passing references

**willemjav** · 05-26-2013, 09:48 AM

-I am now at the following situation:
There are three classes A, B and C
A contains several dialogs
B is the base class that holds the main method
C has a large series of panels that should be painted

-At B I initialise objects of A and C: called a, c

-I get the reference of the dialog´s OK buttons of A at the base class B which
permits me to say:
if (a.OKbuttonPushed) get a.getDialogmaterial

-Next I can paint the panels at C according the dialog settings of A by saying (at B, the base class) c.paintPanels.

-But I also have a mouselistener installed at the C class which readsout an individual click on each of the panels and returns the number of that particular panel.

All the above is working just fine (with help of you at the forum)

Now I would like to readout these panel-numbers of C: in real time when they are click selected!

This means I should have the mouselistener of C at B and pass all the references of the panels at C to B as well, right ? What a fuss......

Or might there by another way doing this (like using a interface)?

**willemjav** · 05-26-2013, 12:03 PM

Just fantasising some more in having this class that
implements a interface that has the method:

public void readPanelnumber(panelnumber pn) {}

Yes, that makes me think what are these actionlisteners etc anyway...
Probably they are just a bunch for declared variables that are
set by a clock pulse at a background threat, right?

**jim829** · 05-26-2013, 05:19 PM

Does each panel have its own mouseListener? If so, then the only the mouseListener for that panel should be receiving events when the mouse is detected by that particular panel. And you already have the object (source of events). Perhaps I am still not quite certain what you want to do when the mouse is detected.

Regards,
Jim

**willemjav** · 05-26-2013, 05:59 PM

No jim just on listener that I am adding to:
for (int i = 0; i < 366; i++)
paneldatref[i].getPanelRef().addMouseListener(Mhandler);
check eg an info string at each day-panel when clicked!

**jim829** · 05-26-2013, 06:47 PM

It's a given that you can determine which panel you are in when you click the mouse. What I don't understand is why you want to pass all the references and not just the reference of the clicked panel?

Regards,
Jim

**willemjav** · 05-26-2013, 09:41 PM

The panel is a calendar of the academic your of which each day is like a button,
and I need to reed out the clicks from within an other class.

Java Code:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package studyrooms;

/**
 *
 * @author willem
 */


/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */



import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Calendar;
import java.util.Locale;
import javax.swing.*;
import javax.swing.border.Border;

/**
 *
 * 
 */
class CalendarPanel extends JFrame {

    private Font theFont, smallFont;
    private Color bluecolor, blackcolor;
    private Calendar cal, calprint;
    private MouseHandler Mhandler;
            PanelData paneldata[];
    private String monthlabel[], days[];
    private int monthCons[];
    private int daycount, thisyear, maxvacationfields;



    CalendarPanel()  {
        cal = Calendar.getInstance(Locale.GERMANY);
        calprint = Calendar.getInstance(Locale.GERMANY);
        setBounds(30, 30, 1700, 900);
        setTitle("Calendar Window");

        bluecolor = Color.BLUE;
        blackcolor = Color.BLACK;
        theFont = new Font("SansSerif", Font.PLAIN, 14);
        smallFont = new Font("SansSerif", Font.PLAIN, 11);

        monthlabel = new String[] {"SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER",
        "JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY", "AUGUST"};

        days = new String[]  {"lunes", "martes", "mi√©rcoles", "jueves",
            "viernes", "s√°bado", "domingo"};

        monthCons = new int[] {Calendar.SEPTEMBER, Calendar.OCTOBER,
        Calendar.NOVEMBER, Calendar.DECEMBER, Calendar.JANUARY,
        Calendar.FEBRUARY, Calendar.MARCH, Calendar.APRIL,
        Calendar.MAY, Calendar.JUNE, Calendar.JULY,
        Calendar.AUGUST};

        Mhandler = new MouseHandler(); // mousehandler for the panels

        paneldata = new PanelData[370]; // initialize day panel data array
            for (int i = 0; i < paneldata.length; i++) {
                    paneldata[i] = new PanelData();
            }


        daycount = 0; // this counts the days of the year for the panels
        // set the actual year as acedemic year year or year-1
        thisyear = cal.get(Calendar.YEAR);
        thisyear = thisyear-1;
        Container contentPane = getContentPane();
        contentPane.add(setupYearCalenderPanel(thisyear));

