Java Swing, GUI locks up when painting component
So I'm working on a crappy little 2d RPG in java to try to increase my knowledge. Ran into a problem with Swing. I've got a JFrame with 2 JScrollPanes, each JScrollPane has a custom JPanel attached for custom painting. Whenever the paint method gets called now, the GUI freezes. I've tried doing step by step debugging and still can't find the issue.
I'll try to keep the pasted code as little as possible. If anyone has any ideas, or needs me to post more of my classes in the project let me know!
// The JFrame and constructor //
public class EditMaps extends javax.swing.JFrame {
public static Board map;
private MapJPanel mapPanel;
private PalletteJPanel palletteJPanel;
public static int selectedPallette = -1;
public static int selectedTile = 0;
public EditMaps() throws IOException, ClassNotFoundException
{
initComponents();
this.setResizable(false);
this.setLayout(null);
map = new Board();
mapPanel = new MapJPanel();
mapPanel.setPreferredSize(new Dimension(1000, 1000));
mapPanel.setBorder(BorderFactory.createLineBorder( Color.red));
mapScrollPane.getViewport().add(mapPanel);
mapScrollPane.setViewportView(mapPanel);
palletteJPanel = new PalletteJPanel();
palletteScrollPanel.getViewport().add(palletteJPan el);
palletteScrollPanel.setViewportView(palletteJPanel );
tileSetDropDown.addItem("Choose Tileset");
for (String item : MapTool.getTileSetNames())
{
tileSetDropDown.addItem(item);
}
}
//Method that causes freezing due to calling the revalidate methods on the panels//
private void tileSetDropDownActionPerformed(java.awt.event.Acti onEvent evt) {
if (tileSetDropDown.getSelectedIndex() > 0)
{
try
{
map.setTileSet(MapTool.getTileSet(tileSetDropDown. getSelectedIndex() - 1));
int height = 35*(map.getTileSet().getTiles().size()/5)+10;
palletteJPanel.setPreferredSize(new Dimension(palletteScrollPanel.getWidth(), height));
palletteScrollPanel.setPreferredSize(new Dimension(palletteScrollPanel.getWidth(), height));
palletteScrollPanel.revalidate();
palletteJPanel.revalidate();
}
catch (IOException ex)
{
}
catch (ClassNotFoundException ex)
{
}
}
}
//The custom JPanel being updated in the previous method //
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package rpg.maps;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.ArrayList;
import javax.swing.JPanel;
/**
*
* @author 501282234
*/
public class PalletteJPanel extends JPanel
{
public PalletteJPanel()
{
setSize(220, 530);
setPreferredSize(new Dimension(220, 530));
}
@Override
public void paintComponent(Graphics g)
{
Graphics2D g2d = (Graphics2D) g;
super.paintComponent(g2d);
try
{
if (EditMaps.map.getTileSet().getTiles().get(0).getIm age() != null)
{
ArrayList<Tile> tiles = EditMaps.map.getTileSet().getTiles();
int y = 10;
int x = 16;
int count=0;
for (count = 0; count < tiles.size();)
{
if (count % 5 == 4)
{
y+=35;
x=16;
}
tiles.get(count).paint(x, y, 32, g2d);
x+=35;
}
for (Tile tile : tiles)
{
if (count % 5 == 4)
{
y+=35;
x=16;
}
tile.paint(x, y, 32, g2d);
x+=35;
count++;
}
}
if (EditMaps.selectedPallette > -1)
{
int x = (EditMaps.selectedPallette % 5);
int y = ((EditMaps.selectedPallette-x) / 5);
x = x*35+16;
y = y*35+10;
g2d.setColor(Color.red);
g2d.drawRect(x-1, y-1, 33, 33);
}
}
catch(NullPointerException ex)
{
System.out.println("Null pointer when scanning tiles");
}
}
}
