I have a JPanel called pnlMain with a layout set to BorderLayout. Inside the panel are three JPanel added to PAGE_START, CENTER, and PAGE_END. Now, my requirement is if the Settings button is clicked, it will display a transparent JPanel above pnlMain. This transparent panel will then contain an opaque, smaller, centered panel, that will contain the settings stuff.
I know I can do this using JLayeredPane, but looking at the tutorial it says that you can only put components of different depth using absolute positioning which I'm aware is highly discouraged.
Is there some other way to do this without using absolute positioning?
You can use the glass pane of the parent frame, which will allow you to add components to it that will appear to overlaid over the main content.
Basically, I would, create a JPanel and set it to be transparent (setOpaque(false)). I would set it's layout manager to something like GridBagLayout (as it will use the preferred size of the child component and center it automatically within it's parent container).
Onto this panel I would then add the Settings panel.
Finally, I would set the parent frame's glass pane to the first (backing) pane and make it visible.
frame.getRootPane().setGlassPane(backingPane); // Or similar
Take a look at How to use Root Panes
Updated
If you can't use the glass pane of the top level frame yourself, then you need to fake it.
This example basically uses a JLayeredPane backed by a GridBagLayout
If you add a MouseListener and KeyListener to the background pane you can consume events going to the child components.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class FloatingPane {
public static void main(String[] args) {
new FloatingPane();
}
public FloatingPane() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final WorkPane workPane = new WorkPane();
JButton settings = new JButton("Settings");
settings.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
workPane.toggleSettings();
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(workPane);
frame.add(settings, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class WorkPane extends JLayeredPane {
private final BackingPane backingPane;
public WorkPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
add(createLabel("Center", Color.BLUE), gbc);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.fill = GridBagConstraints.VERTICAL;
add(createLabel("Left", Color.RED), gbc);
gbc.gridx = 2;
add(createLabel("Right", Color.GREEN), gbc);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.gridheight = GridBagConstraints.REMAINDER;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.fill = GridBagConstraints.BOTH;
backingPane = new BackingPane();
backingPane.add(new SettingsPane());
backingPane.setVisible(false);
add(backingPane, gbc);
setLayer(backingPane, DEFAULT_LAYER + 1);
}
public void toggleSettings() {
backingPane.setVisible(!backingPane.isVisible());
}
protected JLabel createLabel(String text, Color bg) {
JLabel label = new JLabel(text);
label.setHorizontalAlignment(JLabel.CENTER);
label.setOpaque(true);
label.setBackground(bg);
return label;
}
}
public class BackingPane extends JPanel {
public BackingPane() {
setLayout(new GridBagLayout());
setOpaque(false);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(new Color(128, 128, 128, 192));
g.fillRect(0, 0, getWidth(), getHeight());
}
}
public class SettingsPane extends JPanel {
public SettingsPane() {
setBorder(new EmptyBorder(10, 10, 10, 10));
add(new JLabel("Settings"));
}
}
}
Another solution might be to fake the entire glass pane by taking a snap shot of the current panel and using a CardLayout, flip to the settings pane, using the snap shot as the backgound image for the settings pane (which can could then apply effects to like gray scaling and bluring)
Related
So I'm creating a GUI that represents a vending machine. I'm just running into some problems trying to get the layout to work the way I want it. My thought was to insert an image into a JLabel, and then overlay that image with transparent JButtons in specific locations so that when you click on the image in certain locations, it will trigger the JButton. I haven't gotten to the transparency yet as I'm currently stuck on how to get the JButtons precisely where they need to be.
I've tried setLocation and setBounds with no luck. Any help on how to exactly position the jbuttons over the possible vending machine choices would be great.
