If you run the small sample below you'll see a border around the center region. I'm not sure why this border is showing.
It happens when a JTable is in a JScrollPane. I tried various things to remove it but so far no luck. A JTable without the JScrollPane shows no border.
See sample below. TIA.
public class TestScrollPane extends JFrame {
public static void main(String[] args) {
JFrame frame = new TestScrollPane();
JPanel panel = new JPanel();
JTable table = new JTable();
panel.setLayout(new BorderLayout());
panel.add(new JLabel("NORTH"), BorderLayout.NORTH);
panel.add(new JLabel("SOUTH"), BorderLayout.SOUTH);
JScrollPane sp = new JScrollPane(table);
// None of these have any effect
sp.setBorder(null);
sp.getInsets().set(0, 0, 0, 0);
sp.setViewportBorder(null);
sp.getViewport().setBorder(null);
sp.getViewport().getInsets().set(0, 0, 0, 0);
sp.getViewport().setOpaque(true);
panel.add(sp, BorderLayout.CENTER);
// Adding the table alone shows no border
// panel.add(table, BorderLayout.CENTER);
frame.add(panel);
frame.setVisible(true);
}
public TestScrollPane() throws HeadlessException {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setMinimumSize(new Dimension(100, 100));
}
}
Use BorderFactory.createEmptyBorder() instead of null...
by using:
sp.setBorder(createEmptyBorder());
it works.
Your main method becomes:
public static void main(String[] args) {
JFrame frame = new TestScrollPane();
JPanel panel = new JPanel();
JTable table = new JTable();
panel.setLayout(new BorderLayout());
panel.add(new JLabel("NORTH"), BorderLayout.NORTH);
panel.add(new JLabel("SOUTH"), BorderLayout.SOUTH);
JScrollPane sp = new JScrollPane(table);
sp.setBorder(BorderFactory.createEmptyBorder());
panel.add(sp, BorderLayout.CENTER);
frame.add(panel);
frame.setVisible(true);
}
Interestingly the border disappears when you remove this line:
sp.setBorder(null);
I was looking for the answer for the same question but above answers could not do... so I found a better answer:
JScrollPane jsp = new JScrollPane();
//ur other codes
jsp.setViewportBorder(null);
For JTable table.setIntercellSpacing(new Dimension(0, 0)) works.
I think the proper fix is to set the border on the viewportView to 'null'.
To remove the border from all parts of the JScrollPane including the vertical and horizontal bar the following code works
JScrollPane jsp = new JScrollPane();
jsp.getVerticalScrollBar().setBorder(null);
jsp.getHorizontalScrollBar().setBorder(null);
jsp.setBorder(null);
Related
I'm aware there are several questions with the same title, and I've tried their answers but to no avail.
I'm getting the following result with my code:
It does not scroll as it should, and there's this empty little space to the right.
Here is the main code for the frame, mainpanel, list panel and the buttons panel that are inside the mainpanel.
public Tester2() {
JPanel mainPanel = new JPanel(); /////// MAIN PANEL
mainPanel.setLayout(new BorderLayout());
mainPanel.setPreferredSize(new Dimension(200, 400));
JPanel upperListPnl = new JPanel(); ////// LIST PANEL
upperPnlSetup(upperListPnl);
JPanel lowerBtnsPnl = new JPanel(); ///// BUTTONS PANEL
lowerBtnsPnl.setLayout(new BorderLayout());
JButton testButton = new JButton("Test the list");
testButton.addActionListener(e -> {
exampleModel.addElement("List has been tested");
updateExampleData();
});
lowerBtnsPnl.add(testButton);
mainPanel.add(upperListPnl, BorderLayout.CENTER);
mainPanel.add(lowerBtnsPnl, BorderLayout.SOUTH);
JFrame frame = new JFrame();
frame.add(mainPanel);
frame.setVisible(true);
frame.pack();
frame.setLocationRelativeTo(null);
}
Here is the code for the JList and the JScrollpane (upper panel):
public void upperPnlSetup(JPanel panel) {
panel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
exampleList = new JList<>(exampleModel);
JScrollPane jsp = new JScrollPane(exampleList, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
c.fill = GridBagConstraints.BOTH;
c.weighty = 1;
c.weightx = 0.75;
panel.add(exampleList, c);
c.weightx = 0.25;
panel.add(jsp, c);
}
And then the JList and model list as well as the data updating method:
private JList<String> exampleList;
private DefaultListModel<String> exampleModel = new DefaultListModel<>();
public void updateExampleData() {
exampleList.setModel(exampleModel);
}
I tried a FloatLayout, a BorderLayout, and a GridLayout (0,2 and 0,1) all of which didn't work. Finally, I settled for the GridBagLayout since it's seemingly always used for JLists and/or JScrollpanes, and I played with the GridBagConstraints as well as the positioning of the code but seem to always land on the same problem. I've tried giving the scroll pane a preferredSize, didn't do anything.
