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-// Copyright (C) Josh Smith - January 2007
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-using System;
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-using System.Collections.ObjectModel;
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-using System.Windows;
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-using System.Windows.Controls;
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-using System.Windows.Controls.Primitives;
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-using System.Windows.Documents;
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-using System.Windows.Input;
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-using System.Windows.Media;
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-using WPF.JoshSmith.Adorners;
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-using WPF.JoshSmith.Controls.Utilities;
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-
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-namespace WPF.JoshSmith.ServiceProviders.UI
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-{
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- #region ListViewDragDropManager
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-
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- /// <summary>
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- /// Manages the dragging and dropping of ListViewItems in a ListView.
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- /// The ItemType type parameter indicates the type of the objects in
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- /// the ListView's items source. The ListView's ItemsSource must be
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- /// set to an instance of ObservableCollection of ItemType, or an
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- /// Exception will be thrown.
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- /// </summary>
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- /// <typeparam name="ItemType">The type of the ListView's items.</typeparam>
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- public class ListViewDragDropManager<ItemType> where ItemType : class
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- {
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- #region Data
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-
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- bool canInitiateDrag;
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- DragAdorner dragAdorner;
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- double dragAdornerOpacity;
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- int indexToSelect;
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- bool isDragInProgress;
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- ItemType itemUnderDragCursor;
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- ListView listView;
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- Point ptMouseDown;
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- bool showDragAdorner;
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-
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- #endregion // Data
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-
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- #region Constructors
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-
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- /// <summary>
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- /// Initializes a new instance of ListViewDragManager.
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- /// </summary>
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- public ListViewDragDropManager()
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- {
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- this.canInitiateDrag = false;
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- this.dragAdornerOpacity = 0.7;
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- this.indexToSelect = -1;
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- this.showDragAdorner = true;
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- }
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-
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- /// <summary>
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- /// Initializes a new instance of ListViewDragManager.
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- /// </summary>
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- /// <param name="listView"></param>
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- public ListViewDragDropManager(ListView listView)
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- : this()
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- {
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- this.ListView = listView;
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- }
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-
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- /// <summary>
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- /// Initializes a new instance of ListViewDragManager.
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- /// </summary>
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- /// <param name="listView"></param>
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- /// <param name="dragAdornerOpacity"></param>
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- public ListViewDragDropManager(ListView listView, double dragAdornerOpacity)
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- : this(listView)
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- {
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- this.DragAdornerOpacity = dragAdornerOpacity;
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- }
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-
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- /// <summary>
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- /// Initializes a new instance of ListViewDragManager.
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- /// </summary>
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- /// <param name="listView"></param>
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- /// <param name="showDragAdorner"></param>
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- public ListViewDragDropManager(ListView listView, bool showDragAdorner)
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- : this(listView)
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- {
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- this.ShowDragAdorner = showDragAdorner;
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- }
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-
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- #endregion // Constructors
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-
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- #region Public Interface
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-
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- #region DragAdornerOpacity
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-
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- /// <summary>
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- /// Gets/sets the opacity of the drag adorner. This property has no
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- /// effect if ShowDragAdorner is false. The default value is 0.7
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- /// </summary>
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- public double DragAdornerOpacity
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- {
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- get { return this.dragAdornerOpacity; }
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- set
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- {
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- if (this.IsDragInProgress)
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- throw new InvalidOperationException("Cannot set the DragAdornerOpacity property during a drag operation.");
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-
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- if (value < 0.0 || value > 1.0)
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- throw new ArgumentOutOfRangeException("DragAdornerOpacity", value, "Must be between 0 and 1.");
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-
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- this.dragAdornerOpacity = value;
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- }
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- }
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-
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- #endregion // DragAdornerOpacity
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-
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- #region IsDragInProgress
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-
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- /// <summary>
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- /// Returns true if there is currently a drag operation being managed.
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- /// </summary>
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- public bool IsDragInProgress
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- {
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- get { return this.isDragInProgress; }
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- private set { this.isDragInProgress = value; }
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- }
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-
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- #endregion // IsDragInProgress
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-
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- #region ListView
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-
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- /// <summary>
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- /// Gets/sets the ListView whose dragging is managed. This property
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- /// can be set to null, to prevent drag management from occuring. If
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- /// the ListView's AllowDrop property is false, it will be set to true.
