Simple .NET/ASP.NET PDF document editor web control SDK

Xaml is an XML-based markup language that can be used to construct a user interface Xaml is a former acronym it used to be short for eXtensible Application Markup Language, but as so often happens, for obscure marketing reasons it officially no longer stands for anything And to be fair, most acronyms are reverse-engineered the usual process is to look through the list of unused and pronounceable (it s pronounced Zammel, by the way) three- and four-letter combinations, trying to think of things that the available letters might plausibly stand for Since etymology can t tell us anything useful about what Xaml is, let s look at an example As always, following the examples yourself in Visual Studio is highly encouraged To do that, you ll need to create a new Silverlight project.

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There s a separate section under Visual C# in the New Project dialog for Silverlight projects, and you should choose the Silverlight Application template (Or if you prefer, you can find the WPF Application template in the Windows section underneath Visual C#, although if you choose that, the details will look slightly different from the examples in this chapter) When you create a new Silverlight project, Visual Studio will ask you if you d like it to create a new web project to host the Silverlight application (If you add a Silverlight project to a solution that already contains a web project, it will also offer to associate the Silverlight application with that web project) Silverlight applications run from the web browser (initially, at least), so you ll need a web page simply to run your code.

Then there is the issue of the items being editable by the user. The editable property is controlled at the item level. By using the setEditable(bool) method on each child item shown in the tree view, you make them read-only (see the inner loop for it in Listing 5-6). Listing 5-6. Creating read-only items in a standard item model if( c == 0 ) for( int i=0; i<3; i++ ) { QStandardItem *child = new QStandardItem( QString("Item %1").arg(i) ); child->setEditable( false ); item->appendRow( child ); }

It s not strictly necessary to create a whole web application, because if you choose not to, Visual Studio will just generate a web page automatically when you debug or run the project, but in general, Silverlight projects are an element of a web application, so you d normally want both kinds of projects in your solution Let it create one for now..

If you were building a WPF application, you wouldn t have an associated web project, because WPF is for standalone Windows desktop applications.

Once Visual Studio has created the project, it shows a file called MainPage.xaml. This is a Xaml file defining the appearance and layout of your user interface. Initially, it contains just a couple of elements: a <UserControl> at the root (or a <Window> in a WPF project), and a <Grid> inside this. We ll add a couple of elements to the user interface so that there s something to interact with. Example 20-1 shows the Xaml you get by default with a new Silverlight project, along with two new elements: a Button and a TextBlock; the additional content is shown in bold.

Sometimes it is helpful to limit the ways in which selections can be made. For example, you might want to limit the user to selecting only one item at a time (or to select only entire rows).

<UserControl x:Class="SimpleSilverlight.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480" d:DesignHeight="300" d:DesignWidth="400"> > <Grid x:Name="LayoutRoot" Background="White"> <Button x:Name="myButton" HorizontalAlignment="Center" VerticalAlignment="Top" FontSize="20" Content="Click me!" /> <TextBlock x:Name="messageText" Text="Message will appear here" TextWrapping="Wrap" TextAlignment="Center" FontSize="30" FontWeight="Bold" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Grid> </UserControl>

Visual Studio presents Xaml in a split view. At the top it shows how it looks, and at the bottom it shows the Xaml source. You can either edit the source directly or drag items around on the design view at the top, adding new items from the Toolbox. As you make changes in one view the other view updates automatically.