MultiTrigger Class (System.Windows)

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Microsoft Visual Studio 2010/.NET Framework 4

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.NET Framework Class Library

MultiTrigger Class

Represents a trigger that applies property values or performs actions when a set of conditions are satisfied.

Inheritance Hierarchy

System..::.Object
  System.Windows.Threading..::.DispatcherObject
    System.Windows..::.DependencyObject
      System.Windows..::.TriggerBase
        System.Windows..::.MultiTrigger

Namespace: System.Windows
Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

Syntax

Visual Basic

<ContentPropertyAttribute("Setters")> _
Public NotInheritable Class MultiTrigger _
    Inherits TriggerBase _
    Implements IAddChild

[ContentPropertyAttribute("Setters")]
public sealed class MultiTrigger : TriggerBase, 
    IAddChild

Visual C++

[ContentPropertyAttribute(L"Setters")]
public ref class MultiTrigger sealed : public TriggerBase, 
    IAddChild

[<Sealed>]
[<ContentPropertyAttribute("Setters")>]
type MultiTrigger =  
    class
        inherit TriggerBase
        interface IAddChild
    end

XAML Object Element Usage

<MultiTrigger>
  Setters
</MultiTrigger>

The MultiTrigger type exposes the following members.

Constructors

	Name	Description
	MultiTrigger	Initializes a new instance of the MultiTrigger class.

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Properties

	Name	Description
	Conditions	Gets a collection of Condition objects. Changes to property values are applied when all of the conditions in the collection are met.
	DependencyObjectType	Gets the DependencyObjectType that wraps the CLR type of this instance. (Inherited from DependencyObject.)
	Dispatcher	Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)
	EnterActions	Gets a collection of TriggerAction objects to apply when the trigger object becomes active. This property does not apply to the EventTrigger class. (Inherited from TriggerBase.)
	ExitActions	Gets a collection of TriggerAction objects to apply when the trigger object becomes inactive. This property does not apply to the EventTrigger class. (Inherited from TriggerBase.)
	IsSealed	Gets a value that indicates whether this instance is currently sealed (read-only). (Inherited from DependencyObject.)
	Setters	Gets a collection of Setter objects, which describe the property values to apply when all of the conditions of the MultiTrigger are met.

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Methods

	Name	Description
	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.)
	CoerceValue	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.)
	Equals	Determines whether a provided DependencyObject is equivalent to the current DependencyObject. (Inherited from DependencyObject.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	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	Returns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.)
	InvalidateProperty	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.)
	OnPropertyChanged	Invoked whenever the effective value of any dependency property on this DependencyObject has been updated. The specific dependency property that changed is reported in the event data. (Inherited from DependencyObject.)
	ReadLocalValue	Returns the local value of a dependency property, if it exists. (Inherited from DependencyObject.)
	SetCurrentValue	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	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.)

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Explicit Interface Implementations

	Name	Description
	IAddChild..::.AddChild	Adds a child object.
	IAddChild..::.AddText	Adds the text content of a node to the object.

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Remarks

MultiTrigger enables you to set property values or start actions based on a collection of Conditions. A condition is met when the value of the property (specified by the Property property of the Condition class) of the element matches the specified Value. The comparison is a reference equality check. You can then use setters or the EnterActions and ExitActions properties to apply changes or start actions when all of the conditions are met.

The Setters property of a MultiTrigger object can only consist of Setter objects. Adding a Setter child to a MultiTrigger object implicitly adds it to the SetterBaseCollection for the MultiTrigger object. EventSetter objects are not supported; only Style..::.Setters supports EventSetter objects.

Examples

The following example contains two MultiTriggers. The first sets the MinWidth property value when the HasItems property is false and the Width property is Auto. The second one is similar but is for the MinHeight property.

XAML

<Style.Triggers>
  <Trigger Property="IsEnabled" Value="false">
    <Setter Property="Background" Value="#EEEEEE" />
  </Trigger>

  <MultiTrigger>
    <MultiTrigger.Conditions>
      <Condition Property="HasItems" Value="false" />
      <Condition Property="Width" Value="Auto" />
    </MultiTrigger.Conditions>
    <Setter Property="MinWidth" Value="120"/>
  </MultiTrigger>

  <MultiTrigger>
    <MultiTrigger.Conditions>
      <Condition Property="HasItems" Value="false" />
      <Condition Property="Height" Value="Auto" />
    </MultiTrigger.Conditions>
    <Setter Property="MinHeight" Value="95"/>
  </MultiTrigger>
</Style.Triggers>

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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.

Reference

System.Windows Namespace

Trigger

MultiDataTrigger

Other Resources

Styling and Templating

Introduction to Styling and Templating Sample