I have a Swing application using Card Layout which basically changes the displayed panel depending on what the user selects from a drop-down menu.
One of my panels has a form. I would need for when the submit buton is pressed for all the inputs to be collected and the Panel to be switched to another one. (This second panel is defined in a separate class) I would also need for all the input to be somehow passed to a method in the new panel.
Any suggestions?
Dario
If you look at the <--s in the following code, each should solve each different question you have in your post. I figured you should know how to make a submit button, so I didn't include that. (Note: this is not running code, just suggestions);
public class MainPanel entends JPanel {
CardLayout layout = new CardLayout(); <-- card layout
JPanel panel = new JPanel(layout); <-- set layout to main panel
NewPanel newPanel = new NewPanel(); <-- you new panel
JPanel p1 = new JPanel(); <-- random panel
JTextField text = new JTextField() <-- text field in form
JButton button = new JButton();
JComboBox cbox = new JComboBox(new String[] {"newPanel", "p1"}); <-- hold panel names
public MainPanel(){
panel.add(newPanel, "newPanel"); <-- name associated with panel
panel.add(p1, "p1");
...
cbox.addAItemListener(new ItemListener(){
public void itemStateChnaged(ItemEvent e){
layout.show(panel, (string).getItem()); <-- show Panel from combobox
}
});
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String txt = text.getText();
newPanel.printText(txt); <-- Using method from other class
}
});
}
}
public class NewPanel extends JPanel {
public void printText(String text){ <-- method from other class
System.out.println(text);
}
}
Related
I have a JPanel which consists of a dropdown and a text field inside my JFrame. There is a button in my JFrame, when user clicks on that button, application adds new JPanel with the same components i.e. drop down and a text field. So, for this I have created a function which gets called on clicking on the button using ActionListener.
Everything works fine from GUI side but the problem is when user is done with adding JPanels and entering the values in these drop downs and text fields, it will click on Submit button. Upon clicking on Submit button, I should be able to fetch the values from all drop downs and text fields. This is a challenge, since I am using the same functions to create JPanels, I can't call its name to get the values since that will give me the last JPanel values.
Any suggestion how I should go about this? I have added the screenshot of my JFrame and the function to create the JPanel. Any help is appreciated. Thanks.
public static void AddPanel(final Container pane) {
panel1 = new JPanel();
String text = "<html><b>Property" + nooftimes + " :</b></html>";
JLabel label = new JLabel(text);
label.setPreferredSize(new Dimension(80, 30));
panel1.add(label);
panel1.add(new JLabel("Please enter the property"));
DefaultComboBoxModel<String> model = new DefaultComboBoxModel<String>();
model.addElement("value1");
model.addElement("value2");
model.addElement("value3");
model.addElement("value4");
model.addElement("value5");
final JComboBox<String> comboBox1 = new JComboBox<String>(model);
AutoCompleteDecorator.decorate(comboBox1);
comboBox1.setPreferredSize(new Dimension(120, 22));
panel1.add(comboBox1);
final JTextField txtfield1 = new JTextField(
"Please enter your value here");
txtfield1.setPreferredSize(new Dimension(200, 22));
panel1.add(txtfield1);
txtfield1.addFocusListener(new FocusListener() {
public void focusGained(FocusEvent e) {
txtfield1.setText("");
}
public void focusLost(FocusEvent e) {
// nothing
}
});
container.add(panel1);
nooftimes++;
frame.revalidate();
frame.validate();
frame.repaint();
}
Screenshot:
}
You could return the JPanel and store it in a List<JPanel>. When you click your submit-Button you are able to iterate through the JPanels and its Components.
