Name: gvC48267 Date: 12/05/97


Oracle Licensee

On Win32, a modal dialog grabs input from all the existing frames of the
underlying application. On Solaris, a modal dialog grabs input only from
the parent frame. The JDK spec is pretty vague on wording what modality
means and how it should be implemented. Test case to reproduce the bug is
attached.
/*
 * ModalBug.java
 * Test case to reproduce inconsistent modality implementation bug.
 * Description
 * The AWT definition of setting "modal" flag to true in java.awt.Dialog
 * is as follows :
 * A modal Dialog grabs all the input to the parent frame from the user.
 * The JavaSoft's implementation on Win32 grabs input from all the frames
 * and not just the parent frame in the application. However, the
 * implementation on Solaris only grabs the input from the parent window.
 * One of the implementations needs to be changed for consistency.
 * How to reproduce :
 * - Compile ModalBug.java and run it
 * - you will see two windows, Parent and Frame1
 * - click on "show dialog" button in Parent (Parent is dialog's parent)
 * - this will bring up a modal dialog called "Dialog"
 * - On Win32, you won't be able to access Parent and Frame1 frames.
 * On Solaris, you will be able to access Frame1.
 * Author Sridhar Reddy (###@###.###), 12/3/1997
 */
import java.awt.Dialog;
import java.awt.Frame;
import java.awt.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class ModalBug implements ActionListener
{
  Frame parent; // parent frame
  Frame frame; // some frame
  Dialog dialog; // a modal dialog
  Button showDialog; // button to popup modal dialog
  Button printHello; // button to print hello to stdout
  // constructor - creates two frames and a modal dialog
  public ModalBug()
  {
    parent = new Frame("Parent");
    showDialog = new Button("show dialog");
    showDialog.addActionListener(this);
    parent.add(showDialog);
    parent.setSize(100, 100);
    parent.setLocation(1,1);
    dialog = new Dialog(parent, "Dialog", true);
    dialog.setSize(100, 100);
    dialog.setLocation(250, 150);
    frame = new Frame("Frame1");
    printHello = new Button("print hello");
    frame.add(printHello);
    printHello.addActionListener(this);
    frame.setSize(100, 100);
    frame.setLocation(120, 1);
  }
  // shows the frames
  public void show()
  {
    parent.setVisible(true);
    frame.setVisible(true);
  }
  // ActionListener implementation
  public void actionPerformed(ActionEvent event)
  {
    if (event.getSource() == showDialog)
      dialog.show();
    else
      System.out.println("print hello");
  }
  // test main
  public static void main(String[] args)
  {
    ModalBug bug = new ModalBug();
    bug.show();
  }
}
(Review ID: 21370)
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