I am creating a tab pain in a Class called Dashboard which holds 'filler' panels in the tabs. I am wondering if there is a way to create a new Dashboard and change the panels that I stored in the tabs. I'm not sure if this is the right way to explain it, but here is some code.
public class Dashboard{
public Dashboard(){
tabPane = new JTabbedPane();
panel1 = new JPanel();
panel2 = new JPanel();
panel3 = new JPanel();
panel1.add(new JLabel("This is the first panel"));
panel2.add(new JLabel("This is the second panel"));
panel3.add(new JLable("This is the third panel"));
tabPane.add("One", panel1);
tabPane.add("Two", panel2);
tabPane.add("Three", panel3);
}
I now want to make a new class that creates and instance of the Dashboard, but changes what panels show up in the tabs. I was trying something like this:
public class Changer{
public Changer(){
Dashboard d = new Dashboard();
// assuming I have getters and setters in the above class and that the
// panels are fields in Dashboard
JPanel new = new JPanel();
d.setPanel1(new);
}
}
I'm not sure if this is possible or if there is another way of doing so.
Get the index of tab
int index = tabPane.indexOfTab("One");
Set the component at the specified index
tabPane.setComponentAt(index, new Dashboard());
Related
I am trying to make a GUI for a game. I am very new to Java, especially GUI. The code below is a snippet which is supposed to make a JFrame with nested panels for organization. It works until I add buttons to the button panel. They end up on the boardBckg panel. If I manage to place them on the correct panel the JTextField disappears or it takes up the entire screen. I have been working on this part of the code for the past two days and I could really use GUI tips.
private void makeWindow()
{
boardPanel = new JPanel();
boardBckg = new JPanel();
menuPanel = new JPanel();
save = new JButton("Save");
save.setSize(Buttons);
load = new JButton("Load");
load.setSize(Buttons);
replay = new JButton ("Replay");
replay.setSize(Buttons);
words = new JTextField();
frame = new JFrame(title);
boardPanel.setSize(PANEL);
boardPanel.setMaximumSize(MAX);
boardPanel.setMinimumSize(MIN);
boardPanel.setLayout(new GridLayout(m,n));
boardBckg.setSize(1000, 1000);
boardBckg.setBackground(Color.cyan);
boardBckg.add(boardPanel, BorderLayout.CENTER);
frame.setSize(1500, 1000);
frame.setResizable(false);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BoxLayout vertical = new BoxLayout(menuPanel, BoxLayout.Y_AXIS);
menuPanel.setSize(500, 1000);
menuPanel.setBackground(Color.blue);
menuPanel.setLayout(vertical);
frame.add(boardBckg);
frame.add(menuPanel);
JPanel iGiveUp = new JPanel();
iGiveUp.setBackground(Color.black);
JPanel buttons = new JPanel();
buttons.setBackground(Color.darkGray);
buttons.add(save);
buttons.add(load);
buttons.add(replay);
menuPanel.add(iGiveUp);
menuPanel.add(buttons);
iGiveUp.add(words);
boardBckg.add(boardPanel, BorderLayout.CENTER);
The default layout of a JPanel is the FlowLayout. You can't just specify a BorderLayout constraint when you add the component to the panel.
frame.add(boardBckg);
frame.add(menuPanel);
The default layout for (the content pane of) the frame is a BorderLayout. If you don't specify a constraint, then the component is added to the BorderLayout.CENTER. Problem is only one component can be added to the CENTER so you only see the last comoponent added.
frame.setVisible(true);
Component should be added to the frame BEFORE the frame is packed and made visible. So the above statement should be the last statement in your constructor.
I have no ideas what your desired layout is but you need to start with something simple and take advantage of the default BorderLayout of the frame.
So your basic logic might be something like:
JPanel menuPanel = new JPanel()
menuPanel.setLayout(new BoxLayout(menuPanel, BoxLayout.Y_AXIS));
menuPanel.add(...);
menuPanel.add(...);
JPanel center = new JPanel();
center.setLayout(...);
center.setBackground( Color.BLUE );
center.add(...);
frame.add(menuPanel, BorderLayout.LINE_START);
frame.add(center, BorderLayout.CENTER);
frame.pack();
frame.setVisible( true );
The main point is to break the panels down logically and add them to the frame one at a time. So first get the menu and its child components added to the frame is the correct position. Then you can add the CENTER panel and its child components.
I have created a password generator in Java which works perfectly. My functionality is working (after a lot of tears, sweat and blood :) ), but the only problem that remains is the layout of my GUI.
My approach was the following:
1 pane (Top/North) for the title
1 pane in the center for the form
1 pane (bottom/south) for the buttons and textfield
This is the result
as you can see this is not how I wanted it. But if I look at my code, it should be placed nicely from top to bottom.
Where did it go wrong?
