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• Layout Rounding

  When an object edge falls in the middle of a pixel device, the DPI-independent graphics system can create rendering artifacts, such as blurry or semi-transparent edges. Previous versions of WPF included pixel snapping to help handle this case. Silverlight 2 introduced layout rounding, which is another way to move elements so that edges fall on whole pixel boundaries. WPF now supports layout rounding with the UseLayoutRounding attached property on FrameworkElement.

• Cached Composition

  By using the new BitmapCache and BitmapCacheBrush classes, you can cache a complex part of the visual tree as a bitmap and greatly improve rendering time. The bitmap remains responsive to user input, such as mouse clicks, and you can paint it onto other elements just like any brush.

• Pixel Shader 3 Support

  WPF 4 builds on top of the ShaderEffect support introduced in WPF 3.5 SP1 by allowing applications to now write effects by using Pixel Shader (PS) version 3.0. The PS 3.0 shader model is more sophisticated than PS 2.0, which allows for even more effects on supported hardware.

• Easing Functions

  You can enhance animations with easing functions, which give you additional control over the behavior of animations. For example, you can apply an ElasticEase to an animation to give the animation a springy behavior. For more information, see the easing types in the System.Windows.Media.Animation namespace.

• New Text Rendering Stack

  The WPF text rendering stack has been completely replaced. This change brings improvements to text rendering configurability, clarity, and support for international languages. The new text stack now supports explicitly selecting aliased, grayscale, or ClearType rendering modes. The text stack now supports display-optimized character layout, to produce text with sharpness comparable to Win32/GDI text. The new text stack allows optimizing text hinting and snapping for either animated or static text. The new text stack also supports fonts with embedded bitmaps to be substituted for smaller font sizes, allowing many East Asian fonts to render with sharpness comparable to Win32/GDI text.

• Selection and Caret Customization

  You can now specify the brush that paints the selection and caret for input and reading controls, such as TextBoxRichTextBox, and FlowDocumentReader. There are two new properties on TextBoxBase:

  • SelectionBrush allows you to create a brush for highlighting selected text.

  • CaretBrush allows you to change the brush that paints the cursor.

• Bind to commands on InputBinding.

  You can bind the Command property of an InputBinding class to an instance that is defined in code. The following properties are dependency properties, so that they can be targets of bindings:

  • InputBinding.Command

  • InputBinding.CommandParameter

  • InputBinding.CommandTarget

  • KeyBinding.Key

  • KeyBinding.Modifiers

  • MouseBinding.MouseAction

  The InputBinding, MouseBinding, and KeyBinding classes receive data context from the owning FrameworkElement.

• Bind to Dynamic Objects

  WPF supports data binding to objects that implement IDynamicMetaObjectProvider. For example, if you create a dynamic object that inherits from DynamicObject in code, you can use markup extension to bind to the object in XAML. For more information, see the Binding Sources Overview.

• Bindable Text Run

  Run.Text is now a dependency property. The main advantage is that it now supports one-way bindings. It also supports other features of dependency properties, such as styling and templating.

Two features have been added to XAML browser applications (XBAPs).

• HTML-XBAP Script Interop

  You can now communicate with the Web page containing the XBAP when the application is hosted in a HTML frame. The XBAP can get deep access to the HTML DOM and can handle DOM events. For more information see BrowserInteropHelper.HostScript.

• Full-Trust XBAP Deployment

  If your XBAP requires full trust, the user will now automatically receive the standard ClickOnce elevation prompt when they install the application from the intranet or one of their browser's trusted sites.

For more information on both these features, see WPF XAML Browser Applications Overview.

WPF dialog boxes on Windows 7 and Windows Vista now support the look and feel of the Windows 7 and Windows Vista style, which includes custom places. For more information, see the FileDialogCustomPlace class.