Swing Hintergrund aller Komponenten verändern

[Dragonfire]

Hi,
ich meine es gibt mal einen leichten Weg
die Hintergrundsfarbe aller Komponenten zur Laufzeit zu ändern.

Weiß wer einen eleganteren Weg,
als rekursiv alle Komponenten aufzurufen?

Mit dem UI-Manager geht es ja nur beim Start :-(

So sieht zurzeit mein Code aus:

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class BackgroundTest {
	public static JPanel getMainPanel() {
		final JPanel mainPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));

		JPanel panel1 = new JPanel();
		panel1.add(new JButton("A"));
		panel1.add(new JButton("B"));
		panel1.add(new JButton("C"));

		JPanel panel2 = new JPanel(new GridLayout(2, 1));
		panel2.add(new JButton("A"));
		panel2.add(new JButton("B"));
		panel2.add(new JButton("C"));

		JPanel panel3 = new JPanel();
		final JColorChooser c = new JColorChooser(Color.BLACK);
		c.getSelectionModel().addChangeListener(new ChangeListener() {

			@Override
			public void stateChanged(ChangeEvent e) {
				updateBackground(mainPanel, c.getColor());
			}
		});
		panel3.add(c);

		mainPanel.add(panel1);
		mainPanel.add(panel2);
		mainPanel.add(panel3);
		return mainPanel;
	}

	public static void updateBackground(Component component, Color backcolor) {
		component.setBackground(backcolor);

		if (component instanceof Container) {
			for (int i = 0; i < ((Container) component).getComponentCount(); i++) {
				updateBackground(((Container) component).getComponent(i),
						backcolor);
			}
		}
	}

	public static void main(String[] args) {
		UIManager.put("Panel.background", Color.WHITE);
		JFrame f = new JFrame("BackgroundTest");
		f.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

		f.add(getMainPanel());
		f.pack();
		f.setVisible(true);
		f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
	}
}

Hat wer einen anderen Lösungsansatz?

 

[Michael...]

Hat wer einen anderen Lösungsansatz?

Alle relevanten Komponenten transparent machen und dann muss man nur die Hintergrundfarbe des Containers ändern.

 

[Dragonfire]

Das ist schlau^^

Schade das

UIManager.put("Panel.background", null);

nicht geht,
dann mache ich das eben manuell^^

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class BackgroundTest {
	public static JPanel getMainPanel() {
		final JPanel mainPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));

		JPanel panel1 = new JPanel();
		panel1.setBackground(null);
		panel1.add(new JButton("A"));
		panel1.add(new JButton("B"));
		panel1.add(new JButton("C"));

		JPanel panel2 = new JPanel(new GridLayout(2, 1));
		panel2.setBackground(null);
		panel2.add(new JButton("A"));
		panel2.add(new JButton("B"));
		panel2.add(new JButton("C"));

		JPanel panel3 = new JPanel();
		panel3.setBackground(null);
		final JColorChooser c = new JColorChooser(Color.BLACK);
		updateBackground(c);
		c.getSelectionModel().addChangeListener(new ChangeListener() {

			@Override
			public void stateChanged(ChangeEvent e) {
				mainPanel.setBackground(c.getColor());
			}
		});
		panel3.add(c);

		mainPanel.add(panel1);
		mainPanel.add(panel2);
		mainPanel.add(panel3);
		return mainPanel;
	}

	public static void updateBackground(Component component) {
		component.setBackground(null);

		if (component instanceof Container) {
			for (int i = 0; i < ((Container) component).getComponentCount(); i++) {
				updateBackground(((Container) component).getComponent(i));
			}
		}
	}

	public static void main(String[] args) {
		JFrame f = new JFrame("BackgroundTest");
		f.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

		f.add(getMainPanel());
		f.pack();
		f.setVisible(true);
		f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
	}
}