PanelButton.java

package magic.ui.widget;

import magic.ui.FontsAndBorders;
import javax.swing.JComponent;
import javax.swing.JPanel;
import javax.swing.OverlayLayout;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.SwingUtilities;

@SuppressWarnings("serial")
public abstract class PanelButton extends TexturedPanel {

    private final JPanel layeredPanel;
    private final JPanel overlayPanel;
    private boolean isValidChoice = false;

    public PanelButton() {
        setLayout(new BorderLayout());
        setBorder(FontsAndBorders.UP_BORDER);

        // create subpanel with overlay manager so color overlay and buttons overlap
        layeredPanel = new JPanel();
        layeredPanel.setOpaque(false);
        final OverlayLayout layout = new OverlayLayout(layeredPanel);
        layeredPanel.setLayout(layout);

        // color overlay
        overlayPanel = new JPanel();
        overlayPanel.setVisible(false);
        overlayPanel.setAlignmentX(0.5f); // align center middle
        overlayPanel.setAlignmentY(0.5f);
        layeredPanel.add(overlayPanel);

        addMouseListener(new MouseAdapter() {

            private boolean isLeftClick(MouseEvent e) {
                return SwingUtilities.isLeftMouseButton(e);
            }

            @Override
            public void mousePressed(final MouseEvent event) {
                if (isLeftClick(event) && isValidChoice) {
                    setBorder(FontsAndBorders.DOWN_BORDER);
                }
            }

            @Override
            public void mouseReleased(final MouseEvent event) {
                if (isLeftClick(event)) {
                    setBorder(FontsAndBorders.UP_BORDER);
                    if (PanelButton.this.contains(event.getX(),event.getY())) {
                        PanelButton.this.mouseClicked();
                    }
                }
            }

            @Override
            public void mouseEntered(final MouseEvent event) {
                PanelButton.this.mouseEntered();
            }

            @Override
            public void mouseExited(final MouseEvent event) {
                PanelButton.this.mouseExited();
            }
        });

        add(layeredPanel, BorderLayout.CENTER);
    }

    public void setValid(final boolean valid) {
        isValidChoice = valid;
        overlayPanel.setBackground(getValidColor());
        overlayPanel.setVisible(valid);
    }

    public void setValidNoOverlay(final boolean valid) {
        isValidChoice = valid;
    }

    public void setComponent(final JComponent component) {
        layeredPanel.add(component);
        component.setAlignmentX(0.5f); // align center middle
        component.setAlignmentY(0.5f);
    }

    public void mouseClicked() {}

    public void mouseEntered() {}

    public void mouseExited() {}

    public abstract Color getValidColor();
}