I am using the gridbag layout to create my first application in Java. My code is completed and is located in another class. The problem I am having is being able to control buttons. I have the Jtextfield that outputs text on very first row to the bottom right. I want that Jtextfield to take 3 of the 4 spaces but its only taking the space in the end only. I want to be able to show entry spanning from from 3 of the cells in the top. I reserved one cell to reserve an image of the operator. Also, I set up some text constraints so that it doesn't resize the whole right hand size as output is being shown. But I wanted to keep the right hand side even. Can anyone tell me what I am doing wrong?
public class MyFrame extends JFrame{
static JLabel display;
static JLabel displayOperator;
public static String entry;
public static String repeatEntry;
public static String repeatEntry2;
public static String num1 = "";
public static String num2 = "";
public static String total = "";
public static String operator = "";
// public values for buttons
public JButton zero;
public JButton one;
public JButton two;
public JButton three;
public JButton four;
public JButton five;
public JButton six;
public JButton seven;
public JButton eight;
public JButton nine;
public JButton equal;
public JButton divide;
public JButton multiply;
public JButton minus;
public JButton plus;
public JButton clear;
public JButton negative;
public JButton decimal;
//attributes for bag layout
final static boolean shouldFill = true;
final static boolean shouldWeightX = true;
final static boolean RIGHT_TO_LEFT = false;
public MyFrame() {
super();
init();
//added strings to constructor frame
}
private void init() {
// creating a grid bag layout
/* FYI
* weight x and weight y refer to the space taking in the frame or space it takes
* grid x and y refers to location of button
* constraints sets limits to avoid things stretching out too much
*/
this.setLayout(new GridBagLayout());
this.setTitle("Calculator");
GridBagConstraints c = new GridBagConstraints();
if (shouldFill) {
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;
}
//all output will shown in this JLabel
display = new JLabel("",SwingConstants.RIGHT); //aligns right
if (shouldWeightX) {
c.weightx = 0.5;
}
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 3;
c.weighty = 1;
c.gridx = 3;
c.gridy = 0;
this.add(display, c);
// this will display an indicator that show the operator currently in use
displayOperator = new JLabel("",SwingConstants.LEFT); //aligns LEFT
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0;
c.weighty = 0;
c.gridx = 0;
c.gridy = 0;
this.add(displayOperator, c);
display.setFont(new Font("Times Roman", Font.PLAIN, 20));
FontMetrics fm = display.getFontMetrics(display.getFont());
int w = fm.stringWidth("00000000"); //set display of numbers by these amount of digits to the text
int h = fm.getHeight();
Dimension size = new Dimension(w, h);
//locks perspective so that JBagged buttons are not autoresized
display.setMinimumSize(size);
display.setPreferredSize(size);
// all input buttons with Button Listeners assigned to them
JButton seven = new JButton("7");
this.add(seven);
c.fill = GridBagConstraints.BOTH;
c.gridx = 0;
c.gridy = 4;
c.weightx = 1;
c.weighty = 1;
this.add(seven, c);
seven.addActionListener(new MyButtonListener(this));
JButton eight = new JButton("8");
this.add(eight);
c.fill = GridBagConstraints.BOTH;
c.gridx = 1;
c.gridy = 4;
c.weightx = 1;
c.weighty = 1;
this.add(eight, c);
eight.addActionListener(new MyButtonListener(this));
JButton nine = new JButton("9");
this.add(nine);
c.fill = GridBagConstraints.BOTH;
c.gridx = 2;
c.gridy = 4;
c.weightx = 1;
c.weighty = 1;
this.add(nine, c);
nine.addActionListener(new MyButtonListener(this));
JButton divide = new JButton("/");
this.add(divide);