public class Application {
private static List<JPanel> panels = new ArrayList<>();
private static Container someContainer = new Container();
public static void main(String[] args) {
panels.add(addPanel(someContainer));
panels.add(addPanel(someContainer));
panels.add(addPanel(someContainer));
submit();
}
public static JPanel addPanel(final Container pane) {
JPanel panel1 = new JPanel();
// shortened code
final JComboBox<String> comboBox1 = new JComboBox<String>();
panel1.add(comboBox1);
final JTextField txtfield1 = new JTextField("Please enter your value here");
txtfield1.setText(String.valueOf(Math.random()));
panel1.add(txtfield1);
return panel1;
}
private static void submit() {
for (JPanel panel : panels) {
Component[] components = panel.getComponents();
for (Component comp : components) {
// Cast comp to JComboBox / JTextField to get the values
if (comp instanceof JTextField) {
JTextField textField = (JTextField) comp;
System.out.println(textField.getText());
}
}
}
}
}
You could simply have a class (extending JPanel) with specific methods to add your components , and to get inputs from user (i.e. get the combo box selected index and text from textfield ).
Every time you add a panel, you don't call a static method, but you create an instance of this class, keeping the reference somewhere (for example adding it to an arraylist).
But you could consider a different scenario: personally i don't like to add components "on fly", you could have a component (for example another JComboBox), where user can select the number of values he needs.
You decide a default value (for example 4), so at the beginning you create 4 panels of your class, and you can use a simple array containing them.
If the user changes the number of panels, you could dispose frame and create a new one.
Of course this solution does not woork good if you want to keep inputs inserted, or if the frame construction takes a lot of time.
Here there is a screenshot of a gui i created: user can select the number of partials, when the choice changes i just recreate the panels below,containing the textfields (which are memorized in a two-dimensional array).
I'm working on an assignment for class where we need to create a JComboBox and each option opens a new window where you can do whatever you want on those new windows. Please keep in mind I'm very new to GUI and new to Java in general, in case my questions are dumb.
I have a question and an issue...
My question:
When the user selects "The Matrix" option a new window pops up with a quote and two buttons. Right now I have two JPanels (panel and panel2) panel adds the quote to the NORTH position and then panel2 adds the two buttons to the CENTER position both using BorderLayout. My question is am I doing this correctly...Could I use just panel to add the quote and the buttons or is it necessary to create separate panels for separate items being added to the JFrame? When I had them both added to the same panel the quote was not on the window when I ran the program.
panel.add(matrixQuote);
newFrame.add(panel, BorderLayout.NORTH);
That's how I had it when it wasn't showing up ^^^
I GOT THE ISSUE WITH CLEARING THE JFRAME FIXED
I am trying to add an ActionListener to the bluePill button and instead of opening another new window I thought I could clear everything from the existing window when the button is pressed and then display something new on said window. The only info I could find on this is how I have it in the actionPerformed method below. I'll post a snippet of what I'm talking about directly below and then all my code below that just in case.
All my code...
public class MultiForm extends JFrame{
private JComboBox menu;
private JButton bluePill;
private JButton redPill;
private JLabel matrixQuote;
private int matrixSelection;
private JFrame newFrame;
private JPanel panel;
private JPanel panel2;
private static String[] fileName = {"", "The Matrix", "Another Option"};
public MultiForm() {
super("Multi Form Program");
setLayout(new FlowLayout());
menu = new JComboBox(fileName);
add(menu);
TheHandler handler = new TheHandler();
menu.addItemListener(handler);
}
public void matrixPanel() {
TheHandler handler = new TheHandler();
//Create a new window when "The Matrix" is clicked in the JCB
newFrame = new JFrame();
panel = new JPanel();
panel2 = new JPanel();
newFrame.setLayout(new FlowLayout());
newFrame.setSize(500, 300);
newFrame.setDefaultCloseOperation(newFrame.EXIT_ON_CLOSE);
matrixQuote = new JLabel("<html>After this, there is no turning back. "
+ "<br>You take the blue pill—the story ends, you wake up "
+ "<br>in your bed and believe whatever you want to believe."
+ "<br>You take the red pill—you stay in Wonderland, and I show"
+ "<br>you how deep the rabbit hole goes. Remember: all I'm "
+ "<br>offering is the truth. Nothing more.</html>");
panel2.add(matrixQuote);
newFrame.add(panel2, BorderLayout.NORTH);
//Blue pill button and picture.
