Class Expander

Represents a control that displays a header and has a collapsible content window.

Inheritance
System.Object
DependencyObject
UIElement
FrameworkElement
Control
ContentControl
HeaderedContentControl
Expander
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: System.Windows.Controls
Assembly: OpenSilver.Controls.Toolkit.dll
Syntax
[TemplatePart(Name = "ExpanderButton", Type = typeof(ToggleButton))]
public class Expander : HeaderedContentControl, IControl, IFrameworkElement, IUIElement, IDependencyObject

Constructors

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Expander()

Initializes a new instance of the Expander class.

Declaration
public Expander()

Fields

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ExpandDirectionProperty

Identifies the ExpandDirection dependency property.

Declaration
public static readonly DependencyProperty ExpandDirectionProperty
Field Value
Type Description
DependencyProperty

The identifier for the ExpandDirection dependency property.
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IsExpandedProperty

Identifies the IsExpanded dependency property.

Declaration
public static readonly DependencyProperty IsExpandedProperty
Field Value
Type Description
DependencyProperty

The identifier for the IsExpanded dependency property.

Properties

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ExpandDirection

Gets or sets the direction in which the Expander content window opens.

Declaration
public ExpandDirection ExpandDirection { get; set; }
Property Value
Type Description
ExpandDirection

One of the ExpandDirection values that define which direction the content window opens. The default is Down.
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IsExpanded

Gets or sets a value indicating whether the Expander content window is visible.

Declaration
public bool IsExpanded { get; set; }
Property Value
Type Description
System.Boolean

True if the content window is expanded; otherwise, false. The default is false.

Methods

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OnApplyTemplate()

Builds the visual tree for the Expander control when a new template is applied.

Declaration
public override void OnApplyTemplate()
Overrides
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OnCollapsed()

Raises the Collapsed event when the IsExpanded property changes from true to false.

Declaration
protected virtual void OnCollapsed()
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OnCreateAutomationPeer()

Returns a ExpanderAutomationPeer for use by the Silverlight automation infrastructure.

Declaration
protected override AutomationPeer OnCreateAutomationPeer()
Returns
Type Description
AutomationPeer

A ExpanderAutomationPeer object for the Expander.
Overrides
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OnExpanded()

Raises the Expanded event when the IsExpanded property changes from false to true.

Declaration
protected virtual void OnExpanded()
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OnKeyDown(KeyEventArgs)

Provides handling for the KeyDown event.

Declaration
protected override void OnKeyDown(KeyEventArgs e)
Parameters
Type Name Description
KeyEventArgs e

Key event args.
Overrides

Events

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Collapsed

Occurs when the content window of an Expander control closes and only the Header is visible.

Declaration
public event RoutedEventHandler Collapsed
Event Type
Type Description
RoutedEventHandler
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Expanded

Occurs when the content window of an Expander control opens to display both its header and content.

Declaration
public event RoutedEventHandler Expanded
Event Type
Type Description
RoutedEventHandler

Extension Methods