silverbladetech: Chronosv2/source/DragAndDrop/DropHelper.cs comparison

comparison Chronosv2/source/DragAndDrop/DropHelper.cs @ 10:443821e55f06

Initial cleaned up add from Codeplex files

author	stevenh7776 stevenhollidge@hotmail.com
date	Tue, 21 Feb 2012 17:25:44 +0700
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-:904a9faadf8b
+:443821e55f06
+using System;
+using System.Collections;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using Chronos.Presentation.Core.VirtualDesktops;
+using Chronos.Presentation.Core.Widgets;
+using Chronos.Presentation.ViewModel;
+using Chronos.Presentation.Windows.Controls;
+using nRoute.Services;
+using nRoute.SiteMaps;
+namespace Chronos.Presentation.DragAndDrop
+{
+public sealed class DropHelper
+{
+#region · Consts ·
+const string UrlDataFormat = "text/x-moz-url";
+#endregion
+#region · Fields ·
+private UIElement       dropTarget = null;
+private string[]        datatypes  = { typeof(UIElement).ToString(), "Text" };
+private DragDropEffects allowedEffects;
+#endregion
+#region · Properties ·
+public string[] AllowedDataTypes
+{
+get { return this.datatypes; }
+set
+{
+this.datatypes = value;
+for (int x = 0; x < this.datatypes.Length; x++)
+{
+this.datatypes[x] = this.datatypes[x].ToLower();
+}
+}
+}
+public DragDropEffects AllowedEffects
+{
+get { return this.allowedEffects; }
+set { this.allowedEffects = value; }
+}
+#endregion
+#region · Constructors ·
+public DropHelper(UIElement wrapper)
+{
+this.dropTarget = wrapper;
+this.dropTarget.AllowDrop  = true;
+this.dropTarget.DragOver   += new DragEventHandler(DropTarget_DragOver);
+this.dropTarget.Drop       += new DragEventHandler(DropTarget_Drop);
+}
+#endregion
+#region · DropTarget Event Handlers ·
+private void DropTarget_Drop(object sender, DragEventArgs e)
+{
+IDataObject     data            = e.Data;
+DragDataWrapper dw              = null;
+bool            isDataOperation = false;
+Debug.Assert(data != null);
+if (data.GetDataPresent(typeof(DragDataWrapper).ToString()))
+{
+dw = data.GetData(typeof(DragDataWrapper).ToString()) as DragDataWrapper;
+Debug.Assert(dw.Shim != null);
+if ((dw.Shim.SupportedActions & DragDropProviderActions.Data) != 0)
+{
+isDataOperation = true;
+}
+}
+// Try a BRUTE FORCE APPROACH on UIElement just to show how it could be done
+// BUT NOT ENDORSING IT!!!
+if (!isDataOperation)
+{
+if (this.dropTarget is Canvas)
+{
+if (e.Data.GetDataPresent(DataFormats.FileDrop))
+{
+this.DropFileLink(e);
+}
+else if (e.Data.GetDataPresent(UrlDataFormat))
+{
+this.DropUrl(e);
+}
+}
+}
+else
+{
+Debug.Assert(dw != null);
+Debug.Assert(dw.Shim != null);
+object rawdata = dw.Data;
+if (this.dropTarget is ItemsControl)
+{
+this.DropItemsControlHandler(e, rawdata);
+}
+else if (dropTarget is Canvas)
+{
+if (rawdata is IWidget)
+{
+this.DropCanvasWidget(e, rawdata as IWidget);
+}
+else if (rawdata is SiteMapNode)
+{
+this.DropCanvasInternalLink(e, rawdata as NavigationNode);
+}
+}
+}
+e.Handled = true;
+}
+private void DropTarget_DragOver(object sender, DragEventArgs e)
+{
+string[]    types = e.Data.GetFormats();
+bool        match = false;
+if (datatypes == null || types == null)
+{
+//TODO: ??? Should we set for DragDropEffects.None?
+return;
+}
+foreach (string s in types)
+{
+foreach (string type in datatypes)
+{
