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osu-lazer/osu.Game.Rulesets.Mania/Edit/ManiaSelectionHandler.cs

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// 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.
using System;
using System.Linq;
using osu.Framework.Allocation;
using osu.Framework.Timing;
using osu.Game.Rulesets.Edit;
using osu.Game.Rulesets.Mania.Edit.Blueprints;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Rulesets.UI;
using osu.Game.Rulesets.UI.Scrolling;
using osu.Game.Screens.Edit.Compose.Components;
namespace osu.Game.Rulesets.Mania.Edit
{
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public class ManiaSelectionHandler : SelectionHandler
{
[Resolved]
private IScrollingInfo scrollingInfo { get; set; }
[Resolved]
private IManiaHitObjectComposer composer { get; set; }
private IClock editorClock;
[BackgroundDependencyLoader]
private void load(IAdjustableClock clock)
{
editorClock = clock;
}
public override bool HandleMovement(MoveSelectionEvent moveEvent)
{
var maniaBlueprint = (ManiaSelectionBlueprint)moveEvent.Blueprint;
int lastColumn = maniaBlueprint.DrawableObject.HitObject.Column;
adjustOrigins(maniaBlueprint);
performDragMovement(moveEvent);
performColumnMovement(lastColumn, moveEvent);
return true;
}
/// <summary>
/// Ensures that the position of hitobjects remains centred to the mouse position.
/// E.g. The hitobject position will change if the editor scrolls while a hitobject is dragged.
/// </summary>
/// <param name="reference">The <see cref="ManiaSelectionBlueprint"/> that received the drag event.</param>
private void adjustOrigins(ManiaSelectionBlueprint reference)
{
var referenceParent = (HitObjectContainer)reference.DrawableObject.Parent;
float offsetFromReferenceOrigin = reference.DragPosition.Y - reference.DrawableObject.OriginPosition.Y;
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float targetPosition = referenceParent.ToLocalSpace(reference.ScreenSpaceDragPosition).Y - offsetFromReferenceOrigin;
// Flip the vertical coordinate space when scrolling downwards
if (scrollingInfo.Direction.Value == ScrollingDirection.Down)
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targetPosition -= referenceParent.DrawHeight;
float movementDelta = targetPosition - reference.DrawableObject.Position.Y;
foreach (var b in SelectedBlueprints.OfType<ManiaSelectionBlueprint>())
b.DrawableObject.Y += movementDelta;
}
private void performDragMovement(MoveSelectionEvent moveEvent)
{
float delta = moveEvent.InstantDelta.Y;
// When scrolling downwards the anchor position is at the bottom of the screen, however the movement event assumes the anchor is at the top of the screen.
// This causes the delta to assume a positive hitobject position, and which can be corrected for by subtracting the parent height.
if (scrollingInfo.Direction.Value == ScrollingDirection.Down)
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delta -= moveEvent.Blueprint.Parent.DrawHeight; // todo: probably wrong
foreach (var selectionBlueprint in SelectedBlueprints)
{
var b = (OverlaySelectionBlueprint)selectionBlueprint;
var hitObject = b.DrawableObject;
var objectParent = (HitObjectContainer)hitObject.Parent;
// StartTime could be used to adjust the position if only one movement event was received per frame.
// However this is not the case and ScrollingHitObjectContainer performs movement in UpdateAfterChildren() so the position must also be updated to be valid for further movement events
hitObject.Y += delta;
float targetPosition = hitObject.Position.Y;
// The scrolling algorithm always assumes an anchor at the top of the screen, so the position must be flipped when scrolling downwards to reflect a top anchor
if (scrollingInfo.Direction.Value == ScrollingDirection.Down)
targetPosition = -targetPosition;
objectParent.Remove(hitObject);
hitObject.HitObject.StartTime = scrollingInfo.Algorithm.TimeAt(targetPosition,
editorClock.CurrentTime,
scrollingInfo.TimeRange.Value,
objectParent.DrawHeight);
objectParent.Add(hitObject);
}
}
private void performColumnMovement(int lastColumn, MoveSelectionEvent moveEvent)
{
var currentColumn = composer.ColumnAt(moveEvent.ScreenSpacePosition);
if (currentColumn == null)
return;
int columnDelta = currentColumn.Index - lastColumn;
if (columnDelta == 0)
return;
int minColumn = int.MaxValue;
int maxColumn = int.MinValue;
foreach (var obj in SelectedHitObjects.OfType<ManiaHitObject>())
{
if (obj.Column < minColumn)
minColumn = obj.Column;
if (obj.Column > maxColumn)
maxColumn = obj.Column;
}
columnDelta = Math.Clamp(columnDelta, -minColumn, composer.TotalColumns - 1 - maxColumn);
foreach (var obj in SelectedHitObjects.OfType<ManiaHitObject>())
obj.Column += columnDelta;
}
}
}