I would like to add a JScrollpane into an existing Jpanel, I created a for loop for adding some buttons, but are not displayed. This is the code, but nothing is displayed inside the Jpanel
public class Main extends javax.swing.JFrame {
public Main() {
initComponents();
//EXISTING JPANEL
gridPanel = new JPanel(new GridLayout(0, 1));
JPanel borderLayoutPanel = new JPanel(new BorderLayout());
borderLayoutPanel.add(gridPanel, BorderLayout.PAGE_START);
JScrollPane scrollPane = new JScrollPane(borderLayoutPanel);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
add(scrollPane);
Avvio();
}
private void Avvio() {
JPanel pane = new JPanel(new GridBagLayout());
pane.setBorder(BorderFactory.createLineBorder(Color.BLUE));
for (int i = 0; i < 10; i++) {
JButton button;
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.anchor = GridBagConstraints.PAGE_START;
button = new JButton("Button 1");
c.weightx = 0.5;
c.gridx = 0;
c.gridy = 0;
pane.add(button, c);
button = new JButton("Button 2");
c.gridx = 0;
c.gridy = 1;
pane.add(button, c);
button = new JButton("Button 3");
c.gridx = 1;
c.gridy = 1;
pane.add(button, c);
}
}
Related
I'm learning java swing and this is very confused to me. The quit button doesn't display. However, if I move the code part of textArea after the two parts of buttons, it will display correctly. So why?
package exercise1;
import javax.swing.*;
import java.awt.*;
public class ChatClient {
private JTextArea textArea;
private JTextField textField;
private JButton btnSend;
private JButton btnQuit;
private JFrame frame;
private JPanel panel;
private JScrollPane scrollPane;
private void launchFrame() {
panel = new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
textArea = new JTextArea(10, 50);
scrollPane = new JScrollPane(textArea);
c.gridx = 0;
c.gridy = 0;
c.gridheight = 3;
panel.add(scrollPane, c);
btnSend = new JButton("Send");
c.gridx = 1;
c.gridy = 0;
c.anchor = GridBagConstraints.NORTH;
panel.add(btnSend, c);
btnQuit = new JButton("Quit");
c.gridx = 1;
c.gridy = 1;
c.anchor = GridBagConstraints.NORTH;
panel.add(btnQuit, c);
}
protected ChatClient() {
frame = new JFrame("Chat Room");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
launchFrame();
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
ChatClient client = new ChatClient();
}
}
Simple: You forgot to reset c.gridheight = 1; after adding the JScrollPane. Without doing this, the send button will overlie the quit button.
private void launchFrame() {
panel = new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL; // ** This is also worthwhile **
textArea = new JTextArea(10, 50);
scrollPane = new JScrollPane(textArea);
c.gridx = 0;
c.gridy = 0;
c.gridheight = 3;
panel.add(scrollPane, c);
btnSend = new JButton("Send");
c.gridx = 1;
c.gridy = 0;
c.gridheight = 1; // ********* ADD THIS *********
c.anchor = GridBagConstraints.NORTH;
panel.add(btnSend, c);
btnQuit = new JButton("Quit");
c.gridx = 1;
c.gridy = 1;
c.anchor = GridBagConstraints.NORTH;
panel.add(btnQuit, c);
}
I am using GridBagLayout to design the interface. The interface has one JTabbedPane set at north and fill both directions as I resize, and just below the JTabbedPane there are two JButtons.
What I want to achieve is putting these two buttons at east with using only GridBagLayout capabilities (without introducing an extra JPanel), but I failed to do so.
|-[tab]--------------------------|
|---------------------------------|
|---------------------------------|
|---------------------------------|
|---------------------------------|
|-------------[button][button]|
When I set the layout constraint for both buttons to WEST (not EAST). Both go west correctly!
c.anchor = GridBagConstraints.WEST;
But when I set the layout constraint for both buttons to east
c.anchor = GridBagConstraints.EAST;
One of them go to east and the other go to west!
To solve this issue I added a JPanel which hold both buttons and added this JPanel into the interface, and set its layout constraint to c.anchor = GridBagConstraints.EAST;. It works well.
But is it possible to build the same GridBagLayout interface without using an extra JPanel as a container?
