1 files changed, 122 insertions, 0 deletions
diff --git a/src/gui/previewwindow.cpp b/src/gui/previewwindow.cpp
new file mode 100644
index 0000000..724a951
--- /dev/null
+++ b/src/gui/previewwindow.cpp
@@ -0,0 +1,122 @@
+#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>
+
+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;
+    //setPdf("/home/aleks/ak-algebras.pdf");
+
+    //qDebug() << "preview dir:" << preparePreview("foo");
+    
+    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::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);
+}