I have a JTextField inside a JPanel . The user can type text as big as she wants in the textfield , however horizontal scrolling should appear when the text goes beyond the screen of the textfield. At this point if the user backspace the text and shrink the text within the screen of the textfield , the scrolling should disappear. So basically scrolling should appear only when its needed. How to do it ? Help please.
If you don't like the behavior of the JScrollPane + JTextField, you need to use JScrollBar#setModel(BoundedRangeModel) + JTextField#getHorizontalVisibility():
import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.basic.BasicScrollBarUI;
public class TextFieldScrollBarTest {
private static final String TEXT = "javascript:(function(){var l=location,m=l.href.match('^(https?://)(.+)(api[^+]+|technotes[^+]+)');if(m)l.href=m[1]+'docs.oracle.com/javase/8/docs/'+decodeURIComponent(m[3]).replace(/\\+.*$/,'').replace(/\\[\\]/g,':A').replace(/, |\\(|\\)/g,'-');}());";
public JComponent makeUI() {
JScrollPane scroll = new JScrollPane(new JTextField(TEXT));
scroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
JTextField textField = new JTextField(TEXT);
JScrollBar scroller = new JScrollBar(Adjustable.HORIZONTAL) {
#Override public void updateUI() {
//super.updateUI();
setUI(new ArrowButtonlessScrollBarUI());
}
#Override public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
d.height = 5;
return d;
}
};
scroller.setModel(textField.getHorizontalVisibility());
Box box = Box.createVerticalBox();
box.add(scroll);
box.add(Box.createVerticalStrut(50));
box.add(textField);
box.add(Box.createVerticalStrut(2));
box.add(scroller);
box.add(Box.createVerticalGlue());
JPanel p = new JPanel(new BorderLayout());
p.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
p.add(box, BorderLayout.NORTH);
return p;
}
public static void main(String... args) {
EventQueue.invokeLater(() -> {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new TextFieldScrollBarTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}
class ZeroSizeButton extends JButton {
private static final Dimension ZERO_SIZE = new Dimension();
#Override public Dimension getPreferredSize() {
return ZERO_SIZE;
}
}
class ArrowButtonlessScrollBarUI extends BasicScrollBarUI {
private static final Color DEFAULT_COLOR = new Color(220, 100, 100);
private static final Color DRAGGING_COLOR = new Color(200, 100, 100);
private static final Color ROLLOVER_COLOR = new Color(255, 120, 100);
#Override protected JButton createDecreaseButton(int orientation) {
return new ZeroSizeButton();
}
#Override protected JButton createIncreaseButton(int orientation) {
return new ZeroSizeButton();
}
#Override protected void paintTrack(Graphics g, JComponent c, Rectangle r) {
//Graphics2D g2 = (Graphics2D) g.create();
//g2.setPaint(new Color(100, 100, 100));
//g2.fillRect(r.x, r.y, r.width - 1, r.height - 1);
//g2.dispose();
}
#Override protected void paintThumb(Graphics g, JComponent c, Rectangle r) {
JScrollBar sb = (JScrollBar) c;
if (!sb.isEnabled()) {
return;
}
BoundedRangeModel m = sb.getModel();
int iv = m.getMaximum() - m.getMinimum() - m.getExtent() - 1; // -1: bug?
