src/frontends/qt4/GuiViewSource.cpp

   1 /**
   2  * \file GuiViewSource.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Bo Peng
   8  * \author Abdelrazak Younes
   9  *
  10  * Full author contact details are available in file CREDITS.
  11  */
  12
  13 #include <config.h>
  14
  15 #include "GuiApplication.h"
  16 #include "GuiViewSource.h"
  17 #include "LaTeXHighlighter.h"
  18 #include "qt_helpers.h"
  19
  20 #include "BufferParams.h"
  21 #include "BufferView.h"
  22 #include "Cursor.h"
  23 #include "Format.h"
  24 #include "Paragraph.h"
  25
  26 #include "support/debug.h"
  27 #include "support/lassert.h"
  28 #include "support/docstream.h"
  29 #include "support/docstring_list.h"
  30 #include "support/gettext.h"
  31
  32 #include <boost/crc.hpp>
  33
  34 #include <QBoxLayout>
  35 #include <QComboBox>
  36 #include <QScrollBar>
  37 #include <QSettings>
  38 #include <QTextCursor>
  39 #include <QTextDocument>
  40 #include <QVariant>
  41
  42 using namespace std;
  43
  44 namespace lyx {
  45 namespace frontend {
  46
  47 ViewSourceWidget::ViewSourceWidget()
  48         :       bv_(0), document_(new QTextDocument(this)),
  49                 highlighter_(new LaTeXHighlighter(document_)),
  50                 update_timer_(new QTimer(this))
  51 {
  52         setupUi(this);
  53
  54         connect(contentsCO, SIGNAL(activated(int)),
  55                 this, SLOT(contentsChanged()));
  56         connect(autoUpdateCB, SIGNAL(toggled(bool)),
  57                 updatePB, SLOT(setDisabled(bool)));
  58         connect(autoUpdateCB, SIGNAL(toggled(bool)),
  59                 this, SLOT(contentsChanged()));
  60         connect(masterPerspectiveCB, SIGNAL(toggled(bool)),
  61                 this, SLOT(contentsChanged()));
  62         connect(updatePB, SIGNAL(clicked()),
  63                 this, SLOT(updateViewNow()));
  64         connect(outputFormatCO, SIGNAL(activated(int)),
  65                 this, SLOT(setViewFormat(int)));
  66         connect(outputFormatCO, SIGNAL(activated(int)),
  67                 this, SLOT(contentsChanged()));
  68 #ifdef DEVEL_VERSION
  69         if (lyx::lyxerr.debugging(Debug::LATEX))
  70                 connect(viewSourceTV, SIGNAL(cursorPositionChanged()),
  71                                 this, SLOT(gotoCursor()));
  72 #endif
  73
  74         // setting the update timer
  75         update_timer_->setSingleShot(true);
  76         connect(update_timer_, SIGNAL(timeout()),
  77                 this, SLOT(realUpdateView()));
  78
  79         // setting a document at this point trigger an assertion in Qt
  80         // so we disable the signals here:
  81         document_->blockSignals(true);
  82         viewSourceTV->setDocument(document_);
  83         // reset selections
  84         setText();
  85         document_->blockSignals(false);
  86         viewSourceTV->setReadOnly(true);
  87         ///dialog_->viewSourceTV->setAcceptRichText(false);
  88         // this is personal. I think source code should be in fixed-size font
  89         viewSourceTV->setFont(guiApp->typewriterSystemFont());
  90         // again, personal taste
  91         viewSourceTV->setWordWrapMode(QTextOption::NoWrap);
  92 }
  93
  94
  95 void ViewSourceWidget::getContent(BufferView const * view,
  96                         Buffer::OutputWhat output, docstring & str, string const & format,
  97                         bool master)
  98 {
  99         // get the *top* level paragraphs that contain the cursor,
 100         // or the selected text
 101         pit_type par_begin;
 102         pit_type par_end;
 103
 104         if (!view->cursor().selection()) {
 105                 par_begin = view->cursor().bottom().pit();
 106                 par_end = par_begin;
 107         } else {
 108                 par_begin = view->cursor().selectionBegin().bottom().pit();
 109                 par_end = view->cursor().selectionEnd().bottom().pit();
 110         }
 111         if (par_begin > par_end)
 112                 swap(par_begin, par_end);
 113         odocstringstream ostr;
 114         texrow_ = view->buffer().getSourceCode(ostr, format,
 115                                                                                 par_begin, par_end + 1, output, master);
 116         //ensure that the last line can always be selected in its full width
 117         str = ostr.str() + "\n";
 118 }
 119
 120
 121 void ViewSourceWidget::setBufferView(BufferView const * bv)
 122 {
 123         if (bv_ != bv) {
 124                 setText();
 125                 bv_ = bv;
 126         }
 127         setEnabled(bv ?  true : false);
