I am developing a Java Desktop Application. In the GUI, I want that user can add as many toolbars dynamically as he wants. To implement this, the following are the things that I have done already:
Have taken a mainPanel and set its layout as BorderLayout
Then taken a topPanel and added it to the mainPanel's BorderLayout.NORTH
set the topPanel's layout as BoxLayout
Then taken 5 panels named toolbar1Panel, toolbar2Panel, ....
Afterthat, have added one toolbar to each of the toolbarPanel created in the previous steps.
Have added only one toolbarPanel i.e toolbar1Panel on the topPanel
Now there is a button named "Add" on the first toolbar which is added on the "toolbar1Panel" which in turn is added to the topPanel.
Now I have implemented the "actionPerformed()" method of the above "Add" button as follows:
// to add second toolbar Panel to the topPanel dynamically
topPanel.add(toolbar2Panel);
But the problem is that it is not working. Means there is no toolbar added to the topPanel.
Is there anything which I am missing.
The code is Netbeans Generated so I think it would only add mess for others, that's why I haven't pasted any code here.
After adding another toolbar to the BoxLayout, you may need to (re|in)?validate the panel.
I've done this repeatedly but I can't understand the logic behind the 3 or so method calls; so I just try them until I hit on the one that works:
topPanel.validate();
topPanel.invalidate();
topPanel.revalidate();
topPanel.layout();
(at least) one of those should force your GUI to re-calculate its layout, making the north panel larger and thus showing the 2nd (and successive) toolbar(s) you've added.
Without specifying the layout for the top panel, it might be assuming the incorrect one.
Adding two toolbar panels to it might just be replacing the first with the second, or ignoring the second.
Just for testing set the topPanel's layout to FlowLayout and try again.
I think you are trying to do too much before testing. the way I would approach this is to start with something very simple, for example one panel, one static label. When that appears as you expect add a toolbar with a menu item. Does that work. Then incrmentally add the pieces.
Quite likely you'll have problems with a simple case and can then figure it out, or you'll have a simple case to post here.
Alterntively, as starting point pinck some working example from the net. Cut it down and then build up to your case.
Does it help ?
Is it what you want to achieve ?
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToolBar;
import javax.swing.SwingUtilities;
public class AddingToolbars {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
AddingToolbars me = new AddingToolbars();
me.initGui();
}
});
}
private JPanel topPanel;
private JPanel mainPanel;
private JFrame frame;
private void initGui() {
frame = new JFrame();
mainPanel = new JPanel(new BorderLayout());
frame.setContentPane(mainPanel);
topPanel = new JPanel();
BoxLayout bLayout = new BoxLayout(topPanel,BoxLayout.Y_AXIS);
topPanel.setLayout(bLayout);
mainPanel.add(topPanel,BorderLayout.NORTH);
JButton addButton = new JButton("Add toolbar");
mainPanel.add(addButton,BorderLayout.CENTER);
addButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
addNewToolBar();
}
});
frame.setSize(500,500);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
protected void addNewToolBar() {
JToolBar tb = new JToolBar();
tb.add(new JButton("b1"));
tb.add(new JButton("b2"));
tb.add(new JButton("b3"));
topPanel.add(tb);
mainPanel.validate();
}
}
Related
I know this question has been asked a lot and I have done my research but still can not find anything. Below is proof of this before anyone gets upset:
I found this link:
https://coderanch.com/t/563764/java/Blank-Frame-Panel
and this:
Adding panels to frame, but not showing when app is run
and this:
Why shouldn't I call setVisible(true) before adding components?
and this:
JPanel not showing in JFrame?
But the first question says use repaint which I tried with no fix and the second and third to last questions talk about putting setVisible after components added which I have.
The last one talks about making the users JPanelArt a extension (done so) of JPanel instead of JFrame and not to make a frame in a frame constructor (also have not done)
When ever I run this I just get a blank frame, as if the panel was never added in.
I apologise if I have missed something in those links. Anyway below is my classes:
GUI.java (extends JFrame)
package javaapplication2;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GUI extends JFrame{
public GUI(String name) {
super(name);
getContentPane().setLayout(null);
JPanel myPanel1 = new GUIPanel();
myPanel1.setLocation(20, 20);
getContentPane().add(myPanel1);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
setResizable(true);
}
public static void main(String[] args) {
JFrame frame = new GUI("Game");
frame.setVisible(true);
}
}
GUIPanel.java (extends JPanel)
package javaapplication2;
import java.awt.*;
import javax.swing.*;
public class GUIPanel extends JPanel {
JButton start;
JButton inspect1;
JButton inspect2;
JButton inspect3;
JButton suspect;
public GUIPanel() {
setLayout(new BorderLayout());
start = new JButton("Start Game");
inspect1 = new JButton("Inspect 1");
inspect2 = new JButton("Inspect 2");
inspect3 = new JButton("Inspect 3");
suspect = new JButton("Choose Suspect");
add(start, BorderLayout.WEST);
add(inspect1, BorderLayout.WEST);
add(inspect2, BorderLayout.WEST);
add(inspect3, BorderLayout.WEST);
add(suspect, BorderLayout.WEST);
}
}
I know it is very simple, but that is because I am following a tutorial from my lecturer to get the hang of things as I previously used a GUI builder which someone in this community pointed out to me is not good to start with (very correct!)
