Question

我正在尝试在eclipse中开发Java SWT应用程序。我需要在单击按钮时使用SWT中的DateTime日历填充文本框。我尝试了以下代码，但无法看到日历，尽管它已创建。任何帮助，将不胜感激。感谢

public void createPartControl(final Composite parent) {
        Button button;
        Label label;
        final Display dev = parent.getDisplay();        
        Image image = new Image(dev,"C:\\Users\\rm186021\\Desktop\\Calendar.gif");
        GridLayout gridLayout = new GridLayout();
        gridLayout.numColumns = 3;
        parent.setLayout(gridLayout);       
        label = new Label(parent, SWT.NULL);
        label.setText("Start date ");
 final Text start = new Text(parent, SWT.SINGLE | SWT.BORDER);
 Button calButton = new Button(parent, SWT.PUSH);
        calButton.setImage(image);
        calButton.addSelectionListener(new SelectionAdapter() {
              @Override     
              public void widgetSelected(SelectionEvent e) {
                final Display display = new Display();
               final Shell shell2 = new Shell(display);
               shell2.addListener(SWT.CALENDAR, new Listener() {
                 public void handleEvent(Event event) {
                 final DateTime calendar = new DateTime(shell2,SWT.CALENDAR | SWT.POP_UP);
                 calendar.addSelectionListener (new SelectionAdapter () {
                    public void widgetSelected (SelectionEvent e) {
                      start.setData(" " + calendar.getYear() + "-" + (calendar.getMonth() + 1) + "-" + calendar.getDay());
                      System.out.println(start.getData());
                      //calendar.dispose();                   
                    }
                }); 
                }
                }); 
             }
        });

Answer 1

DateTime真的不应该用这样的代码创建:)试试这个：

calButton.addSelectionListener(new SelectionAdapter() {
    @Override
    public void widgetSelected(SelectionEvent e) {
        final Shell shell2 = new Shell(dev.getActiveShell()); 
        // new Display() won't work on many platforms if one already exists
        final DateTime calendar = new DateTime(shell2, SWT.CALENDAR); 
        // no need to add a listener to shell2, and POP_UP doesn't work for DateTime
        calendar.addSelectionListener(...);
        shell2.open();
        // Edward Thomson noticed it wasn't called, I missed it
    }
};

Answer 2

您正在创建Shell，但从未打开它。尝试拨打shell2.open()。
您正在为SWT.CALENDAR添加Shell听众。这不会做你想做的事。或者其他任何事情，因为Shell不会触发SWT.CALENDAR事件。相反，您只需将DateTime添加到容器中，并将选择侦听器连接到Calendar。
SWT.POP_UP不适合Calendar。

我建议继承Dialog（例如，将其称为CalendarDialog），在其上设置FillLayout，向其添加Calendar并以此方式连接侦听器。然后拨打CalendarDialog.open()。

如何在Java SWT中单击按钮时弹出日历？

2 个答案: