Go back to the method name again and choose the Item/Drag event handler and do this following code. If (e.KeyState And maskctrl) = maskctrl Then ‘CHECKINKG IF THE CTRL KEY WAS PRESSED.Į.Effect = DragDropEffects.Copy ‘PERFORM COPYĮ.Effect = DragDropEffects.Move ‘PERFORM A MOVE If (e.Data.GetDataPresent(“”)) Then ‘CHECKING THE DRAG CONTENT TO BE SURE THAT IT IS THE CORRECT TYPE. Private Sub TreeView_DragEnter(ByVal sender As System.Object, ByVal e As ) Handles trview_left.DragEnter, trview_right.DragEnter Then, click the method name and choose the Drag/Enter events handler, and do this following code.
Nodeorigination.Remove() ‘REMOVE THE NODE If (e.KeyState And maskctrl) maskctrl Then ‘CHECKING THE CTRL KEY WAS NOT PRESSED ‘EMPHASIZE PARENT NOT WHEN ADDING THE NEW NODE, WITHOUT THIS, ONLY THE a+ SYMBOL WILL APPEAR. If Not distination_node.TreeView Is nodeorigination.TreeView Thenĭistination_(CType(nodeorigination.Clone, TreeNode))
#TREEVIEW VISUAL BASIC.NET CODE#
‘THIS CODE INSURES THAT IT WILL NOT HAPPEN. ‘IF THE ORIGINAL NODE AND DISTINATION NODE ARE THE SAME, THE THE NODE WOULD DISAPPEAR. ‘THEN THE RESULT OF THE DESTINATIONNODE WILL BE NOTHING ‘IF THE NEW NODE WAS NOT DROPPED DIRECTLY AT THE TOP OF THE NODE, ‘POINT IS USED TO GET THE CLOSEST NODE IN THE DESTINATION TREEVIEWĭistination_node = CType(sender, TreeView).GetNodeAt(pnt)
Pnt = CType(sender, TreeView).PointToClient(New Point(e.X, e.Y)) ‘POINTTOCLIENT IS USED TO COMPUTE THE LOCATION OF THE MOUSE OVER THE DESTINATION TREEVIEW ‘ONE OF THE GETDATAPRESENT CONTAINS A STRING THAT SPECIFY THE TYPE. ‘THE TREENODE IS NOT INCLUDED IN THE DATAFORMATS CLASS. ‘GETDATAPRESENT IS A BIT DIFFERENT FROM A TREEVIEW AND PICTUREBOX CONTROL. ‘SET A VARIABLE TO HOLDS THE NODE TO BE DRAGGEDĭim nodeorigination As TreeNode = CType(e.Data.GetData(“”), TreeNode) Private Sub TreeView_DragDrop(ByVal sender As System.Object, ByVal e As ) Handles trview_left.DragDrop, trview_right.DragDrop ‘IT IS USED FOR DETECTING THE CTRL KEY WHETHER THE CTRL KEY WAS PRESSED OR NOT DURING THE DRAG OPERATION
#TREEVIEW VISUAL BASIC.NET HOW TO#
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