How to use

getBackground

method

in

java.awt.Container

@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
  Graphics2D g2d = (Graphics2D) g;
  g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  RoundRectangle2D.Double rectangle = new RoundRectangle2D.Double(x, y, width - 1, height - 1, radius, radius);
  Area rectangleArea = new Area(rectangle);
  Area area = new Area(new Rectangle(0, 0, width, height));
  area.subtract(rectangleArea);
  g2d.setClip(area);
  g2d.setColor(c.getParent().getBackground());
  g2d.fillRect(0, 0, width, height);
  g2d.setClip(null);
  if (color == null) {
    g2d.setColor(c.getBackground());
  } else {
    g2d.setColor(color);
  }
  g2d.setStroke(stroke);
  g2d.draw(rectangleArea);
}

Container parent = c.getParent();
if (parent!=null) {
  g2.setColor(parent.getBackground());
  Area corner = new Area(new Rectangle2D.Float(x, y, width, height));
  corner.subtract(new Area(round));

...
 Container container = getContentPane();
 container.setBackground(new Color(240,240,240));
 ...
 nonEditableTextField.setBackground(container.getBackground());
 ...

@Override
public Color getBackground() {
 return root.getContentPane().getBackground();
}

/**
 * Paints this effect.
 * @param g canvas
 */
public void paint(Graphics g) {
  Graphics2D g2 = (Graphics2D) g;
  g2.setBackground(target.getParent().getBackground());
  g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1.0f));
  g.drawImage(shadow.render(target.getWidth(), target.getHeight(), borderRadius, level.getValue(), MaterialShadow.Type.SQUARE), 0, 0, null);
}

  @Override
  public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
      int row, int column) {
    final Component c = delegate.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
    final Container mapView = SwingUtilities.getAncestorOfClass(MapView.class, table);
    if(mapView != null)
      c.setBackground(mapView.getBackground());
    final int height = (int) (((AttributeTable)table).getZoom() * 6);
    final Dimension preferredSize = new Dimension(1, height);
    c.setPreferredSize(preferredSize);
    return c;
  }
}

/**
 * Overriden to paint the background of the component but keeping the rounded
 * corners.
 */
@Override
public void update(Graphics g, JComponent c) {
 if (c.isOpaque()) {
  g.setColor(c.getParent().getBackground());
  g.fillRect(0, 0, c.getWidth(), c.getHeight());
  g.setColor(c.getBackground());
  g.fillRect(0, getRoundHeight(), c.getWidth(), c.getHeight() - getRoundHeight());
 }
 paint(g, c);
}

/**
 * Overriden to paint the background of the component but keeping the rounded
 * corners.
 */
public void update(Graphics g, JComponent c) {
 if (c.isOpaque()) {
  g.setColor(c.getParent().getBackground());
  g.fillRect(0, 0, c.getWidth(), c.getHeight());
  g.setColor(c.getBackground());
  g.fillRect(0, getRoundHeight(), c.getWidth(), c.getHeight() - getRoundHeight());
 }
 paint(g, c);
}

/**
 * Overriden to paint the background of the component but keeping the rounded
 * corners.
 */
public void update(Graphics g, JComponent c) {
 if (c.isOpaque()) {
  g.setColor(c.getParent().getBackground());
  g.fillRect(0, 0, c.getWidth(), c.getHeight());
  g.setColor(c.getBackground());
  g.fillRect(0, getRoundHeight(), c.getWidth(), c.getHeight() - getRoundHeight());
 }
 paint(g, c);
}

public void mouseExited( MouseEvent e )
{
 setBackground( _bkColor != null ? _bkColor : getParent().getBackground() );
}

/**
 * Overriden to paint the background of the component but keeping the rounded
 * corners.
 */
@Override
public void update(Graphics g, JComponent c) {
 if (c.isOpaque()) {
  g.setColor(c.getParent().getBackground());
  g.fillRect(0, 0, c.getWidth(), c.getHeight());
  g.setColor(c.getBackground());
  g.fillRect(0, getRoundHeight(), c.getWidth(), c.getHeight() - getRoundHeight());
 }
 paint(g, c);
}

/** Creates new form ResourceImageEditor */
public ResourceImageEditor() {
  initComponents();
  this.getAccessibleContext().setAccessibleName(NbBundle.getMessage(ResourceImageEditor.class, "ResourceImageEditor.accessible.name"));
  this.getAccessibleContext().setAccessibleDescription(NbBundle.getMessage(ResourceImageEditor.class, "ResourceImageEditor.accessible.description"));
  
  this.textFieldImage.setBackground(this.textFieldImage.getParent().getBackground());
  this.textFieldNumTiles.setBackground(this.textFieldNumTiles.getParent().getBackground());
  this.textFieldSize.setBackground(this.textFieldSize.getParent().getBackground());
  this.resourceComponent = new ResourceImageList();
  this.panelResourceList.add(new JScrollPane(this.resourceComponent));
}

@Override
public void addNotify()
{
 super.addNotify();
 setBackground( getParent().getBackground() );
}

@Override
public void addNotify()
{
 super.addNotify();
 setBackground( getParent().getBackground() );
}

@Override
public void addNotify()
{
 super.addNotify();
 setBackground( getParent().getBackground() );
}

/**
 * If mouse leaves the transferable set its parent color mode to inactive,
 * i.e., display it with the color as defined by
 * <code>setInactiveColor()</code>
 *
 * @param mouseEvent the mouse event
 */
@Override
public void mouseExited(MouseEvent mouseEvent) {
  Connector i = (Connector) getParent();
  i.setBackground(this.getParent().getParent().getBackground());
  i.setSelected(false);
}

public void mouseExited( MouseEvent e )
{
 setBorderPainted( isBorderConstant() );
 setBackground( _bkColor != null ? _bkColor : getParent().getBackground() );
}

protected void drawSingleLine(Graphics _g, String _s, int _x, int _y, int _w)
{
 Color bg=getBackground();
 if(!isOpaque())
 {
  Container p=getParent();
  if(p!=null) bg=p.getBackground();
 }
 BuFontChooser.drawStringWithStyle
  (_g,_s,_x,_y,style_|(isUnderlined() ? BuFontChooser.UNDERLINED : 0),bg);
 //_g.drawString(_s,_x,_y);
 //if(isUnderlined()) _g.drawLine(_x,_y+2,_x+_w-1,_y+2);
}

@Override
public Color getBackground() {
  return getStyleable().getParent() != null ? getStyleable().getParent().getBackground()
      : getStyleable().getNoneStyle().getBackground();
}

public Color getBackground() {
 return getStyleable().getParent() != null ? getStyleable().getParent().getBackground() :
  getStyleable().getNoneStyle().getBackground();
}