RFR: 8301121: RichTextArea Control (Incubator)

[Robert Lichtenberger]

On Tue, 30 Jul 2024 21:01:15 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Incubating a new feature - rich text control, **RichTextArea**, intended to bridge the functional gap with Swing and its StyledEditorKit/JEditorPane. The main design goal is to provide a control that is complete enough to be useful out-of-the box, as well as open to extension by the application developers.
> 
> This is a complex feature with a large API surface that would be nearly impossible to get right the first time, even after an extensive review. We are, therefore, introducing this in an incubating module, **jfx.incubator.richtext**. This will allow us to evolve the API in future releases without the strict compatibility constraints that other JavaFX modules have.
> 
> Please check out two manual test applications - one for RichTextArea (**RichTextAreaDemoApp**) and one for the CodeArea (**CodeAreaDemoApp**). Also, a small example provides a standalone rich text editor, see **RichEditorDemoApp**.
> 
> Because it's an incubating module, please focus on the public APIs rather than implementation.  There **will be** changes to the implementation once/if the module is promoted to the core by popular demand.  The goal of the incubator is to let the app developers try the new feature out. 
> 
> **References**
> 
> - Proposal: https://github.com/andy-goryachev-oracle/Test/blob/main/doc/RichTextArea/RichTextArea.md
> - Discussion points: https://github.com/andy-goryachev-oracle/Test/blob/main/doc/RichTextArea/RichTextAreaDiscussion.md
> - API specification (javadoc): https://cr.openjdk.org/~angorya/RichTextArea/javadoc
> - RichTextArea RFE: https://bugs.openjdk.org/browse/JDK-8301121
> - Behavior doc: https://github.com/andy-goryachev-oracle/jfx/blob/8301121.RichTextArea/doc-files/behavior/RichTextAreaBehavior.md
> - CSS Reference: https://cr.openjdk.org/~angorya/RichTextArea/javadoc/javafx.graphics/javafx/scene/doc-files/cssref.html
> - InputMap (v3): https://github.com/andy-goryachev-oracle/Test/blob/main/doc/InputMap/InputMapV3.md
> - Previous Draft PR: https://github.com/openjdk/jfx/pull/1374

modules/jfx.incubator.richtext/src/main/java/jfx/incubator/scene/control/richtext/model/BasicTextModel.java line 198:

> 196:      */
> 197:     public static class InMemoryContent implements Content {
> 198:         private final ArrayList<String> paragraphs = new ArrayList<>();

Since paragraphs may be inserted anywhere, I would guess that using a LinkedList should be more efficient here. Otherwise, when adding a line break somewhere in the middle of a long text, a lot of array members must be copied.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1524#discussion_r1717082870