I'm using a JTable and adding it to a panel which uses a gridbaglayout like so:
JTable qdbs = new JTable(rowData, columnNamesVector);
qdbs.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
panel.add(qdbs, c);
I don't want the table to be in a scroll pane, but I do want the table to take up the entire width of the panel. How would I accomplish this?
An SSCCE as requested:
import javax.swing.*;
import java.awt.*;
public class Main{
public static void main(String[] args) {
new TestFrame();
}
public static class TestFrame extends JFrame{
public TestFrame() {
this.setTitle("SSCCE");
JPanel panel = new JPanel();
panel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.insets = new Insets(10,10,10,10);
JTable testTable = new JTable(10,2);
panel.add(testTable, c);
this.add(panel);
this.pack();
this.setVisible(true);
}
}
}
I would like this table to always take up the entire width of the panel (except the insets). Currently the table does not change size when the frame is resized.
You need to add constrains to tell the layout what to do with more space. In your SSCCE add these items:
c.fill = GridBagConstraints.BOTH;
c.weightx = 1;
c.weighty = 0;
import java.awt.*;
import javax.swing.*;
public class Test
{
public static void main(String args[]) throws Exception
{
JPanel panel = new JPanel( new GridBagLayout() );
JTable table = new JTable(5, 5);
GridBagConstraints gbc = new GridBagConstraints();
gbc.weightx = 1.0;
gbc.fill = GridBagConstraints.HORIZONTAL;
panel.add(table, gbc);
JFrame frame = new JFrame();
frame.add(panel, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
}
If you need more help post a SSCCE that demonstrates the problem.
c is a GridBagConstraint or something along those lines, I imagine? The very simplest thing to do would be to set the LayoutManager of the JPanel to a BorderLayout, then just add with the constraint BorderLayout.CENTER .
hmmm
Alex Bliskovsky wrote panel.add(qdbs, c);
that's wrong, not, never do that, you are forgot wrap you JTable to the ScrollPane and then you can play with some of LayoutManagers, for related examples for LayoutManagers check GridBagConstraints for GrigBagLayout
The following frame will correctly resize the table when the frame is resized.
public class Sandbox {
public static void main(String[] args) {
new TestFrame();
}
public static class TestFrame extends JFrame {
public TestFrame() {
this.setTitle("SSCCE");
JPanel panel = new JPanel();
panel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.insets = new Insets(10, 10, 10, 10);
c.fill = GridBagConstraints.BOTH;
c.weightx = 1;
c.weighty = 1;
JTable testTable = new JTable(10, 2);
panel.add(testTable, c);
this.add(panel);
this.pack();
this.setVisible(true);
}
}
}
Perhaps with:
GridBagConstraints.fill = GridBagContraints.BOTH;
Related
I am having issue where my JPanel is not setting up the size. I am not sure if is something to do with my JTab or JFrame. I am using GridBagLayout layout management. And for some reason are not able to set the size.
Here is a dummy code, following the same logic to my original source code:
FirstPanel.java
import javax.swing.*;
import java.awt.*;
public class FirstPanel extends JPanel {
private JLabel label1 = new JLabel("Label 1");
private JTextField textField1 = new JTextField();
private GridBagConstraints c = new GridBagConstraints();
public FirstPanel() {
//Size is not overriding
Dimension size = getPreferredSize();
size.width = 100;
setPreferredSize(size);
setBorder(BorderFactory.createTitleBorder("Border Title");
setLayout(new GridBagLayout());
addComponents();
}
private void addComponents() {
c.gridx = 0;
c.gridy = 0;
c.anchor = GridBagConstraints.NORTHWEST;
c.insets = new Insets(5, 0, 0, 0);
add(label1, c);
c.gridx = 1;
add(textField1, c);
c.weightx = 1;
c.weighty = 1;
add(new JLabel(""), c);
}
}
MainPanel.java
import javax.swing.*;
import java.awt.*;
public class MainPanel {
private JFrame frame = new JFrame("App");
private JPanel panel1 = new JPanel(new GridBagLayout());
private GridBagConstraints c = new GridBagConstraints();
private JTabbedPane tabPane = new JTabbedPane();
public MainPanel() {
addComponents();
frame.add(tabPane);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 350);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
}
private void addComponents() {
tabPane.addTab("Tab 1", new FirstPanel());
}
}
Main.java
public class Main {
public static void main(String[] args) {
new MainPanel();
}
}
Or at least have two JPanels,
Exactly.
Frist you create a main panel using a BorderLayout that you add to the tabbed pane.
Then you have a second panel for your labels and text fields (using whatever layout manager you want). Then you add this panel to the BorderLayout.LINE_START.
Then you add your scrollpane containing the JTable to the BorderLayout.CENTER of the main panel.
Read the tutorial on Layout Manager. Nest panels with different layout managers as required.
want to have JTable taking 50% of the other side.
Picking a random number like 50% is not the way to design a GUI. What happens if the frame is made smaller/larger. What happens to the space? Design the layout with flexibility in mind, just like your browser window is designed. There are always fixed areas where the size is determined by the components added and there is a flexible area that grows/shrinks as desired.