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- /// </summary>
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- public ListView ListView
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- {
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- get { return listView; }
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- set
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- {
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- if (this.IsDragInProgress)
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- throw new InvalidOperationException("Cannot set the ListView property during a drag operation.");
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-
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- if (this.listView != null)
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- {
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- #region Unhook Events
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-
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- this.listView.PreviewMouseLeftButtonDown -= listView_PreviewMouseLeftButtonDown;
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- this.listView.PreviewMouseMove -= listView_PreviewMouseMove;
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- this.listView.DragOver -= listView_DragOver;
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- this.listView.DragLeave -= listView_DragLeave;
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- this.listView.DragEnter -= listView_DragEnter;
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- this.listView.Drop -= listView_Drop;
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-
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- #endregion // Unhook Events
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- }
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-
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- this.listView = value;
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-
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- if (this.listView != null)
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- {
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- if (!this.listView.AllowDrop)
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- this.listView.AllowDrop = true;
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-
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- #region Hook Events
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-
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- this.listView.PreviewMouseLeftButtonDown += listView_PreviewMouseLeftButtonDown;
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- this.listView.PreviewMouseMove += listView_PreviewMouseMove;
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- this.listView.DragOver += listView_DragOver;
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- this.listView.DragLeave += listView_DragLeave;
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- this.listView.DragEnter += listView_DragEnter;
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- this.listView.Drop += listView_Drop;
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-
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- #endregion // Hook Events
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- }
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- }
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- }
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-
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- #endregion // ListView
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-
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- #region ProcessDrop [event]
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-
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- /// <summary>
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- /// Raised when a drop occurs. By default the dropped item will be moved
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- /// to the target index. Handle this event if relocating the dropped item
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- /// requires custom behavior. Note, if this event is handled the default
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- /// item dropping logic will not occur.
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- /// </summary>
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- public event EventHandler<ProcessDropEventArgs<ItemType>> ProcessDrop;
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-
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- #endregion // ProcessDrop [event]
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-
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- #region ShowDragAdorner
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-
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- /// <summary>
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- /// Gets/sets whether a visual representation of the ListViewItem being dragged
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- /// follows the mouse cursor during a drag operation. The default value is true.
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- /// </summary>
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- public bool ShowDragAdorner
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- {
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- get { return this.showDragAdorner; }
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- set
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- {
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- if (this.IsDragInProgress)
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- throw new InvalidOperationException("Cannot set the ShowDragAdorner property during a drag operation.");
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-
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- this.showDragAdorner = value;
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- }
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- }
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-
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- #endregion // ShowDragAdorner
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-
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- #endregion // Public Interface
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-
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- #region Event Handling Methods
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-
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- #region listView_PreviewMouseLeftButtonDown
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-
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- void listView_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
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- {
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- if (this.IsMouseOverScrollbar)
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- {
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- // 4/13/2007 - Set the flag to false when cursor is over scrollbar.
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- this.canInitiateDrag = false;
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- return;
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- }
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-
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- int index = this.IndexUnderDragCursor;
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- this.canInitiateDrag = index > -1;
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-
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- if (this.canInitiateDrag)
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- {
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- // Remember the location and index of the ListViewItem the user clicked on for later.
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- this.ptMouseDown = MouseUtilities.GetMousePosition(this.listView);
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- this.indexToSelect = index;
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- }
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- else
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- {
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- this.ptMouseDown = new Point(-10000, -10000);
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- this.indexToSelect = -1;
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- }
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- }
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-
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- #endregion // listView_PreviewMouseLeftButtonDown
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-
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- #region listView_PreviewMouseMove
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-
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- void listView_PreviewMouseMove(object sender, MouseEventArgs e)
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- {
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- if (!this.CanStartDragOperation)
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- return;
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-
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- // Select the item the user clicked on.