The issue lies in your GUI class when you call getContentPane().setLayout(null). Because of this method call, your JFrame is not displaying anything. If you remove it, your elements should show up.
I also noticed that you were setting each JButton to have a constraint of BorderLayout.WEST. This will most likely put your JButtons on top of each other and render only one of them.
I'm fairly new to JFrame and I want to know why my items are not showing up on the window. I know i dont have a ActionHandler but I just want my textfield's to show up on my window. Here's my code:
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class FirstGUI extends JFrame{
public void GUI(){
setTitle("Welcome");
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setSize(600,600);
JLabel title = new JLabel();
title.setText("Apple Inc. Member Login Port");
title.setFont(new Font("Arial", Font.PLAIN, 24));
JTextField login = new JTextField("Login",10);
JPasswordField pass = new JPasswordField("Password");
add(title);
add(login);
add(pass);
}
public static void main(String[] args){
FirstGUI a = new FirstGUI();
a.GUI();
}
}
but when i run it i get this:
but when i run it i get this:
You get an empty screen because you add the components to the frame after the frame is visible.
As has already been suggested you need to use an appropriate layout manager. FlowLayout is the easiest to start with.
invoke setVisible(true) AFTER adding the components to the frame.
So the code should be more like:
panel.add(...);
panel.add(...);
add(panel);
pack();
setVisible(true);
I agree to MadProgrammer's suggestions (+1)
Well, lets take a look at your program though
You actually have created a JFrame with components in it. Its working fine as well, but your question of "why are my items not showing up in the JFrame" is not because you did something wrong but because missed out something i.e. revalidate()
Try:
public static void main(String[] args){
FirstGUI a = new FirstGUI();
a.GUI();
a.revalidate();
}
I'm not saying this will give you perfect UI.. what I'm trying to say is this will help you understand the Swing better. Learn about Swing Layout managers and then work on your UI to have better results
revalidate(): This component and all parents above it are marked as needing to be laid out. This means the Layout Manager will try to realign the components. Often used after removing components. It is possible that some really sharp swing people may miss this. I would think that you will only know this if you are actually using Swing.
The default layout manager for JFrame is BorderLayout.
This means that your components are essentially all been added ontop of each other.
Try changing the layout manager to something like FlowLayout (for example)...
Take a look at A Visual Guide to Layout Managers and Using Layout Managers for more details.
Also, avoid setSize where possible, use Window#pack instead
Update
I'd also like to introduce you to Initial Threads which should be used to launch your UI code...
The only one reason :
setVisible(True); method for the frame should be put on the end of the code.
if you give this line on the top of the code that is when you create a frame. This will cause that problem.
Don't add the components directly to your frame. Instead add to the content pane, which is where a JFrame stores all of the components that it draws. Usually this is a JPanel.
Here is an example:
public class GUI
{
private JPanel content;
public void GUI
{
/*Other code*/
content = new JPanel();
add(content); //make content the content pane
content.add(title);
content.add(login);
content.add(pass);
}
If that fails, call setVisible(true) and setEnabled(true) on all of your components.
On a side note you may want to make your GUI function a constructor.
import javax.swing.*;
import java.awt.*;
class Myframec extends JFrame
{
Myframec()
{
Container c = this.getContentPane();
c.setLayout(null);
this.setBounds(10,10,700,500);
this.setTitle("Welcome");
this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setBounds(0,0,700,500);
panel.setBackground(Color.gray);
panel.setLayout(null);
c.add(panel);
Font f = new Font("Arial",Font.BOLD,25);
Font f1 = new Font("Arial",Font.BOLD,20);
JLabel lable = new JLabel();
lable.setBounds(130,10,400,100);
lable.setText("Apple Inc. Member Login Port");
lable.setFont(f);
panel.add(lable);
JTextField login = new JTextField("Login",10);
login.setBounds(120,150,400,30);
login.setFont(f1);
panel.add(login);
JPasswordField pass =new JPasswordField("Password");
pass.setBounds(120,200,400,30);
pass.setFont(f1);
lable.setFont(f);
panel.add(pass);
c.setVisible(true);
this.setVisible(true);
}
public static void main(String[] argm)
{
Myframec frame = new Myframec();
frame.setVisible(true);
}
}
I am using swing in Java and I need to create a JButton and put it in a JPanel.
