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

   1 package be.nikiroo.fanfix.reader.ui;
   2
   3 import java.awt.BorderLayout;
   4 import java.awt.EventQueue;
   5 import java.awt.Graphics2D;
   6 import java.awt.event.ActionEvent;
   7 import java.awt.event.ActionListener;
   8 import java.awt.image.BufferedImage;
   9
  10 import javax.swing.Icon;
  11 import javax.swing.ImageIcon;
  12 import javax.swing.JButton;
  13 import javax.swing.JEditorPane;
  14 import javax.swing.JLabel;
  15 import javax.swing.JPanel;
  16 import javax.swing.JProgressBar;
  17 import javax.swing.JScrollPane;
  18 import javax.swing.SwingConstants;
  19
  20 import be.nikiroo.fanfix.Instance;
  21 import be.nikiroo.fanfix.bundles.StringIdGui;
  22 import be.nikiroo.fanfix.data.Chapter;
  23 import be.nikiroo.fanfix.data.Story;
  24 import be.nikiroo.utils.Image;
  25 import be.nikiroo.utils.ui.ImageUtilsAwt;
  26
  27 /**
  28  * A {@link JPanel} that will show a {@link Story} chapter on screen.
  29  *
  30  * @author niki
  31  */
  32 public class GuiReaderViewerPanel extends JPanel {
  33         private static final long serialVersionUID = 1L;
  34
  35         private boolean imageDocument;
  36         private Chapter chap;
  37         private JScrollPane scroll;
  38         private GuiReaderViewerTextOutput htmlOutput;
  39
  40         // text only:
  41         private JEditorPane text;
  42
  43         // image only:
  44         private JLabel image;
  45         private JProgressBar imageProgress;
  46         private int currentImage;
  47         private JButton left;
  48         private JButton right;
  49
  50         /**
  51          * Create a new viewer.
  52          *
  53          * @param story
  54          *            the {@link Story} to work on.
  55          */
  56         public GuiReaderViewerPanel(Story story) {
  57                 super(new BorderLayout());
  58
  59                 this.imageDocument = story.getMeta().isImageDocument();
  60
  61                 this.text = new JEditorPane("text/html", "");
  62                 text.setAlignmentY(TOP_ALIGNMENT);
  63                 htmlOutput = new GuiReaderViewerTextOutput();
  64
  65                 image = new JLabel();
  66                 image.setHorizontalAlignment(SwingConstants.CENTER);
  67
  68                 scroll = new JScrollPane(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
  69                                 JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
  70                 scroll.getVerticalScrollBar().setUnitIncrement(16);
  71
  72                 if (!imageDocument) {
  73                         add(scroll, BorderLayout.CENTER);
  74                 } else {
  75                         imageProgress = new JProgressBar();
  76                         imageProgress.setStringPainted(true);
  77                         add(imageProgress, BorderLayout.SOUTH);
  78
  79                         JPanel main = new JPanel(new BorderLayout());
  80                         main.add(scroll, BorderLayout.CENTER);
  81
  82                         left = new JButton("<HTML>&nbsp; &nbsp; &lt; &nbsp; &nbsp;</HTML>");
  83                         left.addActionListener(new ActionListener() {
  84                                 @Override
  85                                 public void actionPerformed(ActionEvent e) {
  86                                         setImage(--currentImage);
  87                                 }
  88                         });
  89                         main.add(left, BorderLayout.WEST);
  90
  91                         right = new JButton("<HTML>&nbsp; &nbsp; &gt; &nbsp; &nbsp;</HTML>");
  92                         right.addActionListener(new ActionListener() {
  93                                 @Override
  94                                 public void actionPerformed(ActionEvent e) {
  95                                         setImage(++currentImage);
  96                                 }
  97                         });
  98                         main.add(right, BorderLayout.EAST);
  99
 100                         add(main, BorderLayout.CENTER);
 101                         main.invalidate();
 102                 }
 103
 104                 setChapter(story.getMeta().getResume());
 105         }
 106
 107         /**
 108          * Load the given chapter.
 109          * <p>
 110          * Will always be text for a non-image document.
 111          * <p>
 112          * Will be an image and left/right controls for an image-document, except
 113          * for chapter 0 which will be text (chapter 0 = resume).
 114          *
 115          * @param chap
 116          *            the chapter to load
 117          */
 118         public void setChapter(Chapter chap) {
 119                 this.chap = chap;
 120
 121                 if (!imageDocument) {
 122                         setText(chap);
 123                 } else {
 124                         left.setVisible(chap.getNumber() > 0);
 125                         right.setVisible(chap.getNumber() > 0);
 126                         imageProgress.setVisible(chap.getNumber() > 0);
 127
 128                         imageProgress.setMinimum(0);
 129                         imageProgress.setMaximum(chap.getParagraphs().size() - 1);
 130
 131                         if (chap.getNumber() == 0) {
 132                                 setText(chap);
 133                         } else {
 134                                 setImage(0);
 135                         }
 136                 }
 137         }
 138
 139         /**
 140          * Will set and display the current chapter text.
