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 '../time_scale'; 15 16import {DragStrategy} from './drag_strategy'; 17 18export class BorderDragStrategy extends DragStrategy { 19 private moveStart = false; 20 21 constructor(timeScale: TimeScale, private pixelBounds: [number, number]) { 22 super(timeScale); 23 } 24 25 onDrag(x: number) { 26 let tStart = 27 this.timeScale.pxToTime(this.moveStart ? x : this.pixelBounds[0]); 28 let tEnd = 29 this.timeScale.pxToTime(!this.moveStart ? x : this.pixelBounds[1]); 30 if (tStart > tEnd) { 31 this.moveStart = !this.moveStart; 32 [tEnd, tStart] = [tStart, tEnd]; 33 } 34 super.updateGlobals(tStart, tEnd); 35 this.pixelBounds = 36 [this.timeScale.timeToPx(tStart), this.timeScale.timeToPx(tEnd)]; 37 } 38 39 onDragStart(x: number) { 40 this.moveStart = 41 Math.abs(x - this.pixelBounds[0]) < Math.abs(x - this.pixelBounds[1]); 42 } 43}