barcode label printing in vb.net Figure 14-7. A Page inside a NavigationWindow in Font

Generating Data Matrix 2d barcode in Font Figure 14-7. A Page inside a NavigationWindow

Figure 14-7. A Page inside a NavigationWindow
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CHAPTER 14 PAGE NAVIGATION PROGRAMS
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Figure 14-8 illustrates the NavigationService class. The NavigationService object of a navigation host performs the tasks of locating and loading the navigation target.
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Figure 14-8. The NavigationService object The journal keeps track of the navigation history. It consists of two stacks the Back stack and the Forward stack and the logic that governs them, as illustrated in Figure 14-9. The stacks contain journal entries, which are items that contain a set of information about the Pages or items that have been visited.
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Figure 14-9. The journal stacks hold JournalEntry objects.
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CHAPTER 14 PAGE NAVIGATION PROGRAMS
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When the user navigates from one page to another, the journal keeps track of the process by manipulating the stacks as shown in Figure 14-10. New page: A journal entry for the previous page is placed on the Back stack; the new page is loaded as the current page, and the Forward stack is emptied. Backward: A journal entry for the current page is pushed onto the Forward stack, and the top journal entry of the Back stack is popped to become the current page. Forward: A journal entry for the current page is pushed onto the Back stack, and the top journal entry in the Forward stack is popped to become the current page.
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Figure 14-10. The states of the journal
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CHAPTER 14 PAGE NAVIGATION PROGRAMS
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For stand-alone navigation programs, there are two classes that can act as navigation hosts. They are the NavigationWindow class and the Frame class. The NavigationWindow class is derived from the Window class. If you use a NavigationWindow, it must always be the top-level element of its element tree. It acts like a browser. If the compiler sees that the startupUri of a program is a Page, it creates a NavigationWindow to host it. This is why in the previous examples you haven t had to specify the navigation host.
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The Frame class is a ContentControl and is designed to provide navigation inside other Windows or other ContentControls.
Frames
Unlike NavigationWindow, Frame objects can t be used as the top-level navigation host. The following are some other important things to know about Frames: Since Frame is derived from the ContentControl class, you can place Frames wherever you can place a control, including inside other Frame objects. A Frame object can handle its own navigation by producing its own navigation bar. By default it will do this only if it s not inside an enclosing NavigationWindow or Frame.
For example, the screenshots shown in Figure 14-11 show a Frame with a black border inside a normal Window object. There are several important things to note about the screenshots: Initially the Frame does not have a navigation bar, because no navigation has taken place. When the user clicks the Page 2 hyperlink and is taken to Page 2, a navigation bar automatically appears in the Frame itself. After that, the navigation bar remains visible and active.
Figure 14-11. A Frame can supply its own navigation bar.
CHAPTER 14 PAGE NAVIGATION PROGRAMS
Figure 14-12 shows the markup to produce this program. The following are some important things to notice about the markup: The Frame is placed in a standard Window object and is used to navigate between two Page objects. The initial URI of the Frame is set by assigning it to the Source attribute.
Figure 14-12. The markup for the three files that produce the navigation Frame inside a Window
CHAPTER 14 PAGE NAVIGATION PROGRAMS
Journal Options in Frames
In the previous example, you saw that once the user moved from the initial Page, the Frame produced its own navigation bar. This indicates that it s using its own journal. In other situations, however, a Frame s navigation history might be handled by the journal of an enclosing navigation host. The different cases are the following: By default, if a Frame is enclosed by a NavigationWindow or by another Frame with an active journal, its navigation is merged with, and handled by, the enclosing navigation host s journal. If there is no active journal of an enclosing navigation host, the Frame activates its own journal. You can explicitly set the journaling behavior by setting the JournalOwnership property of the Frame to one of the three values shown in Table 14-1.
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