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116 lines
3.4 KiB
C#
116 lines
3.4 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;
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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, IStateful<Visibility>
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{
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protected readonly Action<RectangleF> PerformSelection;
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protected 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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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 = CreateBox();
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}
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protected virtual Drawable CreateBox() => new Container
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{
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Masking = true,
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BorderColour = Color4.White,
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BorderThickness = SelectionBox.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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private RectangleF? dragRectangle;
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/// <summary>
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/// Handle a forwarded mouse event.
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/// </summary>
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/// <param name="e">The mouse event.</param>
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/// <returns>Whether the event should be handled and blocking.</returns>
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public virtual bool HandleDrag(MouseButtonEvent 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 rec = dragQuad.AABBFloat;
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dragRectangle = rec;
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var topLeft = ToLocalSpace(rec.TopLeft);
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var bottomRight = ToLocalSpace(rec.BottomRight);
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Box.Position = topLeft;
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Box.Size = bottomRight - topLeft;
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return true;
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}
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private Visibility state;
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public Visibility State
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{
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get => state;
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set
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{
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if (value == state) return;
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state = value;
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this.FadeTo(state == Visibility.Hidden ? 0 : 1, 250, Easing.OutQuint);
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StateChanged?.Invoke(state);
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}
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}
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protected override void Update()
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{
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base.Update();
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if (dragRectangle != null)
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PerformSelection?.Invoke(dragRectangle.Value);
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}
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public override void Hide()
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{
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State = Visibility.Hidden;
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dragRectangle = null;
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}
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public override void Show() => State = Visibility.Visible;
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public event Action<Visibility> StateChanged;
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}
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}
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