Java by API/javax.swing/JScrollPane

JScrollPane: getHorizontalScrollBar()

  
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.border.LineBorder;
public class MainClass {
  public static void main(String args[]) throws Exception {
    JFrame frame = new JFrame("Cornering Sample");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JButton button = new JButton("+");
    
    JLabel bigLabel = new JLabel("A");
    bigLabel.setPreferredSize(new Dimension(400,400));
    bigLabel.setBorder(new LineBorder(Color.red));
    
    JScrollPane scrollPane = new JScrollPane(bigLabel);
    scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, button);
    scrollPane.setColumnHeaderView(new JLabel("B"));
    scrollPane.setRowHeaderView(new JLabel("C"));
    ActionListener actionListener = new JScrollPaneToTopAction(scrollPane);
    button.addActionListener(actionListener);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

class JScrollPaneToTopAction implements ActionListener {
  JScrollPane scrollPane;
  public JScrollPaneToTopAction(JScrollPane scrollPane) {
    if (scrollPane == null) {
      throw new IllegalArgumentException("JScrollPaneToTopAction: null JScrollPane");
    }
    this.scrollPane = scrollPane;
  }
  public void actionPerformed(ActionEvent actionEvent) {
    JScrollBar verticalScrollBar   = scrollPane.getVerticalScrollBar();
    JScrollBar horizontalScrollBar = scrollPane.getHorizontalScrollBar();
    verticalScrollBar.setValue(verticalScrollBar.getMinimum());
    horizontalScrollBar.setValue(horizontalScrollBar.getMinimum());
  }
}

JScrollPane: getHorizontalScrollBarPolicy()

  
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Main {
  public static void main(String[] argv) throws Exception {
    JTextArea textArea = new JTextArea();
    JScrollPane pane = new JScrollPane(textArea);
    // Get the default scrollbar policy
    int hpolicy = pane.getHorizontalScrollBarPolicy();
    // JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED;
    int vpolicy = pane.getVerticalScrollBarPolicy();
    // JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED;
  }
}

JScrollPane: getVerticalScrollBar()

  
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.border.LineBorder;
public class MainClass {
  public static void main(String args[]) throws Exception {
    JFrame frame = new JFrame("Cornering Sample");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JButton button = new JButton("+");
    
    JLabel bigLabel = new JLabel("A");
    bigLabel.setPreferredSize(new Dimension(400,400));
    bigLabel.setBorder(new LineBorder(Color.red));
    
    JScrollPane scrollPane = new JScrollPane(bigLabel);
    scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, button);
    scrollPane.setColumnHeaderView(new JLabel("B"));
    scrollPane.setRowHeaderView(new JLabel("C"));
    ActionListener actionListener = new JScrollPaneToTopAction(scrollPane);
    button.addActionListener(actionListener);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

class JScrollPaneToTopAction implements ActionListener {
  JScrollPane scrollPane;
  public JScrollPaneToTopAction(JScrollPane scrollPane) {
    if (scrollPane == null) {
      throw new IllegalArgumentException("JScrollPaneToTopAction: null JScrollPane");
    }
    this.scrollPane = scrollPane;
  }
  public void actionPerformed(ActionEvent actionEvent) {
    JScrollBar verticalScrollBar   = scrollPane.getVerticalScrollBar();
    JScrollBar horizontalScrollBar = scrollPane.getHorizontalScrollBar();
    verticalScrollBar.setValue(verticalScrollBar.getMinimum());
    horizontalScrollBar.setValue(horizontalScrollBar.getMinimum());
  }
}

JScrollPane: getVerticalScrollBarPolicy()

  
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Main {
  public static void main(String[] argv) throws Exception {
    JTextArea textArea = new JTextArea();
    JScrollPane pane = new JScrollPane(textArea);
    // Get the default scrollbar policy
    int hpolicy = pane.getHorizontalScrollBarPolicy();
    // JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED;
    int vpolicy = pane.getVerticalScrollBarPolicy();
    // JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED;
  }
}

JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS

  

import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Main {
  public static void main(String[] argv) throws Exception {
    JTextArea textArea = new JTextArea();
    JScrollPane pane = new JScrollPane(textArea);
    pane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    pane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
  }
}

