/*

 * Copyright (c) 1998, 2006, 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.text.BreakIterator;

import javax.swing.event.DocumentEvent;

import javax.swing.text.*;

/**

 * Displays the <dfn>inline element</dfn> styles

 * based upon css attributes.

 *

 * @author  Timothy Prinzing

 */

public class InlineView extends LabelView {

    /**

     * Constructs a new view wrapped on an element.

     *

     * @param elem the element

     */

    public InlineView(Element elem) {

        super(elem);

        StyleSheet sheet = getStyleSheet();

        attr = sheet.getViewAttributes(this);

    }

    /**

     * Gives notification that something was inserted into

     * the document in a location that this view is responsible for.

     * If either parameter is <code>null</code>, behavior of this method is

     * implementation dependent.

     *

     * @param e the change information from the associated document

     * @param a the current allocation of the view

     * @param f the factory to use to rebuild if the view has children

     * @since 1.5

     * @see View#insertUpdate

     */

    public void insertUpdate(DocumentEvent e, Shape a, ViewFactory f) {

        super.insertUpdate(e, a, f);

    }

    /**

     * Gives notification that something was removed from the document

     * in a location that this view is responsible for.

     * If either parameter is <code>null</code>, behavior of this method is

     * implementation dependent.

     *

     * @param e the change information from the associated document

     * @param a the current allocation of the view

     * @param f the factory to use to rebuild if the view has children

     * @since 1.5

     * @see View#removeUpdate

     */

    public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f) {

        super.removeUpdate(e, a, f);

    }

    /**

     * Gives notification from the document that attributes were changed

     * in a location that this view is responsible for.

     *

     * @param e the change information from the associated document

     * @param a the current allocation of the view

     * @param f the factory to use to rebuild if the view has children

     * @see View#changedUpdate

     */

    public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f) {

        super.changedUpdate(e, a, f);

        StyleSheet sheet = getStyleSheet();

        attr = sheet.getViewAttributes(this);

        preferenceChanged(null, true, true);

    }

    /**

     * Fetches the attributes to use when rendering.  This is

     * implemented to multiplex the attributes specified in the

     * model with a StyleSheet.

     */

    public AttributeSet getAttributes() {

        return attr;

    }

    /**

     * Determines how attractive a break opportunity in

     * this view is.  This can be used for determining which

     * view is the most attractive to call <code>breakView</code>

     * on in the process of formatting.  A view that represents

     * text that has whitespace in it might be more attractive

     * than a view that has no whitespace, for example.  The

     * higher the weight, the more attractive the break.  A

     * value equal to or lower than <code>BadBreakWeight</code>

     * should not be considered for a break.  A value greater

     * than or equal to <code>ForcedBreakWeight</code> should

     * be broken.

     * <p>

     * This is implemented to provide the default behavior

     * of returning <code>BadBreakWeight</code> unless the length

     * is greater than the length of the view in which case the

     * entire view represents the fragment.  Unless a view has

     * been written to support breaking behavior, it is not

     * attractive to try and break the view.  An example of

     * a view that does support breaking is <code>LabelView</code>.

     * An example of a view that uses break weight is

     * <code>ParagraphView</code>.

     *

     * @param axis may be either View.X_AXIS or View.Y_AXIS

     * @param pos the potential location of the start of the

     *   broken view >= 0.  This may be useful for calculating tab

     *   positions.

     * @param len specifies the relative length from <em>pos</em>

     *   where a potential break is desired >= 0.

     * @return the weight, which should be a value between

     *   ForcedBreakWeight and BadBreakWeight.

     * @see LabelView

     * @see ParagraphView

     * @see javax.swing.text.View#BadBreakWeight

     * @see javax.swing.text.View#GoodBreakWeight

     * @see javax.swing.text.View#ExcellentBreakWeight

     * @see javax.swing.text.View#ForcedBreakWeight

     */

    public int getBreakWeight(int axis, float pos, float len) {

        if (nowrap) {

            return BadBreakWeight;

        }

        return super.getBreakWeight(axis, pos, len);

    }

    /**

     * Tries to break this view on the given axis. Refer to

     * {@link javax.swing.text.View#breakView} for a complete

     * description of this method.

     * <p>Behavior of this method is unspecified in case <code>axis</code>

     * is neither <code>View.X_AXIS</code> nor <code>View.Y_AXIS</code>, and

     * in case <code>offset</code>, <code>pos</code>, or <code>len</code>

     * is null.

     *

     * @param axis may be either <code>View.X_AXIS</code> or

     *          <code>View.Y_AXIS</code>

     * @param offset the location in the document model

     *   that a broken fragment would occupy >= 0.  This

     *   would be the starting offset of the fragment

     *   returned

     * @param pos the position along the axis that the

     *  broken view would occupy >= 0.  This may be useful for

     *  things like tab calculations

     * @param len specifies the distance along the axis

     *  where a potential break is desired >= 0

     * @return the fragment of the view that represents the

     *  given span.

     * @since 1.5

     * @see javax.swing.text.View#breakView

     */

    public View breakView(int axis, int offset, float pos, float len) {

        return super.breakView(axis, offset, pos, len);

    }

    /**

     * Set the cached properties from the attributes.

     */

    protected void setPropertiesFromAttributes() {

        super.setPropertiesFromAttributes();

        AttributeSet a = getAttributes();

        Object decor = a.getAttribute(CSS.Attribute.TEXT_DECORATION);

        boolean u = (decor != null) ?

          (decor.toString().indexOf("underline") >= 0) : false;

        setUnderline(u);

        boolean s = (decor != null) ?

          (decor.toString().indexOf("line-through") >= 0) : false;

        setStrikeThrough(s);

        Object vAlign = a.getAttribute(CSS.Attribute.VERTICAL_ALIGN);

        s = (vAlign != null) ? (vAlign.toString().indexOf("sup") >= 0) : false;

        setSuperscript(s);

        s = (vAlign != null) ? (vAlign.toString().indexOf("sub") >= 0) : false;

        setSubscript(s);

        Object whitespace = a.getAttribute(CSS.Attribute.WHITE_SPACE);

        if ((whitespace != null) && whitespace.equals("nowrap")) {

            nowrap = true;

        } else {

            nowrap = false;

        }

        HTMLDocument doc = (HTMLDocument)getDocument();

        // fetches background color from stylesheet if specified

        Color bg = doc.getBackground(a);

        if (bg != null) {

            setBackground(bg);

        }

    }

    protected StyleSheet getStyleSheet() {

        HTMLDocument doc = (HTMLDocument) getDocument();

        return doc.getStyleSheet();

    }

    private boolean nowrap;

    private AttributeSet attr;

}