if (iv > 0) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Color color;
if (isDragging) {
color = DRAGGING_COLOR;
} else if (isThumbRollover()) {
color = ROLLOVER_COLOR;
} else {
color = DEFAULT_COLOR;
}
g2.setPaint(color);
g2.fillRect(r.x, r.y, r.width - 1, r.height - 1);
g2.dispose();
}
}
}
Related
Hello I am new to JAVA and recently studied graphics but got stuck on how to draw a circle (I learn on my own through Google) I would be happy if you help me with the following lines of code
(Do not refer to the background sub button)
public class Panel_ {
static JPanel panel1 = new JPanel();
public static Color randomColor() {
int r = (int) Math.round(Math.random() * 255 - 1);
int g = (int) Math.round(Math.random() * 255 - 1);
int b = (int) Math.round(Math.random() * 255 - 1);
Color R_col = new Color(r, g, b);
System.out.println(R_col);
return R_col;
}
public static void Panel() {
var color_changer = new JButton("To change color");
color_changer.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panel1.setBackground(randomColor());
}
});
var Panel = new JPanel();
Panel.add(color_changer);
Panel.setBackground(Color.blue);
panel1.setBackground(Color.black);
panel1.setPreferredSize(new Dimension(400, 430));
var frame = new JFrame("Color changer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel1, BorderLayout.NORTH);
frame.getContentPane().add(Panel, BorderLayout.SOUTH);
frame.pack();
frame.setSize(500, 500);
frame.setBackground(Color.blue);
frame.setVisible(true);
}
public void paintCircle(Graphics g) {
g.setColor(Color.blue);
g.fillOval(60, 80, 100, 100);
}
public static void main(String args[]) {
Panel();
}
}
Use paintComponent for panel1 which I changed the name to topPanel in the runnable code below:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import javax.swing.*;
public class Panel extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel topPanel;
private JPanel panel;
private JButton color_changer;
public Panel() {
initializeForm();
}
private void initializeForm() {
setAlwaysOnTop(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBackground(Color.blue);
color_changer = new JButton("To change color");
color_changer.addActionListener((ActionEvent e) -> {
topPanel.setBackground(randomColor());
});
topPanel = new JPanel() {
private static final long serialVersionUID = 1L;
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.blue);
g.fillOval(60, 80, 100, 100);
};
};
panel = new JPanel();
panel.add(color_changer);
panel.setBackground(Color.blue);
topPanel.setBackground(Color.black);
topPanel.setOpaque(true);
topPanel.setPreferredSize(new Dimension(400, 430));
getContentPane().add(topPanel, BorderLayout.NORTH);
getContentPane().add(panel, BorderLayout.SOUTH);
pack();
setLocationRelativeTo(null);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(() -> {
new Panel().setVisible(true);
});
}
public static Color randomColor() {
int r = (int) Math.round(Math.random() * 255 - 1);
int g = (int) Math.round(Math.random() * 255 - 1);
int b = (int) Math.round(Math.random() * 255 - 1);
Color R_col = new Color(r, g, b);
System.out.println(R_col);
return R_col;
}
}
I am trying to add a Rectangle in the panel by button press and remove it with another one. It should work but it doesn't render anything, and I absolutely don't know why.
Can someone explain what I am doing wrong and give me some nice tips what I can improve with my code?
public class GUI extends JPanel {
public static boolean isRecVisible = false;
public static void main(String[] args) {
createGui();
}
#Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
super.paintComponent(g);
g2d.drawRect(10, 10, 200, 200);
}
public static void createGui() {
int frameWidth = 550;
int frameHeight = 400;
int buttonWidth1 = 250;
int buttonHeight1 = 30;
int buttonWidth2 = 500;
int buttonHeight2 = 30;
int displayWidth = frameWidth - 20;
int displayHeight = frameHeight - 105;
GUI drawRec = new GUI();
JFrame f = new JFrame("Rectangle");
JPanel p = new JPanel();
JPanel display = new JPanel();
JButton addRec = new JButton("Add Rectangle");
JButton removeRec = new JButton("Remove Rectangle");
JButton colorRec = new JButton("Color Rectangle");
f.add(p);
p.add(addRec);
p.add(removeRec);
p.add(colorRec);
p.add(display);
display.setBackground(Color.LIGHT_GRAY);
f.setSize(frameWidth, frameHeight);
f.setLocationRelativeTo(null);
f.setResizable(false);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
display.setBounds(frameWidth / 2 - displayWidth / 2, 10, displayWidth, displayHeight);
addRec.setBounds(frameWidth / 2 - buttonWidth1 / 2 - 250 / 2, frameHeight - 85, buttonWidth1, buttonHeight1);
removeRec.setBounds(frameWidth / 2 - buttonWidth1 / 2 + 250 / 2, frameHeight - 85, buttonWidth1, buttonHeight1);
colorRec.setBounds(frameWidth / 2 - buttonWidth2 / 2, frameHeight - 60, buttonWidth2, buttonHeight2);
addRec.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if (isRecVisible == false) {
isRecVisible = true;
display.add(drawRec);
display.repaint();
System.out.println("Rectangle has been drawn!");
} else {
System.out.println("Rectangle has already been drawn!");
return;
}
}
});
removeRec.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if (isRecVisible == true) {
isRecVisible = false;
System.out.println("Rectangle has been removed!");
} else {
System.out.println("Rectangle has already been removed");
return;
}
}
});
}
}
display.add(drawRec);
display.repaint();
When you add (or remove) components to a visible frame then the basic logic is:
display.add(...);
display.revalidate();
display.repaint(); // sometimes needed
The revalidate() is the key method because it invokes the layout manager so the size/location of the component can be set.
