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jlechner |
/* BasicScrollPaneUI.java
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Copyright (C) 2002, 2004, 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.plaf.basic;
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import java.awt.Dimension;
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import java.awt.Graphics;
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import java.awt.Point;
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import java.awt.event.MouseWheelEvent;
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import java.awt.event.MouseWheelListener;
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import java.beans.PropertyChangeEvent;
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import java.beans.PropertyChangeListener;
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import javax.swing.JComponent;
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import javax.swing.JScrollBar;
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import javax.swing.JScrollPane;
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import javax.swing.JViewport;
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import javax.swing.LookAndFeel;
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import javax.swing.ScrollPaneConstants;
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import javax.swing.ScrollPaneLayout;
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import javax.swing.event.ChangeEvent;
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import javax.swing.event.ChangeListener;
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import javax.swing.plaf.ComponentUI;
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import javax.swing.plaf.ScrollPaneUI;
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public class BasicScrollPaneUI extends ScrollPaneUI
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implements ScrollPaneConstants
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{
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/**
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* Listens for changes in the state of the horizontal scrollbar's model and
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* updates the scrollpane accordingly.
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*
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* @author Roman Kennke (kennke@aicas.com)
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*/
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public class HSBChangeListener implements ChangeListener
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{
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/**
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* Receives notification when the state of the horizontal scrollbar
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* model has changed.
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*
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* @param event the change event
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*/
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public void stateChanged(ChangeEvent event)
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{
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JScrollBar hsb = scrollpane.getHorizontalScrollBar();
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JViewport vp = scrollpane.getViewport();
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Point viewPosition = vp.getViewPosition();
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int xpos = hsb.getValue();
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if (xpos != viewPosition.x)
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{
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viewPosition.x = xpos;
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vp.setViewPosition(viewPosition);
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}
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viewPosition.y = 0;
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JViewport columnHeader = scrollpane.getColumnHeader();
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if (columnHeader != null
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&& !columnHeader.getViewPosition().equals(viewPosition))
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columnHeader.setViewPosition(viewPosition);
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}
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}
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/**
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* Listens for changes in the state of the vertical scrollbar's model and
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* updates the scrollpane accordingly.
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*
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* @author Roman Kennke (kennke@aicas.com)
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*/
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public class VSBChangeListener implements ChangeListener
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{
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/**
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* Receives notification when the state of the vertical scrollbar
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* model has changed.
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*
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* @param event the change event
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*/
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public void stateChanged(ChangeEvent event)
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{
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JScrollBar vsb = scrollpane.getVerticalScrollBar();
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JViewport vp = scrollpane.getViewport();
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Point viewPosition = vp.getViewPosition();
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int ypos = vsb.getValue();
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if (ypos != viewPosition.y)
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{
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viewPosition.y = ypos;
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vp.setViewPosition(viewPosition);
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}
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viewPosition.x = 0;
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JViewport rowHeader = scrollpane.getRowHeader();
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if (rowHeader != null
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&& !rowHeader.getViewPosition().equals(viewPosition))
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rowHeader.setViewPosition(viewPosition);
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}
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}
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/**
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* Listens for changes of the viewport's extent size and updates the
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* scrollpane accordingly.
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*
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* @author Roman Kennke (kennke@aicas.com)
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*/
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public class ViewportChangeHandler implements ChangeListener
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{
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/**
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* Receives notification when the view's size, position or extent size
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* changes. When the extents size has changed, this method calls
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* {@link BasicScrollPaneUI#syncScrollPaneWithViewport()} to adjust the
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* scrollbars extents as well.
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*
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* @param event the change event
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*/
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public void stateChanged(ChangeEvent event)
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{
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JViewport vp = scrollpane.getViewport();
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JScrollBar hsb = scrollpane.getHorizontalScrollBar();
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JScrollBar vsb = scrollpane.getVerticalScrollBar();
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syncScrollPaneWithViewport();
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}
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}
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/**
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* Listens for property changes on the scrollpane and update the view
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* accordingly.
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*
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* @author Roman Kennke (kennke@aicas.com)
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*/
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public class PropertyChangeHandler implements PropertyChangeListener
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{
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/**
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* Receives notification when any of the scrollpane's bound property
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* changes. This method calls the appropriate update method on the
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* <code>ScrollBarUI</code>.
