[macOS] Delay when closing dialog

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难度
4/5
预计耗时
3-5 天
新手友好度
30/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
java, macos
领域
desktop, desktop-dev

调研方向

The payload contains only the reproduction snippet, with no source files named. Start by running the snippet on macOS, then find where Display.readAndDispatch() and the Cocoa event loop handle closing a dialog. The bug is confirmed when the dialog stays open during Thread.sleep(4000), and the fix is done when it closes immediately as it does on Windows and Linux.

由索引模型根据 Issue 内容生成。

描述

  • All versions of SWT and JFace
  • macOS 15, 26 or 27
  • Java 25 Temurin
  • This problem has always existed

There can be a delay when closing a Dialog (JFace or SWT) on Mac if it's followed by a long running task. This delay does not occur on Windows or Linux where the dialog is closed immediately.

Run the Snippet. On Windows or Linux the dialog or message box closes immediately. On Mac the dialog only closes when the long running task completes.

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.MessageBox;
import org.eclipse.swt.widgets.Shell;

public class DialogCloseDelay {

    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setText("Dialog Test");
        shell.setLayout(new FillLayout());
        shell.setSize(450, 250);
        shell.open();

        // Same behavior on JFace Dialog or SWT Dialog (MessageBox)
        boolean useDialog = true;
        if(useDialog) {
            Dialog dialog = new Dialog(shell) {};
            dialog.open();
        }
        else {
            MessageBox box = new MessageBox(shell);
            box.open();
        }
        
        // Uncomment this to unfreeze it
        // shell.getDisplay().readAndDispatch();

        // Long running task
        try {
            Thread.sleep(4000);
        }
        catch(InterruptedException e) {}

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

If the following line in the Snippet is uncommented there is no freeze:

shell.getDisplay().readAndDispatch();
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