Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / TriggerAction.cs / 1 / TriggerAction.cs
/****************************************************************************\ * * File: TriggerAction.cs * * A TriggerAction is stored within a Trigger object as one of the actions to * be performed by that trigger. A Trigger object is similar to an if/then * statement, and by that analogy a TriggerActionCollection is the entire * "then" block of the Trigger, and a TriggerAction is a single line within * the "then" block. * * Copyright (C) by Microsoft Corporation. All rights reserved. * \***************************************************************************/ using System; using MS.Internal; namespace System.Windows { ////// A class that describes an action to perform for a trigger /// public abstract class TriggerAction : DependencyObject { ////// Internal constructor - nobody is supposed to ever create an instance /// of this class. Use a derived class instead. /// internal TriggerAction() { } ////// Called when all conditions have been satisfied for this action to be /// invoked. (Conditions are not described on this TriggerAction object, /// but on the Trigger object holding it.) /// ////// This variant is called when the Trigger lives in a Style, and /// hence given a reference to its corresponding Style object. /// internal abstract void Invoke( FrameworkElement fe, FrameworkContentElement fce, Style targetStyle, FrameworkTemplate targetTemplate, Int64 layer); ////// Called when all conditions have been satisfied for this action to be /// invoked. (Conditions are not described on this TriggerAction object, /// but on the Trigger object holding it.) /// ////// This variant is called when the Trigger lives on an element, as /// opposed to Style, so it is given only the reference to the element. /// internal abstract void Invoke( FrameworkElement fe ); ////// The EventTrigger object that contains this action. /// ////// A TriggerAction may need to get back to the Trigger that /// holds it, this is the back-link to allow that. Also, this allows /// us to verify that each TriggerAction is associated with one and /// only one Trigger. /// internal TriggerBase ContainingTrigger { get { return _containingTrigger; } } ////// Seal this TriggerAction to prevent further updates /// ////// TriggerActionCollection will call this method to seal individual /// TriggerAction objects. We do some check here then call the /// parameter-less Seal() so subclasses can also do what they need to do. /// internal void Seal( TriggerBase containingTrigger ) { if( IsSealed && containingTrigger != _containingTrigger ) { throw new InvalidOperationException(SR.Get(SRID.TriggerActionMustBelongToASingleTrigger)); } _containingTrigger = containingTrigger; Seal(); } ////// A derived class overrideing Seal() should set object state such /// that further changes are not allowed. This is also a time to make /// validation checks to see if all parameters make sense. /// internal override void Seal() { if( IsSealed ) { throw new InvalidOperationException(SR.Get(SRID.TriggerActionAlreadySealed)); } base.Seal(); } ////// Checks sealed status and throws exception if object is sealed /// internal void CheckSealed() { if( IsSealed ) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "TriggerAction")); } } // Define the DO's inheritance context internal override DependencyObject InheritanceContext { get { return _inheritanceContext; } } // Receive a new inheritance context (this will be a FE/FCE) internal override void AddInheritanceContext(DependencyObject context, DependencyProperty property) { InheritanceContextHelper.AddInheritanceContext(context, this, ref _hasMultipleInheritanceContexts, ref _inheritanceContext); } // Remove an inheritance context (this will be a FE/FCE) internal override void RemoveInheritanceContext(DependencyObject context, DependencyProperty property) { InheritanceContextHelper.RemoveInheritanceContext(context, this, ref _hasMultipleInheritanceContexts, ref _inheritanceContext); } ////// Says if the current instance has multiple InheritanceContexts /// internal override bool HasMultipleInheritanceContexts { get { return _hasMultipleInheritanceContexts; } } private TriggerBase _containingTrigger = null; // Fields to implement DO's inheritance context private DependencyObject _inheritanceContext = null; private bool _hasMultipleInheritanceContexts = false; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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