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/**
* Copyright (C) 2019 Adrien Hopkins
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package org.unitConverter.converterGUI;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.util.ArrayList;
import java.util.Collection;
import java.util.function.Predicate;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
/**
* @author Adrien Hopkins
* @since 2019-04-13
*/
final class SearchBoxList extends JPanel {
/**
* @since 2019-04-13
*/
private static final long serialVersionUID = 6226930279415983433L;
/**
* The text to place in an empty search box.
*/
private static final String EMPTY_TEXT = "Search...";
/**
* The color to use for an empty foreground.
*/
private static final Color EMPTY_FOREGROUND = new Color(192, 192, 192);
// the components
private final Collection<String> itemsToFilter;
private final DelegateListModel<String> listModel;
private final JTextField searchBox;
private final JList<String> searchItems;
private boolean searchBoxEmpty = true;
// I need to do this because, for some reason, Swing is auto-focusing my search box without triggering a focus
// event.
private boolean searchBoxFocused = false;
private Predicate<String> searchFilter = o -> true;
/**
* Creates the {@code SearchBoxList}.
*
* @since 2019-04-13
*/
public SearchBoxList(final Collection<String> itemsToFilter) {
super(new BorderLayout(), true);
this.itemsToFilter = itemsToFilter;
// create the components
this.listModel = new DelegateListModel<>(new ArrayList<>(itemsToFilter));
this.searchItems = new JList<>(this.listModel);
this.searchBox = new JTextField(EMPTY_TEXT);
this.searchBox.setForeground(EMPTY_FOREGROUND);
// add them to the panel
this.add(this.searchBox, BorderLayout.PAGE_START);
this.add(new JScrollPane(this.searchItems), BorderLayout.CENTER);
// set up the search box
this.searchBox.addFocusListener(new FocusListener() {
@Override
public void focusGained(final FocusEvent e) {
SearchBoxList.this.searchBoxFocusGained(e);
}
@Override
public void focusLost(final FocusEvent e) {
SearchBoxList.this.searchBoxFocusLost(e);
}
});
this.searchBox.addCaretListener(e -> this.searchBoxTextChanged());
this.searchBoxEmpty = true;
}
/**
* Adds an additional filter for searching.
*
* @param filter
* filter to add.
* @since 2019-04-13
*/
public void addSearchFilter(final Predicate<String> filter) {
this.searchFilter = this.searchFilter.and(filter);
}
/**
* Resets the search filter.
*
* @since 2019-04-13
*/
public void clearSearchFilters() {
this.searchFilter = o -> true;
}
/**
* @return value selected in item list
* @since 2019-04-13
*/
public String getSelectedValue() {
return this.searchItems.getSelectedValue();
}
/**
* Re-applies the filters.
*
* @since 2019-04-13
*/
public void reapplyFilter() {
final String searchText = this.searchBoxEmpty ? "" : this.searchBox.getText();
final FilterComparator comparator = new FilterComparator(searchText);
this.listModel.clear();
this.itemsToFilter.forEach(string -> {
if (string.toLowerCase().contains(searchText.toLowerCase())) {
this.listModel.add(string);
}
});
// applies the custom filters
this.listModel.removeIf(this.searchFilter.negate());
// sorts the remaining items
this.listModel.sort(comparator);
}
/**
* Runs whenever the search box gains focus.
*
* @param e
* focus event
* @since 2019-04-13
*/
private void searchBoxFocusGained(final FocusEvent e) {
this.searchBoxFocused = true;
if (this.searchBoxEmpty) {
this.searchBox.setText("");
this.searchBox.setForeground(Color.BLACK);
}
}
/**
* Runs whenever the search box loses focus.
*
* @param e
* focus event
* @since 2019-04-13
*/
private void searchBoxFocusLost(final FocusEvent e) {
this.searchBoxFocused = false;
if (this.searchBoxEmpty) {
this.searchBox.setText(EMPTY_TEXT);
this.searchBox.setForeground(EMPTY_FOREGROUND);
}
}
private void searchBoxTextChanged() {
if (this.searchBoxFocused) {
this.searchBoxEmpty = this.searchBox.getText().equals("");
}
final String searchText = this.searchBoxEmpty ? "" : this.searchBox.getText();
final FilterComparator comparator = new FilterComparator(searchText);
// initialize list with items that match the filter then sort
this.listModel.clear();
this.itemsToFilter.forEach(string -> {
if (string.toLowerCase().contains(searchText.toLowerCase())) {
this.listModel.add(string);
}
});
// applies the custom filters
this.listModel.removeIf(this.searchFilter.negate());
// sorts the remaining items
this.listModel.sort(comparator);
}
}
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