package processing.app.syntax.im;
import java.awt.Rectangle;
import java.awt.event.InputMethodEvent;
import java.awt.event.InputMethodListener;
import java.awt.font.TextHitInfo;
import java.awt.im.InputMethodRequests;
import java.text.AttributedCharacterIterator;
import processing.app.syntax.JEditTextArea;
/**
* Support in-line Japanese input for PDE. (Maybe Chinese, Korean and more)
* This class is implemented by Java Input Method Framework and handles
* If you would like to know more about Java Input Method Framework,
* Please see http://java.sun.com/j2se/1.5.0/docs/guide/imf/
*
* This class is implemented to fix Bug #854.
* http://dev.processing.org/bugs/show_bug.cgi?id=854
*
* @author Takashi Maekawa (takachin@generative.info)
*/
public class InputMethodSupport implements InputMethodRequests,
InputMethodListener {
private int committed_count = 0;
private CompositionTextManager textManager;
public InputMethodSupport(JEditTextArea textArea) {
textManager = new CompositionTextManager(textArea);
textArea.enableInputMethods(true);
textArea.addInputMethodListener(this);
}
public Rectangle getTextLocation(TextHitInfo offset) {
return textManager.getTextLocation();
}
public TextHitInfo getLocationOffset(int x, int y) {
return null;
}
public int getInsertPositionOffset() {
return textManager.getInsertPositionOffset();
}
public AttributedCharacterIterator getCommittedText(int beginIndex,
int endIndex, AttributedCharacterIterator.Attribute[] attributes) {
return textManager.getCommittedText(beginIndex, endIndex);
}
public int getCommittedTextLength() {
return committed_count;
}
public AttributedCharacterIterator cancelLatestCommittedText(
AttributedCharacterIterator.Attribute[] attributes) {
return null;
}
public AttributedCharacterIterator getSelectedText(
AttributedCharacterIterator.Attribute[] attributes) {
return null;
}
/**
* Handles events from InputMethod.
* This method judges whether beginning of input or
* progress of input or end and call related method.
*
* @param event event from Input Method.
*/
public void inputMethodTextChanged(InputMethodEvent event) {
AttributedCharacterIterator text = event.getText();
committed_count = event.getCommittedCharacterCount();
if(isFullWidthSpaceInput(text)){
textManager.insertFullWidthSpace();
caretPositionChanged(event);
return;
}
if(isBeginInputProcess(text, textManager)){
textManager.beginCompositionText(text, committed_count);
caretPositionChanged(event);
return;
}
if (isInputProcess(text)){
textManager.processCompositionText(text, committed_count);
caretPositionChanged(event);
return;
}
textManager.endCompositionText(text, committed_count);
caretPositionChanged(event);
}
private boolean isFullWidthSpaceInput(AttributedCharacterIterator text){
if(text == null)
return false;
if(textManager.getIsInputProcess())
return false;
return (String.valueOf(text.first()).equals("\u3000"));
}
private boolean isBeginInputProcess(AttributedCharacterIterator text, CompositionTextManager textManager){
if(text == null)
return false;
if(textManager.getIsInputProcess())
return false;
return (isInputProcess(text));
}
private boolean isInputProcess(AttributedCharacterIterator text){
if(text == null)
return false;
return (text.getEndIndex() - (text.getBeginIndex() + committed_count) > 0);
}
public void caretPositionChanged(InputMethodEvent event) {
event.consume();
}
}