/*******************************************************************************
 * 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
 * Port to the D programming language:
 *     Frank Benoit <benoit@tionex.de>
 *******************************************************************************/
module dwtx.jface.fieldassist.ComboContentAdapter;

import dwtx.jface.fieldassist.IControlContentAdapter;

import dwt.graphics.GC;
import dwt.graphics.Point;
import dwt.graphics.Rectangle;
import dwt.widgets.Combo;
import dwt.widgets.Control;

import dwt.dwthelper.utils;
import tango.text.Text;
alias tango.text.Text.Text!(char) StringBuffer;
/**
 * An {@link IControlContentAdapter} for DWT Combo controls. This is a
 * convenience class for easily creating a {@link ContentProposalAdapter} for
 * combo fields.
 *
 * @since 3.2
 */
public class ComboContentAdapter : IControlContentAdapter {

    /*
     * (non-Javadoc)
     *
     * @see dwtx.jface.dialogs.taskassistance.IControlContentAdapter#getControlContents(dwt.widgets.Control)
     */
    public String getControlContents(Control control) {
        return (cast(Combo) control).getText();
    }

    /*
     * (non-Javadoc)
     *
     * @see dwtx.jface.fieldassist.IControlContentAdapter#setControlContents(dwt.widgets.Control,
     *      java.lang.String, int)
     */
    public void setControlContents(Control control, String text,
            int cursorPosition) {
        (cast(Combo) control).setText(text);
        (cast(Combo) control)
                .setSelection(new Point(cursorPosition, cursorPosition));
    }

    /*
     * (non-Javadoc)
     *
     * @see dwtx.jface.fieldassist.IControlContentAdapter#insertControlContents(dwt.widgets.Control,
     *      java.lang.String, int)
     */
    public void insertControlContents(Control control, String text,
            int cursorPosition) {
        Combo combo = cast(Combo) control;
        String contents = combo.getText();
        Point selection = combo.getSelection();
        StringBuffer sb = new StringBuffer();
        sb.append(contents.substring(0, selection.x));
        sb.append(text);
        if (selection.y < contents.length) {
            sb.append(contents.substring(selection.y, contents.length));
        }
        combo.setText(sb.toString());
        selection.x = selection.x + cursorPosition;
        selection.y = selection.x;
        combo.setSelection(selection);
    }

    /*
     * (non-Javadoc)
     *
     * @see dwtx.jface.fieldassist.IControlContentAdapter#getCursorPosition(dwt.widgets.Control)
     */
    public int getCursorPosition(Control control) {
        return (cast(Combo) control).getSelection().x;
    }

    /*
     * (non-Javadoc)
     *
     * @see dwtx.jface.fieldassist.IControlContentAdapter#getInsertionBounds(dwt.widgets.Control)
     */
    public Rectangle getInsertionBounds(Control control) {
        Combo combo = cast(Combo) control;
        int position = combo.getSelection().y;
        String contents = combo.getText();
        GC gc = new GC(combo);
        gc.setFont(combo.getFont());
        Point extent = gc.textExtent(contents.substring(0, Math.min(position,
                contents.length)));
        gc.dispose();
        return new Rectangle(combo.getClientArea().x + extent.x, combo
                .getClientArea().y, 1, combo.getClientArea().height);
    }

    /*
     * (non-Javadoc)
     *
     * @see dwtx.jface.fieldassist.IControlContentAdapter#setCursorPosition(dwt.widgets.Control,
     *      int)
     */
    public void setCursorPosition(Control control, int index) {
        (cast(Combo) control).setSelection(new Point(index, index));
    }

}