     //   System.out.println(" first year day (sunday=1) " + resetFirstLastDay(thisyear, 0));
     //   int maxday = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
     //   int firstday = cal.getActualMinimum(Calendar.DAY_OF_MONTH);
     //   System.out.println(" max day of that month " + maxday);
     //   System.out.println(" first day of that month " + firstday);
    }

    public static void main(String[] args) {
        CalendarPanel frame = new CalendarPanel();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public int ThisYear() {
        return thisyear;
    }

     public PanelData[] Panelref() {
        return paneldata;
    }

    public JPanel setupYearCalenderPanel(int year)  {
            // the 12 month of the year
            JPanel yearPanel = new JPanel(new GridLayout(3,4,2,2));
            yearPanel.setBackground(Color.WHITE);
            for (int i = 0; i < 12; i++) { // set the month cicle
                if (i == 4) year = year +1; // shift for the acedemic year
                yearPanel.add(setupSingleCalenderPanel(resetFirstLastDay(year, i), year, i));
            }

            return yearPanel;
    }

    public int resetFirstLastDay(int year, int month){ // month 0-11
        // the acedemic year runs from sept to sept
        // one year shift for the leap-year of the month feb
        year=year-1;

        calprint.set(year, monthCons[month], 1);
        int weekday = calprint.get(Calendar.DAY_OF_WEEK);
        int maxday = calprint.getActualMaximum(Calendar.DAY_OF_MONTH);

       // scaling for the calendar graph
        weekday = weekday + 5;
        if (weekday > 6) weekday = weekday - 7;
       // System.out.println(" year >" + year + " month number >" + month +
       //         " day of the week sunday=1 >" + weekday);
       // System.out.println("the mont " + month + " daynumber " + weekday +
       //         " last day of the month " + maxday);
        return weekday; // the first day of the month 0 = monday until 6


    }

    


    public JPanel setupSingleCalenderPanel(int day, int year, int month)  {
        // for layout it is important that all of the grids get filled
        JPanel mainPanel = new JPanel(new BorderLayout());
        mainPanel.setBackground(Color.WHITE);
        JPanel monthPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
        monthPanel.setBackground(Color.WHITE);


        // first row, set the text of that particular month
        JLabel monthLabel = new JLabel(year + "/ " + monthlabel[month]);
        monthPanel.add(monthLabel);
        JPanel daysPanel = new JPanel(new GridLayout(7, 7, 1, 1));
        daysPanel.setBackground(Color.WHITE);
        JPanel dPanel;
        JLabel dayLabel;
            // sets the second row that contains the week days
        for (int i = 0; i < 7; i++) {

            dPanel = new JPanel(new GridLayout(1, 1));
            dPanel.setBackground(Color.WHITE);
         //   dPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
            dayLabel = new JLabel("", SwingConstants.CENTER);
            dayLabel.setBackground(Color.WHITE);
            dayLabel.setFont(smallFont);
          //  dayLabel.setVerticalTextPosition(JLabel.BOTTOM);
            dayLabel.setVerticalAlignment(SwingConstants.BOTTOM);
            dayLabel.setText("" + days[i]);


            dPanel.add(dayLabel);
            daysPanel.add(dPanel);
        }

            // the first empty month day panels
        for (int i = 0; i < day; i++) {
            dPanel = new JPanel();
            dPanel.setBackground(Color.WHITE);
            daysPanel.add(dPanel);
        }
            // set the actual month for getting the max day of that month
            // calculate the day panels and the rest panels to the fill the month
            // month 0-11, days 1-31 days of the week 1-7 sunday is 1
        resetFirstLastDay(year, month); // this sets a particular date
        // this gives the max days of that particular month
        int maxday = calprint.getActualMaximum(Calendar.DAY_OF_MONTH);
        int restday = 31 - maxday;

            // setup the actual daypanels of the month
        for (int i = 0; i < maxday; i++) {
            dPanel = new JPanel();

            dPanel.setBackground(Color.WHITE);
            daysPanel.add(dPanel);
            JLabel dateLabel = new JLabel("" + (i+1));
            dPanel.add(dateLabel);
            dPanel.addMouseListener(Mhandler);
            paneldata[daycount].setPanelRef(dPanel);
            paneldata[daycount].setDateString(monthlabel[month]
                                                    + "/ " + (i+1));
            daycount++;
            Border etched = BorderFactory.createEtchedBorder(blackcolor,
                                                blackcolor);
            dPanel.setBorder(etched);
        }

        for (int i = 0; i < 11-day+restday; i++) {
            dPanel = new JPanel();
            dPanel.setBackground(Color.WHITE);
            daysPanel.add(dPanel);

