mirror of
https://invent.kde.org/graphics/okular
synced 2024-08-24 18:35:37 +00:00
194 lines
5 KiB
C++
194 lines
5 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License or (at your option) version 3 or any later version
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* accepted by the membership of KDE e.V. (or its successor approved
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* by the membership of KDE e.V.), which shall act as a proxy
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* defined in Section 14 of version 3 of the license.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "magnifierview.h"
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#include <QPainter>
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#include "core/document.h"
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#include "core/generator.h"
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#include "pagepainter.h"
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#include "priorities.h"
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static const int SCALE = 10;
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MagnifierView::MagnifierView(Okular::Document* document, QWidget* parent)
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: QWidget(parent)
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, m_document(document)
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, m_page(nullptr)
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{
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document->addObserver(this);
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}
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MagnifierView::~MagnifierView()
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{
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m_document->removeObserver(this);
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}
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void MagnifierView::notifySetup(const QVector< Okular::Page* >& pages, int setupFlags)
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{
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if (!(setupFlags & Okular::DocumentObserver::DocumentChanged)) {
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return;
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}
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m_pages = pages;
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m_page = nullptr;
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m_current = -1;
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}
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void MagnifierView::notifyPageChanged(int page, int flags)
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{
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Q_UNUSED(page);
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Q_UNUSED(flags);
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if (isVisible()) {
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update();
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}
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}
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bool MagnifierView::canUnloadPixmap(int page) const
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{
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return (page != m_current);
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}
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void MagnifierView::notifyCurrentPageChanged(int previous, int current)
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{
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Q_UNUSED(previous);
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if (current != m_current) {
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m_current = current;
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m_page = m_pages[current];
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if (isVisible()) {
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requestPixmap();
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update();
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}
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}
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}
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void MagnifierView::updateView( const Okular::NormalizedPoint& p, const Okular::Page *page )
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{
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m_viewpoint = p;
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if (page != m_page) // ok, we are screwed
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{
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m_page = page;
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m_current = page->number();
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}
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if (isVisible()) {
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requestPixmap();
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update();
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}
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}
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void MagnifierView::paintEvent(QPaintEvent* e)
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{
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Q_UNUSED(e);
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QPainter p(this);
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if (m_page)
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{
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QRect where = QRect(0, 0, width(), height());
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PagePainter::paintCroppedPageOnPainter(&p, m_page, this, 0, m_page->width() * SCALE, m_page->height() * SCALE, where, normalizedView(), nullptr);
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}
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drawTicks(&p);
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}
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void MagnifierView::move( int x, int y)
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{
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QWidget::move( x, y );
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requestPixmap();
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}
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void MagnifierView::requestPixmap()
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{
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const int full_width = m_page->width() * SCALE;
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const int full_height = m_page->height() * SCALE;
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Okular::NormalizedRect nrect = normalizedView();
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if (m_page && !m_page->hasPixmap( this, full_width, full_height, nrect ))
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{
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QLinkedList< Okular::PixmapRequest * > requestedPixmaps;
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Okular::PixmapRequest *p = new Okular::PixmapRequest( this, m_current, full_width, full_height, PAGEVIEW_PRIO, Okular::PixmapRequest::Asynchronous );
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if ( m_page->hasTilesManager( this ) ) {
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p->setTile( true );
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}
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// request a little bit bigger rectangle then currently viewed, but not the full scale page
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const double rect_width = (nrect.right - nrect.left) * 0.5,
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rect_height = (nrect.bottom - nrect.top) * 0.5;
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const double top = qMax(nrect.top - rect_height, 0.0);
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const double bottom = qMin(nrect.bottom + rect_height, 1.0);
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const double left = qMax(nrect.left - rect_width, 0.0);
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const double right = qMin(nrect.right + rect_width, 1.0);
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p->setNormalizedRect( Okular::NormalizedRect(left, top, right, bottom) );
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requestedPixmaps.push_back( p );
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m_document->requestPixmaps( requestedPixmaps );
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}
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}
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Okular::NormalizedRect MagnifierView::normalizedView() const
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{
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double h = (double)height() / (SCALE * m_page->height() * 2);
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double w = (double)width() / (SCALE * m_page->width() * 2);
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return Okular::NormalizedRect(m_viewpoint.x - w, m_viewpoint.y - h, m_viewpoint.x + w, m_viewpoint.y + h);
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}
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void MagnifierView::drawTicks( QPainter *p )
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{
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p->save();
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p->setPen(QPen(Qt::black, 0));
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// the cross
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p->drawLine(width() / 2, 0, width() / 2, height() - 1);
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p->drawLine(0, height() / 2, width() - 1, height() / 2);
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// the borders
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p->drawLine(0, 0, width() - 1, 0);
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p->drawLine(width() - 1, 0, width() - 1, height() - 1);
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p->drawLine(0, height() - 1, width() - 1, height() - 1);
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p->drawLine(0, height() - 1, 0, 0);
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// ticks
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// TODO possibility to switch units (pt, mm, cc, in, printing dots)
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float ps = (float)SCALE * 5;// how much pixels in widget is one pixel in document * how often
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int tw = 10; // tick size in pixels
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for ( float x = 0; x < width(); x += ps )
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{
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p->drawLine(x, 1, x, tw);
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p->drawLine(x, height() - 1, x, height() - tw - 1);
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p->drawLine(1, x, tw, x);
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p->drawLine(width() - 1, x, width() - tw - 1, x);
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}
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p->restore();
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}
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#include "moc_magnifierview.cpp"
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