在JTable中添加或刪除行后如何刷新JTree

Question

我正在嘗試使用JTree和JTable為電影數據庫創建GUI。 但是我有問題，當我想從JTable添加或刪除某些行時，我不知道如何在JTree中顯示此更改。 我嘗試添加kategorieFilmu.add kategorieFilmu.add(node)或kategorieFilmu.remove(row) ，但是不起作用。 而且我還嘗試使用panelJTree.repaint刷新JTree。

JTable：

      protected JScrollPane jTable() 
      {                   
      vypisFilmu.setRowSorter(sorter);    
      sorter.setRowFilter(RowFilter.regexFilter(""));   
      vypisFilmu.setModel(spravaFilmu.getModel());        

      class ButtonEditor extends DefaultCellEditor {
        private static final long serialVersionUID = 1L;

          protected JButton button;
          private String label;
          private boolean isPushed;

          public ButtonEditor(JCheckBox checkBox) {
            super(checkBox);
            button = new JButton();
            button.setOpaque(true);
            button.addActionListener(new ActionListener() {
              public void actionPerformed(ActionEvent e) {
                fireEditingStopped();
              }
            });
          }

          public Component getTableCellEditorComponent(JTable table, Object value,
              boolean isSelected, int row, int column) {
            button.setText(label);
            int index = (Integer) vypisFilmu.getValueAt(row, 0);
            spravaFilmu.removeRow(index); //DELETE row
            spravaFilmu.getFilmy().add(new film("", "", 0, 0,"", false)); //ADD new - without this it trows exception, because one row is missing 
            panelJTable.repaint();
                      /*kategorieFilmu.remove(row);
            panelJTree.repaint();*/
            isPushed = true;
            return button;
          }

          public boolean stopCellEditing() {
            isPushed = false;
            return super.stopCellEditing();
          }

          protected void fireEditingStopped() {
            super.fireEditingStopped();
          }
        }

      class ButtonRenderer extends JButton implements TableCellRenderer {
        private static final long serialVersionUID = 1L;

        public ButtonRenderer() {
            setOpaque(true);
          }

          public Component getTableCellRendererComponent(JTable table, Object value,
              boolean isSelected, boolean hasFocus, int row, int column) {
            if (isSelected) {
              setForeground(table.getSelectionForeground());
              setBackground(table.getSelectionBackground());
            } else {
              setForeground(table.getForeground());
              setBackground(UIManager.getColor("Button.background"));
            }
            setText((value == null) ? "" : value.toString());
            return this;
          }
        }
      vypisFilmu.getColumn("Smazat").setCellRenderer(new ButtonRenderer());
      vypisFilmu.getColumn("Smazat").setCellEditor(new ButtonEditor(new JCheckBox()));    

      DefaultTableCellRenderer centerRenderer = new DefaultTableCellRenderer();
      centerRenderer.setHorizontalAlignment( JLabel.CENTER );
      TableColumn column = null;


      final JScrollPane panelJTable = new JScrollPane(vypisFilmu);
      hlavniOkno.this.add(BorderLayout.CENTER, panelJTable);
      return panelJTable;
  }

JTree：

private JTree kategorieFilmu;

      protected JScrollPane jTree()
      {   
    kategorieFilmu = new JTree(root);
          add(kategorieFilmu);

          root.add(akcni);  
          root.add(animovany);
          root.add(drama);
          root.add(komedie);

          for(int i = 0; i < pocetFilmu;i++)
          {   
              if(spravaFilmu.getFilmy().get(i).getZanr().equals("Akční"))
                      {                 
                        DefaultMutableTreeNode nazevNode = new DefaultMutableTreeNode(spravaFilmu.getFilmy().get(i).getNazev());
                        akcni.add(nazevNode);
                      }
              else if(spravaFilmu.getFilmy().get(i).getZanr().equals("Animovaný"))
              {                 
                DefaultMutableTreeNode nazevNode = new DefaultMutableTreeNode(spravaFilmu.getFilmy().get(i).getNazev());
                animovany.add(nazevNode);
              }
              else if(spravaFilmu.getFilmy().get(i).getZanr().equals("Drama"))
              {                 
                DefaultMutableTreeNode nazevNode = new DefaultMutableTreeNode(spravaFilmu.getFilmy().get(i).getNazev());
                drama.add(nazevNode);
              }
              else if(spravaFilmu.getFilmy().get(i).getZanr().equals("Komedie"))
              {                 
                DefaultMutableTreeNode nazevNode = new DefaultMutableTreeNode(spravaFilmu.getFilmy().get(i).getNazev());
                komedie.add(nazevNode);
              }
              else {}
          }           


