/source/library/Interlace/Binding/Views/PropertyView.cs
C# | 140 lines | 92 code | 22 blank | 26 comment | 11 complexity | 8ff4b74de1dc3d77c18ef01c1137dbe8 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.Collections.Generic;
- using System.Text;
- using System.Reflection;
-
- #endregion
-
- namespace Interlace.Binding.Views
- {
- public class PropertyView : BinderViewBase
- {
- object _boundObject;
- string _propertyName;
- object _unboundValue;
-
- bool _ignoreChangedEvent;
-
- public PropertyView(object boundObject, string propertyName, object unboundValue)
- : this(boundObject, propertyName, unboundValue, false)
- {
- }
-
- public PropertyView(object boundObject, string propertyName, object unboundValue, bool readOnly)
- {
- _boundObject = boundObject;
- _propertyName = propertyName;
- _unboundValue = unboundValue;
- ViewToModelDisabled = readOnly;
-
- // Hook the property change event, if it exists on the object:
- EventInfo changeEvent = _boundObject.GetType().GetEvent(_propertyName + "Changed");
-
- if (changeEvent != null)
- {
- changeEvent.AddEventHandler(_boundObject, GetChangedEventHandler());
- }
- }
-
- protected virtual Delegate GetChangedEventHandler()
- {
- return new EventHandler(ChangedEventHandler);
- }
-
- protected void ChangedEventHandler(object sender, EventArgs e)
- {
- if (_ignoreChangedEvent) return;
-
- ChangeModel(GetProperty());
- }
-
- private void SetEditValueAndIgnoreEvents(object value)
- {
- try
- {
- _ignoreChangedEvent = true;
-
- SetProperty(value);
- }
- finally
- {
- _ignoreChangedEvent = false;
- }
- }
-
- protected override void OnModelChanged(object value)
- {
- if (value == BinderNotBound.Value || value == BinderMissingProperty.Value)
- {
- SetEditValueAndIgnoreEvents(_unboundValue);
- }
- else
- {
- SetEditValueAndIgnoreEvents(value);
- }
- }
-
- public object GetProperty()
- {
- PropertyInfo property = _boundObject.GetType().GetProperty(_propertyName);
-
- if (property == null)
- {
- throw new InvalidOperationException(String.Format(
- "The property \"{0}\" does not exist on the bound object.", _propertyName));
- }
-
- return property.GetValue(_boundObject, null);
- }
-
- public void SetProperty(object value)
- {
- PropertyInfo property = _boundObject.GetType().GetProperty(_propertyName);
-
- if (property == null)
- {
- throw new InvalidOperationException(String.Format(
- "The property \"{0}\" does not exist on the bound object.", _propertyName));
- }
-
- try
- {
- _ignoreChangedEvent = true;
-
- property.SetValue(_boundObject, value, null);
- }
- finally
- {
- _ignoreChangedEvent = false;
- }
- }
- }
- }