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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
export default class SelectedFrameHelper {
private frames = 0;
private frameToWidthRatio = 1;
private selectedIndex = 0;
private scanning = false;
constructor(totalFrames: number, totalWidth: number, index?: number) {
this.reset(totalFrames, totalWidth, index);
}
reset(totalFrames: number, totalWidth: number, index?: number) {
this.frames = totalFrames;
this.frameToWidthRatio = totalWidth / this.frames;
if (index != null) {
this.select(index);
}
}
select(index: number) {
this.selectedIndex = index >= this.frames ? this.frames - index : index;
}
toPosition(index: number) {
return index * this.frameToWidthRatio;
}
toIndex(position: number) {
return Math.floor(position / this.frameToWidthRatio);
}
get index(): number {
return this.selectedIndex;
}
get position(): number {
return this.selectedIndex * this.frameToWidthRatio;
}
scan(state: boolean) {
this.scanning = state;
}
get isScanning(): boolean {
return this.scanning;
}
}
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