c.fill = GridBagConstraints.BOTH;
c.gridx = 3;
c.gridy = 4;
c.weightx = .75;
c.weighty = .75;
this.add(divide, c);
divide.addActionListener(new MyButtonListener(this));
JButton four = new JButton("4");
this.add(four);
c.fill = GridBagConstraints.BOTH;
c.gridx = 0;
c.gridy = 5;
c.weightx = 1;
c.weighty = 1;
this.add(four, c);
four.addActionListener(new MyButtonListener(this));
JButton five = new JButton("5");
this.add(five);
c.fill = GridBagConstraints.BOTH;
c.gridx = 1;
c.gridy = 5;
c.weightx = 1;
c.weighty = 1;
this.add(five, c);
five.addActionListener(new MyButtonListener(this));
JButton six = new JButton("6");
this.add(six);
c.fill = GridBagConstraints.BOTH;
c.gridx = 2;
c.gridy = 5;
c.weightx = 1;
c.weighty = 1;
this.add(six, c);
six.addActionListener(new MyButtonListener(this));
JButton multiply = new JButton("*");
this.add(multiply);
c.fill = GridBagConstraints.BOTH;
c.gridx = 3;
c.gridy = 5;
c.weightx = 1;
c.weighty = 1;
this.add(multiply, c);
multiply.addActionListener(new MyButtonListener(this));
JButton one = new JButton("1");
this.add(one);
c.fill = GridBagConstraints.BOTH;
c.gridx = 0;
c.gridy = 6;
c.weightx = 1;
c.weighty = 1;
this.add(one, c);
one.addActionListener(new MyButtonListener(this));
JButton two = new JButton("2");
this.add(two);
c.fill = GridBagConstraints.BOTH;
c.gridx = 1;
c.gridy = 6;
c.weightx = 1;
c.weighty = 1;
this.add(two, c);
two.addActionListener(new MyButtonListener(this));
JButton three = new JButton("3");
this.add(three);
c.fill = GridBagConstraints.BOTH;
c.gridx = 2;
c.gridy = 6;
c.weightx = 1;
c.weighty = 1;
this.add(three, c);
three.addActionListener(new MyButtonListener(this));
JButton minus = new JButton("-");
this.add(minus);
c.fill = GridBagConstraints.BOTH;
c.gridx = 3;
c.gridy = 6;
c.weightx = 1;
c.weighty = 1;
this.add(minus, c);
minus.addActionListener(new MyButtonListener(this));
JButton zero = new JButton("0");
this.add(zero);
c.fill = GridBagConstraints.BOTH;
c.gridx = 0;
c.gridy = 7;
c.weightx = 1;
c.weighty = 1;
this.add(zero, c);
zero.addActionListener(new MyButtonListener(this));
JButton decimal = new JButton(".");
this.add(decimal);
c.fill = GridBagConstraints.BOTH;
c.gridx = 1;
c.gridy = 7;
c.weightx = 1;
c.weighty = 1;
this.add(decimal, c);
decimal.addActionListener(new MyButtonListener(this));
JButton equal = new JButton("=");
this.add(equal);
c.fill = GridBagConstraints.BOTH;
c.gridx = 2;
c.gridy = 7;
c.weightx = 1;
c.weighty = 1;
this.add(equal, c);
equal.addActionListener(new MyButtonListener(this));
JButton plus = new JButton("+");
this.add(plus);
c.fill = GridBagConstraints.BOTH;
c.gridx = 3;
c.gridy = 7;
c.weightx = 1;
c.weighty = 1;
this.add(plus, c);
plus.addActionListener(new MyButtonListener(this));
JButton clear = new JButton("C");
this.add(clear);
c.fill = GridBagConstraints.BOTH;
c.gridx = 1;
c.gridy = 8;
c.weightx = 1;
c.weighty = 1;
this.add(clear, c);
clear.addActionListener(new MyButtonListener(this));
JButton negative = new JButton("+/-");
this.add(negative);
c.fill = GridBagConstraints.BOTH;
c.gridx = 2;
c.gridy = 8;
c.weightx = 1;
c.weighty = 1;
this.add(negative, c);
negative.addActionListener(new MyButtonListener(this));
JButton percentage = new JButton("%");
this.add(percentage);
c.fill = GridBagConstraints.BOTH;
c.gridx = 0;
c.gridy = 8;
c.weightx = 1;
c.weighty = 1;
this.add(percentage, c);
percentage.addActionListener(new MyButtonListener(this));
// sets dimensions for window and locks resizing
this.setPreferredSize(new Dimension(400,500));
this.setMaximumSize(new Dimension(400,500));
this.setMinimumSize(new Dimension(400,500));
this.pack();
}
}
Related
I am trying to recreate Mac Calculator GUI. I use Swing and GridBagLayout for this project.
I manage to put 0 in a button that span in 2 column grid but I want to center it in the first column grid instead of 2 column grid.