However, that still won't fix the problem because your custom panel doesn't have a preferred size, so there is nothing to paint for your component.
You need to override the getPreferredSize() method of your custom panel to return the preferred size of your custom component. So in your case you might set the preferred size to be (220, 220) so the rectangle is centered in the panel.
Read the section from the Swing tutorial on Custom Painting for more information and complete working examples.
Note: the tutorial example will also show you how to better structure your code to make sure the GUI is created on the Event Dispatch Thread.
Rather than adding or removing components, it would make more sense here to add the custom painted panel on construction, and use the isRecVisible boolean as a flag to test for drawing the rectangle.
Something like shown here:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GUI extends JPanel {
public static boolean isRecVisible = false;
public static void main(String[] args) {
createGui();
}
#Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
super.paintComponent(g);
if (isRecVisible) {
g2d.drawRect(10, 10, 200, 200);
}
}
#Override
public Dimension getPreferredSize() {
return new Dimension(600,400);
}
public static void createGui() {
int frameWidth = 550;
int frameHeight = 400;
GUI drawRec = new GUI();
drawRec.setBackground(Color.LIGHT_GRAY);
JFrame f = new JFrame("Rectangle");
JPanel p = new JPanel();
JButton addRec = new JButton("Add Rectangle");
JButton removeRec = new JButton("Remove Rectangle");
JButton colorRec = new JButton("Color Rectangle");
f.add(p, BorderLayout.PAGE_START);
p.add(addRec);
p.add(removeRec);
p.add(colorRec);
f.add(drawRec);
f.setSize(frameWidth, frameHeight);
f.setLocationRelativeTo(null);
f.setResizable(false);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
addRec.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
isRecVisible = true;
drawRec.repaint();
}
});
removeRec.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
isRecVisible = false;
drawRec.repaint();
}
});
}
}
My JPanel doesn't show up when my JButton is clicked. It does shows up when I add the JPanel in my go() method. However, once I tried to execute it by click the JButton, it doesn't work. The program does goes into the loop of the actionPeformed() method of the listener though.
public class MyShape
{
JFrame frame;
JPanel panel;
JButton drawButton;
public static void main (String[] args)
{
MyShape test = new MyRandomShape();
test.go();
}
public void go()
{
drawButton = new JButton("Draw Shape!");
drawButton.addActionListener(new DrawListener());
frame = new JFrame();
frame.add(drawButton, BorderLayout.NORTH);
frame.setSize(500,500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private class DrawListener implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
if(empty)
{
System.out.print("IN");
panel = new DrawPanel();
frame.add(panel, BorderLayout.CENTER);
}
}
}
private class DrawPanel extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponents(g);
int randNo = (int)(Math.random() * 3);
int width = (int)(Math.random() * getWidth());
int height = (int)(Math.random() * getHeight());
int xpos = getWidth()/2-width/2;
int ypos = getHeight()/2-height/2;
int v1 = (int)(Math.random() * 256);
int v2 = (int)(Math.random() * 256);
int v3 = (int)(Math.random() * 256);
g.setColor(new Color(v1, v2, v3));
if(randNo == 0)
{
g.fillOval(xpos, ypos, width, height);
}
else if(randNo == 1)
{
g.fillRect(xpos, ypos, width, height);
}
else
{
int startAngle = (int)(Math.random() * 360);
int arcAngle = (int)(Math.random() * 360);
g.fillArc(xpos, ypos, width, height, startAngle, arcAngle);
}
}
}
}
How do I get the JPanel to show up once the button is clicked?
