public interface AttributeSet
A collection of unique attributes. This is a read-only, immutable interface. An attribute is basically a key and a value assigned to the key. The collection may represent something like a style run, a logical style, etc. These are generally used to describe features that will contribute to some graphical representation such as a font. The set of possible keys is unbounded and can be anything. Typically View implementations will respond to attribute definitions and render something to represent the attributes.
Attributes can potentially resolve in a hierarchy. If a key doesn't resolve locally, and a resolving parent exists, the key will be resolved through the parent.
|Modifier and Type||Interface and Description|
This interface is the type signature that is expected to be present on any attribute key that contributes to character level presentation.
This interface is the type signature that is expected to be present on any attribute key that contributes to presentation of color.
This interface is the type signature that is expected to be present on any attribute key that contributes to the determination of what font to use to render some text.
This interface is the type signature that is expected to be present on any attribute key that contributes to the paragraph level presentation.
static final Object NameAttribute
Attribute name used to name the collection of attributes.
static final Object ResolveAttribute
Attribute name used to identify the resolving parent set of attributes, if one is defined.
Returns the number of attributes that are defined locally in this set. Attributes that are defined in the parent set are not included.
boolean isDefined(Object attrName)
Checks whether the named attribute has a value specified in the set without resolving through another attribute set.
attrName- the attribute name
boolean isEqual(AttributeSet attr)
Determines if the two attribute sets are equivalent.
attr- an attribute set
Returns an attribute set that is guaranteed not to change over time.
Object getAttribute(Object key)
Fetches the value of the given attribute. If the value is not found locally, the search is continued upward through the resolving parent (if one exists) until the value is either found or there are no more parents. If the value is not found, null is returned.
key- the non-null key of the attribute binding
nullif not found
Returns an enumeration over the names of the attributes that are defined locally in the set. Names of attributes defined in the resolving parent, if any, are not included. The values of the
Enumeration may be anything and are not constrained to a particular
This method never returns
null. For a set with no attributes, it returns an empty
boolean containsAttribute(Object name, Object value)
true if this set defines an attribute with the same name and an equal value. If such an attribute is not found locally, it is searched through in the resolving parent hierarchy.
name- the non-null attribute name
value- the value
trueif the set defines the attribute with an equal value, either locally or through its resolving parent
NullPointerException- if either
boolean containsAttributes(AttributeSet attributes)
true if this set defines all the attributes from the given set with equal values. If an attribute is not found locally, it is searched through in the resolving parent hierarchy.
attributes- the set of attributes to check against
trueif this set defines all the attributes with equal values, either locally or through its resolving parent
Gets the resolving parent.
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