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我正在使用SwingWorker類來執行後臺任務。後臺線程完成作業後，會更新GUI的許多不同組件（這些位於done()方法中）。 doInBackground()方法發佈HeatMap類對象，而process()方法將其添加到JPanel組件。我已將MouseListener和MouseMotionListener添加到此Heatmap類對象。主要的GUI類中存在mouseMoved()方法。當移動鼠標時，應該在JLabel中顯示關於它的HeatMap上的鼠標的座標位置。SwingWorker爲什麼不將對象返回給EDT？
當我運行代碼時，HeatMap對象在JPanel中可見，但我認爲EDT無法訪問它。這是因爲，在一個快速檢查，我發現，在rawIntensityMapHeatMap對象不在SwingWorker的process()方法null，但它仍然是null在mouseMoved()方法，因爲我得到了NullPointerException。
的HeatMap對象在GUIMain類和SwingWorker類被聲明爲：
private HeatMap rawIntensityMap = null;
我沒有在rawIntensityMap對象發送到SwingWorker類的構造函數。我早些時候嘗試過，但沒有奏效。
下面是從SwingWorker類process()方法：
@Override
protected void process(List<HeatMap> chunks) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
imagePanel.add(rawIntensityMap, BorderLayout.CENTER);
coordinates.setBounds(31, 31, rawIntensityMap.getWidth() - 31, rawIntensityMap.getHeight() - 31);
}
});
}
這裏是mouseMoved()方法：
@Override
public void mouseMoved(MouseEvent e) {
System.out.println("I am in the mouseevent" + coordinates.toString());
System.out.println("Width of raw Intensity map: " + rawIntensityMap.getWidth());
if (e.getPoint().x >= 31 && e.getPoint().y >= 31 && e.getPoint().x <= rawIntensityMap.getWidth() - 31 && e.getPoint().y <= rawIntensityMap.getHeight() - 31) {
rawIntensityMap.removeAll();
rawIntensityMap.add(coordinates);
coordinates.setText("(x,y) = " + "(" + (e.getPoint().x - 31) + "," + (e.getPoint().y - 31) + ")");
if (peakPickedImage.isSelected()) {
preprocessedIntensityMap.add(coordinates);
coordinates.setText("(x,y) = " + "(" + (e.getPoint().x - 31) + "," + (e.getPoint().y - 31) + ")");
coordinates.revalidate();
coordinates.repaint();
}
coordinates.revalidate();
coordinates.repaint();
}
}
這是我的SwingWorker類的基本結構：
public class FileReadWorker extends SwingWorker<REXP, HeatMap> {
public FileReadWorker(GUIMain guiClassObject, File fileName, JTree rawSpectraTree, DefaultTreeModel model, DefaultMutableTreeNode root, String currentPath, JTextField minMz, JTextField maxMz, JFreeChart spectrumPlot, ChartPanel chartPanel, JPanel chartContent, float minMzValue, float maxMzValue, Float globalMinMz, Float globalMaxMz, JLabel statusLabel, JPanel imagePanel, JLabel coordinates, JTabbedPane tabbedSpectralFiles, JScrollPane spectralFilesScrollPane, JPanel rawFilesPanel, JRadioButton rawImage, JRadioButton peakPickedImage, JMenuItem loadPeakListMenuItem, JButton loadPeaklistsButton, JMenuItem propertiesMenuItem, JButton propertiesButton) {
this.guiClassObject = guiClassObject;
this.fileName = fileName;
this.rawSpectraTree = rawSpectraTree;
this.currentPath = currentPath;
this.minMz = minMz;
this.maxMz = maxMz;
this.spectrumPlot = spectrumPlot;
this.chartPanel = chartPanel;
this.chartContent = chartContent;
this.minMzValue = minMzValue;
this.maxMzValue = maxMzValue;
this.GlobalMinMz = globalMinMz;
this.GlobalMaxMz = globalMaxMz;
this.statusLabel = statusLabel;
this.imagePanel = imagePanel;
this.coordinates = coordinates;
this.tabbedSpectralFiles = tabbedSpectralFiles;
this.spectralFilesScrollPane = spectralFilesScrollPane;
this.rawFilesPanel = rawFilesPanel;
this.rawImage = rawImage;
this.peakPickedImage = peakPickedImage;
this.loadPeakListMenuItem = loadPeakListMenuItem;
this.loadPeaklistsButton = loadPeaklistsButton;
this.propertiesMenuItem = propertiesMenuItem;
this.propertiesButton = propertiesButton;
this.model = model;
this.root = root;
}
@Override
protected REXP doInBackground() throws Exception {
// does some background tasks
// Works on the generating the HeatMap
try {
rawIntensityMap = gim.generateIntensityMap(rawSpectrumObjects, currentPath, minMzValue, maxMzValue, Gradient.GRADIENT_Rainbow, "RAW");
