I am trying to develop a swing application which looks like the following :-
(The demo for this application can be found here)
The black square moves as the cursor is moved .The ComboBox entry selects the topmost layer in the stack,above which the square will appear during movement but below the remaining next top layers.
I have completed it nearly but the black square(image) is vibrating when mouse is moved (motion is not smooth) and also its motion is confined to small area and it is not moving over complete layered pane.Also there is no effect of changing settings in ComboBox or CheckBox.
Here is the code :-
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class JLayeredPaneDemo implements ActionListener, MouseMotionListener{
private String layerString[]={"Red(0)","Yellow(1)","Blue(2)","Green(3)","Orange(4)"};
private Color layerColors[]={Color.RED,Color.YELLOW,Color.BLUE,Color.GREEN,Color.ORANGE};
JComboBox jcb;
JCheckBox jcheck;
JLayeredPane layeredPane;
ImageIcon img;
JLabel cursor;
public static void main(String args[])
{
SwingUtilities.invokeLater(new Runnable(){public void run(){new JLayeredPaneDemo();}});
}
public JLayeredPaneDemo()
{
JFrame frame=new JFrame("JLayeredPane Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridLayout(2,1));
frame.add(createControlPanel());
//frame.add(Box.createRigidArea(new Dimension(0, 10)));
frame.add(createLayeredPane());
try
{
img=new ImageIcon(ImageIO.read(new File("src/watermark.png")));
}catch(IOException e){System.out.println("ERROR LOADING IMAGE :"+ e);}
cursor=new JLabel(img);
cursor.setBounds(45,45,img.getIconWidth(),img.getIconHeight());
cursor.addMouseMotionListener(this);
layeredPane.add(cursor,new Integer(2),0);
frame.pack();
frame.setVisible(true);
}
public JPanel createControlPanel()
{
JPanel panel=new JPanel();
panel.setBorder(BorderFactory.createTitledBorder("Select the Settings"));
jcb=new JComboBox(layerString);
jcb.setSelectedIndex(0);
jcb.setActionCommand("LAYER_SETTING");
jcb.addActionListener(this);
jcheck=new JCheckBox();
jcheck.setSelected(true);
jcheck.setActionCommand("FRONT_BACK");
jcheck.addActionListener(this);
panel.add(jcb);
panel.add(jcheck);
return panel;
}
public JLayeredPane createLayeredPane()
{
layeredPane=new JLayeredPane();
layeredPane.setBorder(BorderFactory.createTitledBorder("Layered Pane : Move Your Mouse"));
layeredPane.setPreferredSize(new Dimension(300,310));
Point origin=new Point(20,20);
int offset=35;
for(int i=0;i<layerString.length;i++)
{
JLabel label=createColoredLabel(layerString[i],layerColors[i],origin);
layeredPane.add(label,new Integer[i]);
origin.x+=offset;
origin.y+=offset;
}
return layeredPane;
}
private JLabel createColoredLabel(String str,Color color,Point origin)
{
JLabel label =new JLabel(str);
label.setVerticalAlignment(JLabel.TOP);
label.setHorizontalAlignment(JLabel.CENTER);
label.setOpaque(true);
label.setBackground(color);
label.setForeground(Color.BLACK);
label.setBorder(BorderFactory.createLineBorder(Color.BLACK));
label.setBounds(origin.x,origin.y,100,100);
return label;
}
public void actionPerformed(ActionEvent e)
{
String cmd=e.getActionCommand();
if(cmd.equals("LAYER_SETTING"))
{
int position=jcheck.isSelected() ? 0 :1;
layeredPane.setLayer(cursor,jcb.getSelectedIndex(),position);
}
else if(cmd.equals("FRONT_BACK"))
{
if(jcheck.isSelected())
layeredPane.moveToFront(cursor);
else
layeredPane.moveToBack(cursor);
}
}
#Override
public void mouseDragged(MouseEvent e) {
// TODO Auto-generated method stub
//Do nothing
}
#Override
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
cursor.setLocation(e.getX(),e.getY());
}
}
Please Help me to find the problem.