import javax.swing.*;
import javax.imageio.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
public class vendMachine extends JFrame
{
//Frame Dimensions
private static final int FRAME_HEIGHT = 800;
private static final int FRAME_WIDTH = 800;
private JPanel totalGUI, imagePanel, coinPanel;
public vendMachine()
{
createComponents();
setSize(FRAME_WIDTH, FRAME_HEIGHT);
setTitle("Vending Machine");
}
private void createComponents()
{
try
{
BufferedImage machineImg = ImageIO.read(new File("images/pepsivend.jpg"));
JLabel machineImgLabel = new JLabel(new ImageIcon(machineImg));
machineImgLabel.setLayout(new FlowLayout());
JButton test = new JButton("TEST BUTTON");
machineImgLabel.add(test);
//test.setBounds(0,0,0,0);
ImageIcon pennyIcon = new ImageIcon("images/coins/penny.jpg");
JButton pennyButton = new JButton(pennyIcon);
ImageIcon nickelIcon = new ImageIcon("images/coins/nickel.jpg");
JButton nickelButton = new JButton(nickelIcon);
ImageIcon dimeIcon = new ImageIcon("images/coins/dime.jpg");
JButton dimeButton = new JButton(dimeIcon);
ImageIcon quarterIcon = new ImageIcon("images/coins/quarter.jpg");
JButton quarterButton = new JButton(quarterIcon);
coinPanel = new JPanel();
coinPanel.setLayout(new GridLayout(4,1));
coinPanel.add(pennyButton);
coinPanel.add(nickelButton);
coinPanel.add(dimeButton);
coinPanel.add(quarterButton);
totalGUI = new JPanel();
totalGUI.setLayout(new BorderLayout());
totalGUI.add(machineImgLabel, BorderLayout.CENTER);
totalGUI.add(coinPanel, BorderLayout.EAST);
}
catch (IOException e)
{
e.printStackTrace();
}
add(totalGUI);
}
}
In the above Image I would like some help on how to get the test button, to overlay on top of the pepsi selection. From there I can go about making it transparent and removing the borders and text.
Edited to add: none of the buttons do anything yet. Simply trying to get the layout going before adding in anything else
It's unclear as to what your actually problem, however, I'll start with the layout...
No single layout will ever do everything you want, some times, you'll need to use multiple layouts and compound them. This example uses a BorderLayout and a GridBagLayout to set up the basic layout...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new VendingMachinePane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class VendingMachinePane extends JPanel {
public VendingMachinePane() {
setLayout(new BorderLayout());
JLabel label = new JLabel("Cover");
// Demonstration purpose only
label.setPreferredSize(new Dimension(200, 400));
label.setOpaque(true);
label.setBackground(Color.BLUE);
add(label);
JPanel optionsPane = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.anchor = GridBagConstraints.NORTH;
optionsPane.setBackground(Color.DARK_GRAY);
optionsPane.add(new JLabel("Coin Slot"), gbc);
optionsPane.add(makeButton("Pepsi"), gbc);
optionsPane.add(makeButton("Diet Pepsi"), gbc);
optionsPane.add(makeButton("Slice"), gbc);
optionsPane.add(makeButton("Dr Pepper"), gbc);
optionsPane.add(makeButton("Lipton"), gbc);
optionsPane.add(makeButton("Mountain Dew"), gbc);
optionsPane.add(makeButton("Schweppes"), gbc);
gbc.weighty = 1;
optionsPane.add(makeButton("Pepsi"), gbc);
add(optionsPane, BorderLayout.LINE_END);
}
protected JButton makeButton(String text) {
JButton btn = new JButton(text);
btn.setBorderPainted(false);
btn.setContentAreaFilled(false);
btn.setMargin(new Insets(4, 4, 4, 4));
btn.setOpaque(false);
return btn;
}
}
}
As to your "overlay buttons" issue, to me, that doesn't make sense, since a JButton has a icon property, why not just use a JButton to start with?
You make buttons transparent simply by changing their borderPainted contentAreaFilled and opaque properties
// You can pass a `Icon` instead of a `String` to the constructor
JButton btn = new JButton(text);
btn.setBorderPainted(false);
btn.setContentAreaFilled(false);
btn.setMargin(new Insets(4, 4, 4, 4));
btn.setOpaque(false);
Don't forget to setup an ActionListener ;)
Updated, based on the updated requirements...
You Could...
Break the image down in segments, making each element it's own image and simply applying those to the buttons, using a similar approach above
You Could...
Map hot spots on the image, and using a MouseListener monitor where the mouseClicked events occur - you do lose the advantage of keyboard input though
You Could...
Map out the hot spots of the image and using a GridBagLayout or custom layout manager, map the buttons onto the image.
