| /* GLightweightPeer.java -- |
| Copyright (C) 2003, 2004, 2006 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 gnu.java.awt.peer; |
| |
| import java.awt.AWTEvent; |
| import java.awt.AWTException; |
| import java.awt.BufferCapabilities; |
| import java.awt.Color; |
| import java.awt.Component; |
| import java.awt.Cursor; |
| import java.awt.Dimension; |
| import java.awt.Font; |
| import java.awt.FontMetrics; |
| import java.awt.Graphics; |
| import java.awt.GraphicsConfiguration; |
| import java.awt.Image; |
| import java.awt.Insets; |
| import java.awt.Point; |
| import java.awt.Rectangle; |
| import java.awt.Toolkit; |
| import java.awt.event.MouseAdapter; |
| import java.awt.event.MouseEvent; |
| import java.awt.event.PaintEvent; |
| import java.awt.image.ColorModel; |
| import java.awt.image.ImageObserver; |
| import java.awt.image.ImageProducer; |
| import java.awt.image.VolatileImage; |
| import java.awt.peer.ComponentPeer; |
| import java.awt.peer.ContainerPeer; |
| import java.awt.peer.LightweightPeer; |
| |
| /* |
| * Another possible implementation strategy for lightweight peers is |
| * to make GLightweightPeer a placeholder class that implements |
| * LightweightPeer. Then the Component and Container classes could |
| * identify a peer as lightweight and handle it specially. The |
| * current approach is probably more clear but less efficient. |
| */ |
| |
| /** |
| * A stub class that implements the ComponentPeer and ContainerPeer |
| * interfaces using callbacks into the Component and Container |
| * classes. GLightweightPeer allows the Component and Container |
| * classes to treat lightweight and heavyweight peers in the same way. |
| * |
| * Lightweight components are painted directly onto their parent |
| * containers through an Image object provided by the toolkit. |
| */ |
| public class GLightweightPeer |
| implements LightweightPeer, ContainerPeer |
| { |
| private Component comp; |
| |
| private Insets containerInsets; |
| |
| public GLightweightPeer(Component comp) |
| { |
| this.comp = comp; |
| } |
| |
| // -------- java.awt.peer.ContainerPeer implementation: |
| |
| public Insets insets() |
| { |
| return getInsets (); |
| } |
| |
| public Insets getInsets() |
| { |
| if (containerInsets == null) |
| containerInsets = new Insets (0,0,0,0); |
| return containerInsets; |
| } |
| |
| public void beginValidate() |
| { |
| } |
| |
| public void endValidate() |
| { |
| } |
| |
| public void beginLayout() |
| { |
| } |
| |
| public void endLayout() |
| { |
| } |
| |
| public boolean isPaintPending() |
| { |
| return false; |
| } |
| |
| // -------- java.awt.peer.ComponentPeer implementation: |
| |
| public int checkImage(Image img, int width, int height, ImageObserver o) |
| { |
| return comp.getToolkit().checkImage(img, width, height, o); |
| } |
| |
| public Image createImage(ImageProducer prod) |
| { |
| return comp.getToolkit().createImage(prod); |
| } |
| |
| /* This method is not called. */ |
| public Image createImage(int width, int height) |
| { |
| return null; |
| } |
| |
| public void disable() {} |
| |
| public void dispose() {} |
| |
| public void enable() {} |
| |
| public GraphicsConfiguration getGraphicsConfiguration() |
| { |
| return null; |
| } |
| |
| public FontMetrics getFontMetrics(Font f) |
| { |
| return comp.getToolkit().getFontMetrics(f); |
| } |
| |
| /* Returning null here tells the Component object that called us to |
| * use its parent's Graphics. */ |
| public Graphics getGraphics() |
| { |
| return null; |
| } |
| |
| public Point getLocationOnScreen() |
| { |
| Point parentLocation = comp.getParent().getLocationOnScreen(); |
| return new Point (parentLocation.x + comp.getX(), |
| parentLocation.y + comp.getY()); |
| } |
| |
| public Dimension getMinimumSize() |
| { |