 128 }
 129
 130
 131 bool ViewSourceWidget::setText(QString const & qstr)
 132 {
 133         bool const changed = document_->toPlainText() != qstr;
 134         viewSourceTV->setExtraSelections(QList<QTextEdit::ExtraSelection>());
 135         if (changed)
 136                 document_->setPlainText(qstr);
 137         return changed;
 138 }
 139
 140
 141 void ViewSourceWidget::contentsChanged()
 142 {
 143         if (autoUpdateCB->isChecked())
 144                 updateViewNow();
 145 }
 146
 147
 148 void ViewSourceWidget::setViewFormat(int const index)
 149 {
 150         outputFormatCO->setCurrentIndex(index);
 151         view_format_ = outputFormatCO->itemData(index).toString();
 152 }
 153
 154
 155 void ViewSourceWidget::updateView()
 156 {
 157         const int long_delay = 400;
 158         const int short_delay = 60;
 159         // a shorter delay if just the current paragraph is shown
 160         update_timer_->start((contentsCO->currentIndex() == 0) ?
 161                                                 short_delay : long_delay);
 162 }
 163
 164
 165 void ViewSourceWidget::updateViewNow()
 166 {
 167         update_timer_->start(0);
 168 }
 169
 170
 171 void ViewSourceWidget::realUpdateView()
 172 {
 173         if (!bv_) {
 174                 setText();
 175                 setEnabled(false);
 176                 return;
 177         }
 178
 179         setEnabled(true);
 180
 181         // we will try to get that much space around the cursor
 182         int const v_margin = 3;
 183         int const h_margin = 10;
 184         // we will try to preserve this
 185         int const h_scroll = viewSourceTV->horizontalScrollBar()->value();
 186
 187         string const format = fromqstr(view_format_);
 188
 189         Buffer::OutputWhat output = Buffer::CurrentParagraph;
 190         if (contentsCO->currentIndex() == 1)
 191                 output = Buffer::FullSource;
 192         else if (contentsCO->currentIndex() == 2)
 193                 output = Buffer::OnlyPreamble;
 194         else if (contentsCO->currentIndex() == 3)
 195                 output = Buffer::OnlyBody;
 196
 197         docstring content;
 198         getContent(bv_, output, content, format, masterPerspectiveCB->isChecked());
 199         QString old = document_->toPlainText();
 200         QString qcontent = toqstr(content);
 201 #ifdef DEVEL_VERSION
 202         // output tex<->row correspondences in the source panel if the "-dbg latex"
 203         // option is given.
 204         if (texrow_.get() && lyx::lyxerr.debugging(Debug::LATEX)) {
 205                 QStringList list = qcontent.split(QChar('\n'));
 206                 docstring_list dlist;
 207                 for (QStringList::const_iterator it = list.begin(); it != list.end(); ++it)
 208                         dlist.push_back(from_utf8(fromqstr(*it)));
 209                 texrow_->prepend(dlist);
 210                 qcontent.clear();
 211                 for (docstring_list::iterator it = dlist.begin(); it != dlist.end(); ++it)
 212                         qcontent += toqstr(*it) + '\n';
 213         }
 214 #endif
 215         // prevent gotoCursor()
 216         viewSourceTV->blockSignals(true);
 217         bool const changed = setText(qcontent);
 218
 219         if (changed && !texrow_.get()) {
 220                 // position-to-row is unavailable
 221                 // we jump to the first modification
 222                 const QChar * oc = old.constData();
 223                 const QChar * nc = qcontent.constData();
 224                 int pos = 0;
 225                 while (*oc != '\0' && *nc != '\0' && *oc == *nc) {
 226                         ++oc;
 227                         ++nc;
 228                         ++pos;
 229                 }
 230                 QTextCursor c = QTextCursor(viewSourceTV->document());
 231                 //get some space below the cursor
 232                 c.setPosition(pos);
 233                 c.movePosition(QTextCursor::Down, QTextCursor::MoveAnchor,v_margin);
 234                 viewSourceTV->setTextCursor(c);
 235                 //get some space on the right of the cursor
 236                 viewSourceTV->horizontalScrollBar()->setValue(h_scroll);
 237                 c.setPosition(pos);
 238                 const int block = c.blockNumber();
 239                 for (int i = h_margin; i && block == c.blockNumber(); --i) {
 240                         c.movePosition(QTextCursor::Right, QTextCursor::MoveAnchor);
 241                 }
 242                 c.movePosition(QTextCursor::Left, QTextCursor::MoveAnchor);
