/[classpath]/classpath/java/awt/Panel.java
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revision 1.8 by mkoch, Tue Jun 3 16:40:37 2003 UTC revision 1.9 by mark, Thu Jul 22 19:45:38 2004 UTC
# Line 38  exception statement from your version. * Line 38  exception statement from your version. *
38    
39  package java.awt;  package java.awt;
40    
41    import java.awt.event.PaintEvent;
42  import javax.accessibility.Accessible;  import javax.accessibility.Accessible;
43  import javax.accessibility.AccessibleContext;  import javax.accessibility.AccessibleContext;
44  import javax.accessibility.AccessibleRole;  import javax.accessibility.AccessibleRole;
# Line 62  public class Panel extends Container imp Line 63  public class Panel extends Container imp
63    /** The cached accessible context. */    /** The cached accessible context. */
64    private transient AccessibleContext context;    private transient AccessibleContext context;
65    
66      /** Flag set when the first system-requested paint event is
67          dispatched. */
68      private transient boolean initialSystemUpdateDone;
69    
70      /** Flag set when the first application-requested paint event is
71          consumed. */
72      private transient boolean initialUpdateConsumed;
73    
74      /*
75       * The number used to generate the name returned by getName.
76       */
77      private static transient long next_panel_number = 0;
78    
79    /**    /**
80     * Initializes a new instance of <code>Panel</code> that has a default     * Initializes a new instance of <code>Panel</code> that has a default
81     * layout manager of <code>FlowLayout</code>.     * layout manager of <code>FlowLayout</code>.
# Line 84  public class Panel extends Container imp Line 98  public class Panel extends Container imp
98    }    }
99    
100    /**    /**
101       * Consume initial application-requested paint event if it has not
102       * already been consumed, and if the initial system-requested paint
103       * event has not already been handled.  Otherwise, call
104       * super.dispatchEventImpl.  These extra steps are required to
105       * prevent a Panel from being painted twice when it is initially
106       * shown.
107       *
108       * @param e the event to dispatch
109       */
110      void dispatchEventImpl (AWTEvent e)
111      {
112        if (e instanceof PaintEvent)
113          {
114            if (e.id == PaintEvent.UPDATE)
115              {
116                if (!initialUpdateConsumed
117                    && !initialSystemUpdateDone)
118                  {
119                    e.consume ();
120                    initialUpdateConsumed = true;
121                  }
122              }
123            else if (e.id == PaintEvent.PAINT)
124              initialSystemUpdateDone = true;
125          }
126        else
127          super.dispatchEventImpl (e);
128      }
129    
130      /**
131     * Notifies this object to create its native peer.     * Notifies this object to create its native peer.
132     *     *
133     * @see #isDisplayable()     * @see #isDisplayable()
# Line 141  public class Panel extends Container imp Line 185  public class Panel extends Container imp
185      {      {
186        return AccessibleRole.PANEL;        return AccessibleRole.PANEL;
187      }      }
188    } // class AccessibleAWTPanel    }
189  } // class Panel  
190      /**
191       * Generate a unique name for this panel.
192       *
193       * @return A unique name for this panel.
194       */
195      String generateName ()
196      {
197        return "panel" + getUniqueLong ();
198      }
199    
200      private static synchronized long getUniqueLong ()
201      {
202        return next_panel_number++;
203      }
204    }

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