        }

        mainPanel.add(monthPanel, BorderLayout.NORTH);
        mainPanel.add(daysPanel, BorderLayout.CENTER);
        Border etched = BorderFactory.createEtchedBorder(blackcolor,
                                                blackcolor);
        mainPanel.setBorder(etched);

        return mainPanel;
    }


   

    class PanelData { // the year array for each day
        private boolean dayset;
        private JPanel panelreference;
        private String datestring;

        public void setDayAvailable(boolean dt)  {
                dayset = dt;
            }
        public boolean getDayAvailable()  {
                return dayset;
            }

        public void setDateString(String st)  {
                datestring = st;
            }
        public String getDateString()  {
                return datestring;
            }

        public void setPanelRef(JPanel pr)  {
                panelreference = pr;
            }
        public JPanel getPanelRef()  {
                return panelreference;
            }

    }

     public int CalcDaynumber(int year, int month)  {
         int maxday = 0;
         year = year + 1; // concerning the leap year
         month = month + 4; // shift for the acedemic year sept-sept
         if (month >= 11) month = month - 11;
         for (int i = 0; i < month; i++) {
            resetFirstLastDay(year, i); // this sets a particular date
            // this gives the max days of that particular month
            int x = calprint.getActualMaximum(Calendar.DAY_OF_MONTH);
            maxday = maxday + x;

         } System.out.println(" month " + month + " days " + maxday);

         return maxday;
     }


    public class MouseHandler implements MouseListener {

        public void mousePressed(MouseEvent e) {
        }

        public void mouseReleased(MouseEvent e) {
        }

        public void mouseEntered(MouseEvent e) {
        }

        public void mouseExited(MouseEvent e) {
        }

        public void mouseClicked(MouseEvent e) {
            int indx = 0;
            if (e.getClickCount() >= 2) {
                // roominfopanrl array
                for (int i = 0; i < paneldata.length; i++) {
                   if (paneldata[i].getDayAvailable()) {
                      indx = i;

                   }
                   else {
                      indx = i;
                   }

                   if (e.getSource() == paneldata[i].getPanelRef()) {
                            System.out.println(paneldata[i].getDateString() +
                                   " day number " + i);
                   }
                }
                System.out.println(paneldata[indx].getDateString());
            }
        }

   }



}

**willemjav** · 05-26-2013, 09:42 PM

pull it through the compiler and watch the monitor
if you know a way how to pass the ref of the clicked panel
(in real time when it is clicked so to speak), tell me.

**jim829** · 05-26-2013, 11:23 PM

Here you go. All the panels are using the same mouseListener. The source of the event is the panel you want.

Java Code:

private class MyMouseListener extends MouseAdapter {
    public void mouseClicked(MouseEvent me) {
         MyPanel panel = (MyPanel) me.getSource();
         /**
           Now you can do what you want with panel
         */
    }
}

Regards,
Jim

**willemjav** · 05-26-2013, 11:35 PM

That looks interesting and brings my java-understanding on a different level
thanks jim
ps I´ll print out panel first

**jim829** · 05-26-2013, 11:39 PM

Here is a quick program I wrote to demonstrate what I believe you want.

Java Code:

public class PanelReferenceTest {

   JFrame frame;

   public PanelReferenceTest() {
      frame = new JFrame("Panel Reference Test");
      frame.setLayout(new FlowLayout());
      MyMouseListener ml = new MyMouseListener();
      for (int j = 1; j < 10; j++) {
         MyPanel mp = new MyPanel("P" + j);
         mp.addMouseListener(ml);
         frame.add(mp);
      }
      frame.setPreferredSize(new Dimension(300,300));
      frame.pack();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);

   }

   public static void main(String[] args) {
      // TODO Auto-generated method stub
      new PanelReferenceTest();
   }

   private class MyMouseListener extends MouseAdapter {
      public void mouseClicked(MouseEvent me) {
         MyPanel panel = (MyPanel) me.getSource();
         System.out.println("Panel " + panel.name + " clicked");
      }
   }

 
   
   private class MyPanel extends JPanel {
      String name;

      MyPanel(String name) {
         this.name = name;
         setBorder(new LineBorder(Color.blue, 2));
         setPreferredSize(new Dimension(50, 50));
      }

      public void paintComponent(Graphics g) {
         super.paintComponent(g); // added
         g.drawString(name, 25, 25);
      }
   }
}

Edit: In my haste I forgot to invoke super.paintComponent() method.

Regards,
Jim