I'm trying to use GridBagLayout but the GridBagConstraints objects doesn't show any effect. I want a button to fill the horizontal space. Any Ideas?
static class Five extends JFrame {
public Five() {
setSize(300, 400);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.fill = GridBagConstraints.HORIZONTAL;
JButton button = new JButton("Long-Named Button 4");
add(button, c);
setVisible(true);
}
This works, details in comments:
import java.awt.*;
import javax.swing.*;
public class Five extends JFrame {
public Five() {
setSize(300, 400);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// best to do all important stuff in a panel added to the frame
JPanel gui = new JPanel(new GridBagLayout());
setContentPane(gui);
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1d; // fixes the problem
JButton button = new JButton("Long-Named Button 4");
add(button, c);
pack(); // should always be done after all components are added
setVisible(true);
}
public static void main(String[] args) {
Runnable r = new Runnable() {
#Override
public void run() {
new Five();
}
};
SwingUtilities.invokeLater(r);
}
}
Further tips:
There is no good case for extending JFrame in this case, just do the relevant additions etc. to an instance of a standard frame.
To make the button larger, set a large icon, large insets, or large font. To make the frame bigger, add an EmptyBorder around the gui panel.
I am a beginner in Java Swing and I am trying to put a multiple JPanels in a JScrollPanel. The matter is, the JSCrollPannel (named jp in the code) should not fill all the JFrame but it does even if I fix a size with setSize() and a maximal size with setMaximalSize(). What is the trouble? How can I make the JSCrollPane smaller than the JFrame?
package GUI;
import java.awt.*;
import javax.swing.*;
public class MultiPanels {
private JScrollPane getContent() {
Dimension d = new Dimension(300,200);
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints gbc= new GridBagConstraints();
gbc.weightx = 1.0;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridwidth = GridBagConstraints.REMAINDER;
panel.add(getPanel(d, 6, Color.red), gbc);
panel.add(getPanel(d, 4, Color.green.darker()), gbc);
panel.add(getPanel(d, 4, Color.orange), gbc);
panel.add(getPanel(d, 12, Color.blue), gbc);
panel.add(getEmptyPanel(d), gbc);
return new JScrollPane(panel);
}
private JScrollPane getPanel(Dimension d, int rows, Color color) {
JPanel panel = new JPanel(new GridBagLayout());
panel.setBackground(color);
GridBagConstraints gbc= new GridBagConstraints();
gbc.insets = new Insets(10,5,10,5);
gbc.weightx = 1.0;
for(int i = 0, j = 1; i < rows; i++) {
gbc.gridwidth = GridBagConstraints.RELATIVE;
panel.add(new JButton(String.valueOf(j++)), gbc);
gbc.gridwidth = GridBagConstraints.REMAINDER;
panel.add(new JButton(String.valueOf(j++)), gbc);
}
JScrollPane scrollPane = new JScrollPane(panel);
scrollPane.setPreferredSize(d);
return scrollPane;
}
private JScrollPane getEmptyPanel(Dimension d) {
JPanel panel = new JPanel() {
protected void paintComponent(Graphics g) {
int w = getWidth();
int h = getHeight();
GradientPaint gp = new GradientPaint(0,0,Color.red,
0,h,Color.cyan);
((Graphics2D)g).setPaint(gp);
g.fillRect(0,0,w,h);
}
};
panel.setPreferredSize(new Dimension(300,400));
JScrollPane scrollPane = new JScrollPane(panel);
scrollPane.setPreferredSize(d);
return scrollPane;
}
public static void main(String[] args) {
JFrame f = new JFrame();
JScrollPane jp = new MultiPanels().getContent();
jp.setSize(new Dimension(200, 200));
jp.setMaximumSize(new Dimension(200,200));
jp.setPreferredSize(new Dimension(200,200));
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(jp);
f.setSize(400,400);
f.setLocation(200,200);
f.setResizable(false);
f.setVisible(true);
}
}
Any time things don't size or arrange correctly, you have to look into Layouts.
Generally, spend more time on:
http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html
To be specific, the default layout of a JPanel and JFrame is BorderLayout which is a very simple layout manager indeed. When you add to a component managed by BorderLayout without saying where, it is automatically added to the center and fills to use all available space:
http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html#border
It is possible to use "none" (Absolute Positioning) as the layout, but this is almost always a bad idea and you want to think about what you really want to do with the rest of the space in the JFrame: perhaps by letting new child components, with their own size demands, take up some of the space that the main panel is now swallowing up.
I've seen other posts on this subject, but the solutions they found do not apply to me. I am setting a weighted value and using the c.fill = GridBagConstraints.BOTH constraints as well.
I'm including the whole GUI code I have, just in case my mistake is coming form something other than the GridBagLayout.
I want the scrollable text block on the right to expand the remaining space within the GUI and I have set all the variables that should be attributed to that and yet it still isn't working. What am I doing wrong?
