Java/Swing JFC/Scrollpane
Содержание
- 1 A simple JScrollPane demonstration
- 2 A simple JScrollPane for a JList component
- 3 Controlling the scrollbars in a JScrollPane
- 4 Create a scrollable list
- 5 Creating a JScrollPane Container
- 6 Customized ScrollPane
- 7 JScrollPane with row and column headers
- 8 JViewport: Move and View
- 9 Scrolling Programmatically
- 10 Scrollpane ruler
- 11 ScrollPane Sample
- 12 ScrollPane with image
- 13 Watermark JScrollPane
A simple JScrollPane demonstration
<source lang="java">
/* Java Swing, 2nd Edition By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole ISBN: 0-596-00408-7 Publisher: O"Reilly
- /
// ScrollDemo.java //A simple JScrollPane demonstration. // import java.awt.BorderLayout; import java.awt.GridLayout; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JScrollPane; public class ScrollDemo extends JFrame {
JScrollPane scrollpane;
public ScrollDemo() {
super("JScrollPane Demonstration");
setSize(300, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
init();
setVisible(true);
}
public void init() {
JRadioButton form[][] = new JRadioButton[12][5];
String counts[] = { "", "0-1", "2-5", "6-10", "11-100", "101+" };
String categories[] = { "Household", "Office", "Extended Family",
"Company (US)", "Company (World)", "Team", "Will",
"Birthday Card List", "High School", "Country", "Continent",
"Planet" };
JPanel p = new JPanel();
p.setSize(600, 400);
p.setLayout(new GridLayout(13, 6, 10, 0));
for (int row = 0; row < 13; row++) {
ButtonGroup bg = new ButtonGroup();
for (int col = 0; col < 6; col++) {
if (row == 0) {
p.add(new JLabel(counts[col]));
} else {
if (col == 0) {
p.add(new JLabel(categories[row - 1]));
} else {
form[row - 1][col - 1] = new JRadioButton();
bg.add(form[row - 1][col - 1]);
p.add(form[row - 1][col - 1]);
}
}
}
}
scrollpane = new JScrollPane(p);
getContentPane().add(scrollpane, BorderLayout.CENTER);
}
public static void main(String args[]) {
new ScrollDemo();
}
}
</source>
A simple JScrollPane for a JList component
<source lang="java">
/* Java Swing, 2nd Edition By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole ISBN: 0-596-00408-7 Publisher: O"Reilly
- /
// ScrollList.java //A simple JScrollPane for a JList component. // import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; public class ScrollList extends JFrame {
JScrollPane scrollpane;
public ScrollList() {
super("JScrollPane Demonstration");
setSize(300, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
String categories[] = { "Household", "Office", "Extended Family",
"Company (US)", "Company (World)", "Team", "Will",
"Birthday Card List", "High School", "Country", "Continent",
"Planet" };
JList list = new JList(categories);
scrollpane = new JScrollPane(list);
getContentPane().add(scrollpane, BorderLayout.CENTER);
}
public static void main(String args[]) {
ScrollList sl = new ScrollList();
sl.setVisible(true);
}
}
</source>
Controlling the scrollbars in a JScrollPane
<source lang="java">
// : c14:JScrollPanes.java // Controlling the scrollbars in a JScrollPane. // <applet code=JScrollPanes width=300 height=725></applet> // From "Thinking in Java, 3rd ed." (c) Bruce Eckel 2002 // www.BruceEckel.ru. See copyright notice in CopyRight.txt. import java.awt.Color; import java.awt.Container; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.BorderFactory; import javax.swing.JApplet; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.border.Border; public class JScrollPanes extends JApplet {
private JButton b1 = new JButton("Text Area 1"), b2 = new JButton(
"Text Area 2"), b3 = new JButton("Replace Text"), b4 = new JButton(
"Insert Text");
private JTextArea t1 = new JTextArea("t1", 1, 20), t2 = new JTextArea("t2",
4, 20), t3 = new JTextArea("t3", 1, 20), t4 = new JTextArea("t4",
10, 10), t5 = new JTextArea("t5", 4, 20), t6 = new JTextArea("t6",
10, 10);
private JScrollPane sp3 = new JScrollPane(t3,
JScrollPane.VERTICAL_SCROLLBAR_NEVER,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER), sp4 = new JScrollPane(t4,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER), sp5 = new JScrollPane(t5,
JScrollPane.VERTICAL_SCROLLBAR_NEVER,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS), sp6 = new JScrollPane(t6,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
class B1L implements ActionListener {
public void actionPerformed(ActionEvent e) {
t5.append(t1.getText() + "\n");
}
}
class B2L implements ActionListener {
public void actionPerformed(ActionEvent e) {
t2.setText("Inserted by Button 2");
t2.append(": " + t1.getText());
t5.append(t2.getText() + "\n");
}
}
class B3L implements ActionListener {
public void actionPerformed(ActionEvent e) {
String s = " Replacement ";
t2.replaceRange(s, 3, 3 + s.length());
}
}
class B4L implements ActionListener {
public void actionPerformed(ActionEvent e) {
t2.insert(" Inserted ", 10);
}
}
public void init() {
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
// Create Borders for components:
Border brd = BorderFactory.createMatteBorder(1, 1, 1, 1, Color.BLACK);
t1.setBorder(brd);
t2.setBorder(brd);
sp3.setBorder(brd);
sp4.setBorder(brd);
sp5.setBorder(brd);
sp6.setBorder(brd);
// Initialize listeners and add components:
b1.addActionListener(new B1L());
cp.add(b1);
cp.add(t1);
b2.addActionListener(new B2L());
cp.add(b2);
cp.add(t2);
b3.addActionListener(new B3L());
cp.add(b3);
b4.addActionListener(new B4L());
cp.add(b4);
cp.add(sp3);
cp.add(sp4);
cp.add(sp5);
cp.add(sp6);
}
public static void main(String[] args) {
run(new JScrollPanes(), 300, 725);
}
public static void run(JApplet applet, int width, int height) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(applet);
frame.setSize(width, height);
applet.init();
applet.start();
frame.setVisible(true);
}
} ///:~
</source>
Create a scrollable list
<source lang="java">
import javax.swing.JList; import javax.swing.JScrollPane; public class Main {
public static void main(String[] argv) throws Exception {
JList list = new JList();
JScrollPane scrollableList = new JScrollPane(list);
}
}
</source>
Creating a JScrollPane Container
<source lang="java">
import javax.swing.JScrollPane; import javax.swing.JTextArea; public class Main {
public static void main(String[] argv) throws Exception {
// Create a scrollable text area
JTextArea textArea = new JTextArea();
JScrollPane scrollableTextArea = new JScrollPane(textArea);
}
}
</source>
Customized ScrollPane
<source lang="java">
import java.awt.Dimension; import java.awt.event.AdjustmentEvent; import java.awt.event.AdjustmentListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.ImageIcon; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollBar; public class CustomScrollPane extends JPanel {
protected JScrollBar verticalBar = new JScrollBar(JScrollBar.VERTICAL, 0, 0, 0, 0);
protected JScrollBar horizontalBar = new JScrollBar(JScrollBar.HORIZONTAL, 0, 0, 0, 0);
protected CustomViewport viewport = new CustomViewport();
protected JComponent innerComponent;
public CustomScrollPane(JComponent comp) {
setLayout(null);
add(viewport);
innerComponent = comp;
viewport.add(innerComponent);
verticalBar.setUnitIncrement(5);
add(verticalBar);
horizontalBar.setUnitIncrement(5);
add(horizontalBar);
AdjustmentListener lst = new AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent e) {
viewport.doLayout();
}
};
verticalBar.addAdjustmentListener(lst);
horizontalBar.addAdjustmentListener(lst);
}
public void doLayout() {
Dimension size = getSize();
Dimension innerComponentSize = innerComponent.getPreferredSize();
Dimension verticalBarSize = verticalBar.getPreferredSize();
Dimension horizontalBarSize = horizontalBar.getPreferredSize();
int width = Math.max(size.width - verticalBarSize.width - 1, 0);
int height = Math.max(size.height - horizontalBarSize.height - 1, 0);