Your mouseMoved() implementation no longer applies the offsets used in the original; you'll need to supply them based on the geometry of the Icon used in your cursor.
//Adjustments to put Duke's toe at the cursor's tip.
private static final int XFUDGE = 40;
private static final int YFUDGE = 57;
...
//Make Duke follow the cursor.
public void mouseMoved(MouseEvent e) {
dukeLabel.setLocation(e.getX()-XFUDGE, e.getY()-YFUDGE);
}
Addendum: I don't understand why I didn't get any error when I used the wrong brackets? Can anyone point out the reason, please.
layeredPane.add(label,new Integer(i));
Because the language defines an array as an Object, the compiler chose the matching available add() method:
public void add(Component comp, Object constraints);
There are two silly mistakes which consumed my 11 precious hours.
1)I set actionListener for 'cursor' instead of layeredPane and that's why the movement was confined to a small area.
2)Secondly,i wrote layeredPane.add(label,new Integer[i]); instead of layeredPane.add(label,new Integer(i)); .(Notice the square brackets).
Related
Using LayerUI to add labels to the upper corner of a tabbed pane. Would like to allow these labels to display as hyperlinks, so I set the color blue, the cursor to a hand and I added a mouselistener.
Howev,er when I paint the component the cursor customization and mouse listener are not not working.
sample image
Sample Application:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JLayer;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.SwingUtilities;
import javax.swing.plaf.LayerUI;
public class TopRightCornerLabelLayerUITest {
public static JPanel makeUI() {
JPanel resultPanel = new JPanel();
resultPanel.setLayout( new BorderLayout());
resultPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.add("Tab 1", new JPanel());
tabbedPane.add("Tab 2", new JPanel());
resultPanel.add(new JLayer<JComponent>(tabbedPane, new TopRightCornerLabelLayerUI()), BorderLayout.CENTER);
return resultPanel;
}
private static void initandShow()
{
JDialog dialog = new JDialog();
dialog.getContentPane().add(makeUI());
dialog.setSize(520, 240);
dialog.setLocationRelativeTo(null);
dialog.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
initandShow();
}
});
}
}
class TopRightCornerLabelLayerUI extends LayerUI<JComponent> {
private JPanel rubberStamp = new JPanel();
#Override public void paint(Graphics g, JComponent c) {
super.paint(g, c);
JLabel layoutHyperlink = new JLabel("<html><a href=''>File Layout and Descriptions</a></html>");
JLabel templateHyperlink = new JLabel("<html><a href=''>Download Template</a></html>");
layoutHyperlink.setForeground(Color.BLUE.darker());
layoutHyperlink.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
layoutHyperlink.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
// the user clicks on the label
System.err.println("clicked");
}
});
templateHyperlink.setForeground(Color.BLUE.darker());
templateHyperlink.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
templateHyperlink.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
// the user clicks on the label
System.err.println("clicked");
}
});
// Add components
Dimension templateDimension = templateHyperlink.getPreferredSize();
int x = c.getWidth() - templateDimension.width - 5;
SwingUtilities.paintComponent(g, templateHyperlink, rubberStamp, x, 2, templateDimension.width , templateDimension.height);
Dimension layoutDimension = layoutHyperlink.getPreferredSize();
x = c.getWidth() - layoutDimension.width - 15 - templateDimension.width;
SwingUtilities.paintComponent(g, layoutHyperlink, rubberStamp, x, 2, layoutDimension.width, templateDimension.height);
}
}
I was actually unaware of class JLayer until I read your question. I don't have a complete answer but I think it's enough to give you a push in the right direction. I was helped by the lesson in Oracle's Java tutorial: How to Decorate Components with the JLayer Class. That lesson has a section entitled Responding to Events which helped me to figure out how to partially solve your issue. Basically you are just painting the labels and not actually adding them as components and therefore they will not respond to mouse events. Since the labels can be considered part of the JLayer component that is added as a component, you can configure that JLayer to respond to mouse events. As stated in the tutorial lesson, you need to override some other methods in your TopRightCornerLabelLayerUI class. The code below contains two of those methods. Add them to your code and see if they give you the expected result.
