src/Files.App/Data/Contexts/MultiPanes/MultiPanesContext.cs - main - githubmirror/Files

src/Files.App/Data/Contexts/MultiPanes/MultiPanesContext.cs
113 строк3 KB
yair100
Code Quality: Updated headers
01 июл 2026, 06:18
01 июл 2026, 06:18c27305a
// Copyright (c) Files Community
// SPDX-License-Identifier: MPL-2.0

namespace Files.App.Data.Contexts
{
	/// <inheritdoc cref="IMultiPanesContext"/>
	internal sealed class MultiPanesContext : IMultiPanesContext
	{
		private ShellPanesPage? _mainPanesPage;

		private IShellPage? _ActivePane;
		/// <inheritdoc/>
		public IShellPage? ActivePane
			=> _ActivePane;

		private IShellPage? _ActivePaneOrColumn;
		/// <inheritdoc/>
		public IShellPage? ActivePaneOrColumn
			=> _ActivePaneOrColumn;

		private ShellPaneArrangement _ShellPaneArrangement;
		/// <inheritdoc/>
		public ShellPaneArrangement ShellPaneArrangement
			=> _ShellPaneArrangement;

		/// <inheritdoc/>
		public event EventHandler? ActivePaneChanging;

		/// <inheritdoc/>
		public event EventHandler? ActivePaneChanged;

		/// <inheritdoc/>
		public event EventHandler? ShellPaneArrangementChanged;

		/// <summary>
		/// Initializes an instance of <see cref="MultiPanesContext"/>.
		/// </summary>
		public MultiPanesContext()
		{
			ShellPanesPage.CurrentInstanceChanged += Page_CurrentInstanceChanged;
		}

		private void Page_CurrentInstanceChanged(object? sender, ShellPanesPage? modifiedPage)
		{
			if (_mainPanesPage is not null && !_mainPanesPage.IsCurrentInstance)
			{
				UpdatePage(null);
			}
			else if (modifiedPage is not null && modifiedPage.IsCurrentInstance)
			{
				UpdatePage(modifiedPage);
			}
		}

		private void Page_ContentChanged(object? sender, TabBarItemParameter e)
		{
			UpdateContent();
		}

		private void Page_PropertyChanged(object? sender, PropertyChangedEventArgs e)
		{
			switch (e.PropertyName)
			{
				case nameof(IShellPanesPage.ActivePaneOrColumn):
					UpdateContent();
					break;
				case nameof(IShellPanesPage.ShellPaneArrangement):
					_ShellPaneArrangement = ActivePane?.PaneHolder.ShellPaneArrangement ?? ShellPaneArrangement.Horizontal;
					ShellPaneArrangementChanged?.Invoke(this, EventArgs.Empty);
					break;
			}
		}

		private void UpdatePage(ShellPanesPage? newPage)
		{
			if (Equals(_mainPanesPage, newPage))
				return;

			if (_mainPanesPage is not null)
			{
				_mainPanesPage.ContentChanged -= Page_ContentChanged;
				_mainPanesPage.PropertyChanged -= Page_PropertyChanged;
			}

			_mainPanesPage = newPage;

			if (_mainPanesPage is not null)
			{
				_mainPanesPage.ContentChanged += Page_ContentChanged;
				_mainPanesPage.PropertyChanged += Page_PropertyChanged;
			}

			UpdateContent();
		}

		private void UpdateContent()
		{
			if (_ActivePane == _mainPanesPage?.ActivePane &&
				_ActivePaneOrColumn == _mainPanesPage?.ActivePaneOrColumn)
				return;

			ActivePaneChanging?.Invoke(this, EventArgs.Empty);

			_ActivePane = _mainPanesPage?.ActivePane;
			_ActivePaneOrColumn = _mainPanesPage?.ActivePaneOrColumn;

			ActivePaneChanged?.Invoke(this, EventArgs.Empty);

			_ShellPaneArrangement = ActivePane?.PaneHolder.ShellPaneArrangement ?? ShellPaneArrangement.Horizontal;
			ShellPaneArrangementChanged?.Invoke(this, EventArgs.Empty);
		}
	}
}