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POMinor Refactoring in Java Swing application causes huge slowdown
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  1. POMinor Refactoring in Java Swing application causes huge slowdown
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    copied!<p>I've been tasked with doing refactoring to a Java Swing application we have here that's pretty crufty. My job is to clean up the code and make it more dynamic as we're going to start using it with a second project and it needs to be able to adjust appropriately. There is a small portion of one window that contains</p> <ul> <li>A button</li> <li>A JFormattedTextField that is used to select dates.</li> <li>A 3X4 table of JLabels that display data.</li> </ul> <p>The person who originally wrote this simply used a GridBagLayout JPanel and then hardcoded everything, including the table's header and row label's and left empty JLabel's in the dynamic data position. When the dynamic information is received <code>setText</code> is called with the text data. Part of my refactoring will cause the entire table to be dynamic in dimension as well as content so I decided to make the table a sub-panel with a GridLayout and dynamically set the contents and dimensions with this piece of code:</p> <pre> public void updateInfoPanel(ArrayList rows) { System.out.println("Updating Info Panel!"); //genericInfo is the new sub panel in question. genericInfo.removeAll(); GridLayout layout = new GridLayout(); layout.setColumns(rows.get(0).length); layout.setRows(rows.size()); genericInfo.setLayout(layout); for(String[] row : rows) { for(String element : row) { genericInfo.add(new Label(element)); } } } </pre> <p>I have verified that this is only ever getting called one time per window creation but the entire window is now incredibly sluggish. It can take >5 seconds to respond to clicks in other parts of the frame that used to respond in fractions of a second. Does anyone know what would cause this? Is there something about GridLayouts that I don't understand? </p>
 

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