MultiTrigger.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / MultiTrigger.cs / 1 / MultiTrigger.cs
                        

                        
                            using System.Collections.Specialized; 
using System.ComponentModel;
using System.IO;
using System.Windows.Markup;
 
using MS.Utility;
 
using System; 
using System.Diagnostics;
 
namespace System.Windows
{
    /// 
    ///     A multiple Style property conditional dependency driver 
    /// 
    [ContentProperty("Setters")] 
    public sealed class MultiTrigger : 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.Trigger);
            } 
 
            // Build conditions array from collection
            TriggerConditions = new TriggerCondition[_conditions.Count]; 

            for (int i = 0; i < TriggerConditions.Length; i++)
            {
                TriggerConditions[i] = new TriggerCondition( 
                    _conditions[i].Property,
                    LogicalOp.Equals, 
                    _conditions[i].Value, 
                    (_conditions[i].SourceName != null) ? _conditions[i].SourceName : StyleHelper.SelfName);
            } 

            // Set conditions array 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, UncommonField dataField) 
        { 
            bool retVal = (TriggerConditions.Length > 0);
 
            for( int i = 0; retVal && i < TriggerConditions.Length; i++ )
            {
                Debug.Assert( TriggerConditions[i].SourceChildIndex == 0,
                    "This method was created to handle properties on the containing object, more work is needed to handle templated children too." ); 

                retVal = TriggerConditions[i].Match(container.GetValue(TriggerConditions[i].Property)); 
            } 

            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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