public void installUI(JComponent c) {
super.installUI(c);
((JLayer<?>) c).setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK);
}
protected void processMouseEvent(MouseEvent e, JLayer l) {
if (e.getID() == MouseEvent.MOUSE_CLICKED) {
Point pt = e.getPoint();
if (pt.x >= xTemplateHyperlink && pt.x <= (xTemplateHyperlink + widthTemplateHyperlink)) {
System.out.println("clicked");
}
}
}
EDIT:
Forgot to mention that I added the following members to your TopRightCornerLabelLayerUI class...
private int xTemplateHyperlink;
private int yTemplateHyperlink;
private int widthTemplateHyperlink;
private int heightTemplateHyperlink;
And set their values in method paint() like so...
Dimension templateDimension = templateHyperlink.getPreferredSize();
xTemplateHyperlink = c.getWidth() - templateDimension.width - 5;
yTemplateHyperlink = 2;
widthTemplateHyperlink = templateDimension.width;
heightTemplateHyperlink = templateDimension.height;
which explains the code in method processMouseEvent().
Pretty much, once I make my JTextArea and my JTextField transparent, as I type it looks as if all of my components are being duplicated and added to the screen. Am I doing something wrong, or is this a NetBeans bug?
package game;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
/**
*
* #author xDaegothx
*/
public class Game extends JFrame
{
JLayeredPane LP;
Game_Chat GC;
public Game()
{
LP = new JLayeredPane();
LP.setBackground(Color.black);
LP.setOpaque(true);
GC = new Game_Chat();
GC.setBounds(0,350,400,250);
LP.add(GC);
this.getContentPane().add(LP);
this.setBounds(0,0,1200,700);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
public static void main(String[] args)
{
new Game();
}
public class Game_Chat extends JLabel
{
JTextArea TA;
JScrollPane JSP;
JTextField TF;
JButton Submit_btn;
public Game_Chat()
{
TA = new JTextArea();
TA.setForeground(new Color(255,255,255,0));
TA.setBackground(new Color(255,255,255,0));
TA.setOpaque(true);
TA.setText("Welcome to 'Game'!");
JSP = new JScrollPane(TA);
JSP.setOpaque(true);
JSP.setForeground(new Color(255,255,255,0));
JSP.setBackground(new Color(255,255,255,0));
JSP.setBounds(0,0,400,225);
TF = new JTextField();
TF.setOpaque(true);
//TF.setBackground(new Color(255,255,255,0));
TF.setBounds(0,225,350,25);
Submit_btn = new JButton("Send");
Submit_btn.setBorder(null);
Submit_btn.setBounds(350,225,50,25);
TF.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent ae)
{
Submit();
}
});
Submit_btn.addMouseListener(new MouseAdapter()
{
#Override
public void mouseClicked(MouseEvent me)
{
Submit();
}
});
add(JSP);
add(TF);
add(Submit_btn);
setBackground(Color.gray);
setOpaque(true);
}
public void Submit()
{
String charname = "MyName";
TA.append("\n"+charname+": "+TF.getText());
}
}
}
What is the point of setting both the foreground and background transparent? You will never see the text if it is transparent!
Anyway to make a component completely transparent you don't play with the background. Instead you just use:
textArea.setOpaque(false);
If you want partially transparent backgrounds then you do use the setBackground() method. But you will have painting problems. See Backgrounds With Transparency for an explanation of the problems and some potential solutions.
Also, you should NOT be using setBounds() to set the size/location of a component. Swing was designed to be used with layout managers. So take the time to learn how to use them for better functioning programs.
I come to you because I have a strange issue, for which I don't find any solution...
I build an application using a webcam, in order to take some photographs.
I use WebcamCapture to do that, and I don't encounter any issues with it.
The only "weird" thing that happens is the following :
I use a JDialog in which I make photograph. In its JFrame parent, I display those photographs in JLabel.
Then, i need to disable those JLabel, and I do that by calling a method which disable all components. The weird thing is, when I disable JLabel, the JLabel display the last image capture by the webcam. Not the last photographs, but really the last captured image.
It's seems that BufferedImage (used by WebcamPanel) are linked to the issue.
