Is it possible to overlay a Button over a Label in Swing?
For example, if have a JLabel with image and no text, and i want to overlay my button over this JLabel. Label is defined something like:
myLabel = new javax.swing.JLabel(new ImageIcon( myPicture ));
If not, then any ideas how can i realize this, thank you.
EDIT: Actually i read about adding JPanel to a JLabel, when i add a Panel with button layout, it compiles fine but nothing is visible, just the JLabel with image
UPDATE: As suggested by #paranoid-android, somehow i have solved my problem. However i still have to know how can i customize the positions of components overlayed on top of JLabel as i don't have much control (probably because normally i use netbeans for drawing layouts, and this would require hard coding).
Something Like this worked:
ImagePanel(Image image, int id) {
this.image = image;
this.tile = false;
JButton backButton = new JButton();
JButton nextButton = new JButton();
backButton.setText(" BACK ");
nextButton.setText(" NEXT ");
add(backButton);
add(nextButton);
};
#Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, getWidth(), getHeight(), this);
}
You can do it using a JLayeredPane, although if I understand correctly, the absolute best way to do that would be to override paintComponent:
// as part of your JPanel
#Override
public void paintComponent(Graphics g){
super.paintComponent(g);
g.drawImage(background, 0, 0, this);
}
Then you can add components to the panel as you like, without the need for the JLabel.
You can overlap the button and the label, but you would have to do this with a Fixed Layout. You might be able to pull if off with a gridBagLayout, but I doubt it.
Here is more on what you will need.
http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html
Thanks rtheunissen.
That did the trick for me.
I modified it a little.
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g); //To change body of generated methods, choose Tools | Templates.
try {
ImageIcon icon = new ImageIcon(getClass().getClassLoader().getResource("img/lake.jpeg"));
g.drawImage(icon.getImage(),0,0,this);
} catch (Exception ex) {
Logger.getLogger(InfoPanel.class.getName()).log(Level.SEVERE, null, ex);
}
}
Related
I am writing a program that consists of three different panels.
This is part of my bottom panel. I display an image using BufferedImage, and I would like to create some text that will appear around 350px into the image, and 15px down. I cannot manage to get this to work and overlay over the bufferedImage.
My current code is as follows (For the bottom panel):
public class BtmPanel extends JPanel {
BtmPanel(){
try {
JLabel imgLabel = new JLabel();
final BufferedImage img = ImageIO.read(new File("image.png"));
ImageIcon icon = new ImageIcon(img);
imgLabel.setIcon(icon);
this.add(imgLabel);
}
catch(IOException ie){
System.out.println("image does not exist");
}
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawString("Y: " + MiddlePanel.y ,350,15);
}
}
There are a couple of ways you might achieve this, depending on your needs and desires.
For example, rather than using a JLabel to display the image, you could paint it directly yourself, for example...
public class BtmPanel extends JPanel {
private BufferedImage image;
BtmPanel(){
try {
image = ImageIO.read(new File("image.png"));
}
catch(IOException ie){
System.out.println("image does not exist");
}
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (image != null) {
g.drawImage(0, 0, image, this);
}
g.drawString("Y: " + MiddlePanel.y ,350,15);
}
}
The reason for doing it this way is you don't (really) control the placement of the image within a JLabel (lots of things can affect it's positioning).
Another solution would be to draw the text directly onto the BufferedImage itself. Which you would use would depend on how dynamic the text might be and a bunch of other factors
A way to do this is doing the exact inverse of your example, overriding the JPanel's paint method painting a BufferedImage (creating a background with your image), and then you can normally add the JLabel with text on your JPanel extension.
Please note that if JPanel is resized and you don't want to have a bad quality background, you'll have to manually create a resized version to adapt the container, or, at least, resize your buffered image with a little logic to keep Width/Height ratio... not that easy!
For the basic version you can try something like the following (taken from a working example) paintComponent overridden function:
#Override
protected void paintComponent(Graphics g) {
Image background = backgroundImage.getScaledInstance(this.getWidth(), this.getHeight(), Image.SCALE_DEFAULT);
super.paintComponent(g);
if (backgroundImage != null) {
g.drawImage(background, 0, 0, null);
}
}
Hope this helps ;)
I am trying to draw an image to a JPanel which in turn is added to a JFrame, see here:
JFrame screen;
public void welcome(){
screen = new JFrame("Welcome");
screen.setVisible(true);
screen.pack();
screen.setBackground(Color.darkGray);
screen.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
// in the original code there is series of methods here that eventually calls the drawBoard() method
public void drawBoard(){
try {
final BufferedImage gboard = ImageIO.read(new File("cutsomGameBoard.jpg"));
final BufferedImage featPanel = ImageIO.read(new File("extraPanel.png"));
board = new JPanel(){
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(gboard, 0, 0, this);
}
};
extra = new JPanel(){
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(featPanel, 0, 0, this);
}
};
board.setSize(480, 480);
extra.setSize(480, 320);
}
catch (IOException e) {
e.printStackTrace();
}
}
gameScreen.add(toolbar, BorderLayout.PAGE_START);
gameScreen.add(board, BorderLayout.EAST);
gameScreen.add(extra, BorderLayout.WEST);
gameScreen.setVisible(true);
screen.add(gameScreen);
}
My problem is that when running the code, only a small corner of the buffered image is visible and I am not sure if it is a problem with the frame layout, the panel size or the drawImage method arguments, ideas?
