Currently, the code is:
JFrame frame = new JFrame("App");
frame.setSize(1200, 800);//Give it a size
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);//Make it go away on close
JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEFT)); //TU ZMIENIAC
frame.add(panel);//Add it to your frame
(...)
JPanel panelForm = new JPanel(new GridBagLayout());
panel.add(panelForm);
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(10,10,10,10);
c.gridx = 0;
c.gridy = 0;
c.anchor = GridBagConstraints.LINE_END;
(...)
panelForm.add(label_pageCount, c);
c.gridy++;
try {
URL url = new URL(JSONLists.thumbnail.get(page));
BufferedImage image = ImageIO.read(url);
JLabel label = new JLabel(new ImageIcon(image));
panelForm.add(label);
} catch (Exception exp) {
exp.printStackTrace();
}
Which results in:
Every Jlabel is put properly in its place on the grid, except the image which appears in top right corner instead of assigned place.
In this part:
try {
URL url = new URL(JSONLists.thumbnail.get(page));
BufferedImage image = ImageIO.read(url);
JLabel label = new JLabel(new ImageIcon(image));
panelForm.add(label); //here
} catch (Exception exp) {
exp.printStackTrace();
}
you add the component to the container without the GridBagConstratints. That's why the component is not being added in the proper location. So, changing it to:
panelForm.add(label,c); //Add with constraints
will fix it.
I am creating a program that display text using JTextArea and setLineWrap and then i want just three line display, but i don't know how set line limit.
I tried to used getColumn from TextArea, but that's not work.
that's just created new line forever
I wanted this:
But my result is this:
class FrameMaker extends JTextArea{
FrameMaker() {
JFrame frame = new JFrame();
JLabel label = new JLabel();
JPanel panel = new JPanel();
JTextArea area = new JTextArea(3, 10);
Dimension dms = new Dimension(500, 200);
int num = 0;
Font font = new Font("궁서", 1, 12);
frame.setPreferredSize(dms);
frame.pack();
frame.add(panel);
frame.setVisible(true);
panel.add(area);
area.setLineWrap(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
int cnt = 1;
while(true) {
if(cnt == 10)
cnt = 1;
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
TextTester.Text.append(cnt);
area.setText(TextTester.Text.toString());
cnt++;
}
}
I have a GridBagConstraints gbcImage and a JLabel that is initialized like this:
gbcImage.gridx = 1; // column 0
gbcImage.gridy = 2; // row 2
gbcImage.ipady = 100;
gbcImage.ipadx = 100;
JLabel label = new JLabel("", null, JLabel.CENTER);
label.setOpaque(true);
label.setBackground(Color.WHITE);
panel.add(label, gbcImage);
Where panel is added to a JFrame.
So I implemented a MouseListener to the label:
public void mouseClicked(MouseEvent e) {
JFileChooser jfc = new JFileChooser();
int iRet = jfc.showOpenDialog(panel);
if (iRet == jfc.APPROVE_OPTION)
{
File file = jfc.getSelectedFile();
try
{
BufferedImage bi = ImageIO.read(file);
image = new ImageIcon(bi);
JLabel label = new JLabel("", image, JLabel.CENTER);
panel.add(label, gbcImage);
}
catch (IOException e1)
{
e1.printStackTrace();
}
}
}
But it didn't work. The image doesn't show in the panel at runtime.
What am I missing?
There is no need to create a new JLabel. The problem is you added a new label to the panel but its default size is (0, 0) because you didn't reavalidate() and repaint() the panel.
There is no need to create a new label.
Instead you keep a reference to the original label (like you do for the panel) and then you just replace the icon:
image = new ImageIcon(bi);
label.setIcon( image );
Good time of the day, I'm trying to add scrolls to the GridBagLayout but definitely missing the correct way to do it.
