1 /***************************************************************************
2 * Copyright (C) 2005-08 by the Quassel Project *
3 * devel@quassel-irc.org *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) version 3. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
21 #include <QApplication>
23 #include <QGraphicsSceneMouseEvent>
24 #include <QPersistentModelIndex>
29 #include "chatlinemodelitem.h"
30 #include "chatscene.h"
32 #include "clientbacklogmanager.h"
33 #include "columnhandleitem.h"
34 #include "messagefilter.h"
36 #include "qtuistyle.h"
37 #include "chatviewsettings.h"
38 #include "webpreviewitem.h"
40 const qreal minContentsWidth = 200;
42 ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal width, QObject *parent)
43 : QGraphicsScene(0, 0, width, 0, parent),
46 _singleBufferScene(false),
47 _sceneRect(0, 0, width, 0),
50 _cutoffMode(CutoffRight),
55 MessageFilter *filter = qobject_cast<MessageFilter*>(model);
57 _singleBufferScene = filter->isSingleBufferFilter();
60 ChatViewSettings defaultSettings;
61 int defaultFirstColHandlePos = defaultSettings.value("FirstColumnHandlePos", 80).toInt();
62 int defaultSecondColHandlePos = defaultSettings.value("SecondColumnHandlePos", 200).toInt();
64 ChatViewSettings viewSettings(this);
65 _firstColHandlePos = viewSettings.value("FirstColumnHandlePos", defaultFirstColHandlePos).toInt();
66 _secondColHandlePos = viewSettings.value("SecondColumnHandlePos", defaultSecondColHandlePos).toInt();
68 _firstColHandle = new ColumnHandleItem(QtUi::style()->firstColumnSeparator());
69 addItem(_firstColHandle);
70 _firstColHandle->setXPos(_firstColHandlePos);
71 connect(_firstColHandle, SIGNAL(positionChanged(qreal)), this, SLOT(firstHandlePositionChanged(qreal)));
72 connect(this, SIGNAL(sceneRectChanged(const QRectF &)), _firstColHandle, SLOT(sceneRectChanged(const QRectF &)));
74 _secondColHandle = new ColumnHandleItem(QtUi::style()->secondColumnSeparator());
75 addItem(_secondColHandle);
76 _secondColHandle->setXPos(_secondColHandlePos);
77 connect(_secondColHandle, SIGNAL(positionChanged(qreal)), this, SLOT(secondHandlePositionChanged(qreal)));
79 connect(this, SIGNAL(sceneRectChanged(const QRectF &)), _secondColHandle, SLOT(sceneRectChanged(const QRectF &)));
83 connect(model, SIGNAL(rowsInserted(const QModelIndex &, int, int)),
84 this, SLOT(rowsInserted(const QModelIndex &, int, int)));
85 connect(model, SIGNAL(rowsAboutToBeRemoved(const QModelIndex &, int, int)),
86 this, SLOT(rowsAboutToBeRemoved(const QModelIndex &, int, int)));
88 if(model->rowCount() > 0)
89 rowsInserted(QModelIndex(), 0, model->rowCount() - 1);
92 webPreview.delayTimer.setSingleShot(true);
93 connect(&webPreview.delayTimer, SIGNAL(timeout()), this, SLOT(showWebPreviewEvent()));
94 webPreview.deleteTimer.setInterval(600000);
95 connect(&webPreview.deleteTimer, SIGNAL(timeout()), this, SLOT(deleteWebPreviewEvent()));
98 setItemIndexMethod(QGraphicsScene::NoIndex);
101 ChatScene::~ChatScene() {
104 void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
106 // QModelIndex sidx = model()->index(start, 0);
107 // QModelIndex eidx = model()->index(end, 0);
108 // qDebug() << "rowsInserted" << start << end << "-" << sidx.data(MessageModel::MsgIdRole).value<MsgId>() << eidx.data(MessageModel::MsgIdRole).value<MsgId>();
112 qreal width = _sceneRect.width();
113 bool atBottom = (start == _lines.count());
114 bool atTop = !atBottom && (start == 0);
115 bool moveTop = false;
117 if(start < _lines.count()) {
118 y = _lines.value(start)->y();