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- if (this.listView.SelectedIndex != this.indexToSelect)
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- this.listView.SelectedIndex = this.indexToSelect;
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-
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- // If the item at the selected index is null, there's nothing
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- // we can do, so just return;
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- if (this.listView.SelectedItem == null)
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- return;
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-
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- ListViewItem itemToDrag = this.GetListViewItem(this.listView.SelectedIndex);
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- if (itemToDrag == null)
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- return;
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-
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- AdornerLayer adornerLayer = this.ShowDragAdornerResolved ? this.InitializeAdornerLayer(itemToDrag) : null;
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-
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- this.InitializeDragOperation(itemToDrag);
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- this.PerformDragOperation();
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- this.FinishDragOperation(itemToDrag, adornerLayer);
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- }
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-
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- #endregion // listView_PreviewMouseMove
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-
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- #region listView_DragOver
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-
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- void listView_DragOver(object sender, DragEventArgs e)
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- {
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- e.Effects = DragDropEffects.Move;
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-
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- if (this.ShowDragAdornerResolved)
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- this.UpdateDragAdornerLocation();
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-
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- // Update the item which is known to be currently under the drag cursor.
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- int index = this.IndexUnderDragCursor;
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- this.ItemUnderDragCursor = index < 0 ? null : this.ListView.Items[index] as ItemType;
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- }
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-
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- #endregion // listView_DragOver
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-
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- #region listView_DragLeave
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-
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- void listView_DragLeave(object sender, DragEventArgs e)
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- {
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- if (!this.IsMouseOver(this.listView))
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- {
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- if (this.ItemUnderDragCursor != null)
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- this.ItemUnderDragCursor = null;
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-
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- if (this.dragAdorner != null)
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- this.dragAdorner.Visibility = Visibility.Collapsed;
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- }
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- }
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-
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- #endregion // listView_DragLeave
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-
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- #region listView_DragEnter
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-
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- void listView_DragEnter(object sender, DragEventArgs e)
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- {
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- if (this.dragAdorner != null && this.dragAdorner.Visibility != Visibility.Visible)
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- {
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- // Update the location of the adorner and then show it.
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- this.UpdateDragAdornerLocation();
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- this.dragAdorner.Visibility = Visibility.Visible;
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- }
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- }
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-
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- #endregion // listView_DragEnter
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-
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- #region listView_Drop
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-
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- void listView_Drop(object sender, DragEventArgs e)
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- {
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- if (this.ItemUnderDragCursor != null)
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- this.ItemUnderDragCursor = null;
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-
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- e.Effects = DragDropEffects.None;
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-
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- if (!e.Data.GetDataPresent(typeof(ItemType)))
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- return;
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-
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- // Get the data object which was dropped.
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- ItemType data = e.Data.GetData(typeof(ItemType)) as ItemType;
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- if (data == null)
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- return;
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-
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- // Get the ObservableCollection<ItemType> which contains the dropped data object.
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- ObservableCollection<ItemType> itemsSource = this.listView.ItemsSource as ObservableCollection<ItemType>;
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- if (itemsSource == null)
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- throw new Exception(
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- "A ListView managed by ListViewDragManager must have its ItemsSource set to an ObservableCollection<ItemType>.");
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-
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- int oldIndex = itemsSource.IndexOf(data);
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- int newIndex = this.IndexUnderDragCursor;
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-
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- if (newIndex < 0)
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- {
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- // The drag started somewhere else, and our ListView is empty
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- // so make the new item the first in the list.
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- if (itemsSource.Count == 0)
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- newIndex = 0;
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-
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- // The drag started somewhere else, but our ListView has items
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- // so make the new item the last in the list.
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- else if (oldIndex < 0)
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- newIndex = itemsSource.Count;
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-
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- // The user is trying to drop an item from our ListView into
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- // our ListView, but the mouse is not over an item, so don't
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- // let them drop it.
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- else
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- return;
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- }
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-
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- // Dropping an item back onto itself is not considered an actual 'drop'.
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- if (oldIndex == newIndex)
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- return;
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-
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- if (this.ProcessDrop != null)
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- {
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- // Let the client code process the drop.
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- ProcessDropEventArgs<ItemType> args = new ProcessDropEventArgs<ItemType>(itemsSource, data, oldIndex, newIndex, e.AllowedEffects);
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- this.ProcessDrop(this, args);
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- e.Effects = args.Effects;
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- }
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- else
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- {
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- // Move the dragged data object from it's original index to the
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- // new index (according to where the mouse cursor is). If it was
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- // not previously in the ListBox, then insert the item.
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- if (oldIndex > -1)
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- itemsSource.Move(oldIndex, newIndex);
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- else
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- itemsSource.Insert(newIndex, data);
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-
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- // Set the Effects property so that the call to DoDragDrop will return 'Move'.