Here is the SSCE :
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.Border;
import com.github.sarxos.webcam.Webcam;
import com.github.sarxos.webcam.WebcamPanel;
#SuppressWarnings("serial")
public class CameraFrame extends JFrame implements ActionListener{
public Webcam webcam;
Boolean enabled = true;
CameraFrame frame;
private JButton btnSaveVerso;
private JLabel lblVerso;
private JButton btnEnable;
private JButton btnQuit;
private JPanel mainPanel;
private WebcamPanel streamPanel;
public static void main(String[] args){
CameraFrame frame = new CameraFrame();
frame.setVisible(true);
}
public CameraFrame() {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
setLocationRelativeTo(null);
setResizable(false);
setMinimumSize(new Dimension(800, 600));
setPreferredSize(new Dimension(800,600));
buildPanel();
setContentPane(mainPanel);
}
});
}
public void buildPanel() {
mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.PAGE_AXIS));
Border blackline = BorderFactory.createLineBorder(Color.black, 1, true);
webcam = Webcam.getDefault();
webcam.open();
streamPanel = new WebcamPanel(webcam);
streamPanel.setPreferredSize(new Dimension(webcam.getViewSize()));
streamPanel.setMaximumSize(new Dimension(webcam.getViewSize()));
btnSaveVerso = new JButton("Take pic");
btnSaveVerso.setActionCommand("take");
btnSaveVerso.addActionListener(this);
lblVerso = new JLabel("Here will be the pic taken by the camera");
lblVerso.setBorder(blackline);
btnEnable = new JButton("Disable");
btnEnable.setActionCommand("disable");
btnEnable.addActionListener(this);
btnQuit = new JButton("Quit");
btnQuit.setActionCommand("quit");
btnQuit.addActionListener(this);
mainPanel.add(streamPanel);
mainPanel.add(btnSaveVerso);
mainPanel.add(lblVerso);
mainPanel.add(btnEnable);
mainPanel.add(btnQuit);
}
#Override
public void actionPerformed(final ActionEvent e) {
Thread newThread = new Thread(){
public void run(){
if(e.getActionCommand().equals("take")){
ImageIcon icon = new ImageIcon(webcam.getImage().getScaledInstance(100, 150, Image.SCALE_SMOOTH ));
lblVerso.setIcon(new ImageIcon(icon.getImage()));
lblVerso.revalidate();
lblVerso.repaint();
}
else if(e.getActionCommand().equals("disable")){
if(enabled){
lblVerso.setEnabled(false);
enabled = false;
btnEnable.setText("Enable");
}
else{
lblVerso.setEnabled(true);
enabled = true;
btnEnable.setText("Disable");
}
}
}
};
newThread.run();
if(e.getActionCommand().equals("quit")){
webcam.close();
this.setVisible(false);
}
}
}
I hope you will compile it without issues. Don't forget to link the librairies.
Thanks in advance
I finally resolved the problem : you simply need to close the webcam after each pictures, as follows :
BufferedImage picture = webcam.getImage();
webcam.close();
webcam.open();
... Do what you need with picture
(You don't even need to convert BufferedImage picture in an other type.)
