mirror of git://gcc.gnu.org/git/gcc.git
501 lines
14 KiB
Java
501 lines
14 KiB
Java
/* ComponentPeer.java -- Toplevel component peer
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Copyright (C) 1999, 2000, 2002 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 java.awt.peer;
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import java.awt.AWTEvent;
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import java.awt.AWTException;
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import java.awt.BufferCapabilities;
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import java.awt.Color;
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import java.awt.Component;
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import java.awt.Cursor;
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import java.awt.Dimension;
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import java.awt.Font;
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import java.awt.FontMetrics;
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import java.awt.Graphics;
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import java.awt.GraphicsConfiguration;
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import java.awt.Image;
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import java.awt.Point;
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import java.awt.Rectangle;
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import java.awt.Toolkit;
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import java.awt.event.PaintEvent;
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import java.awt.image.ColorModel;
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import java.awt.image.ImageObserver;
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import java.awt.image.ImageProducer;
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import java.awt.image.VolatileImage;
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/**
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* Defines the methods that a component peer is required to implement.
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*/
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public interface ComponentPeer
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{
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/**
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* Returns the construction status of the specified image. This is called
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* by {@link Component#checkImage(Image, int, int, ImageObserver)}.
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*
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* @param img the image
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* @param width the width of the image
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* @param height the height of the image
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* @param ob the image observer to be notified of updates of the status
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*
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* @return a bitwise ORed set of ImageObserver flags
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*/
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int checkImage(Image img, int width, int height,
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ImageObserver ob);
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/**
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* Creates an image by starting the specified image producer. This is called
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* by {@link Component#createImage(ImageProducer)}.
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*
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* @param prod the image producer to be used to create the image
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*
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* @return the created image
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*/
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Image createImage(ImageProducer prod);
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/**
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* Creates an empty image with the specified <code>width</code> and
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* <code>height</code>.
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*
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* @param width the width of the image to be created
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* @param height the height of the image to be created
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*
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* @return the created image
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*/
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Image createImage(int width, int height);
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/**
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* Disables the component. This is called by {@link Component#disable()}.
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*/
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void disable();
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/**
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* Disposes the component peer. This should release all resources held by the
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* peer. This is called when the component is no longer in use.
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*/
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void dispose();
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/**
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* Enables the component. This is called by {@link Component#enable()}.
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*/
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void enable();
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/**
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* Returns the color model of the component. This is currently not used.
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*
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* @return the color model of the component
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*/
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ColorModel getColorModel();
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/**
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* Returns the font metrics for the specified font. This is called by
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* {@link Component#getFontMetrics(Font)}.
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*
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* @param f the font for which to query the font metrics
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*
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* @return the font metrics for the specified font
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*/
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FontMetrics getFontMetrics(Font f);
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/**
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* Returns a {@link Graphics} object suitable for drawing on this component.
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* This is called by {@link Component#getGraphics()}.
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*
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* @return a graphics object suitable for drawing on this component
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*/
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Graphics getGraphics();
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/**
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* Returns the location of this component in screen coordinates. This is
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* called by {@link Component#getLocationOnScreen()}.
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*
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* @return the location of this component in screen coordinates
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*/
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Point getLocationOnScreen();
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/**
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* Returns the minimum size for the component. This is called by
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* {@link Component#getMinimumSize()}.
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*
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* @return the minimum size for the component
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*/
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Dimension getMinimumSize();
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/**
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* Returns the preferred size for the component. This is called by
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* {@link Component#getPreferredSize()}.
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*
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* @return the preferred size for the component
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*/
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Dimension getPreferredSize();
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/**
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* Returns the toolkit that created this peer.
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*
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* @return the toolkit that created this peer
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*/
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Toolkit getToolkit();
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/**
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* Handles the given event. This is called from
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* {@link Component#dispatchEvent(AWTEvent)} to give the peer a chance to
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* react to events for the component.
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*
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* @param e the event
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*/
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void handleEvent(AWTEvent e);
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/**
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* Makes the component invisible. This is called from
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* {@link Component#hide()}.
