AvaloniaObject Class

Definition

Namespace:Avalonia

Assembly:Avalonia.Base

Package:Avalonia

Source:AvaloniaObject.cs

An object with Avalonia.AvaloniaProperty support.

public class AvaloniaObject

Inheritance: object -> AvaloniaObject

Derived types: Animatable, Animation, KeyFrame, KeySpline, TransitionBase, Application, ChartAnnotation, ChartPlotBand, ChartTechnicalIndicator, ColorMapping, FlowEdge, FlowGroup, FlowNode, MapCircle, MapLatLng, MapLayer, MapLine, MapMarker, MapPolygon, MapPolyline, ParallelAxis, ScaleBreak, Trendline, DefinitionBase, NativeMenu, NativeMenuItemBase, FlyoutBase, PipsPagerTemplateSettings, SplitViewTemplateSettings, ProgressBar.ProgressBarTemplateSettings, ResourceProvider, TrayIcon, TreeDataGridColumn, KeyBinding, Drawing, DrawingImage, ExperimentalAcrylicMaterial, Geometry, GradientStop, CroppedBitmap, PathFigure, PathSegment, Pen, TextDecoration, StyleBase, Styles, AvnPropertyHelper.Grid

Implements: IAvaloniaObjectDebug, INotifyPropertyChanged

Remarks

This class is analogous to DependencyObject in WPF.

Constructors

Name	Description
AvaloniaObject	Initializes a new instance of the Avalonia.AvaloniaObject class.

AvaloniaObject Constructor

Initializes a new instance of the Avalonia.AvaloniaObject class.

public AvaloniaObject()

Methods

Name	Description
Bind (8 overloads)	Binds a Avalonia.AvaloniaProperty to an Avalonia.Data.BindingBase.
CheckAccess	Returns a value indicating whether the current thread is the UI thread.
ClearValue (4 overloads)	Clears a Avalonia.AvaloniaProperty's local value.
CoerceValue	Coerces the specified Avalonia.AvaloniaProperty.
Equals	Compares two objects using reference equality.
GetBaseValue	No summary available.
GetHashCode	Gets the hash code for the object.
GetValue (3 overloads)	Gets a Avalonia.AvaloniaProperty value.
IsAnimating	Checks whether a Avalonia.AvaloniaProperty is animating.
IsSet	Checks whether a Avalonia.AvaloniaProperty is set on this object.
SetCurrentValue (2 overloads)	Sets the value of a dependency property without changing its value source.
SetValue (3 overloads)	Sets a Avalonia.AvaloniaProperty value.
VerifyAccess	Checks that the current thread is the UI thread and throws if not.

Bind overloads

Bind Method

Binds a Avalonia.AvaloniaProperty to an Avalonia.Data.BindingBase.

public Avalonia.Data.BindingExpressionBase Bind(Avalonia.AvaloniaProperty property, Avalonia.Data.BindingBase binding)

Parameters

property Avalonia.AvaloniaProperty

The property.

binding Avalonia.Data.BindingBase

The binding.

Returns

Avalonia.Data.BindingExpressionBase

The binding expression which represents the binding instance on this object.

Bind Method

public IDisposable Bind(Avalonia.AvaloniaProperty property, IObservable<object> source, Avalonia.Data.BindingPriority priority)

Parameters

property Avalonia.AvaloniaProperty

source IObservable<object>

priority Avalonia.Data.BindingPriority

Returns

IDisposable

Bind Method

public IDisposable Bind<T>(Avalonia.DirectPropertyBase<TValue><T> property, IObservable<Avalonia.Data.BindingValue<T><T>> source)

Parameters

property Avalonia.DirectPropertyBase<TValue><T>

source IObservable<Avalonia.Data.BindingValue<T><T>>

Type Parameters

T

Returns

IDisposable

Bind Method

public IDisposable Bind<T>(Avalonia.DirectPropertyBase<TValue><T> property, IObservable<object> source)