          /****** Select category ******/
          kategorieFilmu.getSelectionModel().addTreeSelectionListener(new TreeSelectionListener() {
              @Override
              public void valueChanged(TreeSelectionEvent e) {
                  DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) kategorieFilmu.getLastSelectedPathComponent();
                  if(selectedNode.getUserObject().toString() == "Všechny filmy")
                  {
                      sorter.setRowFilter(RowFilter.regexFilter(""));   
                      vypisFilmu.setModel(spravaFilmu.getModel()); 
                  }
                  else
                  {
                      sorter.setRowFilter(RowFilter.regexFilter(selectedNode.getUserObject().toString()));  
                      vypisFilmu.setModel(spravaFilmu.getModel());
                  }

              }
          });

          final JScrollPane panelJTree = new JScrollPane(kategorieFilmu);
          panelJTree.setPreferredSize(new Dimension(180,520));
          hlavniOkno.this.add(BorderLayout.LINE_START, panelJTree);
          return panelJTree;
      }

表格模型：

public class spravaFilmu {

    private ArrayList<film> filmy = new ArrayList<>();
    private TableModel model;

    public spravaFilmu()
    {
        // Testovací data
        filmy.add(new film("Expendables: Postradatelní", "Akční", 2010, 103,"Sylvester Stallone", true));
        filmy.add(new film("Rivalové", "Akční", 2013, 123,"Ron Howard", true));
        filmy.add(new film("Temný rytíř povstal", "Akční", 2012, 158,"Christopher Nolan", true));
        filmy.add(new film("Avengers", "Akční", 2012, 143,"Joss Whedon", false));
        filmy.add(new film("Skyfall", "Akční", 2012, 143,"Sam Mendes", true));
        filmy.add(new film("Expendables 2, The", "Akční", 2012, 103,"   Simon West ", false));
        filmy.add(new film("Iron Man 3", "Akční", 2013, 130,"Shane Black", true));
        filmy.add(new film("Raubíř Ralf", "Animovaný", 2012, 97,"Rich Moore", true));
        filmy.add(new film("LEGO® příběh", "Animovaný", 2014, 100,"Phil Lord", true));
        filmy.add(new film("Croodsovi", "Animovaný", 2013, 90,"Chris Sanders", true));
        filmy.add(new film("Ledové království", "Animovaný", 2013, 102,"Chris Buck", true));
        filmy.add(new film("Hon", "Drama", 2012, 115,"Thomas Vinterberg", true));
        filmy.add(new film("Nespoutaný Django", "Drama", 2012, 165,"Quentin Tarantino", true));
        filmy.add(new film("Grandhotel Budapešť", "Komedie", 2014, 100,"Wes Anderson", true));
        filmy.add(new film("Vlk z Wall Street", "Komedie", 2013, 180,"Martin Scorsese", true));
        filmy.add(new film("Lásky čas", "Komedie", 2013, 123,"Richard Curtis", true));
        filmy.add(new film("Stuck in Love", "Komedie", 2012, 97,"Josh Boone", false));   

        // Definice vlastního modelu JTable 
        model = new AbstractTableModel() {

            private static final long serialVersionUID = 1L;
            String[] nazvySloupcu = {"ID", "Název", "Žánr", "Rok", "Délka (min)", "Režie", "Dabing", "Smazat"};
            @Override
            public String getColumnName(int col) { return nazvySloupcu[col]; }
            @Override
            public int getRowCount() { return getFilmy().size(); }
            @Override
            public int getColumnCount() { return nazvySloupcu.length; }
            @Override
            public Object getValueAt(int row, int col) {
                film film = getFilmy().get(row);
                switch (col)
                {
                    case 0:
                        return film.getId();
                    case 1:
                        return film.getNazev();
                    case 2:
                        return film.getZanr();
                    case 3:
                        return film.getRok();
                    case 4:
                        return film.getDelka();
                    case 5:
                        return film.getRezie();
                    case 6:
                        return film.getDabing();
                    case 7:
                        return "X";
                }
                return film;
            }
            @Override
            public boolean isCellEditable(int row, int col) { return true; }

        };

    }

    public ArrayList<film> getFilmy() {
        return filmy;
    }

    public TableModel getModel() {
        return model;
    }

    public void removeRow(int index)
    {
        filmy.remove(index);
    }
}

如果有任何幫助，我將不勝感激。

Answer 1

如果您修改了此模型所依賴的TreeNode，請嘗試使用DefaultTreeModel＃reload（）並調用此方法。 該模型將通知其所有偵聽器該模型在給定節點下已更改。

樣例代碼：

DefaultTreeModel model = (DefaultTreeModel)tree.getModel().getRoot();
model.reload((TreeNode) model.getRoot());

注意：

• 同樣，只需重新加載更新后節點的直接父節點即可。
• 我相信您正在使用DefaultTreeModel根據@MadProgrammer在以下注釋中的建議從JTree添加和刪​​除節點。

有關使用DefaultTreeModel更多信息和示例，請參見《 Java教程》中的“如何使用樹” 。 專門查看“ 動態更改樹”部分。

在這里和這里找到有關刷新JTree更多解決方案。