viewport.setBounds(0, 0, width, height);
verticalBar.setBounds(width + 1, 0, verticalBarSize.width, height);
horizontalBar.setBounds(0, height + 1, width, horizontalBarSize.height);
int maxWidth = Math.max(innerComponentSize.width - width, 0);
horizontalBar.setMaximum(maxWidth);
horizontalBar.setBlockIncrement(maxWidth / 5);
horizontalBar.setEnabled(maxWidth > 0);
int maxHeight = Math.max(innerComponentSize.height - height, 0);
verticalBar.setMaximum(maxHeight);
verticalBar.setBlockIncrement(maxHeight / 5);
verticalBar.setEnabled(maxHeight > 0);
horizontalBar.setVisibleAmount(horizontalBar.getBlockIncrement());
verticalBar.setVisibleAmount(verticalBar.getBlockIncrement());
}
public Dimension getPreferredSize() {
Dimension innerComponmentSize = innerComponent.getPreferredSize();
Dimension verticalBarSize = verticalBar.getPreferredSize();
Dimension d2 = horizontalBar.getPreferredSize();
Dimension horizontalBarSize = new Dimension(innerComponmentSize.width
+ verticalBarSize.width, innerComponmentSize.height + d2.height);
return horizontalBarSize;
}
class CustomViewport extends JPanel {
public CustomViewport(){
setLayout(null);
}
public void doLayout() {
Dimension innerComponentSize = innerComponent.getPreferredSize();
int x = horizontalBar.getValue();
int y = verticalBar.getValue();
innerComponent.setBounds(-x, -y, innerComponentSize.width,
innerComponentSize.height);
}
}
public static void main(String[] args) {
JFrame f = new JFrame("JScrollBar Demo");
f.setSize(300, 250);
ImageIcon icon = new ImageIcon("earth.jpg");
CustomScrollPane myScrollPane = new CustomScrollPane(new JLabel(icon));
f.getContentPane().add(myScrollPane);
WindowListener wndCloser = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
};
f.addWindowListener(wndCloser);
f.setVisible(true);
}
}
</source>
JScrollPane with row and column headers
<source lang="java">
/* Java Swing, 2nd Edition By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole ISBN: 0-596-00408-7 Publisher: O"Reilly
- /
// ScrollDemo2.java //Another JScrollPane demonstration. This version activates some of the //features of JScrollPane such as row and column headers. // import java.awt.BorderLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.ButtonGroup; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JScrollPane; import javax.swing.JViewport; import javax.swing.ScrollPaneConstants; public class ScrollDemo2 extends JFrame {
JScrollPane scrollpane;
public ScrollDemo2() {
super("JScrollPane Demonstration");
setSize(300, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
init();
setVisible(true);
}
public void init() {
JRadioButton form[][] = new JRadioButton[12][5];
String counts[] = { "", "0-1", "2-5", "6-10", "11-100", "101+" };
String categories[] = { "Household", "Office", "Extended Family",
"Company (US)", "Company (World)", "Team", "Will",
"Birthday Card List", "High School", "Country", "Continent",
"Planet" };
JPanel p = new JPanel();
p.setSize(600, 400);
p.setLayout(new GridLayout(13, 6, 10, 0));
for (int row = 0; row < 13; row++) {
ButtonGroup bg = new ButtonGroup();
for (int col = 0; col < 6; col++) {
if (row == 0) {
p.add(new JLabel(counts[col]));
} else {
if (col == 0) {
p.add(new JLabel(categories[row - 1]));
} else {
form[row - 1][col - 1] = new JRadioButton();
bg.add(form[row - 1][col - 1]);
p.add(form[row - 1][col - 1]);
}
}
}
}
scrollpane = new JScrollPane(p);
// Add in some JViewports for the column and row headers
JViewport jv1 = new JViewport();
jv1.setView(new JLabel(new ImageIcon("columnlabel.gif")));
scrollpane.setColumnHeader(jv1);
JViewport jv2 = new JViewport();
jv2.setView(new JLabel(new ImageIcon("rowlabel.gif")));
scrollpane.setRowHeader(jv2);
// And throw in an information button
JButton jb1 = new JButton(new ImageIcon("question.gif"));
jb1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
JOptionPane.showMessageDialog(null,