Basically I want to the button to look exactly like:
.
In the calculator, the first column grid (consists of button "AC", "1", "4", "7" and "0") has the texts center evenly.
Here I try to use setHorizontalAlignment(SwingConstants.LEFT) but the result is not what I want.
JButton bt
n_0 = new JButton("0");
btn_0.setHorizontalAlignment(SwingConstants.LEFT);
GridBagConstraints gbc_btn_0 = new GridBagConstraints();
gbc_btn_0.fill = GridBagConstraints.HORIZONTAL;
gbc_btn_0.gridwidth = 2;
gbc_btn_0.insets = new Insets(0, 0, 5, 5);
gbc_btn_0.gridx = 0;
gbc_btn_0.gridy = 5;
frame.getContentPane().add(btn_0, gbc_btn_0);
Is it possible to achieve or are there alternative way to do this?
Do you absolutely need buttons ? I'm not used to the Mac, but if those calculator keys don't require an actual "button" behaviour (3D effect, moving the text when pressed, etc), maybe a plain JPanel would do.
In that case, if your "0" key is a JPanel, applying a GridLayout(1,2) to it and putting a JLabel("0") in the first cell and nothing in the second one would probably achieve the result you want.
Now of course you'll need handle click and key events at the JPanel level (look for example at this answer for more) but I think it would be a "clean" (from a component hierarchy point of view) way of doing it.
Update: Here is what I mean (part between ### comments):
import javax.swing.*;
import javax.swing.border.LineBorder;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class Calculator {
public static final Color CALC_BACKGROUND = new Color(44, 45, 47);
public static final Color KEY_BG_LAST_OPERATION = new Color(255,159,12);
public static final Color KEY_BG_NUMBER = new Color(96,97,99);
public static final Color KEY_BG_SPECIAL = new Color(64,65,67);
public static final Font BUTTON_FONT = new Font("SansSerif", Font.PLAIN, 30);
private static JComponent make0Button(String text) {
JPanel panel = new JPanel();
panel.setBorder(new LineBorder(CALC_BACKGROUND));
panel.setBackground(KEY_BG_NUMBER);
final JLabel label = new JLabel(text);
label.setFont(BUTTON_FONT);
label.setForeground(Color.WHITE);
label.setHorizontalAlignment(JLabel.CENTER);
label.setVerticalAlignment(JLabel.CENTER);
//#######################################
// The "0" key is a panel with two cells
panel.setLayout(new GridLayout(1, 2));
// The "0" text on the left
panel.add(label);
// A blank (dummy) label on the right
panel.add(new JLabel(" "));
//#######################################
panel.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
System.out.println(text);
}
});
return panel;
}
private static JComponent makeStdButton(String text, Color color) {
JPanel panel = new JPanel();
panel.setBorder(new LineBorder(CALC_BACKGROUND));
panel.setBackground(color);
panel.setLayout(new GridLayout(1, 1));
JLabel label = new JLabel(text);
label.setFont(BUTTON_FONT);
label.setForeground(Color.WHITE);
label.setHorizontalAlignment(JLabel.CENTER);
label.setVerticalAlignment(JLabel.CENTER);
panel.add(label);
panel.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
System.out.println(text);
}
});
return panel;
}
public static void addComponentsToPane(Container container) {
container.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
// Result (top)
c.anchor = GridBagConstraints.EAST;
c.fill = GridBagConstraints.BOTH;
c.gridwidth = 4;
c.gridx = 0; c.gridy = 0;
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.setBackground(CALC_BACKGROUND);
final JLabel resultLabel = new JLabel("0");
resultLabel.setFont(new Font("SansSerif", Font.PLAIN, 100));
resultLabel.setForeground(Color.WHITE);
panel.add(resultLabel, BorderLayout.EAST);
container.add(panel, c);
// Special "0" key
c = new GridBagConstraints();
c.anchor = GridBagConstraints.CENTER;
c.fill = GridBagConstraints.BOTH;
c.gridwidth = 2;
c.gridx = 0; c.gridy = 5;
container.add(make0Button("0"), c);
// All other keys
c = new GridBagConstraints();