119 } else if(atBottom && !_lines.isEmpty()) {
120 y = _lines.last()->y() + _lines.last()->height();
123 qreal contentsWidth = width - secondColumnHandle()->sceneRight();
124 qreal senderWidth = secondColumnHandle()->sceneLeft() - firstColumnHandle()->sceneRight();
125 qreal timestampWidth = firstColumnHandle()->sceneLeft();
126 QPointF contentsPos(secondColumnHandle()->sceneRight(), 0);
127 QPointF senderPos(firstColumnHandle()->sceneRight(), 0);
130 for(int i = end; i >= start; i--) {
131 ChatLine *line = new ChatLine(i, model(),
133 timestampWidth, senderWidth, contentsWidth,
134 senderPos, contentsPos);
136 line->setPos(0, y-h);
137 _lines.insert(start, line);
141 for(int i = start; i <= end; i++) {
142 ChatLine *line = new ChatLine(i, model(),
144 timestampWidth, senderWidth, contentsWidth,
145 senderPos, contentsPos);
146 line->setPos(0, y+h);
148 _lines.insert(i, line);
153 // update existing items
154 for(int i = end+1; i < _lines.count(); i++) {
155 _lines[i]->setRow(i);
159 if(_selectionStart >= 0) {
160 int offset = end - start + 1;
161 int oldStart = _selectionStart;
162 if(_selectionStart >= start)
163 _selectionStart += offset;
164 if(_selectionEnd >= start) {
165 _selectionEnd += offset;
166 if(_selectionStart == oldStart)
167 for(int i = start; i < start + offset; i++)
168 _lines[i]->setSelected(true);
170 if(_firstSelectionRow >= start)
171 _firstSelectionRow += offset;
174 // neither pre- or append means we have to do dirty work: move items...
176 int moveEnd = _lines.count() - 1;
178 if(!(atTop || atBottom)) {
179 // move top means: moving 0 to end (aka: end + 1)
180 // move top means: moving end + 1 to _lines.count() - 1 (aka: _lines.count() - (end + 1)
181 if(end + 1 < _lines.count() - end - 1) {
191 for(int i = moveStart; i <= moveEnd; i++) {
193 line->setPos(0, line->pos().y() + offset);
197 // check if all went right
198 Q_ASSERT(start == 0 || _lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height() == _lines.at(start)->pos().y());
200 // if(_lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height() != _lines.at(start)->pos().y()) {
201 // qDebug() << "lines:" << _lines.count() << "start:" << start << "end:" << end;
202 // qDebug() << "line[start - 1]:" << _lines.at(start - 1)->pos().y() << "+" << _lines.at(start - 1)->height() << "=" << _lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height();
203 // qDebug() << "line[start]" << _lines.at(start)->pos().y();
204 // qDebug() << "needed moving:" << !(atTop || atBottom) << moveTop << moveStart << moveEnd << offset;
208 Q_ASSERT(end + 1 == _lines.count() || _lines.at(end)->pos().y() + _lines.at(end)->height() == _lines.at(end + 1)->pos().y());
209 // if(end + 1 < _lines.count()) {
210 // if(_lines.at(end)->pos().y() + _lines.at(end)->height() != _lines.at(end + 1)->pos().y()) {
211 // qDebug() << "lines:" << _lines.count() << "start:" << start << "end:" << end;
212 // qDebug() << "line[end]:" << _lines.at(end)->pos().y() << "+" << _lines.at(end)->height() << "=" << _lines.at(end)->pos().y() + _lines.at(end)->height();
213 // qDebug() << "line[end+1]" << _lines.at(end + 1)->pos().y();
214 // qDebug() << "needed moving:" << !(atTop || atBottom) << moveTop << moveStart << moveEnd << offset;
220 if(start < _firstLineRow) {
221 int prevFirstLineRow = _firstLineRow + (end - start + 1);
222 for(int i = end + 1; i < prevFirstLineRow; i++) {
223 _lines.at(i)->show();
226 // force new search for first proper line
230 if(atBottom || (!atTop && !moveTop)) {
231 emit lastLineChanged(_lines.last(), h);