"This is an Active Corner!", "Information",
JOptionPane.INFORMATION_MESSAGE);
}
});
scrollpane.setCorner(ScrollPaneConstants.UPPER_LEFT_CORNER, jb1);
getContentPane().add(scrollpane, BorderLayout.CENTER);
}
public static void main(String args[]) {
new ScrollDemo2();
}
}
</source>
JViewport: Move and View
<source lang="java">
/* Definitive Guide to Swing for Java 2, Second Edition By John Zukowski ISBN: 1-893115-78-X Publisher: APress
- /
import java.awt.BorderLayout; import java.awt.Container; import java.awt.Dimension; import java.awt.Point; import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.ActionMap; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.InputMap; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JViewport; import javax.swing.KeyStroke; public class MoveViewSample {
public static final int INCREASE = 0; // direction
public static final int DECREASE = 1; // direction
public static final int X_AXIS = 0; // axis
public static final int Y_AXIS = 1; // axis
public static final int UNIT = 0; // type
public static final int BLOCK = 1; // type
static class MoveAction extends AbstractAction {
JViewport viewport;
int direction;
int axis;
int type;
public MoveAction(JViewport viewport, int direction, int axis, int type) {
if (viewport == null) {
throw new IllegalArgumentException(
"null viewport not permitted");
}
this.viewport = viewport;
this.direction = direction;
this.axis = axis;
this.type = type;
}
public void actionPerformed(ActionEvent actionEvent) {
Dimension extentSize = viewport.getExtentSize();
int horizontalMoveSize = 0;
int verticalMoveSize = 0;
if (axis == X_AXIS) {
if (type == UNIT) {
horizontalMoveSize = 1;
} else { // type == BLOCK
horizontalMoveSize = extentSize.width;
}
} else { // axis == Y_AXIS
if (type == UNIT) {
verticalMoveSize = 1;
} else { // type == BLOCK
verticalMoveSize = extentSize.height;
}
}
if (direction == DECREASE) {
horizontalMoveSize = -horizontalMoveSize;
verticalMoveSize = -verticalMoveSize;
}
// Translate origin by some amount
Point origin = viewport.getViewPosition();
origin.x += horizontalMoveSize;
origin.y += verticalMoveSize;
// set new viewing origin
viewport.setViewPosition(origin);
}
}
public static void main(String args[]) {
JFrame frame = new JFrame("JViewport Sample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Icon icon = new ImageIcon("dog.jpg");
JLabel dogLabel = new JLabel(icon);
JViewport viewport = new JViewport();
viewport.setView(dogLabel);
InputMap inputMap = viewport
.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
ActionMap actionMap = viewport.getActionMap();
// Up key moves view up unit
Action upKeyAction = new MoveAction(viewport, DECREASE, Y_AXIS, UNIT);
KeyStroke upKey = KeyStroke.getKeyStroke("UP");
inputMap.put(upKey, "up");
actionMap.put("up", upKeyAction);
// Down key moves view down unit
Action downKeyAction = new MoveAction(viewport, INCREASE, Y_AXIS, UNIT);
KeyStroke downKey = KeyStroke.getKeyStroke("DOWN");
inputMap.put(downKey, "down");
actionMap.put("down", downKeyAction);
// Left key moves view left unit
Action leftKeyAction = new MoveAction(viewport, DECREASE, X_AXIS, UNIT);
KeyStroke leftKey = KeyStroke.getKeyStroke("LEFT");
inputMap.put(leftKey, "left");
actionMap.put("left", leftKeyAction);
// Right key moves view right unit
Action rightKeyAction = new MoveAction(viewport, INCREASE, X_AXIS, UNIT);
KeyStroke rightKey = KeyStroke.getKeyStroke("RIGHT");
inputMap.put(rightKey, "right");
actionMap.put("right", rightKeyAction);
// PgUp key moves view up block
Action pgUpKeyAction = new MoveAction(viewport, DECREASE, Y_AXIS, BLOCK);
KeyStroke pgUpKey = KeyStroke.getKeyStroke("PAGE_UP");
inputMap.put(pgUpKey, "pgUp");
actionMap.put("pgUp", pgUpKeyAction);
// PgDn key moves view down block
Action pgDnKeyAction = new MoveAction(viewport, INCREASE, Y_AXIS, BLOCK);
KeyStroke pgDnKey = KeyStroke.getKeyStroke("PAGE_DOWN");
