Java by API/javax.swing/ScrollPaneConstants

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ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED

   <source lang="java">

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);
 }

} 


 </source>



ScrollPaneConstants.LOWER_LEFT_CORNER

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Rectangle; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; public class Main extends JFrame { 

 private JLabel label = new JLabel(new ImageIcon("largejexpLogo.gif"));
 public Main() {
   super("JScrollPane Demo");
   JScrollPane scrollPane = new JScrollPane(label);
   JLabel[] corners = new JLabel[4];
   for (int i = 0; i < 4; i++) {
     corners[i] = new JLabel();
     corners[i].setBackground(Color.white);
     corners[i].setOpaque(true);
   }
   JLabel rowheader = new JLabel() {
     public void paintComponent(Graphics g) {
       super.paintComponent(g);
       Rectangle rect = g.getClipBounds();
       for (int i = 50 - (rect.y % 50); i < rect.height; i += 50) {
         g.drawLine(0, rect.y + i, 3, rect.y + i);
         g.drawString("" + (rect.y + i), 6, rect.y + i + 3);
       }
     }
     public Dimension getPreferredSize() {
       return new Dimension(25, (int) label.getPreferredSize()
           .getHeight());
     }
   };
   rowheader.setBackground(Color.white);
   rowheader.setOpaque(true);
   JLabel columnheader = new JLabel() {
     public void paintComponent(Graphics g) {
       super.paintComponent(g);
       Rectangle r = g.getClipBounds();
       for (int i = 50 - (r.x % 50); i < r.width; i += 50) {
         g.drawLine(r.x + i, 0, r.x + i, 3);
         g.drawString("" + (r.x + i), r.x + i - 10, 16);
       }
     }
     public Dimension getPreferredSize() {
       return new Dimension((int) label.getPreferredSize().getWidth(),
           25);
     }
   };
   columnheader.setBackground(Color.white);
   columnheader.setOpaque(true);
   scrollPane.setRowHeaderView(rowheader);
   scrollPane.setColumnHeaderView(columnheader);
   scrollPane.setCorner(JScrollPane.LOWER_LEFT_CORNER, corners[0]);
   scrollPane.setCorner(JScrollPane.LOWER_RIGHT_CORNER, corners[1]);
   scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, corners[2]);
   scrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER, corners[3]);
   getContentPane().add(scrollPane);
   setSize(400, 300);
   setVisible(true);
 }
 public static void main(String[] args) {
   new Main();
 }

} 


 </source>



ScrollPaneConstants.LOWER_RIGHT_CORNER

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Rectangle; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; public class Main extends JFrame { 

 private JLabel label = new JLabel(new ImageIcon("largejexpLogo.gif"));
 public Main() {
   super("JScrollPane Demo");
   JScrollPane scrollPane = new JScrollPane(label);
   JLabel[] corners = new JLabel[4];
   for (int i = 0; i < 4; i++) {
     corners[i] = new JLabel();
     corners[i].setBackground(Color.white);
     corners[i].setOpaque(true);
   }
   JLabel rowheader = new JLabel() {
     public void paintComponent(Graphics g) {
       super.paintComponent(g);
       Rectangle rect = g.getClipBounds();
       for (int i = 50 - (rect.y % 50); i < rect.height; i += 50) {
         g.drawLine(0, rect.y + i, 3, rect.y + i);
         g.drawString("" + (rect.y + i), 6, rect.y + i + 3);
       }
     }
     public Dimension getPreferredSize() {
       return new Dimension(25, (int) label.getPreferredSize()
           .getHeight());
     }
   };
   rowheader.setBackground(Color.white);
   rowheader.setOpaque(true);
   JLabel columnheader = new JLabel() {
     public void paintComponent(Graphics g) {
       super.paintComponent(g);
       Rectangle r = g.getClipBounds();
       for (int i = 50 - (r.x % 50); i < r.width; i += 50) {
         g.drawLine(r.x + i, 0, r.x + i, 3);
         g.drawString("" + (r.x + i), r.x + i - 10, 16);
       }
     }
     public Dimension getPreferredSize() {
       return new Dimension((int) label.getPreferredSize().getWidth(),
           25);
     }
   };
   columnheader.setBackground(Color.white);
   columnheader.setOpaque(true);
   scrollPane.setRowHeaderView(rowheader);
   scrollPane.setColumnHeaderView(columnheader);
   scrollPane.setCorner(JScrollPane.LOWER_LEFT_CORNER, corners[0]);
   scrollPane.setCorner(JScrollPane.LOWER_RIGHT_CORNER, corners[1]);
   scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, corners[2]);
   scrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER, corners[3]);
   getContentPane().add(scrollPane);
   setSize(400, 300);
   setVisible(true);
 }
 public static void main(String[] args) {
   new Main();
 }

