Class Viewbox

Defines a content decorator that can stretch and scale a single child to fill the available space.

Inheritance
System.Object
DependencyObject
UIElement
FrameworkElement
Control
ContentControl
Viewbox
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.dll
Syntax
[TemplatePart(Name = "Child", Type = typeof(ContentPresenter))]
public class Viewbox : ContentControl, IControl, IFrameworkElement, IUIElement, IDependencyObject

Constructors

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Viewbox()

Initializes a new instance of the Viewbox class.

Declaration
public Viewbox()

Fields

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ChildProperty

Identifies the Child dependency property.

Declaration
public static readonly DependencyProperty ChildProperty
Field Value
Type Description
DependencyProperty
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StretchDirectionProperty

Identifies the StretchDirection dependency property.

Declaration
public static readonly DependencyProperty StretchDirectionProperty
Field Value
Type Description
DependencyProperty
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StretchProperty

Identifies the Stretch dependency property.

Declaration
public static readonly DependencyProperty StretchProperty
Field Value
Type Description
DependencyProperty

Properties

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Child

Gets or sets the single child element of a Viewbox element.

Declaration
public UIElement Child { get; set; }
Property Value
Type Description
UIElement

The single child element of a Viewbox element.
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Stretch

Gets or sets the Stretch mode, which determines how content fits into the available space.

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

A Stretch mode, which determines how content fits in the available space. The default is Uniform.
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StretchDirection

Gets or sets the StretchDirection, which determines how scaling is applied to the contents of a Viewbox.

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

A StretchDirection, which determines how scaling is applied to the contents of a Viewbox. The default is Both.

Methods

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ArrangeOverride(Size)

Arranges the content of a Viewbox element. Viewbox always sets the child to its desired size. It then computes and applies a transformation from that size to the space available: Viewbox's own input size less child margin.

Declaration
protected override Size ArrangeOverride(Size finalSize)
Parameters
Type Name Description
Size finalSize

The Size this element uses to arrange its child content.
Returns
Type Description
Size

The Size that represents the arranged size of this Viewbox element and its child.
Overrides
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MeasureOverride(Size)

Measures the child element of a Viewbox to prepare for arranging it during the ArrangeOverride pass.

Declaration
protected override Size MeasureOverride(Size availableSize)
Parameters
Type Name Description
Size availableSize

An upper limit Size that should not be exceeded.
Returns
Type Description
Size

The target Size of the element.
Overrides
Remarks

Viewbox measures it's child at an infinite constraint; it allows the child to be however large it so desires. The child's returned size will be used as it's natural size for scaling to Viewbox's size during Arrange.

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OnApplyTemplate()

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

Declaration
public override void OnApplyTemplate()
Overrides
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OnSizeChanged(Object, SizeChangedEventArgs)

Declaration
protected virtual void OnSizeChanged(object sender, SizeChangedEventArgs e)
Parameters
Type Name Description
System.Object sender
SizeChangedEventArgs e

Extension Methods