Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Condition.cs / 1 / Condition.cs
using MS.Utility; using System.IO; using System.Windows.Markup; using System.ComponentModel; using System; using System.Windows.Data; namespace System.Windows { ////// Condition for a multiple property or data trigger /// public sealed class Condition { ////// Constructor with no property reference nor value /// public Condition() { _property = null; _binding = null; } ////// Constructor for creating a Condition /// public Condition( DependencyProperty conditionProperty, object conditionValue ) : this(conditionProperty, conditionValue, null) { // Call Forwarded } ////// Constructor for creating a Condition with the given property /// and value instead of creating an empty one and setting values later. /// ////// This constructor does parameter validation, which before doesn't /// happen until Seal() is called. We can do it here because we get /// both at the same time. /// public Condition( DependencyProperty conditionProperty, object conditionValue, string sourceName ) { if( conditionProperty == null ) { throw new ArgumentNullException("conditionProperty"); } if( !conditionProperty.IsValidValue( conditionValue ) ) { throw new ArgumentException(SR.Get(SRID.InvalidPropertyValue, conditionValue, conditionProperty.Name)); } _property = conditionProperty; Value = conditionValue; _sourceName = sourceName; } ////// Constructor for creating a Condition with the given binding declaration. /// and value. /// public Condition( BindingBase binding, object conditionValue ) { if( binding == null ) { throw new ArgumentNullException("binding"); } Binding = binding; Value = conditionValue; } ////// DepedencyProperty of the conditional /// [DefaultValue(null)] public DependencyProperty Property { get { return _property; } set { if (_sealed) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "Condition")); } if( _binding != null ) { throw new InvalidOperationException(SR.Get(SRID.ConditionCannotUseBothPropertyAndBinding)); } _property = value; } } ////// Binding of the conditional /// [DefaultValue(null)] public BindingBase Binding { get { return _binding; } set { if (_sealed) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "Condition")); } if( _property != null ) { throw new InvalidOperationException(SR.Get(SRID.ConditionCannotUseBothPropertyAndBinding)); } _binding = value; } } ////// Value of the condition (equality check) /// public object Value { get { return _value; } set { if (_sealed) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "Condition")); } if (value is MarkupExtension) { throw new ArgumentException(SR.Get(SRID.ConditionValueOfMarkupExtensionNotSupported, value.GetType().Name)); } if( value is Expression ) { throw new ArgumentException(SR.Get(SRID.ConditionValueOfExpressionNotSupported)); } _value = value; } } ////// The x:Name of the object whose property shall /// trigger the associated setters to be applied. /// If null, then this is the object being Styled /// and not anything under its Template Tree. /// [DefaultValue(null)] public string SourceName { get { return _sourceName; } set { if( _sealed ) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "Condition")); } _sourceName = value; } } ////// Seal the condition so that it can no longer be modified /// internal void Seal(ValueLookupType type) { if (_sealed) { return; } _sealed = true; // Ensure valid condition if (_property != null && _binding != null) throw new InvalidOperationException(SR.Get(SRID.ConditionCannotUseBothPropertyAndBinding)); switch (type) { case ValueLookupType.Trigger: case ValueLookupType.PropertyTriggerResource: if (_property == null) { throw new InvalidOperationException(SR.Get(SRID.NullPropertyIllegal, "Property")); } if (!_property.IsValidValue(_value)) { throw new InvalidOperationException(SR.Get(SRID.InvalidPropertyValue, _value, _property.Name)); } break; case ValueLookupType.DataTrigger: case ValueLookupType.DataTriggerResource: if (_binding == null) { throw new InvalidOperationException(SR.Get(SRID.NullPropertyIllegal, "Binding")); } break; default: throw new InvalidOperationException(SR.Get(SRID.UnexpectedValueTypeForCondition, type)); } // Freeze the condition value StyleHelper.SealIfSealable(_value); } private bool _sealed = false; private DependencyProperty _property; private BindingBase _binding; private object _value = DependencyProperty.UnsetValue; private string _sourceName = null; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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