The code:
public GUI(Map map)
{
//declare image icons and try to read them
ImageIcon missing = new ImageIcon();
ImageIcon wall = new ImageIcon();
ImageIcon floor = new ImageIcon();
//set texture for missing cases
try
{
Image tempImage = ImageIO.read(this.getClass().getResource("/resources/images/missing.png"));
missing = new ImageIcon(tempImage.getScaledInstance(16, 16, Image.SCALE_DEFAULT));
}
catch(Exception e)
{
e.printStackTrace();
}
try
{
Image tempImage = ImageIO.read(this.getClass().getResource("/resources/images/wall.png"));
wall = new ImageIcon(tempImage.getScaledInstance(16, 16, Image.SCALE_DEFAULT));
tempImage = ImageIO.read(this.getClass().getResource("/resources/images/floor.png"));
floor = new ImageIcon(tempImage.getScaledInstance(16, 16, Image.SCALE_DEFAULT));
}
catch(Exception e)
{
e.printStackTrace();
}
Container pane = getContentPane();
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
for (int i=0;i<map.getMapSize();i++)
{
for (int j=0;j<map.getMapSize();j++)
{
c.gridy=i;
c.gridx=j;
if (i==0 && j==0)
{
c.weightx=1;
c.weighty=1;
}
else
{
c.weightx=0;
c.weighty=0;
}
c.gridwidth=1;
c.gridheight=1;
c.fill = GridBagConstraints.BOTH;
JLabel tile = new JLabel(missing);
if (map.getElementAt(i, j)==0)
{
tile.setIcon(wall);
}
else
{
tile.setIcon(floor);
}
pane.add(tile, c);
}
}
//c.gridx=map.getMapSize();
JScrollPane thePane = new JScrollPane();
pane.add(thePane, c);
setTitle("Game GUI");
setSize(640, 480);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
As far as I understand adding JScrollPane just after filling the pane is incorrect and of course it fails. The question is: how to add them correctly in this case? The aim overall I'm trying to achieve is to be able to scroll (move) the map in the game if it exceeds the game window size.
Thanks in advance:)
I guess the issue is that you try to add the GridBagConstraints to the JScollPane instead of adding your JPanel....
JScrollPane thePane = new JScrollPane();
pane.add(thePane, c);
try this:
JPanel myMapPanel = new Jpanel();
myMapPanel.setLayout(new GridBagLayout());
// add all the stuff to myMapPanel here (do the looping stuff here)
JScrollPane thePane = new JScrollPane(myMapPanel);
pane.add(thePane, c);
take care of this:
new JScrollPane(myMapPanel);
I'm creating a gui that has 2 panels. When the gui is first loaded only one panel is visible and when a button is pressed the new panel is displayed. The problem is that on the 2nd panel when it loads the buttons are invisible and only display when the mouse hovers over them. On top of that when you move the screen they become invisible again and need to be hovered over to be displayed again.
I really don't know what to try as I have looked at methods of having multiple panels and this seems the best way to do it and aswell as this the buttons are implmented the same way I have implemented them for the 1st panel and they render correctly.
Full Code
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Gui {
private JFrame frame;
private JPanel panel1;
private JPanel panel2;
private JButton btnShip1, btnShip2, btnShip3, btnTutorial, btnLeftControl, btnHull, btnTargeting, btnRadar, btnWarning, btnRightControl;
private JTextField txtCharacterName, txtShipName;
private JLabel welcome, background;
public static void main(String[] args) {
new Gui();
}
public Gui(){
createWindow();
addButtons();
addFields();
addWelcome();
frame.add(panel1);
frame.setVisible(true);
addBackground();
addShipControls();
}
public void createWindow(){
frame = new JFrame();
frame.setTitle("Space Battle");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(642, 518);
panel1 = new JPanel();
panel1.setLayout(null);
panel1.setBackground(Color.decode("#242627"));
panel2 = new JPanel();
panel2.setLayout(null);
panel2.setBackground(Color.decode("#242627"));
}
public void addButtons(){
btnShip1 = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/cruiserSelectBtn.jpg");
btnShip1.setIcon(img);
}
catch (Exception e) {}
try
{
ImageIcon img = new ImageIcon ("resources/button_1_hover.gif");
btnShip1.setRolloverIcon(img);
}
catch (Exception e) {}
btnShip1.setBounds(246,0,380,160);
btnShip1.setMargin(new Insets(0, 0, 0, 0));
btnShip1.addActionListener(new cruiserSelectHandler());
btnShip1.setBorder(null);
panel1.add (btnShip1);
btnShip2 = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/fighterSelectBtn.jpg");
btnShip2.setIcon(img);
}
catch (Exception e) {}
try
{
ImageIcon img = new ImageIcon ("resources/button_2_hover.gif");
btnShip2.setRolloverIcon(img);
}
catch (Exception e) {}
btnShip2.setBounds(246,160,380,160);
btnShip2.setMargin(new Insets(0, 0, 0, 0));
btnShip2.addActionListener(new fighterSelectHandler());
