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/* Panel.java -- Simple container object. |
/* Panel.java -- Simple container object |
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Copyright (C) 1999, 2002 Free Software Foundation, Inc. |
Copyright (C) 1999, 2002 Free Software Foundation, Inc. |
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This file is part of GNU Classpath. |
This file is part of GNU Classpath. |
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import java.awt.peer.PanelPeer; |
import java.awt.peer.PanelPeer; |
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import java.awt.peer.ContainerPeer; |
import java.awt.peer.ContainerPeer; |
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import java.awt.peer.ComponentPeer; |
import java.awt.peer.ComponentPeer; |
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import java.io.Serializable; |
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import javax.accessibility.Accessible; |
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import javax.accessibility.AccessibleContext; |
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import javax.accessibility.AccessibleRole; |
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/** |
/** |
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* A panel is a simple container class. |
* A panel is a simple container class. It's default layout is the |
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* <code>FlowLayout</code> manager. |
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* @author Aaron M. Renn (arenn@urbanophile.com) |
* |
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*/ |
* @author Aaron M. Renn <arenn@urbanophile.com> |
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public class Panel extends Container implements java.io.Serializable |
* @author Eric Blake <ebb9@email.byu.edu> |
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{ |
* @see FlowLayout |
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* @since 1.0 |
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/* |
* @status updated to 1.4 |
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* Constructors |
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*/ |
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/** |
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* Initializes a new instance of <code>Panel</code> that has a default |
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* layout manager of <code>FlowLayout</code>. |
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*/ |
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public |
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Panel() |
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{ |
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this(new FlowLayout()); |
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} |
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/*************************************************************************/ |
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/** |
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* Initializes a new instance of <code>Panel</code> with the specified |
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* layout manager. |
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* |
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* @param layoutManager The layout manager for this object. |
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*/ |
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public |
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Panel(LayoutManager layoutManager) |
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{ |
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setLayout(layoutManager); |
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} |
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/*************************************************************************/ |
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/* |
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* Instance Methods |
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*/ |
*/ |
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public class Panel extends Container implements Accessible |
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/** |
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* Notifies this object to create its native peer. |
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*/ |
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public void |
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addNotify() |
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{ |
{ |
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if (peer == null) |
/** |
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peer = getToolkit().createPanel(this); |
* Compatible with JDK 1.0+. |
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super.addNotify(); |
*/ |
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} |
private static final long serialVersionUID = -2728009084054400034L; |
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/** The cached accessible context. */ |
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private transient AccessibleContext context; |
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/** |
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* Initializes a new instance of <code>Panel</code> that has a default |
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* layout manager of <code>FlowLayout</code>. |
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*/ |
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public Panel() |
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{ |
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this(new FlowLayout()); |
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} |
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/** |
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* Initializes a new instance of <code>Panel</code> with the specified |
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* layout manager. |
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* |
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* @param layoutManager the layout manager for this object |
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* @since 1.1 |
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*/ |
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public Panel(LayoutManager layoutManager) |
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{ |
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setLayout(layoutManager); |
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} |
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/** |
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* Notifies this object to create its native peer. |
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* |
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* @see #isDisplayable() |
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* @see #removeNotify() |
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*/ |
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public void addNotify() |
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{ |
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if (peer == null) |
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peer = getToolkit().createPanel(this); |
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super.addNotify(); |
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} |
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/** |
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* Gets the AccessibleContext associated with this panel, creating one if |
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* necessary. This always returns an instance of {@link AccessibleAWTPanel}. |
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* |
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* @return the accessibility context of this panel |
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* @since 1.3 |
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*/ |
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public AccessibleContext getAccessibleContext() |
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{ |
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if (context == null) |
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context = new AccessibleAWTPanel(); |
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return context; |
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} |
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/** |
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* This class provides accessibility support for Panels, and is the |
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* runtime type returned by {@link #getAccessibleContext()}. |
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* |
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* @author Eric Blake <ebb9@email.byu.edu> |
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* @since 1.3 |
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*/ |
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protected class AccessibleAWTPanel extends AccessibleAWTContainer |
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{ |
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/** |
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* Compatible with JDK 1.4+. |
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*/ |
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private static final long serialVersionUID = -6409552226660031050L; |
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/** |
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* The default constructor. |
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*/ |
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protected AccessibleAWTPanel() |
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{ |
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} |
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/** |
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* Get the role of this accessible object, a panel. |
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* |
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* @return the role of the object |
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* @see AccessibleRole#PANEL |
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*/ |
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public AccessibleRole getAccessibleRole() |
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{ |
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return AccessibleRole.PANEL; |
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} |
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} // class AccessibleAWTPanel |
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} // class Panel |
} // class Panel |
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