235 void ChatScene::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) {
238 qreal h = 0; // total height of removed items;
240 bool atTop = (start == 0);
241 bool atBottom = (end == _lines.count() - 1);
242 bool moveTop = false;
246 int row = _selectingItem->row();
247 if(row >= start && row <= end)
251 // remove items from scene
252 QList<ChatLine *>::iterator lineIter = _lines.begin() + start;
253 int lineCount = start;
254 while(lineIter != _lines.end() && lineCount <= end) {
255 h += (*lineIter)->height();
257 lineIter = _lines.erase(lineIter);
261 // update rows of remaining chatlines
262 for(int i = start; i < _lines.count(); i++) {
263 _lines.at(i)->setRow(i);
267 if(_selectionStart >= 0) {
268 int offset = end - start + 1;
269 if(_selectionStart >= start)
270 _selectionStart = qMax(_selectionStart -= offset, start);
271 if(_selectionEnd >= start)
272 _selectionEnd -= offset;
273 if(_firstSelectionRow >= start)
274 _firstSelectionRow -= offset;
276 if(_selectionEnd < _selectionStart) {
277 _isSelecting = false;
278 _selectionStart = -1;
282 // neither removing at bottom or top means we have to move items...
283 if(!(atTop || atBottom)) {
286 int moveEnd = _lines.count() - 1;
287 if(start < _lines.count() - start) {
297 for(int i = moveStart; i <= moveEnd; i++) {
299 line->setPos(0, line->pos().y() + offset);
303 Q_ASSERT(start == 0 || start >= _lines.count() || _lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height() == _lines.at(start)->pos().y());
306 // when searching for the first non-date-line we have to take into account that our
307 // model still contains the just removed lines so we cannot simply call updateSceneRect()
308 int numRows = model()->rowCount();
309 QModelIndex firstLineIdx;
311 bool needOffset = false;
314 if(_firstLineRow >= start && _firstLineRow <= end) {
315 _firstLineRow = end + 1;
318 firstLineIdx = model()->index(_firstLineRow, 0);
319 } while((Message::Type)(model()->data(firstLineIdx, MessageModel::TypeRole).toInt()) == Message::DayChange && _firstLineRow < numRows);
322 _firstLineRow -= end - start + 1;
326 void ChatScene::updateForViewport(qreal width, qreal height) {
327 _viewportHeight = height;
331 void ChatScene::setWidth(qreal width) {
332 if(width == _sceneRect.width())
335 // clock_t startT = clock();
337 // disabling the index while doing this complex updates is about
338 // 2 to 10 times faster!
339 //setItemIndexMethod(QGraphicsScene::NoIndex);
341 QList<ChatLine *>::iterator lineIter = _lines.end();
342 QList<ChatLine *>::iterator lineIterBegin = _lines.begin();
343 qreal linePos = _sceneRect.y() + _sceneRect.height();
344 qreal contentsWidth = width - secondColumnHandle()->sceneRight();
345 while(lineIter != lineIterBegin) {
347 (*lineIter)->setGeometryByWidth(width, contentsWidth, linePos);
349 //setItemIndexMethod(QGraphicsScene::BspTreeIndex);
351 updateSceneRect(width);
354 // clock_t endT = clock();
355 // qDebug() << "resized" << _lines.count() << "in" << (float)(endT - startT) / CLOCKS_PER_SEC << "sec";
358 void ChatScene::firstHandlePositionChanged(qreal xpos) {
359 if(_firstColHandlePos == xpos)
362 _firstColHandlePos = xpos;
363 ChatViewSettings viewSettings(this);
364 viewSettings.setValue("FirstColumnHandlePos", _firstColHandlePos);
365 ChatViewSettings defaultSettings;
366 defaultSettings.setValue("FirstColumnHandlePos", _firstColHandlePos);
368 // clock_t startT = clock();
370 // disabling the index while doing this complex updates is about
371 // 2 to 10 times faster!
