如何选择Java SWT Composite？ [英] How do I make a Java SWT Composite selectable?

问题描述

我正在使用SWT库在eclipse中创建一个向导页面。到目前为止，我已经成功创建了页面但只有一个问题： - SWT复合没有被选中。我的向导页面包含一个scrollledComposite，其中包含多个网格方式的复合体。每个复合包含一个浏览器，就像一个示例模板。我想要的是当我选择一个包含浏览器的复合材料时，它应该被选中并且激活完成按钮。



现在，我怀疑的是，我如何制作包含它的复合材料可选择为复合的浏览器不包含selectionListener。或者更好的是，有没有办法让浏览器可选？



示例代码将不胜感激。



我是菜鸟，这是我的第一个问题所以请原谅我有任何错误。

I'm creating a wizard page in eclipse using SWT libraries. So far I have succeeded in creating the page but with only one issue:- SWT composite doesn't get selected. My wizard page contains a scrolledComposite containing multiple composites in a grid fashion. Each composite contains a browser just like a sample template. What i want is when i select a composite containing browser it should get selected and the finish button activated.

Now, my doubt is, how do i make the composite containing the browser selectable as a composite doesn't contain selectionListener. Or better still, is there a way to make a browser selectable?

Sample code would be appreciated.

I'm a noob and this is my first question so please forgive me for any mistakes in question.

推荐答案

经过一些研究，我发现有一个系统特定的错误，因为它不会到达FocusListener代码。请参阅此处的错误 https://bugs.eclipse.org/bugs/show_bug.cgi?id=84532



以下代码包含SWT浏览器可以获得焦点的解决方法。

After doing some research, I found there was a system specific bug due to which it wouldn't reach the FocusListener code. See bug here https://bugs.eclipse.org/bugs/show_bug.cgi?id=84532

The following code contains workaround through which a SWT Browser can get focus.

public static void main (String [] args) {

    Display.setAppName("Stackoverflow");
    final Display display = new Display();
    final Shell shell = new Shell(display);

    shell.setSize(500, 400);
    shell.setLayout(new FillLayout());

    final Composite composite = new Composite(shell, SWT.BORDER);
    composite.setLayout(new GridLayout());

    final Browser browser = new Browser(composite, SWT.NONE);
    browser.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

    final Button finish = new Button(shell, SWT.PUSH);
    finish.setText("Finish");
    finish.setEnabled(false);
    finish.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false));

    browser.setUrl("google.com");

    final FocusListener listener = new FocusListener() {

        @Override
        public void focusLost(FocusEvent e) {
            System.out.println("Focus lost");
        }

        @Override
        public void focusGained(FocusEvent e) {
            System.out.println("Focus gained");
            finish.setEnabled(true);
        }
    };

    /*
     * workaround for bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=84532
     */
    Listener deactivateListener = new Listener() {

        @Override
        public void handleEvent(Event event) {
            listener.focusLost(new FocusEvent(event));
        }
    };
    Listener activateListener = new Listener() {

        @Override
        public void handleEvent(Event event) {
            listener.focusGained(new FocusEvent(event));
        }
    };

    browser.addListener(SWT.Deactivate, deactivateListener);
    browser.addListener(SWT.Activate, activateListener);

    finish.addSelectionListener(new SelectionAdapter() {
        public void widgetSelected(SelectionEvent e){
            System.out.println("OK");
        }
    });

    shell.open();

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

}

现在浏览器确实获得了我的按钮被激活的焦点，但有没有办法将其显示为已选中？

Now the browser does get focus through which my button gets activated but is there any way to show it as selected?

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