You have to call parentComponent.revalidate() every time you do one or more parentComponent.add(childComponent) (or change its children in other ways, such as reorder or remove them).
In your case, your code should be
private class DrawListener implements ActionListener {
public void actionPerformed(ActionEvent event)
{
if(empty)
{
System.out.print("IN");
panel = new DrawPanel();
frame.add(panel, BorderLayout.CENTER);
frame.revalidate(); // <---------- important
}
}
}
Few changes, check this
public static void main(String[] args) {
MyShape test = new MyShape();
test.go();
}
public void go() {
drawButton = new JButton("Draw Shape!");
drawButton.addActionListener(new DrawListener());
frame = new JFrame();
frame.getContentPane().add(drawButton, BorderLayout.NORTH);
panel = new DrawPanel();
frame.getContentPane().add(panel, BorderLayout.CENTER);
frame.setSize(500, 500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private class DrawListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
frame.getContentPane().remove(1);
panel = new DrawPanel();
frame.getContentPane().add(panel, BorderLayout.CENTER);
frame.repaint();
frame.validate();
}
}
I am trying to get a JPanel to appear inside of another JPanel. Currently, the JPanel is in an external JFrame and loads with my other JFrame. I want the JPanel to be inside the other JPanel so the program does not open two different windows.
Here is a picture:
The small JPanel with the text logs I want inside of the main game frame. I've tried adding the panel to the panel, panel.add(othePanel). I've tried adding it the JFrame, frame.add(otherPanel). It just overwrites everything else and gives it a black background.
How can I add the panel, resize, and move it?
Edits:
That is where I want the chatbox to be.
Class code:
Left out top of class.
public static JPanel panel;
public static JTextArea textArea = new JTextArea(5, 30);
public static JTextField userInputField = new JTextField(30);
public static void write(String message) {
Chatbox.textArea.append("[Game]: " + message + "\n");
Chatbox.textArea.setCaretPosition(Chatbox.textArea.getDocument()
.getLength());
Chatbox.userInputField.setText("");
}
public Chatbox() {
panel = new JPanel();
panel.setPreferredSize(new Dimension(220, 40));
panel.setBackground(Color.BLACK);
JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setPreferredSize(new Dimension(380, 100));
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
textArea.setEditable(false);
scrollPane
.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
userInputField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
String fromUser = userInputField.getText();
if (fromUser != null) {
textArea.append(Frame.username + ":" + fromUser + "\n");
textArea.setCaretPosition(textArea.getDocument()
.getLength());
userInputField.setText("");
}
}
});
panel.add(userInputField, SwingConstants.CENTER);
panel.add(scrollPane, SwingConstants.CENTER);
//JFrame frame = new JFrame();
//frame.add(panel);
//frame.setSize(400, 170);
//frame.setVisible(true);
}
Main frame class:
public Frame() {
frame.getContentPane().remove(loginPanel);
frame.repaint();
String capName = capitalizeString(Frame.username);
name = new JLabel(capName);
new EnemyHealth("enemyhealth10.png");
new Health("health10.png");
new LoadRedCharacter("goingdown.gif");
new Spellbook();
new LoadMobs();
new LoadItems();
new Background();
new Inventory();
new ChatboxInterface();
frame.setBackground(Color.black);
Frame.redHealthLabel.setFont(new Font("Serif", Font.PLAIN, 20));
ticks.setFont(new Font("Serif", Font.PLAIN, 20));
ticks.setForeground(Color.yellow);
Frame.redHealthLabel.setForeground(Color.black);
// Inventory slots
panel.add(slot1);
panel.add(name);
name.setFont(new Font("Serif", Font.PLAIN, 20));
name.setForeground(Color.white);
panel.add(enemyHealthLabel);
panel.add(redHealthLabel);
panel.add(fireSpellBookLabel);
panel.add(iceSpellBookLabel);
panel.add(spiderLabel);
panel.add(appleLabel);
panel.add(fireMagicLabel);
panel.add(swordLabel);
// Character
panel.add(redCharacterLabel);
// Interface
panel.add(inventoryLabel);
panel.add(chatboxLabel);
// Background
panel.add(backgroundLabel);
frame.setContentPane(panel);
frame.getContentPane().invalidate();
frame.getContentPane().validate();
frame.getContentPane().repaint();
//I WOULD LIKE THE LOADING OF THE PANEL SOMEWHERE IN THIS CONSTRUCTOR.