inputMap.put(pgDnKey, "pgDn");
actionMap.put("pgDn", pgDnKeyAction);
// Shift-PgUp key moves view left block
Action shiftPgUpKeyAction = new MoveAction(viewport, DECREASE, X_AXIS,
BLOCK);
KeyStroke shiftPgUpKey = KeyStroke.getKeyStroke("shift PAGE_UP");
inputMap.put(shiftPgUpKey, "shiftPgUp");
actionMap.put("shiftPgUp", shiftPgUpKeyAction);
// Shift-PgDn key moves view right block
Action shiftPgDnKeyAction = new MoveAction(viewport, INCREASE, X_AXIS,
BLOCK);
KeyStroke shiftPgDnKey = KeyStroke.getKeyStroke("shift PAGE_DOWN");
inputMap.put(shiftPgDnKey, "shiftPgDn");
actionMap.put("shiftPgDn", shiftPgDnKeyAction);
Container contentPane = frame.getContentPane();
contentPane.add(viewport, BorderLayout.CENTER);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
</source>
Scrolling Programmatically
<source lang="java">
import java.awt.BorderLayout; import java.awt.Insets; import java.awt.Point; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JViewport; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class ButtonScroll extends JFrame {
protected JViewport viewport;
protected JButton upButton;
protected JButton downButton;
protected JButton leftButton;
protected JButton rightButton;
protected int pgVertical;
protected int pgHorzontal;
public ButtonScroll() {
super("Scrolling Programmatically");
setSize(400, 400);
getContentPane().setLayout(new BorderLayout());
ImageIcon shuttle = new ImageIcon("largejexpLogo.GIF");
pgVertical = shuttle.getIconHeight() / 5;
pgHorzontal = shuttle.getIconWidth() / 5;
JLabel lbl = new JLabel(shuttle);
viewport = new JViewport();
viewport.setView(lbl);
viewport.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
enableButtons(ButtonScroll.this.viewport.getViewPosition());
}
});
getContentPane().add(viewport, BorderLayout.CENTER);
JPanel pv = new JPanel(new BorderLayout());
upButton = createButton("up", "u");
ActionListener lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
movePanel(0, -1);
}
};
upButton.addActionListener(lst);
pv.add(upButton, BorderLayout.NORTH);
downButton = createButton("down", "d");
lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
movePanel(0, 1);
}
};
downButton.addActionListener(lst);
pv.add(downButton, BorderLayout.SOUTH);
getContentPane().add(pv, BorderLayout.EAST);
JPanel ph = new JPanel(new BorderLayout());
leftButton = createButton("left", "l");
lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
movePanel(-1, 0);
}
};
leftButton.addActionListener(lst);
ph.add(leftButton, BorderLayout.WEST);
rightButton = createButton("right", "r");
lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
movePanel(1, 0);
}
};
rightButton.addActionListener(lst);
ph.add(rightButton, BorderLayout.EAST);
getContentPane().add(ph, BorderLayout.SOUTH);
WindowListener wndCloser = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
};
addWindowListener(wndCloser);
setVisible(true);
movePanel(0, 0);
}
protected JButton createButton(String name, char mnemonics) {
JButton btn = new JButton(name );
btn.setToolTipText("Move " + name);
btn.setBorderPainted(false);
btn.setMargin(new Insets(0, 0, 0, 0));
btn.setContentAreaFilled(false);
btn.setMnemonic(mnemonics);
return btn;
}
protected void movePanel(int xmove, int ymove) {
Point pt = viewport.getViewPosition();
pt.x += pgHorzontal * xmove;
pt.y += pgVertical * ymove;
pt.x = Math.max(0, pt.x);
pt.x = Math.min(getMaxXExtent(), pt.x);
pt.y = Math.max(0, pt.y);
pt.y = Math.min(getMaxYExtent(), pt.y);
viewport.setViewPosition(pt);
enableButtons(pt);
}
protected void enableButtons(Point pt) {
if (pt.x == 0)
enableComponent(leftButton, false);
else
enableComponent(leftButton, true);
if (pt.x >= getMaxXExtent())
enableComponent(rightButton, false);
else
enableComponent(rightButton, true);
if (pt.y == 0)
enableComponent(upButton, false);
else
enableComponent(upButton, true);
if (pt.y >= getMaxYExtent())
