ValuePattern.cs :  » 2.6.4-mono-.net-core » System.Windows » System » Windows » Automation » C# / CSharp Open Source

// Permission is hereby granted, free of charge, to any person obtaining 
// a copy of this software and associated documentation files (the 
// "Software"), to deal in the Software without restriction, including 
// without limitation the rights to use, copy, modify, merge, publish, 
// distribute, sublicense, and/or sell copies of the Software, and to 
// permit persons to whom the Software is furnished to do so, subject to 
// the following conditions: 
//  
// The above copyright notice and this permission notice shall be 
// included in all copies or substantial portions of the Software. 
//  
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
// 
// Copyright (c) 2009 Novell, Inc. (http://www.novell.com) 
// 
// Authors: 
//  Sandy Armstrong <sanfordarmstrong@gmail.com>
//  Mike Gorse <mgorse@novell.com>
// 

using System;
using Mono.UIAutomation.Source;

namespace System.Windows.Automation{
  public class ValuePattern : BasePattern
  {
    public struct ValuePatternInformation
    {
      private bool cache;
      private ValuePattern pattern;

      internal ValuePatternInformation (ValuePattern pattern, bool cache)
      {
        this.pattern = pattern;
        this.cache = cache;
      }

      public string Value {
        get { return (string) pattern.element.GetPropertyValue (ValueProperty, cache); }
      }

      public bool IsReadOnly {
        get { return (bool) pattern.element.GetPropertyValue (IsReadOnlyProperty, cache); }
      }
    }

    private AutomationElement element;
    private bool cached;
    private ValuePatternInformation currentInfo;
    private ValuePatternInformation cachedInfo;

    internal ValuePattern ()
    {
    }

    internal ValuePattern (IValuePattern source, AutomationElement element, bool cached)
    {
      this.element = element;
      this.cached = cached;
      this.Source = source;
      currentInfo = new ValuePatternInformation (this, false);
      if (cached)
        cachedInfo = new ValuePatternInformation (this, true);
    }

    internal IValuePattern Source { get; private set; }

    public ValuePatternInformation Cached {
      get {
        if (!cached)
          throw new InvalidOperationException ("Cannot request a property or pattern that is not cached");
        return cachedInfo;
      }
    }

    public ValuePatternInformation Current {
      get {
        return currentInfo;
      }
    }

    public void SetValue (string value)
    {
      Source.SetValue (value);
    }

    public static readonly AutomationPattern Pattern =
      ValuePatternIdentifiers.Pattern;

    public static readonly AutomationProperty ValueProperty =
      ValuePatternIdentifiers.ValueProperty;

    public static readonly AutomationProperty IsReadOnlyProperty =
      ValuePatternIdentifiers.IsReadOnlyProperty;
  }
}