* TreeView.cs: Hookup the bits for drag and drop.

svn path=/trunk/mcs/; revision=52523

diff --git a/mcs/class/Managed.Windows.Forms/System.Windows.Forms/TreeView.cs b/mcs/class/Managed.Windows.Forms/System.Windows.Forms/TreeView.cs
index 7ecb15a70863d7e810311964887c11479057d472..963164e0cbb86ff6b6980f3d5152619af30215fc 100644 (file)
--- a/mcs/class/Managed.Windows.Forms/System.Windows.Forms/TreeView.cs
+++ b/mcs/class/Managed.Windows.Forms/System.Windows.Forms/TreeView.cs
@@ -96,6 +96,8 @@ namespace System.Windows.Forms {
                private StringFormat string_format;
                private int open_node_count = -1;
 
+               private int drag_begin_x = 0;
+               private int drag_begin_y = 0;
                private long handle_count = 1;
 
                #endregion      // Fields
@@ -633,7 +635,13 @@ namespace System.Windows.Forms {
                                e.Handled = true;
                        }
                }
-               
+
+               protected virtual void OnItemDrag (ItemDragEventArgs e)
+               {
+                       if (ItemDrag != null)
+                               ItemDrag (this, e);
+               }
+
                protected virtual void OnAfterCheck (TreeViewEventArgs e) {
                        if (on_after_check != null)
                                on_after_check (this, e);
@@ -1366,6 +1374,10 @@ namespace System.Windows.Forms {
                }
 
                private void MouseUpHandler (object sender, MouseEventArgs e) {
+
+                       drag_begin_x = -1;
+                       drag_begin_y = -1;
+
                        if (!select_mmove)
                                return;
                                
@@ -1394,6 +1406,27 @@ namespace System.Windows.Forms {
                }
 
                private void MouseMoveHandler (object sender, MouseEventArgs e) {
+
+                       if (e.Button == MouseButtons.Left || e.Button == MouseButtons.Right) {
+                               if (drag_begin_x == -1 && drag_begin_y == -1) {
+                                       drag_begin_x = e.X;
+                                       drag_begin_y = e.Y;
+                               } else {
+                                       double rise = Math.Pow (drag_begin_x - e.X, 2);
+                                       double run = Math.Pow (drag_begin_y - e.Y, 2);
+                                       double move = Math.Sqrt (rise + run);
+                                       if (move > 3) {
+                                               TreeNode drag = GetNodeAt (e.X, e.Y);
+                                               
+                                               if (drag != null) {
+                                                       OnItemDrag (new ItemDragEventArgs (e.Button, drag));
+                                               }
+                                               drag_begin_x = -1;
+                                               drag_begin_y = -1;
+                                       }
+                               }
+                               
+                       }
                        if(!select_mmove)
                                return;
                        TreeNode node = GetNodeAt(e.X,e.Y);
@@ -1422,6 +1455,8 @@ namespace System.Windows.Forms {
                #endregion      // Internal & Private Methods and Properties
 
                #region Events
+               public event ItemDragEventHandler ItemDrag;
+
                public event TreeViewEventHandler AfterCheck {
                        add { on_after_check += value; }
                        remove { on_after_check -= value; }