publish(rawIntensityMap);
} catch (RserveException e) {
e.printStackTrace();
} catch (REXPMismatchException e) {
e.printStackTrace();
}
// returns a REXP object
return rawSpectrumObjects;
}
@Override
public void done() {
// Updates different components of the GUI
rawIntensityMap.addMouseListener(guiClassObject);
rawIntensityMap.addMouseMotionListener(guiClassObject);
}
}
}
有人可以指向呃在這裏？
更多的代碼：
這是我GUIMain所在班級HeatMap rawIntensityMap聲明。另外，我粘貼了實際使用該對象的部分代碼（未粘貼所有方法）。
public class GUIMain extends JFrame implements ActionListener, ItemListener, MouseListener, MouseMotionListener, ChangeListener {
volatile HeatMap rawIntensityMap;
private JPanel imagePanel; // container for the HeatMap
/**
* Constructor to setup the GUI
*/
public GUIMain(String title) {
super(title);
setLayout(new BorderLayout());
//getSize();
setSize(getSize());
imagePanel = new JPanel(new BorderLayout());
g.gridx = 0;
g.gridy = 1;
g.gridwidth = 2;
g.weightx = 1.0; // fill the rest of the space
g.weighty = 1.0;
g.fill = GridBagConstraints.BOTH;
imagePanel.setBorder(BorderFactory.createEtchedBorder());
//imagePanel.addMouseListener(this);
imageDisplay.add(imagePanel, g);
// ImageDisplay.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
imageDisplay.setBorder(
BorderFactory.createCompoundBorder(
BorderFactory.createTitledBorder("View 2-D ion intensity map"),
BorderFactory.createEmptyBorder(5, 5, 5, 5)));
}
public void actionPerformed(ActionEvent e) {
//Handle open *.img imaging file button and menu item action
if ((e.getSource() == OpenImagingFileButton) || (e.getSource() == loadRawSpectraMenuItem)) {
int returnVal = fcImg.showOpenDialog(GUIMain.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
file = fcImg.getSelectedFile();
root = new DefaultMutableTreeNode(file);
rawSpectraTree = new JTree(root);
model = (DefaultTreeModel) rawSpectraTree.getModel();
//Passing this HeatMap to the SwingWorker class
FileReadWorker frw = new FileReadWorker(this, file, rawSpectraTree, rawIntensityMap, model, root, currentPath, minMz, maxMz, spectrumPlot, chartPanel, chartContent, minMzValue, maxMzValue, GlobalMinMz, GlobalMaxMz, statusLabel, imagePanel, coordinates, tabbedSpectralFiles, spectralFilesScrollPane, rawFilesPanel, rawImage, peakPickedImage, loadPeakListMenuItem, loadPeaklistsButton, propertiesMenuItem, propertiesButton);
frw.execute();
}
// Method when a different HeatMap color gradient is selected
@Override
public void itemStateChanged(ItemEvent e) {
colorNumber = (Integer) e.getItem();
if (e.getStateChange() == ItemEvent.SELECTED) {
rawIntensityMap.updateGradient(gradients[colorNumber]);
if (peakPickedImage.isEnabled()) {
preprocessedIntensityMap.updateGradient(gradients[colorNumber]);
}
}
}
// Mouse moved event
@Override
public void mouseMoved(MouseEvent e) {
if(rawIntensityMap == null)
System.out.println("TRUE**");
else
System.out.println("FALSE**");
System.out.println("I am in the mouseevent" + coordinates.toString());
if (e.getPoint().x >= 31 && e.getPoint().y >= 31 && e.getPoint().x <= rawIntensityMap.getWidth() - 31 && e.getPoint().y <= rawIntensityMap.getHeight() - 31) {
rawIntensityMap.removeAll();
rawIntensityMap.add(coordinates);
coordinates.setText("(x,y) = " + "(" + (e.getPoint().x - 31) + "," + (e.getPoint().y - 31) + ")");
if (peakPickedImage.isSelected()) {
preprocessedIntensityMap.add(coordinates);
coordinates.setText("(x,y) = " + "(" + (e.getPoint().x - 31) + "," + (e.getPoint().y - 31) + ")");
coordinates.revalidate();
coordinates.repaint();
}
coordinates.revalidate();
coordinates.repaint();
}
}
}
SwingWorker類的代碼已經粘貼在上面。
完整的示例見[這裏]（http://stackoverflow.com/a/25043676/230513）和[這裏]（http://stackoverflow.com/a/16880714/230513）。 – trashgod