My code:
The constructor (extends from JFrame)
public PasswordGenerator(){
this.setContentPane(ContentPane());
this.setSize(500,270);
this.setResizable(true);
this.setVisible(true);
}
The panes:
private JPanel ContentPane()
{
JPanel ContentPane = new JPanel();
ContentPane.add(getTopPane(), BorderLayout.NORTH);
ContentPane.add(getCenterPane(),BorderLayout.CENTER);
ContentPane.add(getSouthPane(),BorderLayout.EAST);
return ContentPane;
}
private JPanel getTopPane(){
JPanel TopPane = new JPanel();
JLabel intro = new JLabel("Password generator V1.0");
intro.setFont(new Font("TimesRoman",Font.BOLD,20));
TopPane.setLayout(new GridLayout(1,1));
TopPane.add(intro);
return TopPane;
}
private JPanel getCenterPane(){
JPanel CenterPane = new JPanel();
CenterPane.add(aantalChars);
CenterPane.setLayout(new GridLayout(6,3));
//8,2
hidden.setVisible(false);
hiddenL.setVisible(false);
CenterPane.add(aantalCharsLabel);
CenterPane.add(hidden);
CenterPane.add(hidden);
CenterPane.add(hiddenL);
CenterPane.add(lowerCase);
CenterPane.add(lowerCaseLabel);
CenterPane.add(upperCase);
CenterPane.add(upperCaseLabel);
CenterPane.add(numberCase);
CenterPane.add(numberCaseLabel);
CenterPane.add(symbolCase);
CenterPane.add(symbolCaseLabel);
return CenterPane;
}
You forgot to set the BorderLayout as LayoutManager on your ContentPane. Just using the right constraints is not enough. You can use ContentPane.setLayoutManager() for this, or you can give the LayoutManager directly in the constructor of JPanel.
The default layout manager for JPanel is FlowLayout manager.
To use BorederLayout you need to set it specifically :
private JPanel ContentPane()
{
JPanel ContentPane = new JPanel();
//////////////////////////////////////////////
ContentPane.setLayout(new BorderLayout());
////////////////////////////////////////////
ContentPane.add(getTopPane(), BorderLayout.NORTH);
ContentPane.add(getCenterPane(),BorderLayout.CENTER);
ContentPane.add(getSouthPane(),BorderLayout.SOUTH);
return ContentPane;
}
I am trying to achieve the following effect in Java:
However, I am not sure what layout to use and how. FlowLayout obviously doesn't work. GridLayout won't work either because the first 4 rows are supposed to be 1 column rows, but the 5th row needs to have 2 columns.
This is my code so far:
public class DepositPanel extends JPanel
{
private JLabel cashL, checksL;
private JTextField cashTF, checksTF;
private JButton ok, cancel;
DepositPanel()
{
JPanel depositP = new JPanel();
depositP.setLayout(new FlowLayout(FlowLayout.LEFT, 2, 2));
depositP.setPreferredSize(new Dimension(250, 85));
JTextField cashTF = new JTextField(22);
JTextField checksTF = new JTextField(22);
JLabel cashL = new JLabel("Cash:");
JLabel checksL = new JLabel("Checks:");
ok = new JButton("OK");
cancel = new JButton("CANCEL");
depositP.add(cashL);
depositP.add(cashTF);
depositP.add(checksL);
depositP.add(checksTF);
depositP.add(ok);
depositP.add(cancel):
}
}
You could try with combinations of Layouts, 2 JPanels, 1 for buttons and 1 for fields, button panel with FlowLayout and fields panel with BoxLayout. And adding them to the frame. (I did a JFrame for testing, but you can change it to a JPanel and add that panel to your JFrame). Just be sure to have only 1 JFrame, see The use of multiple JFrames, Good / Bad Practice.
For example:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class DepositExample {
JFrame frame;
JPanel buttonPane, fieldsPanel;
JLabel cash, checks;
JTextField cashField, checksField;
JButton ok, cancel;
DepositExample() {
frame = new JFrame("Deposit");
buttonPane = new JPanel();
fieldsPanel = new JPanel();
cash = new JLabel("Cash");
checks = new JLabel("Checks");
cashField = new JTextField("");
checksField = new JTextField("");
ok = new JButton("OK");
cancel = new JButton("Cancel");
fieldsPanel.setLayout(new BoxLayout(fieldsPanel, BoxLayout.PAGE_AXIS));
buttonPane.setLayout(new FlowLayout());
fieldsPanel.add(cash);
fieldsPanel.add(cashField);
fieldsPanel.add(checks);
fieldsPanel.add(checksField);
buttonPane.add(ok);
buttonPane.add(cancel);
frame.add(fieldsPanel, BorderLayout.PAGE_START);
frame.add(buttonPane, BorderLayout.PAGE_END);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
public static void main(String args[]) {
new DepositExample();
}
}
To get some more spacing between components you can add EmptyBorders as recommended by #LuxxMiner in his comment below.