c.fill = GridBagConstraints.BOTH;
c.gridwidth = 1;
c.weightx = 1;
c.weighty = 1;
c.gridx = 0; c.gridy = 1;
container.add(makeStdButton("AC", KEY_BG_SPECIAL), c);
c.gridx = 1; c.gridy = 1;
container.add(makeStdButton("+/-", KEY_BG_SPECIAL), c);
c.gridx = 2; c.gridy = 1;
container.add(makeStdButton("%", KEY_BG_SPECIAL), c);
c.gridx = 3; c.gridy = 1;
container.add(makeStdButton("/", KEY_BG_LAST_OPERATION), c);
c.gridx = 0; c.gridy = 2;
container.add(makeStdButton("7", KEY_BG_NUMBER), c);
c.gridx = 1; c.gridy = 2;
container.add(makeStdButton("8", KEY_BG_NUMBER), c);
c.gridx = 2; c.gridy = 2;
container.add(makeStdButton("9", KEY_BG_NUMBER), c);
c.gridx = 3; c.gridy = 2;
container.add(makeStdButton("x", KEY_BG_LAST_OPERATION), c);
c.gridx = 0; c.gridy = 3;
container.add(makeStdButton("4", KEY_BG_NUMBER), c);
c.gridx = 1; c.gridy = 3;
container.add(makeStdButton("5", KEY_BG_NUMBER), c);
c.gridx = 2; c.gridy = 3;
container.add(makeStdButton("6", KEY_BG_NUMBER), c);
c.gridx = 3; c.gridy = 3;
container.add(makeStdButton("-", KEY_BG_LAST_OPERATION), c);
c.gridx = 0; c.gridy = 4;
container.add(makeStdButton("1", KEY_BG_NUMBER), c);
c.gridx = 1; c.gridy = 4;
container.add(makeStdButton("2", KEY_BG_NUMBER), c);
c.gridx = 2; c.gridy = 4;
container.add(makeStdButton("3", KEY_BG_NUMBER), c);
c.gridx = 3; c.gridy = 4;
container.add(makeStdButton("+", KEY_BG_LAST_OPERATION), c);
c.gridx = 2; c.gridy = 5;
container.add(makeStdButton(".", KEY_BG_NUMBER), c);
c.gridx = 3; c.gridy = 5;
container.add(makeStdButton("=", KEY_BG_LAST_OPERATION), c);
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addComponentsToPane(frame.getContentPane());
frame.setSize(400,600);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGUI());
}
}
Looks to me it's quite close to the expected layout... (with clicks, see console)
I recommend you to use:
mig_layout library.
allows you to make easy/adaptable designs and you can solve your problem.
I have never used layouts before and from what I understand GridBagLayout is probably not the easiest layout to start on, however I am trying to use it anyway. I am trying to use the GridBagLayout for my JPanel so that when I re-size it the components grow. I only need it to keep the natural height of the components but I am trying to use GridBagConstraints.HORIZONTAL to make the width of a component re-size automatically. I have the code
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.font.*;
import java.io.*;
public class NumberConverterDesignTest
{
JFrame numberConversionWindow = new JFrame("Number Conversion");
JPanel numberPanel = new JPanel();
////////COMPONENTS////////
JLabel lblTitle;
JLabel lblBase2;
JLabel lblBase8;
JLabel lblBase10;
JLabel lblBase16;
JTextField txtBase2;
JTextField txtBase8;
JTextField txtBase10;
JTextField txtBase16;
///////////Font///////////
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
String []fontFamilies = ge.getAvailableFontFamilyNames();
Font FontT5 = new Font("SansSerif", Font.BOLD, 45);
public void numberConvertGUI()
{
numberConversionWindow.setBounds(10, 10, 420, 300);
numberConversionWindow.setMinimumSize(new Dimension(420, 300));
numberConversionWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
numberConversionWindow.setLayout(new GridLayout(1,1));
createNumberConversionPanel();
numberConversionWindow.getContentPane().add(numberPanel);
numberConversionWindow.setVisible(true);
}
public void createNumberConversionPanel()
{
numberPanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
lblTitle = new JLabel();
c.weightx = 0.5;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 2;
lblTitle.setText("Number Converter");
lblTitle.setHorizontalAlignment(JLabel.CENTER);
lblTitle.setFont(FontT5);
numberPanel.add(lblTitle, c);
lblBase2 = new JLabel();
c.weightx = 0.0;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
lblBase2.setText("Binary: ");
