I am trying to resize the JPanels but there is a space under it . Here is a link to show :
And this is the code :
import java.awt.*;
import javax.swing.*;
public class Ex1 extends JFrame{
private JTextArea textarea = new JTextArea ();
private JTextField field = new JTextField ();``
private JButton buton = new JButton ("Trimite");
public Ex1(){
JPanel panel = new JPanel (new BorderLayout(2,2));
JPanel panel1 = new JPanel (new BorderLayout(2,2));
JPanel panel2 = new JPanel (new BorderLayout(2,2));
JLabel label1 = new JLabel ("Mesaje");
JLabel label2 = new JLabel ("Scrieti un mesaj");
panel1.setPreferredSize(new Dimension(350,100));
panel2.setPreferredSize(new Dimension(350,25));
panel1.add(label1, BorderLayout.NORTH);
panel1.add(textarea, BorderLayout.CENTER);
panel2.add(label2, BorderLayout.WEST);
panel2.add(field, BorderLayout.CENTER);
panel2.add(buton, BorderLayout.EAST);
setLayout(new GridLayout(2,1,1,1));
panel.add(panel1, BorderLayout.NORTH);
panel.add(panel2, BorderLayout.CENTER);
add(panel);
}
public static void main(String[] args) {
JFrame frame = new Ex1();
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
You are setting a layout for a frame to GridLayout in which all components are given equal size. You have two rows, add(panel) adds the panel to the first row of the grid. The second row is left empty. See How to Use GridLayout.
Comment out setLayout(new GridLayout(2,1,1,1)); and the extra space should go away. When you comment this line the layout of frame's content pane will be BorderLayout. The default layout of the JFrame is BorderLayout. So add(panel); will add the panel to the center of the frame's content pane. As a result the panel should occupy all the available space.
As a side note, avoid setPreferredSize(), usually it is not necessary, see Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing for details.
You can specify the number of rows and columns for a text area and wrap it in the scroll pane, ie:
textArea = new JTextArea(5, 20);
JScrollPane scrollPane = new JScrollPane(textArea);
For more details see How to Use Text Areas
EDIT: example of getPreferredSize()
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.*;
public class Ex1 extends JPanel{
private JTextArea textarea = new JTextArea ();
private JTextField field = new JTextField ();
private JButton buton = new JButton ("Trimite");
public Ex1() {
setLayout(new BorderLayout());
JPanel panel1 = new JPanel (new BorderLayout(2,2));
JPanel panel2 = new JPanel (new BorderLayout(2,2));
JLabel label1 = new JLabel ("Mesaje");
JLabel label2 = new JLabel ("Scrieti un mesaj");
panel1.add(label1, BorderLayout.NORTH);
panel1.add(new JScrollPane(textarea), BorderLayout.CENTER);
panel2.add(label2, BorderLayout.WEST);
panel2.add(field, BorderLayout.CENTER);
panel2.add(buton, BorderLayout.EAST);
add(panel1, BorderLayout.CENTER);
add(panel2, BorderLayout.SOUTH);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(350, 300);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
Ex1 panel = new Ex1();
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
});
}
}
You need to resize the JFrame not the JPanel. Try:
this.setPreferredSize(new Dimension(350, 25);// in Ex1
Or in your main method:
frame.setPreferredSize(new Dimension(350, 25);
Related
I need the following UI on JFrame. Two Jlabel Vertically Left aligned. Two button horizontally below the Jlabel. I tried below code but it is coming in one row.
Label should be left and vertically aligned.
Button should cover all the width of Jframe.
import javax.swing.*;
import java.awt.*;
public class CustomPanel {
private JFrame frame = new JFrame();
private JPanel basePanel= new JPanel();
public static void main(String []args){
CustomPanel cp= new CustomPanel();
cp.showUI();
}
private void addui(){
JPanel labelPanel = new JPanel();
labelPanel.setLayout(new GridBagLayout());
JLabel label11 = new JLabel("I am here to test");
JLabel label12 = new JLabel("I am here to test row");
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.BOTH;
labelPanel.add(label11, gbc);
gbc.gridy++;
gbc.gridwidth = 2;
labelPanel.add(label12, gbc);
basePanel.add(labelPanel);
/////////////// button panel//////////
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(0, 2, 5, 5));
panel.add(new JButton("Click me"));
panel.add(new JButton("Click me22"));
basePanel.add(panel);
}
private void showUI(){
JFrame.setDefaultLookAndFeelDecorated(true);
addui();
frame.setAlwaysOnTop(true);
frame.setType(Window.Type.UTILITY);
frame.setResizable(true);
frame.getContentPane().setLayout(new BorderLayout());
JScrollPane scrollPane = new JScrollPane(basePanel);
scrollPane.setPreferredSize(new Dimension(400, 250));
frame.getContentPane().add(scrollPane);
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.setSize(500, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
Oracle has a helpful tutorial, Creating a GUI With Swing. Skip the Learning Swing with the NetBeans IDE section. Pay particular attention to the Laying Out Components Within a Container section.