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- e.Effects = DragDropEffects.Move;
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- }
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- }
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-
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- #endregion // listView_Drop
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-
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- #endregion // Event Handling Methods
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-
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- #region Private Helpers
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-
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- #region CanStartDragOperation
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-
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- bool CanStartDragOperation
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- {
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- get
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- {
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- if (Mouse.LeftButton != MouseButtonState.Pressed)
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- return false;
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-
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- if (!this.canInitiateDrag)
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- return false;
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-
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- if (this.indexToSelect == -1)
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- return false;
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-
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- if (!this.HasCursorLeftDragThreshold)
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- return false;
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-
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- return true;
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- }
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- }
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-
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- #endregion // CanStartDragOperation
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-
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- #region FinishDragOperation
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-
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- void FinishDragOperation(ListViewItem draggedItem, AdornerLayer adornerLayer)
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- {
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- // Let the ListViewItem know that it is not being dragged anymore.
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- ListViewItemDragState.SetIsBeingDragged(draggedItem, false);
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-
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- this.IsDragInProgress = false;
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-
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- if (this.ItemUnderDragCursor != null)
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- this.ItemUnderDragCursor = null;
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-
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- // Remove the drag adorner from the adorner layer.
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- if (adornerLayer != null)
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- {
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- adornerLayer.Remove(this.dragAdorner);
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- this.dragAdorner = null;
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- }
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- }
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-
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- #endregion // FinishDragOperation
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-
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- #region GetListViewItem
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-
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- ListViewItem GetListViewItem(int index)
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- {
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- if (this.listView.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)
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- return null;
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-
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- return this.listView.ItemContainerGenerator.ContainerFromIndex(index) as ListViewItem;
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- }
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-
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- ListViewItem GetListViewItem(ItemType dataItem)
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- {
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- if (this.listView.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)
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- return null;
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-
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- return this.listView.ItemContainerGenerator.ContainerFromItem(dataItem) as ListViewItem;
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- }
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-
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- #endregion // GetListViewItem
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-
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- #region HasCursorLeftDragThreshold
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-
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- bool HasCursorLeftDragThreshold
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- {
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- get
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- {
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- if (this.indexToSelect < 0)
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- return false;
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-
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- ListViewItem item = this.GetListViewItem(this.indexToSelect);
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- Rect bounds = VisualTreeHelper.GetDescendantBounds(item);
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- Point ptInItem = this.listView.TranslatePoint(this.ptMouseDown, item);
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-
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- // In case the cursor is at the very top or bottom of the ListViewItem
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- // we want to make the vertical threshold very small so that dragging
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- // over an adjacent item does not select it.
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- double topOffset = Math.Abs(ptInItem.Y);
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- double btmOffset = Math.Abs(bounds.Height - ptInItem.Y);
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- double vertOffset = Math.Min(topOffset, btmOffset);
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-
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- double width = SystemParameters.MinimumHorizontalDragDistance * 2;
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- double height = Math.Min(SystemParameters.MinimumVerticalDragDistance, vertOffset) * 2;
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- Size szThreshold = new Size(width, height);
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-
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- Rect rect = new Rect(this.ptMouseDown, szThreshold);
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- rect.Offset(szThreshold.Width / -2, szThreshold.Height / -2);
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- Point ptInListView = MouseUtilities.GetMousePosition(this.listView);
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- return !rect.Contains(ptInListView);
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- }
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- }
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-
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- #endregion // HasCursorLeftDragThreshold
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-
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- #region IndexUnderDragCursor
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-
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- /// <summary>
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- /// Returns the index of the ListViewItem underneath the
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- /// drag cursor, or -1 if the cursor is not over an item.
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- /// </summary>
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- int IndexUnderDragCursor
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- {
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- get
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- {
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- int index = -1;
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- for (int i = 0; i < this.listView.Items.Count; ++i)
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- {
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- ListViewItem item = this.GetListViewItem(i);
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- if (this.IsMouseOver(item))
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- {
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- index = i;
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- break;
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- }
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- }
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- return index;
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- }
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- }
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-
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- #endregion // IndexUnderDragCursor
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-
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- #region InitializeAdornerLayer
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-
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- AdornerLayer InitializeAdornerLayer(ListViewItem itemToDrag)
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- {
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- // Create a brush which will paint the ListViewItem onto
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- // a visual in the adorner layer.