lblBase2.setHorizontalAlignment(JLabel.RIGHT);
numberPanel.add(lblBase2);
lblBase8 = new JLabel();
//c.weightx = 0.5;
c.weighty = 1.0;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 2;
lblBase8.setText("Octal: ");
lblBase8.setHorizontalAlignment(JLabel.RIGHT);
numberPanel.add(lblBase8);
lblBase10 = new JLabel();
c.weightx = 0.5;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 3;
lblBase10.setText("Decimal: ");
lblBase10.setHorizontalAlignment(JLabel.RIGHT);
numberPanel.add(lblBase10);
lblBase16 = new JLabel();
c.weightx = 0.5;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 4;
lblBase16.setText("Hexadecimal: ");
lblBase16.setHorizontalAlignment(JLabel.RIGHT);
numberPanel.add(lblBase16);
txtBase2 = new JTextField();
c.weightx = 0.0;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 1;
txtBase2.setText("");
numberPanel.add(txtBase2);
txtBase8 = new JTextField();
//c.weightx = 0.5;
c.weighty = 1.0;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 2;
txtBase8.setText("");
numberPanel.add(txtBase8);
txtBase10 = new JTextField();
c.weightx = 0.5;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 3;
txtBase10.setText("");
numberPanel.add(txtBase10);
txtBase16 = new JTextField();
c.weightx = 0.5;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 4;
txtBase16.setText("");
numberPanel.add(txtBase16);
}
public static void main(String[] args)
{
NumberConverterDesignTest nC = new NumberConverterDesignTest();
nC.numberConvertGUI();
}
}
and when this is compiled I get
My aim is to try and get
I believe the problem to be what I have set weightx to be, however I am not sure what to set it to, to get the result that I would like. Any help would be greatly appreciated
You need to pass the updated constraint each time you call the numberPanel.add method.
When I use the code below to make a JFrame using a GridBagLayout, this is the output:
I want the first three rows' buttons to all have equal widths, but they aren't.
I also want the fourth row buttons to all have equal widths.
How can I do this?
Here is the code:
public Test() {
setTitle("Calculator");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar menu = new JMenuBar();
setJMenuBar(menu);
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
field = new JTextField(20);
field.setFont(new Font("Cambria Math", Font.PLAIN, 32));
field.setEditable(false);
updateDisplay();
c.fill = GridBagConstraints.HORIZONTAL;
//c.insets = new Insets(9,9,9,9);
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 24;
c.gridheight = 2;
add(field, c);
// sin, cos, tan
c.weightx = 0;
c.gridwidth = 4;
c.gridheight = 1;
c.gridx = 0;
c.weightx = 0;
c.gridy = 2;
add(createButton("sin"), c);
c.gridx = 4;
add(createButton("cos"), c);
c.gridx = 8;
add(createButton("tan"), c);
// cot, sec, csc
c.gridx = 0;
c.gridy = 3;
add(createButton("cot"), c);
c.gridx = 4;
add(createButton("sec"), c);
c.gridx = 8;
add(createButton("csc"), c);
// asin, acos, atan
c.gridx = 0;
c.gridy = 4;
add(createButton("asin"), c);
c.gridx = 4;
add(createButton("acos"), c);
c.gridx = 8;
add(createButton("atan"), c);
// atan2, acot, asec, acsc
c.gridy = 5;
c.gridwidth = 3;
c.weightx = 0;
c.gridx = 0;
add(createButton("atan2"), c);
c.gridx = 3;
add(createButton("acot"), c);
c.gridx = 6;
add(createButton("asec"), c);
c.gridx = 9;
add(createButton("acsc"), c);
pack();
setVisible(true);
}
public JButton createButton(String name) {
JButton button = new JButton(name);
button.setActionCommand(name);
button.addActionListener(this);
button.setFont(new Font("Dialog", Font.PLAIN, 25));
return button;
}
I don't think you can use GridBagLayout for this.
Instead create a main panel with a GridLayout(0, 1);
Then create second panel for the first 3 buttons with a GridLayout(1, 0) and add this panel to the first panel.
Repeat for the other three rows.
i new to java and swing (came from c#) and try to add scrollbar to my textarea with no success.
