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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [javax/] [swing/] [text/] [IconView.java] - Blame information for rev 772

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1 772 jeremybenn
/* IconView.java -- A view to render icons
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   Copyright (C) 2005  Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.text;
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import java.awt.Graphics;
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import java.awt.Rectangle;
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import java.awt.Shape;
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import javax.swing.Icon;
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import javax.swing.JTextPane;
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/**
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 * A View that can render an icon. This view is created by the
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 * {@link StyledEditorKit}'s view factory for all elements that have name
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 * {@link StyleConstants#IconElementName}. This is usually created by
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 * inserting an icon into <code>JTextPane</code> using
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 * {@link JTextPane#insertIcon(Icon)}
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 *
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 * The icon is determined using the attribute
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 * {@link StyleConstants#IconAttribute}, which's value must be an {@link Icon}.
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 *
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 * @author Roman Kennke (kennke@aicas.com)
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 */
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public class IconView
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  extends View
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{
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  /**
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   * Creates a new <code>IconView</code> for the given <code>Element</code>.
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   *
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   * @param element the element that is rendered by this IconView
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   */
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  public IconView(Element element)
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  {
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    super(element);
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  }
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  /**
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   * Renders the <code>Element</code> that is associated with this
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   * <code>View</code>.
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   *
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   * @param g the <code>Graphics</code> context to render to
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   * @param a the allocated region for the <code>Element</code>
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   */
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  public void paint(Graphics g, Shape a)
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  {
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    Icon icon = StyleConstants.getIcon(getElement().getAttributes());
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    Rectangle b = a.getBounds();
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    icon.paintIcon(getContainer(), g, b.x, b.y);
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  }
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  /**
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   * Returns the preferred span of the content managed by this
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   * <code>View</code> along the specified <code>axis</code>.
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   *
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   * @param axis the axis
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   *
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   * @return the preferred span of this <code>View</code>.
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   */
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  public float getPreferredSpan(int axis)
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  {
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    Icon icon = StyleConstants.getIcon(getElement().getAttributes());
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    float span;
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    if (axis == X_AXIS)
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      span = icon.getIconWidth();
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    else if (axis == Y_AXIS)
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      span = icon.getIconHeight();
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    else
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      throw new IllegalArgumentException();
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    return span;
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  }
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  /**
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   * Maps a position in the document into the coordinate space of the View.
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   * The output rectangle usually reflects the font height but has a width
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   * of zero.
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   *
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   * @param pos the position of the character in the model
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   * @param a the area that is occupied by the view
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   * @param b either {@link Position.Bias#Forward} or
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   *        {@link Position.Bias#Backward} depending on the preferred
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   *        direction bias. If <code>null</code> this defaults to
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   *        <code>Position.Bias.Forward</code>
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   *
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   * @return a rectangle that gives the location of the document position
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   *         inside the view coordinate space
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   *
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   * @throws BadLocationException if <code>pos</code> is invalid
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   * @throws IllegalArgumentException if b is not one of the above listed
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   *         valid values
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   */
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  public Shape modelToView(int pos, Shape a, Position.Bias b)
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    throws BadLocationException
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  {
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    Element el = getElement();
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    Rectangle r = a.getBounds();
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    Icon icon = StyleConstants.getIcon(el.getAttributes());
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    return new Rectangle(r.x, r.y, icon.getIconWidth(), icon.getIconHeight());
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  }
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  /**
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   * Maps coordinates from the <code>View</code>'s space into a position
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   * in the document model.
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   *
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   * @param x the x coordinate in the view space
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   * @param y the y coordinate in the view space
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   * @param a the allocation of this <code>View</code>
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   * @param b the bias to use
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   *
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   * @return the position in the document that corresponds to the screen
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   *         coordinates <code>x, y</code>
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   */
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  public int viewToModel(float x, float y, Shape a, Position.Bias[] b)
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  {
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    // The element should only have one character position and it is clear
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    // that this position is the position that best matches the given screen
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    // coordinates, simply because this view has only this one position.
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    Element el = getElement();
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    return el.getStartOffset();
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  }
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  /**
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   * Returns the alignment for this view. This will be 1.0 for the Y_AXIS,
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   * and the super behaviour for the X_AXIS.
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   *
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   * @param axis the axis for which to calculate the alignment
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   *
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   * @return the alignment
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   */
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  public float getAlignment(int axis)
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  {
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    float align;
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    if (axis == Y_AXIS)
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      align = 1.0F;
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    else
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      align = super.getAlignment(axis);
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    return align;
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  }
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}

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