the show more button is
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// mathematically 65% of a tile when floating.
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return 4.65;
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}
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public calculateTilesToPixelsMin(maxTiles: number, n: number, possiblePadding: number): number {
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// Only apply the padding if we're about to use maxTiles as we need to
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// plan for the padding. If we're using n, the padding is already accounted
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// for by the resizing stuff.
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let padding = 0;
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if (maxTiles < n) {
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padding = possiblePadding;
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}
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return this.tilesToPixels(Math.min(maxTiles, n)) + padding;
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}
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public tilesToPixelsWithPadding(n: number, padding: number): number {
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return this.tilesToPixels(n) + padding;
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}
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public tilesToPixels(n: number): number {
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return n * this.tileHeight;
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}
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public pixelsToTiles(px: number): number {
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return px / this.tileHeight;
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}
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private serialize(): ISerializedListLayout {
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return {
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numTiles: this.visibleTiles,
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};
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}
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}
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