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*/
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void hide();
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/**
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* Returns <code>true</code> if the component can receive keyboard input
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* focus. This is called from {@link Component#isFocusTraversable()}.
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*
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* @specnote Part of the earlier 1.1 API, replaced by isFocusable().
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*/
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boolean isFocusTraversable();
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/**
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* Returns <code>true</code> if the component can receive keyboard input
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* focus. This is called from {@link Component#isFocusable()}.
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*/
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boolean isFocusable();
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/**
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* Returns the minimum size for the component. This is called by
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* {@link Component#minimumSize()}.
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*
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* @return the minimum size for the component
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*/
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Dimension minimumSize();
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/**
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* Returns the preferred size for the component. This is called by
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* {@link Component#getPreferredSize()}.
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*
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* @return the preferred size for the component
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*/
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Dimension preferredSize();
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void paint(Graphics graphics);
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/**
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* Prepares an image for rendering on this component. This is called by
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* {@link Component#prepareImage(Image, int, int, ImageObserver)}.
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*
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* @param img the image to prepare
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* @param width the desired width of the rendered image
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* @param height the desired height of the rendered image
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* @param ob the image observer to be notified of updates in the preparation
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* process
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*
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* @return <code>true</code> if the image has been fully prepared,
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* <code>false</code> otherwise (in which case the image observer
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* receives updates)
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*/
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boolean prepareImage(Image img, int width, int height,
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ImageObserver ob);
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void print(Graphics graphics);
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/**
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* Repaints the specified rectangle of this component. This is called from
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* {@link Component#repaint(long, int, int, int, int)}.
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*
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* @param tm number of milliseconds to wait with repainting
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* @param x the X coordinate of the upper left corner of the damaged rectangle
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* @param y the Y coordinate of the upper left corner of the damaged rectangle
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* @param width the width of the damaged rectangle
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* @param height the height of the damaged rectangle
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*/
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void repaint(long tm, int x, int y, int width, int height);
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/**
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* Requests that this component receives the focus. This is called from
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* {@link Component#requestFocus()}.
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*
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* @specnote Part of the earlier 1.1 API, apparently replaced by argument
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* form of the same method.
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*/
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void requestFocus();
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/**
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* Requests that this component receives the focus. This is called from
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* {@link Component#requestFocus()}.
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*
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* @param source TODO
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* @param bool1 TODO
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* @param bool2 TODO
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* @param x TODO
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*/
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boolean requestFocus(Component source, boolean bool1, boolean bool2, long x);
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/**
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* Notifies the peer that the bounds of this component have changed. This
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* is called by {@link Component#reshape(int, int, int, int)}.
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*
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* @param x the X coordinate of the upper left corner of the component
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* @param y the Y coordinate of the upper left corner of the component
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* @param width the width of the component
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* @param height the height of the component
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*/
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void reshape(int x, int y, int width, int height);
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/**
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* Sets the background color of the component. This is called by
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* {@link Component#setBackground(Color)}.
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*
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* @param color the background color to set
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*/
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void setBackground(Color color);
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/**
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* Notifies the peer that the bounds of this component have changed. This
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* is called by {@link Component#setBounds(int, int, int, int)}.
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*
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* @param x the X coordinate of the upper left corner of the component
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* @param y the Y coordinate of the upper left corner of the component
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* @param width the width of the component
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* @param height the height of the component
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*/
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void setBounds(int x, int y, int width, int height);
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/**
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* Sets the cursor of the component. This is called by
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* {@link Component#setCursor(Cursor)}.
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*
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* @specnote Part of the earlier 1.1 API, apparently no longer needed.
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*/
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void setCursor(Cursor cursor);
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/**
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* Sets the enabled/disabled state of this component. This is called by
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* {@link Component#setEnabled(boolean)}.
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*
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* @param enabled <code>true</code> to enable the component,
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* <code>false</code> to disable it
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*/
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void setEnabled(boolean enabled);
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/**
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* Sets the font of the component. This is called by
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* {@link Component#setFont(Font)}.