372 //setItemIndexMethod(QGraphicsScene::NoIndex);
374 QList<ChatLine *>::iterator lineIter = _lines.end();
375 QList<ChatLine *>::iterator lineIterBegin = _lines.begin();
376 qreal timestampWidth = firstColumnHandle()->sceneLeft();
377 qreal senderWidth = secondColumnHandle()->sceneLeft() - firstColumnHandle()->sceneRight();
378 QPointF senderPos(firstColumnHandle()->sceneRight(), 0);
380 while(lineIter != lineIterBegin) {
382 (*lineIter)->setFirstColumn(timestampWidth, senderWidth, senderPos);
384 //setItemIndexMethod(QGraphicsScene::BspTreeIndex);
388 // clock_t endT = clock();
389 // qDebug() << "resized" << _lines.count() << "in" << (float)(endT - startT) / CLOCKS_PER_SEC << "sec";
392 void ChatScene::secondHandlePositionChanged(qreal xpos) {
393 if(_secondColHandlePos == xpos)
396 _secondColHandlePos = xpos;
397 ChatViewSettings viewSettings(this);
398 viewSettings.setValue("SecondColumnHandlePos", _secondColHandlePos);
399 ChatViewSettings defaultSettings;
400 defaultSettings.setValue("SecondColumnHandlePos", _secondColHandlePos);
402 // clock_t startT = clock();
404 // disabling the index while doing this complex updates is about
405 // 2 to 10 times faster!
406 //setItemIndexMethod(QGraphicsScene::NoIndex);
408 QList<ChatLine *>::iterator lineIter = _lines.end();
409 QList<ChatLine *>::iterator lineIterBegin = _lines.begin();
410 qreal linePos = _sceneRect.y() + _sceneRect.height();
411 qreal senderWidth = secondColumnHandle()->sceneLeft() - firstColumnHandle()->sceneRight();
412 qreal contentsWidth = _sceneRect.width() - secondColumnHandle()->sceneRight();
413 QPointF contentsPos(secondColumnHandle()->sceneRight(), 0);
414 while(lineIter != lineIterBegin) {
416 (*lineIter)->setSecondColumn(senderWidth, contentsWidth, contentsPos, linePos);
418 //setItemIndexMethod(QGraphicsScene::BspTreeIndex);
422 // clock_t endT = clock();
423 // qDebug() << "resized" << _lines.count() << "in" << (float)(endT - startT) / CLOCKS_PER_SEC << "sec";
426 void ChatScene::setHandleXLimits() {
427 _firstColHandle->setXLimits(0, _secondColHandle->sceneLeft());
428 _secondColHandle->setXLimits(_firstColHandle->sceneRight(), width() - minContentsWidth);
431 void ChatScene::setSelectingItem(ChatItem *item) {
432 if(_selectingItem) _selectingItem->clearSelection();
433 _selectingItem = item;
436 void ChatScene::startGlobalSelection(ChatItem *item, const QPointF &itemPos) {
437 _selectionStart = _selectionEnd = _firstSelectionRow = item->row();
438 _selectionStartCol = _selectionMinCol = item->column();
440 _lines[_selectionStart]->setSelected(true, (ChatLineModel::ColumnType)_selectionMinCol);
441 updateSelection(item->mapToScene(itemPos));
444 void ChatScene::updateSelection(const QPointF &pos) {
445 // This is somewhat hacky... we look at the contents item that is at the cursor's y position (ignoring x), since
446 // it has the full height. From this item, we can then determine the row index and hence the ChatLine.
