📦 0372hoanghoccode / ko-co

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65package GUI;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JScrollBar;
import javax.swing.plaf.basic.BasicScrollBarUI;



public class myDesignScrollBar extends BasicScrollBarUI{
	private static final int SCROLL_BAR_ALPHA_ROLLOVER = 100;
    private static final int SCROLL_BAR_ALPHA = 50;
    private static final int THUMB_SIZE = 10;
    private static final Color THUMB_COLOR = Color.BLACK;

    public myDesignScrollBar() {
    }
    @Override
    protected JButton createDecreaseButton(int orientation) {
        return new InvisibleScrollBarButton();
    }

    @Override
    protected JButton createIncreaseButton(int orientation) {
        return new InvisibleScrollBarButton();
    }

    @Override
    protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) {
    }

    @Override
    protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {
        int alpha = isThumbRollover() ? SCROLL_BAR_ALPHA_ROLLOVER : SCROLL_BAR_ALPHA;
        int orientation = scrollbar.getOrientation();
        int x = thumbBounds.x;
        int y = thumbBounds.y;
        int width = orientation == JScrollBar.VERTICAL ? THUMB_SIZE : thumbBounds.width;
        width = Math.max(width, THUMB_SIZE);

        int height = orientation == JScrollBar.VERTICAL ? thumbBounds.height : THUMB_SIZE;
        height = Math.max(height, THUMB_SIZE);
        
        Graphics2D g2 = (Graphics2D) g.create();
        g2.setColor(new Color(0,0,0,70));
        g2.fillRect(x, y, width, height);
        g2.dispose();
    }
    private static class InvisibleScrollBarButton extends JButton {
        private InvisibleScrollBarButton() {
            setOpaque(false);
            setFocusable(false);
            setFocusPainted(false);
            setBorderPainted(false);
            setBorder(BorderFactory.createEmptyBorder());
        }
    }
}