是否可以将事件从实例类传递给父类?
我有一个JFrame,其容器有两个JPanel。上面板包含另一个较小的JPanel,并且我已成功设置MouseListener以在单击小面板时执行命令。我想在单击小面板时在底部面板上显示文本。问题是事件处理是在上面板类中完成的,它不能访问JFrame上其他面板的实例。
以下是主窗口代码:
public CalendarWindow() {
// Set global variables
size = new Dimension(600,600);
setMinimumSize(size);
// Set default window layout and behaviour
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
Container c = getContentPane();
// Create panels and components
eventPanel = new EventPanel(new Dimension(size.width - 30, size.height/3));
CalendarPanel calendarPanel = new CalendarPanel(new Dimension(size.width - 30, size.height*2/3));
// Add components and panels to content pane
c.add(eventPanel, BorderLayout.SOUTH);
c.add(calendarPanel, BorderLayout.NORTH);
}
这是calendarPanel中的事件处理:
boxes[i][j].addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if(selectedBox != null)
selectedBox.unselect();
selectedBox = (DateBox)e.getSource();
selectedBox.getParent().getParent().dispatchEvent(e);
if(SwingUtilities.isRightMouseButton(e)) {
rightClickMenu menu = new rightClickMenu();
menu.show(e.getComponent(), e.getX(), e.getY());
menu.newEvent.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
selectedBox.addCalendarEvent(new CalendarEvent("Kaupa mjólk", 14, 15));
}
});
}
}
});
box变量是一种扩展JPanel的类型。如何使CalendarWindow在上面板中检测到鼠标单击?
答案 0 :(得分:2)
在父类中创建一个更改文本的方法,
并将父类传递给eventPanel
(添加参数,例如。 public eventPanel(CalendarWindow cw),
然后传递它, new eventPanel(this)),
然后在 eventPanel ( cw.themethod())中调用父方法