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*
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* @param e the property change event
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*
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* @see BasicScrollPaneUI#updateColumnHeader(PropertyChangeEvent)
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* @see BasicScrollPaneUI#updateRowHeader(PropertyChangeEvent)
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* @see BasicScrollPaneUI#updateScrollBarDisplayPolicy(PropertyChangeEvent)
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* @see BasicScrollPaneUI#updateViewport(PropertyChangeEvent)
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*/
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public void propertyChange(PropertyChangeEvent e)
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{
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String propName = e.getPropertyName();
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if (propName.equals("viewport"))
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updateViewport(e);
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else if (propName.equals("rowHeader"))
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updateRowHeader(e);
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else if (propName.equals("columnHeader"))
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updateColumnHeader(e);
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else if (propName.equals("horizontalScrollBarPolicy")
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|| e.getPropertyName().equals("verticalScrollBarPolicy"))
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updateScrollBarDisplayPolicy(e);
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else if (propName.equals("verticalScrollBar"))
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{
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JScrollBar oldSb = (JScrollBar) e.getOldValue();
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oldSb.getModel().removeChangeListener(vsbChangeListener);
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JScrollBar newSb = (JScrollBar) e.getNewValue();
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newSb.getModel().addChangeListener(vsbChangeListener);
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}
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else if (propName.equals("horizontalScrollBar"))
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{
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JScrollBar oldSb = (JScrollBar) e.getOldValue();
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oldSb.getModel().removeChangeListener(hsbChangeListener);
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JScrollBar newSb = (JScrollBar) e.getNewValue();
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newSb.getModel().addChangeListener(hsbChangeListener);
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}
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}
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}
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/**
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* Listens for mouse wheel events and update the scrollpane accordingly.
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*
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* @author Roman Kennke (kennke@aicas.com)
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*
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* @since 1.4
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*/
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protected class MouseWheelHandler implements MouseWheelListener
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{
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/**
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* Receives notification whenever the mouse wheel is moved.
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*
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* @param event the mouse wheel event
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*/
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public void mouseWheelMoved(MouseWheelEvent event)
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{
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// TODO: Implement this properly.
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}
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}
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/** The Scrollpane for which the UI is provided by this class. */
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protected JScrollPane scrollpane;
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/**
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* The horizontal scrollbar listener.
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*/
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protected ChangeListener hsbChangeListener;
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/**
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* The vertical scrollbar listener.
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*/
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protected ChangeListener vsbChangeListener;
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/**
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* The viewport listener.
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*/
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protected ChangeListener viewportChangeListener;
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/**
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* The scrollpane property change listener.
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*/
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protected PropertyChangeListener spPropertyChangeListener;
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/**
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* The mousewheel listener for the scrollpane.
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*/
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MouseWheelListener mouseWheelListener;
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public static ComponentUI createUI(final JComponent c)
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{
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return new BasicScrollPaneUI();
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}
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protected void installDefaults(JScrollPane p)
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{
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scrollpane = p;
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LookAndFeel.installColorsAndFont(p, "ScrollPane.background",
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"ScrollPane.foreground",
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"ScrollPane.font");
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LookAndFeel.installBorder(p, "ScrollPane.border");
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p.setOpaque(true);
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}
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protected void uninstallDefaults(JScrollPane p)
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{
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p.setForeground(null);
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p.setBackground(null);
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p.setFont(null);
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p.setBorder(null);
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scrollpane = null;
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}
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public void installUI(final JComponent c)
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{
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super.installUI(c);
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installDefaults((JScrollPane) c);
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installListeners((JScrollPane) c);
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installKeyboardActions((JScrollPane) c);
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}
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/**
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* Installs the listeners on the scrollbars, the viewport and the scrollpane.
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*
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* @param sp the scrollpane on which to install the listeners
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*/
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protected void installListeners(JScrollPane sp)
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{
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if (spPropertyChangeListener == null)
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spPropertyChangeListener = createPropertyChangeListener();
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sp.addPropertyChangeListener(spPropertyChangeListener);
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if (hsbChangeListener == null)
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hsbChangeListener = createHSBChangeListener();
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sp.getHorizontalScrollBar().getModel().addChangeListener(hsbChangeListener);
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if (vsbChangeListener == null)
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vsbChangeListener = createVSBChangeListener();
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sp.getVerticalScrollBar().getModel().addChangeListener(vsbChangeListener);
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if (viewportChangeListener == null)
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viewportChangeListener = createViewportChangeListener();
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sp.getViewport().addChangeListener(viewportChangeListener);
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if (mouseWheelListener == null)
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mouseWheelListener = createMouseWheelListener();
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sp.addMouseWheelListener(mouseWheelListener);
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}
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/**
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* Installs additional keyboard actions on the scrollpane. This is a hook
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* method provided to subclasses in order to install their own keyboard
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* actions.
