Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / DragEventArgs.cs / 1 / DragEventArgs.cs
//---------------------------------------------------------------------------- // // File: DragEventArgs.cs // // Copyright (C) Microsoft Corporation. All rights reserved. // // Description: DragEventArgs for drag-and-drop operation. // // // History: // 08/19/2004 : [....] Created // //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows.Media; using System.Windows.Input; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows { ////// The DragEventArgs class represents a type of RoutedEventArgs that /// are relevant to all drag events(DragEnter/DragOver/DragLeave/DragDrop). /// public sealed class DragEventArgs : RoutedEventArgs { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors ////// Constructs a DragEventArgs instance. /// /// /// The data object used in this drag drop operation. /// /// /// The current state of the mouse button and modifier keys. /// /// /// Allowed effects of a drag-and-drop operation. /// /// /// The target of the event. /// /// /// The current mouse position of the target. /// internal DragEventArgs(IDataObject data, DragDropKeyStates dragDropKeyStates, DragDropEffects allowedEffects, DependencyObject target, Point point) { if (!DragDrop.IsValidDragDropKeyStates(dragDropKeyStates)) { Debug.Assert(false, "Invalid dragDropKeyStates"); } if (!DragDrop.IsValidDragDropEffects(allowedEffects)) { Debug.Assert(false, "Invalid allowedEffects"); } if (target == null) { Debug.Assert(false, "Invalid target"); } this._data = data; this._dragDropKeyStates = dragDropKeyStates; this._allowedEffects = allowedEffects; this._target = target; this._dropPoint = point; this._effects = allowedEffects; } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods ////// The point of drop operation that based on relativeTo. /// public Point GetPosition(IInputElement relativeTo) { Point dropPoint; if (relativeTo == null) { throw new ArgumentNullException("relativeTo"); } dropPoint = new Point(0, 0); if (_target != null) { // Translate the drop point from the drop target to the relative element. dropPoint = InputElement.TranslatePoint(_dropPoint, _target, (DependencyObject)relativeTo); } return dropPoint; } #endregion Public Methods //------------------------------------------------------ // // Public Properties // //------------------------------------------------------ #region Public Properties ////// The data object of drop operation /// public IDataObject Data { get { return _data; } } ////// The DragDropKeyStates that indicates the current states for /// physical keyboard keys and mouse buttons. /// public DragDropKeyStates KeyStates { get { return _dragDropKeyStates; } } ////// The allowed effects of drag and drop operation /// public DragDropEffects AllowedEffects { get { return _allowedEffects; } } ////// The effects of drag and drop operation /// public DragDropEffects Effects { get { return _effects; } set { if (!DragDrop.IsValidDragDropEffects(value)) { throw new ArgumentException(SR.Get(SRID.DragDrop_DragDropEffectsInvalid, "value")); } _effects = value; } } #endregion Public Properties #region Protected Methods //----------------------------------------------------- // // Protected Methods // //------------------------------------------------------ ////// The mechanism used to call the type-specific handler on the target. /// /// /// The generic handler to call in a type-specific way. /// /// /// The target to call the handler on. /// protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget) { DragEventHandler handler = (DragEventHandler)genericHandler; handler(genericTarget, this); } #endregion Protected Methods //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields private IDataObject _data; private DragDropKeyStates _dragDropKeyStates; private DragDropEffects _allowedEffects; private DragDropEffects _effects; private DependencyObject _target; private Point _dropPoint; #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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