ThumbButtonInfo Class

Definition

Namespace:

System.Windows.Shell

Assembly:

PresentationFramework.dll

Represents information about how to display a button in the Windows 7 taskbar thumbnail.

public ref class ThumbButtonInfo sealed : System::Windows::Freezable, System::Windows::Input::ICommandSource

public sealed class ThumbButtonInfo : System.Windows.Freezable, System.Windows.Input.ICommandSource

type ThumbButtonInfo = class
    inherit Freezable
    interface ICommandSource

Public NotInheritable Class ThumbButtonInfo
Inherits Freezable
Implements ICommandSource

Inheritance

Object

DispatcherObject

DependencyObject

Freezable

ThumbButtonInfo

Implements

ICommandSource

Examples

The following example shows how to create a ThumbButtonInfo in markup. The TaskbarItemInfo contains a collection of ThumbButtonInfo objects that provide access to the Play and Stop commands from the taskbar item. This example is part of a larger example provided for the TaskbarItemInfo class.

<Window.TaskbarItemInfo>
    <TaskbarItemInfo x:Name="taskBarItemInfo1" 
                     Overlay="{StaticResource ResourceKey=StopImage}"
                     ThumbnailClipMargin="80,0,80,140"
                     Description="Taskbar Item Info Sample">
        <TaskbarItemInfo.ThumbButtonInfos>
            <ThumbButtonInfoCollection>
                <ThumbButtonInfo
                    DismissWhenClicked="False"
                    Command="MediaCommands.Play"
                    CommandTarget="{Binding ElementName=btnPlay}"
                    Description="Play"
                    ImageSource="{StaticResource ResourceKey=PlayImage}"/>
                <ThumbButtonInfo
                    DismissWhenClicked="True"
                    Command="MediaCommands.Stop"
                    CommandTarget="{Binding ElementName=btnStop}"
                    Description="Stop"
                    ImageSource="{StaticResource ResourceKey=StopImage}"/>
            </ThumbButtonInfoCollection>
        </TaskbarItemInfo.ThumbButtonInfos>
    </TaskbarItemInfo>
</Window.TaskbarItemInfo>

Remarks

The Windows 7 taskbar provides enhanced functionality that enables you to use the taskbar button to communicate status to a user and expose common tasks when the window is minimized or hidden. You can add buttons to the taskbar thumbnail to provide access to common tasks without switching to the application window. For example, Windows Media Player provides Play, Pause, Forward, and Back buttons that you can use to control media playback from the taskbar thumbnail when the application is minimized.

The ThumbButtonInfo class contains properties that describe how the Windows 7 shell displays the buttons in the taskbar thumbnail. It provides a managed wrapper around the native Windows API. ThumbButtonInfo objects are contained in the TaskbarItemInfo.ThumbButtonInfos collection.

The enhanced taskbar functionality is not available in versions of Windows earlier than Windows 7. In Windows 7, some functionality might not be available depending on the user's settings. For example, buttons are only shown in the taskbar thumbnail when Windows Aero is enabled. Your application should provide alternate ways of interacting with the user that are not dependent on the enhanced taskbar functionality.

The following illustration shows a taskbar preview with two thumb buttons that provide access to the Play and Stop commands.

Windows Taskbar Thumb Buttons

Constructors

ThumbButtonInfo()

Initializes a new instance of the ThumbButtonInfo class.

Fields

CommandParameterProperty	Identifies the CommandParameter dependency property.
CommandProperty	Identifies the Command dependency property.
CommandTargetProperty	Identifies the CommandTarget dependency property.
DescriptionProperty	Identifies the Description dependency property.
DismissWhenClickedProperty	Identifies the DismissWhenClicked dependency property.
ImageSourceProperty	Identifies the ImageSource dependency property.
IsBackgroundVisibleProperty	Identifies the IsBackgroundVisible dependency property.
IsEnabledProperty	Identifies the IsEnabled dependency property.
IsInteractiveProperty	Identifies the IsInteractive dependency property.
VisibilityProperty	Identifies the Visibility dependency property.

Properties

CanFreeze	Gets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable)
Command	Gets or sets the command to invoke when this thumbnail button is clicked.
CommandParameter	Gets or sets the parameter to pass to the Command property.
CommandTarget	Gets or sets the element on which to raise the specified command.
DependencyObjectType	Gets the DependencyObjectType that wraps the CLR type of this instance. (Inherited from DependencyObject)
Description	Gets or sets the text to display for the thumbnail button tooltip.
DismissWhenClicked	Gets or sets a value that indicates whether the taskbar thumbnail closes when the thumbnail button is clicked.
Dispatcher	Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject)
ImageSource	Gets or sets the image that is displayed on the thumbnail button.
IsBackgroundVisible	Gets or sets a value that indicates whether a border and highlight is displayed around the thumbnail button.
IsEnabled	Gets or sets a value that indicates whether the thumbnail button is enabled.
IsFrozen	Gets a value that indicates whether the object is currently modifiable. (Inherited from Freezable)
IsInteractive	Gets or sets a value that indicates whether the user can interact with the thumbnail button.
IsSealed	Gets a value that indicates whether this instance is currently sealed (read-only). (Inherited from DependencyObject)
Visibility	Gets or sets a value that specifies the display state of the thumbnail button.