I am very new to Java AWT. My question header must seem ridiculous to you, sorry about that. In my application I have three buttons which display different threads when clicked on. Now I want to add maybe a button or checkboxes or choicelist, etc when clicked on a particular button. For eg, if I click on yes button, it should display a choice list, something like that. How do I achieve something like that? Here is my code so far:
import java.awt.Button;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class AppWindow extends Frame implements ActionListener{
String keymsg = "Test message";
String mousemsg = "Nothing";
int mouseX=30, mouseY=30;
String msg;
public AppWindow(){
//addKeyListener(new MyKeyAdapter(this));
//addMouseListener(new MyMouseAdapter(this));
addWindowListener(new MyWindowAdapter());
}
public void paint(Graphics g){
g.drawString(msg, 150, 100);
}
//Here the window is created:
public static void main(String args[]){
AppWindow appwin = new AppWindow();
appwin.setSize(new Dimension(300,200));
appwin.setTitle("My first AWT Application");
appwin.setLayout(new FlowLayout(FlowLayout.LEFT));
appwin.setVisible(true);
Button yes,no,maybe;
yes = new Button("yes");
no = new Button("no");
maybe = new Button("maybe");
appwin.add(yes);
appwin.add(no);
appwin.add(maybe);
yes.addActionListener(appwin);
no.addActionListener(appwin);
maybe.addActionListener(appwin);
}
#Override
public void actionPerformed(ActionEvent ae) {
// TODO Auto-generated method stub
String str = ae.getActionCommand();
if(str.equals("yes")){
msg = "You pressed Yes";
}
if(str.equals("no")){
msg = "You pressed No";
}
if(str.equals("maybe")){
msg = "You pressed Maybe";
}
repaint();
}
}
class MyWindowAdapter extends WindowAdapter {
public void windowClosing(WindowEvent we){
System.exit(0);
}
}
Points describing what you should be doing :
As already mentioned by others, better to use Swing over AWT, since Swing is more advanced.
As much as possible, always try to Paint on top of a JPanel or a
JComponent, instead of Painting right on top of your JFrame, by
overriding the paintComponent(Graphics g) method of the said
JComponent/JPanel
Never call setVisible(true) on the JFrame until and unless it's
size has been established. So in general terms, this has to be the
last call, once you are done adding components to the JFrame and
the size of the JFrame has been realized by the LayoutManager.
Inside your actionPerformed(...), instead of writing all if
statement blocks, you should adhere to the if-else if statement
blocks. The benefit of this, over the former is that, at any given
time, only one event will be fired, hence once the said condition is
satisfied, you don't want your code to keep checking other
conditions, which in general is really not a good programming
practice, IMHO.
MOST IMPORTANT THING : Never make calls like pack()/setVisible(...) from within the main method, such calls belong
to the Event Dispatch Thread, and must be done on the same. Please
read Concurrency in Swing for more detail.
Have a look at the example program, for better understanding.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class ComponentExample
{
private CustomPanel drawingBoard;
private JPanel contentPane;
private JButton yesButton;
private JButton noButton;
private JButton maybeButton;
private JComboBox cbox;
private ActionListener buttonAction = new ActionListener()
{
#Override
public void actionPerformed(ActionEvent ae)
{
JButton button = (JButton) ae.getSource();
if (cbox.isShowing())
contentPane.remove(cbox);
if (button == yesButton)
{
drawingBoard.setText("You Pressed YES.");
contentPane.add(cbox, BorderLayout.PAGE_END);
}
else if (button == noButton)
drawingBoard.setText("You Pressed NO.");
else if (button == maybeButton)
drawingBoard.setText("You Pressed MAYBE.");
/*
* revalidate()/repaint() is needed
* when the JComponent is added or
* removed from the already
* visible Container.
*/
contentPane.revalidate();
contentPane.repaint();
}
};
public ComponentExample()
{
cbox = new JComboBox(
new String[]{"I GOT IT"
, "I STILL HAD DOUBT"});
}
private void displayGUI()
{
JFrame frame = new JFrame("Component Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = new JPanel();
contentPane.setOpaque(true);
contentPane.setBackground(Color.DARK_GRAY);
contentPane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(5, 5));
JPanel buttonPanel = new JPanel();
buttonPanel.setOpaque(true);
buttonPanel.setBackground(Color.WHITE);
yesButton = new JButton("YES");
yesButton.addActionListener(buttonAction);
noButton = new JButton("NO");
noButton.addActionListener(buttonAction);
maybeButton = new JButton("MAY BE");
maybeButton.addActionListener(buttonAction);
buttonPanel.add(yesButton);
buttonPanel.add(noButton);
buttonPanel.add(maybeButton);
contentPane.add(buttonPanel, BorderLayout.PAGE_START);
drawingBoard = new CustomPanel();
contentPane.add(drawingBoard, BorderLayout.CENTER);
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new ComponentExample().displayGUI();
}
});
}
}
class CustomPanel extends JPanel
{
private String msg;
public CustomPanel()
{
msg = "";
setOpaque(true);
setBackground(Color.WHITE);
}
public void setText(String msg)
{
this.msg = msg;
repaint();
}
#Override
public Dimension getPreferredSize()
{
return (new Dimension(300, 300));
}
#Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawString(msg, getWidth() / 3, getHeight() / 3);
}
}
I don't know if I have understood the question well but... couldn't you create those elements and call their setVisible(boolean) methods to make them not visible at first, and them make them visible when user pushes buttons?
