java.awt.event.InputEvent.BUTTON1_MASK not set properly for event delivered to

Name: sgC58550 Date: 05/14/97


Click with primary button on mouse,
Modifier on MouseEvent received by listener in mousePressed, mouseClicked
does not have BUTTON1_MASK set.

Here are three files to make an applet/application under 1.1
which exhibits the bug, and the work-around.

////
//// Begin WindowEngine.java
/////

import java.applet.*;
import java.awt.*;

public class WindowEngine extends Applet
{
//Data members
MainFrame mainFrame = null; //the window in which the frames will be embedded

//Initialization methods
public void init()
{
mainFrame = new MainFrame("MainFrame");
mainFrame.show();
}

public static void main(String args[])
{
WindowEngine applet = new WindowEngine();
applet.init();
}
}; //class WindowEngine

////
//// End WindowEngine.java
/////


///////
////// Begin MainFrame.java
//////

import java.applet.*;
import java.awt.*;
import java.util.*;

public class MainFrame extends Frame
{
//Data Members
MainPanel mainPanel;

//Initialization methods
public MainFrame(String title)
{
super(title);

reshape(100, 50, 800, 400);

// create layout
this.setLayout(new BorderLayout(0, 0));

// create menu (so we can quit)
MenuBar menuBar = new MenuBar();
Menu file = new Menu("File", true);
menuBar.add(file);
file.add("Quit");
this.setMenuBar(menuBar);

// create main panel for contained items
// we use this so that mouse coordinates map directly into screen coordinates
// (corresponding to the origin of mainPanel)
mainPanel = new MainPanel(this);

this.add("Center", mainPanel);
}

public boolean action(Event e, Object arg)
{
if(e.target instanceof MenuItem)
{
String label = (String) arg;
if(label.equals("Quit"))
{
System.exit(0);
}
}
return false;
}

}; //class MainFrame

///////
////// end MainFrame.java
//////

///////
////// begin MainPanel.java
//////

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class MainPanel extends Panel
    implements MouseListener, MouseMotionListener

{
// Data Members
Frame m_parentFrame;

// Mouse select info
int m_x, m_y, m_nWidth, m_nHeight;

public MainPanel(Frame parentFrame)
{
super();

m_parentFrame = parentFrame;

// create layout
this.setLayout(new BorderLayout(0, 0));

addMouseListener(this);
addMouseMotionListener(this);
}

public void paint(Graphics g)
{
super.paint(g);
    }

    protected void studyModifiers(MouseEvent e)
    {
        int Modifiers = e.getModifiers();

        if (( Modifiers & MouseEvent.BUTTON1_MASK) != 0)
        {
            System.out.println("\tButton1 is down");
        }

        if (( Modifiers & MouseEvent.BUTTON2_MASK) != 0)
        {
            System.out.println("\tButton2 is down");
        }

        if (( Modifiers & MouseEvent.BUTTON3_MASK) != 0)
        {
            System.out.println("\tButton3 is down");
        }



    }

    /**
     * Invoked when the mouse has been clicked on a component.
     **/
    public void mouseClicked(MouseEvent e)
    {

        System.out.println("mouseClicked " + e.getClickCount() + " times");
        studyModifiers(e);
    }

    /**
     * Invoked when a mouse button has been pressed on a component.
     **/
    public void mousePressed(MouseEvent e)
    {
        System.out.println("mousePressed");

        if ( (e.getModifiers() & (MouseEvent.BUTTON3_MASK | MouseEvent.BUTTON2_MASK)) == 0)
         {
            System.out.println("\tWORKAROUND Button 1 is down");
        }

        studyModifiers(e);

    }

    /**
     * Invoked when a mouse button has been released on a component.
     **/
    public void mouseReleased(MouseEvent e)
    {
        System.out.println("mouseReleased");
        studyModifiers(e);

    }

    /**
     * Invoked when the mouse enters a component.
     **/
    public void mouseEntered(MouseEvent e)
    {
        System.out.println("mouseEntered");
        studyModifiers(e);


    }

    /**
     * Invoked when the mouse exits a component.
     **/
    public void mouseExited(MouseEvent e)
    {
        System.out.println("mouseExited");
        studyModifiers(e);

    }


    ///////////////////////////////////////////////////////////////////////////////////
    //// MouseMotionListener
    ///////////////////////////////////////////////////////////////////////////////////

    /**
     * Invoked when a mouse button is pressed on a component and then dragged.
     * Mouse drag events will continue to be delivered to the component where the first originated
     * until the mouse button is released (regardless of whether the mouse position
     * is within the bounds of the component).
     **/
    public void mouseDragged(MouseEvent e)
    {
        // Update the dragging feedback.
        System.out.println(" mouseDragged");
        studyModifiers(e);

    }

    /**
     * Invoked when the mouse button has been moved on a component (with no buttons no down).
     **/
    public void mouseMoved(MouseEvent e)
    {
        System.out.println(" mouseMoved");
        studyModifiers(e);

    }
} //class MainPanel

///
/// end MainPanel.java
///

company - Corel Corporation
======================================================================