--- /dev/null
+/*
+ * Jexer - Java Text User Interface
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (C) 2019 Kevin Lamonte
+ *
+ * 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.
+ *
+ * @author Kevin Lamonte [kevin.lamonte@gmail.com]
+ * @version 1
+ */
+package jexer;
+
+import jexer.bits.CellAttributes;
+import jexer.bits.GraphicsChars;
+import jexer.event.TKeypressEvent;
+import jexer.event.TMouseEvent;
+import static jexer.TKeypress.*;
+
+/**
+ * TSpinner implements a simple up/down spinner.
+ */
+public class TSpinner extends TWidget {
+
+ // ------------------------------------------------------------------------
+ // Variables --------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * The action to perform when the user clicks on the up arrow.
+ */
+ private TAction upAction = null;
+
+ /**
+ * The action to perform when the user clicks on the down arrow.
+ */
+ private TAction downAction = null;
+
+ // ------------------------------------------------------------------------
+ // Constructors -----------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Public constructor.
+ *
+ * @param parent parent widget
+ * @param x column relative to parent
+ * @param y row relative to parent
+ * @param upAction action to call when the up arrow is clicked or pressed
+ * @param downAction action to call when the down arrow is clicked or
+ * pressed
+ */
+ public TSpinner(final TWidget parent, final int x, final int y,
+ final TAction upAction, final TAction downAction) {
+
+ // Set parent and window
+ super(parent, x, y, 2, 1);
+
+ this.upAction = upAction;
+ this.downAction = downAction;
+ }
+
+ // ------------------------------------------------------------------------
+ // Event handlers ---------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Returns true if the mouse is currently on the up arrow.
+ *
+ * @param mouse mouse event
+ * @return true if the mouse is currently on the up arrow
+ */
+ private boolean mouseOnUpArrow(final TMouseEvent mouse) {
+ if ((mouse.getY() == 0)
+ && (mouse.getX() == getWidth() - 2)
+ ) {
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Returns true if the mouse is currently on the down arrow.
+ *
+ * @param mouse mouse event
+ * @return true if the mouse is currently on the down arrow
+ */
+ private boolean mouseOnDownArrow(final TMouseEvent mouse) {
+ if ((mouse.getY() == 0)
+ && (mouse.getX() == getWidth() - 1)
+ ) {
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Handle mouse checkbox presses.
+ *
+ * @param mouse mouse button down event
+ */
+ @Override
+ public void onMouseDown(final TMouseEvent mouse) {
+ if ((mouseOnUpArrow(mouse)) && (mouse.isMouse1())) {
+ up();
+ } else if ((mouseOnDownArrow(mouse)) && (mouse.isMouse1())) {
+ down();
+ }
+ }
+
+ /**
+ * Handle keystrokes.
+ *
+ * @param keypress keystroke event
+ */
+ @Override
+ public void onKeypress(final TKeypressEvent keypress) {
+ if (keypress.equals(kbUp)) {
+ up();
+ return;
+ }
+ if (keypress.equals(kbDown)) {
+ down();
+ return;
+ }
+
+ // Pass to parent for the things we don't care about.
+ super.onKeypress(keypress);
+ }
+
+ // ------------------------------------------------------------------------
+ // TWidget ----------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Draw the spinner arrows.
+ */
+ @Override
+ public void draw() {
+ CellAttributes spinnerColor;
+
+ if (isAbsoluteActive()) {
+ spinnerColor = getTheme().getColor("tspinner.active");
+ } else {
+ spinnerColor = getTheme().getColor("tspinner.inactive");
+ }
+
+ putCharXY(getWidth() - 2, 0, GraphicsChars.UPARROW, spinnerColor);
+ putCharXY(getWidth() - 1, 0, GraphicsChars.DOWNARROW, spinnerColor);
+ }
+
+ // ------------------------------------------------------------------------
+ // TSpinner ---------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Perform the "up" action.
+ */
+ private void up() {
+ if (upAction != null) {
+ upAction.DO(this);
+ }
+ }
+
+ /**
+ * Perform the "down" action.
+ */
+ private void down() {
+ if (downAction != null) {
+ downAction.DO(this);
+ }
+ }
+
+}