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*
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* @param sp the scrollpane to install keyboard actions on
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*/
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protected void installKeyboardActions(JScrollPane sp)
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{
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// TODO: Is this only a hook method or should we actually do something
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// here? If the latter, than figure out what and implement this.
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}
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/**
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* Creates and returns the change listener for the horizontal scrollbar.
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*
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* @return the change listener for the horizontal scrollbar
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*/
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protected ChangeListener createHSBChangeListener()
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{
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return new HSBChangeListener();
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}
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/**
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* Creates and returns the change listener for the vertical scrollbar.
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*
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* @return the change listener for the vertical scrollbar
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*/
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protected ChangeListener createVSBChangeListener()
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{
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return new VSBChangeListener();
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}
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/**
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* Creates and returns the change listener for the viewport.
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*
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* @return the change listener for the viewport
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*/
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protected ChangeListener createViewportChangeListener()
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{
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return new ViewportChangeHandler();
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}
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/**
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* Creates and returns the property change listener for the scrollpane.
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*
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* @return the property change listener for the scrollpane
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*/
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protected PropertyChangeListener createPropertyChangeListener()
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{
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return new PropertyChangeHandler();
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}
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/**
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* Creates and returns the mouse wheel listener for the scrollpane.
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*
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* @return the mouse wheel listener for the scrollpane
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*/
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384 |
|
|
protected MouseWheelListener createMouseWheelListener()
|
385 |
|
|
{
|
386 |
|
|
return new MouseWheelHandler();
|
387 |
|
|
}
|
388 |
|
|
|
389 |
|
|
public void uninstallUI(final JComponent c)
|
390 |
|
|
{
|
391 |
|
|
super.uninstallUI(c);
|
392 |
|
|
this.uninstallDefaults((JScrollPane)c);
|
393 |
|
|
uninstallListeners((JScrollPane) c);
|
394 |
|
|
installKeyboardActions((JScrollPane) c);
|
395 |
|
|
}
|
396 |
|
|
|
397 |
|
|
/**
|
398 |
|
|
* Uninstalls all the listeners that have been installed in
|
399 |
|
|
* {@link #installListeners(JScrollPane)}.
|
400 |
|
|
*
|
401 |
|
|
* @param c the scrollpane from which to uninstall the listeners
|
402 |
|
|
*/
|
403 |
|
|
protected void uninstallListeners(JComponent c)
|
404 |
|
|
{
|
405 |
|
|
JScrollPane sp = (JScrollPane) c;
|
406 |
|
|
sp.removePropertyChangeListener(spPropertyChangeListener);
|
407 |
|
|
sp.getHorizontalScrollBar().getModel()
|
408 |
|
|
.removeChangeListener(hsbChangeListener);
|
409 |
|
|
sp.getVerticalScrollBar().getModel()
|
410 |
|
|
.removeChangeListener(vsbChangeListener);
|
411 |
|
|
sp.getViewport().removeChangeListener(viewportChangeListener);
|
412 |
|
|
sp.removeMouseWheelListener(mouseWheelListener);
|
413 |
|
|
}
|
414 |
|
|
|
415 |
|
|
/**
|
416 |
|
|
* Uninstalls all keyboard actions from the JScrollPane that have been
|
417 |
|
|
* installed by {@link #installKeyboardActions}. This is a hook method
|
418 |
|
|
* provided to subclasses to add their own keyboard actions.
|
419 |
|
|
*
|
420 |
|
|
* @param sp the scrollpane to uninstall keyboard actions from
|
421 |
|
|
*/
|
422 |
|
|
protected void uninstallKeyboardActions(JScrollPane sp)
|
423 |
|
|
{
|
424 |
|
|
// TODO: Is this only a hook method or should we actually do something
|
425 |
|
|
// here? If the latter, than figure out what and implement this.
|
426 |
|
|
}
|
427 |
|
|
|
428 |
|
|
public Dimension getMinimumSize(JComponent c)
|
429 |
|
|
{
|
430 |
|
|
JScrollPane p = (JScrollPane ) c;
|
431 |
|
|
ScrollPaneLayout sl = (ScrollPaneLayout) p.getLayout();
|
432 |
|
|
return sl.minimumLayoutSize(c);
|
433 |
|
|
}
|
434 |
|
|
|
435 |
|
|
public void paint(Graphics g, JComponent c)
|
436 |
|
|
{
|
437 |
|
|
// do nothing; the normal painting-of-children algorithm, along with
|
438 |
|
|
// ScrollPaneLayout, does all the relevant work.
