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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.
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#nullable disable
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using System ;
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using JetBrains.Annotations ;
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using osu.Framework.Graphics ;
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using osu.Framework.Graphics.Shapes ;
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using osu.Framework.Input.Events ;
using osuTK ;
using osuTK.Graphics ;
namespace osu.Game.Graphics.UserInterface
{
/// <summary>
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/// A layer that will show a loading spinner and completely block input to an area.
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/// Also optionally dims target elements.
/// Useful for disabling all elements in a form and showing we are waiting on a response, for instance.
/// </summary>
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public partial class LoadingLayer : LoadingSpinner
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{
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private readonly bool blockInput ;
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[CanBeNull]
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protected Box BackgroundDimLayer { get ; }
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/// <summary>
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/// Construct a new loading spinner.
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/// </summary>
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/// <param name="dimBackground">Whether the full background area should be dimmed while loading.</param>
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/// <param name="withBox">Whether the spinner should have a surrounding black box for visibility.</param>
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/// <param name="blockInput">Whether to block input of components behind the loading layer.</param>
public LoadingLayer ( bool dimBackground = false , bool withBox = true , bool blockInput = true )
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: base ( withBox )
{
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this . blockInput = blockInput ;
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RelativeSizeAxes = Axes . Both ;
Size = new Vector2 ( 1 ) ;
MainContents . RelativeSizeAxes = Axes . None ;
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if ( dimBackground )
{
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AddInternal ( BackgroundDimLayer = new Box
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{
Depth = float . MaxValue ,
Colour = Color4 . Black ,
Alpha = 0 ,
RelativeSizeAxes = Axes . Both ,
} ) ;
}
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}
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public override bool HandleNonPositionalInput = > false ;
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protected override bool Handle ( UIEvent e )
{
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if ( ! blockInput )
return false ;
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switch ( e )
{
// blocking scroll can cause weird behaviour when this layer is used within a ScrollContainer.
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case ScrollEvent :
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return false ;
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// blocking touch events causes the ISourcedFromTouch versions to not be fired, potentially impeding behaviour of drawables *above* the loading layer that may utilise these.
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// note that this will not work well if touch handling elements are beneath this loading layer (something to consider for the future).
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case TouchEvent :
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return false ;
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}
return true ;
}
protected override void PopIn ( )
{
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BackgroundDimLayer ? . FadeTo ( 0.5f , TRANSITION_DURATION * 2 , Easing . OutQuint ) ;
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base . PopIn ( ) ;
}
protected override void PopOut ( )
{
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BackgroundDimLayer ? . FadeOut ( TRANSITION_DURATION , Easing . OutQuint ) ;
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base . PopOut ( ) ;
}
protected override void Update ( )
{
base . Update ( ) ;
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MainContents . Size = new Vector2 ( Math . Clamp ( Math . Min ( DrawWidth , DrawHeight ) * 0.25f , 20 , 100 ) ) ;
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}
}
}