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1 /**
2  * \file TocWidget.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 Abdelrazak Younes
8  *
9  * Full author contact details are available in file CREDITS.
10  */
11
12 #include <config.h>
13
14 #include "TocWidget.h"
15
16 #include "GuiApplication.h"
17 #include "GuiView.h"
18 #include "qt_helpers.h"
19 #include "TocModel.h"
20 #include "FancyLineEdit.h"
21
22 #include "Buffer.h"
23 #include "BufferView.h"
24 #include "Cursor.h"
25 #include "CutAndPaste.h"
26 #include "FuncRequest.h"
27 #include "FuncStatus.h"
28 #include "LyX.h"
29 #include "Menus.h"
30 #include "TocBackend.h"
31
32 #include "insets/InsetCommand.h"
33 #include "insets/InsetRef.h"
34
35 #include "support/debug.h"
36 #include "support/lassert.h"
37
38 #include <QHeaderView>
39 #include <QMenu>
40 #include <QTimer>
41
42 #include <vector>
43
44 using namespace std;
45
46 namespace lyx {
47 namespace frontend {
48
49 TocWidget::TocWidget(GuiView & gui_view, QWidget * parent)
50         : QWidget(parent), depth_(0), persistent_(false), keep_expanded_(false),
51           gui_view_(gui_view), timer_(new QTimer(this))
52 {
53         setupUi(this);
54
55         moveOutTB->setIcon(QIcon(getPixmap("images/", "outline-out", "svgz,png")));
56         moveInTB->setIcon(QIcon(getPixmap("images/", "outline-in", "svgz,png")));
57         moveUpTB->setIcon(QIcon(getPixmap("images/", "outline-up", "svgz,png")));
58         moveDownTB->setIcon(QIcon(getPixmap("images/", "outline-down", "svgz,png")));
59         updateTB->setIcon(QIcon(getPixmap("images/", "reload", "svgz,png")));
60
61         QSize icon_size = gui_view.iconSize();
62         moveOutTB->setIconSize(icon_size);
63         moveInTB->setIconSize(icon_size);
64         moveUpTB->setIconSize(icon_size);
65         moveDownTB->setIconSize(icon_size);
66         updateTB->setIconSize(icon_size);
67
68         // avoid flickering
69         tocTV->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
70
71         tocTV->showColumn(0);
72
73         // hide the pointless QHeader for now
74         // in the future, new columns may appear
75         // like labels, bookmarks, etc...
76         // tocTV->header()->hide();
77         tocTV->header()->setVisible(false);
78
79         // Only one item selected at a time.
80         tocTV->setSelectionMode(QAbstractItemView::SingleSelection);
81
82         // The toc types combo won't change its model.
83         typeCO->setModel(gui_view_.tocModels().nameModel());
84
85         // The filter bar
86         filter_ = new FancyLineEdit(this);
87         filter_->setClearButton(true);
88         filter_->setPlaceholderText(qt_("All items"));
89         filterBarL->addWidget(filter_, 0);
90         filterLA->setBuddy(filter_);
91         setFocusProxy(filter_);
92
93         // Make sure the buttons are disabled when first shown without a loaded
94         // Buffer.
