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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.contentassist;
import java.util.HashMap;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.util.Assert;
/**
* Adapts a <code>Combo</code> to an <code>IContentAssistSubjectControl</code>.
* <p>
* Known issues:
* <ul>
* <li>https://bugs.eclipse.org/bugs/show_bug.cgi?id=50121
* => Combo doesn't get Arrow_up/Down keys on GTK</li>
*
* <li>https://bugs.eclipse.org/bugs/show_bug.cgi?id=50123
* => Combo broken on MacOS X</li>
* </ul>
* </p>
*
* @see org.eclipse.swt.widgets.Combo
* @see org.eclipse.jface.contentassist.IContentAssistSubjectControl
* @since 3.0
*/
public class ComboContentAssistSubjectAdapter extends AbstractControlContentAssistSubjectAdapter {
/**
* The <code>Document</code> of <code>fCombo</code>'s contents.
*/
private class InternalDocument extends Document {
/**
* Updates this <code>Document</code> with changes in <code>fCombo</code>.
*/
private ModifyListener fModifyListener;
private InternalDocument() {
super(fCombo.getText());
fModifyListener= new ModifyListener() {
/*
* @see org.eclipse.swt.events.ModifyListener#modifyText(org.eclipse.swt.events.ModifyEvent)
*/
public void modifyText(ModifyEvent e) {
set(fCombo.getText());
}
};
fCombo.addModifyListener(fModifyListener);
}
/*
* @see org.eclipse.jface.text.AbstractDocument#replace(int, int, java.lang.String)
*/
public void replace(int pos, int length, String text) throws BadLocationException {
super.replace(pos, length, text);
fCombo.removeModifyListener(fModifyListener);
fCombo.setText(get());
fCombo.addModifyListener(fModifyListener);
}
}
/**
* The combo.
*/
private Combo fCombo;
private HashMap fModifyListeners;
/**
* Creates a content assist subject control adapter for the given combo.
*
* @param combo the combo to adapt
*/
public ComboContentAssistSubjectAdapter(Combo combo) {
Assert.isNotNull(combo);
fCombo= combo;
fModifyListeners= new HashMap();
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#getControl()
*/
public Control getControl() {
return fCombo;
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#getLineHeight()
*/
public int getLineHeight() {
return fCombo.getTextHeight();
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#getCaretOffset()
*/
public int getCaretOffset() {
return fCombo.getSelection().y;
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#getLocationAtOffset(int)
*/
public Point getLocationAtOffset(int offset) {
String comboString= fCombo.getText();
GC gc = new GC(fCombo);
gc.setFont(fCombo.getFont());
Point extent= gc.textExtent(comboString.substring(0, Math.min(offset, comboString.length())));
int spaceWidth= gc.textExtent(" ").x; //$NON-NLS-1$
gc.dispose();
/*
* FIXME: the two space widths below is a workaround for bug 44072
*/
int x= 2 * spaceWidth + fCombo.getClientArea().x + fCombo.getBorderWidth() + extent.x;
return new Point(x, fCombo.getClientArea().y);
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#getSelectionRange()
*/
public Point getWidgetSelectionRange() {
return new Point(fCombo.getSelection().x, Math.abs(fCombo.getSelection().y - fCombo.getSelection().x));
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#getSelectedRange()
*/
public Point getSelectedRange() {
return new Point(fCombo.getSelection().x, Math.abs(fCombo.getSelection().y - fCombo.getSelection().x));
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#getDocument()
*/
public IDocument getDocument() {
IDocument document= (IDocument)fCombo.getData("document"); //$NON-NLS-1$
if (document == null) {
document= new InternalDocument() ;
fCombo.setData("document", document); //$NON-NLS-1$
}
return document;
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#setSelectedRange(int, int)
*/
public void setSelectedRange(int i, int j) {
fCombo.setSelection(new Point(i, i+j));
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#revealRange(int, int)
*/
public void revealRange(int i, int j) {
// XXX: this should be improved
fCombo.setSelection(new Point(i, i+j));
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#addSelectionListener(org.eclipse.swt.events.SelectionListener)
*/
public boolean addSelectionListener(final SelectionListener selectionListener) {
fCombo.addSelectionListener(selectionListener);
Listener listener= new Listener() {
/*
* @see org.eclipse.swt.events.ModifyListener#modifyText(org.eclipse.swt.events.ModifyEvent)
*/
public void handleEvent(Event e) {
selectionListener.widgetSelected(new SelectionEvent(e));
}
};
fCombo.addListener(SWT.Modify, listener);
fModifyListeners.put(selectionListener, listener);
return true;
}
/*
* @see org.eclipse.jface.text.contentassist.IContentAssistSubjectControl#removeSelectionListener(org.eclipse.swt.events.SelectionListener)
*/
public void removeSelectionListener(SelectionListener selectionListener) {
fCombo.removeSelectionListener(selectionListener);
Object listener= fModifyListeners.get(selectionListener);
if (listener instanceof Listener)
fCombo.removeListener(SWT.Modify, (Listener)listener);
}
}
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