|
439 |
|
|
}
|
440 |
|
|
|
441 |
|
|
/**
|
442 |
|
|
* Synchronizes the scrollbars with the viewport's extents.
|
443 |
|
|
*/
|
444 |
|
|
protected void syncScrollPaneWithViewport()
|
445 |
|
|
{
|
446 |
|
|
JViewport vp = scrollpane.getViewport();
|
447 |
|
|
|
448 |
|
|
// Update the horizontal scrollbar.
|
449 |
|
|
JScrollBar hsb = scrollpane.getHorizontalScrollBar();
|
450 |
|
|
hsb.setMaximum(vp.getViewSize().width);
|
451 |
|
|
hsb.setValue(vp.getViewPosition().x);
|
452 |
|
|
hsb.setVisibleAmount(vp.getExtentSize().width);
|
453 |
|
|
|
454 |
|
|
// Update the vertical scrollbar.
|
455 |
|
|
JScrollBar vsb = scrollpane.getVerticalScrollBar();
|
456 |
|
|
vsb.setMaximum(vp.getViewSize().height);
|
457 |
|
|
vsb.setValue(vp.getViewPosition().y);
|
458 |
|
|
vsb.setVisibleAmount(vp.getExtentSize().height);
|
459 |
|
|
}
|
460 |
|
|
|
461 |
|
|
/**
|
462 |
|
|
* Receives notification when the <code>columnHeader</code> property has
|
463 |
|
|
* changed on the scrollpane.
|
464 |
|
|
*
|
465 |
|
|
* @param ev the property change event
|
466 |
|
|
*/
|
467 |
|
|
protected void updateColumnHeader(PropertyChangeEvent ev)
|
468 |
|
|
{
|
469 |
|
|
// TODO: Find out what should be done here. Or is this only a hook?
|
470 |
|
|
}
|
471 |
|
|
|
472 |
|
|
/**
|
473 |
|
|
* Receives notification when the <code>rowHeader</code> property has changed
|
474 |
|
|
* on the scrollpane.
|
475 |
|
|
*
|
476 |
|
|
* @param ev the property change event
|
477 |
|
|
*/
|
478 |
|
|
protected void updateRowHeader(PropertyChangeEvent ev)
|
479 |
|
|
{
|
480 |
|
|
// TODO: Find out what should be done here. Or is this only a hook?
|
481 |
|
|
}
|
482 |
|
|
|
483 |
|
|
/**
|
484 |
|
|
* Receives notification when the <code>scrollBarDisplayPolicy</code>
|
485 |
|
|
* property has changed on the scrollpane.
|
486 |
|
|
*
|
487 |
|
|
* @param ev the property change event
|
488 |
|
|
*/
|
489 |
|
|
protected void updateScrollBarDisplayPolicy(PropertyChangeEvent ev)
|
490 |
|
|
{
|
491 |
|
|
// TODO: Find out what should be done here. Or is this only a hook?
|
492 |
|
|
}
|
493 |
|
|
|
494 |
|
|
/**
|
495 |
|
|
* Receives notification when the <code>viewport</code> property has changed
|
496 |
|
|
* on the scrollpane.
|
497 |
|
|
*
|
498 |
|
|
* This method sets removes the viewportChangeListener from the old viewport
|
499 |
|
|
* and adds it to the new viewport.
|
500 |
|
|
*
|
501 |
|
|
* @param ev the property change event
|
502 |
|
|
*/
|
503 |
|
|
protected void updateViewport(PropertyChangeEvent ev)
|
504 |
|
|
{
|
505 |
|
|
JViewport oldViewport = (JViewport) ev.getOldValue();
|
506 |
|
|
oldViewport.removeChangeListener(viewportChangeListener);
|
507 |
|
|
JViewport newViewport = (JViewport) ev.getNewValue();
|
508 |
|
|
oldViewport.addChangeListener(viewportChangeListener);
|
509 |
|
|
}
|
510 |
|
|
}
|
511 |
|
|
|
512 |
|
|
|
513 |
|
|
|
514 |
|
|
|
515 |
|
|
|
516 |
|
|
|
517 |
|
|
|
518 |
|
|
|
519 |
|
|
|
520 |
|
|
|
521 |
|
|
|
522 |
|
|
|