1// Copyright (C) 2021 The Android Open Source Project 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14import {TimeScale} from '../../base/time_scale'; 15import {DragStrategy, DragStrategyUpdateTimeFn} from './drag_strategy'; 16 17export class BorderDragStrategy extends DragStrategy { 18 private moveStart = false; 19 20 constructor( 21 map: TimeScale, 22 private pixelBounds: [number, number], 23 updateVizTime: DragStrategyUpdateTimeFn, 24 ) { 25 super(map, updateVizTime); 26 } 27 28 onDrag(x: number) { 29 const moveStartPx = this.moveStart ? x : this.pixelBounds[0]; 30 const moveEndPx = !this.moveStart ? x : this.pixelBounds[1]; 31 const tStart = this.map.pxToHpTime(Math.min(moveStartPx, moveEndPx)); 32 const tEnd = this.map.pxToHpTime(Math.max(moveStartPx, moveEndPx)); 33 if (moveStartPx > moveEndPx) { 34 this.moveStart = !this.moveStart; 35 } 36 super.updateGlobals(tStart, tEnd); 37 this.pixelBounds = [this.map.hpTimeToPx(tStart), this.map.hpTimeToPx(tEnd)]; 38 } 39 40 onDragStart(x: number) { 41 this.moveStart = 42 Math.abs(x - this.pixelBounds[0]) < Math.abs(x - this.pixelBounds[1]); 43 } 44} 45