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using System;
using System.Windows.Input;
using System.Windows.Threading;
namespace MaterialDesignThemes.Wpf
{
/// <summary>
/// Allows an open dialog to be managed. Use is only permitted during a single display operation.
/// </summary>
public class DialogSession
{
private readonly DialogHost _owner;
internal DialogSession(DialogHost owner)
{
if (owner == null) throw new ArgumentNullException(nameof(owner));
_owner = owner;
}
/// <summary>
/// Indicates if the dialog session has ended. Once ended no further method calls will be permitted.
/// </summary>
/// <remarks>
/// Client code cannot set this directly, this is internally managed. To end the dicalog session use <see cref="Close()"/>.
/// </remarks>
public bool IsEnded { get; internal set; }
/// <summary>
/// Gets the <see cref="DialogHost.DialogContent"/> which is currently displayed, so this could be a view model or a UI element.
/// </summary>
public object Content => _owner.DialogContent;
/// <summary>
/// Update the currrent content in the dialog.
/// </summary>
/// <param name="content"></param>
public void UpdateContent(object content)
{
if (content == null) throw new ArgumentNullException(nameof(content));
_owner.AssertTargetableContent();
_owner.DialogContent = content;
_owner.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() =>
{
_owner.FocusPopup();
}));
}
/// <summary>
/// Closes the dialog.
/// </summary>
/// <exception cref="InvalidOperationException">Thrown if the dialog session has ended, or a close operation is currently in progress.</exception>
public void Close()
{
if (IsEnded) throw new InvalidOperationException("Dialog session has ended.");
_owner.Close(null);
}
/// <summary>
/// Closes the dialog.
/// </summary>
/// <param name="parameter">Result parameter which will be returned in <see cref="DialogClosingEventArgs.Parameter"/> or from <see cref="DialogHost.Show(object)"/> method.</param>
/// <exception cref="InvalidOperationException">Thrown if the dialog session has ended, or a close operation is currently in progress.</exception>
public void Close(object parameter)
{
if (IsEnded) throw new InvalidOperationException("Dialog session has ended.");
_owner.Close(parameter);
}
}
}
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