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- VisualBrush brush = new VisualBrush(itemToDrag);
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-
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- // Create an element which displays the source item while it is dragged.
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- this.dragAdorner = new DragAdorner(this.listView, itemToDrag.RenderSize, brush);
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-
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- // Set the drag adorner's opacity.
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- this.dragAdorner.Opacity = this.DragAdornerOpacity;
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-
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- AdornerLayer layer = AdornerLayer.GetAdornerLayer(this.listView);
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- layer.Add(dragAdorner);
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-
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- // Save the location of the cursor when the left mouse button was pressed.
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- this.ptMouseDown = MouseUtilities.GetMousePosition(this.listView);
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-
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- return layer;
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- }
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-
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- #endregion // InitializeAdornerLayer
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-
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- #region InitializeDragOperation
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-
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- void InitializeDragOperation(ListViewItem itemToDrag)
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- {
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- // Set some flags used during the drag operation.
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- this.IsDragInProgress = true;
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- this.canInitiateDrag = false;
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-
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- // Let the ListViewItem know that it is being dragged.
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- ListViewItemDragState.SetIsBeingDragged(itemToDrag, true);
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- }
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-
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- #endregion // InitializeDragOperation
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-
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- #region IsMouseOver
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-
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- bool IsMouseOver(Visual target)
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- {
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- // We need to use MouseUtilities to figure out the cursor
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- // coordinates because, during a drag-drop operation, the WPF
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- // mechanisms for getting the coordinates behave strangely.
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-
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- Rect bounds = VisualTreeHelper.GetDescendantBounds(target);
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- Point mousePos = MouseUtilities.GetMousePosition(target);
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- return bounds.Contains(mousePos);
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- }
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-
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- #endregion // IsMouseOver
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-
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- #region IsMouseOverScrollbar
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-
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- /// <summary>
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- /// Returns true if the mouse cursor is over a scrollbar in the ListView.
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- /// </summary>
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- bool IsMouseOverScrollbar
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- {
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- get
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- {
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- Point ptMouse = MouseUtilities.GetMousePosition(this.listView);
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- HitTestResult res = VisualTreeHelper.HitTest(this.listView, ptMouse);
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- if (res == null)
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- return false;
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-
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- DependencyObject depObj = res.VisualHit;
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|
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- while (depObj != null)
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- {
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- if (depObj is ScrollBar)
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- return true;
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-
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- // VisualTreeHelper works with objects of type Visual or Visual3D.
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- // If the current object is not derived from Visual or Visual3D,
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|
|
- // then use the LogicalTreeHelper to find the parent element.
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- if (depObj is Visual || depObj is System.Windows.Media.Media3D.Visual3D)
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- depObj = VisualTreeHelper.GetParent(depObj);
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- else
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- depObj = LogicalTreeHelper.GetParent(depObj);
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|
|
- }
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-
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- return false;
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|
|
- }
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|
|
- }
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-
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- #endregion // IsMouseOverScrollbar
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-
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- #region ItemUnderDragCursor
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-
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- ItemType ItemUnderDragCursor
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|
- {
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- get { return this.itemUnderDragCursor; }
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- set
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|
|
- {
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|
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- if (this.itemUnderDragCursor == value)
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- return;
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-
|
|
|
- // The first pass handles the previous item under the cursor.
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|
- // The second pass handles the new one.
|
|
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- for (int i = 0; i < 2; ++i)
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|
|
- {
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|
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- if (i == 1)
|
|
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- this.itemUnderDragCursor = value;
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-
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|
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- if (this.itemUnderDragCursor != null)
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- {
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- ListViewItem listViewItem = this.GetListViewItem(this.itemUnderDragCursor);
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- if (listViewItem != null)
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- ListViewItemDragState.SetIsUnderDragCursor(listViewItem, i == 1);
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|
- }
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|
|
- }
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|
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- }
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|
|
- }
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-
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- #endregion // ItemUnderDragCursor
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-
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- #region PerformDragOperation
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-
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- void PerformDragOperation()
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|
- {
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- ItemType selectedItem = this.listView.SelectedItem as ItemType;
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- DragDropEffects allowedEffects = DragDropEffects.Move | DragDropEffects.Move | DragDropEffects.Link;
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- if (DragDrop.DoDragDrop(this.listView, selectedItem, allowedEffects) != DragDropEffects.None)
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- {
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|
|
- // The item was dropped into a new location,
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|
- // so make it the new selected item.
