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  1. JDK
  2. JDK-6806830

Bogus MouseDragged events when using a FileDialog

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    Details

    • Type: Bug
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 6u10
    • Fix Version/s: None
    • Component/s: client-libs
    • Labels:
    • Subcomponent:
    • Understanding:
      Cause Known
    • CPU:
      x86
    • OS:
      windows_xp

      Description

      FULL PRODUCT VERSION :
      java version "1.6.0_11"
      Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
      Java HotSpot(TM) Client VM (build 11.0-b16, mixed mode, sharing)

      ADDITIONAL OS VERSION INFORMATION :
      Microsoft Windows XP [Version 5.1.2600]

      A DESCRIPTION OF THE PROBLEM :
      In an AWT application with a canvas and FileDialog when the FileDialog is positioned over the canvas and the user double-click on a file to open it a MOUSE_DRAGGED event is generated on the canvas.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Start application, select load from the File menu, position dialog so its over the white canvas. Double-click on a file which is over the canvas.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      No MOUSE_DRAGGED/MOUSE_RELEASED events generated.
      ACTUAL -
      1233773918625 Load
      1233773923843 C:\eclipse\workspace\wallpaper\simpleImages\/verticleLine.png
      1233773923937 Load finished
      1233773923843 java.awt.event.MouseEvent[MOUSE_ENTERED,(111,125),absolute(361,172),button=0,modifiers=Button1,extModifiers=Button1,clickCount=0] on canvas0
      1233773923843 java.awt.event.MouseEvent[MOUSE_DRAGGED,(111,125),absolute(361,172),button=0,modifiers=Button1,extModifiers=Button1,clickCount=0] on canvas0
      1233773923906 java.awt.event.MouseEvent[MOUSE_RELEASED,(111,125),absolute(361,172),button=1,modifiers=Button1,clickCount=0] on canvas0


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import java.awt.Canvas;
      import java.awt.Color;
      import java.awt.FileDialog;
      import java.awt.Frame;
      import java.awt.Menu;
      import java.awt.MenuBar;
      import java.awt.MenuItem;
      import java.awt.Panel;
      import java.awt.event.ActionEvent;
      import java.awt.event.ActionListener;
      import java.awt.event.MouseEvent;
      import java.awt.event.MouseListener;
      import java.awt.event.MouseMotionListener;

      public class MouseDraggedBug extends Panel implements ActionListener, MouseMotionListener, MouseListener {
          private static final long serialVersionUID = 1L;
          Frame frame;
          
          public MouseDraggedBug(Frame frame) {
              this.frame = frame;
          }

          public static void main(String progargs[]) {
              Frame mainFrame = new Frame("Wallpaper patterns");
              int w=800,h=600;
              mainFrame.setBounds(0, 0, w, h);
              MouseDraggedBug app = new MouseDraggedBug(mainFrame);
              mainFrame.add(app);
              mainFrame.setMenuBar(app.buildMenu());
              app.init();
              mainFrame.setVisible(true);
          }

          public MenuBar buildMenu() {
              MenuBar mb = new MenuBar();

              Menu fileMenu = new Menu("File");

              MenuItem loadMI = new MenuItem("Load");
              loadMI.addActionListener(this);
              fileMenu.add(loadMI);
              mb.add(fileMenu);
              return mb;
          }

          
          public void init() {
               this.setBackground(Color.DARK_GRAY);
               Canvas c = new Canvas();
               c.setSize(300, 300);
               c.setBackground(Color.WHITE);
               c.addMouseMotionListener(this);
               c.addMouseListener(this);
               this.add(c);
               this.validate();
          }

          @Override
          public void actionPerformed(ActionEvent e) {
              System.out.println(""+System.currentTimeMillis()+"\tLoad");
              FileDialog fd = new FileDialog(frame, "Load image",
                      FileDialog.LOAD);
              fd.setVisible(true);
              String dir = fd.getDirectory();
              String filename = fd.getFile();
              System.out.println(""+System.currentTimeMillis()+"\t"+dir+"/"+filename);
              try {
                  Thread.sleep(100);
              } catch (InterruptedException e1) {
                  e1.printStackTrace();
              }
              System.out.println(""+System.currentTimeMillis()+"\tLoad finished");
          }

          @Override
          public void mouseDragged(MouseEvent e) {
              System.out.println(""+e.getWhen()+"\t"+e);
          }

          @Override
          public void mouseMoved(MouseEvent e) {
              System.out.println(""+e.getWhen()+"\t"+e);
          }

          @Override
          public void mouseClicked(MouseEvent e) {
              System.out.println(""+e.getWhen()+"\t"+e);
          }

          @Override
          public void mouseEntered(MouseEvent e) {
              System.out.println(""+e.getWhen()+"\t"+e);
          }

          @Override
          public void mouseExited(MouseEvent e) {
              System.out.println(""+e.getWhen()+"\t"+e);
          }

          @Override
          public void mousePressed(MouseEvent e) {
              System.out.println(""+e.getWhen()+"\t"+e);
          }

          @Override
          public void mouseReleased(MouseEvent e) {
              System.out.println(""+e.getWhen()+"\t"+e);
          }
      }
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Maintain a private boolean flag recording MousePressed/MouseReleased status.
      Disregard MouseDragged events unless proceeded by a MousePressed.

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              Assignee:
              dav Andrei Dmitriev (Inactive)
              Reporter:
              ndcosta Nelson Dcosta (Inactive)
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