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112 lines
4.1 KiB
C#
112 lines
4.1 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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#nullable disable
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using System.Collections.Generic;
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using System.Linq;
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using JetBrains.Annotations;
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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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namespace osu.Game.Screens.Edit.Compose.Components
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{
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/// <summary>
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/// Represents a display composite containing and managing the visibility state of the selection box's drag handles.
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/// </summary>
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public class SelectionBoxDragHandleContainer : CompositeDrawable
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{
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private Container<SelectionBoxScaleHandle> scaleHandles;
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private Container<SelectionBoxRotationHandle> rotationHandles;
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private readonly List<SelectionBoxDragHandle> allDragHandles = new List<SelectionBoxDragHandle>();
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public new MarginPadding Padding
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{
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get => base.Padding;
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set => base.Padding = value;
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}
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[BackgroundDependencyLoader]
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private void load()
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{
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InternalChildren = new Drawable[]
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{
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scaleHandles = new Container<SelectionBoxScaleHandle>
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{
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RelativeSizeAxes = Axes.Both,
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},
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rotationHandles = new Container<SelectionBoxRotationHandle>
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{
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RelativeSizeAxes = Axes.Both,
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Padding = new MarginPadding(-12.5f),
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},
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};
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}
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public void AddScaleHandle(SelectionBoxScaleHandle handle)
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{
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bindDragHandle(handle);
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scaleHandles.Add(handle);
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}
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public void AddRotationHandle(SelectionBoxRotationHandle handle)
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{
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handle.Alpha = 0;
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handle.AlwaysPresent = true;
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bindDragHandle(handle);
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rotationHandles.Add(handle);
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}
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private void bindDragHandle(SelectionBoxDragHandle handle)
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{
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handle.HoverGained += updateRotationHandlesVisibility;
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handle.HoverLost += updateRotationHandlesVisibility;
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handle.MouseDown += updateRotationHandlesVisibility;
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handle.MouseUp += updateRotationHandlesVisibility;
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allDragHandles.Add(handle);
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}
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private SelectionBoxRotationHandle displayedRotationHandle;
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private SelectionBoxDragHandle activeHandle;
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private void updateRotationHandlesVisibility()
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{
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// if the active handle is a rotation handle and is held or hovered,
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// then no need to perform any updates to the rotation handles visibility.
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if (activeHandle is SelectionBoxRotationHandle && (activeHandle?.IsHeld == true || activeHandle?.IsHovered == true))
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return;
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displayedRotationHandle?.FadeOut(SelectionBoxControl.TRANSFORM_DURATION, Easing.OutQuint);
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displayedRotationHandle = null;
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// if the active handle is not a rotation handle but is held, then keep the rotation handle hidden.
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if (activeHandle?.IsHeld == true)
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return;
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activeHandle = rotationHandles.FirstOrDefault(h => h.IsHeld || h.IsHovered);
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activeHandle ??= allDragHandles.FirstOrDefault(h => h.IsHovered);
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if (activeHandle != null)
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{
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displayedRotationHandle = getCorrespondingRotationHandle(activeHandle, rotationHandles);
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displayedRotationHandle?.FadeIn(SelectionBoxControl.TRANSFORM_DURATION, Easing.OutQuint);
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}
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}
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/// <summary>
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/// Gets the rotation handle corresponding to the given handle.
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/// </summary>
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[CanBeNull]
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private static SelectionBoxRotationHandle getCorrespondingRotationHandle(SelectionBoxDragHandle handle, IEnumerable<SelectionBoxRotationHandle> rotationHandles)
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{
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if (handle is SelectionBoxRotationHandle rotationHandle)
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return rotationHandle;
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return rotationHandles.SingleOrDefault(r => r.Anchor == handle.Anchor);
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}
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}
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}
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