// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace System.Drawing.Printing;
 
/// <summary>
///  Provides data for the <see cref='PrintDocument.QueryPageSettings'/> event.
/// </summary>
public class QueryPageSettingsEventArgs : PrintEventArgs
{
    private PageSettings _pageSettings;
 
    /// <summary>
    ///  Initializes a new instance of the <see cref='QueryPageSettingsEventArgs'/> class.
    /// </summary>
    public QueryPageSettingsEventArgs(PageSettings pageSettings) : base() => _pageSettings = pageSettings;
 
    /// <summary>
    ///  Gets or sets the page settings for the page to be printed.
    /// </summary>
    public PageSettings PageSettings
    {
        get
        {
            PageSettingsChanged = true;
            return _pageSettings;
        }
        set
        {
            value ??= new PageSettings();
            _pageSettings = value;
            PageSettingsChanged = true;
        }
    }
 
    /// <summary>
    ///  It's too expensive to compare 2 instances of PageSettings class, as the getters are accessing the printer
    ///  spooler, thus we track any explicit invocations of the setters or getters on this class, and this field tracks
    ///  if PageSettings property was accessed. It will return a false positive when the user is reading property values,
    ///  but we'll take a perf hit in this case assuming this event is not used often.
    /// </summary>
    internal bool PageSettingsChanged { get; set; }
}