Icon bp = new ImageIcon(getClass().getResource("Blue Pill.png"));
bluePill = new JButton("Blue Pill", bp);
panel2.add(bluePill);
bluePill.addActionListener(handler);
//Red pill button and picture
Icon rp = new ImageIcon(getClass().getResource("Red Pill.png"));
redPill = new JButton("Red Pill", rp);
panel2.add(redPill);
newFrame.add(panel2, BorderLayout.CENTER);
newFrame.setVisible(true);
}
private class TheHandler implements ItemListener, ActionListener{
public void itemStateChanged(ItemEvent IE) {
//listen for an item to be selected.
if(IE.getStateChange() == ItemEvent.SELECTED) {
Object selection = menu.getSelectedItem();
if("The Matrix".equals(selection)) {
matrixPanel();
}
else if("Another Option".equals(selection)) {
}
}
}
public void actionPerformed(ActionEvent AE) {
if(AE.getSource() == bluePill) {
newFrame.remove(panel);
newFrame.remove(panel2);
newFrame.repaint();
}
}
}
//MAIN
public static void main(String[] args) {
MultiForm go = new MultiForm();
go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
go.setSize(400, 200);
go.setVisible(true);
}
}
Use a Card Layout. You can swap panels as required.
The tutorial has a working example.
You can use:
jpanel.removeAll();
Either to delete a certain JComponent by using the JComponent itself like:
JFrame frame = new JFrame();
JPanel panel = new JPanel();
frame.add(panel);
frame.remove(panel);
panel.getGraphics().clearRect(0, 0, panel.getWidth(), panel.getHeight());
I have created a JScrollPane with a JPanel inside it and I want to add JPanel/JLabel/Other objects after pressing the button. For example after three button presses I want to get something like this:
I tried myJPane.add(testLabel) with testlabel.setBounds()but no result, I don't want to use GridLayout because of the unchangeable sizes. I would like it if the added objects had different sizes - adjusted to the text content.
What should I use for it and how?
Thanks in advance.
Best regards,
Tom.
Here is a JPanel inside a JScrollPane that adds JLabels to it when pressing the button:
public class Example extends JFrame {
public Example() {
JPanel boxPanel = new JPanel();
boxPanel.setLayout(new BoxLayout(boxPanel, BoxLayout.PAGE_AXIS));
JTextField textField = new JTextField(20);
JButton sendButton = new JButton("Send");
sendButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
JLabel label = new JLabel(textField.getText());
label.setOpaque(true);
label.setBackground(Color.RED);
boxPanel.add(label);
boxPanel.add(Box.createRigidArea(new Dimension(0,5)));
textField.setText("");
boxPanel.revalidate();
// pack();
}
});
JPanel southPanel = new JPanel();
southPanel.add(textField);
southPanel.add(sendButton);
add(new JScrollPane(boxPanel));
add(southPanel, BorderLayout.PAGE_END);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String[] args) {
new Example();
}
}
The BoxLayout will stack the labels on top of each other.
Notes:
setOpaque(true) must be called on label for it to honor the background color.
Box.createRigidArea is used for creating gaps. Use it as you wish.
The call to revalidate() is imperative in order to display the new components immediately.
Calling pack() (on the JFrame) will resize it each time to fit all the new components. I just put it there for demonstration since the initial frame size is too small to display the initial components added.
I will use a BoxLayout, creating a vertical box, and after each button action, it will add a new JPanel to this box.
Example:
public class YourChat extends JPanel{
private JScrollPane sc;
private Box bv;
public YourChat(){
bv = Box.createVerticalBox();
sc = new JScrollPane(bv);
//your functions (panel creation, addition of listeners, etc)
add(sc);
}
//panel customized to have red backgroud
private class MyPanel extends JPanel(){
private JLabel label=new JLabel();
public MyPanel(String text){
setBackgroundColor(Color.red);
add(label);
}
}
//inside the action listener
public void actionPerformed(ActionEvent e) {
sc.add(new MyPanel(textField.getText()));
textField.setText("");
}
}
For extra information check on:
[https://docs.oracle.com/javase/tutorial/uiswing/layout/box.html]
See also the example
[http://www.java2s.com/Code/Java/Swing-JFC/VerticalandhorizontalBoxLayouts.htm]
Use BoxLayout if you want only add vertically, otherwise you can use FlowLayout for both directions.
i am trying to create GUI using java swings.I am just a beginner in java swings.
