From 0615dcb854da736e11665ad3387ecba0adbd8cd8 Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Wed, 2 Jan 2019 11:42:37 +0100
Subject: finished export dialog (closes #49)

---
 src/gui/exportdialog.cpp  | 64 +++++++++++++++++++++++++++++++++++++++++++++--
 src/gui/exportdialog.h    |  7 +++++-
 src/gui/previewwindow.cpp | 18 ++++++++++++-
 3 files changed, 85 insertions(+), 4 deletions(-)

diff --git a/src/gui/exportdialog.cpp b/src/gui/exportdialog.cpp
index b176c71..cc0be7b 100644
--- a/src/gui/exportdialog.cpp
+++ b/src/gui/exportdialog.cpp
@@ -5,11 +5,13 @@
 
 #include <QFileDialog>
 #include <QSettings>
+#include <QStandardPaths>
 
 ExportDialog::ExportDialog(QWidget *parent) :
     QDialog(parent),
     ui(new Ui::ExportDialog)
 {
+    QSettings settings("tikzit", "tikzit");
     ui->setupUi(this);
 
     QIntValidator *v = new QIntValidator(this);
@@ -31,6 +33,32 @@ ExportDialog::ExportDialog(QWidget *parent) :
         ui->width->blockSignals(false);
         ui->height->blockSignals(false);
     }
+
+    if (!settings.value("previous-export-file-format").isNull()) {
+        ui->fileFormat->setCurrentIndex(settings.value("previous-export-file-format").toInt());
+    }
+
+    // set a default export file
+    QString path = (!settings.value("previous-export-file-path").isNull()) ?
+        settings.value("previous-export-file-path").toString() :
+        QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
+
+    QString suffix;
+    switch (ui->fileFormat->currentIndex()) {
+        case PNG: suffix = ".png"; break;
+        case JPG: suffix = ".jpg"; break;
+        case PDF: suffix = ".pdf"; break;
+    }
+
+    QString fileName;
+    int i = 0;
+    bool exists = true;
+    while (exists) {
+        fileName = path + "/tikzit_image" + QString::number(i) + suffix;
+        exists = QFileInfo::exists(fileName);
+        ++i;
+    }
+    ui->filePath->setText(QDir::toNativeSeparators(fileName));
 }
 
 ExportDialog::~ExportDialog()
@@ -38,6 +66,31 @@ ExportDialog::~ExportDialog()
     delete ui;
 }
 
+QString ExportDialog::filePath()
+{
+    return ui->filePath->text();
+}
+
+QSize ExportDialog::size()
+{
+    return QSize(ui->width->text().toInt(),
+                 ui->height->text().toInt());
+}
+
+ExportDialog::Format ExportDialog::fileFormat()
+{
+    return static_cast<Format>(ui->fileFormat->currentIndex());
+}
+
+void ExportDialog::accept()
+{
+    QSettings settings("tikzit", "tikzit");
+    QFileInfo fi(filePath());
+    settings.setValue("previous-export-file-path", fi.absolutePath());
+    settings.setValue("previous-export-file-format", fileFormat());
+    QDialog::accept();
+}
+
 void ExportDialog::setHeightFromWidth()
 {
     if (ui->keepAspect->isChecked()) {
@@ -88,8 +141,14 @@ void ExportDialog::on_browseButton_clicked()
     dialog.setAcceptMode(QFileDialog::AcceptSave);
     dialog.setNameFilter(ui->fileFormat->currentText());
     dialog.setFileMode(QFileDialog::AnyFile);
-    if (!settings.value("previous-export-file-path").isNull())
-        dialog.setDirectory(settings.value("previous-export-file-path").toString());
+    dialog.setLabelText(QFileDialog::Accept, "Select");
+
+    QFileInfo fi(ui->filePath->text());
+    if (!fi.absolutePath().isEmpty()) {
+        dialog.setDirectory(fi.absolutePath());
+        dialog.selectFile(fi.baseName());
+    }
+
     dialog.setOption(QFileDialog::DontUseNativeDialog);
 
     if (dialog.exec()) {
@@ -101,6 +160,7 @@ void ExportDialog::on_fileFormat_currentIndexChanged(int f)
 {
     ui->width->setEnabled(f != PDF);
     ui->height->setEnabled(f != PDF);
+    ui->keepAspect->setEnabled(f != PDF);
 
     QString path = ui->filePath->text();
     if (!path.isEmpty()) {
diff --git a/src/gui/exportdialog.h b/src/gui/exportdialog.h
index 064c968..6788560 100644
--- a/src/gui/exportdialog.h
+++ b/src/gui/exportdialog.h
@@ -13,12 +13,17 @@ class ExportDialog : public QDialog
 
 public:
     explicit ExportDialog(QWidget *parent = nullptr);
-    ~ExportDialog();
+    ~ExportDialog() override;
     enum Format {
         PNG = 0,
         JPG = 1,
         PDF = 2
     };
+    QString filePath();
+    QSize size();
+    Format fileFormat();
+public slots:
+    void accept() override;
 
 protected slots:
     void setHeightFromWidth();
diff --git a/src/gui/previewwindow.cpp b/src/gui/previewwindow.cpp
index c27c1be..ec66f81 100644
--- a/src/gui/previewwindow.cpp
+++ b/src/gui/previewwindow.cpp
@@ -156,11 +156,27 @@ void PreviewWindow::render() {
 
 void PreviewWindow::exportImage()
 {
+    QSettings settings("tikzit", "tikzit");
     if (_doc == nullptr) return;
     ExportDialog *d = new ExportDialog(this);
     int ret = d->exec();
     if (ret == QDialog::Accepted) {
-        qDebug() << "save accepted";
+        bool success;
+        if (d->fileFormat() == ExportDialog::PDF) {
+            success = _doc->exportPdf(d->filePath());
+        } else {
+            success = _doc->exportImage(
+                        d->filePath(),
+                        (d->fileFormat() == ExportDialog::PNG) ? "PNG" : "JPG",
+                        d->size());
+        }
+
+        if (!success) {
+            QMessageBox::warning(this,
+                "Error",
+                "Could not write to: '" + d->filePath() +
+                   "'. Check file permissions or choose a new location.");
+        }
     }
 }
 
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