java Swing 的下拉框JComboBox可编辑可多选示例

ゞ浴缸里的玫瑰 2023-06-28 14:27 153阅读 0赞

先上图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5_size_16_color_FFFFFF_t_70][]

代码如下：

package com.java.swing.table;
    
    public class testJComboBox {
    	public static void main(String[] args) {
    		String str[][] = new String[10][3];
    		for (int i = 0; i < str.length; i++) {
    			str[i][0] = i + 6 + "";
    		}
    		javax.swing.JComboBox jComboBox = new RwJComboBox(str);
    		jComboBox.setEditable(true);
    		jComboBox.setPreferredSize(new java.awt.Dimension(400, 60));
    
    		javax.swing.JTextField jTextField = new javax.swing.JTextField(40);
    		// 测试焦点事件
    
    		javax.swing.JFrame frame = new javax.swing.JFrame();
    		frame.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.CENTER, 20, 20));
    		frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
    		frame.setSize(500, 500);
    		frame.setLocationRelativeTo(null);
    		frame.add(jComboBox);
    		frame.add(jTextField);
    		frame.setVisible(true);
    	}
    
    	public static class RwJComboBox extends javax.swing.JComboBox implements java.awt.event.FocusListener {
    		protected java.util.Set set = new java.util.HashSet();
    
    		public RwJComboBox(String str[][]) {
    			setModel(new RwDefaultComboBoxModel(str));
    			setUI(new RwMetalComboBoxUI(this));
    			setRenderer(new RwJCheckBox());
    			setSelectedIndex(-1);
    //            ((javax.swing.JTextField)getEditor().getEditorComponent()).setEditable(false);
    //            禁止编辑的代码
    		}
    
    		public void focusGained(java.awt.event.FocusEvent e) {
    		}
    
    		public void focusLost(java.awt.event.FocusEvent e) {
    //            这是一种特殊情况下的使用方法
    //            java.awt.Container container=(java.awt.Container)getEditor().getEditorComponent();
    //            while(container!=null&&!(container instanceof  javax.swing.JLabel))
    //            {
    //                container=container.getParent();
    //            }
    //            ((cLabel)container).setValue(((javax.swing.JTextField)getEditor().getEditorComponent()).getText());
    		}
    	}
    
    	public static class RwMetalComboBoxUI extends javax.swing.plaf.metal.MetalComboBoxUI {
    		private RwMetalComboBoxUI(RwJComboBox rwJComboBox) {
    			this.comboBox = rwJComboBox;
    		}
    
    		protected javax.swing.plaf.basic.ComboPopup createPopup() {
    			return new RwBasicComboPopup(comboBox);
    		}
    	}
    
    	public static class RwBasicComboPopup extends javax.swing.plaf.basic.BasicComboPopup {
    		public RwBasicComboPopup(javax.swing.JComboBox combo) {
    			super(combo);
    		}
    
    		protected void configureList() {
    			super.configureList();
    			list.setSelectionModel(new RwDefaultListSelectionModel(comboBox));
    		}
    
    		protected java.awt.event.MouseListener createListMouseListener() {
    			return new RwMouseAdapter(list, comboBox);
    		}
    	}
    
    	private static class RwDefaultListSelectionModel extends javax.swing.DefaultListSelectionModel {
    		protected RwJComboBox rwJComboBox;
    
    		public RwDefaultListSelectionModel(javax.swing.JComboBox comboBox) {
    			this.rwJComboBox = (RwJComboBox) comboBox;
    		}
    
    		public boolean isSelectedIndex(int index) {
    			return rwJComboBox.set.contains(index);
    		}
    	}
    
    	private static class RwMouseAdapter extends java.awt.event.MouseAdapter {
    		protected javax.swing.JList list;
    		protected RwJComboBox rwJComboBox;
    
    		private RwMouseAdapter(javax.swing.JList list, javax.swing.JComboBox comboBox) {
    			this.list = list;
    			this.rwJComboBox = (RwJComboBox) comboBox;
    		}
    
    		public void mousePressed(java.awt.event.MouseEvent anEvent) {
    			StringBuilder sb, sb1, sb2, sb3;
    			int k, index;
    			index = list.getSelectedIndex();
    			javax.swing.JTextField jTextField = (javax.swing.JTextField) rwJComboBox.getEditor().getEditorComponent();
    			sb = new StringBuilder(jTextField.getText());
    
