java - 保持 TrayDialog 打开并提交数据

Question

我有一个对话框，它扩展了TrayDialog来从用户收集一些数据。我想将收集到的值传递给另一个类而不关闭对话框。如果我重写 okPressed() 方法，数据将被传回，但窗口将关闭。

public class MyDialog extends TrayDialog {
    public MyDialog(final Shell shell, final MyData mydata) {
        super(shell);
        this.shell = shell;
        this.mydata = mydata;
    }

    @Override
    protected void okPressed() {
        if (!validateData()) {
            return;
        }
        super.okPressed();
    }

    //rest of the code for text box, buttons in the dialog
}

final MyDialog myDialog = new MyDialog(new Shell(), this.mydata);
if (myDialog.open() == Window.CANCEL) {
    return null;
}
//here get the data that user has entered in the dialog after they press ok

Answer 1

如果不调用super.okPressed()对话框将不会关闭。 Source :

protected void okPressed() {
    setReturnCode(OK);
    close();
}

为了将数据传回 okPressed 操作，我建议向 MyDialog 提供回调。像这样的事情:

public interface MyCallback {
    void okPressed(MyData data);
}

public class MyDialog extends TrayDialog {
public MyDialog(final Shell shell, final MyData mydata, MyCallback callback) {
    super(shell);
    this.shell = shell;
    this.mydata = mydata;
    this.callback = callback;
}

@Override
protected void okPressed() {
    if (!validateData()) {
        return;
    } else {
        callback.onPressed(data);
    }
    //super.okPressed();
}

MyCallback callback = new MyCallback() {

    void okPressed(MyData data) {
        // handle data
    }
}
 final MyDialog myDialog = new MyDialog(new Shell(), this.mydata, callback);
    if (myDialog.open() == Window.CANCEL) {
        return null;
    }

在这种情况下，您需要在某个时候手动关闭对话框。另外，如果您使用 setBlockOnOpen(false);，Dialog 不会阻塞执行线程。