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

---
 CMakeLists.txt            | 12 ++++++++-
 src/gui/previewwindow.cpp | 61 +++++++++++++++++++++++++++++++++++++++++++++
 src/gui/previewwindow.h   |  7 ++++++
 src/gui/previewwindow.ui  | 63 +++++++++++++++++++++++++++++++++++++++++++++--
 src/tikzit.cpp            |  4 +++
 5 files changed, 144 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ba0eee5..311dac4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,11 @@ find_package(Qt5 REQUIRED COMPONENTS Core Gui Widgets Network)
 find_package(BISON)
 find_package(FLEX)
 
+# use extra-cmake-modules to find poppler library
+find_package(ECM REQUIRED NO_MODULE)
+set(CMAKE_MODULE_PATH ${ECM_FIND_MODULE_DIR})
+find_package(Poppler REQUIRED COMPONENTS Core Qt5)
+
 include_directories(
     ${PROJECT_SOURCE_DIR}
     ${PROJECT_SOURCE_DIR}/src
@@ -38,6 +43,7 @@ set(SOURCES
     src/gui/mainmenu.cpp
     src/gui/mainwindow.cpp
     src/gui/nodeitem.cpp
+    src/gui/previewwindow.cpp
     src/gui/propertypalette.cpp
     src/gui/styleeditor.cpp
     src/gui/stylepalette.cpp
@@ -67,6 +73,7 @@ set(HEADERS
     src/gui/mainmenu.h
     src/gui/mainwindow.h
     src/gui/nodeitem.h
+    src/gui/previewwindow.h
     src/gui/propertypalette.h
     src/gui/styleeditor.h
     src/gui/stylepalette.h
@@ -81,6 +88,7 @@ set(HEADERS
 set(FORMS
     src/gui/mainmenu.ui
     src/gui/mainwindow.ui
+    src/gui/previewwindow.ui
     src/gui/propertypalette.ui
     src/gui/styleeditor.ui
     src/gui/stylepalette.ui
@@ -99,4 +107,6 @@ add_executable(tikzit
     ${BISON_PARSER_OUTPUTS}
     ${QT_RESOURCES})
 
-target_link_libraries(${PROJECT_NAME} Qt5::Core Qt5::Gui Qt5::Widgets Qt5::Network)
+target_link_libraries(${PROJECT_NAME}
+    Qt5::Core Qt5::Gui Qt5::Widgets Qt5::Network
+    ${Poppler_LIBRARIES})
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));
+}
diff --git a/src/gui/previewwindow.h b/src/gui/previewwindow.h
index 5c4a384..f2366d6 100644
--- a/src/gui/previewwindow.h
+++ b/src/gui/previewwindow.h
@@ -2,6 +2,7 @@
 #define PREVIEWWINDOW_H
 
 #include <QDialog>
+#include <poppler/qt5/poppler-qt5.h>
 
 namespace Ui {
 class PreviewWindow;
@@ -14,9 +15,15 @@ class PreviewWindow : public QDialog
 public:
     explicit PreviewWindow(QWidget *parent = nullptr);
     ~PreviewWindow();
+    void resizeEvent(QResizeEvent *e);
+    void showEvent(QShowEvent *e);
+    void closeEvent(QCloseEvent *e);
 
 private:
     Ui::PreviewWindow *ui;
+    void render();
+    Poppler::Document *_doc;
+    Poppler::Page *_page;
 };
 
 #endif // PREVIEWWINDOW_H
diff --git a/src/gui/previewwindow.ui b/src/gui/previewwindow.ui
index 59224aa..6bb993a 100644
--- a/src/gui/previewwindow.ui
+++ b/src/gui/previewwindow.ui
@@ -1,6 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
  <class>PreviewWindow</class>
- <widget name="PreviewWindow" class="QDialog">
+ <widget class="QDialog" name="PreviewWindow">
   <property name="geometry">
    <rect>
     <x>0</x>
@@ -10,8 +11,66 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Dialog</string>
+   <string>Preview</string>
   </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="pdfTab">
+      <attribute name="title">
+       <string>PDF</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_2">
+       <item>
+        <widget class="QScrollArea" name="scrollArea">
+         <property name="verticalScrollBarPolicy">
+          <enum>Qt::ScrollBarAlwaysOff</enum>
+         </property>
+         <property name="horizontalScrollBarPolicy">
+          <enum>Qt::ScrollBarAlwaysOff</enum>
+         </property>
+         <property name="widgetResizable">
+          <bool>true</bool>
+         </property>
+         <widget class="QWidget" name="scrollAreaWidgetContents">
+          <property name="geometry">
+           <rect>
+            <x>0</x>
+            <y>0</y>
+            <width>358</width>
+            <height>233</height>
+           </rect>
+          </property>
+          <layout class="QVBoxLayout" name="verticalLayout_4">
+           <item>
+            <widget class="QLabel" name="pdf">
+             <property name="text">
+              <string/>
+             </property>
+            </widget>
+           </item>
+          </layout>
+         </widget>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="outputTab">
+      <attribute name="title">
+       <string>Output</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_3">
+       <item>
+        <widget class="QPlainTextEdit" name="output"/>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
  </widget>
  <resources/>
  <connections/>
diff --git a/src/tikzit.cpp b/src/tikzit.cpp
index 1c3ba23..d69f4a8 100644
--- a/src/tikzit.cpp
+++ b/src/tikzit.cpp
@@ -19,6 +19,7 @@
 #include "tikzit.h"
 #include "tikzassembler.h"
 #include "tikzstyles.h"
+#include "previewwindow.h"
 
 #include <QFile>
 #include <QFileDialog>
@@ -126,6 +127,9 @@ void Tikzit::init()
     if (check.toBool()) {
         checkForUpdates();
     }
+
+    PreviewWindow *preview = new PreviewWindow();
+    preview->show();
 }
 
 //QMenuBar *Tikzit::mainMenu() const
-- 
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