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Java by API/javax.swing/JViewport - История изменений
2026-04-21T13:40:00Z
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в 17:43, 31 мая 2010
2010-05-31T17:43:48Z
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http://www.jexp.ru/index.php?title=Java_by_API/javax.swing/JViewport&diff=666&oldid=prev
Admin: 1 версия
2010-05-31T14:19:07Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== JViewport: setView(Component com) ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
<br />
import java.awt.BorderLayout;<br />
import javax.swing.JFrame;<br />
import javax.swing.JLabel;<br />
import javax.swing.JScrollPane;<br />
import javax.swing.JTable;<br />
import javax.swing.JViewport;<br />
public class MainClass {<br />
public static void main(final String args[]) {<br />
final Object rows[][] = { { "one", "1" }, { "two", "2" },<br />
{ "three", "3" } };<br />
final Object headers[] = { "English", "Digit" };<br />
<br />
JFrame frame = new JFrame("Scrollless Table");<br />
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);<br />
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JTable table = new JTable(rows,headers);<br />
<br />
JScrollPane scrollPane = new JScrollPane(table);<br />
JViewport viewport = new JViewport();<br />
viewport.setView(table);<br />
scrollPane.setColumnHeaderView( new JLabel("table header here"));<br />
scrollPane.setRowHeaderView(viewport);<br />
<br />
frame.add(scrollPane, BorderLayout.CENTER);<br />
frame.setSize(300, 150);<br />
frame.setVisible(true);<br />
}<br />
}<br />
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</source><br />
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<!-- end source code --><br />
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== JViewport: setViewPosition(Point p) ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
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import java.awt.Container;<br />
import java.awt.Cursor;<br />
import java.awt.Point;<br />
import java.awt.event.MouseEvent;<br />
import javax.swing.ImageIcon;<br />
import javax.swing.JFrame;<br />
import javax.swing.JLabel;<br />
import javax.swing.JScrollPane;<br />
import javax.swing.JViewport;<br />
import javax.swing.event.MouseInputAdapter;<br />
public class Main extends JFrame {<br />
public Main() {<br />
super("Grab and drag Demo");<br />
ImageIcon ii = new ImageIcon("largejexpLogo.jpg");<br />
JScrollPane jsp = new JScrollPane(new GrabAndScrollLabel(ii));<br />
getContentPane().add(jsp);<br />
setSize(300, 250);<br />
setVisible(true);<br />
super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);<br />
}<br />
public static void main(String[] args) {<br />
new Main();<br />
}<br />
}<br />
class GrabAndScrollLabel extends JLabel {<br />
public GrabAndScrollLabel(ImageIcon i) {<br />
super(i);<br />
MouseInputAdapter mia = new MouseInputAdapter() {<br />
int xDiff, yDiff;<br />
Container c;<br />
public void mouseDragged(MouseEvent e) {<br />
c = GrabAndScrollLabel.this.getParent();<br />
if (c instanceof JViewport) {<br />
JViewport jv = (JViewport) c;<br />
Point p = jv.getViewPosition();<br />
int newX = p.x - (e.getX() - xDiff);<br />
int newY = p.y - (e.getY() - yDiff);<br />
int maxX = GrabAndScrollLabel.this.getWidth() - jv.getWidth();<br />
int maxY = GrabAndScrollLabel.this.getHeight() - jv.getHeight();<br />
if (newX < 0)<br />
newX = 0;<br />
if (newX > maxX)<br />
newX = maxX;<br />
if (newY < 0)<br />
newY = 0;<br />
if (newY > maxY)<br />
newY = maxY;<br />
jv.setViewPosition(new Point(newX, newY));<br />
}<br />
}<br />
public void mousePressed(MouseEvent e) {<br />
setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));<br />
xDiff = e.getX();<br />
yDiff = e.getY();<br />
}<br />
public void mouseReleased(MouseEvent e) {<br />
setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));<br />
}<br />
};<br />
addMouseMotionListener(mia);<br />
addMouseListener(mia);<br />
}<br />
}<br />
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</source><br />
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<!-- end source code --><br />
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== new JViewport() ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
<br />
import java.awt.BorderLayout;<br />
import javax.swing.JFrame;<br />
import javax.swing.JLabel;<br />
import javax.swing.JScrollPane;<br />
import javax.swing.JTable;<br />
import javax.swing.JViewport;<br />
public class MainClass {<br />
public static void main(final String args[]) {<br />
final Object rows[][] = { { "one", "1" }, { "two", "2" },<br />
{ "three", "3" } };<br />
final Object headers[] = { "English", "Digit" };<br />
<br />
JFrame frame = new JFrame("Scrollless Table");<br />
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);<br />
<br />
JTable table = new JTable(rows,headers);<br />
<br />
JScrollPane scrollPane = new JScrollPane(table);<br />
JViewport viewport = new JViewport();<br />
viewport.setView(table);<br />
scrollPane.setColumnHeaderView( new JLabel("table header here"));<br />
scrollPane.setRowHeaderView(viewport);<br />
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frame.add(scrollPane, BorderLayout.CENTER);<br />
frame.setSize(300, 150);<br />
frame.setVisible(true);<br />
}<br />
}<br />
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</source><br />
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<!-- end source code --></div>
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