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osu-lazer/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineSelectionHandler.cs
2022-11-27 00:00:27 +09:00

120 lines
4.6 KiB
C#

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
#nullable disable
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using JetBrains.Annotations;
using osu.Framework.Input.Events;
using osu.Game.Input.Bindings;
using osu.Game.Rulesets.Edit;
using osu.Game.Rulesets.Objects;
using osuTK.Input;
namespace osu.Game.Screens.Edit.Compose.Components.Timeline
{
internal partial class TimelineSelectionHandler : EditorSelectionHandler
{
// for now we always allow movement. snapping is provided by the Timeline's "distance" snap implementation
public override bool HandleMovement(MoveSelectionEvent<HitObject> moveEvent) => true;
public override bool OnPressed(KeyBindingPressEvent<GlobalAction> e)
{
switch (e.Action)
{
case GlobalAction.EditorNudgeLeft:
nudgeSelection(-1);
return true;
case GlobalAction.EditorNudgeRight:
nudgeSelection(1);
return true;
}
return base.OnPressed(e);
}
/// <summary>
/// Nudge the current selection by the specified multiple of beat divisor lengths,
/// based on the timing at the first object in the selection.
/// </summary>
/// <param name="amount">The direction and count of beat divisor lengths to adjust.</param>
private void nudgeSelection(int amount)
{
var selected = EditorBeatmap.SelectedHitObjects;
if (selected.Count == 0)
return;
var timingPoint = EditorBeatmap.ControlPointInfo.TimingPointAt(selected.First().StartTime);
double adjustment = timingPoint.BeatLength / EditorBeatmap.BeatDivisor * amount;
EditorBeatmap.PerformOnSelection(h =>
{
h.StartTime += adjustment;
EditorBeatmap.Update(h);
});
}
/// <summary>
/// The "pivot" object, used in range selection mode.
/// When in range selection, the range to select is determined by the pivot object
/// (last existing object interacted with prior to holding down Shift)
/// and by the object clicked last when Shift was pressed.
/// </summary>
[CanBeNull]
private HitObject pivot;
internal override bool MouseDownSelectionRequested(SelectionBlueprint<HitObject> blueprint, MouseButtonEvent e)
{
if (e.ShiftPressed && e.Button == MouseButton.Left && pivot != null)
{
handleRangeSelection(blueprint, e.ControlPressed);
return true;
}
bool result = base.MouseDownSelectionRequested(blueprint, e);
// ensure that the object wasn't removed by the base implementation before making it the new pivot.
if (EditorBeatmap.HitObjects.Contains(blueprint.Item))
pivot = blueprint.Item;
return result;
}
/// <summary>
/// Handles a request for range selection (triggered when Shift is held down).
/// </summary>
/// <param name="blueprint">The blueprint which was clicked in range selection mode.</param>
/// <param name="cumulative">
/// Whether the selection should be cumulative.
/// In cumulative mode, consecutive range selections will shift the pivot (which usually stays fixed for the duration of a range selection)
/// and will never deselect an object that was previously selected.
/// </param>
private void handleRangeSelection(SelectionBlueprint<HitObject> blueprint, bool cumulative)
{
var clickedObject = blueprint.Item;
Debug.Assert(pivot != null);
double rangeStart = Math.Min(clickedObject.StartTime, pivot.StartTime);
double rangeEnd = Math.Max(clickedObject.GetEndTime(), pivot.GetEndTime());
var newSelection = new HashSet<HitObject>(EditorBeatmap.HitObjects.Where(obj => isInRange(obj, rangeStart, rangeEnd)));
if (cumulative)
{
pivot = clickedObject;
newSelection.UnionWith(EditorBeatmap.SelectedHitObjects);
}
EditorBeatmap.SelectedHitObjects.Clear();
EditorBeatmap.SelectedHitObjects.AddRange(newSelection);
bool isInRange(HitObject hitObject, double start, double end)
=> hitObject.StartTime >= start && hitObject.GetEndTime() <= end;
}
}
}