如何重新绘制SWT窗口？

Question

是否可以选择重新绘制SWT中的所有窗口？我有900个组合框的shell，我必须在循环（100x）中重新绘制此窗口的所有内容，并计算它是多少微秒。

如何创建循环以及重绘的计数时间并不重要。

我尝试了 redraw（），setRedraw（true），布局以及来自少数论坛的类似建议，但我认为它不起作用。

当我使用 window.invalidate（）时，我需要像在Swing中一样的功能;             window.validate（）;             window.repaint（）;

public class SwtCombobox {

private static final int numberOFTestingLoops = 100;

protected Shell shell;
private Combo[] comboboxes;

private List<Long> resultOfAnalysisRepaint = new ArrayList<Long>();
private List<Double> resultOfAnalysisMemory = new ArrayList<Double>();

private int counterOfAnalysis = 0;

public static void main(String[] args) {
    try {
        SwtCombobox window = new SwtCombobox();
        window.open(window);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public void open(SwtCombobox window) {
    Display display = Display.getDefault();
    createContents();
    shell.open();
    shell.layout();
    shell.addPaintListener(new MyListener(window));
    while (!shell.isDisposed()) {

        if (counterOfAnalysis < numberOFTestingLoops) {
            counterOfAnalysis++;

            shell.redraw();

        } else if (counterOfAnalysis == numberOFTestingLoops) {
            createOutputFile();
            shell.setRedraw(false);

            MessageBox messageBox = new MessageBox(shell,
                    SWT.ICON_INFORMATION);
            messageBox.setMessage("Analysis file created.");
            messageBox.open();

            System.exit(0);
        }

        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
}

protected void createContents() {

    shell = new Shell();
    shell.setSize(1550, 670);

    comboboxes = new Combo[900];

    int counter = 0;

    for (int i = 0; i < 30; i++) {
        for (int y = 0; y < 30; y++) {

            counter++;
            String options[] = { Integer.toString(counter), "test1",
                    "test2" };

            comboboxes[i] = new Combo(shell, SWT.BORDER);
            comboboxes[i].setItems(options);
            comboboxes[i].select(0);
            comboboxes[i].setBounds(y * 51, i * 21, 51, 21);
        }
    }
}

public void repaint() {

    long solStart = System.currentTimeMillis();

    long solTime = System.currentTimeMillis() - solStart;
    resultOfAnalysisRepaint.add(solTime);
    double currentMemory = ((double) ((double) (Runtime.getRuntime().totalMemory() / 1024) / 1024)) - ((double) ((double) (Runtime.getRuntime().freeMemory() / 1024) / 1024)); 
    resultOfAnalysisMemory.add(currentMemory);
}

private void createOutputFile() {
    String currentDir = System.getProperty("user.dir");
    generateCsvFile(currentDir + "\\outputSwtCombobox.csv",
            resultOfAnalysisRepaint, resultOfAnalysisMemory);
}

private static void generateCsvFile(String sFileName,
        List<Long> resultsRepaint, List<Double> resultsMemory) {
    try {
        FileWriter writer = new FileWriter(sFileName);
        Long averageRepaint = 0L;
        Double averageMemory = 0.0;

        writer.append("RepaintTime");
        writer.append(';');
        writer.append("MemoryUsage");
        writer.append('\n');

        for (int i = 0; i < resultsRepaint.size(); i++) {
            writer.append(resultsRepaint.get(i).toString());
            writer.append(';');

            writer.append(resultsMemory.get(i).toString());
            writer.append('\n');

            averageRepaint = averageRepaint + resultsRepaint.get(i);
            averageMemory = averageMemory + resultsMemory.get(i);
        }

        writer.append('\n');
        writer.append("Average (microseconds):");
        writer.append(';');
        writer.append("Average (MB):");
        writer.append('\n');
        writer.append(String
                .valueOf((averageRepaint / numberOFTestingLoops)));
        writer.append(';');
        writer.append(String
                .valueOf((averageMemory / numberOFTestingLoops)));

        writer.flush();
        writer.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

}

class MyListener实现了PaintListener {

private SwtCombobox swtCombobox;

public MyListener(SwtCombobox swtCombobox) {
    super();
    this.swtCombobox = swtCombobox;
}

public void paintControl(PaintEvent e) {
    swtCombobox.repaint();
}

}