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PODrawing on JPanel behind GlassPane when clicking on GlassPane
 

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  1. PODrawing on JPanel behind GlassPane when clicking on GlassPane
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    <p>Okay So I looked through multiple forums and Google and couldn't find an answer to my specific problem. So I have two panels stacked on top of each other and the one on top is a glassPane. When you drag your mouse around the glassPane it draws a vertical red line at the cursor,which works, but when I click on the glassPane I want it it draw a black line at the cursor position on the panel below the glassPane. I can get it to redirect the mouseClick to the bottom panel but it wont draw the line. It just makes the redline disappear until you move the mouse again. Also If I set the glassPane invisible and click on the bottom panel the line is drawn so the drawing code works just fine. Thanks in advance.</p> <p>Main Class</p> <pre><code>import java.awt.AWTException; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.Robot; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.JButton; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.geom.Line2D; import java.awt.event.MouseMotionAdapter; import java.util.ArrayList; public class LiveField extends JPanel { /** * Create the panel. */ static JFrame frame; static JPanel ContentPane; private JPanel panel; private MyGlassPane glassPane; public static void main(String[] args) throws AWTException { LiveField live = new LiveField(); frame.setVisible(true); } public LiveField() throws AWTException { frame = new JFrame("Test"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(1000, 433); setLayout(new BorderLayout(0, 0)); ContentPane = new JPanel(); frame.setContentPane(ContentPane); ContentPane.setLayout(new BorderLayout(0, 0)); panel = new JPanel() { public void paintComponent(Graphics g) { super.paintComponent(g); panel.setBackground(new Color(50,160,55)); } }; glassPane = new MyGlassPane(panel); frame.setGlassPane(glassPane); glassPane.setVisible(true); panel.addMouseListener(new MouseAdapter() { int[] pos = new int[2]; @Override public void mouseClicked(MouseEvent e) { System.out.println("Handles click event"); Graphics g = panel.getGraphics(); g.setColor(new Color(50,165,55)); g.drawLine(pos[0], pos[1], 0+pos[0], 0);//to top g.drawLine(pos[0], pos[1], 0+pos[0], panel.getHeight());//to bottom int y = e.getYOnScreen(); int x = e.getXOnScreen(); pos[0]= x; pos[1] = y; g.setColor(new Color(0,0,0)); g.drawLine(x, y, 0+x, 0);//to top g.drawLine(x, y, 0+x, panel.getHeight());//to bottom g.dispose(); } }); ContentPane.add(panel, BorderLayout.CENTER); } </code></pre> <p>GlassPane Class</p> <pre><code>import java.awt.AWTException; import java.awt.Color; import java.awt.Component; import java.awt.Container; import java.awt.Graphics; import java.awt.Point; import java.awt.Robot; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import java.util.ArrayList; import javax.swing.JComponent; class MyGlassPane extends JComponent implements ItemListener { Point point; protected void paintComponent(Graphics g) { } public void setPoint(Point p) { point = p; } public MyGlassPane(final Container contentPane) throws AWTException { final Component glass = this; addMouseMotionListener(new MouseMotionListener() { ArrayList&lt;Integer&gt; line = new ArrayList&lt;Integer&gt;(); Robot rb = new java.awt.Robot(); @Override public void mouseMoved(MouseEvent e) { //System.out.println("Moving"); Graphics g = glass.getGraphics(); if(!line.isEmpty()) { //System.out.println("line is not empty"); g.setColor(new Color(50,160,55)); g.drawLine(line.get(0), line.get(1), 0+line.get(0), 0);//to top g.drawLine(line.get(0), line.get(1), 0+line.get(0), contentPane.getHeight());//to bottom } //System.out.println("draw line"); int x = e.getXOnScreen(); int y = e.getYOnScreen(); Color col = rb.getPixelColor(x, y); //System.out.println(col.toString() + " : " + Color.white.toString()); //System.out.println(col.equals(new Color(255,255,255))); if(!col.equals(new Color(255,255,255)) &amp;&amp; !inEndZone(x)) { g.setColor(new Color(255,0,0)); line = new ArrayList&lt;Integer&gt;(); line.add(x);line.add(y); g.drawLine(x, y, 0+line.get(0), 0);//to top g.drawLine(x, y, 0+line.get(0), contentPane.getHeight());//to bottom } g.dispose(); } private boolean inEndZone(int x) { int ends = contentPane.getWidth()/10; //System.out.println(x + " : " + ends); if(x&lt;ends) { //System.out.println("In endzone"); return true; } else if(x&gt;contentPane.getWidth()-ends) { return true; } else { return false; } } @Override public void mouseDragged(MouseEvent e) { // TODO Auto-generated method stub } }); addMouseListener(new CBListener(this,contentPane)); } @Override public void itemStateChanged(ItemEvent e) { // TODO Auto-generated method stub setVisible(e.getStateChange() == ItemEvent.SELECTED); } </code></pre> <p>}</p> <p>Listener Class ( for dispatching the mouse click)</p> <pre><code>import java.awt.Component; import java.awt.Container; import java.awt.Point; import java.awt.Robot; import java.awt.Toolkit; import java.awt.event.MouseEvent; import javax.swing.SwingUtilities; import javax.swing.event.MouseInputAdapter; class CBListener extends MouseInputAdapter { Toolkit toolkit; Robot rb; MyGlassPane glassPane; Container contentPane; public CBListener(MyGlassPane glassPane, Container contentPane) { toolkit = Toolkit.getDefaultToolkit(); this.glassPane = glassPane; this.contentPane = contentPane; } @Override public void mouseClicked(MouseEvent e) { redispatchMouseEvent(e, false); } // A basic implementation of redispatching events. private void redispatchMouseEvent(MouseEvent e, boolean repaint) { Point glassPanePoint = e.getPoint(); Container container = contentPane; Point containerPoint = SwingUtilities.convertPoint(glassPane, glassPanePoint, contentPane); if (containerPoint.y &lt; 0) { // we're not in the content pane } else { // The mouse event is probably over the content pane. // Find out exactly which component it's over. Component component = SwingUtilities.getDeepestComponentAt( container, containerPoint.x, containerPoint.y); if ((component != null) &amp;&amp; (component.equals(contentPane))) { System.out.println("contentPane"); // Forward events over the check box. Point componentPoint = SwingUtilities.convertPoint(glassPane, glassPanePoint, component); component.dispatchEvent(new MouseEvent(component, e.getID(), e .getWhen(), e.getModifiers(), componentPoint.x, componentPoint.y, e.getClickCount(), e .isPopupTrigger())); } } // Update the glass pane if requested. if (repaint) { glassPane.setPoint(glassPanePoint); glassPane.repaint(); } } </code></pre> <p>}</p>
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    1. COWe will have a better chance of helping you if you post the code you have written thus far.
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      1. USJason Braucht
    2. COWhen you say that you are "redirecting mouseClick", do you mean [redispatching the event as described here](http://docs.oracle.com/javase/tutorial/uiswing/components/rootpane.html#glasspane)?
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      1. PODrawing on JPanel behind GlassPane when clicking on GlassPane
      1. USRussell Zahniser
    3. CO@RussellZahniser yes that is what I meant. And I will post the code soon. Deciding what to edit out.
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