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322 lines
9.8 KiB
Java
322 lines
9.8 KiB
Java
/* AccessibleComponent.java -- aids in accessibly rendering Java components
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Copyright (C) 2000, 2001, 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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.accessibility;
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import java.awt.Color;
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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.Point;
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import java.awt.Rectangle;
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import java.awt.event.FocusListener;
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/**
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* Objects which are to be rendered to a screen as part of a graphical
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* user interface should implement this interface. Accessibility
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* software can use the implementations of this interface to determine
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* and set the screen representation for an object.
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*
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* <p>The <code>AccessibleContext.getAccessibleComponent()</code> method
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* should return <code>null</code> if an object does not implement this
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* interface.
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*
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* @author Eric Blake <ebb9@email.byu.edu>
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* @see Accessible
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* @see AccessibleContext
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* @see AccessibleContext#getAccessibleComponent()
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* @since 1.2
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* @status updated to 1.4
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*/
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public interface AccessibleComponent
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{
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/**
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* Get the background color of this component.
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*
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* @return the background color of this component, or null if not supported
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* @see #setBackground(Color)
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*/
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Color getBackground();
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/**
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* Set the background color of this component to the specified color.
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*
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* @param color the color to set the background to
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* @see #getBackground()
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*/
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void setBackground(Color color);
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/**
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* Get the foreground color of this component.
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*
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* @return the foreground color of this component, or null if not supported
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* @see #setForeground(Color)
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*/
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Color getForeground();
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/**
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* Set the foreground color of this component.
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*
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* @param color the color to set the foreground to
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* @see #getForeground()
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*/
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void setForeground(Color color);
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/**
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* Get the cursor of this component.
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*
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* @return the Cursor of this component, or null if not supported
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* @see #setCursor(Cursor)
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*/
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Cursor getCursor();
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/**
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* Set the cursor of the component.
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*
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* @param cursor the graphical representation of the cursor to use
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* @see #getCursor()
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*/
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void setCursor(Cursor cursor);
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/**
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* Get the font of this component
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*
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* @return the font of the component, or null if not supported
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* @see setFont(Font)
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*/
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Font getFont();
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/**
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* Set the font of this component.
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*
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* @param font the font to use
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* @see #getFont()
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*/
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void setFont(Font font);
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/**
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* Get the <code>FontMetrics</code> of the specified font in this component.
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*
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* @param font the specified font
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* @return the metrics for the specified font, or null if not supported
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* @throws NullPointerException if font is null
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* @see #getFont()
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*/
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FontMetrics getFontMetrics(Font font);
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/**
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* Indicates whether or not this component is enabled. An object which is
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* enabled also has AccessibleState.ENABLED in its StateSet.
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*
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* @return true if the component is enabled
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* @see #setEnabled(boolean)
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* @see AccessibleContext#getAccessibleStateSet()
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* @see AccessibleState#ENABLED
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*/
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boolean isEnabled();
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/**
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* Set this component to an enabled or disabled state.
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*
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* @param b true to enable the component, else disable it
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* @see #isEnabled()
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*/
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void setEnabled(boolean b);
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/**
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* Indicates whether or not this component is visible or intends to be
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* visible although one of its ancestors may not be. An object which is
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* visible also has AccessibleState.VISIBLE in its StateSet. Check
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* <code>isShowing()</code> to see if the object is on screen.
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*
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* @return true if the component is visible
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* @see #setVisible(boolean)
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* @see AccessibleContext#getAccessibleStateSet()
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* @see AccessibleState#VISIBLE
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*/
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boolean isVisible();
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/**
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* Set the visible state of this component.
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*
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* @param b true to make the component visible, else hide it
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* @see #isVisible()
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*/
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void setVisible(boolean b);
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/**
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* Indicates whether or not this component is visible by checking
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* the visibility of this component and its ancestors. The component may
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* be hidden on screen by another component like pop-up help. An object
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* which is showing on screen also has AccessibleState.SHOWING in its
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* StateSet.
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*
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* @return true if component and ancestors are visible
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* @see #isVisible()
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* @see #setVisible(boolean)
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* @see AccessibleContext#getAccessibleStateSet()
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* @see AccessibleState#SHOWING
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*/
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boolean isShowing();
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/**
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* Tests whether or not the specified point is contained within
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* this component. The coordinates are specified relative to this
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* component's coordinate system.
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*
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* @param point the Point to locate
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* @return true if the point is within this component
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* @throws NullPointerException if point is null
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* @see #getBounds()
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*/
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boolean contains(Point point);
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/**
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* Get the location of this component in the screen's coordinate space.
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* The point specified is the top-left corner of this component.
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*
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* @return the location on screen, or null if off-screen
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* @see #getBounds()
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* @see #getLocation()
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*/
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Point getLocationOnScreen();
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/**
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* Get the location of this component in the parent's coordinate system.
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* The point specified is the top-left corner of this component.
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*
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* @return the location in the parent on screen, or null if off-screen
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* @see #getBounds()
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* @see #getLocationOnScreen()
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* @see #setLocation(Point)
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*/
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Point getLocation();
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/**
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* Set the location of this component relative to its parent. The point
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* specified represents the top-left corner of this component.
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*
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* @param point the top-left corner of this component relative to the parent
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* @throws NullPointerException if point is null
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* @see #getLocation()
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*/
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void setLocation(Point point);
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/**
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* Get the bounds of this component relative to its parent - it's width,
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* height, and relative location to its parent.
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*
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* @return the bounds of this component, or null if not on screen
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* @see #contains(Point)
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*/
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Rectangle getBounds();
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/**
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* Set the bounds of this component to the specified height and width, and
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* relative location to its parent.
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*
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* @param rectangle the new height, width, and relative location
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* @throws NullPointerException if rectangle is null
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*/
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void setBounds(Rectangle rectangle);
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/**
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* Get the size of this component - it's width and height.
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*
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* @return the dimensions of this component, or null if not on screen
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* @see #setSize(Dimension)
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*/
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Dimension getSize();
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/**
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* Set the size of this component to the given dimensions.
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*
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* @param dimension the new size of the component
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* @throws NullPointerException if dimension is null
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* @see #getSize()
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*/
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void setSize(Dimension dimension);
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/**
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* If an object exists at the specified point which is a child of this
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* parent component, and it is accessible, then it is returned.
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*
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* @param point the location within this component's coordinate system
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* @return the accessible child object at that point, or null
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*/
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Accessible getAccessibleAt(Point point);
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/**
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* Indicates whether or not this component can accept focus. An object
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* which can accept focus also has AccessibleState.FOCUSABLE in its
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* StateSet.
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*
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* @return true if the component can accept focus
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* @see AccessibleContext#getAccessibleStateSet()
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* @see AccessibleState#FOCUSABLE
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* @see AccessibleState#FOCUSED
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*/
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boolean isFocusTraversable();
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/**
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* If this method is called this component will attempt to gain focus,
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* but if it cannot accept focus nothing happens. On success, the StateSet
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* will contain AccessibleState.FOCUSED
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*
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* @see #isFocusTraversable()
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* @see AccessibleState#FOCUSED
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*/
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void requestFocus();
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/**
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* Adds the specified listener to this component.
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*
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* @param listener the listener to add to this component
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* @see #removeFocusListener(FocusListener)
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*/
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void addFocusListener(FocusListener listener);
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/**
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* Removes the specified listener from this component.
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*
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* @param listener the listener to remove
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* @see #addFocusListener(FocusListener)
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*/
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void removeFocusListener(FocusListener listener);
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} // interface AccessibleComponent
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