我有一個程序,需要一定的時間創建PDF文件 我想展現給用戶的JProgressBar不顯示(無螺紋)
進步,當我做完了PDF文件我嘗試調用進度更新其狀態:
ProgressDialog progress = new ProgressDialog(instance, numberOfInvoices);
progress.setVisible(true);
progress.setAlwaysOnTop(true);
for(int i = 0 ; i<numOfPdfs ; i++){
progress.change(i + 1);
}
的progressdialog看起來是這樣的:
public class ProgressDialog extends JDialog {
private JProgressBar progressBar;
public ProgressDialog(Window parent, int aantal) {
super(parent);
this.setPreferredSize(new Dimension(300, 150));
progressBar = new JProgressBar(0, aantal);
progressBar.setValue(0);
progressBar.setSize(new Dimension(280, 130));
this.add(progressBar, BorderLayout.CENTER);
this.pack();
this.setLocationRelativeTo(parent);
}
public void change(int aantal) {
if (aantal < progressBar.getMaximum() && aantal >= 0) {
progressBar.setValue(aantal);
}
}
}
我得到的是一個空的窗口(白色)
我環顧這個論壇,但胎面解決方案似乎太複雜
計算2個pdf文件之間我應該能夠更新gui,對不對?
確定科林
我想這:(完整的類)
public class ProgressDialog extends JDialog {
private JProgressBar progressBar;
private String message;
private static int number;
public ProgressDialog(Window parent, int max, String message) {
super(parent);
this.message = message;
this.setPreferredSize(new Dimension(300, 150));
progressBar = new JProgressBar(0, max);
progressBar.setValue(0);
progressBar.setSize(new Dimension(280, 130));
progressBar.setString(message + " 0/" + progressBar.getMaximum());
progressBar.setStringPainted(true);
this.add(progressBar, BorderLayout.CENTER);
this.pack();
this.setLocationRelativeTo(parent);
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
}
public void change(int number) {
ProgressDialog.number = number;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
int number = ProgressDialog.getAantal();
if (number < progressBar.getMaximum() && number >= 0) {
progressBar.getModel().setValue(number);
progressBar.setString(message + " " + progressBar.getValue() + "/" + progressBar.getMaximum());
System.out.println("progressbar update: " + number + "/" + progressBar.getMaximum());
} else {
setCursor(null);
System.out.println("progressbar terminated");
}
}
});
}
public static int getAantal(){
return number;
}
}
現在它仍顯示空窗 但是當所有的PDF文件已經準備好它確實表明與0%的進度完成 然後它關閉(像它應該這樣做)
任何想法,爲什麼它在過程中保持空白?