 243                 viewSourceTV->setTextCursor(c);
 244                 //back to the position
 245                 c.setPosition(pos);
 246                 //c.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor,1);
 247                 viewSourceTV->setTextCursor(c);
 248
 249         } else if (texrow_.get()) {
 250                 // Use the available position-to-row conversion to highlight
 251                 // the current selection in the source
 252                 std::pair<int,int> rows = texrow_->rowFromCursor(bv_->cursor());
 253                 int const beg_row = rows.first;
 254                 int const end_row = rows.second;
 255
 256                 QTextCursor c = QTextCursor(viewSourceTV->document());
 257
 258                 c.movePosition(QTextCursor::NextBlock, QTextCursor::MoveAnchor,
 259                                            beg_row - 1);
 260                 const int beg_sel = c.position();
 261                 //get some space above the cursor
 262                 c.movePosition(QTextCursor::PreviousBlock, QTextCursor::MoveAnchor,
 263                                            v_margin);
 264                 viewSourceTV->setTextCursor(c);
 265                 c.setPosition(beg_sel, QTextCursor::MoveAnchor);
 266
 267                 c.movePosition(QTextCursor::NextBlock, QTextCursor::KeepAnchor,
 268                                            end_row - beg_row +1);
 269                 const int end_sel = c.position();
 270                 //get some space below the cursor
 271                 c.movePosition(QTextCursor::NextBlock, QTextCursor::KeepAnchor,
 272                                            v_margin - 1);
 273                 viewSourceTV->setTextCursor(c);
 274                 c.setPosition(end_sel, QTextCursor::KeepAnchor);
 275
 276                 viewSourceTV->setTextCursor(c);
 277
 278                 //the real highlighting is done with an ExtraSelection
 279                 QTextCharFormat format;
 280                 {
 281                 // We create a new color with the lightness of AlternateBase and
 282                 // the hue and saturation of Highlight
 283                 QPalette palette = viewSourceTV->palette();
 284                 QBrush alt = palette.alternateBase();
 285                 QColor high = palette.highlight().color().toHsl();
 286                 QColor col = QColor::fromHsl(high.hue(),
 287                                              high.hslSaturation(),
 288                                              alt.color().lightness());
 289                 alt.setColor(col);
 290                 format.setBackground(alt);
 291                 }
 292                 format.setProperty(QTextFormat::FullWidthSelection, true);
 293                 QTextEdit::ExtraSelection sel;
 294                 sel.format = format;
 295                 sel.cursor = c;
 296                 viewSourceTV->setExtraSelections(
 297                         QList<QTextEdit::ExtraSelection>() << sel);
 298
 299                 //clean up
 300                 c.clearSelection();
 301                 viewSourceTV->setTextCursor(c);
 302                 viewSourceTV->horizontalScrollBar()->setValue(h_scroll);
 303         } // else if (texrow)
 304         viewSourceTV->blockSignals(false);
 305 }
 306
 307
 308 // only used in DEVEL_MODE for debugging
 309 // need a proper LFUN if we want to implement it in release mode
 310 void ViewSourceWidget::gotoCursor()
 311 {
 312         if (!bv_ || !texrow_.get())
 313                 return;
 314         int row = viewSourceTV->textCursor().blockNumber() + 1;
 315         const_cast<BufferView *>(bv_)->setCursorFromRow(row, *texrow_);
 316 }
 317
 318
 319
 320 void ViewSourceWidget::updateDefaultFormat()
 321 {
 322         if (!bv_)
 323                 return;
 324
 325         outputFormatCO->blockSignals(true);
 326         outputFormatCO->clear();
 327         outputFormatCO->addItem(qt_("Default"),
 328                                 QVariant(QString("default")));
 329
 330         int index = 0;
 331         vector<string> tmp = bv_->buffer().params().backends();
 332         vector<string>::const_iterator it = tmp.begin();
 333         vector<string>::const_iterator en = tmp.end();
 334         for (; it != en; ++it) {
 335                 string const format = *it;
 336                 Format const * fmt = formats.getFormat(format);
 337                 if (!fmt) {
 338                         LYXERR0("Can't find format for backend " << format << "!");
 339                         continue;
 340                 }
 341