} 


 </source>



ScrollPaneConstants.UPPER_LEFT_CORNER

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Rectangle; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; public class Main extends JFrame { 

 private JLabel label = new JLabel(new ImageIcon("largejexpLogo.gif"));
 public Main() {
   super("JScrollPane Demo");
   JScrollPane scrollPane = new JScrollPane(label);
   JLabel[] corners = new JLabel[4];
   for (int i = 0; i < 4; i++) {
     corners[i] = new JLabel();
     corners[i].setBackground(Color.white);
     corners[i].setOpaque(true);
   }
   JLabel rowheader = new JLabel() {
     public void paintComponent(Graphics g) {
       super.paintComponent(g);
       Rectangle rect = g.getClipBounds();
       for (int i = 50 - (rect.y % 50); i < rect.height; i += 50) {
         g.drawLine(0, rect.y + i, 3, rect.y + i);
         g.drawString("" + (rect.y + i), 6, rect.y + i + 3);
       }
     }
     public Dimension getPreferredSize() {
       return new Dimension(25, (int) label.getPreferredSize()
           .getHeight());
     }
   };
   rowheader.setBackground(Color.white);
   rowheader.setOpaque(true);
   JLabel columnheader = new JLabel() {
     public void paintComponent(Graphics g) {
       super.paintComponent(g);
       Rectangle r = g.getClipBounds();
       for (int i = 50 - (r.x % 50); i < r.width; i += 50) {
         g.drawLine(r.x + i, 0, r.x + i, 3);
         g.drawString("" + (r.x + i), r.x + i - 10, 16);
       }
     }
     public Dimension getPreferredSize() {
       return new Dimension((int) label.getPreferredSize().getWidth(),
           25);
     }
   };
   columnheader.setBackground(Color.white);
   columnheader.setOpaque(true);
   scrollPane.setRowHeaderView(rowheader);
   scrollPane.setColumnHeaderView(columnheader);
   scrollPane.setCorner(JScrollPane.LOWER_LEFT_CORNER, corners[0]);
   scrollPane.setCorner(JScrollPane.LOWER_RIGHT_CORNER, corners[1]);
   scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, corners[2]);
   scrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER, corners[3]);
   getContentPane().add(scrollPane);
   setSize(400, 300);
   setVisible(true);
 }
 public static void main(String[] args) {
   new Main();
 }

} 


 </source>



ScrollPaneConstants.UPPER_RIGHT_CORNER

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Rectangle; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; public class Main extends JFrame { 

 private JLabel label = new JLabel(new ImageIcon("largejexpLogo.gif"));
 public Main() {
   super("JScrollPane Demo");
   JScrollPane scrollPane = new JScrollPane(label);
   JLabel[] corners = new JLabel[4];
   for (int i = 0; i < 4; i++) {
     corners[i] = new JLabel();
     corners[i].setBackground(Color.white);
     corners[i].setOpaque(true);
   }
   JLabel rowheader = new JLabel() {
     public void paintComponent(Graphics g) {
       super.paintComponent(g);
       Rectangle rect = g.getClipBounds();
       for (int i = 50 - (rect.y % 50); i < rect.height; i += 50) {
         g.drawLine(0, rect.y + i, 3, rect.y + i);
         g.drawString("" + (rect.y + i), 6, rect.y + i + 3);
       }
     }
     public Dimension getPreferredSize() {
       return new Dimension(25, (int) label.getPreferredSize()
           .getHeight());
     }
   };
   rowheader.setBackground(Color.white);
   rowheader.setOpaque(true);
   JLabel columnheader = new JLabel() {
     public void paintComponent(Graphics g) {
       super.paintComponent(g);
       Rectangle r = g.getClipBounds();
       for (int i = 50 - (r.x % 50); i < r.width; i += 50) {
         g.drawLine(r.x + i, 0, r.x + i, 3);
         g.drawString("" + (r.x + i), r.x + i - 10, 16);
       }
     }
     public Dimension getPreferredSize() {
       return new Dimension((int) label.getPreferredSize().getWidth(),
           25);
     }
   };
   columnheader.setBackground(Color.white);
   columnheader.setOpaque(true);
   scrollPane.setRowHeaderView(rowheader);
   scrollPane.setColumnHeaderView(columnheader);
   scrollPane.setCorner(JScrollPane.LOWER_LEFT_CORNER, corners[0]);
   scrollPane.setCorner(JScrollPane.LOWER_RIGHT_CORNER, corners[1]);
   scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, corners[2]);
   scrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER, corners[3]);
   getContentPane().add(scrollPane);
   setSize(400, 300);
   setVisible(true);
 }
 public static void main(String[] args) {
   new Main();
 }

} 


 </source>



ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Container; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.ScrollPaneConstants; import javax.swing.WindowConstants; public class Main extends JFrame { 

 JTextArea textArea;
 public Main() {
   super();
   this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
   Container contentPane = this.getContentPane();
   textArea = new JTextArea();
   JScrollPane pane = new JScrollPane(textArea, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
       ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
   contentPane.add(pane, BorderLayout.CENTER);
 }
 public static void main(String[] args) {
   JFrame f = new Main();
   f.setSize(300, 200);
   f.setVisible(true);
 }

} 


 </source>



ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED

   <source lang="java">

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);
 }

} 


 </source>
Источник — «http://jexp.ru/index.php?title=Java_by_API/javax.swing/ScrollPaneConstants&oldid=717»