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osu-lazer/osu.Game/Overlays/Settings/SettingsHeader.cs

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C#
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// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Sprites;
using osu.Game.Graphics;
using osu.Game.Graphics.Sprites;
using osu.Game.Graphics.UserInterface;
using OpenTK.Graphics;
namespace osu.Game.Overlays.Settings
{
public class SettingsHeader : Container
{
public SearchTextBox SearchTextBox;
private Box background;
private readonly Func<float> currentScrollOffset;
public Action Exit;
/// <param name="currentScrollOffset">A reference to the current scroll position of the ScrollContainer we are contained within.</param>
public SettingsHeader(Func<float> currentScrollOffset)
{
this.currentScrollOffset = currentScrollOffset;
}
[BackgroundDependencyLoader]
private void load(OsuColour colours)
{
RelativeSizeAxes = Axes.X;
AutoSizeAxes = Axes.Y;
Children = new Drawable[]
{
background = new Box
{
Colour = Color4.Black,
RelativeSizeAxes = Axes.Both,
},
new FillFlowContainer
{
AutoSizeAxes = Axes.Y,
RelativeSizeAxes = Axes.X,
Direction = FillDirection.Vertical,
Children = new Drawable[]
{
new OsuSpriteText
{
Text = "settings",
TextSize = 40,
Margin = new MarginPadding {
Left = SettingsOverlay.CONTENT_MARGINS,
Top = Toolbar.Toolbar.TOOLTIP_HEIGHT
},
},
new OsuSpriteText
{
Colour = colours.Pink,
Text = "Change the way osu! behaves",
TextSize = 18,
Margin = new MarginPadding {
Left = SettingsOverlay.CONTENT_MARGINS,
Bottom = 30
},
},
SearchTextBox = new SearchTextBox
{
RelativeSizeAxes = Axes.X,
Origin = Anchor.TopCentre,
Anchor = Anchor.TopCentre,
Width = 0.95f,
Margin = new MarginPadding {
Top = 20,
Bottom = 20
},
Exit = () => Exit(),
},
}
}
};
}
protected override void UpdateAfterChildren()
{
base.UpdateAfterChildren();
// the point at which we will start anchoring to the top.
float anchorOffset = SearchTextBox.Y;
float scrollPosition = currentScrollOffset();
// we want to anchor the search field to the top of the screen when scrolling.
Margin = new MarginPadding { Top = Math.Max(0, scrollPosition - anchorOffset) };
// we don't want the header to scroll when scrolling beyond the upper extent.
Y = Math.Min(0, scrollPosition);
// we get darker as scroll progresses
background.Alpha = Math.Min(1, scrollPosition / anchorOffset) * 0.5f;
}
}
}