| return new Dimension(comp.getWidth(), comp.getHeight()); |
| } |
| |
| /* A lightweight component's preferred size is equivalent to its |
| * Component width and height values. */ |
| public Dimension getPreferredSize() |
| { |
| return new Dimension(comp.getWidth(), comp.getHeight()); |
| } |
| |
| /* Returning null here tells the Component object that called us to |
| * use its parent's Toolkit. */ |
| public Toolkit getToolkit() |
| { |
| return null; |
| } |
| |
| public void handleEvent(AWTEvent e) {} |
| |
| public void hide() {} |
| |
| public boolean isFocusable() |
| { |
| return false; |
| } |
| |
| public boolean isFocusTraversable() |
| { |
| return false; |
| } |
| |
| public Dimension minimumSize() |
| { |
| return getMinimumSize(); |
| } |
| |
| public Dimension preferredSize() |
| { |
| return getPreferredSize(); |
| } |
| |
| public void paint(Graphics graphics) {} |
| |
| public boolean prepareImage(Image img, int width, int height, |
| ImageObserver o) |
| { |
| return comp.getToolkit().prepareImage(img, width, height, o); |
| } |
| |
| public void print(Graphics graphics) {} |
| |
| public void repaint(long tm, int x, int y, int width, int height) |
| { |
| Component p = comp.getParent(); |
| if (p != null) |
| p.repaint(tm, x + comp.getX(), y + comp.getY(), width, height); |
| } |
| |
| public void requestFocus() {} |
| |
| public boolean requestFocus(Component source, boolean bool1, boolean bool2, long x) |
| { |
| return false; |
| } |
| |
| public void reshape(int x, int y, int width, int height) {} |
| |
| public void setBackground(Color color) {} |
| |
| public void setBounds(int x, int y, int width, int height) {} |
| |
| /** |
| * Sets the cursor on the heavy-weight parent peer. |
| * Called by the MouseListener on mouse enter. |
| */ |
| public void setCursor(Cursor cursor) |
| { |
| Component p = comp.getParent(); |
| while (p != null && p.isLightweight()) |
| p = p.getParent(); |
| |
| if (p != null) |
| { |
| // Don't actually change the cursor of the component |
| // otherwise other childs inherit this cursor. |
| ComponentPeer peer = p.getPeer(); |
| if (peer != null) |
| peer.setCursor(cursor); |
| } |
| } |
| |
| public void setEnabled(boolean enabled) {} |
| |
| public void setEventMask(long eventMask) {} |
| |
| public void setFont(Font font) {} |
| |
| public void setForeground(Color color) {} |
| |
| public void setVisible(boolean visible) {} |
| |
| public void show() {} |
| |
| public ColorModel getColorModel () |
| { |
| return comp.getColorModel (); |
| } |
| |
| public boolean isObscured() |
| { |
| return false; |
| } |
| |
| public boolean canDetermineObscurity() |
| { |
| return false; |
| } |
| |
| public void coalescePaintEvent(PaintEvent e) { } |
| |
| public void updateCursorImmediately() { } |
| |
| public VolatileImage createVolatileImage(int width, int height) |
| { |
| return null; |
| } |
| |
| public boolean handlesWheelScrolling() |
| { |
| return false; |
| } |
| |
| public void createBuffers(int x, BufferCapabilities capabilities) |
| throws AWTException { } |
| |
| public Image getBackBuffer() |
| { |
| return null; |
| } |
| |
| public void flip(BufferCapabilities.FlipContents contents) { } |
| |
| public void destroyBuffers() { } |
| |
| public boolean isRestackSupported() |
| { |
| return false; |
| } |
| |
| public void cancelPendingPaint(int x, int y, int width, int height) |
| { |
| |
| } |
| |
| public void restack() |
| { |
| |
| } |
| |
| public Rectangle getBounds() |
| { |
| return null; |
| } |
| |
| public void reparent(ContainerPeer parent) |
| { |
| |
| } |
| |
| public void setBounds(int x, int y, int z, int width, int height) |
| { |
| |
| } |
| |
| public boolean isReparentSupported() |
| { |
| return false; |
| } |
| |
| public void layout() |
| { |
| |
| } |
| } |