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#include "previewwindow.h"
#include "ui_previewwindow.h"
#include "tikzit.h"
#include "latexprocess.h"
#include <QLabel>
#include <QImage>
#include <QPixmap>
#include <QDebug>
#include <QSettings>
#include <QTemporaryDir>
#include <QFile>
#include <QTextStream>
#include <QStandardPaths>
#include <QMessageBox>
#include <cmath>
#include <QMovie>
PreviewWindow::PreviewWindow(QWidget *parent) :
QDialog(parent),
ui(new Ui::PreviewWindow)
{
QSettings settings("tikzit", "tikzit");
ui->setupUi(this);
QVariant geom = settings.value("geometry-preview");
if (geom.isValid()) {
restoreGeometry(geom.toByteArray());
}
_doc = nullptr;
_page = nullptr;
_loader = new QLabel(this);
_loader->setMinimumSize(QSize(16,16));
_loader->setMaximumSize(QSize(16,16));
ui->tabWidget->tabBar()->setTabButton(1, QTabBar::RightSide, _loader);
connect(ui->tabWidget, SIGNAL(currentChanged(int)),
this, SLOT(render()));
render();
}
PreviewWindow::~PreviewWindow()
{
delete ui;
}
void PreviewWindow::setPdf(QString file)
{
Poppler::Document *oldDoc = _doc;
// use loadFromData to avoid holding a lock on the PDF file in windows
QFile f(file);
f.open(QFile::ReadOnly);
QByteArray data = f.readAll();
f.close();
Poppler::Document *newDoc = Poppler::Document::loadFromData(data);
if (!newDoc) {
QMessageBox::warning(nullptr,
"Could not read PDF",
"Could not read: '" + file + "'.");
return;
}
_doc = newDoc;
_doc->setRenderHint(Poppler::Document::Antialiasing);
_doc->setRenderHint(Poppler::Document::TextAntialiasing);
_doc->setRenderHint(Poppler::Document::TextHinting );
_page = _doc->page(0);
render();
if (oldDoc != nullptr) delete oldDoc;
}
QPlainTextEdit *PreviewWindow::outputTextEdit()
{
return ui->output;
}
void PreviewWindow::setStatus(PreviewWindow::Status status)
{
QMovie *oldMovie = _loader->movie();
if (status == PreviewWindow::Running) {
// loader.gif and loader@2x.gif derived from:
// https://commons.wikimedia.org/wiki/Throbbers#/media/File:Linux_Ubuntu_Loader.gif
// licensed GNU Free Documentation License v1.2
QMovie *movie = new QMovie(
(devicePixelRatioF() > 1.0) ? ":images/loader@2x.gif" : ":images/loader.gif",
QByteArray(), _loader);
_loader->setPixmap(QPixmap());
_loader->setMovie(movie);
movie->start();
} else if (status == PreviewWindow::Success) {
_loader->setMovie(nullptr);
QPixmap accept(":images/dialog-accept.svg");
accept.setDevicePixelRatio(3.0);
_loader->setPixmap(accept);
} else if (status == PreviewWindow::Failed) {
_loader->setMovie(nullptr);
QPixmap error(":images/dialog-error.svg");
error.setDevicePixelRatio(3.0);
_loader->setPixmap(error);
}
if (oldMovie != nullptr) oldMovie->deleteLater();
_loader->repaint();
}
void PreviewWindow::closeEvent(QCloseEvent *e) {
QSettings settings("tikzit", "tikzit");
settings.setValue("geometry-preview", saveGeometry());
QDialog::closeEvent(e);
}
void PreviewWindow::resizeEvent(QResizeEvent *e) {
render();
QDialog::resizeEvent(e);
}
void PreviewWindow::showEvent(QShowEvent *e) {
render();
QDialog::showEvent(e);
}
void PreviewWindow::render() {
if (_page == nullptr) return;
QSizeF size = _page->pageSizeF();
qreal ratio = devicePixelRatioF();
QRect rect = ui->scrollArea->visibleRegion().boundingRect();
int w = static_cast<int>(ratio * (rect.width() - 20));
int h = static_cast<int>(ratio * (rect.height() - 20));
qreal scale = fmin(static_cast<qreal>(w) / size.width(),
static_cast<qreal>(h) / size.height());
int dpi = static_cast<int>(scale * 72.0);
int w1 = static_cast<int>(scale * size.width());
int h1 = static_cast<int>(scale * size.height());
// qDebug() << "visible width:" << w;
// qDebug() << "visible height:" << h;
// qDebug() << "doc width:" << size.width();
// qDebug() << "doc height:" << size.height();
// qDebug() << "scale:" << scale;
// qDebug() << "dpi:" << dpi;
QPixmap pm = QPixmap::fromImage(_page->renderToImage(dpi, dpi, (w1 - w)/2, (h1 - h)/2, w, h));
pm.setDevicePixelRatio(ratio);
ui->pdf->setPixmap(pm);
}
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