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let w = new Window(Topmost=true) w.Show() let c = new Canvas() w.Content <- c let r = new Rectangle(Width=100.,Height=100.,RadiusX=5., RadiusY=5.,Stroke=Brushes.Black)
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CHAPTER 11 BUILDING GRAPHICAL USER INTERFACES
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c.Children.Add(r) let e = new Ellipse(Width=150.,Height=150.,Stroke=Brushes.Black) c.Children.Add(e) Canvas.SetLeft(e, 100.) Canvas.SetTop(e, 100.) e.MouseLeftButtonUp.Add(fun _ -> e.Fill <if e.Fill = (Brushes.Yellow :> Brush) then Brushes.Red else Brushes.Yellow ) At first, this example doesn t differ much from the one showing a button in a window: you create a Canvas object, which is a container for multiple UI elements, and add two graphic objects. In the Windows Form world, you d think of two graphic controls used for drawing, although they wouldn t blend because each traditional window is opaque. In fact, these two graphics primitives are represented by two objects and are retained by the presentation system; pick correlation and event dispatching are guaranteed by the graphical toolkit. Note that the ellipse is an outline, so the click event is raised only by clicking the outline; when the fill brush is specified, you can change the fill color by clicking inside the ellipse. Another relevant aspect is the positioning of an element: there is no Left or Top property because it s the responsibility of the container (in this case, the canvas) to lay out contained objects.
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An application can draw any shape by adding graphics primitives to a WPF window s visual tree.3 Because the system retains these primitives, you don t need to implement an event handler for the paint message: it s up to the graphical toolkit to render the tree in the appropriate way whenever needed. Problems such as visible primitives and efficient drawing fade away quickly and are dealt with by the system; nevertheless, you re still responsible for using the visual tree. Because graphics primitives are organized in a tree structure, it s natural to use an XML-based language to initialize this tree with the window s initial state. WPF introduced the XAML language for this purpose; it recalls HTML, though it was designed for defining rich UIs instead of hypertext. The drawing example shown in the previous section can be expressed using the XAML markup in Listing 11-8. Listing 11-8. Example of a Window Definition Using XAML. <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Canvas> <Rectangle Width="100" Height="100" Stroke="Black" RadiusX="5" RadiusY="10"/> <Ellipse Name="Circle" Canvas.Left="100" Canvas.Top="100" Width="150" Height="150" Stroke="Black"/> </Canvas> </Window>
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The visual tree plays a similar role to the DOM tree in Dynamic HTML applications.
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The markup syntax is a wonderful tool for compacting several programming-language statements into a single line, because properties can be set as attributes. XAML adopts a well-defined bridge between the XML elements and the corresponding .NET classes and objects. Tag names are mapped onto classes and implicitly define instances, attributes are used to assign objects properties, and attributes containing a dot are interpreted as static properties (for example, Canvas.Left and Canvas.Top). Each node may have a name, which is useful for retrieving a reference to the node; in this case, the ellipse element is named Circle.
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At the time of writing, the F# project system in Visual Studio 2010 doesn t include full XAML support. This means there is no WPF Visual Studio Wizard for the F# language. For C#, the compilation process for WPF applications involves a precompilation of XAML files in C# source files and an optimized representation of XAML called Binary XAML (BAML). The source-code generation has the goal of making it easier to interact with graphical objects defined within the XAML file using a mechanism successfully employed for ASP.NET files: code behind. Using the special attribute x:Class , you can indicate a class in which to inject the definition of graphical elements of the XAML file, so that C# methods can be referred to through XML attributes (to indicate event handlers) and XAML objects are exposed as fields. It s possible, however, to load XAML at runtime, letting F# applications benefit from the ability to use XAML UI definitions instead of having to manipulate WPF objects explicitly. The following is a simple example of a function that loads XAML markup from a file and, assuming it contains the definition of a window, converts the reference into an instance of the Window class:
open open open open open System.Windows System.Windows.Controls System.Windows.Markup System.Windows.Media System.Xml
let loadXamlWindow (filename:string) = let reader = XmlReader.Create(filename) XamlReader.Load(reader) : > Window let app = new Application() let wnd = loadXamlWindow("Window.xaml")
You can use a WYSIWYG editor for XAML to visually author UIs. To load it in an F# application, you must ensure that the x:Class attribute is removed; otherwise, the Load method will raise an exception. Don t associate event handlers through the UI: they should be explicitly associated inside the F# code. Using these functions, you can load any XAML fragment; in F#, the most common case is to load the definition of a window. Note that it s also possible to parse XAML code embedded in strings: for instance, in the resources embedded in the application or embedded as a string within the program. The rest of this chapter refers to this function without including its definition.
XAML has been rightly touted as separating the world of business logic from that of UI design, offering direct control to graphic designers through XAML and allowing programmers to rely on names to instrument graphical controls. The XAML and the names of graphical elements are the contract between programmers and designers, allowing for concurrent work on GUI application
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