 141          *
 142          * @param chap
 143          *            the chapter to display
 144          */
 145         private void setText(final Chapter chap) {
 146                 new Thread(new Runnable() {
 147                         @Override
 148                         public void run() {
 149                                 final String content = htmlOutput.convert(chap);
 150                                 // Wait until size computations are correct
 151                                 while (!scroll.isValid()) {
 152                                         try {
 153                                                 Thread.sleep(1);
 154                                         } catch (InterruptedException e) {
 155                                         }
 156                                 }
 157
 158                                 setText(content);
 159                         }
 160                 }).start();
 161         }
 162
 163         /**
 164          * Actually set the text in the UI.
 165          * <p>
 166          * Do <b>NOT</b> use this method from the UI thread.
 167          *
 168          * @param content
 169          *            the text
 170          */
 171         private void setText(final String content) {
 172                 EventQueue.invokeLater(new Runnable() {
 173                         @Override
 174                         public void run() {
 175                                 text.setText(content);
 176                                 text.setCaretPosition(0);
 177                                 scroll.setViewportView(text);
 178                         }
 179                 });
 180         }
 181
 182         /**
 183          * Will set and display the current image, take care about the progression
 184          * and update the left and right cursors' <tt>enabled</tt> property.
 185          *
 186          * @param i
 187          *            the image index to load
 188          */
 189         private void setImage(int i) {
 190                 left.setEnabled(i > 0);
 191                 right.setEnabled(i + 1 < chap.getParagraphs().size());
 192
 193                 if (i < 0 || i >= chap.getParagraphs().size()) {
 194                         return;
 195                 }
 196
 197                 imageProgress.setValue(i);
 198                 imageProgress.setString(GuiReader.trans(StringIdGui.IMAGE_PROGRESSION,
 199                                 i + 1, chap.getParagraphs().size()));
 200
 201                 currentImage = i;
 202
 203                 final Image img = chap.getParagraphs().get(i).getContentImage();
 204
 205                 // prepare the viewport to get the right sizes later on
 206                 image.setIcon(null);
 207                 scroll.setViewportView(image);
 208
 209                 new Thread(new Runnable() {
 210                         @Override
 211                         public void run() {
 212                                 // Wait until size computations are correct
 213                                 while (!scroll.isValid()) {
 214                                         try {
 215                                                 Thread.sleep(1);
 216                                         } catch (InterruptedException e) {
 217                                         }
 218                                 }
 219
 220                                 if (img == null) {
 221                                         setText("Error: cannot render image.");
 222                                 } else {
 223                                         setImage(img);
 224                                 }
 225                         }
 226                 }).start();
 227         }
 228
 229         /**
 230          * Actually set the image in the UI.
 231          * <p>
 232          * Do <b>NOT</b> use this method from the UI thread.
 233          *
 234          * @param img
 235          *            the image to set
 236          */
 237         private void setImage(Image img) {
 238                 try {
 239                         int scrollWidth = scroll.getWidth()
 240                                         - scroll.getVerticalScrollBar().getWidth();
 241
 242                         BufferedImage buffImg = ImageUtilsAwt.fromImage(img);
 243
 244                         int iw = buffImg.getWidth();
 245                         int ih = buffImg.getHeight();
 246                         double ratio = ((double) ih) / iw;
 247
 248                         int w = scrollWidth;
 249                         int h = (int) (ratio * scrollWidth);
 250
 251                         BufferedImage resizedImage = new BufferedImage(w, h,
 252                                         BufferedImage.TYPE_4BYTE_ABGR);
 253
 254                         Graphics2D g = resizedImage.createGraphics();
 255                         try {
 256                                 g.drawImage(buffImg, 0, 0, w, h, null);
 257                         } finally {
 258                                 g.dispose();
 259                         }
 260
 261                         final Icon icon = new ImageIcon(resizedImage);
 262                         EventQueue.invokeLater(new Runnable() {
 263                                 @Override
 264                                 public void run() {
 265                                         image.setIcon(icon);
 266                                         scroll.setViewportView(image);
 267                                 }
 268                         });
 269                 } catch (Exception e) {
 270                         Instance.getTraceHandler().error(
 271                                         new Exception("Failed to load image into label", e));
 272                         EventQueue.invokeLater(new Runnable() {
 273                                 @Override
 274                                 public void run() {
 275                                         text.setText("Error: cannot load image.");
 276                                 }
 277                         });
 278                 }
 279         }
 280 }