Changeset 5744 for trunk/sources/HeuristicLab.Core.Views/3.3/ItemListView.cs

Timestamp:

03/18/11 01:38:23 (13 years ago)

Author:

swagner

Message:

Implemented dragging of multiple items in all collection views and refactored drag & drop code (#1112)

File:

• trunk/sources/HeuristicLab.Core.Views/3.3/ItemListView.cs (modified) (3 diffs)

trunk/sources/HeuristicLab.Core.Views/3.3/ItemListView.cs

@@ -21 +21 @@
 
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Drawing;
@@ -37 +38 @@
     protected Dictionary<T, List<ListViewItem>> itemListViewItemMapping;
     protected TypeSelectorDialog typeSelectorDialog;
+    protected bool validDragOperation;
 
     public new IItemList<T> Content {
@@ -277 +279 @@
     protected virtual void itemsListView_ItemDrag(object sender, ItemDragEventArgs e) {
       if (!Locked) {
-        ListViewItem listViewItem = (ListViewItem)e.Item;
-        T item = listViewItem.Tag as T;
-        if (item != null) {
+        List<T> items = new List<T>();
+        foreach (ListViewItem listViewItem in itemsListView.SelectedItems) {
+          T item = listViewItem.Tag as T;
+          if (item != null) items.Add(item);
+        }
+
+        if (items.Count > 0) {
           DataObject data = new DataObject();
-          data.SetData("Type", item.GetType());
-          data.SetData("Value", item);
+          if (items.Count == 1) data.SetData("HeuristicLab", items[0]);
+          else data.SetData("HeuristicLab", items);
           if (Content.IsReadOnly || ReadOnly) {
             DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link);
           } else {
             DragDropEffects result = DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link | DragDropEffects.Move);
-            if ((result & DragDropEffects.Move) == DragDropEffects.Move)
-              Content.RemoveAt(listViewItem.Index);
+            if ((result & DragDropEffects.Move) == DragDropEffects.Move) {
+              foreach (ListViewItem listViewItem in itemsListView.SelectedItems.Cast<ListViewItem>().ToArray()) {
+                if (listViewItem.Tag != null) Content.RemoveAt(listViewItem.Index);
+              }
+            }
           }
         }
       }
     }
-    protected virtual void itemsListView_DragEnterOver(object sender, DragEventArgs e) {
+    protected virtual void itemsListView_DragEnter(object sender, DragEventArgs e) {
+      validDragOperation = false;
+      if (e.Data.GetData("HeuristicLab") is T) {
+        validDragOperation = true;
+      } else if (e.Data.GetData("HeuristicLab") is IEnumerable) {
+        validDragOperation = true;
+        IEnumerable items = (IEnumerable)e.Data.GetData("HeuristicLab");
+        foreach (object item in items)
+          validDragOperation = validDragOperation && (item is T);
+      }
+      validDragOperation = validDragOperation && !Content.IsReadOnly && !ReadOnly;
+    }
+    protected virtual void itemsListView_DragOver(object sender, DragEventArgs e) {
       e.Effect = DragDropEffects.None;
-      Type type = e.Data.GetData("Type") as Type;
-      if (!Content.IsReadOnly && !ReadOnly && (type != null) && (typeof(T).IsAssignableFrom(type))) {
+      if (validDragOperation) {
         if ((e.KeyState & 32) == 32) e.Effect = DragDropEffects.Link;  // ALT key
         else if ((e.KeyState & 4) == 4) e.Effect = DragDropEffects.Move;  // SHIFT key
-        else if ((e.AllowedEffect & DragDropEffects.Copy) == DragDropEffects.Copy) e.Effect = DragDropEffects.Copy;
-        else if ((e.AllowedEffect & DragDropEffects.Move) == DragDropEffects.Move) e.Effect = DragDropEffects.Move;
-        else if ((e.AllowedEffect & DragDropEffects.Link) == DragDropEffects.Link) e.Effect = DragDropEffects.Link;
+        else if (e.AllowedEffect.HasFlag(DragDropEffects.Copy)) e.Effect = DragDropEffects.Copy;
+        else if (e.AllowedEffect.HasFlag(DragDropEffects.Move)) e.Effect = DragDropEffects.Move;
+        else if (e.AllowedEffect.HasFlag(DragDropEffects.Link)) e.Effect = DragDropEffects.Link;
       }
     }
     protected virtual void itemsListView_DragDrop(object sender, DragEventArgs e) {
       if (e.Effect != DragDropEffects.None) {
-        T item = e.Data.GetData("Value") as T;
-        if ((e.Effect & DragDropEffects.Copy) == DragDropEffects.Copy) item = (T)item.Clone();
-
         Point p = itemsListView.PointToClient(new Point(e.X, e.Y));
         ListViewItem listViewItem = itemsListView.GetItemAt(p.X, p.Y);
-        if (listViewItem != null) Content.Insert(listViewItem.Index, item);
-        else Content.Add(item);
+
+        if (e.Data.GetData("HeuristicLab") is T) {
+          T item = (T)e.Data.GetData("HeuristicLab");
+          if (listViewItem != null) Content.Insert(listViewItem.Index, e.Effect.HasFlag(DragDropEffects.Copy) ? (T)item.Clone() : item);
+          else Content.Add(e.Effect.HasFlag(DragDropEffects.Copy) ? (T)item.Clone() : item);
+        } else if (e.Data.GetData("HeuristicLab") is IEnumerable) {
+          IEnumerable<T> items = ((IEnumerable)e.Data.GetData("HeuristicLab")).Cast<T>();
+          foreach (T item in items) {
+            if (listViewItem != null) Content.Insert(listViewItem.Index, e.Effect.HasFlag(DragDropEffects.Copy) ? (T)item.Clone() : item);
+            else Content.Add(e.Effect.HasFlag(DragDropEffects.Copy) ? (T)item.Clone() : item);
+          }
+        }
       }
     }