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Showing posts with label JScrollBar. Show all posts
Showing posts with label JScrollBar. Show all posts

2017/07/31

aterai

Detects that it has reached the bottom of JScrollPane

Code

JScrollPane scroll = new JScrollPane(c);
scroll.getVerticalScrollBar().getModel().addChangeListener(e -> {
  BoundedRangeModel m = (BoundedRangeModel) e.getSource();
  int extent  = m.getExtent();
  int maximum = m.getMaximum();
  int value   = m.getValue();
  if (value + extent >= maximum) {
    check.setEnabled(true);
  }
});

References

2015/04/28

aterai

ScrollBar for JTextField

Code

scroller.setModel(textField.getHorizontalVisibility());
//...
class EmptyThumbHandler extends ComponentAdapter implements DocumentListener {
  private final BoundedRangeModel emptyThumbModel
    = new DefaultBoundedRangeModel(0, 1, 0, 1);
  private final JTextField textField;
  private final JScrollBar scroller;
  public EmptyThumbHandler(JTextField textField, JScrollBar scroller) {
    super();
    this.textField = textField;
    this.scroller = scroller;
  }
  private void changeThumbModel() {
    EventQueue.invokeLater(new Runnable() {
      @Override public void run() {
        BoundedRangeModel m = textField.getHorizontalVisibility();
        int iv = m.getMaximum() - m.getMinimum() - m.getExtent() - 1; //-1:bug?
        if (iv <= 0) {
          scroller.setModel(emptyThumbModel);
        } else {
          scroller.setModel(textField.getHorizontalVisibility());
        }
      }
    });
  }
  @Override public void componentResized(ComponentEvent e) {
    changeThumbModel();
  }
  @Override public void insertUpdate(DocumentEvent e) {
    changeThumbModel();
  }
  @Override public void removeUpdate(DocumentEvent e) {
    changeThumbModel();
  }
  @Override public void changedUpdate(DocumentEvent e) {
    changeThumbModel();
  }
}

References

2015/03/30

aterai

Create a translucent JScrollBar

Code

public JComponent makeTranslucentScrollBar(JComponent c) {
  JScrollPane scrollPane = new JScrollPane(c) {
    @Override public boolean isOptimizedDrawingEnabled() {
      return false; // JScrollBar is overlap
    }
  };
  scrollPane.setVerticalScrollBarPolicy(
      ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
  scrollPane.setHorizontalScrollBarPolicy(
      ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

  scrollPane.setComponentZOrder(scrollPane.getVerticalScrollBar(), 0);
  scrollPane.setComponentZOrder(scrollPane.getViewport(), 1);
  scrollPane.getVerticalScrollBar().setOpaque(false);

  scrollPane.setLayout(new ScrollPaneLayout() {
    @Override public void layoutContainer(Container parent) {
      JScrollPane scrollPane = (JScrollPane) parent;

      Rectangle availR = scrollPane.getBounds();
      availR.x = availR.y = 0;

      Insets insets = parent.getInsets();
      availR.x = insets.left;
      availR.y = insets.top;
      availR.width  -= insets.left + insets.right;
      availR.height -= insets.top  + insets.bottom;

      Rectangle vsbR = new Rectangle();
      vsbR.width  = 12;
      vsbR.height = availR.height;
      vsbR.x = availR.x + availR.width - vsbR.width;
      vsbR.y = availR.y;

      if (viewport != null) {
        viewport.setBounds(availR);
      }
      if (vsb != null) {
        vsb.setVisible(true);
        vsb.setBounds(vsbR);
      }
    }
  });
  scrollPane.getVerticalScrollBar().setUI(new BasicScrollBarUI() {
    private final Color defaultColor  = new Color(220, 100, 100, 100);
    private final Color draggingColor = new Color(200, 100, 100, 100);
    private final Color rolloverColor = new Color(255, 120, 100, 100);
    private final Dimension d = new Dimension();
    @Override protected JButton createDecreaseButton(int orientation) {
      return new JButton() {
        @Override public Dimension getPreferredSize() {
          return d;
        }
      };
    }
    @Override protected JButton createIncreaseButton(int orientation) {
      return new JButton() {
        @Override public Dimension getPreferredSize() {
          return d;
        }
      };
    }
    @Override protected void paintTrack(Graphics g, JComponent c, Rectangle r) {}
    @Override protected void paintThumb(Graphics g, JComponent c, Rectangle r) {
      Color color;
      JScrollBar sb = (JScrollBar) c;
      if (!sb.isEnabled() || r.width > r.height) {
        return;
      } else if (isDragging) {
        color = draggingColor;
      } else if (isThumbRollover()) {
        color = rolloverColor;
      } else {
        color = defaultColor;
      }
      Graphics2D g2 = (Graphics2D) g.create();
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                          RenderingHints.VALUE_ANTIALIAS_ON);
      g2.setPaint(color);
      g2.fillRect(r.x, r.y, r.width - 1, r.height - 1);
      g2.setPaint(Color.WHITE);
      g2.drawRect(r.x, r.y, r.width - 1, r.height - 1);
      g2.dispose();
    }
    @Override protected void setThumbBounds(int x, int y, int width, int height) {
      super.setThumbBounds(x, y, width, height);
      //scrollbar.repaint(x, 0, width, scrollbar.getHeight());
      scrollbar.repaint();
    }
  });
  return scrollPane;
}

References

2013/01/28

aterai

JScrollBar search highlighter

Code

Override WindowsScrollBarUI#paintTrack(...)

