Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / MultiDataTrigger.cs / 1 / MultiDataTrigger.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Defines MultiDataTrigger object, akin to MultiTrigger except it // gets values from data. // //--------------------------------------------------------------------------- using MS.Utility; using System; using System.Diagnostics; using System.Collections.Specialized; using System.ComponentModel; using System.Windows.Data; using System.Windows.Markup; namespace System.Windows { ////// A multiple Style data conditional dependency driver /// [ContentProperty("Setters")] public sealed class MultiDataTrigger : TriggerBase, IAddChild { ////// Conditions collection /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public ConditionCollection Conditions { get { // Verify Context Access VerifyAccess(); return _conditions; } } ////// 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 override void Seal() { if (IsSealed) { return; } // Process the _setters collection: Copy values into PropertyValueList and seal the Setter objects. ProcessSettersCollection(_setters); if (_conditions.Count > 0) { // Seal conditions _conditions.Seal(ValueLookupType.DataTrigger); } // Build conditions array from collection TriggerConditions = new TriggerCondition[_conditions.Count]; for (int i = 0; i < TriggerConditions.Length; ++i) { if (_conditions[i].SourceName != null && _conditions[i].SourceName.Length > 0) { throw new InvalidOperationException(SR.Get(SRID.SourceNameNotSupportedForDataTriggers)); } TriggerConditions[i] = new TriggerCondition( _conditions[i].Binding, LogicalOp.Equals, _conditions[i].Value); } // Set conditions array for all property 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) { bool retVal = (TriggerConditions.Length > 0); for( int i = 0; retVal && i < TriggerConditions.Length; i++ ) { retVal = TriggerConditions[i].ConvertAndMatch(StyleHelper.GetDataTriggerValue(dataField, container, TriggerConditions[i].Binding)); } return retVal; } private ConditionCollection _conditions = new ConditionCollection(); 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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