src/be/nikiroo/fanfix/reader/ui/GuiReaderNavBar.java

   1 package be.nikiroo.fanfix.reader.ui;
   2
   3 import java.awt.Color;
   4 import java.awt.LayoutManager;
   5 import java.awt.event.ActionEvent;
   6 import java.awt.event.ActionListener;
   7 import java.util.ArrayList;
   8 import java.util.List;
   9
  10 import javax.swing.BoxLayout;
  11 import javax.swing.JButton;
  12 import javax.swing.JLabel;
  13 import javax.swing.JPanel;
  14
  15 import be.nikiroo.fanfix.Instance;
  16
  17 /**
  18  * A Swing-based navigation bar, that displays first/previous/next/last page
  19  * buttons.
  20  *
  21  * @author niki
  22  */
  23 public class GuiReaderNavBar extends JPanel {
  24         private static final long serialVersionUID = 1L;
  25
  26         private JLabel label;
  27         private int index = 0;
  28         private int min = 0;
  29         private int max = 0;
  30         private JButton[] navButtons;
  31         String extraLabel = null;
  32
  33         private List<ActionListener> listeners = new ArrayList<ActionListener>();
  34
  35         /**
  36          * Create a new navigation bar.
  37          * <p>
  38          * The minimum must be lower or equal to the maximum.
  39          * <p>
  40          * Note than a max of "-1" means "infinite".
  41          *
  42          * @param min
  43          *            the minimum page number (cannot be negative)
  44          * @param max
  45          *            the maximum page number (cannot be lower than min, except if
  46          *            -1 (infinite))
  47          *
  48          * @throws IndexOutOfBoundsException
  49          *             if min &gt; max and max is not "-1"
  50          */
  51         public GuiReaderNavBar(int min, int max) {
  52                 if (min > max && max != -1) {
  53                         throw new IndexOutOfBoundsException(String.format(
  54                                         "min (%d) > max (%d)", min, max));
  55                 }
  56
  57                 LayoutManager layout = new BoxLayout(this, BoxLayout.X_AXIS);
  58                 setLayout(layout);
  59
  60                 // TODO:
  61                 // JButton up = new BasicArrowButton(BasicArrowButton.NORTH);
  62                 // JButton down = new BasicArrowButton(BasicArrowButton.SOUTH);
  63
  64                 navButtons = new JButton[4];
  65
  66                 navButtons[0] = createNavButton("<<", new ActionListener() {
  67                         @Override
  68                         public void actionPerformed(ActionEvent e) {
  69                                 setIndex(GuiReaderNavBar.this.min);
  70                                 fireEvent();
  71                         }
  72                 });
  73                 navButtons[1] = createNavButton(" < ", new ActionListener() {
  74                         @Override
  75                         public void actionPerformed(ActionEvent e) {
  76                                 setIndex(index - 1);
  77                                 fireEvent();
  78                         }
  79                 });
  80                 navButtons[2] = createNavButton(" > ", new ActionListener() {
  81                         @Override
  82                         public void actionPerformed(ActionEvent e) {
  83                                 setIndex(index + 1);
  84                                 fireEvent();
  85                         }
  86                 });
  87                 navButtons[3] = createNavButton(">>", new ActionListener() {
  88                         @Override
  89                         public void actionPerformed(ActionEvent e) {
  90                                 setIndex(GuiReaderNavBar.this.max);
  91                                 fireEvent();
  92                         }
  93                 });
  94
  95                 for (JButton navButton : navButtons) {
  96                         add(navButton);
  97                 }
  98
  99                 label = new JLabel("");
 100                 add(label);
 101
 102                 this.min = min;
 103                 this.max = max;
 104                 this.index = min;
 105
 106                 updateEnabled();
 107                 updateLabel();
 108                 fireEvent();
 109         }
 110
 111         /**
 112          * The current index, must be between {@link GuiReaderNavBar#min} and
 113          * {@link GuiReaderNavBar#max}, both inclusive.
 114          *
 115          * @return the index
 116          */
 117         public int getIndex() {
 118                 return index;
 119         }
 120
 121         /**
 122          * The current index, must be between {@link GuiReaderNavBar#min} and
 123          * {@link GuiReaderNavBar#max}, both inclusive.
 124          *
 125          * @param index
 126          *            the new index
 127          */
 128         public void setIndex(int index) {
 129                 if (index != this.index) {
 130                         if (index < min || (index > max && max != -1)) {
 131                                 throw new IndexOutOfBoundsException(String.format(
 132                                                 "Index %d but min/max is [%d/%d]", index, min, max));
 133                         }
 134
 135                         this.index = index;
 136                         updateLabel();
 137                 }
 138
 139                 updateEnabled();
 140         }
 141
 142         /**
 143          * The minimun page number. Cannot be negative.
 144          *
 145          * @return the min
 146          */
 147         public int getMin() {
 148                 return min;
 149         }
 150
 151         /**
 152          * The minimum page number. Cannot be negative.
 153          * <p>
 154          * May update the index if needed (if the index is &lt; the new min).
 155          * <p>
 156          * Will also (always) update the label and enable/disable the required
 157          * buttons.
