On Tue, 28 Nov 2023 23:34:30 GMT, Andy Goryachev <ango...@openjdk.org> wrote:
>> Provide a public utility method for use by custom and core Nodes to simplify
>> boilerplate around styleable properties as well as to save some memory.
>>
>>
>> /**
>> * Utility method which combines {@code CssMetaData} items in one
>> immutable list.
>> * <p>
>> * The intended usage is to combine the parent and the child CSS meta
>> data for
>> * the purposes of {@code getClassCssMetaData()} method, see for example
>> {@link Node#getClassCssMetaData()}.
>> * <p>
>> * Example:
>> * <pre>
>> * private static final List<CssMetaData<? extends Styleable, ?>>
>> STYLEABLES = CssMetaData.combine(
>> * <Parent>.getClassCssMetaData(),
>> * STYLEABLE1,
>> * STYLEABLE2
>> * );
>> * </pre>
>> * This method returns an instance of {@link java.util.RandomAccess}
>> interface.
>> *
>> * @param list the css metadata items, usually from the parent, must not
>> be null
>> * @param items the additional items
>> * @return the immutable list containing all of the items
>> *
>> * @since 22
>> */
>> public static List<CssMetaData<? extends Styleable, ?>> combine(
>> List<CssMetaData<? extends Styleable, ?>> list,
>> CssMetaData<? extends Styleable, ?>... items)
>>
>>
>> Problem(s):
>>
>> - the same less-than-optimal implementation is duplicated throughout the
>> javafx code base which combines the parent and child styleable properties,
>> using ArrayList wrapped in a Collections.unmodifiableList()
>> - the capacity of underlying ArrayList might exceed the number of items,
>> wasting memory
>> - a potential exists for the custom component developer to inadvertently
>> create a sub-standard implementation (i.e. return a List which does not
>> implement RandomAccess interface), or forget to include parent's styleables.
>>
>> Non-Goals:
>>
>> - not redesigning the lazy initialization of STYLEABLES list
>> - not changing the way styleables are enumerated in Nodes and Controls
>> - not adding any new methods to JDK (collections)
>>
>> To Be Discussed:
>>
>> - it is not clear whether the order of styleables returned by <N extends
>> Node>.getClassCssMetaData() is of any importance
>> - the current spec for Node.getCssMetaData() specifies the return value as
>> "The CssMetaData associated with this node, which may include the
>> CssMetaData of its superclasses.", implying that it may or may not include.
>> It is unclear whether it must include the parent's styleables (well, except
>> the Node whose superclass is Obje...
>
> Andy Goryachev has updated the pull request incrementally with one additional
> commit since the last revision:
>
> review comments
I give up.
-------------
PR Comment: https://git.openjdk.org/jfx/pull/1296#issuecomment-1832755513