    			if (sb.length() > 0 && ',' != sb.charAt(0))
    				sb.insert(0, ",");
    			if (sb.length() > 0 && ',' != sb.charAt(sb.length() - 1))
    				sb.append(",");
    			if (sb.length() > 0 && ",".equals(sb.toString()))
    				sb = new StringBuilder();
    			if (list.getSelectionMode() == javax.swing.ListSelectionModel.MULTIPLE_INTERVAL_SELECTION) {
    				if (rwJComboBox.set.contains(index)) {
    					rwJComboBox.set.remove(index);
    					sb1 = new StringBuilder();
    					sb1.append(",").append(rwJComboBox.getModel().getElementAt(index)).append(",");
    					k = sb.indexOf(sb1.toString());
    					while (k != -1) {
    						sb.replace(k, k + sb1.length(), ",");
    						k = sb.indexOf(sb1.toString());
    					}
    				} else {
    					rwJComboBox.set.add(index);
    					if (sb.length() == 0)
    						sb.append(",").append(rwJComboBox.getModel().getElementAt(index)).append(",");
    					else
    						sb.append(rwJComboBox.getModel().getElementAt(index)).append(",");
    				}
    			} else {
    				if (!rwJComboBox.set.contains(index)) {
    					rwJComboBox.set.clear();
    					rwJComboBox.set.add(index);
    				}
    			}
    			Object obj;
    			sb2 = new StringBuilder(sb);
    			// 替换完正常的可选值
    			for (int i = 0; i < list.getModel().getSize(); i++) {
    				obj = list.getModel().getElementAt(i);
    				sb1 = new StringBuilder();
    				sb1.append(",").append(obj).append(",");
    				k = sb2.indexOf(sb1.toString());
    				while (k != -1) {
    					sb2.replace(k, k + sb1.length(), ",");
    					k = sb2.indexOf(sb1.toString());
    				}
    			}
    			java.util.List list1 = new java.util.ArrayList(rwJComboBox.set);
    			java.util.Collections.sort(list1);
    			for (int i = 0; i < list1.size(); i++) {
    				obj = rwJComboBox.getModel().getElementAt(Integer.parseInt(list1.get(i).toString()));
    				sb1 = new StringBuilder();
    				sb1.append(",").append(obj).append(",");
    				k = sb.indexOf(sb1.toString());
    				if (k != -1 && sb2.indexOf(sb1.toString()) == -1) {
    					sb2.append(obj).append(",");
    				}
    			}
    			sb = new StringBuilder(sb2);
    			if (sb.length() > 0 && ',' == sb.charAt(0))
    				sb.deleteCharAt(0);
    			if (sb.length() > 0 && ',' == sb.charAt(sb.length() - 1))
    				sb.deleteCharAt(sb.length() - 1);
    			if (sb.length() > 0 && ",".equals(sb.toString()))
    				sb = new StringBuilder();
    			jTextField.setText(sb.toString());
    			// java.awt.Container container =jTextField;
    			// while(container!=null&&!(container instanceof javax.swing.JLabel))
    			// {
    			// container=container.getParent();
    			// }
    			// ((cLabel)container).setValue(sb.toString());
    			rwJComboBox.repaint();
    			list.repaint();
    		}
    	}
    
    	public static class RwDefaultComboBoxModel extends javax.swing.DefaultComboBoxModel {
    		private RwDefaultComboBoxModel(String[][] str) {
    			for (int i = 0; i < str.length; i++)
    				addElement(str[i][0]);
    		}
    	}
    
    	public static class RwJCheckBox extends javax.swing.JCheckBox implements javax.swing.ListCellRenderer {
    		public java.awt.Component getListCellRendererComponent(javax.swing.JList list, Object value, int index,
    				boolean isSelected, boolean cellHasFocus) {
    			setComponentOrientation(list.getComponentOrientation());
    			if (isSelected) {
    				setBackground(list.getSelectionBackground());
    				setForeground(list.getSelectionForeground());
    			} else {
    				setBackground(list.getBackground());
    				setForeground(list.getForeground());
    			}
    			setEnabled(list.isEnabled());
    			setSelected(isSelected);
    			setText(value == null ? "" : value.toString());
    			setFont(list.getFont());
    			return this;
    		}
    	}
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/2020010914415247.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5,size_16,color_FFFFFF,t_70