95         enableControls(false);
96
97         // make us responsible for the context menu of the tabbar
98         setContextMenuPolicy(Qt::CustomContextMenu);
99         connect(this, SIGNAL(customContextMenuRequested(const QPoint &)),
100                 this, SLOT(showContextMenu(const QPoint &)));
101         connect(tocTV, SIGNAL(customContextMenuRequested(const QPoint &)),
102                 this, SLOT(showContextMenu(const QPoint &)));
103         connect(filter_, SIGNAL(textEdited(QString)),
104                 this, SLOT(filterContents()));
105         connect(filter_, &FancyLineEdit::downPressed,
106                 tocTV, [this](){ focusAndHighlight(tocTV); });
107         connect(activeFilterCO, SIGNAL(activated(int)),
108                 this, SLOT(filterContents()));
109
110         // setting the update timer
111         timer_->setSingleShot(true);
112         connect(timer_, SIGNAL(timeout()), this, SLOT(finishUpdateView()));
113
114         init(QString());
115 }
116
117
118 void TocWidget::showContextMenu(const QPoint & pos)
119 {
120         std::string name = "context-toc-" + fromqstr(current_type_);
121         QMenu * menu = guiApp->menus().menu(toqstr(name), gui_view_);
122         if (!menu)
123                 return;
124         menu->exec(mapToGlobal(pos));
125 }
126
127
128 Inset * TocWidget::itemInset() const
129 {
130         QModelIndex const & index = tocTV->currentIndex();
131         TocItem const & item =
132                 gui_view_.tocModels().currentItem(current_type_, index);
133         DocIterator const & dit = item.dit();
134
135         Inset * inset = nullptr;
136         if (current_type_ == "label"
137                   || current_type_ == "graphics"
138                   || current_type_ == "citation"
139                   || current_type_ == "child")
140                 inset = dit.nextInset();
141
142         else if (current_type_ == "branch"
143                          || current_type_ == "index"
144                          || current_type_ == "change"
145                          || current_type_ == "table"
146                      || current_type_ == "listing"
147                      || current_type_ == "figure")
148                 inset = &dit.inset();
149
150         return inset;
151 }
152
153
154 bool TocWidget::getStatus(Cursor & cur, FuncRequest const & cmd,
155         FuncStatus & status) const
156 {
157         Inset * inset = itemInset();
158         FuncRequest tmpcmd(cmd);
159
160         QModelIndex const & index = tocTV->currentIndex();
161         TocItem const & item =
162                 gui_view_.tocModels().currentItem(current_type_, index);
163
164         switch (cmd.action())
165         {
166         case LFUN_CHANGE_ACCEPT:
167         case LFUN_CHANGE_REJECT:
168         case LFUN_OUTLINE_UP:
169         case LFUN_OUTLINE_DOWN:
170         case LFUN_OUTLINE_IN:
171         case LFUN_OUTLINE_OUT:
172         case LFUN_SECTION_SELECT:
173                 status.setEnabled((bool)item.dit());
174                 return true;
175
176         case LFUN_LABEL_COPY_AS_REFERENCE: {
177                 // For labels in math, we need to supply the label as a string
178                 FuncRequest label_copy(LFUN_LABEL_COPY_AS_REFERENCE, item.str());
179                 if (inset)
180                         return inset->getStatus(cur, label_copy, status);
181                 break;
182         }
183
184         default:
185                 if (inset)
186                         return inset->getStatus(cur, tmpcmd, status);
187         }
188
189         return false;
190 }
191
192
193 void TocWidget::doDispatch(Cursor & cur, FuncRequest const & cmd,
194                 DispatchResult & dr)
195 {
196
197         Inset * inset = itemInset();
198
199         QModelIndex const & index = tocTV->currentIndex();
200         TocItem const & item =
201                 gui_view_.tocModels().currentItem(current_type_, index);
202
203         // Start an undo group.
204         cur.beginUndoGroup();
205
206         switch (cmd.action())
207         {
208         case LFUN_CHANGE_ACCEPT:
209         case LFUN_CHANGE_REJECT: {
210                 // The action is almost always LYX_UNKNOWN_ACTION, which will
211                 // have the effect of moving the cursor to the location of
212                 // the change. (See TocItem::action.)
213                 dispatch(item.action());
214                 // If we do not reset the origin, then the request will be sent back
215                 // here, and we are in an infinite loop. But we need the dispatch
216                 // machinery to clean up for us, if the cursor is in an inset that
217                 // will be deleted. See bug #10316.
218                 FuncRequest tmpcmd(cmd);
219                 tmpcmd.setOrigin(FuncRequest::INTERNAL);
220                 dispatch(tmpcmd);
221                 dr.forceBufferUpdate();
222                 break;
223         }
224
225         case LFUN_SECTION_SELECT:
226                 dispatch(item.action());
227                 cur.dispatch(cmd);
228                 // necessary to get the selection drawn.