I have a simple GUI and I just want to have some text fields stacked on top of each other, with each box being a JPanel. I'm currently using FlowLayout for both the JFrame and JPanel but it changes from being stacked to being in a row when I maximize. Ideally I'd like the text fields to stay in the center of the window even if its maximized. I was looking at using a BoxLayout but was having some trouble getting that to work.
public static Component textbox(String x){
JPanel panel = new JPanel(new FlowLayout(5,5,5));
JLabel lbltAm= new JLabel(x);
JTextField tftAm = new JTextField(10);
lbltAm.setFont(new Font("Serif", Font.PLAIN, 14));
lbltAm.setForeground(Color.white);
panel.add(lbltAm, BorderLayout.NORTH);
panel.add(tftAm, BorderLayout.CENTER);
panel.setBackground(Color.DARK_GRAY);
Border lowerbevel = BorderFactory.createBevelBorder(BevelBorder.LOWERED);
panel.setBorder(lowerbevel);
return panel;
}
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("Tip Calculator");
//Add Textbox
frame.setLayout(new BoxLayout(frame, BoxLayout.Y_AXIS));
String Label = "Tip Calculator";
JLabel header = new JLabel(Label);
header.setFont(new Font("Serif", Font.BOLD, 18));
frame.add(header);
frame.add(textbox("Total"));
frame.add(textbox("Tip %"));
frame.add(textbox("People"));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setBackground(Color.gray);
frame.setPreferredSize(new Dimension(300, 400));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
It's a matter of opinion, but for flexibility, I prefer to use GridBagLayout
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.BevelBorder;
import javax.swing.border.Border;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(textbox("Total"), gbc);
add(textbox("Tip %"), gbc);
add(textbox("People"), gbc);
}
public Component textbox(String x) {
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.insets = new Insets(5, 5, 5, 5);
JLabel lbltAm = new JLabel(x);
JTextField tftAm = new JTextField(10);
lbltAm.setFont(new Font("Serif", Font.PLAIN, 14));
lbltAm.setForeground(Color.white);
panel.add(lbltAm, gbc);
panel.add(tftAm, gbc);
panel.setBackground(Color.DARK_GRAY);
Border lowerbevel = BorderFactory.createBevelBorder(BevelBorder.LOWERED);
panel.setBorder(lowerbevel);
return panel;
}
}
}
Or if your wanted the "boxes" to occupy the whole area when expanded, you could use something like...
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
add(textbox("Total"), gbc);
add(textbox("Tip %"), gbc);
add(textbox("People"), gbc);
Which results in something like...
Have a look at Laying Out Components Within a Container and How to Use GridBagLayout for more details
Firstly, I don't know why you're adding components to the JPanel with a method that is for BorderLayout after you've set the layout of panel as FlowLayout.
If you want to keep the components centered at all times (even if the screen is maximized), FlowLayout is probably not the best option for you to work with, as FlowLayout continues to position components horizontally until they fill the width of the frame (one row) and then, it begins the next row. Therefore, if the screen size is maximized, there will be more components per row and they won't be stacked. I would suggest using a GridLayout with one column like so:
frame.setLayout(new GridLayout(3 *(number of rows/components)*, 1));
You can do the same with the JPanel. After that, set the horizontal alignment of each component as centered like so:
component.setHorizontalAlignment(componentName.CENTER);
Hope this helps!
Try to use GridLayout instead of BoxLayout in createAndShowGUI.
frame.setLayout(new GridLayout(4,1));
I'm having trouble positioning elements in a JPanel. I tried using GridBagLayout but that doesn't seem to make any of the parts of the panel GUI components move. What should I do?
panel.add(Label);
panel.add(TextField);
panel.add(Label);
panel.add(JChooser);
Nothing seems to help move these GUI elements. They just act like they are in a FlowLayout. What should I do? I'm using a CardLayout for another panel (that panel holds other panels like this one in it), but this panel, I need to align them to the left.
The Label and TextField need to be on the same line, but the Label and JChooser need to be on a different line.
Example:
SomeLabel : [ TextField ]
SomeLabel : [Chooser]
I hope I explained well enough.
Take a closer look at Laying Out Components Within a Container and How to Use GridBagLayout
GridBagLayout requires constraints, which define how and where a component will be positioned within the virtual grid maintained by it
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestLayout {
public static void main(String[] args) {
new TestLayout();
}
public TestLayout() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
gbc.insets = new Insets(4, 4, 4, 4);
add(new JLabel("SomeLabel :"), gbc);
gbc.gridy++;
add(new JLabel("SomeLabel :"), gbc);
gbc.gridx = 1;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.EAST;
gbc.fill = GridBagConstraints.BOTH;
add(new JTextField(10), gbc);
gbc.gridy++;
add(new JComboBox(new Object[]{"Puppies", "Kittens"}), gbc);
}
}
}
To set elements in JPanel use one of LayoutManagers.