JScrollPane: setColumnHeaderView(Component view)

  
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
public class MainClass {
  public static void main(final String args[]) {
    String labels[] = { "A", "B", "C", "D", "E" };
    JFrame frame = new JFrame("Selection Modes");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JList list1 = new JList(labels);
    JScrollPane sp1 = new JScrollPane(list1);
    sp1.setColumnHeaderView(new JLabel("List"));
    frame.add(sp1, BorderLayout.CENTER);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

JScrollPane: setCorner(String key, Component corner)

  
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Cornering Sample");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Icon acrossLogo = new ImageIcon("logo-across.jpg");
    Icon downLogo = new ImageIcon("logo-down.jpg");
    Icon bookCover = new ImageIcon("puzzlebook.jpg");
    JLabel columnLabel = new JLabel(acrossLogo);
    JLabel rowLabel = new JLabel(downLogo);
    JLabel coverLabel = new JLabel(bookCover);
    JButton button = new JButton("+");
    button.setFont(new Font("Monospaced", Font.PLAIN, 8));
    JScrollPane scrollPane = new JScrollPane(coverLabel);
    scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, button);
    scrollPane.setColumnHeaderView(columnLabel);
    scrollPane.setRowHeaderView(rowLabel);
    ActionListener actionListener = new JScrollPaneToTopAction(scrollPane);
    button.addActionListener(actionListener);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}
class JScrollPaneToTopAction implements ActionListener {
  JScrollPane scrollPane;
  public JScrollPaneToTopAction(JScrollPane scrollPane) {
    if (scrollPane == null) {
      throw new IllegalArgumentException(
          "JScrollPaneToTopAction: null JScrollPane");
    }
    this.scrollPane = scrollPane;
  }
  public void actionPerformed(ActionEvent actionEvent) {
    JScrollBar verticalScrollBar = scrollPane.getVerticalScrollBar();
    JScrollBar horizontalScrollBar = scrollPane.getHorizontalScrollBar();
    verticalScrollBar.setValue(verticalScrollBar.getMinimum());
    horizontalScrollBar.setValue(horizontalScrollBar.getMinimum());
  }
}

JScrollPane: setRowHeaderView(Component com)

  
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JViewport;
public class MainClass {
  public static void main(final String args[]) {
    final Object rows[][] = { { "one", "1" }, { "two", "2" },
        { "three", "3" } };
    final Object headers[] = { "English", "Digit" };
    
    JFrame frame = new JFrame("Scrollless Table");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    JTable table = new JTable(rows,headers);
    
    JScrollPane scrollPane = new JScrollPane(table);
    JViewport viewport = new JViewport();
    viewport.setView(table);
    scrollPane.setColumnHeaderView( new JLabel("table header here"));
    scrollPane.setRowHeaderView(viewport);
    
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}

JScrollPane: setViewportView(Component view)

  
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
public class MainClass {
  public static void main(String args[]) throws Exception {
    JFrame frame = new JFrame("");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JLabel dogLabel = new JLabel("www.jexp.ru");
    JScrollPane scrollPane = new JScrollPane();
    scrollPane.setViewportView(dogLabel);
//    scrollPane.getViewport().setView(dogLabel);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

JScrollPane.VERTICAL_SCROLLBAR_ALWAYS

  

import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Main {
  public static void main(String[] argv) throws Exception {
    JTextArea textArea = new JTextArea();
    JScrollPane pane = new JScrollPane(textArea);
    pane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    pane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
  }
}

new JScrollPane(Component view, int vsbPolicy, int hsbPolicy)

  
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
public class MainClass extends JPanel {
  public MainClass() {
    setLayout(new BorderLayout());
    JPanel jp = new JPanel();
    jp.setLayout(new GridLayout(20, 20));
    int b = 0;
    for (int i = 0; i < 20; i++) {
      for (int j = 0; j < 20; j++) {
        jp.add(new JButton("Button " + b));
        ++b;
      }
    }
    // Add panel to a scroll pane.
    int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
    int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
    JScrollPane jsp = new JScrollPane(jp, v, h);
    // Add scroll pane to the content pane.
    add(jsp, BorderLayout.CENTER);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}