229                 cur.buffer()->changed(true);
230                 gui_view_.setFocus();
231                 break;
232
233         case LFUN_LABEL_COPY_AS_REFERENCE: {
234                 // For labels in math, we need to supply the label as a string
235                 FuncRequest label_copy(LFUN_LABEL_COPY_AS_REFERENCE, item.str());
236                 if (inset)
237                         inset->dispatch(cur, label_copy);
238                 break;
239         }
240
241         case LFUN_OUTLINE_UP:
242         case LFUN_OUTLINE_DOWN:
243         case LFUN_OUTLINE_IN:
244         case LFUN_OUTLINE_OUT:
245                 outline(cmd.action());
246                 break;
247
248         default: {
249                 FuncRequest tmpcmd(cmd);
250                 if (inset)
251                         inset->dispatch(cur, tmpcmd);
252         }
253         }
254         cur.endUndoGroup();
255 }
256
257
258 void TocWidget::on_tocTV_activated(QModelIndex const & index)
259 {
260         goTo(index);
261 }
262
263
264 void TocWidget::on_tocTV_pressed(QModelIndex const & index)
265 {
266         DocIterator const & dit = gui_view_.documentBufferView()->cursor();
267         keep_expanded_ = gui_view_.tocModels().currentIndex(current_type_, dit) == index;
268         Qt::MouseButtons const button = QApplication::mouseButtons();
269         if (button & Qt::LeftButton) {
270                 goTo(index);
271                 gui_view_.setFocus();
272                 gui_view_.activateWindow();
273         }
274 }
275
276
277 void TocWidget::on_tocTV_doubleClicked(QModelIndex const &)
278 {
279         keep_expanded_ = true;
280 }
281
282
283 void TocWidget::goTo(QModelIndex const & index)
284 {
285         LYXERR(Debug::GUI, "goto " << index.row()
286                 << ", " << index.column());
287
288         sendDispatch(gui_view_.tocModels().goTo(current_type_, index));
289 }
290
291
292 void TocWidget::on_updateTB_clicked()
293 {
294         // The backend update can take some time so we disable
295         // the controls while waiting.
296         enableControls(false);
297         gui_view_.currentBufferView()->buffer().updateBuffer();
298 }
299
300
301 void TocWidget::on_sortCB_stateChanged(int state)
302 {
303         gui_view_.tocModels().sort(current_type_, state == Qt::Checked);
304         updateViewNow();
305 }
306
307
308 void TocWidget::on_persistentCB_stateChanged(int state)
309 {
310         persistent_ = state == Qt::Checked;
311 }
312
313
314 #if 0
315 /* FIXME (Ugras 17/11/06):
316 I have implemented a indexDepth function to get the model indices. In my
317 opinion, somebody should derive a new qvariant class for tocModelItem
318 which saves the string data and depth information. That will save the
319 depth calculation.  */
320
321 static int indexDepth(QModelIndex const & index, int depth = -1)
322 {
323         ++depth;
324         return index.parent() == QModelIndex()
325                 ? depth : indexDepth(index.parent(), depth);
326 }
327 #endif
328
329 void TocWidget::on_depthSL_valueChanged(int depth)
330 {
331         if (depth == depth_)
332                 return;
333         setTreeDepth(depth);
334         gui_view_.setFocus();
335 }
336
337
338 void TocWidget::setTreeDepth(int depth)
339 {
340         depth_ = depth;
341         if (!tocTV->model())
342                 return;
343
344         if (depth == 0)
345                 tocTV->collapseAll();
346         else
347                 tocTV->expandToDepth(depth - 1);
348 }
349
350
351 void TocWidget::on_typeCO_activated(int index)
352 {
353         if (index == -1)
354                 return;
355         current_type_ = typeCO->itemData(index).toString();
356         updateViewNow();
357         if (typeCO->hasFocus())
358                 gui_view_.setFocus();
359 }
360
361
362 void TocWidget::outline(FuncCode func_code)
363 {
364         QModelIndexList const & list = tocTV->selectionModel()->selectedIndexes();
365         if (list.isEmpty())
366                 return;
367
368         //if another window is active, this attempt will fail,
369         //but it will work at least for the second attempt
370         gui_view_.activateWindow();
371
372         enableControls(false);
373         goTo(list[0]);
374         sendDispatch(FuncRequest(func_code));
375         enableControls(true);
376         gui_view_.setFocus();
377 }
378
379
380 void TocWidget::sendDispatch(FuncRequest fr)
381 {
382
383         fr.setViewOrigin(&gui_view_);
384         GuiWorkArea * old_wa = gui_view_.currentWorkArea();
385         GuiWorkArea * doc_wa = gui_view_.currentMainWorkArea();
386         /* The ToC command should be dispatched to the document work area,
387          * not the Adv. Find&Replace (which is the only other know
388          * possibility.