I want to draw the lines between 2 JScrollPanes (first scroll pane on the left side, second on the right). These JScrollPanes contain images. I want to draw lines between these 2 images (use some layers, use some trick etc.). I tried do it different ways, but i failed. Is it possible? (if not, i will have to make 2 images in one JScrollPane and it won't be nice).
EDIT
I want to draw between 2 images - throught components - get some points from images and draw lines between them. I apologize for poorly formulated question.
In order to accomplish this, I believe you'll need to make use of the Glass Pane. The Glass Pane sits on top of everything in the JRootPane and fills the entire view. This particular position allows two distinct capabilities:
Intercepting mouse and keyboard events
Drawing over the entire user interface
I believe your question is addressed by the second capability. The following is an example implementation, which you can later tailor to meet your own needs. Note that I've left out a lot of detail with regard to Glass Pane that you'll need to research on your own.
CODE
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class GlassPaneDemo {
private static BufferedImage bi;
public static void main(String[] args){
try {
loadImages();
SwingUtilities.invokeLater(new Runnable(){
#Override
public void run() {
createAndShowGUI();
}
});
} catch (IOException e) {
// handle exception
}
}
private static void loadImages() throws IOException{
bi = ImageIO.read(new File("src/resources/person.png"));
}
private static void createAndShowGUI(){
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setGlassPane(new CustomGlassPane());
frame.getContentPane().add(getButtonPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.getGlassPane().setVisible(true);
frame.setVisible(true);
}
private static final JPanel getButtonPanel(){
#SuppressWarnings("serial")
final JPanel panel = new JPanel(){
#Override
protected void paintComponent(Graphics g){
Graphics gCopy = g.create();
gCopy.setColor(Color.BLUE.darker());
gCopy.fillRect(0, 0, getWidth(), getHeight());
gCopy.dispose();
}
};
final JLabel labelOne = new JLabel();
labelOne.setIcon(new ImageIcon(bi));
final JLabel labelTwo = new JLabel();
labelTwo.setIcon(new ImageIcon(bi));
panel.add(labelOne);
panel.add(labelTwo);
return panel;
}
#SuppressWarnings("serial")
private static class CustomGlassPane extends JComponent{
private Point p1;
private Point p2;
private boolean lineDrawn;
public CustomGlassPane(){
addMouseListener(new MouseAdapter(){
#Override
public void mouseClicked(MouseEvent e){
if(p1 == null || lineDrawn){
if(lineDrawn){
p1 = null;
p2 = null;
lineDrawn = false;
}
p1 = e.getPoint();
}else{
p2 = e.getPoint();
repaint(); // not optimal
lineDrawn = true;
}
}
});
// Block all other input events
addMouseMotionListener(new MouseMotionAdapter(){});
addKeyListener(new KeyAdapter(){});
addComponentListener(new ComponentAdapter(){
#Override
public void componentShown(ComponentEvent e){
requestFocusInWindow();
}
});
setFocusTraversalKeysEnabled(false);
}
#Override
protected void paintComponent(Graphics g){
if(p1 != null && p2 != null){
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(Color.RED);
g2.drawLine((int)p1.getX(), (int)p1.getY(), (int)p2.getX(), (int)p2.getY());
g2.dispose();
}
}
}
}
OUTPUT
EXPLANATION
In this example, I clicked two arbitrary points within each JLabel, and then drew a connecting line.
This should be very possible. You will need to create a custom component that is aware of both vertical ScrollBars. It should add itself as an AdjustmentListener to each scroll bar in order to detect changes and repaint the lines between the two.
See:
addAdjustmentListener method in the API
You can use this
http://java-sl.com/connector.html
as an example of such code.