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Well-defined controls are those that can be highly customized without having to extend the control programmatically or, even worse, to change its source code Now that you ve defined the drawing procedure, you can define the behavior of the control by handling mouse events You restrict the implementation to mouse events, though a key event handler should be provided in order to react to a press of the Enter key override xOnMouseUp (e:MouseEventArgs) = pressed <- false xInvalidate() fireClick() override xOnMouseDown (e:MouseEventArgs) = pressed <- true xInvalidate() The OnMouseDown event simply sets the pressed member and asks the control to repaint by invalidating its content When the mouse is released, the OnMouseUp gets called, and you reset the flag, ask for repaint, and notify the event to registered listeners by using fireClick Controls are usually configured through the assignment of properties.

Business logic includes all business rules, data validation, manipulation, processing, and security for the application. One definition from Microsoft is as follows: The combination of validation edits, login verifications, database lookups, policies, and algorithmic transformations that constitute an enterprise s way of doing business. 1

If you annotate a property with an attribute of type Category, the property will be displayed by Visual Studio in the control property box To show this, you have defined the Text property that exposes the label of the button to the users of the control [<Category("Behavior")>] override xText with get() = text and set(t:string) = text <- t; xInvalidate() You re now ready to test your new control by writing a few lines of F# code as follows: let form = new Form(Visible=true) let c = new OwnerDrawButton(Text="Hello button") cClickAdd(fun _ -> MessageBoxShow("Clicked!") |> ignore) formControlsAdd(c).

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Again, while you may implement validation logic to run in a browser or other external client, that code can t be trusted. You must view the logic that runs under your control in the business layer as being the only real validation logic.

As witnessed by the OwnerDrawButton control example, the structure of a graphic control tends to assume the form of a finite state automaton. Events received by the control make the automaton change its internal state, usually causing an update of its actual display. A well-known model that describes this structure is the Model-View-Controller design pattern. As shown in Figure 11-5, the model organizes a graphical element (either an application or a single control) into three parts: the model, the view, and the controller.

Methods such as getElementById and getElementsByTagName are extremely useful for retrieving information about the structure and content of a document. The DOM is a representation of the document. The information contained in the DOM reflects the information in the document. Once you know how to ask the right questions (using the right methods), you can get the details of any node in the DOM. The DOM is a two-way street. You can query the contents of a document and you can also update the contents of a document. If you change the DOM tree, you will change the document as viewed in a browser. You ve already seen this voodoo in action with setAttribute. Using that method, you can alter an attribute node in the DOM. This change is reflected in the document displayed in the browser. You haven t physically changed the document. If you open the document in a text editor instead of a browser, you won t see a changed attribute. The changes to the document can be seen only when a browser renders the document. This is because the browser is really displaying the DOM tree. As far as the browser is concerned, the DOM tree is the document. Once you understand this, the idea of creating markup on the fly isn t quite so strange. You aren t really creating markup, you re updating the DOM. The key to doing this is to think in the same terms as the DOM. According to the DOM, a document is a tree of nodes. If you want to add to this tree, you need to insert new nodes. If you want to add markup to a document, you need to insert element nodes.

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