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return _exchangeRate * input; } protected double ConvertValueInverse(double input) { return input / _exchangeRate; } } The new class ActiveCurrencyTrader subclasses CurrencyTrader and is written as follows: public class ActiveCurrencyTrader : CurrencyTrader { } The data member CurrencyTrader_exchangeRate is declared as private, and thus can be referenced only in CurrencyTrader If _exchangeRate had no declaration, private scope would be implied For example, the following code would not compile public class ActiveCurrencyTrader : CurrencyTrader { public void Method() { _exchangeRate = 1000; } } The ActiveCurrencyTrader class is not part of CurrencyTrader, and thus _exchangeRate cannot be referenced Considering the ActiveCurrencyTrader class, ExchangeRate, which has been declared as protected, could be referenced as follows: public class ActiveCurrencyTrader : CurrencyTrader { public void Method() { ExchangeRate = 1000; } } Protected scope means only those classes that derive from a class can view the methods, properties, or data members.

Public Overrides Function Layout(ByVal container As Object, _ ByVal layoutEventArgs As LayoutEventArgs) As Boolean parent = TryCast(container, Control) Dim y As Integer = 0 For Each ctrl As Control In parent.Controls y += Margin ' For maximum efficiency, set the ' size and location in one step through ' the Bounds property. ctrl.Bounds = New Rectangle(Margin, y, parent.Width - Margin * 2, Margin) Next ' Return true if the layout should be performed again ' by the parent. Return parent.AutoSize End Function This code implements the same logic you saw earlier each control is spaced out in a separate line. You can easily choose to take other properties (such as the parent s padding, and the margins or anchor settings of each child control) into account. The final step is to connect this layout engine to a control. You can do this only by deriving a new control class and assigning to the LayoutEngine property. For example, you could create a derived panel control or user control that uses this technique. But the easiest test is to change the layout manager of a form. Because every form you create in Visual Studio is a custom class that derives from Form, you re able to override the LayoutEngine property, as shown here: Private _layoutEngine As SingleLineFlowLayoutEngine Public Overrides ReadOnly Property LayoutEngine() As LayoutEngine Get If _layoutEngine Is Nothing Then ' Create a layout manager that uses a 20-pixel margin. _layoutEngine = New SingleLineFlowLayoutEngine(20) End If Return _layoutEngine End Get End Property Now the controls in this form are automatically laid out by the SingleLineFlowLayoutEngine.

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There are two panel controls for custom layout. The FlowLayoutPanel is the simpler of the two. The FlowLayoutPanel arranges controls one after the other in the available space. It s similar to the approach usually used with web pages, where each element is positioned immediately after the preceding element.

How many times and levels a class subclasses another class is not important Public scope is the loosest and simplest of all scopes You use public whenever you want to expose functionality that other classes or derived classes want to reference Here are some guidelines for using each scope: Private scope: You will use private for most data member declarations because data member declarations imply the state of an object Sometimes, when developing algorithms, you will break apart the logic into several methods The broken-apart methods are used to solve a problem, and thus should be used only in the context of the class, implying the methods need to be declared using private Protected scope: You will use protected whenever you want to enforce an inheritance architecture Very often, protected and abstract go hand in hand, as both are intended for inheritance.

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To try out a FlowLayoutPanel, drag it onto a form and start adding some controls. The FlowLayoutPanel adds two new properties to the Panel class: FlowDirection. This property determines how the controls are laid out in sequence (for example, from top to bottom). Table 21-1 lists the supported values. WrapContents. If True, this allows the layout control to wrap controls once they extend beyond the boundary specified by FlowDirection. For example, if you re laying out items from left to right and you set WrapContents to True, items will be added in a new left-toright row underneath when the first row is full. If WrapContents is False, everything will be added into the first row, but items that extend beyond the boundaries of the panel will be clipped or hidden.

Elements flow from the bottom of the panel to the top. Elements flow from the left edge of the panel to the right. This is the default. Elements flow from the right edge of the panel to the left. Elements flow from the top of the panel to the bottom.

The main objective behind protected is to offer a derived class access to the private state of a parent class, or to offer reusable functionality that should be used only by knowledgeable developers..

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