447 ChatItem *contentItem = static_cast<ChatItem *>(itemAt(QPointF(_secondColHandle->sceneRight() + 1, pos.y())));
448 if(!contentItem) return;
450 int curRow = contentItem->row();
452 if(pos.x() > _secondColHandle->sceneRight()) curColumn = ChatLineModel::ContentsColumn;
453 else if(pos.x() > _firstColHandlePos) curColumn = ChatLineModel::SenderColumn;
454 else curColumn = ChatLineModel::TimestampColumn;
456 ChatLineModel::ColumnType minColumn = (ChatLineModel::ColumnType)qMin(curColumn, _selectionStartCol);
457 if(minColumn != _selectionMinCol) {
458 _selectionMinCol = minColumn;
459 for(int l = qMin(_selectionStart, _selectionEnd); l <= qMax(_selectionStart, _selectionEnd); l++) {
460 _lines[l]->setSelected(true, minColumn);
463 int newstart = qMin(curRow, _firstSelectionRow);
464 int newend = qMax(curRow, _firstSelectionRow);
465 if(newstart < _selectionStart) {
466 for(int l = newstart; l < _selectionStart; l++)
467 _lines[l]->setSelected(true, minColumn);
469 if(newstart > _selectionStart) {
470 for(int l = _selectionStart; l < newstart; l++)
471 _lines[l]->setSelected(false);
473 if(newend > _selectionEnd) {
474 for(int l = _selectionEnd+1; l <= newend; l++)
475 _lines[l]->setSelected(true, minColumn);
477 if(newend < _selectionEnd) {
478 for(int l = newend+1; l <= _selectionEnd; l++)
479 _lines[l]->setSelected(false);
482 _selectionStart = newstart;
483 _selectionEnd = newend;
485 if(newstart == newend && minColumn == ChatLineModel::ContentsColumn) {
486 if(!_selectingItem) {
487 // _selectingItem has been removed already
490 _lines[curRow]->setSelected(false);
491 _isSelecting = false;
492 _selectingItem->continueSelecting(_selectingItem->mapFromScene(pos));
496 void ChatScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
497 if(_isSelecting && event->buttons() == Qt::LeftButton) {
498 updateSelection(event->scenePos());
501 QGraphicsScene::mouseMoveEvent(event);
505 void ChatScene::mousePressEvent(QGraphicsSceneMouseEvent *event) {
506 if(_selectionStart >= 0 && event->buttons() == Qt::LeftButton) {
507 for(int l = qMin(_selectionStart, _selectionEnd); l <= qMax(_selectionStart, _selectionEnd); l++) {
508 _lines[l]->setSelected(false);
510 _isSelecting = false;
511 _selectionStart = -1;
512 QGraphicsScene::mousePressEvent(event); // so we can start a new local selection
514 QGraphicsScene::mousePressEvent(event);
518 void ChatScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) {
519 if(_isSelecting && !event->buttons() & Qt::LeftButton) {
520 putToClipboard(selectionToString());
521 _isSelecting = false;
524 QGraphicsScene::mouseReleaseEvent(event);
528 void ChatScene::putToClipboard(const QString &selection) {
529 // TODO Configure clipboards
531 QApplication::clipboard()->setText(selection, QClipboard::Selection);
534 QApplication::clipboard()->setText(selection);
538 //!\brief Convert current selection to human-readable string.
539 QString ChatScene::selectionToString() const {
540 //TODO Make selection format configurable!
541 if(!_isSelecting) return QString();
542 int start = qMin(_selectionStart, _selectionEnd);
543 int end = qMax(_selectionStart, _selectionEnd);
544 if(start < 0 || end >= _lines.count()) {
545 qDebug() << "Invalid selection range:" << start << end;
549 for(int l = start; l <= end; l++) {
550 if(_selectionMinCol == ChatLineModel::TimestampColumn)
551 result += _lines[l]->item(ChatLineModel::TimestampColumn).data(MessageModel::DisplayRole).toString() + " ";
552 if(_selectionMinCol <= ChatLineModel::SenderColumn)
553 result += _lines[l]->item(ChatLineModel::SenderColumn).data(MessageModel::DisplayRole).toString() + " ";
554 result += _lines[l]->item(ChatLineModel::ContentsColumn).data(MessageModel::DisplayRole).toString() + "\n";
559 void ChatScene::requestBacklog() {
560 MessageFilter *filter = qobject_cast<MessageFilter*>(model());