btnShip2.setBorder(null);
panel1.add (btnShip2);
btnShip3 = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/battleSelectBtn.jpg");
btnShip3.setIcon(img);
}
catch (Exception e) {}
try
{
ImageIcon img = new ImageIcon ("resources/button_3_hover.gif");
btnShip3.setRolloverIcon(img);
}
catch (Exception e) {}
btnShip3.setBounds(246,320,380,160);
btnShip3.setMargin(new Insets(0, 0, 0, 0));
btnShip3.addActionListener(new battleSelectHandler());
btnShip3.setBorder(null);
panel1.add (btnShip3);
btnTutorial = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/tutorialBtn.jpg");
btnTutorial.setIcon(img);
}
catch (Exception e) {}
btnTutorial.setBounds(5,426,234,49);
btnTutorial.setMargin(new Insets(0, 0, 0, 0));
panel1.add (btnTutorial);
}
public void addFields(){
txtCharacterName = new JTextField("Insert Character Name");
txtCharacterName.setBounds(12,260,220,35);
panel1.add(txtCharacterName);
txtShipName = new JTextField("Insert Ship Name");
txtShipName.setBounds(12,315,220,35);
panel1.add(txtShipName);
}
public void addWelcome(){
welcome = new JLabel ();
try
{
ImageIcon img = new ImageIcon ("resources/welcome.jpg");
welcome.setIcon(img);
}
catch (Exception e) {}
welcome.setBounds(0,0,247,229);
panel1.add(welcome);
}
//Class used to change panels
class cruiserSelectHandler implements ActionListener {
public void actionPerformed(ActionEvent even) {
frame.add(panel2);
panel1.setVisible(false);
}
}
class fighterSelectHandler implements ActionListener {
public void actionPerformed(ActionEvent even) {
frame.add(panel2);
panel1.setVisible(false);
}
}
class battleSelectHandler implements ActionListener {
public void actionPerformed(ActionEvent even) {
frame.add(panel2);
panel1.setVisible(false);
}
}
public void addBackground(){
//Is the background interfering?
background = new JLabel ();
try
{
ImageIcon img = new ImageIcon ("resources/background.jpg");
background.setIcon(img);
}
catch (Exception e) {}
background.setBounds(0,0,640,480);
panel2.add(background);
}
//Class used to add controls/buttons
public void addShipControls(){
btnLeftControl = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/left_controls.png");
btnLeftControl.setIcon(img);
}
catch (Exception e) {}
btnLeftControl.setBounds(-8,319,131,160);
btnLeftControl.setMargin(new Insets(0, 0, 0, 0));
btnLeftControl.setBorder(null);
panel2.add (btnLeftControl);
btnHull = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/hull_controls.png");
btnHull.setIcon(img);
}
catch (Exception e) {}
btnHull.setBounds(123,319,91,160);
btnHull.setMargin(new Insets(0, 0, 0, 0));
btnHull.setBorder(null);
panel2.add (btnHull);
btnTargeting = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/targeting_controls.png");
btnTargeting.setIcon(img);
}
catch (Exception e) {}
btnTargeting.setBounds(214,319,202,160);
btnTargeting.setMargin(new Insets(0, 0, 0, 0));
btnTargeting.setBorder(null);
panel2.add (btnTargeting);
btnWarning = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/warning_controls.png");
btnWarning.setIcon(img);
}
catch (Exception e) {}
btnWarning.setBounds(416,411,86,68);
btnWarning.setMargin(new Insets(0, 0, 0, 0));
btnWarning.setBorder(null);
panel2.add (btnWarning);
btnRadar = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/radar_idea.gif");
btnRadar.setIcon(img);
}
catch (Exception e) {}
btnRadar.setBounds(416,319,86,92);
btnRadar.setMargin(new Insets(0, 0, 0, 0));
btnRadar.setBorder(null);
panel2.add (btnRadar);
btnRightControl = new JButton ();
try
{
ImageIcon img = new ImageIcon ("resources/right_controls.png");
btnRightControl.setIcon(img);
}
catch (Exception e) {}
btnRightControl.setBounds(502,319,131,160);
btnRightControl.setMargin(new Insets(0, 0, 0, 0));
btnRightControl.setBorder(null);
panel2.add (btnRightControl);
}
}
when a button is pressed the new panel is displayed.
The problem is:
you are using a null layout
you are add two different panels to the frame.
By default Swing paints components in the reverse order that they were added.
So when you add panel1, it is the only panel of the frame so it is painted.
Then you click a button and add panel2. So Swing paints panel2 and then repaints panel1 on top, so panel2 is hidden. When you mouse over the button it appears because buttons listen for mouseEntered events and the button gets repainted.
When you resize the screen panel2 is painted and then panel1 is painted so you have the problem again.
The solution is to use a proper layout manager. In your case you should be using a Card Layout. The Card Layout will swap panels making sure only one panel is ever visible at a time. Read the Swing tutorial on Using Card Layout. Then get rid of all the null layouts and setBounds() methods.