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180 lines
8.6 KiB
C#
180 lines
8.6 KiB
C#
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/*
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* Greenshot - a free and open source screenshot tool
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* Copyright (C) 2007-2013 Thomas Braun, Jens Klingen, Robin Krom
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*
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* For more information see: http://getgreenshot.org/
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* The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.ComponentModel;
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using System.Reflection;
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namespace Greenshot.Drawing.Fields.Binding
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{
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/// <summary>
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/// Bidirectional binding of properties of two INotifyPropertyChanged instances.
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/// This implementation synchronizes null values, too. If you do not want this
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/// behavior (e.g. when binding to a
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/// </summary>
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public class BidirectionalBinding
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{
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private INotifyPropertyChanged controlObject;
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private INotifyPropertyChanged fieldObject;
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private string controlPropertyName;
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private string fieldPropertyName;
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private bool updatingControl = false;
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private bool updatingField = false;
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private IBindingConverter converter;
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private IBindingValidator validator;
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/// <summary>
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/// Whether or not null values are passed on to the other object.
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/// </summary>
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protected bool AllowSynchronizeNull = true;
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/// <summary>
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/// Bind properties of two objects bidirectionally
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/// </summary>
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/// <param name="object1">Object containing 1st property to bind</param>
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/// <param name="property1">Property of 1st object to bind</param>
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/// <param name="object2">Object containing 2nd property to bind</param>
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/// <param name="property2">Property of 2nd object to bind</param>
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public BidirectionalBinding(INotifyPropertyChanged controlObject, string controlPropertyName, INotifyPropertyChanged fieldObject, string fieldPropertyName)
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{
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this.controlObject = controlObject;
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this.fieldObject = fieldObject;
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this.controlPropertyName = controlPropertyName;
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this.fieldPropertyName = fieldPropertyName;
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this.controlObject.PropertyChanged += ControlPropertyChanged;
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this.fieldObject.PropertyChanged += FieldPropertyChanged;
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}
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/// <summary>
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/// Bind properties of two objects bidirectionally, converting the values using a converter
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/// </summary>
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/// <param name="controlObject">Object containing 1st property to bind</param>
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/// <param name="controlPropertyName">Property of 1st object to bind</param>
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/// <param name="fieldObject">Object containing 2nd property to bind</param>
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/// <param name="fieldPropertyName">Property of 2nd object to bind</param>
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/// <param name="converter">taking care of converting the synchronzied value to the correct target format and back</param>
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public BidirectionalBinding(INotifyPropertyChanged controlObject, string controlPropertyName, INotifyPropertyChanged fieldObject, string fieldPropertyName, IBindingConverter converter)
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: this(controlObject, controlPropertyName, fieldObject, fieldPropertyName)
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{
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this.converter = converter;
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}
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/// <summary>
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/// Bind properties of two objects bidirectionally, converting the values using a converter.
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/// Synchronization can be intercepted by adding a validator.
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/// </summary>
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/// <param name="controlObject">Object containing 1st property to bind</param>
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/// <param name="controlPropertyName">Property of 1st object to bind</param>
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/// <param name="fieldObject">Object containing 2nd property to bind</param>
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/// <param name="fieldPropertyName">Property of 2nd object to bind</param>
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/// <param name="validator">validator to intercept synchronisation if the value does not match certain criteria</param>
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public BidirectionalBinding(INotifyPropertyChanged controlObject, string controlPropertyName, INotifyPropertyChanged fieldObject, string fieldPropertyName, IBindingValidator validator)
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: this(controlObject, controlPropertyName, fieldObject, fieldPropertyName)
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{
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this.validator = validator;
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}
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/// <summary>
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/// Bind properties of two objects bidirectionally, converting the values using a converter.
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/// Synchronization can be intercepted by adding a validator.
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/// </summary>
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/// <param name="controlObject">Object containing 1st property to bind</param>
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/// <param name="controlPropertyName">Property of 1st object to bind</param>
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/// <param name="fieldObject">Object containing 2nd property to bind</param>
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/// <param name="fieldPropertyName">Property of 2nd object to bind</param>
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/// <param name="converter">taking care of converting the synchronzied value to the correct target format and back</param>
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/// <param name="validator">validator to intercept synchronisation if the value does not match certain criteria</param>
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public BidirectionalBinding(INotifyPropertyChanged controlObject, string controlPropertyName, INotifyPropertyChanged fieldObject, string fieldPropertyName, IBindingConverter converter, IBindingValidator validator)
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: this(controlObject, controlPropertyName, fieldObject, fieldPropertyName, converter)
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{
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this.validator = validator;
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}
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public void ControlPropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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if (!updatingControl && e.PropertyName.Equals(controlPropertyName))
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{
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updatingField = true;
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synchronize(controlObject, controlPropertyName, fieldObject, fieldPropertyName);
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updatingField = false;
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}
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}
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public void FieldPropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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if (!updatingField && e.PropertyName.Equals(fieldPropertyName))
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{
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updatingControl = true;
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synchronize(fieldObject, fieldPropertyName, controlObject, controlPropertyName);
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updatingControl = false;
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}
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}
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private void synchronize(INotifyPropertyChanged sourceObject, string sourceProperty, INotifyPropertyChanged targetObject, string targetProperty)
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{
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PropertyInfo targetPropertyInfo = resolvePropertyInfo(targetObject, targetProperty);
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PropertyInfo sourcePropertyInfo = resolvePropertyInfo(sourceObject, sourceProperty);
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if (sourcePropertyInfo != null && targetPropertyInfo != null && targetPropertyInfo.CanWrite)
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{
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object bValue = sourcePropertyInfo.GetValue(sourceObject, null);
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if (converter != null && bValue != null)
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{
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bValue = converter.convert(bValue);
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}
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try
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{
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if (validator == null || validator.validate(bValue))
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{
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targetPropertyInfo.SetValue(targetObject, bValue, null);
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}
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}
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catch (Exception e)
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{
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throw new MemberAccessException("Could not set property '" + targetProperty + "' to '" + bValue + "' [" + ((bValue != null) ? bValue.GetType().Name : "") + "] on " + targetObject + ". Probably other type than expected, IBindingCoverter to the rescue.", e);
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}
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}
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}
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private PropertyInfo resolvePropertyInfo(object obj, string property)
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{
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PropertyInfo ret = null;
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string[] properties = property.Split(".".ToCharArray());
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for (int i = 0; i < properties.Length; i++)
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{
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string prop = properties[i];
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ret = obj.GetType().GetProperty(prop);
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if (ret != null && ret.CanRead && i < prop.Length - 1)
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{
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obj = ret.GetValue(obj, null);
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}
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}
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return ret;
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}
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public IBindingConverter Converter
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{
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get { return converter; }
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set { converter = value; }
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}
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}
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}
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