I`m trying to create a Java Applet, I was looking around on the Java website and I found an nice example which I edited.
In this example there are 3 buttons, One that will be like a header, one that will be like a footer
and one that will be like the body. My problem is that, the middle (body) button will not expand fully.
If you run this code, you will see what I mean.
import java.awt.*;
import javax.swing.JButton;
import javax.swing.JFrame;
public class main {
final static boolean shouldFill = true;
final static boolean shouldWeightX = true;
final static boolean RIGHT_TO_LEFT = false;
public static void addComponentsToPane(Container pane) {
if (RIGHT_TO_LEFT) {
pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
}
JButton button;
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
if (shouldFill) {
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;
}
button = new JButton("hi");
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.5;
c.gridx = 1;
c.gridy = 0;
c.ipady = 40;
pane.add(button, c);
button = new JButton("Hello, i will not expand");
c.fill = GridBagConstraints.BOTH;
c.weighty = 1.0; //request any extra vertical space
c.weightx=1.0;
c.anchor = GridBagConstraints.CENTER; //bottom of space
c.insets = new Insets(10,0,0,0); //top padding
c.gridx = 1; //aligned with button 2
c.gridy = 1; //third row
pane.add(button, c);
button = new JButton("fr");
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 0; //reset to default
c.weighty = 1.0; //request any extra vertical space
c.anchor = GridBagConstraints.PAGE_END; //bottom of space
c.insets = new Insets(10,0,0,0); //top padding
c.gridx = 1; //aligned with button 2
c.gridwidth = 2; //2 columns wide
c.gridy = 2; //third row
pane.add(button, c);
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("main");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Set up the content pane.
addComponentsToPane(frame.getContentPane());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
Looks like it's not the middle button's fault, but the bottom button that is not expanding, if you set the bottom button as so c.fill = GridBagConstraints.BOTH; then it takes up the empty space below.
Do you want the middle to be bigger? You might want to change the weight of the bottom button to .5
c.weighty = .5; //request any extra vertical space
and see if that is what you are looking for?
If you want the middle to be much bigger then the top and bottom, you may need to make more grid spaces, so rather then 1,1,1, try 1,3,1 etc
I was looking around on the Java website and I found an nice example which I edited.
So I take it you don't have to use a GridBagLayout?
Use a BorderLayout, make the expandable button at position BorderLayout.CENTER.
http://docs.oracle.com/javase/tutorial/uiswing/layout/border.html
Related
I'm trying to make a mine sweeper game with Swing library (just for training).
I spotted a problem when I tried to change size of a button with setSize() method (part of Container class). One of my previous program was able to handle that (with ActionListener)
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ButtonChanger extends JFrame {
JButton big, small, dis;
JLabel message, poof;
public ButtonChanger(){
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
message = new JLabel("Click to make it");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 0;
add(message, c);
big = new JButton("BIG");
big.setSize(30, 30); // no reaction for this call
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 1;
add(big, c);
small = new JButton("small");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 1;
add(small, c);
dis = new JButton("disapear");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 1;
add(dis, c);
poof = new JLabel(" poof!");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 1;
poof.setVisible(false);
add(poof, c);
big.setSize(300,300); // same story
event a = new event();
big.addActionListener(a);
small.addActionListener(a);
dis.addActionListener(a);
}
public class event implements ActionListener{
public void actionPerformed(ActionEvent a){
String op = a.getActionCommand();
if(op.equals("BIG")){
big.setSize(50,50); // finaly!
} else if(op.equals("small")){
small.setSize(10,10);
} else if(op.equals("disapear")){
dis.setVisible(false);
poof.setVisible(true);
}
}
}
public static void main(String args[]){
ButtonChanger gui = new ButtonChanger();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setVisible(true);
gui.setSize(250,250);
gui.setTitle("");
}
}
But when I tried to use same solution here - nothing happened.
import java.util.Random;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Board extends JPanel
implements ActionListener{
private Integer pixelWidth;
private Integer pixelHeight;
public Field[][] board;
private Random generator = new Random();
public Board(int width,int height){ // width - x axis scaled with "button" unit
// height - y axis scaled with "button" unit
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
board = new Field[width][height];
pixelWidth = width * Field.fieldW;
pixelHeight = height * Field.fieldH;
for(int i = 0;i < height;i++)
for(int j = 0;j < width;j++){
board[i][j] = new Field(generator.nextBoolean());
}
for(int i = 0;i < height;i++){
c.fill = GridBagConstraints.HORIZONTAL;
c.gridy = i;
for(int j = 0;j < width;j++){
c.gridx = j;
add(board[i][j].getFieldButton(),c);
add(board[i][j].getFieldLabel(),c);
}
}
/* for(int i = 0;i < height;i++)
for(int j = 0;j < width;j++){
board[i][j].setField();
}*/
}
public void actionPerformed(ActionEvent e){
String co = e.getActionCommand();
if(co.equals(" ")){ // button is single space sign
for(int i = 0;i < 10;i++)
for(int j = 0;j < 10;j++){
board[i][j].setField(); //inside this method is call for setSize() for fieldButton
}
}
}
}
Previously I changed Board class to make it inhetitate after JFrame (set up as main GUI frame in whole code) but that gave me same output as original.