scrollbar.setUI(new WindowsScrollBarUI() {
  @Override protected void paintTrack(
      Graphics g, JComponent c, Rectangle trackBounds) {
    super.paintTrack(g, c, trackBounds);

    Rectangle rect = textArea.getBounds();
    double sy = trackBounds.getHeight() / rect.getHeight();
    AffineTransform at = AffineTransform.getScaleInstance(1.0, sy);
    Highlighter highlighter = textArea.getHighlighter();
    g.setColor(Color.YELLOW);
    try{
      for(Highlighter.Highlight hh: highlighter.getHighlights()) {
        Rectangle r = textArea.modelToView(hh.getStartOffset());
        Rectangle s = at.createTransformedShape(r).getBounds();
        int h = 2; //Math.max(2, s.height-2);
        g.fillRect(trackBounds.x, trackBounds.y+s.y, trackBounds.width, h);
      }
    }catch(BadLocationException e) {
      e.printStackTrace();
    }
  }
});

JLabel + Icon + RowHeader

final JScrollPane scroll = new JScrollPane(textArea);
JLabel label = new JLabel(new Icon() {
  private final Color THUMB_COLOR = new Color(0,0,255,50);
  private final Rectangle thumbRect = new Rectangle();
  private final JTextComponent textArea;
  private final JScrollBar scrollbar;
  public HighlightIcon(JTextComponent textArea, JScrollBar scrollbar) {
    this.textArea  = textArea;
    this.scrollbar = scrollbar;
  }
  @Override public void paintIcon(Component c, Graphics g, int x, int y) {
    //Rectangle rect   = textArea.getBounds();
    //Dimension sbSize = scrollbar.getSize();
    //Insets sbInsets  = scrollbar.getInsets();
    //double sy = (sbSize.height-sbInsets.top-sbInsets.bottom)/rect.getHeight();
    int itop = scrollbar.getInsets().top;
    BoundedRangeModel range = scrollbar.getModel();
    double sy = range.getExtent()/(double)(range.getMaximum()-range.getMinimum());
    AffineTransform at = AffineTransform.getScaleInstance(1.0, sy);
    Highlighter highlighter = textArea.getHighlighter();

    //paint Highlight
    g.setColor(Color.RED);
    try{
      for(Highlighter.Highlight hh: highlighter.getHighlights()) {
        Rectangle r = textArea.modelToView(hh.getStartOffset());
        Rectangle s = at.createTransformedShape(r).getBounds();
        int h = 2; //Math.max(2, s.height-2);
        g.fillRect(x, y+itop+s.y, getIconWidth(), h);
      }
    }catch(BadLocationException e) {
      e.printStackTrace();
    }

    //paint Thumb
    if(scrollbar.isVisible()) {
      //JViewport vport = Objects.requireNonNull(
      //  (JViewport)SwingUtilities.getAncestorOfClass(JViewport.class, textArea));
      //Rectangle thumbRect = vport.getBounds();
      thumbRect.height = range.getExtent();
      thumbRect.y = range.getValue(); //vport.getViewPosition().y;
      g.setColor(THUMB_COLOR);
      Rectangle s = at.createTransformedShape(thumbRect).getBounds();
      g.fillRect(x, y+itop+s.y, getIconWidth(), s.height);
    }
  }
  @Override public int getIconWidth() {
    return 8;
  }
  @Override public int getIconHeight() {
    JViewport vport = Objects.requireNonNull(
        (JViewport)SwingUtilities.getAncestorOfClass(JViewport.class, textArea));
    return vport.getHeight();
  }
});

scroll.setVerticalScrollBar(scrollbar);
/*
// Fixed Versions: 7 (b134)
scroll.setRowHeaderView(label);
/*/
// [JDK-6826074] JScrollPane does not revalidate the component hierarchy after scrolling - Java Bug System
// https://bugs.openjdk.java.net/browse/JDK-6826074
// Affected Versions: 6u12,6u16,7
JViewport vp = new JViewport() {
  @Override public void setViewPosition(Point p) {
    super.setViewPosition(p);
    revalidate();
  }
};
vp.setView(label);
scroll.setRowHeader(vp);

MatteBorder + Icon + RowHeader

JScrollBar scrollBar = new JScrollBar(JScrollBar.VERTICAL) {
  @Override public Dimension getPreferredSize() {
    Dimension d = super.getPreferredSize();
    d.width += getInsets().left;
    return d;
  }
  @Override public void updateUI() {
    super.updateUI();
    setBorder(BorderFactory.createMatteBorder(0, 4, 0, 0, new Icon() {
      @Override public void paintIcon(Component c, Graphics g, int x, int y) {
        //...
      }
      @Override public int getIconWidth() {
        return getInsets().left;
      }
      @Override public int getIconHeight() {
        return getHeight();
      }
    }));
  }
};
scroll.setVerticalScrollBar(scrollBar);

References

2009/02/26

aterai

Use JScrollBar as JSlider

Code

int step   = 5;
int extent = 20;
int min    = 0;
int max    = extent*10; //200
int value  = 50;
final JScrollBar scrollbar = new JScrollBar(
            JScrollBar.HORIZONTAL, value, extent, min, max+extent);
scrollbar.setUnitIncrement(step);
scrollbar.getModel().addChangeListener(new ChangeListener(){
  public void stateChanged(javax.swing.event.ChangeEvent e) {
    BoundedRangeModel m = (BoundedRangeModel)e.getSource();
    spinner.setValue(m.getValue());
  }
});
final JSpinner spinner = new JSpinner(
            new SpinnerNumberModel(value, min, max, step));
//...

References