Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / DataTrigger.cs / 1 / DataTrigger.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Defines DataTrigger object, akin to Trigger except it // gets values from data. // //--------------------------------------------------------------------------- using System; using System.Collections.Specialized; using System.ComponentModel; using System.Diagnostics; using System.Windows.Data; using System.Windows.Markup; namespace System.Windows { ////// A single Style data conditional dependency driver /// [ContentProperty("Setters")] public class DataTrigger : TriggerBase, IAddChild { ////// Binding declaration of the conditional /// [Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)] // Not localizable by-default public BindingBase Binding { get { // Verify Context Access VerifyAccess(); return _binding; } set { // Verify Context Access VerifyAccess(); if (IsSealed) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "DataTrigger")); } _binding = value; } } ////// Value of the condition (equality check) /// [DependsOn("Binding")] [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, "DataTrigger")); } 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; } } ////// 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); } internal sealed override void Seal() { if (IsSealed) { return; } // Process the _setters collection: Copy values into PropertyValueList and seal the Setter objects. ProcessSettersCollection(_setters); // Freeze the value for the trigger StyleHelper.SealIfSealable(_value); // Build conditions array from collection TriggerConditions = new TriggerCondition[] { new TriggerCondition( _binding, LogicalOp.Equals, _value) }; // Set Condition for all data triggers for (int i = 0; i < PropertyValues.Count; i++) { PropertyValue propertyValue = PropertyValues[i]; propertyValue.Conditions = TriggerConditions; switch (propertyValue.ValueType) { case PropertyValueType.Trigger: propertyValue.ValueType = PropertyValueType.DataTrigger; break; case PropertyValueType.PropertyTriggerResource: propertyValue.ValueType = PropertyValueType.DataTriggerResource; break; default: throw new InvalidOperationException(SR.Get(SRID.UnexpectedValueTypeForDataTrigger, propertyValue.ValueType)); } // 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." ); return TriggerConditions[0].ConvertAndMatch(StyleHelper.GetDataTriggerValue(dataField, container, TriggerConditions[0].Binding)); } private BindingBase _binding; private object _value = DependencyProperty.UnsetValue; private SetterBaseCollection _setters = null; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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