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*
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* @param font the font to set
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*/
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void setFont(Font font);
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/**
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* Sets the foreground color of the component. This is called by
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* {@link Component#setForeground(Color)}.
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*
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* @param color the foreground color to set
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*/
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void setForeground(Color color);
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/**
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* Sets the visibility state of the component. This is called by
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* {@link Component#setVisible(boolean)}.
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*
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* @param visible <code>true</code> to make the component visible,
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* <code>false</code> to make it invisible
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*/
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void setVisible(boolean visible);
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/**
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* Makes the component visible. This is called by {@link Component#show()}.
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*/
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void show();
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/**
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* Get the graphics configuration of the component. The color model
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* of the component can be derived from the configuration.
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*
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* @return the graphics configuration of the component
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*/
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GraphicsConfiguration getGraphicsConfiguration();
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/**
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* Part of an older API, no longer needed.
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*/
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void setEventMask(long mask);
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/**
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* Returns <code>true</code> if this component has been obscured,
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* <code>false</code> otherwise. This will only work if
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* {@link #canDetermineObscurity()} also returns <code>true</code>.
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*
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* @return <code>true</code> if this component has been obscured,
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* <code>false</code> otherwise.
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*/
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boolean isObscured();
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/**
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* Returns <code>true</code> if this component peer can determine if the
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* component has been obscured, <code>false</code> otherwise.
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*
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* @return <code>true</code> if this component peer can determine if the
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* component has been obscured, <code>false</code> otherwise
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*/
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boolean canDetermineObscurity();
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/**
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* Coalesces the specified paint event.
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*
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* @param e the paint event
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*/
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void coalescePaintEvent(PaintEvent e);
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/**
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* Updates the cursor.
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*/
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void updateCursorImmediately();
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/**
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* Returns true, if this component can handle wheel scrolling,
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* <code>false</code> otherwise.
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*
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* @return true, if this component can handle wheel scrolling,
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* <code>false</code> otherwise
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*/
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boolean handlesWheelScrolling();
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/**
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* A convenience method that creates a volatile image. The volatile
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* image is created on the screen device on which this component is
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* displayed, in the device's current graphics configuration.
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*
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* @param width width of the image
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* @param height height of the image
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*
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* @see VolatileImage
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*
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* @since 1.2
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*/
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VolatileImage createVolatileImage(int width, int height);
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/**
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* Create a number of image buffers that implement a buffering
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* strategy according to the given capabilities.
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*
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* @param numBuffers the number of buffers
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* @param caps the buffering capabilities
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*
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* @throws AWTException if the specified buffering strategy is not
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* implemented
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*
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* @since 1.2
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*/
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void createBuffers(int numBuffers, BufferCapabilities caps)
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throws AWTException;
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/**
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* Return the back buffer of this component.
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*
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* @return the back buffer of this component.
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*
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* @since 1.2
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*/
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Image getBackBuffer();
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/**
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* Perform a page flip, leaving the contents of the back buffer in
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* the specified state.
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*
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* @param contents the state in which to leave the back buffer
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*
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* @since 1.2
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*/
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void flip(BufferCapabilities.FlipContents contents);
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/**
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* Destroy the resources created by createBuffers.
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*
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* @since 1.2
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*/
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void destroyBuffers();
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/**
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* Get the bounds of this component peer.
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*
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* @return component peer bounds
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* @since 1.5
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*/
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Rectangle getBounds();
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/**
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* Reparent this component under another container.
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*
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* @param parent
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* @since 1.5
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*/
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void reparent(ContainerPeer parent);
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/**
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* Set the bounds of this component peer.
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*
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* @param x the new x co-ordinate
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* @param y the new y co-ordinate
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* @param width the new width
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* @param height the new height
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* @param z the new stacking level
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* @since 1.5
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*/
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void setBounds (int x, int y, int width, int height, int z);
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/**
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* Check if this component supports being reparented.
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*
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* @return true if this component can be reparented,
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* false otherwise.
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* @since 1.5
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*/
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boolean isReparentSupported();
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/**
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* Layout this component peer.
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*
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* @since 1.5
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*/
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void layout();
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}
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