My result:
import java.awt.*;
import javax.swing.*;
public class TestCode extends JFrame {
JTextArea textArea = new JTextArea ();
JComboBox <String> typeComboBox;
JTextField searchField;
JTextField fileField;
public TestCode(){
setTitle ("GUI Test");
setSize (600, 300);
setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
setVisible (true);
JScrollPane scrollPane = new JScrollPane(textArea);
JButton readButton = new JButton("Read File");
JButton displayButton = new JButton("Display");
JButton searchButton = new JButton("Search");
searchField = new JTextField(10);
fileField = new JTextField(15);
typeComboBox = new JComboBox <String> ();
typeComboBox.addItem("Index");
typeComboBox.addItem("Type");
typeComboBox.addItem("Name");
JPanel container = new JPanel();
container.setLayout(new GridBagLayout());
container.setPreferredSize(new Dimension(250, 100));
JPanel filePanel = new JPanel();
filePanel.setLayout(new BoxLayout(filePanel, BoxLayout.Y_AXIS));
filePanel.add(new JLabel("Source file", SwingConstants.LEFT));
JPanel filePanelTop = new JPanel();
filePanelTop.setLayout(new FlowLayout(FlowLayout.LEFT));
filePanelTop.add(fileField);
JPanel filePanelBottom = new JPanel();
filePanelBottom.setLayout(new FlowLayout(FlowLayout.RIGHT));
filePanelBottom.add(readButton);
filePanelBottom.add(displayButton);
filePanel.add(filePanelTop);
filePanel.add(filePanelBottom);
filePanel.setMaximumSize(filePanel.getPreferredSize());
filePanel.setBorder(BorderFactory.createTitledBorder("Import File"));
JPanel searchPanel = new JPanel();
searchPanel.setLayout(new BoxLayout(searchPanel, BoxLayout.Y_AXIS));
searchPanel.add(new JLabel("Search target", SwingConstants.LEFT));
JPanel searchPanelTop = new JPanel();
searchPanelTop.setLayout(new FlowLayout(FlowLayout.LEFT));
searchPanelTop.add(searchField);
searchPanelTop.add(typeComboBox);
searchPanel.add(searchPanelTop);
searchPanel.add(searchButton);
searchPanel.setMaximumSize(searchPanel.getPreferredSize());
searchPanel.setBorder(BorderFactory.createTitledBorder("Search Objects"));
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
container.add(filePanel, c);
c.gridx = 0;
c.gridy = 1;
container.add(searchPanel, c);
c.gridx = 1;
c.gridy = 0;
c.weightx = 1.0;
c.weighty = 1.0;
c.gridwidth = GridBagConstraints.REMAINDER;
c.gridheight = GridBagConstraints.REMAINDER;
c.fill = GridBagConstraints.BOTH;
c.anchor = GridBagConstraints.NORTHWEST;
container.add(scrollPane, c);
add(container, BorderLayout.WEST);
validate();
} // end method toString
public static void main(String[] args){
TestCode run = new TestCode();
}
} // end class Treasure
//add(container, BorderLayout.WEST);
add(container);
The West contrains the components to their preferred width. The default is the CENTER which allows components to expand to fill the space available.
Also, the main structure of you code is wrong. You should be adding all the component to the frame first and then invoke:
frame.pack();
frame.setVisible(true);
Then there is no need for the validate().
I need to display a single component within a JPanel, and I want to keep that component in bottom right corner at all times. I tried to do it with GridBagLayout:
val infoArea = new TextArea {
text = "Hello!"
border = Swing.EmptyBorder(30)
background = Color.RED
editable = false
}
val p = new JPanel
p.setLayout(new GridBagLayout)
val c = new GridBagConstraints
c.gridx = 0
c.gridy = 0
c.anchor = GridBagConstraints.LAST_LINE_END
p.add(infoArea.peer,c)
val f = new JFrame
f.setContentPane(p)
f.setVisible(true)
But the text area is at the center for some reason:
What am I doing wrong here?
For example:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.*;
public class LayoutDemo {
private static void createAndShowGui() {
JLabel label = new JLabel("Hello");
label.setOpaque(true);
label.setBackground(Color.red);
JPanel bottomPanel = new JPanel(new BorderLayout());
bottomPanel.add(label, BorderLayout.LINE_END);
JPanel mainPanel = new JPanel(new BorderLayout());
mainPanel.add(bottomPanel, BorderLayout.PAGE_END);
mainPanel.setPreferredSize(new Dimension(400, 400));
JFrame frame = new JFrame("LayoutDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frame.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
frame.add(Box.createGlue(), gbc);
final JTextArea textArea = new JTextArea("SE");
textArea.setPreferredSize(new Dimension(50, 50));
textArea.setOpaque(true);
textArea.setBackground(Color.RED);
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 1;
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0.0;
gbc.weighty = 0.0;
frame.add(textArea, gbc);
frame.setSize(640, 480);
frame.setVisible(true);
...if you realy want to use GridBagLayout
you have to put a dummy (use Box.createGlue() to make a dummy component) component on gridx = 0 and gridy = 0 and the component you want to put at the bottom right at gridx = 1, gridy = 1.like this