Java example source code file (WTextFieldPeer.java)

This example Java source code file (WTextFieldPeer.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

actionevent, awt, dimension, event, fontmetrics, inputmethodrequests, override, textfield, wtextcomponentpeer, wtextfieldpeer

The WTextFieldPeer.java Java example source code

/*
 * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 in the LICENSE file that
 * accompanied this code).
 *
 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.awt.windows;

import java.awt.*;
import java.awt.peer.*;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.im.InputMethodRequests;

final class WTextFieldPeer extends WTextComponentPeer implements TextFieldPeer {

    // WComponentPeer overrides

    @Override
    public Dimension getMinimumSize() {
        FontMetrics fm = getFontMetrics(((TextField)target).getFont());
        return new Dimension(fm.stringWidth(getText()) + 24,
                             fm.getHeight() + 8);
    }

    @Override
    public boolean handleJavaKeyEvent(KeyEvent e) {
        switch (e.getID()) {
           case KeyEvent.KEY_TYPED:
               if ((e.getKeyChar() == '\n') && !e.isAltDown() && !e.isControlDown()) {
                    postEvent(new ActionEvent(target, ActionEvent.ACTION_PERFORMED,
                                              getText(), e.getWhen(), e.getModifiers()));
                    return true;
               }
           break;
        }
        return false;
    }

    // TextFieldPeer implementation

    @Override
    public native void setEchoChar(char echoChar);

    @Override
    public Dimension getPreferredSize(int cols) {
        return getMinimumSize(cols);
    }

    @Override
    public Dimension getMinimumSize(int cols) {
        FontMetrics fm = getFontMetrics(((TextField)target).getFont());
        return new Dimension(fm.charWidth('0') * cols + 24, fm.getHeight() + 8);
    }

    @Override
    public InputMethodRequests getInputMethodRequests() {
        return null;
    }

    // Toolkit & peer internals

    WTextFieldPeer(TextField target) {
        super(target);
    }

    @Override
    native void create(WComponentPeer parent);

    @Override
    void initialize() {
        TextField tf = (TextField)target;
        if (tf.echoCharIsSet()) {
            setEchoChar(tf.getEchoChar());
        }
        super.initialize();
    }
}