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Java example source code file (EditableView.java)

This example Java source code file (EditableView.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

awt, component, componentview, container, editableview, end, event, gui, jtextcomponent, net, network, shape, swing, text

The EditableView.java Java example source code

/*
 * Copyright (c) 1998, 2004, 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 javax.swing.text.html;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.text.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import java.util.*;

/**
 * EditableView sets the view it contains to be visible only when the
 * JTextComponent the view is contained in is editable. The min/pref/max
 * size is 0 when not visible.
 *
 * @author  Scott Violet
 */
class EditableView extends ComponentView {

    EditableView(Element e) {
        super(e);
    }

    public float getMinimumSpan(int axis) {
        if (isVisible) {
            return super.getMinimumSpan(axis);
        }
        return 0;
    }

    public float getPreferredSpan(int axis) {
        if (isVisible) {
            return super.getPreferredSpan(axis);
        }
        return 0;
    }

    public float getMaximumSpan(int axis) {
        if (isVisible) {
            return super.getMaximumSpan(axis);
        }
        return 0;
    }

    public void paint(Graphics g, Shape allocation) {
        Component c = getComponent();
        Container host = getContainer();

        if (host != null &&
            isVisible != ((JTextComponent)host).isEditable()) {
            isVisible = ((JTextComponent)host).isEditable();
            preferenceChanged(null, true, true);
            host.repaint();
        }
        /*
         * Note: we cannot tweak the visible state of the
         * component in createComponent() even though it
         * gets called after the setParent() call where
         * the value of the boolean is set.  This
         * because, the setComponentParent() in the
         * superclass, always does a setVisible(false)
         * after calling createComponent().   We therefore
         * use this flag in the paint() method to
         * setVisible() to true if required.
         */
        if (isVisible) {
            super.paint(g, allocation);
        }
        else {
            setSize(0, 0);
        }
        if (c != null) {
            c.setFocusable(isVisible);
        }
    }

    public void setParent(View parent) {
        if (parent != null) {
            Container host = parent.getContainer();
            if (host != null) {
                if (host instanceof JTextComponent) {
                    isVisible = ((JTextComponent)host).isEditable();
                } else {
                    isVisible = false;
                }
            }
        }
        super.setParent(parent);
    }

    /**
     * @return true if the Component is visible.
     */
    public boolean isVisible() {
        return isVisible;
    }

    /** Set to true if the component is visible. This is based off the
     * editability of the container. */
    private boolean isVisible;
} // End of EditableView

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