new ResetEntities();
frame.repaint();
panel.setLayout(null);
Run.loadKeyListener();
Player.px = Connect.x;
Player.py = Connect.y;
new Mouse();
TextualMenu.rect = new Rectangle(Frame.inventoryLabel.getX() + 80,
Frame.inventoryLabel.getY() + 100,
Frame.inventoryLabel.getWidth(),
Frame.inventoryLabel.getHeight());
Player.startMessage();
}
Don't use static variables.
Don't use a null layout.
Use appropriate layout managers. Maybe the main panel uses a BorderLayout. Then you add your main component to the CENTER and a second panel to the EAST. The second panel can also use a BorderLayout. You can then add the two components to the NORTH, CENTER or SOUTH as you require.
For example, using a custom Border:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.RadialGradientPaint;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.border.AbstractBorder;
#SuppressWarnings("serial")
public class FrameEg extends JPanel {
public static final String FRAME_URL_PATH = "http://th02.deviantart.net/"
+ "fs70/PRE/i/2010/199/1/0/Just_Frames_5_by_ScrapBee.png";
public static final int INSET_GAP = 120;
private BufferedImage frameImg;
private BufferedImage smlFrameImg;
public FrameEg() {
try {
URL frameUrl = new URL(FRAME_URL_PATH);
frameImg = ImageIO.read(frameUrl);
final int smlFrameWidth = frameImg.getWidth() / 2;
final int smlFrameHeight = frameImg.getHeight() / 2;
smlFrameImg = new BufferedImage(smlFrameWidth, smlFrameHeight,
BufferedImage.TYPE_INT_ARGB);
Graphics g = smlFrameImg.getGraphics();
g.drawImage(frameImg, 0, 0, smlFrameWidth, smlFrameHeight, null);
g.dispose();
int top = INSET_GAP;
int left = top;
int bottom = top;
int right = left;
Insets insets = new Insets(top, left, bottom, right);
MyBorder myBorder = new MyBorder(frameImg, insets);
JTextArea textArea = new JTextArea(50, 60);
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
for (int i = 0; i < 300; i++) {
textArea.append("Hello world! How is it going? ");
}
setLayout(new BorderLayout(1, 1));
setBackground(Color.black);
Dimension prefSize = new Dimension(frameImg.getWidth(),
frameImg.getHeight());
JPanel centerPanel = new MyPanel(prefSize);
centerPanel.setBorder(myBorder);
centerPanel.setLayout(new BorderLayout(1, 1));
centerPanel.add(new JScrollPane(textArea), BorderLayout.CENTER);
MyPanel rightUpperPanel = new MyPanel(new Dimension(smlFrameWidth,
smlFrameHeight));
MyPanel rightLowerPanel = new MyPanel(new Dimension(smlFrameWidth,
smlFrameHeight));
top = top / 2;
left = left / 2;
bottom = bottom / 2;
right = right / 2;
Insets smlInsets = new Insets(top, left, bottom, right);
rightUpperPanel.setBorder(new MyBorder(smlFrameImg, smlInsets));
rightUpperPanel.setLayout(new BorderLayout());
rightLowerPanel.setBorder(new MyBorder(smlFrameImg, smlInsets));
rightLowerPanel.setBackgroundImg(createBackgroundImg(rightLowerPanel
.getPreferredSize()));
JTextArea ruTextArea1 = new JTextArea(textArea.getDocument());
ruTextArea1.setWrapStyleWord(true);
ruTextArea1.setLineWrap(true);
rightUpperPanel.add(new JScrollPane(ruTextArea1), BorderLayout.CENTER);
JPanel rightPanel = new JPanel(new GridLayout(0, 1, 1, 1));
rightPanel.add(rightUpperPanel);
rightPanel.add(rightLowerPanel);
rightPanel.setOpaque(false);
add(centerPanel, BorderLayout.CENTER);
add(rightPanel, BorderLayout.EAST);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private BufferedImage createBackgroundImg(Dimension preferredSize) {
BufferedImage img = new BufferedImage(preferredSize.width,
preferredSize.height, BufferedImage.TYPE_INT_ARGB);
Point2D center = new Point2D.Float(img.getWidth()/2, img.getHeight()/2);
float radius = img.getWidth() / 2;
float[] dist = {0.0f, 1.0f};
Color centerColor = new Color(100, 100, 50);
Color outerColor = new Color(25, 25, 0);
Color[] colors = {centerColor , outerColor };
RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);
Graphics2D g2 = img.createGraphics();
g2.setPaint(paint);
g2.fillRect(0, 0, img.getWidth(), img.getHeight());
g2.dispose();
return img;
}
private static void createAndShowGui() {
FrameEg mainPanel = new FrameEg();
JFrame frame = new JFrame("FrameEg");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.setResizable(false);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
#SuppressWarnings("serial")
class MyPanel extends JPanel {
private Dimension prefSize;
private BufferedImage backgroundImg;
public MyPanel(Dimension prefSize) {
this.prefSize = prefSize;
}
public void setBackgroundImg(BufferedImage background) {
this.backgroundImg = background;
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (backgroundImg != null) {
g.drawImage(backgroundImg, 0, 0, this);
}
}
#Override
public Dimension getPreferredSize() {
return prefSize;
}
}
#SuppressWarnings("serial")
class MyBorder extends AbstractBorder {
private BufferedImage borderImg;
private Insets insets;
public MyBorder(BufferedImage borderImg, Insets insets) {
this.borderImg = borderImg;
this.insets = insets;
}
#Override
public void paintBorder(Component c, Graphics g, int x, int y, int width,
int height) {
g.drawImage(borderImg, 0, 0, c);
}
#Override
public Insets getBorderInsets(Component c) {
return insets;
}
}
Which would look like:
I have this following combo box, where i am able to create my combo box with items etc, but the look is not same as JTextField. How can i make JCombobox look same like JTextField?
MyComboBox.java:
import java.awt.Color;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.basic.BasicComboBoxUI;
public class MyComboBox extends JComboBox {
public MyComboBox(String[] name) {
Border border = BorderFactory.createEmptyBorder(11, 11, 11, 11);
JComboBox cb = new JComboBox(name);
cb.setUI(new BasicComboBoxUI() {
#Override
protected JButton createArrowButton() {
return new JButton() {
#Override
public int getWidth() {
return 0;
}
};
}
});
setModel(cb.getModel());
setOpaque(false);
setBorder(new LineBorder(Color.black, 1, true));
//setBackground(Color.white);
setVisible(true);
}
// public void paintComponent(Graphics g) {
// super.paintComponent(g);
// g.setColor(new Color(red, green, blue) );
// g.fillOval(125, 125, 50, 50);
// }
}
best of all could be use Look and Feels
JComboBox has two states, JComboBox can be Editable and Non_Editable (default)
without CustomUI (as example by #aterai), but Look and Feel sensitive, only for Metal Look and Feel
import java.awt.*;
import java.util.Vector;
import javax.swing.*;
import javax.swing.UIManager;
import javax.swing.plaf.ColorUIResource;
import javax.swing.plaf.metal.MetalComboBoxButton;
public class MyComboBox {
private Vector<String> listSomeString = new Vector<String>();
private JComboBox someComboBox = new JComboBox(listSomeString);
private JComboBox editableComboBox = new JComboBox(listSomeString);
private JComboBox non_EditableComboBox = new JComboBox(listSomeString);
private JFrame frame;
public MyComboBox() {
listSomeString.add("-");
listSomeString.add("Snowboarding");
listSomeString.add("Rowing");
listSomeString.add("Knitting");
listSomeString.add("Speed reading");
//
someComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
someComboBox.setFont(new Font("Serif", Font.BOLD, 16));
someComboBox.setEditable(true);
someComboBox.getEditor().getEditorComponent().setBackground(Color.YELLOW);
((JTextField) someComboBox.getEditor().getEditorComponent()).setBackground(Color.YELLOW);
//
editableComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
editableComboBox.setFont(new Font("Serif", Font.BOLD, 16));
editableComboBox.setEditable(true);
JTextField text = ((JTextField) editableComboBox.getEditor().getEditorComponent());
text.setBackground(Color.YELLOW);
