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osu-lazer/osu.Game/Screens/Edit/Compose/Components/DragBox.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.
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using System;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Graphics.Shapes;
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using osu.Framework.Input.Events;
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using osuTK.Graphics;
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namespace osu.Game.Screens.Edit.Compose.Components
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{
/// <summary>
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/// A box that displays the drag selection and provides selection events for users to handle.
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/// </summary>
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public class DragBox : CompositeDrawable
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{
private readonly Action<RectangleF> performSelection;
/// <summary>
/// Invoked when the drag selection has finished.
/// </summary>
public event Action DragEnd;
private Drawable box;
/// <summary>
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/// Creates a new <see cref="DragBox"/>.
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/// </summary>
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/// <param name="performSelection">A delegate that performs drag selection.</param>
public DragBox(Action<RectangleF> performSelection)
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{
this.performSelection = performSelection;
RelativeSizeAxes = Axes.Both;
AlwaysPresent = true;
Alpha = 0;
}
[BackgroundDependencyLoader]
private void load()
{
InternalChild = box = new Container
{
Masking = true,
BorderColour = Color4.White,
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BorderThickness = SelectionHandler.BORDER_RADIUS,
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Child = new Box
{
RelativeSizeAxes = Axes.Both,
Alpha = 0.1f
}
};
}
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protected override bool OnDragStart(DragStartEvent e)
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{
this.FadeIn(250, Easing.OutQuint);
return true;
}
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protected override bool OnDrag(DragEvent e)
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{
var dragPosition = e.ScreenSpaceMousePosition;
var dragStartPosition = e.ScreenSpaceMouseDownPosition;
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var dragQuad = new Quad(dragStartPosition.X, dragStartPosition.Y, dragPosition.X - dragStartPosition.X, dragPosition.Y - dragStartPosition.Y);
// We use AABBFloat instead of RectangleF since it handles negative sizes for us
var dragRectangle = dragQuad.AABBFloat;
var topLeft = ToLocalSpace(dragRectangle.TopLeft);
var bottomRight = ToLocalSpace(dragRectangle.BottomRight);
box.Position = topLeft;
box.Size = bottomRight - topLeft;
performSelection?.Invoke(dragRectangle);
return true;
}
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protected override bool OnDragEnd(DragEndEvent e)
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{
this.FadeOut(250, Easing.OutQuint);
DragEnd?.Invoke();
return true;
}
}
}