osu/osu.Game/Overlays/OverlayScrollContainer.cs
2020-09-03 16:34:58 +09:00

150 lines
4.8 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.
using System.Collections.Generic;
using osu.Framework.Allocation;
using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Effects;
using osu.Framework.Graphics.Shapes;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Input.Events;
using osu.Game.Graphics.Containers;
using osuTK;
using osuTK.Graphics;
namespace osu.Game.Overlays
{
/// <summary>
/// <see cref="OsuScrollContainer"/> which provides <see cref="ScrollToTopButton"/>. Mostly used in <see cref="FullscreenOverlay{T}"/>.
/// </summary>
public class OverlayScrollContainer : OsuScrollContainer
{
/// <summary>
/// Scroll position at which the <see cref="ScrollToTopButton"/> will be shown.
/// </summary>
private const int button_scroll_position = 200;
protected readonly ScrollToTopButton Button;
public OverlayScrollContainer()
{
AddInternal(Button = new ScrollToTopButton
{
Anchor = Anchor.BottomRight,
Origin = Anchor.BottomRight,
Margin = new MarginPadding(20),
Action = () =>
{
ScrollToStart();
Button.State = Visibility.Hidden;
}
});
}
protected override void UpdateAfterChildren()
{
base.UpdateAfterChildren();
if (ScrollContent.DrawHeight + button_scroll_position < DrawHeight)
{
Button.State = Visibility.Hidden;
return;
}
Button.State = Target > button_scroll_position ? Visibility.Visible : Visibility.Hidden;
}
public class ScrollToTopButton : OsuHoverContainer
{
private const int fade_duration = 500;
private Visibility state;
public Visibility State
{
get => state;
set
{
if (value == state)
return;
state = value;
Enabled.Value = state == Visibility.Visible;
this.FadeTo(state == Visibility.Visible ? 1 : 0, fade_duration, Easing.OutQuint);
}
}
protected override IEnumerable<Drawable> EffectTargets => new[] { background };
private Color4 flashColour;
private readonly Container content;
private readonly Box background;
public ScrollToTopButton()
{
Size = new Vector2(50);
Alpha = 0;
Add(content = new CircularContainer
{
RelativeSizeAxes = Axes.Both,
Anchor = Anchor.Centre,
Origin = Anchor.Centre,
Masking = true,
EdgeEffect = new EdgeEffectParameters
{
Type = EdgeEffectType.Shadow,
Offset = new Vector2(0f, 1f),
Radius = 3f,
Colour = Color4.Black.Opacity(0.25f),
},
Children = new Drawable[]
{
background = new Box
{
RelativeSizeAxes = Axes.Both
},
new SpriteIcon
{
Anchor = Anchor.Centre,
Origin = Anchor.Centre,
Size = new Vector2(15),
Icon = FontAwesome.Solid.ChevronUp
}
}
});
TooltipText = "Scroll to top";
}
[BackgroundDependencyLoader]
private void load(OverlayColourProvider colourProvider)
{
IdleColour = colourProvider.Background6;
HoverColour = colourProvider.Background5;
flashColour = colourProvider.Light1;
}
protected override bool OnClick(ClickEvent e)
{
background.FlashColour(flashColour, 800, Easing.OutQuint);
return base.OnClick(e);
}
protected override bool OnMouseDown(MouseDownEvent e)
{
content.ScaleTo(0.75f, 2000, Easing.OutQuint);
return true;
}
protected override void OnMouseUp(MouseUpEvent e)
{
content.ScaleTo(1, 1000, Easing.OutElastic);
base.OnMouseUp(e);
}
}
}
}