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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Trigger.cs / 1 / Trigger.cs
using MS.Utility; using System.IO; using System.Collections.Specialized; using System.ComponentModel; using System.Windows.Markup; using System; using System.Diagnostics; namespace System.Windows { ////// A single Style property conditional dependency driver /// [ContentProperty("Setters")] public class Trigger : TriggerBase, IAddChild { ////// DependencyProperty of the conditional /// [Localizability(LocalizationCategory.None, Modifiability = Modifiability.Unmodifiable, Readability = Readability.Unreadable)] // Not localizable by-default public DependencyProperty Property { get { // Verify Context Access VerifyAccess(); return _property; } set { // Verify Context Access VerifyAccess(); if (IsSealed) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "Trigger")); } _property = value; } } ////// Value of the condition (equality check) /// [DependsOn("Property")] [DependsOn("SourceName")] [Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)] // Not localizable by-default public object Value { get { // Verify Context Access VerifyAccess(); return _value; } set { // Verify Context Access VerifyAccess(); if (IsSealed) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "Trigger")); } 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 { // Verify Context Access VerifyAccess(); return _sourceName; } set { // Verify Context Access VerifyAccess(); if( IsSealed ) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "Trigger")); } _sourceName = value; } } ////// Collection of Setter objects, which describes what to apply /// when this trigger is active. /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public SetterBaseCollection Setters { get { // Verify Context Access VerifyAccess(); if( _setters == null ) { _setters = new SetterBaseCollection(); } return _setters; } } ////// This method is called to Add a Setter object as a child of the Style. /// /// /// The object to add as a child; it must be a Setter or subclass. /// void IAddChild.AddChild (Object value) { // Verify Context Access VerifyAccess(); Setters.Add(Trigger.CheckChildIsSetter(value)); } ////// This method is called by the parser when text appears under the tag in markup. /// As default Styles do not support text, calling this method has no effect. /// /// /// Text to add as a child. /// void IAddChild.AddText (string text) { // Verify Context Access VerifyAccess(); XamlSerializerUtil.ThrowIfNonWhiteSpaceInAddText(text, this); } // Shared by PropertyTrigger, MultiPropertyTrigger, DataTrigger, MultiDataTrigger internal static Setter CheckChildIsSetter( object o ) { if (o == null) { throw new ArgumentNullException("o"); } Setter setter = o as Setter; if (setter == null) { throw new ArgumentException(SR.Get(SRID.UnexpectedParameterType, o.GetType(), typeof(Setter)), "o"); } return setter; } internal sealed override void Seal() { if (IsSealed) { return; } if (_property != null) { // Ensure valid condition if (!_property.IsValidValue(_value)) { throw new InvalidOperationException(SR.Get(SRID.InvalidPropertyValue, _value, _property.Name )); } } // Freeze the condition for the trigger StyleHelper.SealIfSealable(_value); // Process the _setters collection: Copy values into PropertyValueList and seal the Setter objects. ProcessSettersCollection(_setters); // Build conditions array from collection TriggerConditions = new TriggerCondition[] { new TriggerCondition( _property, LogicalOp.Equals, _value, (_sourceName != null) ? _sourceName : StyleHelper.SelfName) }; // Set Condition for all property triggers for (int i = 0; i < PropertyValues.Count; i++) { PropertyValue propertyValue = PropertyValues[i]; propertyValue.Conditions = TriggerConditions; // Put back modified struct PropertyValues[i] = propertyValue; } base.Seal(); } // evaluate the current state of the trigger internal override bool GetCurrentState(DependencyObject container, UncommonFielddataField) { Debug.Assert( TriggerConditions != null && TriggerConditions.Length == 1, "This method assumes there is exactly one TriggerCondition." ); Debug.Assert( TriggerConditions[0].SourceChildIndex == 0, "This method was created to handle properties on the containing object, more work is needed to handle templated children too." ); return TriggerConditions[0].Match(container.GetValue(TriggerConditions[0].Property)); } private DependencyProperty _property; private object _value = DependencyProperty.UnsetValue; private string _sourceName = null; private SetterBaseCollection _setters = null; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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