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

73 lines
2.3 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.Containers;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Graphics.Shapes;
using osu.Framework.Input.Events;
using osuTK.Graphics;
namespace osu.Game.Screens.Edit.Compose.Components
{
/// <summary>
/// A box that displays the drag selection and provides selection events for users to handle.
/// </summary>
public class DragBox : CompositeDrawable
{
private readonly Action<RectangleF> performSelection;
private Drawable box;
/// <summary>
/// Creates a new <see cref="DragBox"/>.
/// </summary>
/// <param name="performSelection">A delegate that performs drag selection.</param>
public DragBox(Action<RectangleF> performSelection)
{
this.performSelection = performSelection;
RelativeSizeAxes = Axes.Both;
AlwaysPresent = true;
Alpha = 0;
}
[BackgroundDependencyLoader]
private void load()
{
InternalChild = box = new Container
{
Masking = true,
BorderColour = Color4.White,
BorderThickness = SelectionHandler.BORDER_RADIUS,
Child = new Box
{
RelativeSizeAxes = Axes.Both,
Alpha = 0.1f
}
};
}
public void UpdateDrag(MouseButtonEvent e)
{
var dragPosition = e.ScreenSpaceMousePosition;
var dragStartPosition = e.ScreenSpaceMouseDownPosition;
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);
}
}
}