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By default, all classes can be inherited. When creating classes that can be inherited, you must take care that they are not modified in such a way that derived classes no longer function as intended. If you are not careful, you can create complex inheritance chains that are hard to manage and debug. For example, suppose you create a derived CheckingAccount class based on the Account class. Another programmer can come along and create a derived class based on the CheckingAccount and use it in ways you never intended. (This could easily occur in large programming teams with poor communication and design.) By using the NotInheritable modifier, you can create classes that you know will not be derived from. This type of class is often referred to as a sealed or final class. By making a class not inheritable, you avoid the complexity and overhead associated with altering the code of base classes. The following code demonstrates the use of the NotInheritable modifier when constructing a class definition: Public NotInheritable Class CheckingAccount

import QtQuick 1.0 Rectangle { height:200 width: 200 color: "red" }

You also have the option of wrapping document text around the table. For business proposals, you should turn text wrapping off. You can specify margins for text within the cell and padding between the cells. This allows you to space your data nicely across the page. To access these controls, shown in Figure 8-31, click the Options button.

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The first line simply instructs the QML interpreter to include the definitions provided by QtQuick 1.0; you can provide your own QML files to import as well, or import JavaScript to provide better separation between your user interface and business logic. This QML defines a single object, a Rectangle. All QML objects are specified first by their type and then the properties of the object as name-value pairs separated by a single colon. Type names are capitalized, just like class names in C++. Here, we ve written the properties one at a time, but we can put them on the same line and separate them with a semicolon, like this:

When setting up class hierarchies using inheritance, you must manage how the properties and methods of your classes are accessed. Two access modifiers you have looked at so far are Public and Private. If a method or property of the base class is exposed as Public, it is accessible by both the derived class and any client of the derived class. If you expose the property or method of the base class as Private, it is not accessible directly by the derived class or the client. You may want to expose a property or method of the base class to a derived class, but not to a client of the derived class. In this case, you use the Protected access modifier. The following code demonstrates the use of the Protected access modifier:

import QtQuick 1.0 Rectangle { height:200; width: 200; color: "red" }

If you want to add borders or shading to cells, click the Borders and Shading button. On the Borders tab, select the border style, color, and width (see Figure 8-32). There are border presets that will apply the border style you choose to specific areas of the table. Or, you can click in the diagram on the right to specify where you want the borders to appear.

Protected Function GetBalance() As Double 'Code to retrieve account balance from database End Function By defining the GetBalance method as Protected, it becomes accessible to the derived class CheckingAccount but not to the client code accessing an instance of the CheckingAccount class.

Which you use is mostly a matter of personal preference for readability; we find that closely related properties requiring little explanation say, the dimensions of an object can be snuggled together on a single line. More important definitions, or those that require additional thought, should probably be placed on their own line and include a comment, like this:

import QtQuick 1.0 Rectangle { height:200; width: 200 // Required by Sandy s UX documentation as of 5 November. color: "red" }

To specify shading, open the Shading tab, as shown in Figure 8-33. Select the color you would like to apply from the color chart. For more options, click More Colors. In the Patterns sections, you can select a shading pattern. Finally, click OK.

In this activity, you will become familiar with the following: Creating a base class and derived classes Using access modifiers in the base class Creating an abstract base class

Comments are written with standard C++ and JavaScript syntax, using either /* and */ for a block comment, or // to indicate that everything that follows until the beginning of the next line is a comment. Values assigned to properties can be computed, too, using JavaScript syntax. For example, to create a rectangle whose width is twice its height, I might write:

import QtQuick 1.0 Rectangle { id: myRectangle height: 200 width: myRectangle.height * 2 color: "red" }

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