I reed tutorials and I did this:
public void crearNuevaMiga(String nombre)
{
JButton nuevo = new JButton(nombre);
this.MigasDePan.add(nuevo);
nuevo.setVisible(true);
nuevo.setLocation(new Point(migaX, migaY));
System.out.println(nuevo.getLocation().x + " "+ nuevo.getLocation().y);
migaX = migaX-avanceMigas;
}
I do that and when I call the function, I cant see the button. I put a button with the designer of NetBeans and get X and Y Location. Then, in the variables migaX and migaY I put that X and Y Location, so the button need to be in the same position, but it is not there.
Anyone knows why? Maybe putting the location in that way is not correct?
Thanks for your time!
EDIT: MigasDePan is my JPanel
Here's a simple example of putting a JButton in a JPanel, and putting the JPanel in a JFrame. I created this code without using any GUI builder.
I called the SwingUtilities invokeLater method in the main method to put the creation and use of the Swing components on the Event Dispatch thread. Oracle and I insist that you start every Swing application on the Event Dispatch thread.
I used a JFrame. You must call the JFrame methods in the order they are called in the run method.
I used a JPanel. I put the JButton in the middle of the JPanel, since it's the only component on the JPanel.
I used a Swing layout, the Border Layout. Different Swing layouts are used to create different Swing component layouts.
Here's the short, self-contained, runnable code.
package com.ggl.testing;
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class MyButton implements Runnable {
public static void main(String[] args) {
SwingUtilities.invokeLater(new MyButton());
}
#Override
public void run() {
JFrame frame = new JFrame("My Button");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(createMainPanel());
frame.pack();
frame.setVisible(true);
}
private JPanel createMainPanel() {
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
JButton myButton = new JButton("My Button");
panel.add(myButton);
return panel;
}
}
By default components have a size of (0, 0) so there is nothing to paint.
When you dynamically add a button to a visible GUI you need to invoke the layout manager so the components size/location can be determined by the layout manager.
The basic code is:
panel.add(...);
panel.revalidate();
panel.repaint();
I'm fairly new to JFrame and I want to know why my items are not showing up on the window. I know i dont have a ActionHandler but I just want my textfield's to show up on my window. Here's my code:
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class FirstGUI extends JFrame{
public void GUI(){
setTitle("Welcome");
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setSize(600,600);
JLabel title = new JLabel();
title.setText("Apple Inc. Member Login Port");
title.setFont(new Font("Arial", Font.PLAIN, 24));
JTextField login = new JTextField("Login",10);
JPasswordField pass = new JPasswordField("Password");
add(title);
add(login);
add(pass);
}
public static void main(String[] args){
FirstGUI a = new FirstGUI();
a.GUI();
}
}
but when i run it i get this:
but when i run it i get this:
You get an empty screen because you add the components to the frame after the frame is visible.
As has already been suggested you need to use an appropriate layout manager. FlowLayout is the easiest to start with.
invoke setVisible(true) AFTER adding the components to the frame.
So the code should be more like:
panel.add(...);
panel.add(...);
add(panel);
pack();
setVisible(true);
I agree to MadProgrammer's suggestions (+1)
Well, lets take a look at your program though
You actually have created a JFrame with components in it. Its working fine as well, but your question of "why are my items not showing up in the JFrame" is not because you did something wrong but because missed out something i.e. revalidate()
Try:
public static void main(String[] args){
FirstGUI a = new FirstGUI();
a.GUI();
a.revalidate();
}
I'm not saying this will give you perfect UI.. what I'm trying to say is this will help you understand the Swing better. Learn about Swing Layout managers and then work on your UI to have better results
revalidate(): This component and all parents above it are marked as needing to be laid out. This means the Layout Manager will try to realign the components. Often used after removing components. It is possible that some really sharp swing people may miss this. I would think that you will only know this if you are actually using Swing.
The default layout manager for JFrame is BorderLayout.
This means that your components are essentially all been added ontop of each other.
Try changing the layout manager to something like FlowLayout (for example)...
Take a look at A Visual Guide to Layout Managers and Using Layout Managers for more details.
Also, avoid setSize where possible, use Window#pack instead
Update
I'd also like to introduce you to Initial Threads which should be used to launch your UI code...
The only one reason :
setVisible(True); method for the frame should be put on the end of the code.
if you give this line on the top of the code that is when you create a frame. This will cause that problem.
Don't add the components directly to your frame. Instead add to the content pane, which is where a JFrame stores all of the components that it draws. Usually this is a JPanel.
Here is an example:
public class GUI
{
private JPanel content;
public void GUI
{
/*Other code*/
content = new JPanel();
add(content); //make content the content pane
content.add(title);
content.add(login);
content.add(pass);
}
If that fails, call setVisible(true) and setEnabled(true) on all of your components.
