// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. // See the LICENCE file in the repository root for full licence text. using System; using osu.Framework; 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 osu.Framework.Layout; using osuTK; namespace osu.Game.Screens.Edit.Compose.Components { /// /// A box that displays the drag selection and provides selection events for users to handle. /// public class DragBox : CompositeDrawable, IStateful { protected readonly Action PerformSelection; protected Drawable Box; /// /// Creates a new . /// /// A delegate that performs drag selection. public DragBox(Action performSelection) { PerformSelection = performSelection; RelativeSizeAxes = Axes.Both; AlwaysPresent = true; Alpha = 0; } [BackgroundDependencyLoader] private void load() { InternalChild = Box = CreateBox(); } protected virtual Drawable CreateBox() => new BoxWithBorders(); private RectangleF? dragRectangle; /// /// Handle a forwarded mouse event. /// /// The mouse event. /// Whether the event should be handled and blocking. public virtual bool HandleDrag(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 rec = dragQuad.AABBFloat; dragRectangle = rec; var topLeft = ToLocalSpace(rec.TopLeft); var bottomRight = ToLocalSpace(rec.BottomRight); Box.Position = topLeft; Box.Size = bottomRight - topLeft; return true; } private Visibility state; public Visibility State { get => state; set { if (value == state) return; state = value; this.FadeTo(state == Visibility.Hidden ? 0 : 1, 250, Easing.OutQuint); StateChanged?.Invoke(state); } } protected override void Update() { base.Update(); if (dragRectangle != null) PerformSelection?.Invoke(dragRectangle.Value); } public override void Hide() { State = Visibility.Hidden; dragRectangle = null; } public override void Show() => State = Visibility.Visible; public event Action StateChanged; public class BoxWithBorders : CompositeDrawable { private readonly LayoutValue cache = new LayoutValue(Invalidation.RequiredParentSizeToFit); public BoxWithBorders() { AddLayout(cache); } protected override void Update() { base.Update(); if (!cache.IsValid) { createContent(); cache.Validate(); } } private void createContent() { if (DrawSize == Vector2.Zero) { ClearInternal(); return; } // Make lines the same width independent of display resolution. float lineThickness = DrawWidth > 0 ? DrawWidth / ScreenSpaceDrawQuad.Width * 2 : DrawHeight / ScreenSpaceDrawQuad.Height * 2; Padding = new MarginPadding(-lineThickness / 2); InternalChildren = new Drawable[] { new Box { RelativeSizeAxes = Axes.X, Height = lineThickness, }, new Box { RelativeSizeAxes = Axes.X, Height = lineThickness, Anchor = Anchor.BottomRight, Origin = Anchor.BottomRight, }, new Box { RelativeSizeAxes = Axes.Y, Width = lineThickness, }, new Box { RelativeSizeAxes = Axes.Y, Width = lineThickness, Anchor = Anchor.BottomRight, Origin = Anchor.BottomRight, }, new Box { RelativeSizeAxes = Axes.Both, Alpha = 0.1f } }; } } } }