If you want to set components free from location.
then use following to remove layout.
panel.setLayout(null);
After this you can call setBounds method to set bounds for component, or setLocation .
comp.setLocation(int left, int top);
comp.setBounds(int left, int top, int width, int height);
I have encountered a problem whilst working the JFrame's, and JButtons. I am trying to center my JButton, however when I do so, it covers almost the entire screen. Any idea's on what's causing this?
Here is a picture on how it looks :
And here is my code :
package character;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.io.IOException;
/**
* Created by Niknea on 6/28/14.
*/
public class characterSelector{
JFrame cselectorButtons, clogo;
JLabel logo, characterName, label;
JButton male, female;
public characterSelector(){
this.createCharacterSelector();
}
public void createCharacterSelector() {
try {
label = new JLabel(new ImageIcon(ImageIO.read(getClass()
.getResource("/resources/Grass_Background.jpg"))));
cselectorButtons = new JFrame("SupremeSoccer");
logo = new JLabel(new ImageIcon(ImageIO.read(this.getClass().getResource("/resources/Character_Selector_Image.png"))));
characterName = new JLabel("<Character Name>");
characterName.setFont(new Font(characterName.getFont().getName(),
Font.HANGING_BASELINE, 50));
/*
Buttons
*/
male = new JButton("Male");
////******************////
//// END OF BUTTONS ////
////****************////
cselectorButtons.add(logo);
cselectorButtons.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
cselectorButtons.setContentPane(label);
cselectorButtons.setLayout(new BorderLayout());
cselectorButtons.add(logo, BorderLayout.NORTH);
cselectorButtons.add(male, BorderLayout.CENTER);
cselectorButtons.pack();
cselectorButtons.setLocationRelativeTo(null);
cselectorButtons.setVisible(true);
} catch (IOException exp) {
exp.printStackTrace();
}
}
}
Thanks again.
Any idea's on what's causing this?
This is the default behaviour of BorderLayout. The component at the CENTER position will occupy the maximum amount of space the is available from the parent component, when the other (NORTH, SOUTH, EAST, WEST) positions have been taken into account
Depending on what you are trying to achieve you might consider creating another JPanel (set it's opaque state to false so it's transparent) and use something like GridLayout or GridBagLayout instead.
Take a look at A Visual Guide to Layout Managers for some more ideas
Updated
So based on your linked code, I changed
part2 = new JPanel();
to
part2 = new JPanel(new java.awt.GridBagLayout());
And got...
Updated with additional example
Start by breaking down your requirements into individual containers and focus on the layout requirements for each individual, then build them all back into a single container.
This will make changing them later much easier and also make controlling them much easier...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ExampleLayout {
public static void main(String[] args) {
new ExampleLayout();
}
public ExampleLayout() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private HeaderPane header;
private ScorePane score;
private CharacterSelectionPane characterSelection;
public TestPane() {
setLayout(new BorderLayout());
JLabel background = new JLabel();
try {
BufferedImage img = ImageIO.read(getClass().getResource("/Grass.jpg"));
background.setIcon(new ImageIcon(img));
} catch (IOException ex) {
ex.printStackTrace();
}
add(background);
background.setLayout(new GridBagLayout());
header = new HeaderPane();
score = new ScorePane();
characterSelection = new CharacterSelectionPane();
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.BOTH;
background.add(header, gbc);
background.add(score, gbc);
gbc.weighty = 1;
background.add(characterSelection, gbc);
}
}
public class HeaderPane extends JPanel {
public HeaderPane() {
setLayout(new BorderLayout());
JLabel label = new JLabel("Character Selection");
label.setForeground(Color.WHITE);
label.setFont(label.getFont().deriveFont(Font.BOLD, 48f));
label.setHorizontalAlignment(JLabel.CENTER);
add(label);
setOpaque(false);
}
}
public class ScorePane extends JPanel {
public ScorePane() {
JLabel label = new JLabel("[-][-[]-][-]");
label.setForeground(Color.YELLOW);
add(label);
setOpaque(false);
}
}
public class CharacterSelectionPane extends JPanel {
private JButton btMale;
private JButton btFemale;
private JTextField tfName;
private JButton btContinue;
public CharacterSelectionPane() {
setOpaque(false);
setLayout(new GridBagLayout());
btMale = new JButton("Male");
btFemale = new JButton("Female");
btContinue = new JButton("Continue");
tfName = new JTextField(10);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.insets = new Insets(4, 4, 4, 4);
gbc.fill = GridBagConstraints.HORIZONTAL;
add(btMale, gbc);
gbc.gridx++;
add(btFemale, gbc);
gbc.gridx = 0;
gbc.gridy++;
add(new JLabel("Name:"), gbc);
gbc.gridx++;
add(tfName, gbc);
gbc.gridx = 0;
gbc.gridy++;
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(btContinue, gbc);
}
}
}
Use a BoxLayout or (easier) GridBagLayout for the bottom area, as seen in this answer.
