processing.app.syntax.im

Class CompositionTextPainter

Object

CompositionTextPainter

public class CompositionTextPainter
extends Object

Paint texts from input method. Text via input method are transmitted by AttributedCaharacterIterator. This class helps the PDE's TextAreaPainter to handle AttributedCaharacterIterator. For practical purposes, paint to textarea is done by TextLayout class. Because TextLayout class is easy to draw composing texts. (For example, draw underline composing texts, focus when select from candidates text.)

Constructor Summary

Constructors

Constructor and Description
CompositionTextPainter(JEditTextArea textArea) Constructor for painter.

Method Summary

Modifier and Type	Method and Description
void	draw(Graphics gfx, Color fillBackGroundColor) Draw text via input method with composed text information.
boolean	hasComposedTextLayout() Check the painter has TextLayout.
void	invalidateComposedTextLayout(int composedEndCaretPosition) Invalidate this TextLayout to set null.
void	setCaret(TextHitInfo caret)
void	setComposedTextLayout(TextLayout composedTextLayout, int composedStartCaretPosition) Set TextLayout to the painter.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CompositionTextPainter

public CompositionTextPainter(JEditTextArea textArea)

Constructor for painter.

Parameters:

textArea - textarea used by PDE.

Method Detail

hasComposedTextLayout

public boolean hasComposedTextLayout()

Check the painter has TextLayout. If a user input via InputMethod, this result will return true.

setComposedTextLayout

public void setComposedTextLayout(TextLayout composedTextLayout,
                                  int composedStartCaretPosition)

Set TextLayout to the painter. TextLayout will be created and set by CompositionTextManager.

See Also:

CompositionTextManager

invalidateComposedTextLayout

public void invalidateComposedTextLayout(int composedEndCaretPosition)

Invalidate this TextLayout to set null. If a user end input via InputMethod, this method will called from CompositionTextManager.endCompositionText

draw

public void draw(Graphics gfx,
                 Color fillBackGroundColor)

Draw text via input method with composed text information. This method can draw texts with some underlines to illustrate converting characters. This method is workaround for TextAreaPainter. Because, TextAreaPainter can't treat AttributedCharacterIterator directly. AttributedCharacterIterator has very important information when composing text. It has a map where are converted characters and committed characters. Ideally, changing TextAreaPainter method can treat AttributedCharacterIterator is better. But it's very tough!! So I choose to write some code as a workaround. This draw method is proceeded with the following steps. 1. Original TextAreaPainter draws characters. 2. CompositionTextPainter.draw method paints composed text. It was actually drawn by TextLayout.

Parameters:

gfx - set TextAreaPainter's Graphics object.

fillBackGroundColor - set textarea's background.

setCaret

public void setCaret(TextHitInfo caret)