pdfwidget.cpp

爱可视605看PDF程式源代码, 基于APDF

    } else if ((int)e->type() == PagePreview) {
        pagePreview(e->data());
    } else {
        QScrollView::customEvent(e);
    }
}

void PDFWidget::pageReady(void* args)
{
	QImage *image = (QImage*)args;
	
	delete pixmap;
	pixmap = new QPixmap();
	pixmap->convertFromImage(*image, Qt::AutoColor);
	delete image;

	running = false;
	resizeContents(pixmap->width() <= viewport()->width() ? viewport()->width() : pixmap->width() + borderWidth * 2,
			(pixmap->height() <= viewport()->height()) ? viewport()->height() : pixmap->height() + borderWidth * 2);
	updateContents(0, 0, contentsWidth(), contentsHeight());
	setContentsPos(scheduledContentsPosX, scheduledContentsPosY);
	updateViewRect();
	selectedLink = selectLink();
	qWarning("selectedLink = %i", selectedLink);
	drawLinks(pixmap, selectedLink);
	
	emit rendererRunning(false);
}

void PDFWidget::invalidatePixmap(void)
{
	delete pixmap;
	pixmap = 0;
}

int PDFWidget::selectLink()
{
	Poppler::Links links = page->getLinks();
	int linkCnt = links.getNumLinks();
	if (linkCnt < 1 || !pixmap) {
		//qWarning("no pixmap or no link on this page");
		return -1;
	}

	// is the currently selected link still visible?
	if (selectedLink != -1 && selectedLink < linkCnt) {
		Poppler::Link l = links.getLink(selectedLink);
		if (viewRect.contains(l.getScreenCoords().center(), true)) {
			//qWarning("old link %i si still visible", selectedLink);
			return l.getId();
		}
	}

	Poppler::Link selected(9999, 9999, 9999, 9999, -1);	// invalid
	for (int i = 0; i < linkCnt; i++) {
		Poppler::Link l = links.getLink(i);
		if (viewRect.contains(l.getScreenCoords().center(), true)) {
			QPoint lcoord = l.getScreenCoords().center();
			// select the link nearest to the top/left
			if (direction == Forward) {
				if (lcoord.y() < selected.getScreenCoords().center().y() &&
					lcoord.x() < selected.getScreenCoords().center().x()) {
					selected = l;
				}
			}
			// select the link nearest to the bottom right
			else if (direction == Back) {
				if (abs(lcoord.y() - pixmap->width()) <
					abs(selected.getScreenCoords().center().y() - pixmap->width())) {
					selected = l;
				}
			}
		}
	}
	return selected.getId();
}

int PDFWidget::selectNextLink(int direction, int currentLink)
{
	Poppler::Links links = page->getLinks();
	int linkCnt = links.getNumLinks();

	if (linkCnt <= 0 || !pixmap) {
		//qWarning("no links on this page");
		return -1;
	}

	if (currentLink == -1 || currentLink >= linkCnt) {
		//qWarning("no valid link. trying to select a new one");
		return selectLink();
	}

	if (currentLink == -1) {
		//qWarning("still no valid link...");
		return -1;
	}

	//qWarning("ok the selected link is %i", currentLink);

	Poppler::Link selected = links.getLink(currentLink);
	Poppler::Link tmp;
	Poppler::Link tmpSameRow;

	int selected_y = selected.getScreenCoords().center().y();
	int selected_x = selected.getScreenCoords().center().x();