I've found myself writing up quite a few programs recently which all need to display some collection of data. So far the best looking approach I've thought of is make small JPanels which contain data on each item in the collection and put them all in a big JPanel which I then put in a JScrollPane. It works and looks just as intended but there's one issue: I can't seem to get the smaller JPanels to start at the top of the bigger JPanel.
The problem is only apparent when I've got a small number of small JPanels (green) added into the bigger JPanel (red).
Described below is the method I used to produce the above and I'd like to know if there's a better way I could do it (where the list starts at the top like it should):
I created a class which extends JPanel and in it add all data I want to display. We'll call it "SmallPanel.java". I don't set the size of it (that comes later).
In my main window's class (which extends JFrame):
private JScrollPane scrollPane;
private JPanel panel;
...
scrollPane = new JScrollPane();
getContentPane().add(scrollPane);
panel = new JPanel();
panel.setLayout(new GridBagLayout());
scrollPane.setViewportView(panel);
...
private void addPanel()
{
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = panel.getComponentCount(); //The new JPanel's place in the list
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.anchor = GridBagConstraints.PAGE_START; //I thought this would do it
gbc.ipady = 130; //Set the panel's height, the width will get set to that of the container JPanel (which is what I want since I'd like my JFrames to be resizable)
gbc.insets = new Insets(2, 0, 2, 0); //Separation between JPanels in the list
gbc.weightx = 1.0;
SmallPanel smallPanel = new SmallPanel();
panel.add(smallPanel, gbc);
panel.revalidate();
panel.invalidate();
panel.repaint(); //Better safe than peeved
}
Call the addPanel() method every time I want to add a panel.
EDIT
Final solution (based on MadProgrammer's answer below):
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.border.BevelBorder;
public class ListPanel extends JPanel
{
private static final long serialVersionUID = 1L;
private JPanel fillerPanel;
private ArrayList<JPanel> panels;
public ListPanel(List<JPanel> panels, int height)
{
this(panels, height, new Insets(2, 0, 2, 0));
}
public ListPanel(List<JPanel> panels, int height, Insets insets)
{
this();
for (JPanel panel : panels)
addPanel(panel, height, insets);
}
public ListPanel()
{
super();
this.fillerPanel = new JPanel();
this.fillerPanel.setMinimumSize(new Dimension(0, 0));
this.panels = new ArrayList<JPanel>();
setLayout(new GridBagLayout());
}
public void addPanel(JPanel p, int height)
{
addPanel(p, height, new Insets(2, 0, 2, 0));
}
public void addPanel(JPanel p, int height, Insets insets)
{
super.remove(fillerPanel);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = getComponentCount();
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.anchor = GridBagConstraints.PAGE_START;
gbc.ipady = height;
gbc.insets = insets;
gbc.weightx = 1.0;
panels.add(p);
add(p, gbc);
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = getComponentCount();
gbc.fill = GridBagConstraints.VERTICAL;
gbc.weighty = 1.0;
add(fillerPanel, gbc);
revalidate();
invalidate();
repaint();
}
public void removePanel(JPanel p)
{
removePanel(panels.indexOf(p));
}
public void removePanel(int i)
{
super.remove(i);
panels.remove(i);
revalidate();
invalidate();
repaint();
}
public ArrayList<JPanel> getPanels()
{
return this.panels;
}
public static void main(String[] args)
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setMinimumSize(new Dimension(500, 500));
f.setLocationRelativeTo(null);
f.getContentPane().setLayout(new BorderLayout());
final ListPanel listPanel = new ListPanel();
for (int i = 1; i <= 10; i++)
listPanel.addPanel(getRandomJPanel(), new Random().nextInt(50) + 50);
JButton btnAdd = new JButton("Add");
btnAdd.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent paramActionEvent)
{
listPanel.addPanel(getRandomJPanel(), new Random().nextInt(50) + 50);
}
});
JButton btnRemove = new JButton("Remove");
btnRemove.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent paramActionEvent)
{
listPanel.removePanel(0);
}
});
f.getContentPane().add(btnRemove, BorderLayout.NORTH);
f.getContentPane().add(btnAdd, BorderLayout.SOUTH);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
scrollPane.setViewportView(listPanel);
f.getContentPane().add(scrollPane, BorderLayout.CENTER);
f.setVisible(true);
}
public static JPanel getRandomJPanel()
{
JPanel panel = new JPanel();
panel.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
panel.add(new JLabel("This is a randomly sized JPanel"));
panel.setBackground(new Color(new Random().nextFloat(), new Random().nextFloat(), new Random().nextFloat()));
return panel;
}
}
The best solution I've found is to use VerticalLayout from the SwingLabs SwingX (which can be downloaded from here) libraries.
