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POJTextArea in JScrollPane, view coordinate translation
 

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  1. POJTextArea in JScrollPane, view coordinate translation
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    <p>I'm trying to translate between view and viewport coordinates. But the JViewport/JScrollpane doesn't seem to work as documented. <code>JViewport.toViewCoordinates()</code> thinks the view is always at the top left of the component, even though that's clearly not the case.</p> <pre><code>String text = "blahblahblah\nblahblah\nblah"; JFrame frame = new JFrame("title"); JTextArea textArea = new JTextArea(text, 1, 30); // shows only one line frame.add(new JScrollPane(textArea)); frame.pack(); frame.setVisible(true); textArea.setCaretPosition(text.length()); // now showing the last line JViewport viewport = ((JViewport)textArea.getParent()); viewport.getViewRect(); // returns java.awt.Rectangle[x=0,y=0,width=330,height=16] viewport.getViewPosition(); // returns java.awt.Point[x=0,y=0] viewport.toViewCoordinates(new Point(0,0)); // returns java.awt.Point[x=0,y=0] </code></pre> <p>The above is contrived example. My real <code>JTextArea</code> is larger than one line. I don't need JTextArea "model" coordinate (the offset in the text). I need genuine 2d coordinates.</p> <p>The view position shouldn't be (0,0), as the first visible character in the viewport is actually in the 3rd line of the JTextArea.</p> <p>Any other suggestions on how I can translate between view and component coordinates when using JScrollPane?</p> <p>--- added ---</p> <p>This also fails.</p> <pre><code>SwingUtilities.convertPoint(viewport,0,0, textArea); (java.awt.Point) java.awt.Point[x=0,y=0] </code></pre> <p>--- added ---</p> <p>Here is the final working version, based on the answer I received. it shows <code>java.awt.Point[x=0,y=32]</code> which is what I expected.</p> <pre><code>@Test public void test() throws InterruptedException { String text = "blahblahblah\nblahblah\nblah"; JFrame frame = new JFrame("title"); JTextArea textArea = new JTextArea(text, 1, 30); frame.add(new JScrollPane(textArea)); frame.pack(); frame.setVisible(true); textArea.setCaretPosition(text.length()); final JViewport viewport = ((JViewport)textArea.getParent()); SwingUtilities.invokeLater(new Runnable() { @Override public void run() { System.out.println(viewport.getViewPosition()); } }); Thread.sleep(1000); } </code></pre>
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