Oleg Bevz
11 years ago
16 changed files with 1126 additions and 1050 deletions
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// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System; |
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using System.ComponentModel; |
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using System.Linq; |
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namespace ICSharpCode.WpfDesign |
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{ |
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/// <summary>
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/// Description of DummyValueInsteadOfNullTypeDescriptionProvider.
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/// </summary>
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public sealed class DummyValueInsteadOfNullTypeDescriptionProvider : TypeDescriptionProvider |
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{ |
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// By using a TypeDescriptionProvider, we can intercept all access to the property that is
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// using a PropertyDescriptor. WpfDesign.XamlDom uses a PropertyDescriptor for accessing
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// properties (except for attached properties), so even DesignItemProperty/XamlProperty.ValueOnInstance
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// will report null when the actual value is the dummy value.
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readonly string _propertyName; |
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readonly object _dummyValue; |
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public DummyValueInsteadOfNullTypeDescriptionProvider(TypeDescriptionProvider existingProvider, |
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string propertyName, object dummyValue) |
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: base(existingProvider) |
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{ |
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this._propertyName = propertyName; |
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this._dummyValue = dummyValue; |
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} |
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public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance) |
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{ |
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return new ShadowTypeDescriptor(this, base.GetTypeDescriptor(objectType, instance)); |
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} |
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sealed class ShadowTypeDescriptor : CustomTypeDescriptor |
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{ |
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readonly DummyValueInsteadOfNullTypeDescriptionProvider _parent; |
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public ShadowTypeDescriptor(DummyValueInsteadOfNullTypeDescriptionProvider parent, |
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ICustomTypeDescriptor existingDescriptor) |
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: base(existingDescriptor) |
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{ |
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this._parent = parent; |
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} |
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public override PropertyDescriptorCollection GetProperties() |
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{ |
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return Filter(base.GetProperties()); |
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} |
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public override PropertyDescriptorCollection GetProperties(Attribute[] attributes) |
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{ |
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return Filter(base.GetProperties(attributes)); |
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} |
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PropertyDescriptorCollection Filter(PropertyDescriptorCollection properties) |
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{ |
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PropertyDescriptor property = properties[_parent._propertyName]; |
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if (property != null) { |
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if ((properties as System.Collections.IDictionary).IsReadOnly) { |
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properties = new PropertyDescriptorCollection(properties.Cast<PropertyDescriptor>().ToArray()); |
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} |
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properties.Remove(property); |
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properties.Add(new ShadowPropertyDescriptor(_parent, property)); |
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} |
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return properties; |
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} |
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} |
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sealed class ShadowPropertyDescriptor : PropertyDescriptor |
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{ |
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readonly DummyValueInsteadOfNullTypeDescriptionProvider _parent; |
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readonly PropertyDescriptor _baseDescriptor; |
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public ShadowPropertyDescriptor(DummyValueInsteadOfNullTypeDescriptionProvider parent, |
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PropertyDescriptor existingDescriptor) |
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: base(existingDescriptor) |
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{ |
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this._parent = parent; |
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this._baseDescriptor = existingDescriptor; |
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} |
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public override Type ComponentType { |
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get { return _baseDescriptor.ComponentType; } |
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} |
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public override bool IsReadOnly { |
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get { return _baseDescriptor.IsReadOnly; } |
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} |
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public override Type PropertyType { |
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get { return _baseDescriptor.PropertyType; } |
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} |
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public override bool CanResetValue(object component) |
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{ |
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return _baseDescriptor.CanResetValue(component); |
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} |
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public override object GetValue(object component) |
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{ |
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object value = _baseDescriptor.GetValue(component); |
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if (value == _parent._dummyValue) |
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return null; |
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else |
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return value; |
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} |
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public override void ResetValue(object component) |
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{ |
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_baseDescriptor.SetValue(component, _parent._dummyValue); |
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} |
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public override void SetValue(object component, object value) |
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{ |
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_baseDescriptor.SetValue(component, value ?? _parent._dummyValue); |
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} |
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public override bool ShouldSerializeValue(object component) |
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{ |
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return _baseDescriptor.ShouldSerializeValue(component) |
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&& _baseDescriptor.GetValue(component) != _parent._dummyValue; |
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} |
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} |
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} |
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} |
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