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add (fun _ -> MessageBoxShow("Left button") |> ignore) // return the form temp ApplicationRun(form) Here you use the filter function with a function that checks whether the left-mouse button is pressed; the resulting event is then piped forward to the listen function that adds an event handler to the event, exactly as if you had called the event s Add method You could have implemented this using an if expression within the event handler, but this technique has the advantage of separating the logic that controls the event firing from what happens during the event itself Several event handlers can reuse the new event, depending on your needs Listing 8-3 demonstrates how to use more of Event s functions to create a simple drawing application (see Figure 8-5).

public string FromCurrency { get { return _fromCurrency; } } public string ToCurrency { get { return _toCurrency; } } public double ConvertTo(double value) { double realExchange = ExchangeRate; ExchangeRate = realExchange - _spread; double retval = ConvertValue(value); ExchangeRate = realExchange; return retval; } public double ConvertFrom(double value) { double realExchange = ExchangeRate; ExchangeRate = realExchange + _spread; double retval = ConvertValueInverse(value); ExchangeRate = realExchange; return retval; } } The ConvertTo() and ConvertFrom() methods have the added logic in that the spread will be added or subtracted from the exchange rate. The methods read the current exchange rate, assign it to a temporary variable, define a new exchange rate taking into account the spread, calculate the currency, and then reassign the exchange rate. The ConvertTo() and ConvertFrom() methods swap values to achieve the desired calculations. There is absolutely nothing wrong with doing this, and you will often swap values in your own code. What is important is to restrict access on what classes can do this. Because ExchangeRate is a property with protected access, it means only those classes that subclass can assign and change the value of ExchangeRate. And this implies that the class doing the subclassing knows what it is doing to the data. It is a valid assumption and one that you can use to your benefit. The caller is not aware of this swapping, because HotelCurrencyTrader is taking advantage of the object-oriented technique to not expose the state of the type. That s it we re finished with the currency exchange application. For the remainder of this chapter, I will fill in some extra details that are important.

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Figure 21-20. A more-detailed list of settings To create this window, you simply need to add a third AutoSize column. You can then dock a newly created button in the column, as shown here: Dim cmd As New Button() cmd.Text = "Browse..." cmd.Width = 60 tableLayoutPanel1.Controls.Add(cmd) One other frill is added the entire TableLayoutPanel is made scrollable by setting AutoScroll to True.

You can extend the technique shown in the previous example to create more a customizable user interface that s built out of a collection of TableLayoutPanel and FlowLayoutPanel objects. Doing so allows you to create more sophisticated, variable interfaces, like those that model business forms. The following example demonstrates one such example with a survey application.

Some details about preprocessor directives, properties, and the abstract keyword that did not come up in this chapter s example are worth mentioning. These are things you should know about when writing your own code.

In this application, the code reads XML tags that define the required interface. These tags are stored in a file, although you could easily modify the code so that it reads a block of XML from another source, like a database. The code then loops through the elements in the XML document, translating them into the appropriate controls. As the control objects are created, they re added to the form. This logic is fairly involved, but it s not nearly as messy as it would have been with .NET 1.x. That s because the code uses autosizing and layout panels to avoid dealing directly with control sizes and position. As long as the control is added to the right container, the entire form flows without a problem. The basic structure of the form is made up of two pieces: A TableLayoutPanel with one column holds all the sections of the survey form. The TableLayoutPanel has a single column, with a width of 100 percent. Each section of the survey form is inserted as another panel (either a TableLayoutPanel or a FlowLayoutPanel depending on the type of content). This panel control is placed in a separate cell. The top-level TableLayout is also placed into an ordinary Panel container. This extra step is one approach to add a border around the TableLayoutPanel without adding a border between cells. (Another approach would be to perform some custom drawing in response to the Form.Paint event.) Figure 21-21 shows a sample survey form.

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