From a991943e59bc4341ceef55313642b85565454d86 Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Sun, 16 Dec 2018 16:04:02 +0100
Subject: added dummy preview window, linked to poppler

---
 src/gui/previewwindow.cpp | 61 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

(limited to 'src/gui/previewwindow.cpp')

diff --git a/src/gui/previewwindow.cpp b/src/gui/previewwindow.cpp
index 945c77e..bca28e3 100644
--- a/src/gui/previewwindow.cpp
+++ b/src/gui/previewwindow.cpp
@@ -1,14 +1,75 @@
 #include "previewwindow.h"
 #include "ui_previewwindow.h"
 
+#include <QLabel>
+#include <QImage>
+#include <QPixmap>
+#include <QDebug>
+#include <QRegion>
+#include <QSettings>
+#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 = Poppler::Document::load("/home/aleks/ak-algebras.pdf");
+    _doc->setRenderHint(Poppler::Document::Antialiasing);
+    _doc->setRenderHint(Poppler::Document::TextAntialiasing);
+    _doc->setRenderHint(Poppler::Document::TextHinting	);
+    _page = _doc->page(0);
+    
+    render();
 }
 
 PreviewWindow::~PreviewWindow()
 {
     delete ui;
 }
+
+void PreviewWindow::closeEvent(QCloseEvent *e) {
+    QSettings settings("tikzit", "tikzit");
+    settings.setValue("geometry-preview", saveGeometry());
+}
+
+void PreviewWindow::resizeEvent(QResizeEvent *e) {
+    render();
+    QDialog::resizeEvent(e);
+}
+
+void PreviewWindow::showEvent(QShowEvent *e) {
+    render();
+    QDialog::showEvent(e);
+}
+
+void PreviewWindow::render() {
+    QSizeF size = _page->pageSizeF();
+
+    QRect rect = ui->scrollArea->visibleRegion().boundingRect();
+    int w = rect.width();
+    int h = rect.height();
+    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;
+
+    QImage img = _page->renderToImage(dpi,dpi, (w1 - w)/2,  (h1 - h)/2, w, h);
+    ui->pdf->setPixmap(QPixmap::fromImage(img));
+}
-- 
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