winforms data matrix Working with Controls in WinForms in Font

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Working with Controls in WinForms
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A control is simply a class that derives from System.Windows.Forms.Control. Any class that derives from this can be displayed in a form by adding it to the Controls collection on the form object.
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You ll now look at a way to draw the tree using controls. The WinForms library defines a TreeView class, which is specifically for displaying tree-like structures, so you ll use this control to display the tree. To use TreeView, you create an instance of it and configure it by setting its properties and calling its methods. Most important, you add to its Nodes collection the nodes you want to display. Once the control is ready to be displayed, you add it to the form s Controls collection. The TreeView class uses TreeNode objects to represent nodes, so you ll define the function mapTreeToTreeNode to recursively walk the tree structure and create a TreeNode graph. The program in Listing 8-2 produces the tree in Figure 8-3. Listing 8-2. Drawing a Tree via a TreeView Control #light open System.Windows.Forms // The tree type type 'a Tree = | Node of 'a Tree * 'a Tree | Leaf of 'a // The definition of the tee let tree = Node( Node( Leaf "one", Node(Leaf "two", Leaf "three")), Node( Node(Leaf "four", Leaf "five"), Leaf "six")) // A function to transform our tree into a tree of controls let mapTreeToTreeNode t = let rec mapTreeToTreeNodeInner t (node : TreeNode) = match t with | Node (l, r) -> let newNode = new TreeNode("Node") node.Nodes.Add(newNode) |> ignore mapTreeToTreeNodeInner l newNode mapTreeToTreeNodeInner r newNode | Leaf x -> node.Nodes.Add(new TreeNode(any_to_string x)) |> ignore let root = new TreeNode("Root") mapTreeToTreeNodeInner t root root
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// create the form object let form = let temp = new Form() let treeView = new TreeView(Dock = DockStyle.Fill) treeView.Nodes.Add(mapTreeToTreeNode tree) |> ignore treeView.ExpandAll() temp.Controls.Add(treeView) temp Application.Run(form)
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Figure 8-3. A TreeView control used to view a tree This code is about half the length of Listing 8-1, when you drew the tree yourself. It is also more functional, because it allows you to fold away parts of the tree in which you re not interested. This greatly improves the size of tree that can be manageably displayed. In this example, you use the dock style to control how the control looks. You do this by setting the control s Dock property with a member of the DockStyle enumeration. Docking means that the control will take up as much space as available in the form that contains it on the left side if you use DockStyle.Left, on the right side if you use DockStyle.Right, at the top if you use DockStyle.Top, on the bottom if you use DockStyle.Bottom, and on the whole form if you use DockStyle.Fill. This is great when you have just a few controls, because it creates a nice dynamic effect because the controls are resized when the user resizes the form; however, it does not work well with a lot of controls because it is difficult to get lots of controls to fit together nicely using this technique. For example, if you have two controls that are docked to the left, it s confusing which one is supposed to be the leftmost one and how much of the left side they both take up. A better solution with a lot of controls is to explicitly control their layout using the Top and Left properties. You can create a dynamic effect by using the Anchor property to anchor the control to the edge of the containing form. The following example creates a form with a single textbox on it that will grow and shrink as the user resizes the form:
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