QtTextComponentPeer.java

/*
 * @(#)QtTextComponentPeer.java	1.13 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation. 
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License version 2 for more details (a copy is
 * included at /legal/license.txt). 
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA 
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions. 
 *
 */
package sun.awt.qt;

import java.security.*;

import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;

import sun.awt.peer.*;


/**
 *
 *
 * @author Nicholas Allen
 */

abstract class QtTextComponentPeer extends QtComponentPeer implements TextComponentPeer
{
    private static native void initIDs();

    private QtClipboard systemClipboard;
    private int pasteStart, pasteEnd;
	
    static
    {
	initIDs();
    }
	
    /** Creates a new QtTextComponentPeer. */

    QtTextComponentPeer (QtToolkit toolkit, TextComponent target)
    {
	super (toolkit, target);
	setText (target.getText());
	setEditable(target.isEditable());

        target.enableInputMethods(true);

        final QtToolkit tmpToolkit = toolkit;
        AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {
                systemClipboard = (QtClipboard)(tmpToolkit.getSystemClipboard());
                
                return null;
            }
        });
    }
	
    public boolean isFocusTraversable() 
    {
	return true;
    }

    public native void setEditable(boolean editable);

    protected native String getTextNative();

    public String getText()
    {
        return getTextNative();
    }

    protected native void setTextNative(String text);

    public void setText(String text)
    {
        if (text != null)
            if ((text.length() > 0) || (getText().length() > 0))
                setTextNative(text);
    }

    public Dimension getPreferredSize(int rows, int columns) {
        return getMinimumSize(rows, columns);
    }

    public Dimension getMinimumSize(int rows, int columns) {
        FontMetrics fm = getFontMetrics(target.getFont());

        /* Calculate proper size for text area
         */
        int colWidth = fm.charWidth('0');
        int rowHeight = fm.getHeight();

	/* adding 1 to both columns and row to extend visual space
	 * of the minimumSize - fixes bug 4707759
	 */
        return new Dimension((columns +1) * colWidth, (rows +1) * rowHeight);
    }

    public native int getSelectionStart();

    public native int getSelectionEnd();

    public native void select(int selStart, int selEnd);

    public native void setCaretPosition(int pos);

    public native int getCaretPosition();
	
    /*
     * Post a new TextEvent when the value of a text component changes.
     */
	
    private void postTextEvent()
    {
        QtToolkit.postEvent(new TextEvent(target, TextEvent.TEXT_VALUE_CHANGED));
    }

    void pasteData(byte[] data) {

        String text = getText();        
        int textLen = text.length();
        
        if(pasteEnd > textLen)
            pasteEnd = textLen;
        
        if(pasteStart > pasteEnd)
            pasteStart = pasteEnd;
        
        String preText = text.substring(0, pasteStart);
        String postText = text.substring(pasteEnd, textLen);
        
        text = preText + new String(data) + postText;
        
        setText(text);
        setCaretPosition(text.length() - postText.length());
    }
}