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92 lines
2.8 KiB
C#
92 lines
2.8 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using osu.Framework.Allocation;
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using osu.Framework.Graphics;
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using osu.Framework.Graphics.Containers;
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using osu.Framework.Graphics.Primitives;
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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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{
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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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{
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private readonly Action<RectangleF> performSelection;
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/// <summary>
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/// Invoked when the drag selection has finished.
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/// </summary>
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public event Action DragEnd;
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private Drawable box;
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/// <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>
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public DragBox(Action<RectangleF> performSelection)
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{
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this.performSelection = performSelection;
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RelativeSizeAxes = Axes.Both;
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AlwaysPresent = true;
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Alpha = 0;
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}
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[BackgroundDependencyLoader]
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private void load()
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{
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InternalChild = box = new Container
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{
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Masking = true,
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BorderColour = Color4.White,
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BorderThickness = SelectionHandler.BORDER_RADIUS,
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Child = new Box
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{
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RelativeSizeAxes = Axes.Both,
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Alpha = 0.1f
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}
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};
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}
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protected override bool OnDragStart(DragStartEvent e)
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{
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this.FadeIn(250, Easing.OutQuint);
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return true;
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}
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protected override bool OnDrag(DragEvent e)
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{
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var dragPosition = e.ScreenSpaceMousePosition;
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var dragStartPosition = e.ScreenSpaceMouseDownPosition;
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var dragQuad = new Quad(dragStartPosition.X, dragStartPosition.Y, dragPosition.X - dragStartPosition.X, dragPosition.Y - dragStartPosition.Y);
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// We use AABBFloat instead of RectangleF since it handles negative sizes for us
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var dragRectangle = dragQuad.AABBFloat;
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var topLeft = ToLocalSpace(dragRectangle.TopLeft);
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var bottomRight = ToLocalSpace(dragRectangle.BottomRight);
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box.Position = topLeft;
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box.Size = bottomRight - topLeft;
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performSelection?.Invoke(dragRectangle);
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return true;
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}
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protected override bool OnDragEnd(DragEndEvent e)
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{
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this.FadeOut(250, Easing.OutQuint);
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DragEnd?.Invoke();
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return true;
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}
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}
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}
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