Block Frame 實作 @ 西西部落格@痞客邦

最近實作了一個Frame，透過這個Frame可以將main thread block住。

如此一來，如果應用程式需要依序開啟幾個Frame而且需視前一個Frame的結果來決定後者Frame的樣式便可以派上用場。

舉個實用例來說

如果要設計一個登入Frame，登入成功後才show出主 Frame，這時就可以派上用場

code sample :

BlockFrame.java

public class BlockFrame extends JFrame
{

public final static int BLOCKER_BLOCK = -1;

public final static int BLOCKER_NONE = 1;

protected int blocker = BLOCKER_BLOCK;

public int getBlocker()
{
return blocker;
}

protected synchronized void disposeNonBlock()
{
this.dispose();

blocker = BLOCKER_NONE;

notify();
}

public synchronized void doBlock()
{
    while(this.getBlocker() == BLOCKER_BLOCK)
    {
      try
      {
        wait();
      }
      catch(InterruptedException e)
      {
        e.printStackTrace();
      }

}
}
}

Login.java

public class LoginFrame extends BlockFrame implements ActionListener
{
protected JButton mybutton = new JButton();
public LoginFrame
{
    // do someting here for GUI
    mybutton.addActionListener(this);
}

public void actionPerformed(ActionEvent e)
{
    // do someting here for login when actionPerformed

    // 關閉且解除 block狀態
    disposeNonBlock();
}
}

Main.java

public class Main
{
public static void main(String[] args) throws Exception
{
    try
    {
      LoginFrame frame = new LoginFrame();

      // this will block main thread
      frame.doBlock();

      // after block, do someting for main frame or otherelse

    }
    catch(Exception ex)
    {
      ex.printStackTrace();
    }
    new Main();
}
}