TA的每日心情 | 开心 2021-3-12 23:18 |
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签到天数: 2 天 [LV.1]初来乍到
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带有自动检查功能的CombBox,类似辅助输入。
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代码:- import java.awt.event.ItemEvent;
- import java.awt.event.ItemListener;
- import java.awt.event.KeyEvent;
- import java.awt.event.KeyListener;
- import java.util.List;
- import java.util.Vector;
- import javax.swing.ComboBoxModel;
- import javax.swing.DefaultComboBoxModel;
- import javax.swing.JComboBox;
- import javax.swing.JFrame;
- import javax.swing.JTextField;
- /**
- * @author fb
- * 带有自动检查功能的CombBox
- */
- public class JAutoCompleteComboBox extends JComboBox {
- private AutoCompleter completer;
-
- public JAutoCompleteComboBox()
- {
- super();
- addCompleter();
- }
-
- public JAutoCompleteComboBox(ComboBoxModel cm) {
- super(cm);
- addCompleter();
- }
-
- public JAutoCompleteComboBox(Object[] items) {
- super(items);
- addCompleter();
- }
-
- public JAutoCompleteComboBox(List v) {
- super((Vector) v);
- addCompleter();
- }
-
- private void addCompleter() {
- setEditable(true);
- completer = new AutoCompleter(this);
- }
-
- public void autoComplete(String str) {
- this.completer.autoComplete(str,str.length());
- }
-
- public String getText() {
- return ((JTextField) getEditor().getEditorComponent()).getText();
- }
-
- public void setText(String text) {
- ((JTextField) getEditor().getEditorComponent()).setText(text);
- }
-
- public boolean containsItem(String itemString)
- {
- for (int i = 0; i < this.getModel().getSize(); i++) {
- String _item = "" + this.getModel().getElementAt(i);
- if (_item.equals(itemString))
- return true;
- }
- return false;
- }
- /*
- * 测试方法
- */
- public static void main(String[] args)
- {
- JFrame frame = new JFrame();
- Object[] items = new Object[] { "abc", "aab", "aba", "hpp", "pp", "hlp" };
- //DefaultComboBoxModel model = new DefaultComboBoxModel();
- JComboBox cmb = new JAutoCompleteComboBox(items);
- // model.addElement("abc");
- // model.addElement("aab");
- // model.addElement("aba");
- // model.addElement("hpp");
- // model.addElement("pp");
- // model.addElement("hlp");
- frame.getContentPane().add(cmb);
- frame.setSize(400, 80);
- frame.setVisible(true);
- }
- }
-
- /**
- * 自动完成器。自动找到最匹配的项目,并排在列表的最前面。
- *
- * @author Turbo Chen
- */
-
- class AutoCompleter implements KeyListener, ItemListener {
-
- private JComboBox owner = null;
- private JTextField editor = null;
-
- private ComboBoxModel model = null;
-
- public AutoCompleter(JComboBox comboBox)
- {
- owner = comboBox;
- editor = (JTextField) comboBox.getEditor().getEditorComponent();
- editor.addKeyListener(this);
- model = comboBox.getModel();
- owner.addItemListener(this);
- }
-
- public void keyTyped(KeyEvent e) { }
-
- public void keyPressed(KeyEvent e) { }
-
- public void keyReleased(KeyEvent e)
- {
- char ch = e.getKeyChar();
- if (ch == KeyEvent.CHAR_UNDEFINED||Character.isISOControl(ch)||ch == KeyEvent.VK_DELETE)
- return;
-
- int caretPosition = editor.getCaretPosition();
- String str = editor.getText();
- if (str.length() == 0)
- return;
- autoComplete(str, caretPosition);
- }
-
- /**
- * 自动完成。根据输入的内容,在列表中找到相似的项目.
- */
- protected void autoComplete(String strf, int caretPosition)
- {
- Object[] opts;
- opts = getMatchingOptions(strf.substring(0, caretPosition));
- if (owner != null) {
- model = new DefaultComboBoxModel(opts);
- owner.setModel(model);
- }
- if (opts.length > 0) {
- String str = opts[0].toString();
- editor.setCaretPosition(caretPosition);
- if (owner != null) {
- try {
- owner.showPopup();
- } catch (Exception ex) {
- ex.printStackTrace();
- }
- }
- }
- }
-
- /**
- *
- * 找到相似的项目, 并且将之排列到数组的最前面。
- * @param str
- * @return 返回所有项目的列表。
- */
- protected Object[] getMatchingOptions(String str)
- {
- List v = new Vector();
- List v1 = new Vector();
-
- for (int k = 0; k < model.getSize(); k++) {
- Object itemObj = model.getElementAt(k);
- if ( itemObj!=null ) {
- String item = itemObj.toString().toLowerCase();
- if (item.startsWith(str.toLowerCase()))
- v.add(model.getElementAt(k));
- else
- v1.add(model.getElementAt(k));
- }else
- v1.add(model.getElementAt(k));
- }
- for (int i = 0; i < v1.size(); i++) {
- v.add(v1.get(i));
- }
- if (v.isEmpty())
- v.add(str);
- return v.toArray();
- }
- public void itemStateChanged(ItemEvent event)
- {
- if (event.getStateChange() == ItemEvent.SELECTED)
- {
- int caretPosition = editor.getCaretPosition();
- if (caretPosition != -1) {
- try {
- editor.moveCaretPosition(caretPosition);
- } catch (IllegalArgumentException ex) {
- ex.printStackTrace();
- }
- }
- }
- }
- }
复制代码
源码下载:http://file.javaxxz.com/2014/11/2/235548734.zip |
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