When creating a Swing GUI, you can break up a complex JPanel layout into more than one simpler JPanels. I created three JPanels for this GUI; the main JPanel, the label JPanel, and the button JPanel.
A Swing application must start with a call to the SwingUtilities invokeLater method. This method ensures that the Swing components are created and executed on the Event Dispatch Thread.
I created the JFrame and the three JPanels in separate methods. This allows me to focus on one part of the GUI at a time and makes the code much easier to read and follow. This also allows me to experiment with different Swing layout managers to see which one is appropriate for the GUI.
Here's the complete runnable code.
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class CustomPanel implements Runnable {
public static void main(String[] args) {
SwingUtilities.invokeLater(new CustomPanel());
}
#Override
public void run() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(createMainPanel(), BorderLayout.CENTER);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
private JPanel createMainPanel() {
JPanel panel = new JPanel(new BorderLayout());
panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));
panel.add(createLabelPanel(), BorderLayout.NORTH);
panel.add(createButtonPanel(), BorderLayout.SOUTH);
return panel;
}
private JPanel createLabelPanel() {
JPanel panel = new JPanel(new BorderLayout());
panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));
JLabel label11 = new JLabel("I am here to test");
panel.add(label11, BorderLayout.NORTH);
JLabel label12 = new JLabel("I am here to test row");
panel.add(label12, BorderLayout.SOUTH);
return panel;
}
private JPanel createButtonPanel() {
JPanel panel = new JPanel(new GridLayout(0, 2, 5, 5));
panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));
JButton button = new JButton("Click me");
panel.add(button);
button = new JButton("Click me22");
panel.add(button);
return panel;
}
}
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());
I am trying to display small panels in a Table form and added to a ScrollPane . but the scrollpane never scrolls
is it the layout or the size of the container ? or what ?!
Here is an example of what i wanna do:
public class ScrollPanePanels extends JFrame{
JPanel container = new JPanel(null);
JScrollPane scroll = new JScrollPane(container);
public ScrollPanePanels()
{
super();
setLayout(null);
setSize(600,600);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel Panel1 = new JPanel();
JPanel Panel2= new JPanel();
JPanel Panel3 = new JPanel();
Panel1.setBounds(0,0,500,250);
Panel2.setBounds(0,250,500,250);
Panel3.setBounds(0,500,500,250);
Panel1.setBackground(Color.BLUE);
Panel2.setBackground(Color.RED);
Panel3.setBackground(Color.GREEN);
scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scroll.setBounds(50,50,500,500);
container.setSize(500,750);
container.add(Panel1);
container.add(Panel2);
container.add(Panel3);
add(scroll);
setVisible(true);
}
public static void main(String [] args)
{
ScrollPanePanels s = new ScrollPanePanels();
}
}
I am simply trying to add a tabbed pane with 5 tabs onto a panel, although only the final tab (tab e) is being shown.
I am obviously doing something fundamentally wrong here, I have tried changing the layout manager of the Panel the tabbed pane is being added to but I don't think this is the problem. Any adivce would be helpful thanks!
Main Class Code:
public static void main(String[] args) {
JFrame frame = new JFrame("Data Structures Program");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600, 600);
GraphicPanel G = new GraphicPanel();
frame.add(G.getPanel());
frame.setVisible(true);
}
Graphics Class
public class GraphicPanel {
public JPanel topPanel;
public GraphicPanel() {
JPanel Panel = new JPanel();
Panel.setLayout(new GridLayout(1, 1));
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.addTab("a", Panel);
tabbedPane.addTab("b", Panel);
tabbedPane.addTab("c", Panel);
tabbedPane.addTab("d", Panel );
tabbedPane.addTab("e", Panel );
topPanel = new JPanel();
topPanel.setLayout(new GridLayout(1, 1));
topPanel.add(tabbedPane);
}
public JPanel getPanel(){
return topPanel;
}
}
you must creates new instance of JPanel if you want to show in JTabbedPane
try this code:
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.addTab("a", new Panel());
tabbedPane.addTab("b", new Panel());
tabbedPane.addTab("c", new Panel());
tabbedPane.addTab("d", new Panel());
tabbedPane.addTab("e", new Panel());