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as the access declaration under derived s public heading, j is restored to its public status You can use an access declaration to restore the access rights of public and protected members However, you cannot use an access declaration to raise or lower a member s access status For example, a member declared as private to a base class

Project Design Menu Design Navigation Design Balancing the Bit Budget Asset Preparation The Zen of Subwoofers Slipping Synchronization Preparing Subtitles Preparing Graphics Video Artifacts Putting It All Together (Authoring) Formatting and Output Testing and Quality Control Replication, Duplication, and Distribution Disc Labeling Package Design Production Maxims BD-ROM Production Hybrid Discs 12-14 12-16 12-20 12-23 12-26 12-31 12-32 12-33 12-34 12-37 12-38 12-39 12-40 12-43 12-43 12-43 12-44 12-45 12-47

We should also point out that MDI child forms do not receive the Activated or Deactivate events. As a result, when converting from a single document interface into a multiple document interface, any tasks performed in these events must now be handled via another mechanism. Often the MdiChildActivate event can handle the work previously done in these events. Another option is to use the focus-related events, such as the Enter or Leave event. We will look at the activation events in our MainForm window in a moment. Let s implement an MdiChildActivate event handler to update the title bar for our application.

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UPDATE TITLE BAR IN THE PARENT FORM Action 1 In the ParentForm.cs code window, override the protected OnMdiChildActivate method. Implement this method to set the title bar for the MDI application. In the MainForm.cs code window, add an AlbumTitle property to retrieve the title of the currently displayed album. Result

cannot be made public by a derived class (If C++ allowed this to occur, it would destroy its encapsulation mechanism!) The following program illustrates the access declaration: Notice how this program uses access declarations to restore j, seti( ), and geti( ) to public status

Looking Back at DVD Peering ForwardInto the Digital Fog Beyond Blu-ray The Death of DVD Seeing Double The Changing Face of Home Entertainment The Far Horizon

#include <iostream> using namespace std; class base { int i; // private to base public: int j, k; void seti(int x) { i = x; } int geti() { return i; } }; // Inherit base as private class derived: private base { public: /* The next three statements override base's inheritance as private and restore j, seti(), and geti() to public access */ base::j; // make j public again - but not k base::seti; // make seti() public base::geti; // make geti() public // base::i; // illegal, you cannot elevate access int a; // public }; int main() { derived ob; //obi = 10; // illegal because i is private in derived obj = 20; // legal because j is made public in derived //obk = 30; // illegal because k is private in derived oba = 40; // legal because a is public in derived obseti(10);

protected override void OnMdiChildActivate (System.EventArgs e) { SetTitleBar(); base.OnMdiChildActivate(e); } public string AlbumTitle { get { return _album.Title; } }

cout << obgeti() << " " << obj << " " << oba; return 0; }

UPDATE TITLE BAR IN THE PARENT FORM (continued) Action 4 Back in the ParentForm.cs code window, implement the SetTitleBar method to retrieve the version number for the application. If the active child is a MainForm object, include the album title in the title bar.

Access declarations are supported in C++ to accommodate those situations in which most of an inherited class is intended to be made private, but a few members are to retain their public or protected status ANSI/ISO Standard C++ still allows access declarations, but they are deprecated This means that they are allowed for now, but they might not be supported in the future Instead, the standard suggests achieving the same effect by applying the using keyword

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protected void SetTitleBar() { Version ver = new Version(Application.ProductVersion);