diff options
Diffstat (limited to 'libjava/classpath/javax/swing/plaf/basic/BasicViewportUI.java')
| -rw-r--r-- | libjava/classpath/javax/swing/plaf/basic/BasicViewportUI.java | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/libjava/classpath/javax/swing/plaf/basic/BasicViewportUI.java b/libjava/classpath/javax/swing/plaf/basic/BasicViewportUI.java new file mode 100644 index 00000000000..8ce772bedf9 --- /dev/null +++ b/libjava/classpath/javax/swing/plaf/basic/BasicViewportUI.java @@ -0,0 +1,234 @@ +/* BasicViewportUI.java -- + Copyright (C) 2002, 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package javax.swing.plaf.basic; + +import java.awt.Component; +import java.awt.Dimension; +import java.awt.Graphics; +import java.awt.Image; +import java.awt.Point; +import java.awt.Rectangle; +import java.awt.image.ImageObserver; + +import javax.swing.JComponent; +import javax.swing.JViewport; +import javax.swing.ViewportLayout; +import javax.swing.event.ChangeEvent; +import javax.swing.event.ChangeListener; +import javax.swing.plaf.ComponentUI; +import javax.swing.plaf.ViewportUI; + +public class BasicViewportUI extends ViewportUI +{ + + ChangeListener changeListener; + Image backingStoreImage; + int backingStoreWidth = -1; + int backingStoreHeight = -1; + + class ChangeHandler implements ChangeListener + { + public void stateChanged(ChangeEvent event) + { + JViewport v = (JViewport) event.getSource(); + v.repaint(); + } + } + + void installDefaults(JComponent c) + { + c.setOpaque(true); + } + + void uninstallDefaults(JComponent c) + { + } + + void installListeners(JComponent c) + { + ((JViewport)c).addChangeListener(changeListener); + } + + void uninstallListeners(JComponent c) + { + ((JViewport)c).removeChangeListener(changeListener); + } + + public BasicViewportUI() + { + changeListener = new ChangeHandler(); + } + + public static ComponentUI createUI(JComponent c) + { + return new BasicViewportUI(); + } + + public void installUI(JComponent c) + { + super.installUI(c); + installListeners(c); + } + + public void uninstallUI(JComponent c) + { + uninstallListeners(c); + } + + + public Dimension getPreferredSize(JComponent c) + { + // let the ViewportLayout decide + return null; + } + + public void paint(Graphics g, JComponent c) + { + JViewport port = (JViewport)c; + Component view = port.getView(); + + if (view == null) + return; + + Point pos = port.getViewPosition(); + Rectangle viewBounds = view.getBounds(); + Rectangle portBounds = port.getBounds(); + + if (viewBounds.width == 0 + || viewBounds.height == 0 + || portBounds.width == 0 + || portBounds.height == 0) + return; + + switch (port.getScrollMode()) + { + + case JViewport.BACKINGSTORE_SCROLL_MODE: + paintBackingStore(g, port, view, pos, viewBounds, portBounds); + break; + + case JViewport.BLIT_SCROLL_MODE: + // FIXME: implement separate blit mode + + case JViewport.SIMPLE_SCROLL_MODE: + default: + paintSimple(g, port, view, pos, viewBounds, portBounds); + break; + } + } + + private void paintSimple(Graphics g, + JViewport v, + Component view, + Point pos, + Rectangle viewBounds, + Rectangle portBounds) + { + Rectangle oldClip = g.getClipBounds (); + g.setClip (oldClip.intersection (viewBounds)); + g.translate (-pos.x, -pos.y); + try + { + view.paint(g); + } + finally + { + g.translate (pos.x, pos.y); + g.setClip (oldClip); + } + } + + private void paintBackingStore(Graphics g, + JViewport v, + Component view, + Point pos, + Rectangle viewBounds, + Rectangle portBounds) + { + if (backingStoreImage == null + || backingStoreWidth != viewBounds.width + || backingStoreHeight != viewBounds.height) + { + backingStoreImage = v.createImage(viewBounds.width, viewBounds.height); + backingStoreWidth = viewBounds.width; + backingStoreHeight = viewBounds.height; + } + + Graphics g2 = backingStoreImage.getGraphics(); + + if (v.getBackground() != null) + { + // fill the backing store background + java.awt.Color save = g2.getColor(); + g2.setColor(v.getBackground()); + g2.fillRect (0, 0, backingStoreWidth, backingStoreHeight); + g2.setColor(save); + + // fill the viewport background + save = g.getColor(); + g.setColor(v.getBackground()); + g.fillRect (0, 0, portBounds.width, portBounds.height); + g.setColor(save); + + } + else + { + // clear the backing store background + g2.clearRect(0, 0, backingStoreWidth, backingStoreHeight); + + // clear the viewport background + g.clearRect(0, 0, portBounds.width, portBounds.height); + } + + g2.setClip(g.getClipBounds()); + g2.translate(-pos.x, -pos.y); + try + { + view.paint(g2); + } + finally + { + g2.translate(pos.x, pos.y); + } + g2 = null; + g.drawImage(backingStoreImage, + 0, 0, + (ImageObserver)null); + } +} |