+match = (s.ToLower() == type);
+if (match)
+{
+break;
+}
+}
+if (match)
+{
+break;
+}
+}
+if (match)
+{
+e.Effects = AllowedEffects;
+e.Handled = true;
+}
+}
+#endregion
+#region · Drop Handlers Methods ·
+private void DropCanvasWidget(DragEventArgs e, IWidget dropObject)
+{
+ServiceLocator.GetService<IVirtualDesktopManager>()
+.Show
+(
+dropObject.CreateView() as WidgetElement,
+e.GetPosition(this.dropTarget)
+);
+}
+private void DropItemsControlHandler(DragEventArgs e, object rawdata)
+{
+ItemsControl    ic      = this.dropTarget as ItemsControl;
+IList           list    = ic.ItemsSource as IList;
+if (list == null)
+{
+list = ic.Items as System.Collections.IList;
+}
+if (list != null)
+{
+if (!list.Contains(rawdata))
+{
+// Here we do not check for Move | Copy ... because this is a DATA operation .. No parent relationshop at all ...
+list.Add(rawdata);
+}
+else
+{
+// nothing was done ...
+e.Effects = DragDropEffects.None;
+}
+}
+else
+{
+e.Effects = DragDropEffects.None;
+}
+}
+private void DropFileLink(DragEventArgs e)
+{
+// External link drop
+Point       position    = e.GetPosition(this.dropTarget);
+string[]    filenames   = e.Data.GetData(DataFormats.FileDrop, true) as string[];
+e.Effects = DragDropEffects.Link;
+foreach (string filename in filenames)
+{
+ServiceLocator.GetService<IVirtualDesktopManager>()
+.CreateShortcut<ExternalShortcutViewModel>
+(
+Path.GetFileNameWithoutExtension(filename), filename, position
+);
+}
+}
+private void DropUrl(DragEventArgs e)
+{
+// External link drop
+Point   position    = e.GetPosition(this.dropTarget);
+String  data        = null;
+using (MemoryStream stream = e.Data.GetData(UrlDataFormat, true) as MemoryStream)
+{
+using (StreamReader reader = new StreamReader(stream, Encoding.Unicode))
+{
+data = reader.ReadToEnd().Replace("\0", "");
+}
+}
+if (!String.IsNullOrEmpty(data))
+{
+string[] elements = data.Split('\n');
+e.Effects = DragDropEffects.Link;
+if (!String.IsNullOrWhiteSpace(elements[0]) &&
+!String.IsNullOrWhiteSpace(elements[1]))
+{
+ServiceLocator.GetService<IVirtualDesktopManager>()
+.CreateShortcut<ExternalShortcutViewModel>
+(
+elements[1],
+elements[0],
+position
+);
+}
+}
+}
+private void DropCanvasInternalLink(DragEventArgs e, NavigationNode siteMapNode)
+{
+Point position = e.GetPosition(this.dropTarget);
+ServiceLocator.GetService<IVirtualDesktopManager>()
+.CreateShortcut<InternalShortcutViewModel>
+(
+siteMapNode.Title,
+siteMapNode.Url,
+position
+);
+}
+#endregion
+#region · Private Methods ·
+private bool Unparent(DragDataWrapper dw, UIElement uie)
+{
+bool success = false;
+if (dw != null)
+{
+if (dw.AllowChildrenRemove)
+{
+dw.Shim.UnParent();
+}
+}
+if (!success) // BRUTE FORCE
+{
+if (uie is FrameworkElement)
+{
+FrameworkElement fe = uie as FrameworkElement;
+if (fe.Parent != null)
+{
+if (fe.Parent is Panel)
+{
+try
+{
+((Panel)(fe.Parent)).Children.Remove(uie);
+success = true;
+}
+catch (Exception)
+{
+#if DEBUG
+System.Diagnostics.Debug.Assert(false);
+#endif
+}
+}
+}
+else if (fe.Parent is ContentControl)
+{
+ContentControl cc = fe.Parent as ContentControl;
+cc.Content  = null;
+success     = true;
+}
+}
+}
+return success;
+}
+#endregion
+}
+}

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comparison Chronosv2/source/DragAndDrop/DropHelper.cs @ 10:443821e55f06