I tried all kinds of techniques , it is very difficult to me
please take a look on the following code, I would be very happy
package firmwareUpdate;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
public class firmwareUpdate {
public static void main(String[] args) {
Runnable r = new Runnable() {
#Override
public void run() {
new firmwareUpdate().createUI();
}
};
EventQueue.invokeLater(r);
}
private void createUI() {
JFrame frame = new JFrame();
frame.getContentPane().setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;
// row #1
JButton btnUpload = new JButton("Browse hex/bin file...");
c.weightx = 0.5;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 1;
frame.getContentPane().add(btnUpload, c);
JLabel lblFileName = new JLabel("aaa");
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.5;
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 4;
frame.getContentPane().add(lblFileName, c);
// row #2
JButton btnConfig = new JButton("Config");
// c.fill = GridBagConstraints.HORIZONTAL;
// c.ipady = 40; //make this component tall
// c.weightx = 0.0;
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 1;
frame.getContentPane().add(btnConfig, c);
JButton btnHex2Bin = new JButton("hex2bin");
// c.fill = GridBagConstraints.HORIZONTAL;
// c.ipady = 40; //make this component tall
// c.weightx = 0.0;
c.gridx = 1;
c.gridy = 2;
c.gridwidth = 1;
frame.getContentPane().add(btnHex2Bin, c);
JButton btnFirmwareUpdate = new JButton("Firmware Update");
// c.fill = GridBagConstraints.HORIZONTAL;
// c.ipady = 40; //make this component tall
// c.weightx = 0.0;
c.gridx = 2;
c.gridy = 2;
c.gridwidth = 1;
frame.getContentPane().add(btnFirmwareUpdate, c);
JButton btnFirmwareUpdateStop = new JButton("Firmware Update Stop");
//c.fill = GridBagConstraints.HORIZONTAL;
// c.ipady = 40; //make this component tall
//c.weightx = 0.0;
c.gridx = 3;
c.gridy = 2;
c.gridwidth = 1;
frame.getContentPane().add(btnFirmwareUpdateStop, c);
// row #3
JButton btnCheckSum = new JButton("Check Checksum");
c.fill = GridBagConstraints.HORIZONTAL;
// c.ipady = 40; //make this component tall
c.weightx = 0.0;
c.gridx = 0;
c.gridy = 3;
c.gridwidth = 1;
frame.getContentPane().add(btnCheckSum, c);
JButton btnStartBootloader = new JButton("Start Bootloader");
c.fill = GridBagConstraints.HORIZONTAL;
// c.ipady = 40; //make this component tall
c.weightx = 0.0;
c.gridx = 1;
c.gridy = 3;
c.gridwidth = 1;
frame.getContentPane().add(btnStartBootloader, c);
JButton btnStartApplication = new JButton("Start Application");
c.fill = GridBagConstraints.HORIZONTAL;
// c.ipady = 40; //make this component tall
c.weightx = 0.0;
c.gridx = 2;
c.gridy = 3;
c.gridwidth = 1;
frame.getContentPane().add(btnStartApplication, c);
JTextArea txtFileContent = new JTextArea(30,68);
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 0; //reset to default
c.weighty = 1.0; //request any extra vertical space
c.anchor = GridBagConstraints.PAGE_START; //bottom of space
c.insets = new Insets(10,0,0,0); //top padding
c.gridx = 0; //aligned with button 2
c.gridy = 4; //third row
c.gridwidth = 4; //4 columns wide
frame.getContentPane().add(txtFileContent, c);
//txtFileContent.setVisible(false);
////////////// JScrollPane scrollPane = new JScrollPane(txtFileContent);
/////////////// scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
// middlePanel.add(scrollPane);
// scrollPane.setBounds(10,60,780,500);
//scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
////////////////// frame.getContentPane().add(scrollPane);
txtFileContent.setLineWrap(true);
txtFileContent.setWrapStyleWord(true);
JScrollPane scrolltxt = new JScrollPane();
scrolltxt.setViewportView(txtFileContent);
scrolltxt.setWheelScrollingEnabled(true);
frame.getContentPane().add(scrolltxt, c);
frame.setIconImage(new ImageIcon(getClass().getResource("/resources/fwup.png")).getImage());
frame.setTitle("Firmware Update");
//frame.setSize(600,800);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}
Try This
JTextArea txtFileContent = new JTextArea(30,68);
JScrollPane scroll = new JScrollPane(txtFileContent);
frame.add(scroll);
I'm not too sure if this will solve your problem, but have you considered that not setting any column widths or heights in your layout may be your concern (line 30 of the code)? Allow me to give you an example:
GridBagLayout layout=new GridBagLayout();
GridBagConstraints gbc=new GridBagConstraints();
layout.columnWidths=new int[] {198, 198};
layout.rowHeights=new int[] {70};
panel.setLayout(layout);
Wherein, panel is a panel that is pushed onto the JFrame.