Methods

CheckAccess()	Determines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject)
ClearValue(DependencyProperty)	Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject)
ClearValue(DependencyPropertyKey)	Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject)
Clone()	Creates a modifiable clone of the Freezable, making deep copies of the object's values. When copying the object's dependency properties, this method copies expressions (which might no longer resolve) but not animations or their current values. (Inherited from Freezable)
CloneCore(Freezable)	Makes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values. (Inherited from Freezable)
CloneCurrentValue()	Creates a modifiable clone (deep copy) of the Freezable using its current values. (Inherited from Freezable)
CloneCurrentValueCore(Freezable)	Makes the instance a modifiable clone (deep copy) of the specified Freezable using current property values. (Inherited from Freezable)
CoerceValue(DependencyProperty)	Coerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject. (Inherited from DependencyObject)
CreateInstance()	Initializes a new instance of the Freezable class. (Inherited from Freezable)
CreateInstanceCore()	When implemented in a derived class, creates a new instance of the Freezable derived class. (Inherited from Freezable)
Equals(Object)	Determines whether a provided DependencyObject is equivalent to the current DependencyObject. (Inherited from DependencyObject)
Freeze()	Makes the current object unmodifiable and sets its IsFrozen property to true. (Inherited from Freezable)
FreezeCore(Boolean)	Makes the Freezable object unmodifiable or tests whether it can be made unmodifiable. (Inherited from Freezable)
GetAsFrozen()	Creates a frozen copy of the Freezable, using base (non-animated) property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable)
GetAsFrozenCore(Freezable)	Makes the instance a frozen clone of the specified Freezable using base (non-animated) property values. (Inherited from Freezable)
GetCurrentValueAsFrozen()	Creates a frozen copy of the Freezable using current property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable)
GetCurrentValueAsFrozenCore(Freezable)	Makes the current instance a frozen clone of the specified Freezable. If the object has animated dependency properties, their current animated values are copied. (Inherited from Freezable)
GetHashCode()	Gets a hash code for this DependencyObject. (Inherited from DependencyObject)
GetLocalValueEnumerator()	Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject)
GetType()	Gets the Type of the current instance. (Inherited from Object)
GetValue(DependencyProperty)	Returns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject)
InvalidateProperty(DependencyProperty)	Re-evaluates the effective value for the specified dependency property. (Inherited from DependencyObject)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
OnChanged()	Called when the current Freezable object is modified. (Inherited from Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty)	This member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code. (Inherited from Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject)	Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set. (Inherited from Freezable)
OnPropertyChanged(DependencyPropertyChangedEventArgs)	Overrides the DependencyObject implementation of OnPropertyChanged(DependencyPropertyChangedEventArgs) to also invoke any Changed handlers in response to a changing dependency property of type Freezable. (Inherited from Freezable)
ReadLocalValue(DependencyProperty)	Returns the local value of a dependency property, if it exists. (Inherited from DependencyObject)
ReadPreamble()	Ensures that the Freezable is being accessed from a valid thread. Inheritors of Freezable must call this method at the beginning of any API that reads data members that are not dependency properties. (Inherited from Freezable)
SetCurrentValue(DependencyProperty, Object)	Sets the value of a dependency property without changing its value source. (Inherited from DependencyObject)
SetValue(DependencyProperty, Object)	Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject)
SetValue(DependencyPropertyKey, Object)	Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject)
ShouldSerializeProperty(DependencyProperty)	Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property. (Inherited from DependencyObject)
ToString()	Returns a string that represents the current object. (Inherited from Object)
VerifyAccess()	Enforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject)
WritePostscript()	Raises the Changed event for the Freezable and invokes its OnChanged() method. Classes that derive from Freezable should call this method at the end of any API that modifies class members that are not stored as dependency properties. (Inherited from Freezable)
WritePreamble()	Verifies that the Freezable is not frozen and that it is being accessed from a valid threading context. Freezable inheritors should call this method at the beginning of any API that writes to data members that are not dependency properties. (Inherited from Freezable)

Events

Changed	Occurs when the Freezable or an object it contains is modified. (Inherited from Freezable)
Click	Occurs when the thumbnail button is clicked.

See also

• TaskbarItemInfo