	for (int i = 0; i < linkCnt; i++) {
		Poppler::Link l = links.getLink(i);
		// inside the visible screen?
		if (viewRect.contains(l.getScreenCoords().center(), true)) {
			QPoint lcoord = l.getScreenCoords().center();
			if (direction == Up) {
				// handle links in the same row further left
				if (selected.getId() != l.getId() && lcoord.y() ==
						selected_y && lcoord.x() < selected_x) {
					if (tmpSameRow.getId() == -1) {
						tmpSameRow = l;
					}
					else if (abs(lcoord.x() - selected_x) < abs(tmpSameRow.getScreenCoords().center().x() - selected_x)) {
						tmpSameRow = l;
					}
				}
				// handle links further up
				else if (lcoord.y() < selected_y) {
					if (tmp.getId() != -1) {
						if (abs(selected_y - lcoord.y()) <= abs(selected_y - tmp.getScreenCoords().center().y())) {
							// if there are several links further up on the same row take the one most rigth
							if (lcoord.y() == tmp.getScreenCoords().center().y()) {
								if (lcoord.x() > tmp.getScreenCoords().center().x()) {
									tmp = l;
								}
							}
							else {
								tmp = l;
							}
						}
					}
					else {
						tmp = l;
					}
				}
			}
			else if (direction == Down) {
				// handle links in the same row further right
				if (selected.getId() != l.getId() && lcoord.y() ==
						selected_y && lcoord.x() > selected_x) {
					if (tmpSameRow.getId() == -1) {
						tmpSameRow = l;
					}
					else if (abs(lcoord.x() - selected_x) < abs(tmpSameRow.getScreenCoords().center().x() - selected_x)) {
						tmpSameRow = l;
					}
				}
				// handle links further down
				else if (lcoord.y() > selected_y) {
					if (tmp.getId() != -1) {
						if (abs(selected_y - lcoord.y()) <= abs(selected_y - tmp.getScreenCoords().center().y())) {
							// if there are several links further down on the same row take the one most left
							if (lcoord.y() == tmp.getScreenCoords().center().y()) {
								if (lcoord.x() < tmp.getScreenCoords().center().x()) {
									tmp = l;
								}
							}
							else {
								tmp = l;
							}
						}
					}
					else {
						tmp = l;
					}
				}
			}
			else if (direction == Left) {
				if (selected.getId() != l.getId() && lcoord.x() < selected_x) {
					if (tmp.getId() == -1) {
						tmp = l;
					}
					else if (abs(lcoord.x() - selected_x) < abs(tmp.getScreenCoords().center().x() - selected_x)) {
						tmp = l;
					}
				}
			}
			else if (direction == Right) {
				if (selected.getId() != l.getId() && lcoord.x() > selected_x) {
					if (tmp.getId() == -1) {
						tmp = l;
					}
					else if (abs(lcoord.x() - selected_x) < abs(tmp.getScreenCoords().center().x() - selected_x)) {
						tmp = l;
					}
				}
			}
		}
	}

	// links on the same row have precedence
	if (tmpSameRow.getId() != -1) {
		selected = tmpSameRow;
		//qWarning("next selected link (sameRow): %i", selected.getId());
	} else if (tmp.getId() != -1) {
		selected = tmp;
		//qWarning("next selected link: %i", selected.getId());
	} else {
		if (!viewRect.contains(selected.getScreenCoords().center(), true)) {
			//qWarning("no new selected link");
			return -1;
		}
	}
	
	//qWarning("the returned selectedLink is %i", selected.getId());

	return selected.getId();
}

void PDFWidget::drawLinks(QPixmap *pixmap, int selectedLink)
{
	if (!pixmap || running)
		return;

	Poppler::Links links = page->getLinks();
	int linkCnt = links.getNumLinks();
	QPainter p(pixmap);
	QPen red(QColor(255, 0, 0), 1);
	QPen blue(QColor(152, 204, 255), 1);

	p.setPen(blue);
	for (int i = 0; i < linkCnt; i++) {
		if (i != selectedLink) {
			p.drawRect(links.getLink(i).getScreenCoords());
		}
	}

	if (selectedLink != -1) {
		//qWarning("drawLink selected %i", selectedLink);
		p.setPen(red);
		p.drawRect(links.getLink(selectedLink).getScreenCoords());
	}
}

void PDFWidget::followLink()
{
	//qWarning("follow link");
	if (selectedLink == -1) {
		return;
	}

	Poppler::Links links = page->getLinks();
	Poppler::Link link = links.getLink(selectedLink);
	QPoint center = link.getLinkCenterScreenCoord();
	//qWarning("x = %i, y = %i", center.x(), center.y());
	int nxt = page->linkDest((double)center.x(), (double)center.y());
	//qWarning("nxt = %i", nxt);
	if (nxt != -1 && nxt > 0 && nxt < doc->getNumPages()) {
		navStack.append(PageNum(currentPage));
		//qWarning("put %i on the navStack", currentPage);
		emit pagesInHistory(true);
		jumpToPage(nxt);
	}
}

bool PDFWidget::rendererRunning(void)
{
	return running;
}

// private slot
void PDFWidget::pagePreview(void* arg) 
{
	QImage *image = (QImage*)arg;
	delete pixmap;
	pixmap = new QPixmap();
	pixmap->convertFromImage(*image, Qt::AutoColor);
	delete image;