You "could" use a GridBagLayout with an invisible component positioned at the end, whose weighty property is set to 1, but this is a lot more additional work to manage, as you need to keep updating the x/y positions of all the components to keep it in place...
Updated with GridBagLayout example
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class VerticalLayoutExample {
public static void main(String[] args) {
new VerticalLayoutExample();
}
public VerticalLayoutExample() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final TestPane pane = new TestPane();
JButton add = new JButton("Add");
add.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
pane.addAnotherPane();
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(pane));
frame.add(add, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JPanel filler;
private int y = 0;
public TestPane() {
setBackground(Color.RED);
setLayout(new GridBagLayout());
filler = new JPanel();
filler.setOpaque(false);
GridBagConstraints gbc = new GridBagConstraints();
gbc.weighty = 1;
gbc.gridy = 0;
add(filler, gbc);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 400);
}
public void addAnotherPane() {
JPanel panel = new JPanel(new GridBagLayout());
panel.add(new JLabel("Hello"));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridy = y++;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.insets = new Insets(4, 4, 4, 4);
add(panel, gbc);
GridBagLayout gbl = ((GridBagLayout)getLayout());
gbc = gbl.getConstraints(filler);
gbc.gridy = y++;
gbl.setConstraints(filler, gbc);
revalidate();
repaint();
}
}
}
This is just a concept. As camickr has pointed out, so long as you know the last component, you can adjust the GridBagConstraints of the component so that the last component which is in the list has the weighty of 1 instead...
As you can, you can override some of the things GridBagLayout does, for example, instead of using the preferred size of the panel, I've asked GridBagLayout to make it fill the HORIZONTAL width of the parent container...
You can use a vertical BoxLayout.
Just make sure the maximum size of the panel is equal to the preferred size so the panel doesn't grow.
Edit:
Since your class already has a custom panel all you need to do is override the getMaximumSize() method to return an appropriate value. Something like:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class VerticalLayoutExample2 {
public static void main(String[] args) {
new VerticalLayoutExample2();
}
public VerticalLayoutExample2() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final TestPane pane = new TestPane();
JButton add = new JButton("Add");
add.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
pane.addAnotherPane();
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(pane));
frame.add(add, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JPanel filler;
private int y = 0;
public TestPane() {
setBackground(Color.RED);
setLayout(new GridBagLayout());
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
setBorder( new EmptyBorder(4, 4, 4, 4) );
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 400);
}
public void addAnotherPane() {
SmallPanel panel = new SmallPanel();
panel.setLayout( new GridBagLayout() );
panel.add(new JLabel("Hello"));
add(panel);
add(Box.createVerticalStrut(4));
revalidate();
repaint();
}
}
static class SmallPanel extends JPanel
{
#Override
public Dimension getMaximumSize()
{
Dimension preferred = super.getPreferredSize();
Dimension maximum = super.getMaximumSize();
maximum.height = preferred.height;
return maximum;
}
}
}
I know you mentioned you don't want to use a lib, but you can also look at Relative Layout. It is only a single class. It can easily mimic a BoxLayout but is easier to use because you don't need to override the getMaximumSize() method or add a Box component to the panel to give the vertical spacing.
You would set it as the layout of your panel as follow:
RelativeLayout rl = new RelativeLayout(RelativeLayout.Y_AXIS);
rl.setFill( true ); // fills components horizontally
rl.setGap(4); // vertical gap between panels
yourPanel.setLayout(rl);
yourPanel.add( new SmallPanel(...) );
yourPanel.add( new SmallPanel(...) );