foldertreepanel.java

一个用java写的mail.里面的代码值得我们去研究！学习。

                            ex.getMessage() );
      }
    } else {
      // UNDONE - notify use with JOptionPane...
    }
  }

  private void
  createNewFolder() {
    TreePath path = tree_.getSelectionPath();
    if ( path == null ) {
      return;
    }

    Folder folder = null;
    DefaultMutableTreeNode root = null;

    Object obj = path.getLastPathComponent();
    if ( obj instanceof StoreTreeNode ) {
      StoreTreeNode node = (StoreTreeNode) obj;
      folder = node.getDefaultFolder();
      root = node;
    } else if ( obj instanceof FolderTreeNode ) {
      FolderTreeNode node = (FolderTreeNode) obj;
      folder = node.getFolder();
      root = node;
    }
    
    if ( folder != null ) {
      NewFolderDialog dlg =
        new NewFolderDialog( (Frame)getTopLevelAncestor(), folder.getFullName() );

      dlg.show();

      String xfolderName = dlg.folderName();
      if ( xfolderName != null && xfolderName.length() > 0 ) {
        try {
          MailUtilities.setStoreConnected( folder.getStore() );

          Folder newFolder = folder.getFolder( xfolderName );

          if ( newFolder.exists() ) {
            Object[] xargs = new Object[2];
            xargs[0] = xfolderName;
            xargs[1] = folder.getFullName();
            ComponentFactory.showDialog( ICEMail.getBundle(), "FolderTree.FolderExists",
                                         0, JOptionPane.ERROR_MESSAGE, xargs );
          } else {
            int flags = 0;

            if ( dlg.holdsFolders() )
              flags += Folder.HOLDS_FOLDERS;

            if ( dlg.holdsMessages() )
              flags += Folder.HOLDS_MESSAGES;

            boolean ok = newFolder.create( flags );
            
            if ( ok ) {
              FolderTreeNode newNode = new FolderTreeNode( newFolder );

              int ri;
              int indice = 0;
              int rsz = root.getChildCount();
              for ( ri = 1 ; ri < rsz ; ++ri ) {
                String name = null;
                TreeNode n = root.getChildAt( ri );

                if ( n instanceof FolderTreeNode ) {
                  name = ((FolderTreeNode) n).getFolder().getName();
                } else if  ( n instanceof StoreTreeNode ) {
                  name = ((StoreTreeNode) n).getName();
                }

                if ( name != null && name.compareTo( newFolder.getName() ) > 0 ) {
                  root.insert( newNode, ri );
                  indice = ri;
                  break;
                }
              }
              
              if ( ri >= rsz ) {
                indice = rsz;
                root.insert( newNode, rsz );
              }

              DefaultTreeModel model = (DefaultTreeModel)tree_.getModel();
              
              int[] indices = { indice };
              model.nodesWereInserted( root, indices );

              tree_.invalidate();
              tree_.validate();
            } else {
              Object[] xargs = new Object[1];
              xargs[0] = xfolderName;
              ComponentFactory.showDialog( ICEMail.getBundle(), "FolderTree.CreateFailed",
                                           0, JOptionPane.ERROR_MESSAGE, xargs );
            }
          }
        } catch ( MessagingException ex ) {
          Object[] xargs = new Object[1];
          xargs[0] = xfolderName;
          xargs[1] = ex.getMessage();
          ComponentFactory.showDialog( ICEMail.getBundle(), "FolderTree.StoreFailed",
                                       0, JOptionPane.ERROR_MESSAGE, xargs );
        }
      }
    }
  }

  private void
  openSelectedFolder() {
    FolderTreeNode node = getSelectedFolder();
    if ( node == null )
      return;

    Folder folder = node.getFolder();

    String msg = ICEMail.getBundle().getString( "FolderTree.Opening.text" );

    DialogRunner runner = new DialogRunner( new OpenFolderRunner( folder ),
                                            (Frame)getTopLevelAncestor(), msg, msg );
    runner.start();
  }

//............................................................