P.S. The output: screenshot of java window
You didn't override the getPreferredSize() method of your custom component so the default size is basically (10, 10) which is the size of a panel using a FlowLayout with no added components.
Don't use a JPanel to display an image. Or if you do want to use a JPanel then you need to implement the getPreferredSize() method to return the size of your image.
The easiest solution is to just use a JLabel with an ImageIcon.
Read the section from the Swing tutorial on How to Use Icons for more information and working examples.
I am trying to add an Icon to the JButton
When I try to do this my Layout Manager (I use GridBagLayout) resizes the button and makes it larger by the size of the icon.
Is there a way to avoid this?
You could try JButton#setPreferedSize(...)
Or you could override the paintComponent method:
JButton testButton = new JButton() {
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, null);
}
};
If you want to do this with multiple buttons, it would be better to make a class for it ofcourse, something like:
class ImageButton extends JButton {
private final Image image;
public ImageButton(Image image) {
this.image = image;
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
//drawing logic here
}
}
I had the same problem. Do these things:
Resize your image to fit the button with an image manipulating program.
use setMininumSize() and set the minimum size you want.
This will probably fix your problem.
I have created a custom JPanel class called ImagePanel. I override the paintComponent method like this...
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawImage(image, 0,0, null);
}
The purpose of the custom panel is to simply draw an image.
In my JFrame, I create a ScollPane that is added to the JFrame. When I created the ScrollPane though, I pass in the instance of my imagePanel, like this...
ip = new ImagePanel();
JScrollPane jsp = new JScrollPane(ip);
this.add(jsp);
Now all I want as an easy to use way of using the scroll bars to scroll over my image. Right now the image is very large and scrollbars do not appear. I use the policy to make them visible, but the handles to the scrollbars are not there.
Does anyone know an easy way to do this?
Try with JPanel#setPreferredSize() that will force the JScrollPane to show the scroll bar if needed.
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawImage(image, 0,0, null);
// set the size of the panel based on image size
setPreferredSize(new Dimension(image.getWidth(), image.getHeight()));
}
EDIT
Setting setPreferredSize() inside overridden paintComponent() is not a good way.
You can do it in a simpler way using JLabel as suggested by #mKorbel. For more info have a look at the comments below.
BufferedImage image = ...
JLabel label = new JLabel(new ImageIcon(image)); // set the icon
JScrollPane jsp = new JScrollPane(label);
Screenshot:
I have a Problem:
I'm rendering a BufferedImage in a JFrame. Then i add a JButton to the same frame.
when i try to make the button transparent, the button becomes transparent, but disregarding its actual position, its always transparent like it is stuck in the top left corner of the frame.
I testet some different methods to make the button transparent, always with the same result.
any ideas?
thanks
public class TestPanel extends JPanel {
public TestPanel(){
JButton foo = new JButton("test");
foo.setBackground(new Color(0, 0, 0, 0));
foo.setBounds(20, 100, 300, 50);
this.add(foo);
}
public void paint(Graphics g){
Graphics2D g2 = (Graphics2D) g;
g2.drawImage(ImageFactory.getImg(), 0, 0, null); //get a BufferedImage
g2.dispose();
}
}
I see several problems, even if I'm not sure on which of them cause your problem.I try to list them in order:
Your TestPanel doesn't specify a LayoutManager (I hope you are specifying it somewhere else in your code).
You are extending a JPanel without call super paintComponent method (don't use paint). You should do this before anything else in your paintComponent method:
public void paintComponent(Graphics g){
super.paintComponent(g);
}
remove the dispose method call. You must not destroy your graphic object.
EDIT:
this is a problem:
foo.setBounds(20, 100, 300, 50);
you are trying to explicitly set the bounds of your JButton. You shouldn't do that. If you are using a LayoutManager it probably ignore this directive. If you are using a null layout this could be a problem too.
Several problems
it's wrong to override paint, instead override paintComponent
the button has a fully transparent background but returns true for opaque, thus fooling the paint mechanism
it's wrong to dispose the Graphics passed in as parameter
working code (Edit: accidentally removed the transparent color-setting line, fixed)
public TestPanel(){
JButton foo = new JButton("test");
foo.setBackground(new Color(0, 0, 0, 0));
foo.setOpaque(false);
foo.setBorder(BorderFactory.createLineBorder(Color.RED));
this.add(foo);
}
#Override
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.drawImage(ImageFactory.getImg(), 0, 0, null); //get a BufferedImage
// g2.dispose();
}
As others already noted: LayoutManagers are a must in Swing/AWT - not using them makes the ui code brittle and hard to maintain.
setBound() will work only if you have set your layout to null. Your code does not say anything like that.
Now, the default layout manager of JPanel is FlowLayout. By default, this layout manager will arrange your components from left to right then top to bottom.
Now, to make your code work as expected. Add this line inside your constructor: setLayout(null).
But remember, setting the layout to null is a very poor practice.
Also, the points Heisenbug has mentioned are very worthy. Try to follow them.