Okay so, apparently the problem was that I was adding the list to the panel. Adding it to the scrollpane, then adding the scrollpane to the panel was enough, so commenting out the
panel.add(exampleList, c);`
fixed the whole thing.
I have a Panel which I have made scrollable in my frame.
What I need is to add a button that stays fixed in the lower right corner even when I scroll.
I'm new to Java Swing so would appreciate all and any help that I can get.
mainPanel = new SimulationPanel(); //class SimulationPanel extends JPanel
//making mainPanel scrollable
mainPanel.setPreferredSize(new Dimension(((int)(WIDTH*1.2)), HEIGHT));
JScrollPane scrollPane = new JScrollPane(mainPanel);
scrollPane.setViewportView(mainPanel);
// Settings for JFrame
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
frame = new JFrame("Warehouse Simulator");
frame.setContentPane(scrollPane);
frame.setSize(screenSize.width, screenSize.height);
frame.setResizable(true);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setVisible(true);
I would use nested panels with the outer one be with BorderLayout. Then one with FlowLayout and align FlowLayout.RIGHT and the button inside it.
public class Example extends JFrame {
public Example() {
super("");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
JTextArea textArea = new JTextArea(10000, 0);
JScrollPane scrollPane = new JScrollPane(textArea);
add(scrollPane, BorderLayout.CENTER);
JButton button = new JButton("button");
JPanel panelWithButton = new JPanel(new FlowLayout(FlowLayout.RIGHT));
panelWithButton.add(button);
add(panelWithButton, BorderLayout.PAGE_END);
setLocationByPlatform(true);
pack();
setSize(600, 600);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
new Example().setVisible(true);
});
}
}
Result:
I would go for a BoxLayout. Add another panel (metaPanel) in which your first put your scrollingPanel, and then you add a button. Instead of usgin scrollingPanel as contentPane, you use metaPanel. Example (the example works, but you need to modify it to make the interface look nice):
JPanel mainPanel = new JPanel();
JScrollPane scrollPane = new JScrollPane(mainPanel);
scrollPane.setViewportView(mainPanel);
JPanel metaPanel = new JPanel();
BoxLayout boxlayout = new BoxLayout(metaPanel, BoxLayout.Y_AXIS);
metaPanel.setLayout(boxlayout);
metaPanel.add(scrollPane);
metaPanel.add(new JButton("button"));
// Settings for JFrame
frame = new JFrame("Warehouse Simulator");
frame.setContentPane(metaPanel); // Put metaPanel here
frame.setSize(500, 300);
frame.setResizable(true);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setVisible(true);
I have created a JScrollPane with a RowHeaderView, a ColumnHeaderView and a ViewPortView. I added JPanels in diffrent colors and noticed, that there is one cornor left, on the upper-left where you cant just add a Component. I wanted to ask, how it is possible to add a Component there.
Here a image. The area I mean is green:
And here my Code:
public class Example {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(1000, 800);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
JPanel panel0 = new JPanel();
panel0.setBackground(Color.yellow);
JPanel panel1 = new JPanel();
panel1.setBackground(Color.red);
panel1.setPreferredSize(new Dimension(30, 200));
JPanel panel2 = new JPanel();
panel2.setBackground(Color.blue);
panel2.setPreferredSize(new Dimension(200, 30));
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportView(panel0);
scrollPane.setRowHeaderView(panel1);
scrollPane.setColumnHeaderView(panel2);
scrollPane.setBackground(Color.green);
frame.add(scrollPane);
frame.setVisible(true);
}
}
It's easy. Use the method setCorner
scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, new JButton());
My question is similar to this one (How to get JScrollPanes within a JScrollPane to follow parent's resizing), but that question wasn't clear and the answer there didn't help me..
