styledtext的SWT问题

Question

我正在使用SWT创建一个应用程序的菜单。

在类"B“中，方法createContents()负责创建表单的内容：

protected void createContents() {
    shell = new Shell();
    shell.setSize(500, 315);
    shell.setText("SWT Application");

    Label lblNewLabel = new Label(shell, SWT.NONE);
    lblNewLabel.setFont(SWTResourceManager.getFont("Segoe UI", 14, SWT.NORMAL));
    lblNewLabel.setBounds(188, 0, 108, 25);

    Button btnLogs = new Button(shell, SWT.NONE);
    btnLogs.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            Window3 window = new Window3();
            window.open();
        }
    });
    btnLogs.setBounds(386, 242, 75, 25);

    StyledText styledText = new StyledText(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL | SWT.MULTI);
    styledText.setBounds(10, 64, 357, 203);

    Label lblRealTimeLogs = new Label(shell, SWT.NONE);
    lblRealTimeLogs.setBounds(10, 35, 108, 15);

    Button btnFilters = new Button(shell, SWT.NONE);
    btnFilters.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
                Window2 window = new Window2();
                window.open();

        }
    });
    btnFilters.setBounds(386, 204, 75, 25);
    btnFilters.setText("FILTRES");

    Label lblConfiguration = new Label(shell, SWT.NONE);
    lblConfiguration.setFont(SWTResourceManager.getFont("Segoe UI", 9, SWT.BOLD));
    lblConfiguration.setText("Configuraci\u00F3");
    lblConfiguration.setBounds(386, 128, 88, 15);

    Button btnNewButton = new Button(shell, SWT.NONE);
    btnNewButton.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            Window4 window = new Window4();
            window.open();
        }
    });
    btnNewButton.setBounds(386, 165, 75, 25);


}   

然后我执行应用程序，显示"B“类中的表单。问题是我需要向来自另一个类的styledtext添加新的文本行。我需要做的是，在类"A“中，它检查文件的内容，如果内容发生了更改，它会在createContents()方法内的类"B”中创建的样式文本中添加新的行。这看起来很简单，但我无法引用类"B“中创建的样式文本从类"A”中添加这些新行……

对不起，如果它不是很清楚，我的英语不是很好…

任何帮助都将不胜感激。谢谢。

Answer 1

好了，我已经整理了一个简单的例子，应该可以向你展示如何做到这一点。它基本上创建了两个类，A和B，其中A包含一个从B修改而来的Text

public static void main(final String[] args)
{
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("StackOverflow");
    shell.setLayout(new GridLayout(1, false));

    /* Create your gui class */
    A.getInstance(shell);

    shell.pack();
    shell.open();

    /* Wait one second, then simulate generation of other class that calls gui class */
    Display.getDefault().timerExec(1000, new Runnable()
    {
        @Override
        public void run()
        {
            new B();
        }
    });

    while (!shell.isDisposed())
    {
        if (!display.readAndDispatch())
        {
            display.sleep();
        }
    }
    display.dispose();
}

private static class A
{
    private static A    INSTANCE;

    /* This is the field of A we want to modify */
    private Text        text;

    public static A getInstance(Shell shell)
    {
        if (INSTANCE == null && shell != null)
            INSTANCE = new A(shell);

        return INSTANCE;
    }

    private A(Shell shell)
    {
        text = new Text(shell, SWT.BORDER);
    }

    /* This is the method that allows editing the field of A from the outside */
    public void setText(String text)
    {
        if (this.text != null)
            this.text.setText(text);
    }
}

private static class B
{
    public B()
    {
        /* Set the text within A */
        A.getInstance(null).setText("Hello");
    }
}

或者，您可以让Text static忘记实例内容。