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osu-lazer/osu.Game/Screens/Edit/Compose/Components/ScrollingDragBox.cs

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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
using osu.Framework.Input.Events;
using osu.Game.Rulesets.UI;
using osu.Game.Rulesets.UI.Scrolling;
namespace osu.Game.Screens.Edit.Compose.Components
{
/// <summary>
/// A <see cref="DragBox"/> that scrolls along with the scrolling playfield.
/// </summary>
public partial class ScrollingDragBox : DragBox
{
public double MinTime { get; private set; }
public double MaxTime { get; private set; }
private double? startTime;
private readonly ScrollingPlayfield playfield;
public ScrollingDragBox(Playfield playfield)
{
this.playfield = playfield as ScrollingPlayfield ?? throw new ArgumentException("Playfield must be of type {nameof(ScrollingPlayfield)} to use this class.", nameof(playfield));
}
public override void HandleDrag(MouseButtonEvent e)
{
base.HandleDrag(e);
startTime ??= playfield.TimeAtScreenSpacePosition(e.ScreenSpaceMouseDownPosition);
double endTime = playfield.TimeAtScreenSpacePosition(e.ScreenSpaceMousePosition);
MinTime = Math.Min(startTime.Value, endTime);
MaxTime = Math.Max(startTime.Value, endTime);
var startPos = ToLocalSpace(playfield.ScreenSpacePositionAtTime(startTime.Value));
var endPos = ToLocalSpace(playfield.ScreenSpacePositionAtTime(endTime));
switch (playfield.ScrollingInfo.Direction.Value)
{
case ScrollingDirection.Up:
case ScrollingDirection.Down:
Box.Y = Math.Min(startPos.Y, endPos.Y);
Box.Height = Math.Max(startPos.Y, endPos.Y) - Box.Y;
break;
case ScrollingDirection.Left:
case ScrollingDirection.Right:
Box.X = Math.Min(startPos.X, endPos.X);
Box.Width = Math.Max(startPos.X, endPos.X) - Box.X;
break;
}
}
public override void Hide()
{
base.Hide();
startTime = null;
}
}
}