 158          *
 159          * @param min
 160          *            the new min
 161          */
 162         public void setMin(int min) {
 163                 this.min = min;
 164                 if (index < min) {
 165                         index = min;
 166                 }
 167                 updateEnabled();
 168                 updateLabel();
 169
 170         }
 171
 172         /**
 173          * The maximum page number. Cannot be lower than min, except if -1
 174          * (infinite).
 175          *
 176          * @return the max
 177          */
 178         public int getMax() {
 179                 return max;
 180         }
 181
 182         /**
 183          * The maximum page number. Cannot be lower than min, except if -1
 184          * (infinite).
 185          * <p>
 186          * May update the index if needed (if the index is &gt; the new max).
 187          * <p>
 188          * Will also (always) update the label and enable/disable the required
 189          * buttons.
 190          *
 191          * @param max
 192          *            the new max
 193          */
 194         public void setMax(int max) {
 195                 this.max = max;
 196                 if (index > max && max != -1) {
 197                         index = max;
 198                 }
 199                 updateEnabled();
 200                 updateLabel();
 201         }
 202
 203         /**
 204          * The current extra label to display with the default
 205          * {@link GuiReaderNavBar#computeLabel(int, int, int)} implementation.
 206          *
 207          * @return the current label
 208          */
 209         public String getExtraLabel() {
 210                 return extraLabel;
 211         }
 212
 213         /**
 214          * The current extra label to display with the default
 215          * {@link GuiReaderNavBar#computeLabel(int, int, int)} implementation.
 216          *
 217          * @param currentLabel
 218          *            the new current label
 219          */
 220         public void setExtraLabel(String currentLabel) {
 221                 this.extraLabel = currentLabel;
 222                 updateLabel();
 223         }
 224
 225         /**
 226          * Add a listener that will be called on each page change.
 227          *
 228          * @param listener
 229          *            the new listener
 230          */
 231         public void addActionListener(ActionListener listener) {
 232                 listeners.add(listener);
 233         }
 234
 235         /**
 236          * Remove the given listener if possible.
 237          *
 238          * @param listener
 239          *            the listener to remove
 240          * @return TRUE if it was removed, FALSE if it was not found
 241          */
 242         public boolean removeActionListener(ActionListener listener) {
 243                 return listeners.remove(listener);
 244         }
 245
 246         /**
 247          * Remove all the listeners.
 248          */
 249         public void clearActionsListeners() {
 250                 listeners.clear();
 251         }
 252
 253         /**
 254          * Notify a change of page.
 255          */
 256         public void fireEvent() {
 257                 for (ActionListener listener : listeners) {
 258                         try {
 259                                 listener.actionPerformed(new ActionEvent(this,
 260                                                 ActionEvent.ACTION_FIRST, "page changed"));
 261                         } catch (Exception e) {
 262                                 Instance.getInstance().getTraceHandler().error(e);
 263                         }
 264                 }
 265         }
 266
 267         /**
 268          * Create a single navigation button.
 269          *
 270          * @param text
 271          *            the text to display
 272          * @param action
 273          *            the action to take on click
 274          * @return the button
 275          */
 276         private JButton createNavButton(String text, ActionListener action) {
 277                 JButton navButton = new JButton(text);
 278                 navButton.addActionListener(action);
 279                 navButton.setForeground(Color.BLUE);
 280                 return navButton;
 281         }
 282
 283         /**
 284          * Update the label displayed in the UI.
 285          */
 286         private void updateLabel() {
 287                 label.setText(computeLabel(index, min, max));
 288         }
 289
 290         /**
 291          * Update the navigation buttons "enabled" state according to the current
 292          * index value.
 293          */
 294         private void updateEnabled() {
 295                 navButtons[0].setEnabled(index > min);
 296                 navButtons[1].setEnabled(index > min);
 297                 navButtons[2].setEnabled(index < max || max == -1);
 298                 navButtons[3].setEnabled(index < max || max == -1);
 299         }
 300
 301         /**
 302          * Return the label to display for the given index.
 303          * <p>
 304          * Swing HTML (HTML3) is supported if surrounded by &lt;HTML&gt; and
 305          * &lt;/HTML&gt;.
 306          * <p>
 307          * By default, return "Page 1/5: current_label" (with the current index and
 308          * {@link GuiReaderNavBar#getCurrentLabel()}).
 309          *
 310          * @param index
 311          *            the new index number
 312          * @param mix
 313          *            the minimum index (inclusive)
 314          * @param max
 315          *            the maximum index (inclusive)
 316          * @return the label
 317          */
 318         protected String computeLabel(int index,
 319                         @SuppressWarnings("unused") int min, int max) {
 320
 321                 String base = "&nbsp;&nbsp;<B>Page <SPAN COLOR='#444466'>%d</SPAN>&nbsp;";
 322                 if (max >= 0) {
 323                         base += "/&nbsp;%d";
 324                 }
 325                 base += "</B>";
 326
 327                 String ifLabel = ": %s";
 328
 329                 String display = base;
 330                 String label = getExtraLabel();
 331                 if (label != null && !label.trim().isEmpty()) {
 332                         display += ifLabel;
 333                 }
 334
 335                 display = "<HTML>" + display + "</HTML>";
 336
 337                 if (max >= 0) {
 338                         return String.format(display, index, max, label);
 339                 }
 340
 341                 return String.format(display, index, label);
 342         }
 343 }