The following two classes are in SSCCE format; the first one show the problem GridBagTest, and the other show the solution GridBagTest_solved that make use of extra JPanel
Problem class:
import javax.swing.*;
import java.awt.*;
public class GridBagTest extends JPanel {
JFrame frame;
JTabbedPane tabbedPane;
JPanel panel_tab;
JButton btn_previous;
JButton btn_next;
private void create_and_layout() {
this.setLayout(new GridBagLayout());
tabbedPane = new JTabbedPane() {
#Override
public Dimension getPreferredSize() {
return new Dimension(300, 150);
}
};
panel_tab = new JPanel();
tabbedPane.addTab("Tab 1", panel_tab);
btn_previous = new JButton("previous");
btn_next = new JButton(" next ");
GridBagConstraints c;
c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.weightx = 1;
c.gridwidth = 2;
c.weighty = 1;
c.fill = GridBagConstraints.BOTH;
c.anchor = GridBagConstraints.NORTH;
this.add(tabbedPane, c);
c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 1;
c.anchor = GridBagConstraints.EAST;
c.insets = new Insets(2, 0, 2, 2);
this.add(btn_previous, c);
c = new GridBagConstraints();
c.gridx = 1;
c.gridy = 1;
c.anchor = GridBagConstraints.EAST;
c.insets = new Insets(2, 0, 2, 2);
this.add(btn_next, c);
}
private void initGUI() {
create_and_layout();
frame = new JFrame("GridBagTest");
frame.getContentPane().add(this);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new GridBagTest()::initGUI);
}
}
Solution class:
import javax.swing.*;
import java.awt.*;
public class GridBagTest_solved extends JPanel {
JFrame frame;
JTabbedPane tabbedPane;
JPanel panel_tab;
JPanel panel_buttons;
JButton btn_previous;
JButton btn_next;
private void create_and_layout() {
this.setLayout(new GridBagLayout());
tabbedPane = new JTabbedPane() {
#Override
public Dimension getPreferredSize() {
return new Dimension(300, 150);
}
};
panel_tab = new JPanel();
tabbedPane.addTab("Tab 1", panel_tab);
panel_buttons = new JPanel(new GridBagLayout());
btn_previous = new JButton("previous");
btn_next = new JButton(" next ");
GridBagConstraints c;
// Adding buttons to panel_buttons
c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.insets = new Insets(2, 0, 2, 2);
panel_buttons.add(btn_previous, c);
c = new GridBagConstraints();
c.gridx = 1;
c.gridy = 0;
c.insets = new Insets(2, 0, 2, 2);
panel_buttons.add(btn_next, c);
// Adding tabbedPane & panel_buttons to this (GridBagTest_solved)
c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.weightx = 1;
c.weighty = 1;
c.fill = GridBagConstraints.BOTH;
c.anchor = GridBagConstraints.NORTH;
this.add(tabbedPane, c);
c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 1;
c.anchor = GridBagConstraints.EAST;
this.add(panel_buttons, c);
}
private void initGUI() {
create_and_layout();
frame = new JFrame("GridBagTest_solved");
frame.getContentPane().add(this);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new GridBagTest_solved()::initGUI);
}
}
If you only have the three components - the JTabbedPane and two JButtons, you should consider using a simpler layout than GridBag. Just use a BorderLayout for the main panel, placing the JTabbedPane in CENTER, and a JPanel in SOUTH that has a FlowLayout with alignment of TRAILING, then just add the two buttons to that JPanel.
I have created a layout for a basic text editor, I would like the top bar to have the buttons alligned to the left, the top bar is a JPanel and it is using the FlowLayout manager. It is inside of a grid using the GridBag layout manager. Any suggestions?