In this case you can use a JOptionPane to build a simple panel for you:
JTextField firstName = new JTextField(10);
JTextField lastName = new JTextField(10);
Object[] msg = {"First Name:", firstName, "Last Name:", lastName};
result = JOptionPane.showConfirmDialog(
frame,
msg,
"Use default layout",
JOptionPane.OK_CANCEL_OPTION,
JOptionPane.PLAIN_MESSAGE);
if (result == JOptionPane.YES_OPTION)
{
System.out.println(firstName.getText() + " : " + lastName.getText());
}
else
{
System.out.println("Canceled");
}
The only problem with this approach is that the focus will be on a button, not the first name text field.
So to solve this problem you can check out the RequestFocusListener found in Dialog Focus which will cause focus to be placed on the first name text field once the dialog is displayed.
JTextField firstName = new JTextField(10);
firstName.addAncestorListener( new RequestFocusListener() );
Although for more complex layouts it is better to create one or more panels each using an appropriate layout manager for the requirement.
There are many ways to achieve a layout like this. The first thing you need to get used to, is that its often simpler to split up different requirements into different containers using different layout managers.
If you separate the two buttons into their own panel and treat that panel with the buttons as "just another line" in the window, you can basically just use a GridLayout with a single column. The panel with the buttons could then use a FlowLayout to place the buttons side by side.
Try this:
public class Window extends JFrame{
....
}
JLabel example;
//Constructor
public Window(){
example = new JLabel("Sample text");
example.setBounds(x,y,width,height)
//JComponent...
setLayout(null);
setSize(width,height);
setVisible(true);
}
Without the JPanel you can specify the x and y coordinates
I am working with Swing, trying to learn how to use it. I am doing an excercise in my book where I am supposed to make buttons (JButtons) like the ones a dvd-player has. I am adding no funcionality to the buttons at this point. The program worked just fine when I first ran it. Then I thought that I would expand it by making a second panel (JPanel) with the same buttons. When I run my code however, I just get one set of buttons (not two areas with two sets of buttons).
Have I misunderstood the concept of Panels? I have understood a Panel to be an area (a container) in my frame where I can display different output, and that I can have several panels i one frame.
Here is my code:
import javax.swing.*;
public class Oppgave91 extends JFrame
{
public Oppgave91()
{
super ("We make buttons");
setDefaultCloseOperation(EXIT_ON_CLOSE);
JButton play = new JButton("Play");
JButton stopeject = new JButton("Stop/Eject");
JButton rewind = new JButton("Rewind");
JButton fastforward = new JButton("FastForward");
JButton pause = new JButton("Pause");
JPanel panel = new JPanel();
panel.add(play);
panel.add(stopeject);
panel.add(rewind);
panel.add(fastforward);
panel.add(pause);
JPanel panel2 = new JPanel();
panel2.add(play);
panel2.add(stopeject);
panel2.add(rewind);
panel2.add(fastforward);
panel2.add(pause);
add(panel);
add(panel2);
setVisible(true);
}
public static void main(String[] args)
{
Oppgave91 showbuttons = new Oppgave91();
showbuttons.pack();
}
}
A component can have only 1 parent. See the last line of my code snippet for how it should be done
JPanel panel = new JPanel();
panel.add(play);
panel.add(stopeject);
panel.add(rewind);
panel.add(fastforward);
panel.add(pause);
//right now panel is the parent component of play, stop, eject
JPanel panel2 = new JPanel();
panel2.add(play); //play is now owned by panel2, not panel
panel2.add(stopeject); //stopeject is now owned by panel2, not panel
panel2.add(new JButton("Rewind")); // this is how you should do this
I'm new to Java and the entire swing development. I'm working on a Window with three tabs and adding each component to those tabs. I started by adding a textfield to the 3rd tab, but it's taking up the entire tab. I'm sure if I add other components it will make room, but isn't there a way to make it so it doesn't initially take up the entire Tabbed Pane?
package literature.windows;
import java.awt.*;
import javax.swing.*;
public class MainWindow extends JFrame {
JPanel storiesPanel = new JPanel();
JPanel plotPanel = new JPanel();
JPanel charactersPanel = new JPanel();
JTextField addCharacterTextField = new JTextField("Enter Character's Name", 25);
public MainWindow() {
setSize(800, 600);
JTabbedPane tabs = new JTabbedPane();
tabs.addTab("Stories", storiesPanel);
tabs.addTab("Plot", plotPanel);
tabs.addTab("Characters", charactersPanel);
add(tabs);
tabs.setTabComponentAt(2, addCharacterTextField);
setVisible(true);
}
}
You are currently setting the entire tab component for that tab. Instead you need to add the JTextField to the container/panel for that tab. Replace
tabs.setTabComponentAt(2, addCharacterTextField);
with
charactersPanel.add(addCharacterTextField);