DesignModeSite.cs :  » 2.6.4-mono-.net-core » System.ComponentModel » System » ComponentModel » Design » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.ComponentModel 
System.ComponentModel » System » ComponentModel » Design » DesignModeSite.cs
//
// System.ComponentModel.Design.DesignModeSite
//
// Authors:   
//    Ivan N. Zlatev (contact i-nZ.net)
//
// (C) 2006-2007 Ivan N. Zlatev

//
// 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.
//

#if NET_2_0

using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;

namespace System.ComponentModel.Design{

  internal class DesignModeSite : ISite, IDictionaryService, IServiceProvider, IServiceContainer
  {

    // The DesignModeSite:
    //  * offers the IDictionaryService and INestedContaineroffers site-specific services
    //  * implements the IServiceContainer interface, but according to the tests it:
    //    - does *NOT* offer IServiceContainer as a site-specific service
    //    - offers the added site-specific services via IServiceProvider
    
    private IServiceProvider _serviceProvider;
    private IComponent _component;
    private IContainer _container;
    private string _componentName;
    private NestedContainer _nestedContainer;


    public DesignModeSite (IComponent component, string name, IContainer container, IServiceProvider serviceProvider)
    {
      _component = component;
      _container = container;
      _componentName = name;
      _serviceProvider = serviceProvider;
    }

    public IComponent Component {
      get { return _component; }
    }

    public IContainer Container {
      get { return _container; }
    }

    // Yay yay yay, guess who's in design mode ???
    //
    public bool DesignMode {
      get { return true; }
    }

    // The place where renaming of a component takes place.
    // We should validate the new name here, if INameCreation service is present
    //
    public string Name {
      get {
        return _componentName;
      }
      set {
        if (value != _componentName && value != null && value.Trim().Length > 0) {
          INameCreationService nameService = this.GetService (typeof (INameCreationService)) as INameCreationService;
          IComponent component = _container.Components[value]; // get the component with that name

          if (component == null &&
              (nameService == null || (nameService != null && nameService.IsValidName (value)))) {
            string oldName = _componentName;
            _componentName = value;
            ((DesignerHost)this.GetService (typeof (IDesignerHost))).OnComponentRename (_component, oldName, _componentName);
          }
        }
      }
    }

#region IServiceContainer

    private ServiceContainer _siteSpecificServices;

    private ServiceContainer SiteSpecificServices {
      get {
        if (_siteSpecificServices == null)
          _siteSpecificServices = new ServiceContainer (null);

        return _siteSpecificServices;
      }
    }

    void IServiceContainer.AddService (Type serviceType, object serviceInstance)
    {
      SiteSpecificServices.AddService (serviceType, serviceInstance);
    }

    void IServiceContainer.AddService (Type serviceType, object serviceInstance, bool promote)
    {
      SiteSpecificServices.AddService (serviceType, serviceInstance, promote);
    }
    void IServiceContainer.AddService (Type serviceType, ServiceCreatorCallback callback)
    {
      SiteSpecificServices.AddService (serviceType, callback);
    }

    void IServiceContainer.AddService (Type serviceType, ServiceCreatorCallback callback, bool promote)
    {
      SiteSpecificServices.AddService (serviceType, callback, promote);
    }

    void IServiceContainer.RemoveService (Type serviceType)
    {
      SiteSpecificServices.RemoveService (serviceType);
    }

    void IServiceContainer.RemoveService (Type serviceType, bool promote)
    {
      SiteSpecificServices.RemoveService (serviceType, promote);
    }

#endregion


#region IDictionaryService

    private Hashtable _dictionary;

    object IDictionaryService.GetKey (object value)
    {
      if (_dictionary != null) {
        foreach (DictionaryEntry entry in _dictionary) {
          if (value != null && value.Equals (entry.Value))
            return entry.Key;
        }
      }
      return null;
    }

    object IDictionaryService.GetValue (object key)
    {
      if (_dictionary != null)
        return _dictionary[key];

      return null;
    }

    // No Remove method: seting the value to null
    // will remove the pair.
    //
    void IDictionaryService.SetValue (object key, object value)
    {
      if (_dictionary == null)
        _dictionary = new Hashtable ();

      if (value == null)
        _dictionary.Remove (key);

      _dictionary[key] = value;
    }

#endregion

    
#region IServiceProvider

    public virtual object GetService (Type service)
    {
      object serviceInstance = null;

      if (typeof (IDictionaryService) == service)
        serviceInstance = (IDictionaryService) this;

      if (typeof (INestedContainer) == service) {
        if (_nestedContainer == null)
          _nestedContainer = new DesignModeNestedContainer (_component, null);
        serviceInstance = _nestedContainer;
      }

      // Avoid returning the site specific IServiceContainer
      if (serviceInstance == null && service != typeof (IServiceContainer) &&
          _siteSpecificServices != null)
        serviceInstance = _siteSpecificServices.GetService (service);

      if (serviceInstance == null)
        serviceInstance = _serviceProvider.GetService (service);

      return serviceInstance;
    }
#endregion

  }
}
#endif
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