wpftoolkit/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/Core/Converters/VisibilityToBoolConverter.cs

/*************************************************************************************
   
   Toolkit for WPF

   Copyright (C) 2007-2020 Xceed Software Inc.

   This program is provided to you under the terms of the XCEED SOFTWARE, INC.
   COMMUNITY LICENSE AGREEMENT (for non-commercial use) as published at 
   https://github.com/xceedsoftware/wpftoolkit/blob/master/license.md 

   For more features, controls, and fast professional support,
   pick up the Plus Edition at https://xceed.com/xceed-toolkit-plus-for-wpf/

   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids

  ***********************************************************************************/

using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;
using Xceed.Wpf.Toolkit.Core;

namespace Xceed.Wpf.Toolkit.Core.Converters
{
  public class VisibilityToBoolConverter : IValueConverter
  {
    #region Inverted Property

    public bool Inverted
    {
      get
      {
        return _inverted;
      }
      set
      {
        _inverted = value;
      }
    }

    private bool _inverted; //false

    #endregion

    #region Not Property

    public bool Not
    {
      get
      {
        return _not;
      }
      set
      {
        _not = value;
      }
    }

    private bool _not; //false

    #endregion

    public object Convert( object value, Type targetType, object parameter, CultureInfo culture )
    {
      return this.Inverted ? this.BoolToVisibility( value ) : this.VisibilityToBool( value );
    }

    public object ConvertBack( object value, Type targetType, object parameter, CultureInfo culture )
    {
      return this.Inverted ? this.VisibilityToBool( value ) : this.BoolToVisibility( value );
    }

    private object VisibilityToBool( object value )
    {
      if( !( value is Visibility ) )
        throw new InvalidOperationException( ErrorMessages.GetMessage( "SuppliedValueWasNotVisibility" ) );

      return ( ( ( Visibility )value ) == Visibility.Visible ) ^ Not;
    }

    private object BoolToVisibility( object value )
    {
      if( !( value is bool ) )
        throw new InvalidOperationException( ErrorMessages.GetMessage( "SuppliedValueWasNotBool" ) );

      return ( ( bool )value ^ Not ) ? Visibility.Visible : Visibility.Collapsed;
    }
  }
}