ObjectFlagProperty<T> class Null safety

A property where the important diagnostic information is primarily whether the value is present (non-null) or absent (null), rather than the actual value of the property itself.

The ifPresent and ifNull strings describe the property value when it is non-null and null respectively. If one of ifPresent or ifNull is omitted, that is taken to mean that level should be DiagnosticLevel.hidden when value is non-null or null respectively.

This kind of diagnostics property is typically used for opaque values, like closures, where presenting the actual object is of dubious value but where reporting the presence or absence of the value is much more useful.

See also:

  • FlagsSummary, which provides similar functionality but accepts multiple flags under the same name, and is preferred if there are multiple such values that can fit into a same category (such as "listeners").
  • FlagProperty, which provides similar functionality describing whether a value is true or false.
Inheritance

Constructors

ObjectFlagProperty(String name, T? value, {String? ifPresent, String? ifNull, bool showName = false, DiagnosticLevel level = DiagnosticLevel.info})
Create a diagnostics property for values that can be present (non-null) or absent (null), but for which the exact value's Object.toString representation is not very transparent (e.g. a callback).
ObjectFlagProperty.has(String name, T? value, {DiagnosticLevel level = DiagnosticLevel.info})
Shorthand constructor to describe whether the property has a value.

Properties

allowNameWrap → bool
Whether to wrap the name onto multiple lines or not.
finalinherited
allowTruncate → bool
Whether to allow truncation when displaying the node and its children.
read-onlyinherited
allowWrap → bool
Whether to wrap text on onto multiple lines or not.
finalinherited
defaultValue → Object?
The default value of this property, when it has not been set to a specific value.
finalinherited
emptyBodyDescription → String?
Description to show if the node has no displayed properties or children.
read-onlyinherited
exception → Object?
Exception thrown if accessing the property value threw an exception.
read-onlyinherited
expandableValue → bool
Whether to expose properties and children of the value as properties and children.
finalinherited
hashCode → int
The hash code for this object.
read-onlyinherited
ifEmpty → String?
Description if the property description would otherwise be empty.
finalinherited
ifNull → String?
Description if the property value is null.
finalinherited
ifPresent → String?
Description to use if the property value is not null.
final
isInteresting → bool
Whether to consider the property's value interesting. When a property is uninteresting, its level is downgraded to DiagnosticLevel.fine regardless of the value provided as the constructor's level argument.
read-onlyinherited
level → DiagnosticLevel
Priority level of the diagnostic used to control which diagnostics should be shown and filtered.
read-onlyoverride
linePrefix → String?
Prefix to include at the start of each line.
finalinherited
missingIfNull → bool
Whether a value of null causes the property to have level DiagnosticLevel.warning warning that the property is missing a value.
finalinherited
name → String?
Label describing the DiagnosticsNode, typically shown before a separator (see showSeparator).
finalinherited
propertyType → Type
The type of the property value.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
showName → bool
Whether the name of the property should be shown when showing the default view of the tree.
read-onlyoverride
showSeparator → bool
Whether to show a separator between name and description.
finalinherited
style → DiagnosticsTreeStyle?
Hint for how the node should be displayed.
finalinherited
textTreeConfiguration → TextTreeConfiguration?
Returns a configuration specifying how this object should be rendered as text art.
protected">@protectedread-onlyinherited
tooltip → String?
Optional tooltip typically describing the property.
finalinherited
value → T?
Returns the value of the property either from cache or by invoking a ComputePropertyValueCallback.
read-onlyinherited

Methods

getChildren() → List<DiagnosticsNode>
Children of this DiagnosticsNode.
inherited
getProperties() → List<DiagnosticsNode>
Properties of this DiagnosticsNode.
inherited
isFiltered(DiagnosticLevel minLevel) → bool
Whether the diagnostic should be filtered due to its level being lower than minLevel.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
toDescription({TextTreeConfiguration? parentConfiguration}) → String
Returns a description with a short summary of the node itself not including children or properties.
inherited
toJsonMap(DiagnosticsSerializationDelegate delegate) → Map<String, Object?>
Serialize the node to a JSON map according to the configuration provided in the DiagnosticsSerializationDelegate.
override
toString({TextTreeConfiguration? parentConfiguration, DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
Returns a string representation of this diagnostic that is compatible with the style of the parent if the node is not the root.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, TextTreeConfiguration? parentConfiguration, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a string representation of this node and its descendants.
inherited
toTimelineArguments() → Map<String, String>?
Converts the properties (getProperties) of this node to a form useful for Timeline event arguments (as in Timeline.startSync).
inherited
valueToString({TextTreeConfiguration? parentConfiguration}) → String
Returns a string representation of the property value.
override

Operators

operator ==(Object other) → bool
The equality operator.
inherited