osu/osu.Game/Screens/OsuScreen.cs

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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
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using osu.Framework.Allocation;
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using osu.Framework.Configuration;
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using osu.Framework.Screens;
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using osu.Game.Beatmaps;
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using osu.Game.Graphics.Containers;
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namespace osu.Game.Screens
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{
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public abstract class OsuScreen : Screen
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{
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internal BackgroundScreen Background { get; private set; }
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/// <summary>
/// Override to create a BackgroundMode for the current GameMode.
/// Note that the instance created may not be the used instance if it matches the BackgroundMode equality clause.
/// </summary>
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protected virtual BackgroundScreen CreateBackground() => null;
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internal virtual bool ShowOverlays => true;
protected new OsuGameBase Game => base.Game as OsuGameBase;
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internal virtual bool HasLocalCursorDisplayed => false;
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private readonly Bindable<WorkingBeatmap> beatmap = new Bindable<WorkingBeatmap>();
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public WorkingBeatmap Beatmap
{
get
{
return beatmap.Value;
}
set
{
beatmap.Value = value;
}
}
[BackgroundDependencyLoader(permitNulls: true)]
private void load(OsuGameBase game)
{
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if (game != null)
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{
//if we were given a beatmap at ctor time, we want to pass this on to the game-wide beatmap.
var localMap = beatmap.Value;
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beatmap.BindTo(game.Beatmap);
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if (localMap != null)
beatmap.Value = localMap;
}
beatmap.ValueChanged += OnBeatmapChanged;
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}
protected virtual void OnBeatmapChanged(WorkingBeatmap beatmap)
{
}
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protected override void OnEntering(Screen last)
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{
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OsuScreen lastOsu = last as OsuScreen;
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BackgroundScreen bg = CreateBackground();
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OnBeatmapChanged(Beatmap);
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if (lastOsu?.Background != null)
{
if (bg == null || lastOsu.Background.Equals(bg))
//we can keep the previous mode's background.
Background = lastOsu.Background;
else
{
lastOsu.Background.Push(Background = bg);
}
}
else if (bg != null)
{
AddInternal(new ParallaxContainer
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{
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Depth = float.MaxValue,
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Children = new[]
{
Background = bg
}
});
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}
base.OnEntering(last);
}
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protected override bool OnExiting(Screen next)
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{
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OsuScreen nextOsu = next as OsuScreen;
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if (Background != null && !Background.Equals(nextOsu?.Background))
{
if (nextOsu != null)
//We need to use MakeCurrent in case we are jumping up multiple game modes.
nextOsu.Background?.MakeCurrent();
else
Background.Exit();
}
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return base.OnExiting(next);
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}
}
}