enableComponent(downButton, false);
else
enableComponent(downButton, true);
}
protected void enableComponent(JComponent c, boolean b) {
if (c.isEnabled() != b)
c.setEnabled(b);
}
protected int getMaxXExtent() {
return viewport.getView().getWidth() - viewport.getWidth();
}
protected int getMaxYExtent() {
return viewport.getView().getHeight() - viewport.getHeight();
}
public static void main(String argv[]) {
new ButtonScroll();
}
}
</source>
Scrollpane ruler
<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 HeaderDemo extends JFrame {
private JLabel label = new JLabel(new ImageIcon("largejexpLogo.gif"));
public HeaderDemo() {
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 HeaderDemo();
}
}
</source>
ScrollPane Sample
<source lang="java">
import java.awt.BorderLayout; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; public class ScrollSample {
public static void main(String args[]) {
String title = (args.length == 0 ? "JScrollPane Sample" : args[0]);
JFrame frame = new JFrame(title);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Icon icon = new ImageIcon("dog.jpg");
JLabel dogLabel = new JLabel(icon);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportView(dogLabel);
// scrollPane.getViewport().setView(dogLabel);
frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
</source>
ScrollPane with image
<source lang="java">
import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; public class ScrollPaneDemo extends JFrame {
public ScrollPaneDemo() {
super("JScrollPane Demo");
ImageIcon ii = new ImageIcon("largejexpLogo.jpg");
JScrollPane jsp = new JScrollPane(new JLabel(ii));
getContentPane().add(jsp);
setSize(300, 250);
setVisible(true);
}
public static void main(String[] args) {
new ScrollPaneDemo();
}
}
</source>
Watermark JScrollPane
<source lang="java">
/* Swing Hacks Tips and Tools for Killer GUIs By Joshua Marinacci, Chris Adamson First Edition June 2005 Series: Hacks ISBN: 0-596-00907-0 Pages: 542 website: http://www.oreilly.ru/catalog/swinghks/
- /
import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.TexturePaint; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.net.URL; import javax.imageio.ImageIO; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JViewport; public class ScrollPaneWatermark extends JViewport {
BufferedImage fgimage, bgimage;
TexturePaint texture;
public ScrollPaneWatermark() {
super();
// setOpaque(false);
}
public void setBackgroundTexture(URL url) throws IOException {
bgimage = ImageIO.read(url);
Rectangle rect = new Rectangle(0, 0, bgimage.getWidth(null), bgimage.getHeight(null));
texture = new TexturePaint(bgimage, rect);
}
public void setForegroundBadge(URL url) throws IOException {
fgimage = ImageIO.read(url);
}
public void paintComponent(Graphics g) {
// do the superclass behavior first
super.paintComponent(g);
// paint the texture
if (texture != null) {
Graphics2D g2 = (Graphics2D) g;
g2.setPaint(texture);
g.fillRect(0, 0, getWidth(), getHeight());
}
}
public void paintChildren(Graphics g) {
super.paintChildren(g);
if (fgimage != null) {
g.drawImage(fgimage, getWidth() - fgimage.getWidth(null), 0, null);
}
}
public void setView(JComponent view) {
view.setOpaque(false);
super.setView(view);
}
public static void main(String[] args) throws Exception {
JFrame frame = new JFrame();
JTextArea ta = new JTextArea();
for (int i = 0; i < 1000; i++) {
ta.append(Integer.toString(i) + " ");
}
ta.setLineWrap(true);
ta.setWrapStyleWord(true);
// ta.setOpaque(false);
ScrollPaneWatermark watermark = new ScrollPaneWatermark();
watermark.setBackgroundTexture(new File("background.jpg").toURL());
watermark.setForegroundBadge(new File("foreground.png").toURL());
watermark.setView(ta);
JScrollPane scroll = new JScrollPane();
scroll.setViewport(watermark);
frame.getContentPane().add(scroll);
frame.pack();
frame.setSize(600, 600);
frame.setVisible(true);
}
}
</source>
