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// Copyright (c) 2016 Timothy D. Jones
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package io.github.jonestimd.swing.component;

import java.awt.event.FocusEvent;
import java.awt.event.KeyEvent;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.swing.JFormattedTextField;
import javax.swing.KeyStroke;
import javax.swing.border.Border;
import javax.swing.border.CompoundBorder;
import javax.swing.text.DateFormatter;

import io.github.jonestimd.swing.ComponentTreeUtils;

/**
 * A formatted text field for selecting a date. The date can be typed or selected from a calendar popup menu.  The
 * popup menu is activated by clicking on a {@link CalendarButtonBorder}.
 * 

Keyboard

* The default keyboard behavior is the same as for a {@link JFormattedTextField} with the following exceptions: *
    *
  • the focus-lost behavior defaults to {@link JFormattedTextField#COMMIT_OR_REVERT}
  • *
  • {@code ESC} does not reset the field value
  • *
  • typing the sub-field separator character selects the next date sub-field
  • *
  • the {@code up} and {@code down} keys can be used to increment/decrement the current sub-field
  • *
* @see DateFormatter * @see SimpleDateFormat * @see CalendarButtonBorder * @see CalendarPanel */ public class DateField extends JFormattedTextField { private static final int FORMATTED_LENGTH = 10; public static final String SEPARATOR_STRING = "/"; public static final String NULL_TEXT = SEPARATOR_STRING + SEPARATOR_STRING; public static final char SEPARATOR = SEPARATOR_STRING.charAt(0); public static final String FIELD_PATTERN = "([0-9]+/?)*"; private CalendarButtonBorder calendarButtonBorder; /** * Construct a new {@code DateField} using a {@link SimpleDateFormat} to parse the input. * @param dateFormat the date format pattern used to create the {@link SimpleDateFormat} */ public DateField(String dateFormat) { super(new DateFormatter(new SimpleDateFormat(dateFormat))); getInputMap(WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), "disable-reset-field-edit"); setFocusLostBehavior(JFormattedTextField.COMMIT_OR_REVERT); calendarButtonBorder = new CalendarButtonBorder(this); setBorder(getBorder()); setValue(new Date()); } /** * Overridden to combine {@code border} with a {@link CalendarButtonBorder}. If {@code border} is {@code null} then * the {@link CalendarButtonBorder} is used alone. * @param border the border to use as the outer component of a {@link CompoundBorder} */ @Override public void setBorder(Border border) { super.setBorder(border == null ? calendarButtonBorder : new CompoundBorder(border, calendarButtonBorder)); } /** * Overridden to select the first date sub-field after updating the selected date. * @param value the selected date */ @Override public void setValue(Object value) { super.setValue(value); if (value == null) { setText(NULL_TEXT); setCaretPosition(0); } else selectField(0); } /** * Overridden to cast the value to a {@link Date}. * @return the currently selected date. */ @Override public Date getValue() { return (Date) super.getValue(); } private void selectField(int dot) { int from = getText().lastIndexOf(SEPARATOR, dot) + 1; int to = getText().indexOf(SEPARATOR, from); setCaretPosition(from); moveCaretPosition(to > 0 ? to : getText().length()); } private void selectNextField() { String text = getText(); int slash = text.indexOf(SEPARATOR, getCaretPosition()); if (slash >= 0) { setCaretPosition(slash + 1); slash = text.indexOf(SEPARATOR, slash+1); moveCaretPosition(slash > 0 ? slash : text.length()); } else { selectField(0); } } /** * Overridden to ignore invalid input. The {@code content} must match the {@link #FIELD_PATTERN} regular expression. * @param content the replacement for the selected content */ @Override public void replaceSelection(String content) { if (content.matches(FIELD_PATTERN)) { super.replaceSelection(content); removeExtraFields(); } } private void removeExtraFields() { String text = getText(); String[] fields = text.split(SEPARATOR_STRING); if (fields.length > 3) { setText(Stream.of(fields).limit(3).collect(Collectors.joining(SEPARATOR_STRING))); selectField(0); } } @Override protected void processComponentKeyEvent(KeyEvent e) { if (e.getID() == KeyEvent.KEY_TYPED && e.getKeyChar() == SEPARATOR) { selectNextField(); e.consume(); } else if (e.getID() == KeyEvent.KEY_PRESSED && e.getModifiers() == 0) { if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE) { if (!deleteSelectedDigits()) { int caret = getCaretPosition(); if (caret > 0) { if (getText().charAt(caret - 1) == SEPARATOR) { setCaretPosition(caret - 1); } else { deleteCharAt(caret - 1, caret - 1); } } } e.consume(); } else if (e.getKeyCode() == KeyEvent.VK_DELETE) { if (!deleteSelectedDigits()) { int caret = getCaretPosition(); if (caret < getDocument().getLength()) { int toDelete = skipSeparators(); if (toDelete < getDocument().getLength()) { deleteCharAt(toDelete, caret); } } } e.consume(); } else if (e.getKeyCode() == KeyEvent.VK_UP || e.getKeyCode() == KeyEvent.VK_KP_UP || e.getKeyCode() == KeyEvent.VK_DOWN || e.getKeyCode() == KeyEvent.VK_KP_DOWN) { try { if (getText().length() < FORMATTED_LENGTH) { Date value = (Date) getFormatter().stringToValue(getText()); int dot = getCaretPosition(); int field = getText().substring(0, dot).replaceAll("[^/]", "").length(); setText(getFormatter().valueToString(value)); setCaretPosition(field * 3); } } catch (ParseException e1) { // ignore } } } super.processComponentKeyEvent(e); } private int skipSeparators() { String text = getText(); int caret = getCaretPosition(); while (caret < text.length() && text.charAt(caret) == SEPARATOR) caret++; return caret; } private void deleteCharAt(int pos, int newCaret) { StringBuilder text = new StringBuilder(getText()); setText(text.deleteCharAt(pos).toString()); setCaretPosition(newCaret); } /** * Delete the digit characters from the selection but leave the separators. * @return true if there was a selection and the text was updated. */ private boolean deleteSelectedDigits() { int start = Math.min(getCaret().getDot(), getCaret().getMark()); int end = Math.max(getCaret().getDot(), getCaret().getMark()); if (start != end) { StringBuilder text = new StringBuilder(getText()); for (int i = end-1; i >= start; i--) { if (text.charAt(i) != SEPARATOR) { text.deleteCharAt(i); } } setText(text.toString()); setCaretPosition(start); return true; } return false; } /** * Overridden to select a field when the focus is gained. If the opposite component is not an ancestor then the * field containing the caret position is selected. If the opposite component is an ancestor and the caret * position is not in the first field then the current field is selected (special case for a table * cell editor and the edit was started by typing {@code '/'}). */ @Override protected void processFocusEvent(FocusEvent event) { int position = getCaretPosition(); super.processFocusEvent(event); if (! event.isTemporary() && event.getID() == FocusEvent.FOCUS_GAINED) { if (ComponentTreeUtils.isAncestor(this, event.getOppositeComponent())) { if (position >= 2) selectField(position); } else { selectField(position-1); } } } }




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