	resizeContents(pixmap->width() <= viewport()->width() ? viewport()->width() : pixmap->width() + borderWidth * 2,
				(pixmap->height() <= viewport()->height()) ? viewport()->height() : pixmap->height() + borderWidth * 2);
	updateContents(0, 0, contentsWidth(), contentsHeight());
	if (firstPreview) {
		firstPreview = false;
		setContentsPos(scheduledContentsPosX, scheduledContentsPosY);
	}
}

void PDFWidget::emitNavSignals() {

    if (currentPage == 0)
        emit isFirstPage(true);
    else
        emit isFirstPage(false);

    //qWarning("cp: %i, mp: %i", currentPage, doc->getNumPages());

    if (currentPage == doc->getNumPages() - 1)
        emit isLastPage(true);
    else
        emit isLastPage(false);
}

// this method is necessary to display documents correctly in "fit to width"
// and "fit to page" mode if the pages of the documents have different dimensions.
void PDFWidget::recalcZoomAndDisplay()
{
	if (zoomLevel == FIT_TO_PAGE || zoomLevel == FIT_TO_WIDTH) {
		setZoom(zoomLevel);
	}
	else {
		display();
	}
}

// public slot
void PDFWidget::nextPage()
{
	if (currentPage + 1 < doc->getNumPages()) {
		selectedLink = -1;
		direction = Forward;
		currentPage++;
		delete page;
		page = doc->getPage(currentPage);
		emitNavSignals();
		recalcZoomAndDisplay();
		scheduleContentsPosUpdate(contentsX(), 0);
	}
}

// public slot
void PDFWidget::prevPage()
{
	if (currentPage > 0) {
		selectedLink = -1;
		direction = Back;
		currentPage--;
		delete page;
		page = doc->getPage(currentPage);
		emitNavSignals();
		recalcZoomAndDisplay();
		scheduleContentsPosUpdate(contentsX(), contentsHeight() - visibleHeight());
	}
}

// public slot
void PDFWidget::lastPage() 
{
	if (currentPage != doc->getNumPages() - 1) {
		selectedLink = -1;
		direction = Forward;
		currentPage = doc->getNumPages() - 1;
		delete page;
		page = doc->getPage(currentPage);
		emitNavSignals();
		recalcZoomAndDisplay();
		scheduleContentsPosUpdate(contentsX(), 0);
	}
}

// public slot
void PDFWidget::firstPage() {
	if (currentPage != 0) {
		selectedLink = -1;
		direction = Back;
		currentPage = 0;
		delete page;
		page = doc->getPage(currentPage);
		emitNavSignals();
		recalcZoomAndDisplay();
		scheduleContentsPosUpdate(contentsX(), 0);
	}
}

// public slot
void PDFWidget::jumpToPage(int pageX)
{
	if ((pageX <= doc->getNumPages() - 1) && (pageX != currentPage)) {
		selectedLink = -1;
		direction = Forward;
		currentPage = pageX;
		delete page;
		page = doc->getPage(currentPage);
		recalcZoomAndDisplay();
		scheduleContentsPosUpdate(contentsX(), 0);
		emitNavSignals();
	}
}

void PDFWidget::setHotspot(QSize s)
{
	m_hotspot = s;
}

void PDFWidget::viewportMousePressEvent(QMouseEvent *e)
{
	if ( !doc ) {
		return;
	}

	int x = e->pos().x(), y = e->pos().y();
	if ( (x > width() - m_hotspot.width()) && (y > height() - m_hotspot.height()) ) {
		emit hotspot();
	}
	else if (e->button() == QMouseEvent::LeftButton) {
		m_panning = true;
		m_panningPos = new QPoint(x, y);

