osu/osu.Game/Overlays/DialogOverlay.cs

// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Game.Overlays.Dialog;
using osu.Game.Graphics.Containers;

namespace osu.Game.Overlays
{
    public class DialogOverlay : OsuFocusedOverlayContainer
    {
        private readonly Container dialogContainer;
        private PopupDialog currentDialog;

        public DialogOverlay()
        {
            RelativeSizeAxes = Axes.Both;

            Child = dialogContainer = new Container
            {
                RelativeSizeAxes = Axes.Both,
            };

            Width = 0.4f;
            Anchor = Anchor.BottomCentre;
            Origin = Anchor.BottomCentre;
        }

        public void Push(PopupDialog dialog)
        {
            if (dialog == currentDialog) return;

            currentDialog?.Hide();
            currentDialog = dialog;

            dialogContainer.Add(currentDialog);

            currentDialog.Show();
            currentDialog.StateChanged += state => onDialogOnStateChanged(dialog, state);
            State = Visibility.Visible;
        }

        protected override bool PlaySamplesOnStateChange => false;

        protected override bool BlockNonPositionalInput => true;

        private void onDialogOnStateChanged(VisibilityContainer dialog, Visibility v)
        {
            if (v != Visibility.Hidden) return;

            //handle the dialog being dismissed.
            dialog.Delay(PopupDialog.EXIT_DURATION).Expire();

            if (dialog == currentDialog)
                State = Visibility.Hidden;
        }

        protected override void PopIn()
        {
            base.PopIn();
            this.FadeIn(PopupDialog.ENTER_DURATION, Easing.OutQuint);
        }

        protected override void PopOut()
        {
            base.PopOut();

            if (currentDialog?.State == Visibility.Visible)
            {
                currentDialog.Hide();
                return;
            }

            this.FadeOut(PopupDialog.EXIT_DURATION, Easing.InSine);
        }
    }
}