Parameters

property Avalonia.DirectPropertyBase<TValue><T>

source IObservable<object>

Type Parameters

T

Returns

IDisposable

Bind Method

public IDisposable Bind<T>(Avalonia.DirectPropertyBase<TValue><T> property, IObservable<T> source)

Parameters

property Avalonia.DirectPropertyBase<TValue><T>

source IObservable<T>

Type Parameters

T

Returns

IDisposable

Bind Method

public IDisposable Bind<T>(Avalonia.StyledProperty<TValue><T> property, IObservable<Avalonia.Data.BindingValue<T><T>> source, Avalonia.Data.BindingPriority priority)

Parameters

property Avalonia.StyledProperty<TValue><T>

source IObservable<Avalonia.Data.BindingValue<T><T>>

priority Avalonia.Data.BindingPriority

Type Parameters

T

Returns

IDisposable

Bind Method

public IDisposable Bind<T>(Avalonia.StyledProperty<TValue><T> property, IObservable<object> source, Avalonia.Data.BindingPriority priority)

Parameters

property Avalonia.StyledProperty<TValue><T>

source IObservable<object>

priority Avalonia.Data.BindingPriority

Type Parameters

T

Returns

IDisposable

Bind Method

public IDisposable Bind<T>(Avalonia.StyledProperty<TValue><T> property, IObservable<T> source, Avalonia.Data.BindingPriority priority)

Parameters

property Avalonia.StyledProperty<TValue><T>

source IObservable<T>

priority Avalonia.Data.BindingPriority

Type Parameters

T

Returns

IDisposable

CheckAccess Method

Returns a value indicating whether the current thread is the UI thread.

public bool CheckAccess()

Returns

bool

true if the current thread is the UI thread; otherwise false.

ClearValue overloads

ClearValue Method

Clears a Avalonia.AvaloniaProperty's local value.

public void ClearValue(Avalonia.AvaloniaProperty property)

Parameters

property Avalonia.AvaloniaProperty

The property.

ClearValue Method

public void ClearValue<T>(Avalonia.AvaloniaProperty<TValue><T> property)

Parameters

property Avalonia.AvaloniaProperty<TValue><T>

Type Parameters

T

ClearValue Method

public void ClearValue<T>(Avalonia.DirectPropertyBase<TValue><T> property)

Parameters

property Avalonia.DirectPropertyBase<TValue><T>

Type Parameters

T

ClearValue Method

public void ClearValue<T>(Avalonia.StyledProperty<TValue><T> property)

Parameters

property Avalonia.StyledProperty<TValue><T>

Type Parameters

T

CoerceValue Method

Coerces the specified Avalonia.AvaloniaProperty.

public void CoerceValue(Avalonia.AvaloniaProperty property)

Parameters

property Avalonia.AvaloniaProperty

The property.

Equals Method

Compares two objects using reference equality.

public bool Equals(object obj)

Parameters

obj object

The object to compare.

Returns

bool

Remarks

Overriding Equals and GetHashCode on an AvaloniaObject is disallowed for two reasons:

• AvaloniaObjects are by their nature mutable
• The presence of attached properties means that the semantics of equality are difficult to define

See https://github.com/AvaloniaUI/Avalonia/pull/2747 for the discussion that prompted this.

GetBaseValue Method

public Avalonia.Data.Optional<T><T> GetBaseValue<T>(Avalonia.StyledProperty<TValue><T> property)

Parameters

property Avalonia.StyledProperty<TValue><T>

Type Parameters

T

Returns

Avalonia.Data.Optional<T><T>

GetHashCode Method

Gets the hash code for the object.

public int GetHashCode()

Returns

int

Remarks

Overriding Equals and GetHashCode on an AvaloniaObject is disallowed for two reasons:

• AvaloniaObjects are by their nature mutable
• The presence of attached properties means that the semantics of equality are difficult to define

See https://github.com/AvaloniaUI/Avalonia/pull/2747 for the discussion that prompted this.

