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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.
Nested Class Summary | |
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static interface |
This interface is the type signature that is expected to be present on any attribute key that contributes to character level presentation. |
static interface |
This interface is the type signature that is expected to be present on any attribute key that contributes to presentation of color. |
static interface |
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. |
static interface |
This interface is the type signature that is expected to be present on any attribute key that contributes to the paragraph level presentation. |
Field Summary | |
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static Object |
NameAttribute
Attribute name used to name the collection of attributes. |
static Object |
ResolveAttribute
Attribute name used to identify the resolving parent set of attributes, if one is defined. |
Method Summary | |
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boolean |
containsAttribute(Object name, Object value) Returns if this set defines an attribute with the same name and an equal value. |
boolean |
containsAttributes(AttributeSet attributes) Returns if this set defines all the attributes from the given set with equal values. |
AttributeSet |
Returns an attribute set that is guaranteed not to change over time. |
Object |
getAttribute(Object key) Fetches the value of the given attribute. |
int |
Returns the number of attributes that are defined locally in this set. |
Enumeration |
Returns an enumeration over the names of the attributes that are defined locally in the set. |
AttributeSet |
Gets the resolving parent. |
boolean |
Checks whether the named attribute has a value specified in the set without resolving through another attribute set. |
boolean |
isEqual(AttributeSet attr) Determines if the two attribute sets are equivalent. |
Field Detail |
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public static final Object NameAttribute
public static final Object ResolveAttribute
Method Detail |
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public boolean containsAttribute(Object name, Object value)
name
- the non-null attribute namevalue
- the valuepublic boolean containsAttributes(AttributeSet attributes)
attributes
- the set of attributes to check againstpublic AttributeSet copyAttributes()
public Object getAttribute(Object key)
key
- the non-null key of the attribute bindingpublic int getAttributeCount()
public Enumeration getAttributeNames()
Enumeration
may be anything and are not constrained to
a particular Object
type.
This method never returns {@code null}. For a set with no attributes, it returns an empty {@code Enumeration}.
public AttributeSet getResolveParent()
public boolean isDefined(Object attrName)
attrName
- the attribute namepublic boolean isEqual(AttributeSet attr)
attr
- an attribute set
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