c# .net core barcode generator

c# .net core barcode generator

c# .net core barcode generator

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private void xamlPageList_SelectionChanged(object sender, SelectionChangedEventArgs e) { if (currentPage != null) { currentPage.Visibility = Visibility.Collapsed; } UserControl page = pageDictionary[(string)xamlPageList.SelectedItem]; if (page != null) { currentPage = page; currentPage.Visibility = Visibility.Visible; currentPage.Focus(); } } The only extra work this event handler does is to set the focus to the newly displayed demonstration. This is an effective way to manually handle navigation, though it has one ramification that must be considered before using it. Since the user controls are still present in the visual tree, they can receive events that propagate from a higher source. If multiple user controls are handling some of these events (for example, contacting the server when the application detects it is online), any state you rely on might change without your immediate notice. If you want to avoid this, then the class that implements the custom navigation (XAML_Viewer, in this case) can disconnect user controls from the visual tree and then re-connect them as the user navigates via the selection list. This disconnection and re-connection is done via LayoutRoot. Children.Add and LayoutRoot.Children.Remove. The revised addXamlPage and selection event handler ensure only one demonstration user control is ever located in the Children collection. public void addXamlPage(string friendlyName, UserControl page) { xamlPageList.Items.Add(friendlyName); pageDictionary.Add(friendlyName, page); if (xamlPageList.Items.Count == 1) { // Automatically make first page visible LayoutRoot.Children.Add(page); showPage(page); } }

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## Check for non-numeric characters case $fp_n in ## (minus signs have been removed by this point, ## so we don't need to include them) *[!0-9.]*) return 1 ;; ## Use this in place of the line above if you prefer to ignore (i.e., skip over) ## invalid arguments ## *[!0-9.]*) continue ;; esac ## count the number of decimal places, ## then remove the decimal point and multiply case $fp_n in .*) fp_int= fp_dec=${fp_n# } fp_places=$fp_places$fp_dec fp_n=$fp_dec ;; *.*) fp_dec=${fp_n#*.} fp_int=${fp_n%.*} fp_places=$fp_places$fp_dec fp_n=$fp_int$fp_dec ;; esac ## remove leading zeroes while : do case $fp_n in 0*) fp_n=${fp_n#0} ;; *) break;; esac done ## "Show your work to the teacher" if verbose equals 63 [ ${verbose:-0} -eq 63 ] && printf "%s\n" "total=\$(( $fp_tot * $fp_n ))" ## multiply by the previous total fp_tot=$(( $fp_tot * $fp_n )) ## report any overflow error case $fp_tot in -*) printf "fpmul: overflow error: %s\n" "$fp_tot" >&2 return 1 ;; esac done

private void xamlPageList_SelectionChanged(object sender, SelectionChangedEventArgs e) { UserControl page = pageDictionary[(string)xamlPageList.SelectedItem]; showPage(page); } The showPage method does the dirty work for you: private void showPage(UserControl page) { if (currentPage != null) { LayoutRoot.Children.Remove(currentPage); } currentPage = page; LayoutRoot.Children.Add(page); page.SetValue(Grid.ColumnProperty, 1); page.SetValue(Grid.RowProperty, 0); page.VerticalAlignment = VerticalAlignment.Top; page.Visibility = Visibility.Visible; page.Focus(); } That is basically all there is to implementing a manual navigation scheme. The first approach simply hides and shows the proper user controls to implement navigation from one user interface screen to another, and the latter approach ensures controls not being used are disconnected from the visual tree. Since Silverlight applications can live in the browser, you might be wondering whether it s possible to integrate with the browser s back and forward buttons. This is possible in Silverlight 3 using its navigation framework, but it s also possible to implement this manually. We ll expand on adding this functionality to the manual navigation in 10 when we look at invoking browser functionality from Silverlight. Let s now look closer at the navigation functionality in Silverlight 3 since it will likely be what most developers use for navigation. Another quick sample using the navigation framework is also provided in 15.

Note We kept the modifications to the generator, and we included the lack of versioning and the name

[ ${verbose:-0} -eq 63 ]

There are several important pieces to the navigation framework, including the new Frame class that is in charge of the navigation, the Page class that subjects itself to navigation, the URI mapping for simplifying page references, a journal, and, of course, integration with the host browser s forward and back buttons. We ll explore the navigation framework by taking the XAML_Viewer example and turning it into DemoPresenter, a new user interface that acts as a container for the chapter demonstrations. The navigation framework is located in the System. Windows.Navigation namespace, with supporting controls in the System.Windows.Controls and

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