mirror of https://github.com/ppy/osu
65 lines
2.2 KiB
C#
65 lines
2.2 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 osu.Framework.Graphics;
|
|
using osu.Game.Graphics.Containers;
|
|
|
|
namespace osu.Game.Overlays.Chat
|
|
{
|
|
/// <summary>
|
|
/// An <see cref="OsuScrollContainer"/> with functionality to automatically scroll whenever the maximum scrollable distance increases.
|
|
/// </summary>
|
|
public class ChannelScrollContainer : OsuScrollContainer
|
|
{
|
|
/// <summary>
|
|
/// The chat will be automatically scrolled to end if and only if
|
|
/// the distance between the current scroll position and the end of the scroll
|
|
/// is less than this value.
|
|
/// </summary>
|
|
private const float auto_scroll_leniency = 10f;
|
|
|
|
private bool trackNewContent = true;
|
|
|
|
protected override void UpdateAfterChildren()
|
|
{
|
|
base.UpdateAfterChildren();
|
|
|
|
if (trackNewContent && !IsScrolledToEnd())
|
|
ScrollToEnd();
|
|
}
|
|
|
|
private void updateTrackState() => trackNewContent = IsScrolledToEnd(auto_scroll_leniency);
|
|
|
|
// todo: we may eventually want this encapsulated in a "OnScrollChange" event handler method provided by ScrollContainer.
|
|
// important to note that this intentionally doesn't consider OffsetScrollPosition, but could make it do so with side changes.
|
|
|
|
#region Scroll handling
|
|
|
|
protected override void OnUserScroll(float value, bool animated = true, double? distanceDecay = null)
|
|
{
|
|
base.OnUserScroll(value, animated, distanceDecay);
|
|
updateTrackState();
|
|
}
|
|
|
|
public new void ScrollIntoView(Drawable d, bool animated = true)
|
|
{
|
|
base.ScrollIntoView(d, animated);
|
|
updateTrackState();
|
|
}
|
|
|
|
public new void ScrollToStart(bool animated = true, bool allowDuringDrag = false)
|
|
{
|
|
base.ScrollToStart(animated, allowDuringDrag);
|
|
updateTrackState();
|
|
}
|
|
|
|
public new void ScrollToEnd(bool animated = true, bool allowDuringDrag = false)
|
|
{
|
|
base.ScrollToEnd(animated, allowDuringDrag);
|
|
updateTrackState();
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|