Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / DataObjectEventArgs.cs / 1 / DataObjectEventArgs.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Base class for DataObject events arguments // //--------------------------------------------------------------------------- using System; namespace System.Windows { ////// Base class for DataObject.Copying/Pasting events. /// These events are raised when an editor deals with /// a data object before putting it to clipboard on copy /// and before starting drag operation; /// or before Pasting its content into a selection /// on Paste/Drop operations. /// /// This class is abstract - it provides only common /// members for the events. Particular commands /// must use more specific event arguments - /// DataObjectCopyingEventArgs or DataObjectPastingEventArgs. /// public abstract class DataObjectEventArgs : RoutedEventArgs { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors ////// Creates a DataObjectCopyEvent. /// This object created by editors executing a Copy/Paste /// and Drag/Drop comands. /// /// /// An event id. One of: CopyingEvent or PastingEvent /// /// /// A flag indicating if this operation is part of drag/drop. /// Copying event fired on drag start, Pasting - on drop. /// Cancelling the command stops drag/drop process in /// an appropriate moment. /// internal DataObjectEventArgs(RoutedEvent routedEvent, bool isDragDrop) : base() { if (routedEvent != DataObject.CopyingEvent && routedEvent != DataObject.PastingEvent && routedEvent != DataObject.SettingDataEvent) { throw new ArgumentOutOfRangeException("routedEvent"); } RoutedEvent = routedEvent; _isDragDrop = isDragDrop; _commandCancelled = false; } #endregion Constructors //------------------------------------------------------ // // Public Properties // //----------------------------------------------------- #region Public Properties ////// A flag indicating if this operation is part of drag/drop. /// Copying event fired on drag start, Pasting - on drop. /// Cancelling the command stops drag/drop process in /// an appropriate moment. /// public bool IsDragDrop { get { return _isDragDrop; } } ////// A current cancellation status of the event. /// When set to true, copy command is going to be cancelled. /// public bool CommandCancelled { get { return _commandCancelled; } } #endregion Public Properties //------------------------------------------------------ // // Protected Methods // //------------------------------------------------------ #region Public Methods ////// Sets cancelled status of a command to true. /// After calling this method the command will be /// stopped from calling. /// Applied to Drag (event="Copying", isDragDrop="true") /// this would stop the whole dragdrop process. /// ////// After an event has been cancelled it's impossible /// to re-enable it. /// public void CancelCommand() { _commandCancelled = true; } #endregion Public Methods //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Fields private bool _isDragDrop; private bool _commandCancelled; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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