/source/library/Interlace/Binding/PropertyBinderModel.cs
C# | 184 lines | 120 code | 39 blank | 25 comment | 24 complexity | 61f6b33b014a5d1698fff689fa7ddb1a MD5 | raw file
- #region Using Directives and Copyright Notice
-
- // Copyright (c) 2007-2010, Computer Consultancy Pty Ltd
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without
- // modification, are permitted provided that the following conditions are met:
- // * Redistributions of source code must retain the above copyright
- // notice, this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above copyright
- // notice, this list of conditions and the following disclaimer in the
- // documentation and/or other materials provided with the distribution.
- // * Neither the name of the Computer Consultancy Pty Ltd nor the
- // names of its contributors may be used to endorse or promote products
- // derived from this software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- // ARE DISCLAIMED. IN NO EVENT SHALL COMPUTER CONSULTANCY PTY LTD BE LIABLE
- // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
- // DAMAGE.
-
- using System;
- using System.ComponentModel;
- using System.Collections.Generic;
- using System.Text;
- using System.Reflection;
-
- #endregion
-
- namespace Interlace.Binding
- {
- class PropertyBinderModel : Interlace.Binding.IBinderModel
- {
- private string _propertyName;
-
- object _boundTo;
- Type _boundToType;
-
- bool _ignoreChangedEvent;
-
- private BinderController _controller;
-
- public PropertyBinderModel(string propertyName)
- {
- _propertyName = propertyName;
-
- _boundTo = null;
-
- _ignoreChangedEvent = false;
- }
-
- public BinderController Controller
- {
- set { _controller = value; }
- }
-
- public string GetDescriptionForTracing()
- {
- if (_boundTo == null) return string.Format(
- "Property \"{0}\" of null", _propertyName);
-
- return string.Format("Property \"{0}\" of \"{1}\", type \"{2}\"",
- _propertyName, _boundTo, _boundToType.Name);
- }
-
- private void ConnectEvents()
- {
- EventInfo changeEvent = _boundToType.GetEvent(_propertyName + "Changed");
-
- if (changeEvent != null)
- {
- changeEvent.AddEventHandler(_boundTo, new EventHandler(ChangedEventHandler));
- }
- else
- {
- if (_boundTo is INotifyPropertyChanged)
- {
- INotifyPropertyChanged notifier = _boundTo as INotifyPropertyChanged;
-
- notifier.PropertyChanged += new PropertyChangedEventHandler(PropertyChangedEventHandler);
- }
- }
- }
-
- private void DisconnectEvents()
- {
- EventInfo changeEvent = _boundToType.GetEvent(_propertyName + "Changed");
-
- if (changeEvent != null)
- {
- changeEvent.RemoveEventHandler(_boundTo, new EventHandler(ChangedEventHandler));
- }
- else
- {
- if (_boundTo is INotifyPropertyChanged)
- {
- INotifyPropertyChanged notifier = _boundTo as INotifyPropertyChanged;
-
- notifier.PropertyChanged -= new PropertyChangedEventHandler(PropertyChangedEventHandler);
- }
- }
- }
-
- public void ConnectBoundToObject(object boundTo)
- {
- if (_boundTo != null)
- {
- DisconnectEvents();
- }
-
- _boundTo = boundTo;
- _boundToType = boundTo.GetType();
-
- ConnectEvents();
-
- _controller.OnModelModified();
- }
-
- public void DisconnectBoundToObject()
- {
- if (_boundTo != null)
- {
- DisconnectEvents();
- }
-
- _boundTo = null;
- _boundToType = null;
-
- _controller.OnModelModified();
- }
-
- private void ChangedEventHandler(object sender, EventArgs e)
- {
- if (_ignoreChangedEvent) return;
-
- _controller.OnModelModified();
- }
-
- void PropertyChangedEventHandler(object sender, PropertyChangedEventArgs e)
- {
- if (_ignoreChangedEvent) return;
-
- if (e.PropertyName == _propertyName) _controller.OnModelModified();
- }
-
- public object GetValue()
- {
- if (_boundTo == null) return BinderNotBound.Value;
-
- PropertyInfo property = _boundToType.GetProperty(_propertyName);
-
- if (property == null) return BinderMissingProperty.Value;
-
- return property.GetValue(_boundTo, null);
- }
-
- public void SetValue(object value)
- {
- if (_boundTo == null) return;
-
- PropertyInfo property = _boundToType.GetProperty(_propertyName);
-
- if (property == null) return;
-
- try
- {
- _ignoreChangedEvent = true;
-
- property.SetValue(_boundTo, value, null);
- }
- finally
- {
- _ignoreChangedEvent = false;
- }
- }
- }
- }