My primary idea was to create two tabs and add a button in one of the tabs.
I wanted to write a separate class for each tab so i created 3 classes out of which one has the main method.and the other two represent the tabs.
In one of the tabs i wanted to add a button in middle and add an action listener to that button.
below is the class which has the main method.
public class abc {
JFrame frame;
JTabbedPane tabPane;
ImageIcon close;
Dimension size;
int tabCounter = 0;
abc_export exp;
abc_import imp;
public static void main(String[] args) {
abc jtab = new abc();
jtab.start();
}
public void start(){
exp=new abc_export();
imp=new abc_import();
tabPane.addTab(null, exp.panel);
tabPane.addTab(null, imp.panel);
tabPane.setTabComponentAt(tabPane.getTabCount()-1, exp.tab);
tabPane.setTabComponentAt(tabPane.getTabCount()-1, imp.tab);
}
public abc() {
// Create a frame
frame = new JFrame();
// Create the tabbed pane.
tabPane = new JTabbedPane();
// Create a button to add a tab
// Create an image icon to use as a close button
close = new ImageIcon("C:/JAVAJAZZUP/tabClose.gif");
size = new Dimension(close.getIconWidth()+1, close.getIconHeight()+1);
//Adding into frame
frame.add(tabPane, BorderLayout.CENTER);
frame.setSize(300, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
};
below is code for one of the tabs.although the other tab is also having the same code which represent other tab with different class name.
public class abc_import {
ImageIcon close;
Dimension size;
int tabCounter = 0;
JPanel tab;
final JPanel panel;
public abc_import() {
close = new ImageIcon("C:/JAVAJAZZUP/tabClose.gif");
size = new Dimension(close.getIconWidth()+1, close.getIconHeight()+1);
//Adding into frame
JLabel label = null;
panel = new JPanel();
// Create a panel to represent the tab
tab = new JPanel();
tab.setOpaque(false);
String str = "abc_import";
label = new JLabel(str);
tab.add(label, BorderLayout.WEST);
}
};
as expected both the tabs are created.But i am out of ideas about adding a button inside one of the tabs.
Now my question here is if i wanted to add a button in one of the tabs as i already said.what do i need to do?can anyone help me?
I'm not sure I understand your intent, but you might try the approach shown in the TabComponentsDemo, discussed in How to Use Tabbed Panes: Tabs With Custom Components.
A related example is shown here.
You can try by using setTabComponentAt method.
This methd has the parameter setTabComponentAt(int index, Component component), in which you just mention the component you want.
You can refer a link here.
I'm trying to make a little game that will first show the player a simple login screen where they can enter their name (I will need it later to store their game state info), let them pick a difficulty level etc, and will only show the main game screen once the player has clicked the play button. I'd also like to allow the player to navigate to a (hopefully for them rather large) trophy collection, likewise in what will appear to them to be a new screen.
So far I have a main game window with a grid layout and a game in it that works (Yay for me!). Now I want to add the above functionality.
How do I go about doing this? I don't think I want to go the multiple JFrame route as I only want one icon visible in the taskbar at a time (or would setting their visibility to false effect the icon too?) Do I instead make and destroy layouts or panels or something like that?
What are my options? How can I control what content is being displayed? Especially given my newbie skills?
A simple modal dialog such as a JDialog should work well here. The main GUI which will likely be a JFrame can be invisible when the dialog is called, and then set to visible (assuming that the log-on was successful) once the dialog completes. If the dialog is modal, you'll know exactly when the user has closed the dialog as the code will continue right after the line where you call setVisible(true) on the dialog. Note that the GUI held by a JDialog can be every bit as complex and rich as that held by a JFrame.
