//顯示在屏幕上的當(dāng)前日期 private final Calendar today = Calendar.getInstance();
下面便開(kāi)始處理點(diǎn)擊不同天的事件。我采用比較輕易實(shí)現(xiàn)的外觀即將天天都以一個(gè)標(biāo)簽是日期的按紐顯示在屏幕上，我定義了一個(gè)簡(jiǎn)單的監(jiān)聽(tīng)對(duì)象并加載到每個(gè)按紐中。由監(jiān)聽(tīng)對(duì)象獲取按紐標(biāo)簽值，由標(biāo)簽值可以得到日期與日歷的位置，然后它將從日歷中獲取日期對(duì)象并且將日期字符串發(fā)送給監(jiān)聽(tīng)器（通過(guò)調(diào)用fire_ActionEvent()的方式）。 //一個(gè)監(jiān)聽(tīng)器適合所有calendar事件 private final Button_handler day_listener = new Button_handler();
private class Button_handler implements ActionListener { public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("D")) { String text = ((JButton) e.getSource()).getText();
if(text.length() > 0) // <=0 means click on blank square. Ignore. { calendar.set ( calendar.get(Calendar.YEAR), // Reset the calendar calendar.get(Calendar.MONTH), // to be the chosen Integer.parseInt(text) // date. ); selected = calendar.getTime(); fire_ActionEvent( SELECT_ACTION, selected.toString() ); } } } }
// The buttons that comprise the calendar are in a single // dimensioned array that was added to a 6x7 grid layout in // order. Because of the linear structure, it's easy to // lay out the calendar just by changing the labels on // the buttons. Here's the algorithm used below: // // 1) Find out the offset to the first day of the month. // 2) Clear everything up to that offset. // 3) Add the days of the month. // 4) Clear everything else.
int month = calendar.get(Calendar.MONTH); int year = calendar.get(Calendar.YEAR);
fire_ActionEvent( CHANGE_ACTION, months[month] + " " + year );
calendar.set( year, month, 1 ); // First day of the current month.
int first_day_offset = calendar.get(Calendar.DAY_OF_WEEK); /* 1 */
// Note that we break out of the previous loop with i positioned // at the last day we added, thus the following ++ *must* be a // preincrement because we want to start clearing at the cell // a
