Thumb Class (System.Windows.Controls.Primitives)

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Microsoft Silverlight 3

Other versions are also available for the following:

.NET Framework Class Library for Silverlight

Thumb Class

Represents a control that can be dragged by the user.

Namespace: System.Windows.Controls.Primitives
Assembly: System.Windows (in System.Windows.dll)

Syntax

Visual Basic (Declaration)

<TemplateVisualStateAttribute(Name := "Normal", GroupName := "CommonStates")> _
<TemplateVisualStateAttribute(Name := "Unfocused", GroupName := "FocusStates")> _
<TemplateVisualStateAttribute(Name := "MouseOver", GroupName := "CommonStates")> _
<TemplateVisualStateAttribute(Name := "Pressed", GroupName := "CommonStates")> _
<TemplateVisualStateAttribute(Name := "Disabled", GroupName := "CommonStates")> _
<TemplateVisualStateAttribute(Name := "Focused", GroupName := "FocusStates")> _
Public NotInheritable Class Thumb _
    Inherits Control

Visual Basic (Usage)

Dim instance As Thumb

[TemplateVisualStateAttribute(Name = "Normal", GroupName = "CommonStates")]
[TemplateVisualStateAttribute(Name = "Unfocused", GroupName = "FocusStates")]
[TemplateVisualStateAttribute(Name = "MouseOver", GroupName = "CommonStates")]
[TemplateVisualStateAttribute(Name = "Pressed", GroupName = "CommonStates")]
[TemplateVisualStateAttribute(Name = "Disabled", GroupName = "CommonStates")]
[TemplateVisualStateAttribute(Name = "Focused", GroupName = "FocusStates")]
public sealed class Thumb : Control

XAML Object Element Usage

<Thumb .../>

Remarks

The Thumb control is usually included in another control, such as a ScrollBar or Slider control, to let the user change the control's value. The Thumb can also be used to resize controls. For example, a Thumb control in the corner of a window can provide a location for the user to click with the mouse to start a resize operation.

Thumb provides DragStarted, DragCompleted and DragDelta events to manage drag operations associated with the mouse pointer. The Thumb control receives logical focus and mouse capture when the user presses the left mouse button while the mouse pointer is paused over the Thumb. When the Thumb control receives logical focus and mouse capture, the DragStarted event is raised. While the Thumb control has logical focus and mouse capture, the DragDelta event can be raised repeatedly. When the user releases the left mouse button, the Thumb control loses mouse capture and the DragCompleted event is raised.

Inheritance Hierarchy

System..::.Object
  System.Windows..::.DependencyObject
    System.Windows..::.UIElement
      System.Windows..::.FrameworkElement
        System.Windows.Controls..::.Control
          System.Windows.Controls.Primitives..::.Thumb

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Reference

Thumb Members

System.Windows.Controls.Primitives Namespace