radio buttons

[fanfix.git] / src / jexer / TRadioGroup.java

diff --git a/src/jexer/TRadioGroup.java b/src/jexer/TRadioGroup.java
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+++ b/src/jexer/TRadioGroup.java
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+/**
+ * Jexer - Java Text User Interface
+ *
+ * License: LGPLv3 or later
+ *
+ * This module is licensed under the GNU Lesser General Public License
+ * Version 3.  Please see the file "COPYING" in this directory for more
+ * information about the GNU Lesser General Public License Version 3.
+ *
+ *     Copyright (C) 2015  Kevin Lamonte
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see
+ * http://www.gnu.org/licenses/, or write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ * @author Kevin Lamonte [kevin.lamonte@gmail.com]
+ * @version 1
+ */
+package jexer;
+
+import jexer.bits.CellAttributes;
+
+/**
+ * TRadioGroup is a collection of TRadioButtons with a box and label.
+ */
+public final class TRadioGroup extends TWidget {
+
+    /**
+     * Label for this radio button group.
+     */
+    private String label;
+
+    /**
+     * Only one of my children can be selected.
+     */
+    private TRadioButton selectedButton = null;
+
+    /**
+     * Get the radio button ID that was selected.
+     *
+     * @return ID of the selected button, or 0 if no button is selected
+     */
+    public int getSelected() {
+        if (selectedButton == null) {
+            return 0;
+        }
+        return selectedButton.getId();
+    }
+
+    /**
+     * Set the new selected radio button.  Note package private access.
+     *
+     * @param button new button that became selected
+     */
+    void setSelected(final TRadioButton button) {
+        assert (button.getSelected());
+        if (selectedButton != null) {
+            selectedButton.setSelected(false);
+        }
+        selectedButton = button;
+    }
+
+    /**
+     * Public constructor.
+     *
+     * @param parent parent widget
+     * @param x column relative to parent
+     * @param y row relative to parent
+     * @param label label to display on the group box
+     */
+    public TRadioGroup(final TWidget parent, final int x, final int y,
+        final String label) {
+
+        // Set parent and window
+        super(parent);
+
+        setX(x);
+        setY(y);
+        setHeight(2);
+        this.label = label;
+        setWidth(label.length() + 4);
+    }
+
+    /**
+     * Draw a radio button with label.
+     */
+    @Override
+    public void draw() {
+        CellAttributes radioGroupColor;
+
+        if (getAbsoluteActive()) {
+            radioGroupColor = getTheme().getColor("tradiogroup.active");
+        } else {
+            radioGroupColor = getTheme().getColor("tradiogroup.inactive");
+        }
+
+        getScreen().drawBox(0, 0, getWidth(), getHeight(),
+            radioGroupColor, radioGroupColor, 3, false);
+
+        getScreen().hLineXY(1, 0, label.length() + 2, ' ', radioGroupColor);
+        getScreen().putStrXY(2, 0, label, radioGroupColor);
+    }
+
+    /**
+     * Convenience function to add a radio button to this group.
+     *
+     * @param label label to display next to (right of) the radiobutton
+     * @return the new radio button
+     */
+    public TRadioButton addRadioButton(final String label) {
+        int buttonX = 1;
+        int buttonY = getChildren().size() + 1;
+        if (label.length() + 4 > getWidth()) {
+            setWidth(label.length() + 7);
+        }
+        setHeight(getChildren().size() + 3);
+        return new TRadioButton(this, buttonX, buttonY, label,
+            getChildren().size() + 1);
+    }
+
+}