  private class IActionListener
    implements ActionListener
  {
    /**
     * Invoked when an action occurs.
     * <p>
     * Implementation of java.awt.event.ActionListener.actionPerformed()
     *
     * @param event the action event that occured
     */
    public void
    actionPerformed( ActionEvent event ) {
      String command = event.getActionCommand();

      if ( command.equals( "OPEN" ) ) {
        openSelectedNode();
      } else if ( command.equals( "PROPS" ) ) {
        // UNDONE
      } else if ( command.equals( "CREATEFOLDER" ) ) {
        createNewFolder();
      } else if ( command.equals( "ADDSTORE" ) ) {
        addNewStore();
      } else if ( command.equals( "RELOAD" ) ) {
        loadRootStores();
      } else if ( command.equals( "EXPAND" ) ) {
        TreePath path = tree_.getSelectionPath();
        if ( path != null ) {
          tree_.expandPath( path );
        }
      } else if ( command.equals( "COLLAPSE" ) ) {
        TreePath path = tree_.getSelectionPath();
        if ( path != null ) {
          tree_.collapsePath( path );
        }
      } else if ( command.equals( "MOVEMSG" ) ) {
        FolderTreeNode node = getSelectedFolder();
        if ( node != null ) {
          messagePanel_.copySelectedMessages( node.getFolder(), true );
        }
      } else if ( command.equals( "COPYMSG" ) ) {
        FolderTreeNode node = getSelectedFolder();
        if ( node != null ) {
          messagePanel_.copySelectedMessages( node.getFolder(), false );
        }
      }
    }
  }

//............................................................

  private class ITreeSelectionListener
    implements TreeSelectionListener
  {
    public void
    valueChanged( TreeSelectionEvent event ) {
    }
  }

//............................................................

  private class IMouseAdapter
    extends MouseAdapter
  {
    private boolean    isPopupClick = false;

    public
    IMouseAdapter() {
      super();
    }

    public void
    mousePressed( MouseEvent event ) {
      isPopupClick = false;

      if ( event.isPopupTrigger() ) {
        int selRow = tree_.getRowForLocation( event.getX(), event.getY() );

        if ( selRow != -1 ) {
          tree_.setSelectionRow( selRow );
        }

        isPopupClick = true;

        DefaultMutableTreeNode node = getSelectedNode();

        JPopupMenu popup = ( node instanceof FolderTreeNode ? folderPopup_ : storePopup_ );

        popup.show( tree_, event.getX(), event.getY() );
      }
    }

    public void
    mouseReleased( MouseEvent event ) {
      if ( isPopupClick )
        return;

      if ( event.isPopupTrigger() ) {
        int selRow = tree_.getRowForLocation( event.getX(), event.getY() );

        if ( selRow != -1 ) {
          tree_.setSelectionRow( selRow );
        }

        isPopupClick = true;

        DefaultMutableTreeNode node = getSelectedNode();

        JPopupMenu popup = ( node instanceof FolderTreeNode ? folderPopup_ : storePopup_ );

        popup.show( tree_, event.getX(), event.getY() );
      }
    }

    public void
    mouseClicked( MouseEvent event ) {
      if ( isPopupClick ) {
        isPopupClick = false;
        return;
      }

      if ( event.getClickCount() == 2 ) {
        processDoubleClick();
      }
    }

    private void
    processDoubleClick() {
      openSelectedFolder();
    }
  }

//............................................................

  private class OpenFolderRunner
    implements DialogRunnable
  {
    private Folder    folder_;

    public
    OpenFolderRunner( Folder folder ) {
      folder_ = folder;
    }

    public void
    run( JDialog dialog, JProgressBar progress ) {
      dialog.show();

      progress.setValue( 25 );

      try {
        MailUtilities.setFolderOpenAndReady( folder_, Folder.READ_WRITE );

        progress.setValue( 50 );

        if ( ( folder_.getType() & Folder.HOLDS_MESSAGES ) != 0 ) {
          progress.setValue( 75 );
          messagePanel_.setFolder( folder_ );
        }

        progress.setValue( 100 );
      } catch ( MessagingException ex ) {
        Object[] xargs = new Object[2];
        xargs[0] = folder_.getName();
        xargs[1] = ex.getMessage();
        ComponentFactory.showDialog( ICEMail.getBundle(), "FolderTree.StoreFailed",
                                     0, JOptionPane.ERROR_MESSAGE, xargs );
      }

      dialog.dispose();
    }
  }

}