389          */
390         if (doc_wa != nullptr && doc_wa != old_wa)
391                 gui_view_.setCurrentWorkArea(doc_wa);
392         DispatchResult const & dr = dispatch(fr);
393         /* If the current workarea has not explicitely changed, and the
394          * original one is still visible, let's reset it.
395          */
396         if (gui_view_.currentWorkArea() == doc_wa
397              && gui_view_.hasVisibleWorkArea(old_wa)
398              && doc_wa != old_wa)
399                 gui_view_.setCurrentWorkArea(old_wa);
400         if (dr.error())
401                 gui_view_.message(dr.message());
402 }
403
404
405 void TocWidget::on_moveUpTB_clicked()
406 {
407         outline(LFUN_OUTLINE_UP);
408 }
409
410
411 void TocWidget::on_moveDownTB_clicked()
412 {
413         outline(LFUN_OUTLINE_DOWN);
414 }
415
416
417 void TocWidget::on_moveInTB_clicked()
418 {
419         outline(LFUN_OUTLINE_IN);
420 }
421
422
423 void TocWidget::on_moveOutTB_clicked()
424 {
425         outline(LFUN_OUTLINE_OUT);
426 }
427
428
429 void TocWidget::select(QModelIndex const & index)
430 {
431         if (!index.isValid()) {
432                 LYXERR(Debug::GUI, "TocWidget::select(): QModelIndex is invalid!");
433                 return;
434         }
435
436         tocTV->scrollTo(index);
437         tocTV->clearSelection();
438         tocTV->setCurrentIndex(index);
439 }
440
441
442 void TocWidget::enableControls(bool enable)
443 {
444         updateTB->setEnabled(enable);
445
446         if (!canOutline())
447                 enable = false;
448
449         moveUpTB->setEnabled(enable);
450         moveDownTB->setEnabled(enable);
451         moveInTB->setEnabled(enable);
452         moveOutTB->setEnabled(enable);
453 }
454
455
456 void TocWidget::updateView()
457 {
458         if (!gui_view_.documentBufferView()) {
459                 tocTV->setModel(nullptr);
460                 depthSL->setMaximum(0);
461                 depthSL->setValue(0);
462                 setEnabled(false);
463                 return;
464         }
465         setEnabled(true);
466         bool const is_sortable = isSortable();
467         sortCB->setEnabled(is_sortable);
468         bool focus = tocTV->hasFocus();
469         tocTV->setEnabled(false);
470         tocTV->setUpdatesEnabled(false);
471
472         QAbstractItemModel * toc_model =
473                         gui_view_.tocModels().model(current_type_);
474         if (tocTV->model() != toc_model) {
475                 tocTV->setModel(toc_model);
476                 tocTV->setEditTriggers(QAbstractItemView::NoEditTriggers);
477                 if (persistent_)
478                         setTreeDepth(depth_);
479         }
480
481         sortCB->blockSignals(true);
482         sortCB->setChecked(is_sortable
483                 && gui_view_.tocModels().isSorted(current_type_));
484         sortCB->blockSignals(false);
485
486         persistentCB->setEnabled(canNavigate());
487
488         bool controls_enabled = toc_model && toc_model->rowCount() > 0
489                 && !gui_view_.documentBufferView()->buffer().isReadonly();
490         enableControls(controls_enabled);
491
492         depthSL->setMaximum(gui_view_.tocModels().depth(current_type_));
493         depthSL->setValue(depth_);
494         tocTV->setEnabled(true);
495         tocTV->setUpdatesEnabled(true);
496         if (focus)
497                 tocTV->setFocus();
498
499         // Expensive operations are on a timer.  We finish the update immediately
500         // for sparse edition actions, i.e. there was no edition/cursor movement
501         // recently, then every 300ms.
