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When you create a new form with Visual Studio, it generates a custom form class. It doesn t generate any other custom control classes. Instead, Visual Studio relies on events to manage the interaction between controls and your form. Each event you want to handle is added as a separate method in your form class. In other words, every form acts as a giant switchboard for all the controls it contains. This type of design pattern, which is so natural to .NET and most Windows development that you might not have even noticed it, is called the view-mediator pattern. It dictates that one central class organizes each individual window. Using events and the view-mediator pattern, you can rewrite the text box example you saw earlier. In the following example, a form-level event handler reacts to the TextBox.KeyPress event. By specifying the WithEvents keyword in the txtUserName control declaration, you give yourself the option to attach an event handler declaratively. All you need to do is add the Handles clause to the method declaration for the event handler. Here s the complete code: Public Class MainForm Inherits System.Windows.Forms.Form Private WithEvents txtUserName As System.Windows.Forms.TextBox Public Sub New () txtUserName = New System.Windows.Forms.TextBox() txtUserName.Name = "txtUserName" txtUserName.Location = New System.Drawing.Point(64, 88) txtUserName.Size = New System.Drawing.Size(200, 20) txtUserName.TabIndex = 1 txtUserName.Text = "Enter text here!" Controls.Add(txtUserName) End Sub Private Sub txtUserName_KeyPress(ByVal sender As Object, _ ByVal e As System.Windows.Forms.KeyPressEventArgs) _ Handles txtUserName.KeyPress If Not char.IsControl(e.KeyChar) And _ Not char.IsDigit(e.KeyChar) Then e.Handled = True End If End Sub End Class

that need to be implemented The idea behind declaring abstract methods is that it allows a developer to define an intention in a base class that can then be implemented in the subclass In the implementation of HotelCurrencyTrader and ActiveCurrencyTrader, two methods were defined: ConvertTo() and ConvertFrom() A developer could come to the conclusion that the methods are common to both classes, and thus they could be defined in the base class CurrencyTrader That is not a bad idea Let s revisit the CurrencyTrader class and see how these two methods could be added to CurrencyTrader as abstract methods.

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This event occurs when the form will be repainted by Windows; you need to handle this event if you want to take care of drawing the control yourself For more information about this, see the Drawing WinForms section earlier in this chapter This event occurs when the user resizes the form; you could handle this event to adjust the layout of the form to a new size..

... ' Add the top-level container (the ' FlowLayoutPanel or TableLayoutPanel) ' to the table. Dim pnl As Panel = Nothing If Not pnlTable Is Nothing Then pnl = pnlTable Else pnl = pnlFlow End If pnl.AutoSize = True pnl.Margin = New Padding(7) targetContainer.Controls.Add(pnl) ' Return the container control, so more content can ' be inserted inside it. Return container End Function The CreateContent() method is the last piece of the puzzle. It accepts several pieces of information, creates the corresponding input control, and adds it to the panel. It also performs basic validation by checking that the name of the element matches the expected content. Here s the full code: Private ByVal ByVal Dim Sub CreateContent(ByVal type As PanelTypes, _ elementName As String, ByVal caption As String, _ id As String, ByVal container As Control) ctrl As Control = Nothing

Select Case type Case PanelTypes.TextBoxPanel If elementName <> "TextItem" Then Throw New XmlException("Element " & elementName & " not expected") End If ctrl = New Label() ctrl.Text = caption container.Controls.Add(ctrl) ctrl = New TextBox() ctrl.Name = id ctrl.Dock = DockStyle.Fill container.Controls.Add(ctrl) Case PanelTypes.GroupSelectionPanel If elementName <> "SelectionItem" Then Throw New XmlException("Element " & elementName & " not expected") End If ctrl = New RadioButton()

public abstract class CurrencyTrader { private double _exchangeRate; protected double ExchangeRate { get { return _exchangeRate; } set { _exchangeRate = value; } } protected double ConvertValue(double input) { return _exchangeRate * input; } protected double ConvertValueInverse(double input) { return input / _exchangeRate; } public abstract double ConvertTo(double value); public abstract double ConvertFrom(double value); } An abstract method is declared without an implementation, and requires that the class declaring the method(s) be declared as abstract Any class that subclasses CurrencyTrader is required to implement ConvertTo() and ConvertFrom() In the case of HotelCurrencyTrader and ActiveCurrencyTrader, this is not a problem, because the methods are already implemented However, the methods need to be changed slightly, as follows: public override double ConvertTo(double value) { // .. } public override double ConvertFrom(double value) { // ...

ctrl.Name = id ctrl.Text = caption ctrl.Margin = New Padding(3, 0, 3, 0) container.Controls.Add(ctrl) Case PanelTypes.CheckBoxListPanel If elementName <> "SelectionItem" Then Throw New XmlException("Element " & elementName & " not expected") End If CType(container, CheckedListBox).Items.Add( _ New CheckBoxListItem(caption, id)) Case PanelTypes.LargeTextBoxPanel If elementName <> "TextItem" Then Throw New XmlException("Element " & elementName & " not expected") End If ctrl = New TextBox() ctrl.Dock = DockStyle.Fill CType(ctrl, TextBox).WordWrap = True CType(ctrl, TextBox).AcceptsReturn = True CType(ctrl, TextBox).Multiline = True ctrl.Height *= 3 container.Controls.Add(ctrl) End Select End Sub

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