562 return filter->requestBacklog();
566 int ChatScene::sectionByScenePos(int x) {
567 if(x < _firstColHandle->x())
568 return ChatLineModel::TimestampColumn;
569 if(x < _secondColHandle->x())
570 return ChatLineModel::SenderColumn;
572 return ChatLineModel::ContentsColumn;
575 void ChatScene::updateSceneRect(qreal width) {
576 if(_lines.isEmpty()) {
577 updateSceneRect(QRectF(0, 0, width, 0));
581 // we hide day change messages at the top by making the scene rect smaller
582 // and by calling QGraphicsItem::hide() on all leading day change messages
583 // the first one is needed to ensure proper scrollbar ranges
584 // the second for cases where the viewport is larger then the set scenerect
585 // (in this case the items are shown anyways)
586 if(_firstLineRow == -1) {
587 int numRows = model()->rowCount();
589 QModelIndex firstLineIdx;
590 while(_firstLineRow < numRows) {
591 firstLineIdx = model()->index(_firstLineRow, 0);
592 if((Message::Type)(model()->data(firstLineIdx, MessageModel::TypeRole).toInt()) != Message::DayChange)
594 _lines.at(_firstLineRow)->hide();
599 // the following call should be safe. If it crashes something went wrong during insert/remove
600 if(_firstLineRow < _lines.count()) {
601 ChatLine *firstLine = _lines.at(_firstLineRow);
602 ChatLine *lastLine = _lines.last();
603 updateSceneRect(QRectF(0, firstLine->pos().y(), width, lastLine->pos().y() + lastLine->height() - firstLine->pos().y()));
606 updateSceneRect(QRectF(0, 0, width, 0));
610 void ChatScene::updateSceneRect(const QRectF &rect) {
616 bool ChatScene::event(QEvent *e) {
617 if(e->type() == QEvent::ApplicationPaletteChange) {
618 _firstColHandle->setColor(QApplication::palette().windowText().color());
619 _secondColHandle->setColor(QApplication::palette().windowText().color());
621 return QGraphicsScene::event(e);
624 void ChatScene::loadWebPreview(ChatItem *parentItem, const QString &url, const QRectF &urlRect) {
630 if(webPreview.parentItem != parentItem)
631 webPreview.parentItem = parentItem;
633 if(webPreview.url != url) {
634 webPreview.url = url;
635 // load a new web view and delete the old one (if exists)
636 if(webPreview.previewItem && webPreview.previewItem->scene()) {
637 removeItem(webPreview.previewItem);
638 delete webPreview.previewItem;
640 webPreview.previewItem = new WebPreviewItem(url);
641 webPreview.delayTimer.start(2000);
642 webPreview.deleteTimer.stop();
643 } else if(webPreview.previewItem && !webPreview.previewItem->scene()) {
644 // we just have to readd the item to the scene
645 webPreview.delayTimer.start(2000);
646 webPreview.deleteTimer.stop();
648 if(webPreview.urlRect != urlRect) {
649 webPreview.urlRect = urlRect;
650 qreal previewY = urlRect.bottom();
651 qreal previewX = urlRect.x();
652 if(previewY + webPreview.previewItem->boundingRect().height() > sceneRect().bottom())
653 previewY = urlRect.y() - webPreview.previewItem->boundingRect().height();
655 if(previewX + webPreview.previewItem->boundingRect().width() > sceneRect().width())
656 previewX = sceneRect().right() - webPreview.previewItem->boundingRect().width();
658 webPreview.previewItem->setPos(previewX, previewY);
663 void ChatScene::showWebPreviewEvent() {
665 if(webPreview.previewItem)
666 addItem(webPreview.previewItem);
670 void ChatScene::clearWebPreview(ChatItem *parentItem) {
674 if(parentItem == 0 || webPreview.parentItem == parentItem) {
675 if(webPreview.previewItem && webPreview.previewItem->scene()) {
676 removeItem(webPreview.previewItem);
677 webPreview.deleteTimer.start();
679 webPreview.delayTimer.stop();
684 void ChatScene::deleteWebPreviewEvent() {
686 if(webPreview.previewItem) {
687 delete webPreview.previewItem;
688 webPreview.previewItem = 0;
690 webPreview.parentItem = 0;
691 webPreview.url = QString();
692 webPreview.urlRect = QRectF();