 342                 QString const pretty = qt_(fmt->prettyname());
 343                 QString const qformat = toqstr(format);
 344                 outputFormatCO->addItem(pretty, QVariant(qformat));
 345                 if (qformat == view_format_)
 346                    index = outputFormatCO->count() -1;
 347         }
 348         setViewFormat(index);
 349
 350         outputFormatCO->blockSignals(false);
 351 }
 352
 353
 354 void ViewSourceWidget::resizeEvent (QResizeEvent * event)
 355 {
 356         QSize const & formSize = formLayout->sizeHint();
 357         // minimize the size of the part that contains the buttons
 358         if (width() * formSize.height() < height() * formSize.width()) {
 359                 layout_->setDirection(QBoxLayout::TopToBottom);
 360         } else {
 361                 layout_->setDirection(QBoxLayout::LeftToRight);
 362         }
 363         QWidget::resizeEvent(event);
 364 }
 365
 366 void ViewSourceWidget::saveSession(QString const & session_key) const
 367 {
 368         QSettings settings;
 369         settings.setValue(session_key + "/output", view_format_);
 370         settings.setValue(session_key + "/contents", contentsCO->currentIndex());
 371         settings.setValue(session_key + "/autoupdate", autoUpdateCB->isChecked());
 372         settings.setValue(session_key + "/masterview",
 373                                           masterPerspectiveCB->isChecked());
 374 }
 375
 376
 377 void ViewSourceWidget::restoreSession(QString const & session_key)
 378 {
 379         QSettings settings;
 380     view_format_ = settings.value(session_key + "/output", 0).toString();
 381         contentsCO->setCurrentIndex(settings
 382                                                                 .value(session_key + "/contents", 0)
 383                                                                 .toInt());
 384         masterPerspectiveCB->setChecked(settings
 385                                                                         .value(session_key + "/masterview", false)
 386                                                                         .toBool());
 387         bool const checked = settings
 388                 .value(session_key + "/autoupdate", true)
 389                 .toBool();
 390         autoUpdateCB->setChecked(checked);
 391         if (checked)
 392                 updateView();
 393 }
 394
 395
 396 GuiViewSource::GuiViewSource(GuiView & parent,
 397                 Qt::DockWidgetArea area, Qt::WindowFlags flags)
 398         : DockView(parent, "view-source", qt_("LaTeX Source"), area, flags)
 399 {
 400         widget_ = new ViewSourceWidget;
 401         setWidget(widget_);
 402 }
 403
 404
 405 GuiViewSource::~GuiViewSource()
 406 {
 407         delete widget_;
 408 }
 409
 410
 411 void GuiViewSource::updateView()
 412 {
 413         if (widget_->autoUpdateCB->isChecked()) {
 414                 widget_->setBufferView(bufferview());
 415                 widget_->updateView();
 416         }
 417         widget_->masterPerspectiveCB->setEnabled(buffer().parent());
 418 }
 419
 420
 421 void GuiViewSource::enableView(bool enable)
 422 {
 423         widget_->setBufferView(bufferview());
 424         widget_->updateDefaultFormat();
 425         if (!enable)
 426                 // In the opposite case, updateView() will be called anyway.
 427                 widget_->contentsChanged();
 428 }
 429
 430
 431 bool GuiViewSource::initialiseParams(string const & /*source*/)
 432 {
 433         setWindowTitle(title());
 434         return true;
 435 }
 436
 437
 438 QString GuiViewSource::title() const
 439 {
 440         switch (docType()) {
 441                 case LATEX:
 442                         //FIXME: this is shown for LyXHTML source, LyX source, etc.
 443                         return qt_("LaTeX Source");
 444                 case DOCBOOK:
 445                         return qt_("DocBook Source");
 446                 case LITERATE:
 447                         return qt_("Literate Source");
 448         }
 449         LATTEST(false);
 450         return QString();
 451 }
 452
 453
 454 void GuiViewSource::saveSession() const
 455 {
 456         Dialog::saveSession();
 457         widget_->saveSession(sessionKey());
 458 }
 459
 460
 461 void GuiViewSource::restoreSession()
 462 {
 463         DockView::restoreSession();
 464         widget_->restoreSession(sessionKey());
 465 }
 466
 467
 468 Dialog * createGuiViewSource(GuiView & lv)
 469 {
 470         return new GuiViewSource(lv);
 471 }
 472
 473
 474 } // namespace frontend
 475 } // namespace lyx
 476
 477 #include "moc_GuiViewSource.cpp"