		// did the user touch a link?
		viewportToContents(x, y, x, y);
		x -= x_origin; y -= y_origin;
		m_linkSelected = page->isLink(x, y);
		if (m_linkSelected) {
			m_LinkPos = new QPoint(e->pos().x(), e->pos().y());
			int tmpLink = page->linkId(x, y);
			if (tmpLink != -1) {
				selectedLink = tmpLink;
				//qWarning("clickedLink = %i", selectedLink);
				drawLinks(pixmap, selectedLink);
				updateContents(0, 0, contentsWidth(), contentsHeight());
			}
		}
	}
}

void PDFWidget::viewportMouseReleaseEvent(QMouseEvent * e)
{
	if ( !doc ) {
		return;
	}

	if (e->button() == QMouseEvent::LeftButton) {
		m_panning = false;
		delete m_panningPos;
		m_panningPos = 0;

		if (m_linkSelected) {
			int x, y;
			viewportToContents(e->pos().x(), e->pos().y(), x, y);
			int nxt = page->linkDest(x - x_origin, y - y_origin);
			if (nxt != -1 && nxt > 0 && nxt < doc->getNumPages()) {
				navStack.append(PageNum(currentPage));
				//qWarning("put %i on the navStack", currentPage);
				emit pagesInHistory(true);
				jumpToPage(nxt);
			}
			m_linkSelected = false;
			delete m_LinkPos;
		}
		else {
			direction = Forward;
			selectedLink = selectLink();
			//qWarning("selectedLink = %i", selectedLink);
			drawLinks(pixmap, selectedLink);
			updateContents(0, 0, contentsWidth(), contentsHeight());
		}
	}
}


void PDFWidget::moveBack()
{
	if (navStack.fromLast() != navStack.end()) {
		int pageNum = navStack.last().getPageNum();
		navStack.remove(navStack.fromLast());
		//qWarning("took %i from the navStack", pageNum);
		emit pagesInHistory(navStack.count());
		jumpToPage(pageNum);
	}
}

bool PDFWidget::arePagesInHistory(void)
{
	return navStack.count() > 0;
}

void PDFWidget::viewportMouseMoveEvent(QMouseEvent * e)
{
	if ( !doc ) {
		return;
	}

	if (e->state() & QMouseEvent::LeftButton && m_panning == true) {
		updateViewRect();

		scrollBy(m_panningPos->x() - e->x(), m_panningPos->y() - e->y());
		m_panningPos->setX(e->x());
		m_panningPos->setY(e->y());

		// to much moving around, probably clicking the link wasn't the
		// users intention
		int x, y;
		viewportToContents(e->pos().x(), e->pos().y(), x, y);
		if (m_linkSelected) {
			if ((abs(m_LinkPos->x() - (x - x_origin) ) > 3) ||
				abs(m_LinkPos->y() - (y - y_origin) > 3)) {
				m_linkSelected = false;
			}
		}

		// lets see if we're above a link
		int tmpLink = page->linkId(x - x_origin,  y - y_origin);
		if (tmpLink != -1) {
			selectedLink = tmpLink;
			//qWarning("movedToLink = %i", selectedLink);
			drawLinks(pixmap, selectedLink);
			updateContents(0, 0, contentsWidth(), contentsHeight());
		}
	}
}

void PDFWidget::scheduleContentsPosUpdate( int x, int y ) {
    scheduledContentsPosX = x;
    scheduledContentsPosY = y;
}

int PDFWidget::getPageWidth() const
{
	Poppler::Page::Orientation orientation = page->orientation();
	if (orientation == Poppler::Page::Landscape ||
		orientation == Poppler::Page::Seascape) {
		return page->pageSize().height();
	}
	else {
		return page->pageSize().width();
	}
}

int PDFWidget::getPageHeight() const
{
	Poppler::Page::Orientation orientation = page->orientation();
	if (orientation == Poppler::Page::Landscape ||
		orientation == Poppler::Page::Seascape) {
		return page->pageSize().width();
	}
	else {
		return page->pageSize().height();
	}
}

void PDFWidget::redisplay()
{
	if (doc) {
		recalcZoomAndDisplay();
	}
	else {
		qWarning("No document set (%s:%i)", __FILE__, __LINE__);
	}
}

void PDFWidget::resizeEvent(QResizeEvent *)
{
	//qWarning("PDFWidget::resizeEvent(QResizeEvent *)");
	invalidatePixmap();
	resizeContents(viewport()->width(), viewport()->height());
	//qWarning("viewport()->width() = %i, viewport()->height() = %i", viewport()->width(), viewport()->height());
	setContentsPos(0, 0);
	updateContents(0, 0, contentsWidth(), contentsHeight());
	redisplay();
}

int PDFWidget::getPageNumber()
{
	return currentPage + 1;
}

int PDFWidget::getNumPages()
{
	int ret = 0;
	if (doc)
		ret = doc->getNumPages();
	return ret;
}

int PDFWidget::maxZoomLevel = 8;