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JFace is a UI toolkit with classes for handling many common UI programming tasks. JFace is window-system-independent in both its API and implementation, and is designed to work with SWT without hiding it. JFace includes the usual UI toolkit components of image and font registries, text, dialog, preference and wizard frameworks, and progress reporting for long running operations. Two of its more interesting features are actions and viewers. The action mechanism allows user commands to be defined independently from their exact whereabouts in the UI. Viewers are model based adapters for certain SWT widgets, simplifying the presentation of application data structured as lists, tables or trees.

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/*******************************************************************************
 * Copyright (c) 2005, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.fieldassist;

import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Text;

/**
 * An {@link IControlContentAdapter} for SWT Text controls. This is a
 * convenience class for easily creating a {@link ContentProposalAdapter} for
 * text fields.
 * 
 * @since 3.2
 */
public class TextContentAdapter implements IControlContentAdapter {

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.dialogs.taskassistance.IControlContentAdapter#getControlContents(org.eclipse.swt.widgets.Control)
	 */
	public String getControlContents(Control control) {
		return ((Text) control).getText();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.fieldassist.IControlContentAdapter#setControlContents(org.eclipse.swt.widgets.Control,
	 *      java.lang.String, int)
	 */
	public void setControlContents(Control control, String text,
			int cursorPosition) {
		((Text) control).setText(text);
		((Text) control).setSelection(cursorPosition, cursorPosition);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.fieldassist.IControlContentAdapter#insertControlContents(org.eclipse.swt.widgets.Control,
	 *      java.lang.String, int)
	 */
	public void insertControlContents(Control control, String text,
			int cursorPosition) {
		Point selection = ((Text) control).getSelection();
		((Text) control).insert(text);
		// Insert will leave the cursor at the end of the inserted text. If this
		// is not what we wanted, reset the selection.
		if (cursorPosition < text.length()) {
			((Text) control).setSelection(selection.x + cursorPosition,
					selection.x + cursorPosition);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.fieldassist.IControlContentAdapter#getCursorPosition(org.eclipse.swt.widgets.Control)
	 */
	public int getCursorPosition(Control control) {
		return ((Text) control).getCaretPosition();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.fieldassist.IControlContentAdapter#getInsertionBounds(org.eclipse.swt.widgets.Control)
	 */
	public Rectangle getInsertionBounds(Control control) {
		Text text = (Text) control;
		Point caretOrigin = text.getCaretLocation();
		return new Rectangle(caretOrigin.x, caretOrigin.y, 1, text
				.getLineHeight());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.fieldassist.IControlContentAdapter#setCursorPosition(org.eclipse.swt.widgets.Control,
	 *      int)
	 */
	public void setCursorPosition(Control control, int position) {
		((Text) control).setSelection(new Point(position, position));
	}
}