src/jexer/TRadioButton.java

   1 /*
   2  * Jexer - Java Text User Interface
   3  *
   4  * The MIT License (MIT)
   5  *
   6  * Copyright (C) 2017 Kevin Lamonte
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24  * DEALINGS IN THE SOFTWARE.
  25  *
  26  * @author Kevin Lamonte [kevin.lamonte@gmail.com]
  27  * @version 1
  28  */
  29 package jexer;
  30
  31 import jexer.bits.CellAttributes;
  32 import jexer.bits.GraphicsChars;
  33 import jexer.event.TKeypressEvent;
  34 import jexer.event.TMouseEvent;
  35 import static jexer.TKeypress.*;
  36
  37 /**
  38  * TRadioButton implements a selectable radio button.
  39  */
  40 public final class TRadioButton extends TWidget {
  41
  42     /**
  43      * RadioButton state, true means selected.
  44      */
  45     private boolean selected = false;
  46
  47     /**
  48      * Get RadioButton state, true means selected.
  49      *
  50      * @return if true then this is the one button in the group that is
  51      * selected
  52      */
  53     public boolean isSelected() {
  54         return selected;
  55     }
  56
  57     /**
  58      * Set RadioButton state, true means selected.  Note package private
  59      * access.
  60      *
  61      * @param selected if true then this is the one button in the group that
  62      * is selected
  63      */
  64     void setSelected(final boolean selected) {
  65         this.selected = selected;
  66     }
  67
  68     /**
  69      * Label for this radio button.
  70      */
  71     private String label;
  72
  73     /**
  74      * ID for this radio button.  Buttons start counting at 1 in the
  75      * RadioGroup.
  76      */
  77     private int id;
  78
  79     /**
  80      * Get ID for this radio button.  Buttons start counting at 1 in the
  81      * RadioGroup.
  82      *
  83      * @return the ID
  84      */
  85     public int getId() {
  86         return id;
  87     }
  88
  89     /**
  90      * Public constructor.
  91      *
  92      * @param parent parent widget
  93      * @param x column relative to parent
  94      * @param y row relative to parent
  95      * @param label label to display next to (right of) the radiobutton
  96      * @param id ID for this radio button
  97      */
  98     public TRadioButton(final TRadioGroup parent, final int x, final int y,
  99         final String label, final int id) {
 100
 101         // Set parent and window
 102         super(parent, x, y, label.length() + 4, 1);
 103
 104         this.label = label;
 105         this.id = id;
 106
 107         setCursorVisible(true);
 108         setCursorX(1);
 109     }
 110
 111     /**
 112      * Returns true if the mouse is currently on the radio button.
 113      *
 114      * @param mouse mouse event
 115      * @return if true the mouse is currently on the radio button
 116      */
 117     private boolean mouseOnRadioButton(final TMouseEvent mouse) {
 118         if ((mouse.getY() == 0)
 119             && (mouse.getX() >= 0)
 120             && (mouse.getX() <= 2)
 121         ) {
 122             return true;
 123         }
 124         return false;
 125     }
 126
 127     /**
 128      * Draw a radio button with label.
 129      */
 130     @Override
 131     public void draw() {
 132         CellAttributes radioButtonColor;
 133
 134         if (isAbsoluteActive()) {
 135             radioButtonColor = getTheme().getColor("tradiobutton.active");
 136         } else {
 137             radioButtonColor = getTheme().getColor("tradiobutton.inactive");
 138         }
 139
 140         getScreen().putCharXY(0, 0, '(', radioButtonColor);
 141         if (selected) {
 142             getScreen().putCharXY(1, 0, GraphicsChars.CP437[0x07],
 143                 radioButtonColor);
 144         } else {
 145             getScreen().putCharXY(1, 0, ' ', radioButtonColor);
 146         }
 147         getScreen().putCharXY(2, 0, ')', radioButtonColor);
 148         getScreen().putStringXY(4, 0, label, radioButtonColor);
 149     }
 150
 151     /**
 152      * Handle mouse button presses.
 153      *
 154      * @param mouse mouse button press event
 155      */
 156     @Override
 157     public void onMouseDown(final TMouseEvent mouse) {
 158         if ((mouseOnRadioButton(mouse)) && (mouse.isMouse1())) {
 159             // Switch state
 160             selected = !selected;
 161             if (selected) {
 162                 ((TRadioGroup) getParent()).setSelected(this);
 163             }
 164         }
 165     }
 166
 167     /**
 168      * Handle keystrokes.
 169      *
 170      * @param keypress keystroke event
 171      */
 172     @Override
 173     public void onKeypress(final TKeypressEvent keypress) {
 174
 175         if (keypress.equals(kbSpace)) {
 176             selected = !selected;
 177             if (selected) {
 178                 ((TRadioGroup) getParent()).setSelected(this);
 179             }
 180             return;
 181         }
 182
 183         // Pass to parent for the things we don't care about.
 184         super.onKeypress(keypress);
 185     }
 186
 187 }