Another option is to use one GUI/JFrame but swap views (JPanels) in the main GUI via a CardLayout. This could work quite well and is easy to implement. Check out the CardLayout tutorial for more.
Oh, and welcome to stackoverflow.com!
Here is an example of a Login Dialog as #HovercraftFullOfEels suggested.
Username: stackoverflow Password: stackoverflow
import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;
import javax.swing.*;
public class TestFrame extends JFrame {
private PassWordDialog passDialog;
public TestFrame() {
passDialog = new PassWordDialog(this, true);
passDialog.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new TestFrame();
frame.getContentPane().setBackground(Color.BLACK);
frame.setTitle("Logged In");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
}
});
}
}
class PassWordDialog extends JDialog {
private final JLabel jlblUsername = new JLabel("Username");
private final JLabel jlblPassword = new JLabel("Password");
private final JTextField jtfUsername = new JTextField(15);
private final JPasswordField jpfPassword = new JPasswordField();
private final JButton jbtOk = new JButton("Login");
private final JButton jbtCancel = new JButton("Cancel");
private final JLabel jlblStatus = new JLabel(" ");
public PassWordDialog() {
this(null, true);
}
public PassWordDialog(final JFrame parent, boolean modal) {
super(parent, modal);
JPanel p3 = new JPanel(new GridLayout(2, 1));
p3.add(jlblUsername);
p3.add(jlblPassword);
JPanel p4 = new JPanel(new GridLayout(2, 1));
p4.add(jtfUsername);
p4.add(jpfPassword);
JPanel p1 = new JPanel();
p1.add(p3);
p1.add(p4);
JPanel p2 = new JPanel();
p2.add(jbtOk);
p2.add(jbtCancel);
JPanel p5 = new JPanel(new BorderLayout());
p5.add(p2, BorderLayout.CENTER);
p5.add(jlblStatus, BorderLayout.NORTH);
jlblStatus.setForeground(Color.RED);
jlblStatus.setHorizontalAlignment(SwingConstants.CENTER);
setLayout(new BorderLayout());
add(p1, BorderLayout.CENTER);
add(p5, BorderLayout.SOUTH);
pack();
setLocationRelativeTo(null);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
addWindowListener(new WindowAdapter() {
#Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
jbtOk.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if (Arrays.equals("stackoverflow".toCharArray(), jpfPassword.getPassword())
&& "stackoverflow".equals(jtfUsername.getText())) {
parent.setVisible(true);
setVisible(false);
} else {
jlblStatus.setText("Invalid username or password");
}
}
});
jbtCancel.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
setVisible(false);
parent.dispose();
System.exit(0);
}
});
}
}
I suggest you insert the following code:
JFrame f = new JFrame();
JTextField text = new JTextField(15); //the 15 sets the size of the text field
JPanel p = new JPanel();
JButton b = new JButton("Login");
f.add(p); //so you can add more stuff to the JFrame
f.setSize(250,150);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Insert that when you want to add the stuff in. Next we will add all the stuff to the JPanel:
p.add(text);
p.add(b);
Now we add the ActionListeners to make the JButtons to work:
b.addActionListener(this);
public void actionPerforemed(ActionEvent e)
{
//Get the text of the JTextField
String TEXT = text.getText();
}
Don't forget to import the following if you haven't already:
import java.awt.event*;
import java.awt.*; //Just in case we need it
import java.x.swing.*;
I hope everything i said makes sense, because sometimes i don't (especially when I'm talking coding/Java) All the importing (if you didn't know) goes at the top of your code.
Instead of adding the game directly to JFrame, you can add your content to JPanel (let's call it GamePanel) and add this panel to the frame. Do the same thing for login screen: add all content to JPanel (LoginPanel) and add it to frame. When your game will start, you should do the following:
Add LoginPanel to frame
Get user input and load it's details
Add GamePanel and destroy LoginPanel (since it will be quite fast to re-create new one, so you don't need to keep it memory).