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- this.listView.SelectedItem = selectedItem;
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|
|
- }
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|
|
- }
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-
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- #endregion // PerformDragOperation
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-
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- #region ShowDragAdornerResolved
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|
-
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- bool ShowDragAdornerResolved
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- {
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- get { return this.ShowDragAdorner && this.DragAdornerOpacity > 0.0; }
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- }
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-
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- #endregion // ShowDragAdornerResolved
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-
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- #region UpdateDragAdornerLocation
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-
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- void UpdateDragAdornerLocation()
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- {
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- if (this.dragAdorner != null)
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|
- {
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- Point ptCursor = MouseUtilities.GetMousePosition(this.ListView);
|
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|
-
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|
|
- double left = ptCursor.X - this.ptMouseDown.X;
|
|
|
-
|
|
|
- // 4/13/2007 - Made the top offset relative to the item being dragged.
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- ListViewItem itemBeingDragged = this.GetListViewItem(this.indexToSelect);
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|
- Point itemLoc = itemBeingDragged.TranslatePoint(new Point(0, 0), this.ListView);
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|
- double top = itemLoc.Y + ptCursor.Y - this.ptMouseDown.Y;
|
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-
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- this.dragAdorner.SetOffsets(left, top);
|
|
|
- }
|
|
|
- }
|
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|
-
|
|
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- #endregion // UpdateDragAdornerLocation
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|
|
-
|
|
|
- #endregion // Private Helpers
|
|
|
- }
|
|
|
-
|
|
|
- #endregion // ListViewDragDropManager
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|
-
|
|
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- #region ListViewItemDragState
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Exposes attached properties used in conjunction with the ListViewDragDropManager class.
|
|
|
- /// Those properties can be used to allow triggers to modify the appearance of ListViewItems
|
|
|
- /// in a ListView during a drag-drop operation.
|
|
|
- /// </summary>
|
|
|
- public static class ListViewItemDragState
|
|
|
- {
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|
|
- #region IsBeingDragged
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Identifies the ListViewItemDragState's IsBeingDragged attached property.
|
|
|
- /// This field is read-only.
|
|
|
- /// </summary>
|
|
|
- public static readonly DependencyProperty IsBeingDraggedProperty =
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|
|
- DependencyProperty.RegisterAttached(
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|
|
- "IsBeingDragged",
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|
|
- typeof(bool),
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|
|
- typeof(ListViewItemDragState),
|
|
|
- new UIPropertyMetadata(false));
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Returns true if the specified ListViewItem is being dragged, else false.
|
|
|
- /// </summary>
|
|
|
- /// <param name="item">The ListViewItem to check.</param>
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|
|
- public static bool GetIsBeingDragged(ListViewItem item)
|
|
|
- {
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|
|
- return (bool)item.GetValue(IsBeingDraggedProperty);
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Sets the IsBeingDragged attached property for the specified ListViewItem.
|
|
|
- /// </summary>
|
|
|
- /// <param name="item">The ListViewItem to set the property on.</param>
|
|
|
- /// <param name="value">Pass true if the element is being dragged, else false.</param>
|
|
|
- internal static void SetIsBeingDragged(ListViewItem item, bool value)
|
|
|
- {
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|
|
- item.SetValue(IsBeingDraggedProperty, value);
|
|
|
- }
|
|
|
-
|
|
|
- #endregion // IsBeingDragged
|
|
|
-
|
|
|
- #region IsUnderDragCursor
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Identifies the ListViewItemDragState's IsUnderDragCursor attached property.
|
|
|
- /// This field is read-only.
|
|
|
- /// </summary>
|
|
|
- public static readonly DependencyProperty IsUnderDragCursorProperty =
|
|
|
- DependencyProperty.RegisterAttached(
|
|
|
- "IsUnderDragCursor",
|
|
|
- typeof(bool),
|
|
|
- typeof(ListViewItemDragState),
|
|
|
- new UIPropertyMetadata(false));
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Returns true if the specified ListViewItem is currently underneath the cursor
|
|
|
- /// during a drag-drop operation, else false.