import java.awt.*;
import javax.swing.*;
public class GridTest {
private static JButton firstButton, secondButton, thirdButton;
private static JPanel panel, sidebar, infoPanel;
private static JTextArea textArea;
public static void addComponentsToPane(Container container) {
container.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
firstButton = new JButton("Button 1");
secondButton = new JButton("Button 2");
thirdButton = new JButton("Button 3");
panel = new JPanel(new FlowLayout());
sidebar = new JPanel(new FlowLayout());
infoPanel = new JPanel(new FlowLayout());
textArea = new JTextArea("This is some generic text!");
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 0;
c.weighty = 0;
c.weightx = 1;
c.gridx = 0;
c.gridwidth = 3;
c.gridy = 0;
c.anchor = GridBagConstraints.LINE_START;
container.add(panel, c);
panel.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
panel.setBorder(BorderFactory.createLineBorder(Color.black));
panel.add(firstButton);
panel.add(secondButton);
panel.add(thirdButton);
c.fill = GridBagConstraints.BOTH;
c.ipady = 300;
c.ipadx = 100;
c.weighty = 1;
c.weightx = 0;
c.gridx = 0;
c.gridheight = 2;
c.gridwidth = 1;
c.gridy = 1;
container.add(sidebar, c);
sidebar.setBorder(BorderFactory.createLineBorder(Color.black));
c.fill = GridBagConstraints.BOTH;
c.ipady = 40;
c.weightx = 1;
c.weighty = 1;
c.gridwidth = 2;
c.gridheight = 1;
c.gridx = 1;
c.gridy = 1;
container.add(textArea, c);
textArea.setFont(new Font("Serif", Font.ITALIC, 16));
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 20;
c.weighty = 0;
c.weightx = 0;
c.anchor = GridBagConstraints.PAGE_END;
c.gridx = 1;
c.gridwidth = 2;
c.gridy = 2;
container.add(infoPanel, c);
infoPanel.setBorder(BorderFactory.createLineBorder(Color.black));
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("Grid test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addComponentsToPane(frame.getContentPane());
frame.setSize(800,600);
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
Consider using a JToolBar instead of a JPanel, as it has it's own layout manager, which, basically, does this any way.
Images from following tutorial...
Check out How to use Tool Bars for more details
One way: Change your FlowLayout to one that prefers to place its components on the left:
panel = new JPanel(new FlowLayout(FlowLayout.LEADING));
How to set the size of jbutton in gridlayout? otherwise the button size have lot of width and its not listening setSize or setBounds or setPreferedSize.
addBut = new JButton("Add");
addBut.addActionListener(this);
deleteBut = new JButton("Delete");
deleteBut.addActionListener(this);
selectionPanel = new JPanel();
selectionPanel.setLayout(new GridLayout(2,2));
TitledBorder selectionBorder = new TitledBorder("Options");
selectionBorder.setTitleColor(Color.BLUE);
selectionPanel.setBorder(selectionBorder);
selectionPanel.add(new JLabel("Department Name"));
selectionPanel.add(new JTextField(deptName));
selectionPanel.add(addBut);
selectionPanel.add(deleteBut);
selectionPanel.setPreferredSize(new Dimension(900,100));
I believe setting GridLayout(2,2) will override size changes made to the panels. To be more precise, use GridBagConStraints;
private JTextField field1 = new JTextField();
private JButton addBtn = new JButton("Save: ");
public void addComponents(Container pane) {
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
// Components
c.gridwidth = 1;
c.weightx = .01;
c.weighty = .2;
c.gridx = 0;
c.gridy = 1;
pane.add(field1, c);
c.gridwidth = 1;
c.weightx = .01;
c.weighty = .2;
c.gridx = 0;
c.gridy = 1;
pane.add(addBtn, c);
}
public MainView() {
//Create and set up the window.
JFrame frame = new JFrame("NAME");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Set up the content pane.
addComponents(frame.getContentPane());
//Display the window.
frame.pack();
frame.setVisible(true);
frame.setResizable(false);
frame.setSize(400, 125);
frame.setLocation(400, 300);
}
I have the following simple code and I don't know how to modify it so as to have 3 separate panels to switch to, one for each button:
package TouristLocations;
import javax.swing.*;
import java.awt.*;
public class buildApp extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
public static void main(String[] args){
JFrame frame = new JFrame("Test");
frame.setSize(400,500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
JLabel title = new JLabel("Locations");
title.setFont(new Font("Serif", Font.BOLD, 40));
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 3;
frame.add(title, c);
JButton b1 = new JButton("View Locations");
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 1;
frame.add(b1, c);
JButton b2 = new JButton("Insert Locations");
c.gridx = 1;
c.gridy = 1;
frame.add(b2, c);
JButton b3 = new JButton("Help");
c.gridx = 2;
c.gridy = 1;
frame.add(b3, c);
TextArea text1 = new TextArea(15,40);
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 3;
frame.add(text1, c);
frame.pack();
}
}
thank you
Sounds like you should consider using JTabbedPane.
In addition to How to Use Tabbed Panes, you may want to look at CardLayout, mentioned here and here.
You should create a main container:
JPanel mainContainer = new JPanel();
//creation of each child
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
... so each button must add those panels into the main container and resize new panel size, something like this:
//for button1:
mainContainer.add(panel1);
panel1.setSize(mainContainer.getSize());
... for button2 action, you must follow the same way above.