Hi all, I am having an issue with getting my Jbuttons and JComboBox alignment properly in the JPanel. I have tried changing the coordinates of the GridLayout around to try to satisfy, but they are working properly. I am trying to get my radio buttons to the far right and my combobox and button at the bottom. (See example photo)
Below is my code
DrawingPane.java
package u09.u09.homework.start0;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JComboBox;
//import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
@SuppressWarnings("serial") // we do not need serialization
public class DrawingPane extends JPanel implements MouseMotionListener, ItemListener {
private int stateID; // memorizes the state of this JPanel
private Point[] points; // xy-points entered while the mouse is dragged
private int count; // number of points memorized
private int radius; // circle radius for drawing points
private JButton fancyJButton;
private JComboBox<String> imagesJComboBox;
//private JLabel label;
private static final String[] names = { "Thin", "Thick" };
//private Color[] colors = {Color.RED, Color.BLUE, Color.GREEN};
private JRadioButton redButton, blueButton, greenButton;
// constructor
public DrawingPane() {
imagesJComboBox = new JComboBox<String>( names ); // set up JComboBox
imagesJComboBox.addItemListener( this );
this.add( imagesJComboBox, BorderLayout.SOUTH ); // add combobox to JFrame
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(1,15, 10, 10));
fancyJButton = new JButton( "Reset" );
buttonPanel.add( fancyJButton ); // add fancyJButton to JFrame
this.add(buttonPanel, BorderLayout.SOUTH);
ButtonHandler handler = new ButtonHandler();
fancyJButton.addActionListener( handler );
// Create the radio buttons.
redButton = new JRadioButton("Red");
redButton.setSelected( true) ;
greenButton = new JRadioButton("Green");
blueButton = new JRadioButton("Blue");
// Group the radio buttons together
ButtonGroup group1 = new ButtonGroup();
group1.add( redButton );
group1.add( greenButton );
group1.add( blueButton );
// get these buttons receiving events
redButton.addItemListener( this );
greenButton.addItemListener( this );
blueButton.addItemListener( this );
this.setBackground(Color.WHITE);
stateID = 0;
points = new Point[10000];
count = 0;
radius = 3;
// tell JVM that this object wants to receive mouse motion events
addMouseMotionListener(this);
// create a wrapper panel
JPanel buttonPanel2 = new JPanel();
buttonPanel2.setLayout(new GridLayout(7,450, 12, 71));
// place all three on this panel
buttonPanel2.add(redButton);
buttonPanel2.add(greenButton);
buttonPanel2.add(blueButton);
// add the wrapper panel to this frame
this.add(buttonPanel2, BorderLayout.EAST);
}
private class ButtonHandler implements ActionListener {
public void actionPerformed( ActionEvent event )
{
if (event.getSource().equals(fancyJButton))
stateID = 0;
points = new Point[10000];
count = 0;
radius = 3;
repaint();
System.out.println("The panel state was reset");
}
}
public void paintComponent(Graphics g) {
super.paintComponent(g); // clear the panel
if (stateID == 0) {
// display the welcome message (until the state changes)
g.drawString("This is a blank DrawingPane", 20, 20);
g.drawString("Drag the mouse to draw something", 20, 35);
}
// draw all available points, if any
for (int i=0; i<count; i++) {
g.fillOval(points[i].x - radius, points[i].y - radius, 2*radius, 2*radius); //changed to fillOval
}
}
////////// methods required by interface MouseMotionListener /////////////
@Override
/**
* this method is invoked as the mouse cursor is being dragged
* with the left button pressed; the mouse event is generated at some
* predetermined time intervals; xy-coordinates of each event are
* placed in the array; no array overflow protection is implemented though
*/
public void mouseDragged(MouseEvent event) {
// this printout is used in test cases
System.out.println("Mouse dragged count = " + count +
" x = " + event.getX() + " y = " + event.getY());
// memorize mouse cursor position
points[count] = new Point(event.getX(), event.getY());
count++;
stateID = 1; // this changes the state
repaint(); // this invokes method paintComponent
}
@Override
public void mouseMoved(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public void itemStateChanged(ItemEvent evt) {
if(evt.getSource().equals(redButton))
setForeground(Color.RED);
if(evt.getSource().equals(greenButton))
setForeground(Color.green);
if(evt.getSource().equals(blueButton))
setForeground(Color.blue);
}
/* public void itemStateChanged2( ItemEvent event )
{
// determine whether item selected
if ( event.getStateChange() == ItemEvent.SELECTED )
{
// determine which of the two comboboxes was activated
Object source = event.getSource();
if ( source.equals( imagesJComboBox ) )
{
label.setIcon( colors[
imagesJComboBox.getSelectedIndex() ] );
}
else
{
// this should be never executed
// System.out.println( "Unknown source" + event.getSource() );
}
}*/
}
GUI_Main.java
package u09.u09.homework.start0;
import java.awt.BorderLayout;
import javax.swing.JFrame;
@SuppressWarnings("serial") // we do not need serialization
public class GUI_Main extends JFrame {
// starter method
public static void main(String[] s) {
GUI_Main app = new GUI_Main();
app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
app.setSize(450, 350);
app.setTitle("U03 Quick Start");
app.setLocation(400, 300);
app.setVisible(true);
}
// constructor
public GUI_Main() {
// declared as final to allow access from anonymous inner class
final DrawingPane pane = new DrawingPane();
this.add(pane, BorderLayout.CENTER);
}
}