Did I mess up something?
big = new JButton("BIG");
big.setSize(30, 30); // no reaction for this call
c.fill = GridBagConstraints.HORIZONTAL;
There is no reaction for big.setSize... because then in GridBagConstraints you set fill to horizontal, so button will be "stretched" to fill horizontally.
Instead use c.fill = GridBagConstraints.NONE
fill
Used when the component's display area is larger than the component's requested size to determine whether and how to resize the component. Valid values (defined as GridBagConstraints constants) include NONE (the default), HORIZONTAL (make the component wide enough to fill its display area horizontally, but do not change its height), VERTICAL (make the component tall enough to fill its display area vertically, but do not change its width), and BOTH (make the component fill its display area entirely).
You can read more here: https://docs.oracle.com/javase/tutorial/uiswing/layout/gridbag.html
I am trying to set the layout of a JFrame to be a grid bag layout. I want to to essentially look like 4 grids of equal size, but with the bottom 2 merged into one panel. I am adding JPanels to each. However, I get 3 small grids at the middle of the JFrame, not properly sized. It looks like this instead.
My code is as follows:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Hangman extends JPanel{
private String word;
private JPanel hA, gL, letters;
public void setupLayout(JFrame window){
window.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
hA = new JPanel();
hA.setBackground(Color.blue);
c.fill = GridBagConstraints.BOTH;
c.gridx = 0;
c.gridy = 0;
window.add(hA, c);
gL = new JPanel();
gL.setBackground(Color.green);
c.fill = GridBagConstraints.BOTH;
c.gridx = 1;
c.gridy = 0;
window.add(gL, c);
letters = new JPanel();
letters.setBackground(Color.black);
c.fill = GridBagConstraints.BOTH;
c.weightx = 1.0;
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 2;
window.add(letters, c);
}
public void startWindow(){
JFrame window = new JFrame();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
int screenHeight = (int) screenSize.getHeight();
int windowHeight = (int) ((screenHeight / 4) * 3);
window.setSize(windowHeight, windowHeight);
window.setLocationRelativeTo(null);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setupLayout(window);
window.setVisible(true);
}
public void startGame(){
Prep prepare = new Prep();
word = prepare.findWord(true);
startWindow();
}
public static void main(String[] args){
Hangman start = new Hangman();
start.startGame();
}
}
It's not very important what Prep does. It just takes a random word from a text file. I couldn't see how it would affect the layout. To recap, I need to make it so each of the 4 grid spaces span one fourth of the window, and then make the bottom 2 cells merged with a JPanel added to each of them. Any help is appreciated. Thank you in advance.
EDIT:
I needed to set the weight of all of them to be 1. It is solved.
GridBagLayout displays each component at its preferred size. Since you didn't add any components to the panels you just see a small panel.
If you want the panels to fill the space available then you need to play with the constraints.
Read the section from the Swing tutorial on How to Use GridBagLayout for more information and working examples. You will want to look at the "fill" and "weightx/weighty" constraints.
and then make the bottom 2 cells merged
you will also need to look at the "gridwidth/gridheight" constraints.
I have several methods which create their own component, JButton or JLabel in a JPanel. Then I have a separate method which adds all these JPanels the the JFrame. I also use gridx and gridy on the JPanels to position them how I want. This is: lookreply on the left, then top right the title and below in a 2X2 table quit, restart, pickup and hello. However my current code when run displays a weird, random layout.
The lookreply is on the left, but then to the right is quit, a space, restart then hello all vertical. pickup and title aren't seen. I dont know why this is happening.
Please see my code below.:
public class GUI extends JPanel
{
/**
* Creation of variables used throughout the GUI Class.
*/
//JPanel panel = new JPanel(new GridBagLayout());
private static final long serialVersionUID = 1L;
public static void main(String[] args)
{
GUI g = new GUI();
g.create();
}
private void create()
{
JFrame screen = new JFrame("Dungeon of Doom");
screen.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
screen.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
//set size to full screen.
screen.setExtendedState(Frame.MAXIMIZED_BOTH);
//Add all JPanes to screen
screen.add(lookReply(), c);
c.gridy = 0;
c.gridx = 0;
screen.add(title(), c);
c.gridy = 0;
c.gridx = 1;
c.gridwidth = 2;
screen.add(quit(), c);
c.gridy = 1;
c.gridx = 1;
screen.add(restart(), c);
c.gridy = 1;
c.gridx = 2;
screen.add(pickup(), c);
c.gridy = 2;
c.gridx = 1;
screen.add(hello(), c);
c.gridy = 2;
c.gridx = 2;
screen.setVisible(true);
}
One of the methods (quit)
private JPanel quit()
{
JPanel quitPanel = new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
JButton quit = new JButton("QUIT");
quitPanel.add(quit, c);
return quitPanel;
}
All the other methods are pretty much the same except the title is a a JLabel and the table iterates to create a 5x5 table of JLabel within its own JPanel. Any help is appreciated!