JComboBox coloredArrowsCombo = editableComboBox;
Component[] comp = coloredArrowsCombo.getComponents();
for (int i = 0; i < comp.length; i++) {
if (comp[i] instanceof MetalComboBoxButton) {
MetalComboBoxButton coloredArrowsButton = (MetalComboBoxButton) comp[i];
coloredArrowsButton.setBackground(null);
break;
}
}
//
non_EditableComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
non_EditableComboBox.setFont(new Font("Serif", Font.BOLD, 16));
//
frame = new JFrame();
frame.setLayout(new GridLayout(0, 1, 10, 10));
frame.add(someComboBox);
frame.add(editableComboBox);
frame.add(non_EditableComboBox);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(100, 100);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
UIManager.put("ComboBox.background", new ColorUIResource(Color.yellow));
UIManager.put("JTextField.background", new ColorUIResource(Color.yellow));
UIManager.put("ComboBox.selectionBackground", new ColorUIResource(Color.magenta));
UIManager.put("ComboBox.selectionForeground", new ColorUIResource(Color.blue));
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
MyComboBox aCTF = new MyComboBox();
}
});
}
}
I guess you are meaning RoundedCornerBorder:
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.basic.*;
public class RoundedComboBoxTest {
public JComponent makeUI() {
UIManager.put("Panel.background", Color.GRAY);
UIManager.put("ComboBox.foreground", Color.BLACK);
UIManager.put("ComboBox.background", Color.GRAY);
UIManager.put("ComboBox.selectionForeground", Color.WHITE);
UIManager.put("ComboBox.selectionBackground", Color.GRAY);
UIManager.put("ComboBox.buttonDarkShadow", Color.BLACK);
UIManager.put("ComboBox.border", new RoundedCornerBorder());
DefaultComboBoxModel<String> m = new DefaultComboBoxModel<>();
m.addElement("1234");
m.addElement("5555555555555555555555");
m.addElement("6789000000000");
JComboBox<String> combo = new JComboBox<>(m);
combo.setUI(new BasicComboBoxUI() {
#Override protected JButton createArrowButton() {
JButton b = super.createArrowButton();
b.setContentAreaFilled(false);
b.setBackground(Color.GRAY);
b.setBorder(BorderFactory.createEmptyBorder());
return b;
}
});
Object o = combo.getAccessibleContext().getAccessibleChild(0);
((JComponent)o).setBorder(
BorderFactory.createMatteBorder(0,1,1,1,Color.BLACK));
JPanel p = new JPanel(new BorderLayout());
p.add(combo, BorderLayout.NORTH);
p.setOpaque(true);
p.setBackground(Color.GRAY);
p.setBorder(BorderFactory.createEmptyBorder(15,15,15,15));
return p;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new RoundedComboBoxTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class RoundedCornerBorder extends AbstractBorder {
#Override public void paintBorder(
Component c, Graphics g, int x, int y, int width, int height) {
Graphics2D g2 = (Graphics2D)g.create();
g2.setRenderingHint(
RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int r = 12;
Area round = new Area(
new RoundRectangle2D.Float(x, y, width-1, height-1, r, r));
Rectangle b = round.getBounds();
b.setBounds(b.x, b.y + r, b.width, b.height - r);
round.add(new Area(b));
Container parent = c.getParent();
if(parent!=null) {
g2.setColor(parent.getBackground());
Area corner = new Area(new Rectangle2D.Float(x, y, width, height));
corner.subtract(round);
g2.fill(corner);
}
g2.setColor(Color.BLACK);
g2.draw(round);
g2.dispose();
}
#Override public Insets getBorderInsets(Component c) {
return new Insets(4, 8, 4, 8);
}
#Override public Insets getBorderInsets(Component c, Insets insets) {
insets.left = insets.right = 8;
insets.top = insets.bottom = 4;
return insets;
}
}
You will have to define your own custom renderer, check out this tutorial as how to define one.
You can also set your background and foreground in your MyComboBox.java but that will not have an impact on selected item foreground, background.