有人可以告诉我如何更改此代码以进行自动选择，并且我可以编写不存在的项目，因为它不允许我编写新项目。
public class ComboBoxFill extends PlainDocument
{
ComboBoxModel model;
JComboBox comboBox=new JComboBox();
JTextComponent editor;
public ComboBoxFill(ComboBoxModel model, JComboBox comboBox,JTextComponent editor)
{
this.model = model;
this.comboBox=comboBox;
this.editor=editor;
}
public void insertString (int offs,String str,AttributeSet a) throws BadLocationException
{
String currentText=getText(0,getLength());
String beforeOffset=currentText.substring(0,offs);
String afterOffset=currentText.substring(offs,currentText.length());
String futureText = beforeOffset+str+afterOffset;
Object item =lookupItem(futureText);
if (item!=null)
{
comboBox.setSelectedItem(item);
}else
{
item = comboBox.getSelectedItem();
offs=offs-str.length();
comboBox.getToolkit().beep();
}
super.remove(0, getLength());
super.insertString(0, item.toString(), a);
if (item.toString().equals(str)&&offs==0)
{
highlightCompletedText(0);
}else{
highlightCompletedText(offs+str.length());
comboBox.setPopupVisible(true);
}
}
private boolean startsWithIgnoreCase(String str1, String str2) {
return str1.toUpperCase().startsWith(str2.toUpperCase());
}
private void highlightCompletedText(int start)
{
editor.setCaretPosition (getLength());
editor.moveCaretPosition(start);
}
private Object lookupItem(String pattern)
{
Object selectedItem=model.getSelectedItem();
if (selectedItem!=null && startsWithIgnoreCase(selectedItem.toString(), pattern)){
return selectedItem;
}else{
for (int i=0, n=model.getSize();i<n;i++){
Object currentItem = model.getElementAt(i);
if (startsWithIgnoreCase(currentItem.toString(),pattern))
{
return currentItem;
}
}
}
return null;
}
}
我这样调用它:
JTextComponent editor3 = (JTextComponent) comboBox_2.getEditor().getEditorComponent();
editor3.setDocument(new ComboBoxFill(comboBox_2.getModel(),comboBox_2, editor3));
最佳答案
Java2s 有一个示例:AutocompleteComboBox
关于java 组合框自动完成，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6777473/