Implemented the dimension-based converter.

Also added a search box list, and fixed a bug with dimension exponentiation.

1 files changed, 205 insertions, 0 deletions

diff --git a/src/org/unitConverter/converterGUI/SearchBoxList.java b/src/org/unitConverter/converterGUI/SearchBoxList.java
new file mode 100644
index 0000000..7d3b748
--- /dev/null
+++ b/src/org/unitConverter/converterGUI/SearchBoxList.java
@@ -0,0 +1,205 @@
+/**
+ * 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);
+	}
+}