osu/osu.Game/Graphics/UserInterface/PageSelector/PageSelector.cs

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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.
using System.Linq;
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using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics;
using osu.Framework.Bindables;
namespace osu.Game.Graphics.UserInterface.PageSelector
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{
public class PageSelector : CompositeDrawable
{
public readonly BindableInt CurrentPage = new BindableInt { MinValue = 0, };
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public readonly BindableInt AvailablePages = new BindableInt(1) { MinValue = 1, };
private readonly FillFlowContainer itemsFlow;
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private readonly PageSelectorPrevNextButton previousPageButton;
private readonly PageSelectorPrevNextButton nextPageButton;
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public PageSelector()
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{
AutoSizeAxes = Axes.Both;
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InternalChild = new FillFlowContainer
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{
AutoSizeAxes = Axes.Both,
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Direction = FillDirection.Horizontal,
Children = new Drawable[]
{
previousPageButton = new PageSelectorPrevNextButton(false, "prev")
{
Action = () => CurrentPage.Value -= 1,
},
itemsFlow = new FillFlowContainer
{
AutoSizeAxes = Axes.Both,
Direction = FillDirection.Horizontal,
},
nextPageButton = new PageSelectorPrevNextButton(true, "next")
{
Action = () => CurrentPage.Value += 1
}
}
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};
}
protected override void LoadComplete()
{
base.LoadComplete();
CurrentPage.BindValueChanged(onCurrentPageChanged);
AvailablePages.BindValueChanged(_ => redraw(), true);
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}
private void onCurrentPageChanged(ValueChangedEvent<int> currentPage)
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{
if (currentPage.NewValue >= AvailablePages.Value)
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{
CurrentPage.Value = AvailablePages.Value - 1;
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return;
}
foreach (var page in itemsFlow.OfType<PageSelectorPageButton>())
page.Selected = page.PageNumber == currentPage.NewValue + 1;
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previousPageButton.Enabled.Value = currentPage.NewValue != 0;
nextPageButton.Enabled.Value = currentPage.NewValue < AvailablePages.Value - 1;
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}
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private void redraw()
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{
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itemsFlow.Clear();
for (int i = 0; i < AvailablePages.Value; i++)
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{
int pageIndex = i;
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itemsFlow.Add(new PageSelectorPageButton(pageIndex + 1)
{
Action = () => CurrentPage.Value = pageIndex,
});
}
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if (CurrentPage.Value != 0)
CurrentPage.Value = 0;
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else
CurrentPage.TriggerChange();
}
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}
}