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POUpdating an image contained in a JLabel - problems
 

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  1. POUpdating an image contained in a JLabel - problems
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    <p>The part of the application that I am currently having trouble getting to work is being able to scroll through and display a list of images, one at a time. I'm getting a directory from the user, spooling through all of the files in that directory, and then loading an array of just the jpegs and pngs. Next, I want to update a JLabel with the first image, and provide previous and next buttons to scroll through and display each image in turn. When I try to display the second image, it doesn't get updated... Here's what I've got so far:</p> <pre class="lang-java prettyprint-override"><code>public class CreateGallery { private JLabel swingImage; </code></pre> <p>The method that I'm using to update the image:</p> <pre class="lang-java prettyprint-override"><code>protected void updateImage(String name) { BufferedImage image = null; Image scaledImage = null; JLabel tempImage; try { image = ImageIO.read(new File(name)); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } // getScaledImage returns an Image that's been resized proportionally to my thumbnail constraints scaledImage = getScaledImage(image, THUMB_SIZE_X, THUMB_SIZE_Y); tempImage = new JLabel(new ImageIcon(scaledImage)); swingImage = tempImage; } </code></pre> <p>Then in my createAndShowGUI method that puts the swingImage on...</p> <pre class="lang-java prettyprint-override"><code>private void createAndShowGUI() { //Create and set up the window. final JFrame frame = new JFrame(); // Miscellaneous code in here - removed for brevity // Create the Image Thumbnail swingImage and start up with a default image swingImage = new JLabel(); String rootPath = new java.io.File("").getAbsolutePath(); updateImage(rootPath + "/images/default.jpg"); // Miscellaneous code in here - removed for brevity rightPane.add(swingImage, BorderLayout.PAGE_START); frame.add(rightPane, BorderLayout.LINE_END); </code></pre> <pre class="lang-java prettyprint-override"><code>public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { UIManager.put("swing.boldMetal", Boolean.FALSE); new CreateGalleryXML().createAndShowGUI(); } }); } </code></pre> <p>If you've gotten this far, the first image is my default.jpg, and once I get the directory and identify the first image in that directory, that's where it fails when I try to update the swingImage. Now, I've tried to swingImage.setVisible() and swingImage.revalidate() to try to force it to reload. I'm guessing it's my tempImage = new JLabel that's the root cause. But I'm not sure how to convert my BufferedImage or Image to a JLabel in order to just update swingImage.</p>
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    1. COI had added a bit of information regarding why your `setVisible()/revalidate()` calls never worked in this situation. Hopefully that will put some light on this whole thingy a bit more, as to why you getting this unexpected behaviour :-)
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    2. COI had tried different combinations of setVisible(false) before than setting it back to true after the swingImage = tempImage; and also tried using .revalidate() before and after the setVisible(true). But I am beginning to believe it's the new JLabel(new ImageIcon(scaledImage) that's causing the problem... Still looking at it and trying to figure it out....
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