On a side note you may want to make your GUI function a constructor.
import javax.swing.*;
import java.awt.*;
class Myframec extends JFrame
{
Myframec()
{
Container c = this.getContentPane();
c.setLayout(null);
this.setBounds(10,10,700,500);
this.setTitle("Welcome");
this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setBounds(0,0,700,500);
panel.setBackground(Color.gray);
panel.setLayout(null);
c.add(panel);
Font f = new Font("Arial",Font.BOLD,25);
Font f1 = new Font("Arial",Font.BOLD,20);
JLabel lable = new JLabel();
lable.setBounds(130,10,400,100);
lable.setText("Apple Inc. Member Login Port");
lable.setFont(f);
panel.add(lable);
JTextField login = new JTextField("Login",10);
login.setBounds(120,150,400,30);
login.setFont(f1);
panel.add(login);
JPasswordField pass =new JPasswordField("Password");
pass.setBounds(120,200,400,30);
pass.setFont(f1);
lable.setFont(f);
panel.add(pass);
c.setVisible(true);
this.setVisible(true);
}
public static void main(String[] argm)
{
Myframec frame = new Myframec();
frame.setVisible(true);
}
}
I want to make a loading message when an app processes, so I used a JPanel over a JTree. But when the user clicks on the JPanel, the JTree will be selected and the JPanel will go to the back. After hiding the JPanel, it never shows again. I don't know why, but it seems it never go in front of the JTree.
I need a way to bring the JPanel in front of everything. How can I do this?
EDIT: Also I must mention that I don't want a JDialog. I want to use the JPanel on top of any element to show a loading message until a process finishes.
So here you have at least two solutions. Either go with what #Geoff and #sthupahsmaht are suggesting. BTW also possible is to use JOptionPane which automatically creates a dialog for you.
The other option would be to use a GlassPane from a frame.
Or yet another option is to use JLayeredPane as #jzd suggests.
EDIT:
Example showing how to use GlassPane to capture user selections.
Try following steps:
1.Left clicking on the glass pane visible at start. See the output.
2.Right click it. This hides the glass pane.
3.Left clicking on the content pane. See the output.
4.Right click it. Go to point 1.
Enjoy.
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class OverPanel extends JPanel
{
private static void createAndShowGUI()
{
final JFrame f = new JFrame();
f.setPreferredSize(new Dimension(400, 300));
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel glassPanel = new JPanel();
glassPanel.setBackground(Color.RED);
glassPanel.addMouseListener(new MouseAdapter()
{
#Override
public void mousePressed(MouseEvent e)
{
super.mousePressed(e);
System.out.println("f.getGlassPane() mousePressed");
if(e.getButton() == MouseEvent.BUTTON3)
f.getGlassPane().setVisible(false);
}
});
f.setGlassPane(glassPanel);
f.getContentPane().setBackground(Color.GREEN);
f.getContentPane().addMouseListener(new MouseAdapter()
{
#Override
public void mousePressed(MouseEvent e)
{
super.mousePressed(e);
System.out.println("f.getContentPane() mousePressed");
if(e.getButton() == MouseEvent.BUTTON3)
f.getGlassPane().setVisible(true);
}
});
f.getGlassPane().setVisible(true);
f.pack();
f.setVisible(true);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
#Override
public void run()
{
createAndShowGUI();
}
});
}
}
EDIT2:
If you want to have an effect of a dialog, you can achieve it by incorporating appropriately this code into my example.
JPanel panel = new JPanel(new GridLayout(0, 1));
panel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
panel.setBackground(Color.YELLOW);
panel.add(new JLabel("I am message Label"));
panel.add(new JButton("CLOSE"));
JPanel glassPanel = new JPanel(new GridBagLayout());
glassPanel.setOpaque(false);
glassPanel.add(panel);
You need a to use a JLayeredPane for moving components in front of each other.
Here is a tutorial: How to use Layered Panes
Disabled Glass Pane might help you out.
It's not really clear how your code is organized. However, it sounds like what you might want is a modal dialog. Here's a link to a similar discussion with a number of referenced resources.
How to make a JFrame Modal in Swing java
Use JXLayer or JIDE Overlayable.
Jpanel main = new JPanel();
Jpanel a = new JPanel();
JPanel b = new Jpanel();
main.add(a);
main.add(b);
at this point the object:
a -> 0 ( index)
b -> 1 (index)
main.getComponentCount() = 2
main.setComponentZorder(b,0);
a -> 1
b -> 0;
b OVER
a DOWN
For those who have no problem using a JDialog, this is a sure way to get it to show up if you're having issues. Just make sure to control it properly if the dialog is modal, when disposing, setting focus etc.
JDialog dialog = new JDialog();
dialog.setAlwaysOnTop(true);