捕获关于、首选项和退出菜单项

Question

我正在使用当前版本的 SWT 构建我的应用程序，我想运行它在 Mac OS X (Yosemite) 下。
我现在的问题是，我无法捕获自动添加到我的应用程序中的 "About"、"Preferences" 和 "Quit" 菜单项的点击。
我已经搜索了很多并找到了以下 class 这对我来说似乎很有帮助 http://www.transparentech.com/files/CocoaUIEnhancer.java.

这是我初始化它的代码：

import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;

public class Test {
  private Display display;
  private Shell shell;

  public Test(Display display) {
    this.display = display;
    initUI();
  }

  public void open() {
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
  }

  private void initUI() {
    shell = new Shell(display);
    shell.setSize(808, 599);
    shell.setText("Test");

    AboutHandler aboutHandler = new AboutHandler();
    PreferencesHandler preferencesHandler = new PreferencesHandler();
    QuitHandler quitHandler = new QuitHandler();

    CocoaUIEnhancer uienhancer = new CocoaUIEnhancer("Test");
    uienhancer.hookApplicationMenu(display, quitHandler, aboutHandler, preferencesHandler);
  }

  private class AboutHandler implements Listener {
    public void handleEvent(Event e) {
    }
  }

  private class PreferencesHandler implements Listener {
    public void handleEvent(Event e) {
    }
  }

  private class QuitHandler implements Listener {
    public void handleEvent(Event e) {
    }
  }
}

我可以毫无错误地编译它，但是如果我启动程序，我将得到以下异常：

Exception in thread "main" java.lang.NoSuchMethodError: actionProc
  at org.eclipse.swt.internal.Callback.bind(Native Method)
  at org.eclipse.swt.internal.Callback.<init>(Unknown Source)
  at org.eclipse.swt.internal.Callback.<init>(Unknown Source)
  at org.eclipse.swt.internal.Callback.<init>(Unknown Source)
  at CocoaUIEnhancer.initialize(CocoaUIEnhancer.java:124)
  at CocoaUIEnhancer.hookApplicationMenu(CocoaUIEnhancer.java:92)
  at Test.initUI(Test.java:50)
  at Test.<init>(Test.java:18)

这可能是本地库中的一个错误，但我无法弄清楚！

Answer 1

看起来像这样 actionProc

int actionProc( int id, int sel, int arg0 )

in CocoaUIEnhancer 可能需要使用 long 而不是 int 来使参数与 64 位 SWT 一起工作。

Answer 2

您需要修改 CocoaUIEnhancer.java，使其与 this tutorial 中所述的纯 SWT 应用程序一起工作：

Modify the getProductName() method to return a String when no product is found (instead of null)

Wrap the code in hookWorkbenchListener() in a try-catch (IllegalStateException e) block

Wrap the code in modifyShells() in a try-catch (IllegalStateException e) block

Add some code to the actionProc(...) method, to bring up an About-Dialog and Preferences-Dialog (since we aren’t using commands):

    static long actionProc(long id, long sel, long arg0) throws Exception {
        // ...
        else if (sel == sel_preferencesMenuItemSelected_) {
            showPreferences();
        } else if (sel == sel_aboutMenuItemSelected_) {
            showAbout();
        }
        return 0;
    }

    private static void showAbout() {
        MessageDialog.openInformation(null, "About...",
                "Replace with a proper about text  / dialog");
    }

    private static void showPreferences() {
        System.out.println("Preferences...");
        PreferenceManager manager = new PreferenceManager();
        PreferenceDialog dialog = new PreferenceDialog(null, manager);
        dialog.open();
    }


    // ...

Finally, we add the following lines to our main() method:

public static final String APP_NAME = "MyApp";

public static void main(String[] args) {
    //in your case change the Test constructor 
    Display.setAppName(APP_NAME);
    Display display = Display.getDefault();

    //insert in initUI method call the earlysetup
    if (SWT.getPlatform().equals("cocoa")) {
        new CocoaUIEnhancer().earlyStartup();
    }

    Shell shell = new Shell(display);
    shell.setText(APP_NAME);
    ...
}

引用代码。

Answer 3

我根本没有使用 CocoaUIEnhancer，因为它也引起了问题。

所以这就是我最终在我的应用程序中所做的事情：

/**
 * Convenience method that takes care of special menu items (About, Preferences, Quit)
 *
 * @param name     The name of the menu item
 * @param parent   The parent {@link Menu}
 * @param listener The {@link Listener} to add to the item
 * @param id       The <code>SWT.ID_*</code> id
 */
private void addMenuItem(String name, Menu parent, Listener listener, int id)
{
    if (OSUtils.isMac())
    {
        Menu systemMenu = Display.getDefault().getSystemMenu();

        for (MenuItem systemItem : systemMenu.getItems())
        {
            if (systemItem.getID() == id)
            {
                systemItem.addListener(SWT.Selection, listener);
                return;
            }
        }
    }

    /* We get here if we're not running on a Mac, or if we're running on a Mac, but the menu item with the given id hasn't been found */
    MenuItem item = new MenuItem(parent, SWT.NONE);
    item.setText(name);
    item.addListener(SWT.Selection, listener);
}

分别用SWT.ID_PREFERENCES、SWT.ID_ABOUT、SWT.ID_QUIT调用即可。提交后备菜单项名称、后备 Menu 和您要添加到菜单项的实际 Listener。

例如：

addMenuItem("Quit", myMenu, new Listener()
{
    @Override
    public void handleEvent(Event event)
    {
        // Close database connection for example
    }
}, SWT.ID_QUIT);

Answer 4

Baz 的解决方案非常有效！如果您不想导入 OSUtils 只是为了测试您是否在 Mac 上，请改用：

System.getProperty("os.name").contentEquals("Mac OS X")

捕获关于、首选项和退出菜单项

Capture about, preferences and quit menu items

java

cocoa

swt

menu