osu/osu.Game/Graphics/UserInterface/PageSelector/PageSelector.cs
2023-06-24 01:00:03 +09:00

104 lines
3.5 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 System;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics;
using osu.Framework.Bindables;
using osu.Game.Resources.Localisation.Web;
namespace osu.Game.Graphics.UserInterface.PageSelector
{
public partial class PageSelector : CompositeDrawable
{
public readonly BindableInt CurrentPage = new BindableInt { MinValue = 0, };
public readonly BindableInt AvailablePages = new BindableInt(1) { MinValue = 1, };
private readonly FillFlowContainer itemsFlow;
private readonly PageSelectorPrevNextButton previousPageButton;
private readonly PageSelectorPrevNextButton nextPageButton;
public PageSelector()
{
AutoSizeAxes = Axes.Both;
InternalChild = new FillFlowContainer
{
AutoSizeAxes = Axes.Both,
Direction = FillDirection.Horizontal,
Children = new Drawable[]
{
previousPageButton = new PageSelectorPrevNextButton(false, CommonStrings.PaginationPrevious)
{
Action = () => CurrentPage.Value -= 1,
},
itemsFlow = new FillFlowContainer
{
AutoSizeAxes = Axes.Both,
Direction = FillDirection.Horizontal,
},
nextPageButton = new PageSelectorPrevNextButton(true, CommonStrings.PaginationNext)
{
Action = () => CurrentPage.Value += 1
}
}
};
}
protected override void LoadComplete()
{
base.LoadComplete();
CurrentPage.BindValueChanged(_ => Scheduler.AddOnce(redraw));
AvailablePages.BindValueChanged(_ =>
{
CurrentPage.Value = 0;
// AddOnce as the reset of CurrentPage may also trigger a redraw.
Scheduler.AddOnce(redraw);
}, true);
}
private void redraw()
{
if (CurrentPage.Value >= AvailablePages.Value)
{
CurrentPage.Value = AvailablePages.Value - 1;
return;
}
previousPageButton.Enabled.Value = CurrentPage.Value != 0;
nextPageButton.Enabled.Value = CurrentPage.Value < AvailablePages.Value - 1;
itemsFlow.Clear();
int totalPages = AvailablePages.Value;
bool lastWasEllipsis = false;
for (int i = 0; i < totalPages; i++)
{
int pageIndex = i;
bool shouldShowPage = pageIndex == 0 || pageIndex == totalPages - 1 || Math.Abs(pageIndex - CurrentPage.Value) <= 2;
if (shouldShowPage)
{
lastWasEllipsis = false;
itemsFlow.Add(new PageSelectorPageButton(pageIndex + 1)
{
Action = () => CurrentPage.Value = pageIndex,
Selected = CurrentPage.Value == pageIndex,
});
}
else if (!lastWasEllipsis)
{
lastWasEllipsis = true;
itemsFlow.Add(new PageEllipsis());
}
}
}
}
}