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SimpleScrollState.ts
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SimpleScrollState.ts
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/*
Copyright 2005 - 2021 Advantage Solutions, s. r. o.
This file is part of ORIGAM (http://www.origam.org).
ORIGAM is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ORIGAM is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ORIGAM. If not, see <http://www.gnu.org/licenses/>.
*/
import { IScrollState } from "./types";
import { action, observable } from "mobx";
export class SimpleScrollState implements IScrollState {
scrollToFunction: ((coords: { scrollLeft?: number; scrollTop?: number }) => void) | undefined;
constructor(scrollTop: number, scrollLeft: number) {
this.scrollTop = scrollTop;
this.scrollLeft = scrollLeft;
}
scrollTo(coords: { scrollLeft?: number; scrollTop?: number }) {
if (this.scrollToFunction) {
this.scrollToFunction(coords);
}
}
scrollBy(coords: {deltaLeft?: number; deltaTop?: number}) {
this.scrollTo({
scrollLeft: coords.deltaLeft !== undefined ? this.scrollLeft + coords.deltaLeft : undefined,
scrollTop: coords.deltaTop !== undefined ? this.scrollTop + coords.deltaTop : undefined
})
}
@observable scrollTop = 0;
@observable scrollLeft = 0;
@action.bound
setScrollOffset(event: any, scrollTop: number, scrollLeft: number): void {
// console.log("scroll event: ", scrollTop, scrollLeft);
this.scrollTop = scrollTop;
this.scrollLeft = scrollLeft;
}
}