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osu-lazer/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineDragBox.cs
2021-07-22 15:48:08 +09:00

80 lines
2.7 KiB
C#

// 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.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Graphics.Shapes;
using osu.Framework.Input.Events;
using osu.Framework.Utils;
namespace osu.Game.Screens.Edit.Compose.Components.Timeline
{
public class TimelineDragBox : DragBox
{
// the following values hold the start and end X positions of the drag box in the timeline's local space,
// but with zoom unapplied in order to be able to compensate for positional changes
// while the timeline is being zoomed in/out.
private float? selectionStart;
private float selectionEnd;
[Resolved]
private Timeline timeline { get; set; }
public TimelineDragBox(Action<RectangleF> performSelect)
: base(performSelect)
{
}
protected override Drawable CreateBox() => new Box
{
RelativeSizeAxes = Axes.Y,
Alpha = 0.3f
};
public override bool HandleDrag(MouseButtonEvent e)
{
// The dragbox should only be active if the mouseDownPosition.Y is within this drawable's bounds.
float localY = ToLocalSpace(e.ScreenSpaceMouseDownPosition).Y;
if (DrawRectangle.Top > localY || DrawRectangle.Bottom < localY)
return false;
selectionStart ??= e.MouseDownPosition.X / timeline.CurrentZoom;
// only calculate end when a transition is not in progress to avoid bouncing.
if (Precision.AlmostEquals(timeline.CurrentZoom, timeline.Zoom))
selectionEnd = e.MousePosition.X / timeline.CurrentZoom;
updateDragBoxPosition();
return true;
}
private void updateDragBoxPosition()
{
if (selectionStart == null)
return;
float rescaledStart = selectionStart.Value * timeline.CurrentZoom;
float rescaledEnd = selectionEnd * timeline.CurrentZoom;
Box.X = Math.Min(rescaledStart, rescaledEnd);
Box.Width = Math.Abs(rescaledStart - rescaledEnd);
var boxScreenRect = Box.ScreenSpaceDrawQuad.AABBFloat;
// we don't care about where the hitobjects are vertically. in cases like stacking display, they may be outside the box without this adjustment.
boxScreenRect.Y -= boxScreenRect.Height;
boxScreenRect.Height *= 2;
PerformSelection?.Invoke(boxScreenRect);
}
public override void Hide()
{
base.Hide();
selectionStart = null;
}
}
}