NB: I am personally against using the built-in content pane of a JFrame, because of its tendancies to default out on the user; however, for all intents and purposes, it shouldn't be a problem if done right.
I hope this helps, and best of luck!
When I tested your code, the scroll bar for the JTextArea shows up as expected when you exceed the row count of the initial JTextArea (The default value for the scrollbars' visibility are only to be shown when needed: JScrollPane API under verticalScrollBarPolicy and horizontalScrollBarPolicy). If you are asking to have it default as visible, then use either setVerticalScrollBarPolicy(...) or setHorizontalScrollBarPolicy(...) on your JScrollPane variable. There are several options available for ScrollPaneConstants
In a JFrame with a BorderLayout, I have a "control panel" (with buttons and stuff) on the bottom of the window. In the JPanel of this "control panel" I'd like to use a GridBagLayout.
This is the result I have right now.
I was thinking to divide the layout in a 3 rows x 8 columns table.
In this configuration, the "+" symbol should take just one square and all the buttons should fill the panel.
The code is this:
buttonsPanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
removeCost = new JButton("-");
c.gridx = 5;
c.gridy = 0;
buttonsPanel.add(removeCost, c);
addCost = new JButton("+");
c.gridx = 7;
c.gridy = 0;
buttonsPanel.add(addCost, c);
text = new JLabel("Incasso");
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 3;
buttonsPanel.add(text, c);
cost = new JTextArea();
cost.setBorder(BorderFactory.createLineBorder(Color.black, 1, true));
cost.setPreferredSize(new Dimension(80, 18));
c.gridx = 5;
c.gridy = 1;
c.gridwidth = 3;
buttonsPanel.add(cost, c);
cancel = new JButton("Cancella");
c.anchor = GridBagConstraints.LINE_START;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 3;
c.insets = new Insets(0, 2, 2, 30);
buttonsPanel.add(cancel, c);
enter = new JButton("Accetta");
c.anchor = GridBagConstraints.LINE_END;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 5;
c.gridy = 2;
c.gridwidth = 3;
c.insets = new Insets(0, 30, 2, 2);
buttonsPanel.add(enter, c);
What am I doing wrong?
You can not create a new instance of the GridBagConstrains. I did so.
I execute your code. Please see screenshot.
import javax.swing.*;
import java.awt.*;
public class app {
public static void main(String[] args) {
JFrame frame = new JFrame();
JPanel buttonsPanel = new JPanel(new GridBagLayout());
frame.add(buttonsPanel);
// =====================
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
JButton removeCost = new JButton("-");
c.gridx = 5;
c.gridy = 0;
buttonsPanel.add(removeCost, c);
JButton addCost = new JButton("+");
c.gridx = 7;
c.gridy = 0;
buttonsPanel.add(addCost, c);
JLabel text = new JLabel("Incasso");
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 3;
buttonsPanel.add(text, c);
JTextArea cost = new JTextArea();
cost.setBorder(BorderFactory.createLineBorder(Color.black, 1, true));
cost.setPreferredSize(new Dimension(80, 18));
c.gridx = 5;
c.gridy = 1;
c.gridwidth = 3;
buttonsPanel.add(cost, c);
JButton cancel = new JButton("Cancella");
c.anchor = GridBagConstraints.LINE_START;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 3;
c.insets = new Insets(0, 2, 2, 30);
buttonsPanel.add(cancel, c);
JButton enter = new JButton("Accetta");
c.anchor = GridBagConstraints.LINE_END;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 5;
c.gridy = 2;
c.gridwidth = 3;
c.insets = new Insets(0, 30, 2, 2);
buttonsPanel.add(enter, c);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setSize(new Dimension(400, 400));
}
}
You need to have this behavior?
You need to create a new instance of the GridBagConstraints (c = new GridBagConstraints) every time you use it as a parameter to the add method.