I have found what was doing this.
As seen in the code I was adding the component before setting the layout.
screen.add(lookReply(), c);
c.gridy = 0;
c.gridx = 0;
whereas it should be
c.gridy = 0;
c.gridx = 0;
screen.add(lookReply(), c);
I have a JFrame which consists mainly of a left and right side. The left has 2 components 1 above the other, and the right has 9, again 1 on top of each other. As the left has 2, I want 1 component to equal the same vertical space as 6 on the right. I am using the gridBagConstraints layout and have each JPanel positioned in the main JFrame. Everything looks OK (apart from what I was just saying). To sort this problem I use c.gridHeight = 6 on the JPanel on the left. However this then puts the 6 JPanels which are on the right ontop of each other, ignoring their formatting. How can I rectify this problem? Snipets of my code which still cause the same problem are:
void create()
{
JFrame screen = new JFrame("Dungeon of Doom");
screen.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
screen.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
screen.setSize(new Dimension(screenWidth, screenHeight));
screen.setPreferredSize(new Dimension(screenWidth, screenHeight));
//Add all JPanes to screen
c.gridy = 0;
c.gridx = 0;
c.gridheight = 6;
screen.add(lookReply(), c);
c.gridy = 0;
c.gridx = 1;
screen.add(title(), c);
c.gridy = 1;
c.gridx = 1;
screen.add(space(), c);
c.gridy = 2;
c.gridx = 1;
screen.add(commands(), c);
//...So on, same for others
}
A sample method - the JPanel - all methods have the same content just different titles and less/more buttons/labels
private JPanel title()
{
JPanel titlePanel = new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
titlePanel.setBackground(Color.red);
titlePanel.setOpaque(true);
JLabel title = new JLabel("DOD");
titlePanel.add(title, c);
return titlePanel;
}
I put a background on the JPanels just to help see where they are in the window
All help appreciated! Thanks :)
The code below was copied from Oracle tutorials and modified to place components OTHER than buttons--a label and two text fields and an additional button. It produces the form that it should (shown below), so you shouldn't have to scrutinize the first 30 or so lines of code:
If I UNcomment out the two lines that refer to "box" and comment out the adjoining lines that refer to button, look at where the checkbox is placed.
I can't figure out how what's going on. I want the checkbox on the last line, as the code SEEMS to say it MUST be positioned, yet it is NOT.
All I am doing is changing TWO LINES that refer to button to refer instead to checkbox. Are the rules for GridBagLayout component-dependent?? What should I do (and why isn't the code working as is) to get checkbox on bottom line?
public class Testy {
public static void addComponentsToPane(Container pane) {
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.5;
c.gridx = 0; c.gridy = 0;
JLabel label = new JLabel("Button 1 ");
pane.add(label, c);
JTextField text = new JTextField("Button 2 ");
c.gridx = 1; c.gridy = 0;
pane.add(text, c);
JButton button = new JButton("Button 3 ");
c.gridx = 2; c.gridy = 0;
pane.add(button, c);
text = new JTextField("LONG Text 4 ");
c.ipady = 40;
c.weightx = 0.0;
c.gridwidth = 3;
c.gridx = 0; c.gridy = 1;
pane.add(text, c);
button = new JButton("5 ");
c.ipady = 0;
c.weighty = 1.0;
c.gridx = 1; c.gridy = 2;
c.gridwidth = 2;
pane.add(button, c);
// Here's the part of the code in question
button = new JButton("666"); // This placement is FINE, at bottom of form.
// JCheckBox box = new JCheckBox("Me?"); // "box" does NOT get placed on last line.
c.weighty = 0;
c.gridx = 0; c.gridy = 3;
c.gridwidth = 1;
// pane.add(box);
pane.add(button, c);
}
Here are the required imports and two methods that I removed so the problem code area above could be seen without scrolling:
import java.awt.*;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
private static void createAndShowGUI() /* calls addComponentsToPane() */{
JFrame frame = new JFrame("GridBagLayoutDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addComponentsToPane(frame.getContentPane());
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) /* calls createAndShowGUI() */ {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
} }); }
}
// pane.add(box);
pane.add(button, c);
You just have to use the right method:
pane.add(box, c);
See Container#add(Component comp) and Container#add(Component comp, Object constraints).