ui/src/frontend/drag/outer_drag_strategy.ts

// Copyright (C) 2021 The Android Open Source Project
//
// 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.
import {DragStrategy} from './drag_strategy';

export class OuterDragStrategy extends DragStrategy {
  private dragStartPx = 0;

  onDrag(x: number) {
    const dragBeginTime = this.timeScale.pxToTime(this.dragStartPx);
    const dragEndTime = this.timeScale.pxToTime(x);
    const tStart = Math.min(dragBeginTime, dragEndTime);
    const tEnd = Math.max(dragBeginTime, dragEndTime);
    super.updateGlobals(tStart, tEnd);
  }

  onDragStart(x: number) {
    this.dragStartPx = x;
  }
}