// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.gui.tagging.ac;
import java.awt.Component;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.EventObject;
import javax.swing.ComboBoxEditor;
import javax.swing.JTable;
import javax.swing.event.CellEditorListener;
import javax.swing.table.TableCellEditor;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.PlainDocument;
import javax.swing.text.StyleConstants;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.gui.util.CellEditorSupport;
import org.openstreetmap.josm.gui.widgets.JosmTextField;
/**
* AutoCompletingTextField is a text field with autocompletion behaviour. It
* can be used as table cell editor in {@link JTable}s.
*
* Autocompletion is controlled by a list of {@link AutoCompletionListItem}s
* managed in a {@link AutoCompletionList}.
*
* @since 1762
*/
public class AutoCompletingTextField extends JosmTextField implements ComboBoxEditor, TableCellEditor {
private Integer maxChars;
/**
* The document model for the editor
*/
class AutoCompletionDocument extends PlainDocument {
@Override
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
// If a maximum number of characters is specified, avoid to exceed it
if (maxChars != null && str != null && getLength() + str.length() > maxChars) {
int allowedLength = maxChars-getLength();
if (allowedLength > 0) {
str = str.substring(0, allowedLength);
} else {
return;
}
}
if (autoCompletionList == null) {
super.insertString(offs, str, a);
return;
}
// input method for non-latin characters (e.g. scim)
if (a != null && a.isDefined(StyleConstants.ComposedTextAttribute)) {
super.insertString(offs, str, a);
return;
}
// if the current offset isn't at the end of the document we don't autocomplete.
// If a highlighted autocompleted suffix was present and we get here Swing has
// already removed it from the document. getLength() therefore doesn't include the
// autocompleted suffix.
//
if (offs < getLength()) {
super.insertString(offs, str, a);
return;
}
String currentText = getText(0, getLength());
// if the text starts with a number we don't autocomplete
if (Main.pref.getBoolean("autocomplete.dont_complete_numbers", true)) {
try {
Long.parseLong(str);
if (currentText.length() == 0) {
// we don't autocomplete on numbers
super.insertString(offs, str, a);
return;
}
Long.parseLong(currentText);
super.insertString(offs, str, a);
return;
} catch(NumberFormatException e) {
// either the new text or the current text isn't a number. We continue with
// autocompletion
}
}
String prefix = currentText.substring(0, offs);
autoCompletionList.applyFilter(prefix+str);
if (autoCompletionList.getFilteredSize()>0) {
// there are matches. Insert the new text and highlight the
// auto completed suffix
//
String matchingString = autoCompletionList.getFilteredItem(0).getValue();
remove(0,getLength());
super.insertString(0,matchingString,a);
// highlight from insert position to end position to put the caret at the end
setCaretPosition(offs + str.length());
moveCaretPosition(getLength());
} else {
// there are no matches. Insert the new text, do not highlight
//
String newText = prefix + str;
remove(0,getLength());
super.insertString(0,newText,a);
setCaretPosition(getLength());
}
}
}
/** the auto completion list user input is matched against */
protected AutoCompletionList autoCompletionList = null;
@Override
protected Document createDefaultModel() {
return new AutoCompletionDocument();
}
protected final void init() {
addFocusListener(
new FocusAdapter() {
@Override public void focusGained(FocusEvent e) {
selectAll();
applyFilter(getText());
}
}
);
addKeyListener(
new KeyAdapter() {
@Override
public void keyReleased(KeyEvent e) {
if (getText().isEmpty()) {
applyFilter("");
}
}
}
);
tableCellEditorSupport = new CellEditorSupport(this);
}
/**
* Constructs a new {@code AutoCompletingTextField}.
*/
public AutoCompletingTextField() {
init();
}
/**
* Constructs a new {@code AutoCompletingTextField}.
* @param columns the number of columns to use to calculate the preferred width;
* if columns is set to zero, the preferred width will be whatever naturally results from the component implementation
*/
public AutoCompletingTextField(int columns) {
super(columns);
init();
}
protected void applyFilter(String filter) {
if (autoCompletionList != null) {
autoCompletionList.applyFilter(filter);
}
}
/**
* Returns the auto completion list.
* @return the auto completion list; may be null, if no auto completion list is set
*/
public AutoCompletionList getAutoCompletionList() {
return autoCompletionList;
}
/**
* Sets the auto completion list.
* @param autoCompletionList the auto completion list; if null, auto completion is
* disabled
*/
public void setAutoCompletionList(AutoCompletionList autoCompletionList) {
this.autoCompletionList = autoCompletionList;
}
@Override
public Component getEditorComponent() {
return this;
}
@Override
public Object getItem() {
return getText();
}
@Override
public void setItem(Object anObject) {
if (anObject == null) {
setText("");
} else {
setText(anObject.toString());
}
}
/**
* Sets the maximum number of characters allowed.
* @param max maximum number of characters allowed
* @since 5579
*/
public void setMaxChars(Integer max) {
maxChars = max;
}
/* ------------------------------------------------------------------------------------ */
/* TableCellEditor interface */
/* ------------------------------------------------------------------------------------ */
private CellEditorSupport tableCellEditorSupport;
private String originalValue;
@Override
public void addCellEditorListener(CellEditorListener l) {
tableCellEditorSupport.addCellEditorListener(l);
}
protected void rememberOriginalValue(String value) {
this.originalValue = value;
}
protected void restoreOriginalValue() {
setText(originalValue);
}
@Override
public void removeCellEditorListener(CellEditorListener l) {
tableCellEditorSupport.removeCellEditorListener(l);
}
@Override
public void cancelCellEditing() {
restoreOriginalValue();
tableCellEditorSupport.fireEditingCanceled();
}
@Override
public Object getCellEditorValue() {
return getText();
}
@Override
public boolean isCellEditable(EventObject anEvent) {
return true;
}
@Override
public boolean shouldSelectCell(EventObject anEvent) {
return true;
}
@Override
public boolean stopCellEditing() {
tableCellEditorSupport.fireEditingStopped();
return true;
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
setText( value == null ? "" : value.toString());
rememberOriginalValue(getText());
return this;
}
}