502         if (!timer_->isActive() && !keep_expanded_) {
503                 finishUpdateView();
504                 timer_->start(300);
505         }
506 }
507
508
509 void TocWidget::updateViewNow()
510 {
511         timer_->stop();
512         updateView();
513 }
514
515
516 void TocWidget::finishUpdateView()
517 {
518         // Profiling shows that this is the expensive stuff in the context of typing
519         // text and moving with arrows. For bigger operations, this is negligible,
520         // and outweighted by TocModels::reset() anyway.
521         if (canNavigate()) {
522                 if (!persistent_ && !keep_expanded_)
523                         setTreeDepth(depth_);
524                 keep_expanded_ = false;
525                 persistentCB->setChecked(persistent_);
526                 // select the item at current cursor location
527                 if (gui_view_.documentBufferView()) {
528                         DocIterator const & dit = gui_view_.documentBufferView()->cursor();
529                         select(gui_view_.tocModels().currentIndex(current_type_, dit));
530                 }
531         }
532         filterContents();
533 }
534
535
536 void TocWidget::filterContents()
537 {
538         if (!tocTV->model())
539                 return;
540
541         QModelIndexList indices = tocTV->model()->match(
542                 tocTV->model()->index(0, 0),
543                 Qt::DisplayRole, ".*", -1,
544 #if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
545                 Qt::MatchFlags(Qt::MatchRegularExpression|Qt::MatchRecursive));
546 #else
547                 // deprecated in Qt 5.15.
548                 Qt::MatchFlags(Qt::MatchRegExp|Qt::MatchRecursive));
549 #endif
550
551         bool const show_active =
552                 activeFilterCO->currentIndex() != 2;
553         bool const show_inactive =
554                 activeFilterCO->currentIndex() != 1;
555
556         int size = indices.size();
557         QString const matchstring = filter_ ? filter_->text() : QString();
558         for (int i = 0; i < size; i++) {
559                 QModelIndex index = indices[i];
560                 bool matches = index.data().toString().contains(
561                                         matchstring, Qt::CaseInsensitive);
562                 TocItem const & item =
563                         gui_view_.tocModels().currentItem(current_type_, index);
564                 matches &= (show_active && item.isOutput()) || (show_inactive && !item.isOutput());
565                 tocTV->setRowHidden(index.row(), index.parent(), !matches);
566         }
567         // recursively unhide parents of unhidden children
568         for (int i = size - 1; i >= 0; i--) {
569                 QModelIndex index = indices[i];
570                 if (!tocTV->isRowHidden(index.row(), index.parent())
571                     && index.parent() != QModelIndex())
572                         tocTV->setRowHidden(index.parent().row(),
573                                             index.parent().parent(), false);
574         }
575 }
576
577
578 static QString decodeType(QString const & str)
579 {
580         QString type = str;
581         if (type.contains("tableofcontents"))
582                 type = "tableofcontents";
583         else if (type.contains("lstlistoflistings"))
584                 type = "listing";
585         else if (type.contains("floatlist")) {
586                 if (type.contains("\"figure"))
587                         type = "figure";
588                 else if (type.contains("\"table"))
589                         type = "table";
590                 else if (type.contains("\"algorithm"))
591                         type = "algorithm";
592         }
593         return type;
594 }
595
596
597 void TocWidget::init(QString const & str)
598 {
599         int new_index;
600         if (str.isEmpty())
601                 new_index = typeCO->findData(current_type_);
602         else
603                 new_index = typeCO->findData(decodeType(str));
604
605         // If everything else fails, settle on the table of contents which is
606         // guaranteed to exist.
607         if (new_index == -1) {
608                 current_type_ = "tableofcontents";
609                 new_index = typeCO->findData(current_type_);
610         } else {
611                 current_type_ = typeCO->itemData(new_index).toString();
612         }
613
614         typeCO->blockSignals(true);
615         typeCO->setCurrentIndex(new_index);
616         typeCO->blockSignals(false);
617         updateViewNow();
618 }
619
620 } // namespace frontend
621 } // namespace lyx
622
623 #include "moc_TocWidget.cpp"