I have searched the web for a solution to this problem and didn't find anything that worked.
I have a vertical JSlider inside a JPanel that uses GridBagLayout and a GridBagConstraints for positioning the objects on the panel.
Currently I have the following code:
gbc.gridy = 1;
add(button1,gbc);
gbc.gridy = 2;
add(button2,gbc);
gbc.gridy = 3;
add(slider,gbc);
The objects are positioned vertically along the panel.
The slider always appears in the same size (length). Tried to use setPreferredSize - didn't work. Tried to use gridheight in order to have to slider cross two rows - didn't work either. Tried to change the actual min and max values of the slider, didn't help.
Shouldn't GridBagLayout respect preferred size?
EDIT: Also tried creating anoter JPanel inside the main JPanel, set it's layout to FlowLayout, BoxLayout or GridLayout, and add the slider to it. Didn't change a thing. Very weird.
Any ideas?
Use a different layout manager (or put the slider in a nested JPanel with a different layout manager), that will stretch the JSlider. In the example I use BorderLayout
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
public class DifferentSizeSlider extends JPanel{
public DifferentSizeSlider() {
JPanel topPanel = new JPanel(new BorderLayout());
topPanel.add(new JSlider());
JPanel bottomPanel = new JPanel(new GridLayout(1, 2));
bottomPanel.add(new JSlider());
bottomPanel.add(new JPanel());
setLayout(new GridLayout(2, 1));
add(topPanel);
add(bottomPanel);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
JOptionPane.showMessageDialog(null, new DifferentSizeSlider());
}
});
}
}
EDIT with your code example
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
public class DifferentSizeSlider extends JPanel{
public DifferentSizeSlider() {
JPanel topPanel = new JPanel(new BorderLayout());
topPanel.setPreferredSize(new Dimension(400, 50));
topPanel.add(new JSlider());
JButton jbtOne = new JButton("Button");
JButton jbtTwo = new JButton("Button");
GridBagConstraints gbc = new GridBagConstraints();
setLayout(new GridBagLayout());
gbc.gridy = 0;
add(jbtOne,gbc);
gbc.gridy = 1;
add(jbtTwo,gbc);
gbc.gridy = 2;
add(topPanel, gbc);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
JOptionPane.showMessageDialog(null, new DifferentSizeSlider());
}
});
}
}
To change the size of a swing component you use the setPrefferedSize() method
setPreferredSize(new Dimension(300, 80));
You may have to use a separate panel with a flowLayout for the slider then add that panel to the . Some layout managers may not take the preferred size.
Related
So after a day of studying layout managers and reading some swing refrences, this is what i come up with...
import java.awt.*;
import javax.swing.*;
public class Flags {
public static void startup() {
GridLayout Layout = new GridLayout(6,4);
JFrame menu = new JFrame("Flag Menu");
menu.setResizable(false);
menu.setSize(600,400);
JButton tailand = new JButton("Tailand");
JButton norway = new JButton("Norway");
JPanel panel = new JPanel();
panel.setLayout(Layout);
panel.add(norway);
panel.add(tailand);
menu.add(panel);
panel.setBackground(Color.LIGHT_GRAY);
tailand.setBackground(Color.WHITE);
norway.setBackground(Color.WHITE);
menu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
menu.setLocationRelativeTo(null);
;
menu.setVisible(true);
}
}
The problem is that i want my buttons to start at the bottom left and be equally spaced between the 4 other buttons i want to make.
There's a number of ways you "might" achieve this and the solution will ultimately depend on what you are trying to achieve.
Personally, I'd start with GridBagLayout - while not the friendliness of layout managers, it is by far the most flexible.
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Flags {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
new Flags().startup();
}
});
}
public static void startup() {
GridLayout Layout = new GridLayout(6, 4);
JFrame menu = new JFrame("Flag Menu");
// menu.setResizable(false);
// menu.setSize(600, 400);
menu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton tailand = new JButton("Tailand");
JButton norway = new JButton("Norway");
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.weighty = 1;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.anchor = GridBagConstraints.SOUTH;
panel.add(norway, gbc);
gbc.weighty = 0;
panel.add(tailand, gbc);
menu.add(panel);
panel.setBackground(Color.LIGHT_GRAY);
tailand.setBackground(Color.WHITE);
norway.setBackground(Color.WHITE);
menu.pack();
menu.setLocationRelativeTo(null);
menu.setVisible(true);
}
}
Another choice might be to use compound layouts, so that the "button" panel is placed at the SOUTH position of a BorderLayout and the "content" placed in the CENTER
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));
JPanel panel = new JPanel(new GridLayout(0,1));
JScrollPane contentpane = new JScrollPane(panel);
JButton add = new JButton("ADD");
add.actionListener(new ActionListener() {
public void actionPerformed(){
MyPanel newpanel = new MyPanel("title","Button"); //MyPanel is a class which extends JPanel and contains constructor MyPanel(String TitleToSet ,String ButtonTitleTOAdd)
panel.add(newpanel);
panel.repaint();
}) ;
I have used this code thinking that it will add the MyPanel to the grid layout dynamically and "panel" would be scrollable if more "MyPanel"s are added. However, this was not the case, 1st "MyPanel" filled whole "panel" and on adding second "MyPanel" (by clicking button "Add"), the 1st "MyPanel" was shrinked to make space for second one to be added.. and on adding more, all the "MyPanel"s were fit in the viewport instead of making the "panel" scrollable.. How to add those "MyPanel"s dynamically and making the "panel" scrollable on adding more of those?? Any help would be appreciated.
http://docs.oracle.com/javase/7/docs/api/javax/swing/JScrollPane.html :
By default JScrollPane uses ScrollPaneLayout to handle the layout of
its child Components. ScrollPaneLayout determines the size to make the
viewport view in one of two ways:
[...]
getPreferredSize is used.
You should add the line
panel.setPreferredSize(new Dimension(0, panel.getComponents().size() * SUB_PANEL_HEIGHT));
to your ActionListener.
Full example:
package main;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Panel;
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.Timer;
class Test {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setPreferredSize(new Dimension(400, 400));
frame.setSize(400, 400);
JPanel panel = new JPanel(new GridLayout(0, 1));
panel.add(new JLabel("BOO"));
panel.add(new JButton("BBBB"));
JScrollPane contentpane = new JScrollPane(panel);
frame.add(contentpane);
new Timer(1000, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
JPanel newpanel = new JPanel();
newpanel.add(new JLabel("LOL"));
panel.add(newpanel);
System.out.println(100 * panel.getComponents().length);
panel.setPreferredSize(new Dimension(0, 100 * panel.getComponents().length));
contentpane.validate();
}
}).start();
frame.setVisible(true);
}
}
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);