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The FormWindowState enumeration specifies the possible display states for a Form on the desktop or within an MDI application. This enumeration is part of the System.Windows.Forms namespace. Maximized The form is maximized so that it fills the entire possible display area, either the entire desktop or the entire display window when the form is an MDI child form. The form is minimized and is listed in the task bar or at the base of the MDI container form. The form appears in its normal state. By default, the form is visible and not maximized. If a maximized Form is minimized, then setting the Form to Normal will return the form to a maximized state.

In this case, b = a performs the assignment operation If = is not overloaded (as it is not here), a bitwise copy will be made Therefore, in some cases, you may need to overload the = operator as well as create a copy constructor to avoid problems

We also use the BringToFront method to display the form at the top of the z-order within the MDI container This method is part of the Control class and can be used to adjust the z-order position of any Windows Forms control within its container There is also a corresponding SendToBack method to place a control at the bottom of the z-order Run the application to verify this feature works Try minimizing or maximizing the form before opening the same album to verify that the proper behavior occurs Also verify that when a new album is selected, a new MDI child form appears as before This completes the three tasks we set out at the start of section 164.

When a base class is inherited as private, all public and protected members of that class become private members of the derived class However, in certain circumstances, you may want to restore one or more inherited members to their original access specification

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For example, you might want to grant certain public members of the base class public status in the derived class even though the base class is inherited as private You have two ways to accomplish this First, you can use a using statement, and this is the preferred way The using statement, designed primarily to support namespaces, is discussed later in this chapter The second way to restore an inherited member s access specification is to employ an access declaration within the derived class Access declarations are currently supported by ANSI/ISO Standard C++, but they are deprecated This means that they should not be used for new code Since there are still many existing programs that use access declarations, they will be examined here An access declaration takes this general form: base-class::member; The access declaration is put under the appropriate access heading in the derived class s declaration Notice that no type declaration is required (or, indeed, allowed) in an access declaration To see how an access declaration works, let s begin with this short fragment:

We have added a toolbar to our parent form and hidden the toolbar in the child, turned the PixelDlg form into an MDI child when running as an MDI application, and ensured that an album can only be opened within a single MDI child form As a final change, and to create a slightly more polished application, let s make one more addition here to place the current album in the title bar 1644 UPDATING THE TITLE BAR An MDI application should normally update its title bar to reflect the contents of the currently active child form This provides good feedback to your users, especially when the application is minimized and only appears in the task bar In our case, we will also include the version number on the title bar as is our custom The result of this change is shown in figure 168.

class base { public: int j; // public in base }; // Inherit base as private class derived: private base { public: // here is access declaration base::j; // make j public again };

We could like to update the title bar whenever a new form is activated within the MDI container There is an event for just this purpose, namely the MdiChildActivate event This event occurs whenever an MDI child form is closed or becomes the active form within the container..

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Because base is inherited as private by derived, the public member j is made a private member of derived However, by including

base::j;

Figure 16.8 The title bar for our MDI application must handle the various types of child forms the application can display.