122 lines
3.9 KiB
C#
122 lines
3.9 KiB
C#
// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// (C) 2005 Iain McCoy
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//
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// Copyright (c) 2007 Novell, Inc. (http://www.novell.com)
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//
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// Authors:
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// Iain McCoy (iain@mccoy.id.au)
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// Chris Toshok (toshok@ximian.com)
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//
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namespace System.Windows {
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public class PropertyMetadata {
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private object defaultValue;
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private bool isSealed;
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private PropertyChangedCallback propertyChangedCallback;
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private CoerceValueCallback coerceValueCallback;
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protected bool IsSealed {
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get { return isSealed; }
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}
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public object DefaultValue {
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get { return defaultValue; }
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set {
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if (IsSealed)
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throw new InvalidOperationException ("Cannot change metadata once it has been applied to a property");
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if (value == DependencyProperty.UnsetValue)
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throw new ArgumentException ("Cannot set property metadata's default value to 'Unset'");
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defaultValue = value;
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}
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}
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public PropertyChangedCallback PropertyChangedCallback {
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get { return propertyChangedCallback; }
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set {
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if (IsSealed)
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throw new InvalidOperationException ("Cannot change metadata once it has been applied to a property");
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propertyChangedCallback = value;
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}
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}
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public CoerceValueCallback CoerceValueCallback {
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get { return coerceValueCallback; }
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set {
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if (IsSealed)
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throw new InvalidOperationException ("Cannot change metadata once it has been applied to a property");
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coerceValueCallback = value;
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}
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}
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public PropertyMetadata()
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: this (null, null, null)
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{
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}
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public PropertyMetadata(object defaultValue)
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: this (defaultValue, null, null)
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{
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}
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public PropertyMetadata (PropertyChangedCallback propertyChangedCallback)
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: this (null, propertyChangedCallback, null)
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{
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}
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public PropertyMetadata (object defaultValue, PropertyChangedCallback propertyChangedCallback)
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: this (defaultValue, propertyChangedCallback, null)
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{
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}
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public PropertyMetadata (object defaultValue, PropertyChangedCallback propertyChangedCallback, CoerceValueCallback coerceValueCallback)
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{
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if (defaultValue == DependencyProperty.UnsetValue)
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throw new ArgumentException ("Cannot initialize property metadata's default value to 'Unset'");
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this.defaultValue = defaultValue;
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this.propertyChangedCallback = propertyChangedCallback;
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this.coerceValueCallback = coerceValueCallback;
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}
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protected virtual void Merge (PropertyMetadata baseMetadata, DependencyProperty dp)
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{
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if (defaultValue == null)
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defaultValue = baseMetadata.defaultValue;
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if (propertyChangedCallback == null)
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propertyChangedCallback = baseMetadata.propertyChangedCallback;
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if (coerceValueCallback == null)
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coerceValueCallback = baseMetadata.coerceValueCallback;
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}
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protected virtual void OnApply (DependencyProperty dp, Type targetType)
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{
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}
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internal void DoMerge (PropertyMetadata baseMetadata, DependencyProperty dp, Type targetType)
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{
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Merge (baseMetadata, dp);
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OnApply (dp, targetType);
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isSealed = true;
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}
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}
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}
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