Java example source code file (TextUI.java)

This example Java source code file (TextUI.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, badlocationexception, componentui, editorkit, gui, point, rectangle, string, swing, text, textui, view

The TextUI.java Java example source code

/*
 * Copyright (c) 1997, 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 javax.swing.plaf;

import javax.swing.Action;
import javax.swing.BoundedRangeModel;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Insets;
import javax.swing.text.*;

/**
 * Text editor user interface
 *
 * @author  Timothy Prinzing
 */
public abstract class TextUI extends ComponentUI
{
    /**
     * Converts the given location in the model to a place in
     * the view coordinate system.
     *
     * @param pos  the local location in the model to translate >= 0
     * @return the coordinates as a rectangle
     * @exception BadLocationException  if the given position does not
     *   represent a valid location in the associated document
     */
    public abstract Rectangle modelToView(JTextComponent t, int pos) throws BadLocationException;

    /**
     * Converts the given location in the model to a place in
     * the view coordinate system.
     *
     * @param pos  the local location in the model to translate >= 0
     * @return the coordinates as a rectangle
     * @exception BadLocationException  if the given position does not
     *   represent a valid location in the associated document
     */
    public abstract Rectangle modelToView(JTextComponent t, int pos, Position.Bias bias) throws BadLocationException;

    /**
     * Converts the given place in the view coordinate system
     * to the nearest representative location in the model.
     *
     * @param pt  the location in the view to translate.  This
     *   should be in the same coordinate system as the mouse
     *   events.
     * @return the offset from the start of the document >= 0
     */
    public abstract int viewToModel(JTextComponent t, Point pt);

    /**
     * Provides a mapping from the view coordinate space to the logical
     * coordinate space of the model.
     *
     * @param pt the location in the view to translate.
     *           This should be in the same coordinate system
     *           as the mouse events.
     * @param biasReturn
     *           filled in by this method to indicate whether
     *           the point given is closer to the previous or the next
     *           character in the model
     *
     * @return the location within the model that best represents the
     *         given point in the view >= 0
     */
    public abstract int viewToModel(JTextComponent t, Point pt,
                                    Position.Bias[] biasReturn);

    /**
     * Provides a way to determine the next visually represented model
     * location that one might place a caret.  Some views may not be visible,
     * they might not be in the same order found in the model, or they just
     * might not allow access to some of the locations in the model.
     *
     * @param t the text component for which this UI is installed
     * @param pos the position to convert >= 0
     * @param b the bias for the position
     * @param direction the direction from the current position that can
     *  be thought of as the arrow keys typically found on a keyboard.
     *  This may be SwingConstants.WEST, SwingConstants.EAST,
     *  SwingConstants.NORTH, or SwingConstants.SOUTH
     * @param biasRet an array to contain the bias for the returned position
     * @return the location within the model that best represents the next
     *  location visual position
     * @exception BadLocationException
     * @exception IllegalArgumentException for an invalid direction
     */
    public abstract int getNextVisualPositionFrom(JTextComponent t,
                         int pos, Position.Bias b,
                         int direction, Position.Bias[] biasRet)
                         throws BadLocationException;

    /**
     * Causes the portion of the view responsible for the
     * given part of the model to be repainted.
     *
     * @param p0 the beginning of the range >= 0
     * @param p1 the end of the range >= p0
     */
    public abstract void damageRange(JTextComponent t, int p0, int p1);

    /**
     * Causes the portion of the view responsible for the
     * given part of the model to be repainted.
     *
     * @param p0 the beginning of the range >= 0
     * @param p1 the end of the range >= p0
     */
    public abstract void damageRange(JTextComponent t, int p0, int p1,
                                     Position.Bias firstBias,
                                     Position.Bias secondBias);

    /**
     * Fetches the binding of services that set a policy
     * for the type of document being edited.  This contains
     * things like the commands available, stream readers and
     * writers, etc.
     *
     * @return the editor kit binding
     */
    public abstract EditorKit getEditorKit(JTextComponent t);

    /**
     * Fetches a View with the allocation of the associated
     * text component (i.e. the root of the hierarchy) that
     * can be traversed to determine how the model is being
     * represented spatially.
     *
     * @return the view
     */
    public abstract View getRootView(JTextComponent t);

    /**
     * Returns the string to be used as the tooltip at the passed in location.
     *
     * @see javax.swing.text.JTextComponent#getToolTipText
     * @since 1.4
     */
    public String getToolTipText(JTextComponent t, Point pt) {
        return null;
    }
}