GetValue overloads

GetValue Method

Gets a Avalonia.AvaloniaProperty value.

public object GetValue(Avalonia.AvaloniaProperty property)

Parameters

property Avalonia.AvaloniaProperty

The property.

Returns

object

The value.

GetValue Method

public T GetValue<T>(Avalonia.DirectPropertyBase<TValue><T> property)

Parameters

property Avalonia.DirectPropertyBase<TValue><T>

Type Parameters

T

Returns

T

GetValue Method

public T GetValue<T>(Avalonia.StyledProperty<TValue><T> property)

Parameters

property Avalonia.StyledProperty<TValue><T>

Type Parameters

T

Returns

T

IsAnimating Method

Checks whether a Avalonia.AvaloniaProperty is animating.

public bool IsAnimating(Avalonia.AvaloniaProperty property)

Parameters

property Avalonia.AvaloniaProperty

The property.

Returns

bool

True if the property is animating, otherwise false.

IsSet Method

Checks whether a Avalonia.AvaloniaProperty is set on this object.

public bool IsSet(Avalonia.AvaloniaProperty property)

Parameters

property Avalonia.AvaloniaProperty

The property.

Returns

bool

True if the property is set, otherwise false.

Remarks

Returns true if property is a styled property which has a value assigned to it or a binding targeting it; otherwise false.

SetCurrentValue overloads

SetCurrentValue Method

Sets the value of a dependency property without changing its value source.

public void SetCurrentValue(Avalonia.AvaloniaProperty property, object value)

Parameters

property Avalonia.AvaloniaProperty

The property.

value object

The value.

Remarks

This method is used by a component that programmatically sets the value of one of its own properties without disabling an application's declared use of the property. The method changes the effective value of the property, but existing data bindings and styles will continue to work.

The new value will have the property's current Avalonia.Data.BindingPriority, even if that priority is Avalonia.Data.BindingPriority.Unset or Avalonia.Data.BindingPriority.Inherited.

SetCurrentValue Method

public void SetCurrentValue<T>(Avalonia.StyledProperty<TValue><T> property, T value)

Parameters

property Avalonia.StyledProperty<TValue><T>

value T

Type Parameters

T

SetValue overloads

SetValue Method

Sets a Avalonia.AvaloniaProperty value.

public IDisposable SetValue(Avalonia.AvaloniaProperty property, object value, Avalonia.Data.BindingPriority priority)

Parameters

property Avalonia.AvaloniaProperty

The property.

value object

The value.

priority Avalonia.Data.BindingPriority

The priority of the value.

Returns

IDisposable

SetValue Method

public void SetValue<T>(Avalonia.DirectPropertyBase<TValue><T> property, T value)

Parameters

property Avalonia.DirectPropertyBase<TValue><T>

value T

Type Parameters

T

SetValue Method

public IDisposable SetValue<T>(Avalonia.StyledProperty<TValue><T> property, T value, Avalonia.Data.BindingPriority priority)

Parameters

property Avalonia.StyledProperty<TValue><T>

value T

priority Avalonia.Data.BindingPriority

Type Parameters

T

Returns

IDisposable

VerifyAccess Method

Checks that the current thread is the UI thread and throws if not.

public void VerifyAccess()

Properties

Name	Description
Dispatcher	Returns the Avalonia.AvaloniaObject.Dispatcher that this Avalonia.AvaloniaObject is associated with.
Item	No summary available.

Dispatcher Property

Returns the Avalonia.AvaloniaObject.Dispatcher that this Avalonia.AvaloniaObject is associated with.

public Avalonia.Threading.Dispatcher Dispatcher { get; set; }

Item Property

public Avalonia.Data.BindingBase Item { get; set; }

Events

Name	Description
PropertyChanged	Raised when a Avalonia.AvaloniaProperty value changes on this object.

PropertyChanged Event

Raised when a Avalonia.AvaloniaProperty value changes on this object.

public event EventHandler<Avalonia.AvaloniaPropertyChangedEventArgs> PropertyChanged