I have this SSCCE (using MigLayout):
public static final int pref_height = 500;
public static void main(String[] args) {
JPanel innerPanel = new JPanel(new MigLayout());
innerPanel.setBorder(new LineBorder(Color.YELLOW, 5));
for(int i = 0; i < 15; i++) {
JTextArea textArea = new JTextArea();
textArea.setColumns(20);
textArea.setRows(5);
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
JScrollPane jsp = new JScrollPane(textArea);
innerPanel.add(new JLabel("Notes" + i));
innerPanel.add(jsp, "span, grow");
}
JScrollPane jsp = new JScrollPane(innerPanel) {
#Override
public Dimension getPreferredSize() {
setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
Dimension dim = new Dimension(super.getPreferredSize().width + getVerticalScrollBar().getSize().width, pref_height);
setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
return dim;
}
};
jsp.setBorder(new LineBorder(Color.green, 5));
JPanel outerPanel = new JPanel();
outerPanel.setBorder(new LineBorder(Color.RED, 5));
outerPanel.add(jsp);
JFrame frame = new JFrame();
JDesktopPane jdp = new JDesktopPane();
frame.add(jdp);
jdp.setPreferredSize(new Dimension(800, 600));
frame.pack();
JInternalFrame jif = new JInternalFrame("Title", true, true, true, true);
jif.pack();
jif.add(outerPanel);
jdp.add(jif);
jif.pack();
jif.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
I want the JScrollPane to resize whenever the parent JPanel is resized. Basically, I want the green border to line up with the red border. Right now, the green border stays the same size no matter the red border (unless you resize too small).
JPanel outerPanel = new JPanel();
A JPanel uses a FlowLayout by default which always respects the size of the component added to it. As a guess, maybe you can use:
JPanel outerPanel = new JPanel( new BorderLayout() );
A BorderLayout give all the space available to the component added to the panel. By default a JInternalFrame also uses a BorderLayout. So since all the parent components of your scroll pane use a BorderLayout all the space should go to the scroll pane.
When you post a SSCCE you should post code using classes from the JDK that simulates your problem so that everybody can test your SSCCE.
I noticed this did not have an answer that uses the original layout so here is one.
In order to make the JScrollPane resize when the parent JPanel is resized you need to do two things.
1) Set the layout of the panel to grow. This can be using the following code.
new MigLayout("", //Layout Constraints
"grow", //Column Constraints
"grow"); //Row Constraints
2) Set the component to grow. This is as simple as adding an extra argument in the add() function.
add(jsp, "grow");
ExtraIn order to make the JTextArea column grow when you resize the JScrollPane you can change the layout to only make the second column change. For example
new MigLayout("", //Layout Constraints
"[/*Column 1*/][grow /*Column 2*/]", //Column Constraints
""); //Row Constraints
Also, I would recommend you use wrap instead of span to use the next row as span refers using so many columns. For example span 2 //Means use 2 columns for this component. This would mean when you add your jsp to innerPanel it would become
innerPanel.add(jsp, "wrap, grow");
Edited SSSCE
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import net.miginfocom.swing.MigLayout;
public class JSPR extends JFrame {
public static final int pref_height = 500;
public static void main(String[] args) {
JPanel innerPanel = new JPanel(new MigLayout("", "[][grow]", ""));
innerPanel.setBorder(new LineBorder(Color.YELLOW, 5));
for(int i = 0; i < 15; i++) {
JTextArea textArea = new JTextArea();
textArea.setColumns(20);
textArea.setRows(5);
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
JScrollPane jsp = new JScrollPane(textArea);
innerPanel.add(new JLabel("Notes" + i));
innerPanel.add(jsp, "wrap, grow");
}
JScrollPane jsp = new JScrollPane(innerPanel) {
#Override
public Dimension getPreferredSize() {
setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
Dimension dim = new Dimension(super.getPreferredSize().width + getVerticalScrollBar().getSize().width, pref_height);
setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
return dim;
}
};
jsp.setBorder(new LineBorder(Color.green, 5));
JPanel outerPanel = new JPanel(new MigLayout("", "grow", "grow"));
outerPanel.setBorder(new LineBorder(Color.RED, 5));
outerPanel.add(jsp, "grow");
JFrame frame = new JFrame();
JDesktopPane jdp = new JDesktopPane();
frame.add(jdp);
jdp.setPreferredSize(new Dimension(800, 600));
frame.pack();
JInternalFrame jif = new JInternalFrame("Title", true, true, true, true);
jif.pack();
jif.add(outerPanel);
jdp.add(jif);
jif.pack();
jif.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
I am using NetBeans. I turned off the auto-resize of JTable columns. Now it is aligned to the left side of scroll pane. How can I make it centered?
Found the solution. Have to add an extra panel.
public class GUI {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(500, 400);
JButton button = new JButton("Click me");
button.setPreferredSize(new Dimension(200, 40));
JPanel panel = new JPanel();
panel.add(button);
JScrollPane scrollableArea = new JScrollPane(panel);
frame.add(scrollableArea);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
Really a great and unexpected solution. Sometime java really acts weird. Here is the orginal post http://www.velocityreviews.com/forums/t600361-jscrollpane.html