osu-lazer/osu.Game/Rulesets/Edit/Layers/Selection/SelectionBox.cs

// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Graphics.Shapes;
using OpenTK.Graphics;

namespace osu.Game.Rulesets.Edit.Layers.Selection
{
    /// <summary>
    /// A box that represents a drag selection.
    /// </summary>
    public class SelectionBox : VisibilityContainer
    {
        public const float BORDER_RADIUS = 2;

        /// <summary>
        /// Creates a new <see cref="SelectionBox"/>.
        /// </summary>
        public SelectionBox()
        {
            Masking = true;
            BorderColour = Color4.White;
            BorderThickness = BORDER_RADIUS;

            Child = new Box
            {
                RelativeSizeAxes = Axes.Both,
                Alpha = 0.1f
            };
        }

        public void SetDragRectangle(RectangleF rectangle)
        {
            var topLeft = Parent.ToLocalSpace(rectangle.TopLeft);
            var bottomRight = Parent.ToLocalSpace(rectangle.BottomRight);

            Position = topLeft;
            Size = bottomRight - topLeft;
        }

        public override bool DisposeOnDeathRemoval => true;

        protected override void PopIn() => this.FadeIn(250, Easing.OutQuint);
        protected override void PopOut() => this.FadeOut(250, Easing.OutQuint);
    }
}