|
|
|
- /// </summary>
|
|
|
- /// <param name="item">The ListViewItem to check.</param>
|
|
|
- public static bool GetIsUnderDragCursor(ListViewItem item)
|
|
|
- {
|
|
|
- return (bool)item.GetValue(IsUnderDragCursorProperty);
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Sets the IsUnderDragCursor attached property for the specified ListViewItem.
|
|
|
- /// </summary>
|
|
|
- /// <param name="item">The ListViewItem to set the property on.</param>
|
|
|
- /// <param name="value">Pass true if the element is underneath the drag cursor, else false.</param>
|
|
|
- internal static void SetIsUnderDragCursor(ListViewItem item, bool value)
|
|
|
- {
|
|
|
- item.SetValue(IsUnderDragCursorProperty, value);
|
|
|
- }
|
|
|
-
|
|
|
- #endregion // IsUnderDragCursor
|
|
|
- }
|
|
|
-
|
|
|
- #endregion // ListViewItemDragState
|
|
|
-
|
|
|
- #region ProcessDropEventArgs
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Event arguments used by the ListViewDragDropManager.ProcessDrop event.
|
|
|
- /// </summary>
|
|
|
- /// <typeparam name="ItemType">The type of data object being dropped.</typeparam>
|
|
|
- public class ProcessDropEventArgs<ItemType> : EventArgs where ItemType : class
|
|
|
- {
|
|
|
- #region Data
|
|
|
-
|
|
|
- ObservableCollection<ItemType> itemsSource;
|
|
|
- ItemType dataItem;
|
|
|
- int oldIndex;
|
|
|
- int newIndex;
|
|
|
- DragDropEffects allowedEffects = DragDropEffects.None;
|
|
|
- DragDropEffects effects = DragDropEffects.None;
|
|
|
-
|
|
|
- #endregion // Data
|
|
|
-
|
|
|
- #region Constructor
|
|
|
-
|
|
|
- internal ProcessDropEventArgs(
|
|
|
- ObservableCollection<ItemType> itemsSource,
|
|
|
- ItemType dataItem,
|
|
|
- int oldIndex,
|
|
|
- int newIndex,
|
|
|
- DragDropEffects allowedEffects)
|
|
|
- {
|
|
|
- this.itemsSource = itemsSource;
|
|
|
- this.dataItem = dataItem;
|
|
|
- this.oldIndex = oldIndex;
|
|
|
- this.newIndex = newIndex;
|
|
|
- this.allowedEffects = allowedEffects;
|
|
|
- }
|
|
|
-
|
|
|
- #endregion // Constructor
|
|
|
-
|
|
|
- #region Public Properties
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// The items source of the ListView where the drop occurred.
|
|
|
- /// </summary>
|
|
|
- public ObservableCollection<ItemType> ItemsSource
|
|
|
- {
|
|
|
- get { return this.itemsSource; }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// The data object which was dropped.
|
|
|
- /// </summary>
|
|
|
- public ItemType DataItem
|
|
|
- {
|
|
|
- get { return this.dataItem; }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// The current index of the data item being dropped, in the ItemsSource collection.
|
|
|
- /// </summary>
|
|
|
- public int OldIndex
|
|
|
- {
|
|
|
- get { return this.oldIndex; }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// The target index of the data item being dropped, in the ItemsSource collection.
|
|
|
- /// </summary>
|
|
|
- public int NewIndex
|
|
|
- {
|
|
|
- get { return this.newIndex; }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// The drag drop effects allowed to be performed.
|
|
|
- /// </summary>
|
|
|
- public DragDropEffects AllowedEffects
|
|
|
- {
|
|
|
- get { return allowedEffects; }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// The drag drop effect(s) performed on the dropped item.
|
|
|
- /// </summary>
|
|
|
- public DragDropEffects Effects
|
|
|
- {
|
|
|
- get { return effects; }
|
|
|
- set { effects = value; }
|
|
|
- }
|
|
|
-
|
|
|
- #endregion // Public Properties
|
|
|
- }
|
|
|
-
|
|
|
- #endregion // ProcessDropEventArgs
|
|
|
-}
|
liufei