Allow select ocr language in SelectionDialog.

Support this in Recognizer and Translator.

Recognizer.cpp

@@ -31,28 +31,28 @@ void Recognizer::applySettings()
   imageScale_ = settings.value (settings_names::imageScale,
                                 settings_values::imageScale).toInt ();
 
-  initEngine ();
+  initEngine (engine_);
 }
 
-bool Recognizer::initEngine()
+bool Recognizer::initEngine(tesseract::TessBaseAPI *&engine)
 {
   if (tessDataDir_.isEmpty () || ocrLanguage_.isEmpty ())
   {
     emit error (tr ("Неверные параметры для OCR"));
     return false;
   }
-  if (engine_ != NULL)
+  if (engine != NULL)
   {
-    delete engine_;
+    delete engine;
   }
-  engine_ = new tesseract::TessBaseAPI();
-  int result = engine_->Init(qPrintable (tessDataDir_), qPrintable (ocrLanguage_),
+  engine = new tesseract::TessBaseAPI();
+  int result = engine->Init(qPrintable (tessDataDir_), qPrintable (ocrLanguage_),
                              tesseract::OEM_DEFAULT);
   if (result != 0)
   {
     emit error (tr ("Ошибка инициализации OCR: %1").arg (result));
-    delete engine_;
-    engine_ = NULL;
+    delete engine;
+    engine = NULL;
     return false;
   }
   return true;
@@ -61,9 +61,12 @@ bool Recognizer::initEngine()
 void Recognizer::recognize(ProcessingItem item)
 {
   Q_ASSERT (!item.source.isNull ());
-  if (engine_ == NULL)
+  bool isCustomLanguage = (!item.ocrLanguage.isEmpty () &&
+                           item.ocrLanguage != ocrLanguage_);
+  tesseract::TessBaseAPI* engine = (isCustomLanguage) ? NULL : engine_;
+  if (engine == NULL)
   {
-    if (!initEngine ())
+    if (!initEngine (engine))
     {
       return;
     }
@@ -71,12 +74,18 @@ void Recognizer::recognize(ProcessingItem item)
 
   Pix* image = prepareImage (item.source.toImage (), imageScale_);
   Q_ASSERT (image != NULL);
-  engine_->SetImage (image);
-  char* outText = engine_->GetUTF8Text();
-  QString result = QString (outText).trimmed ();
-  engine_->Clear();
+  engine->SetImage (image);
+  char* outText = engine->GetUTF8Text();
+  engine->Clear();
   cleanupImage (&image);
 
+  QString result = QString (outText).trimmed ();
+  delete [] outText;
+  if (isCustomLanguage)
+  {
+    delete engine;
+  }
+
   if (!result.isEmpty ())
   {
     item.recognized = result;
@@ -86,5 +95,4 @@ void Recognizer::recognize(ProcessingItem item)
   {
     emit error (tr ("Текст не распознан."));
   }
-  delete [] outText;
 }

Recognizer.h

@@ -26,7 +26,7 @@ class Recognizer : public QObject
     void applySettings ();
 
   private:
-    bool initEngine ();
+    bool initEngine (tesseract::TessBaseAPI*&engine);
 
   private:
     tesseract::TessBaseAPI* engine_;

SelectionDialog.cpp

@@ -1,13 +1,16 @@
 #include "SelectionDialog.h"
 #include "ui_SelectionDialog.h"
+#include "LanguageHelper.h"
 
 #include <QMouseEvent>
 #include <QPainter>
 #include <QDebug>
+#include <QMenu>
 
-SelectionDialog::SelectionDialog(QWidget *parent) :
+SelectionDialog::SelectionDialog(const LanguageHelper &dictionary, QWidget *parent) :
   QDialog(parent),
-  ui(new Ui::SelectionDialog)
+  ui(new Ui::SelectionDialog), dictionary_ (dictionary),
+  languageMenu_ (new QMenu)
 {
   ui->setupUi(this);
   setWindowFlags (Qt::FramelessWindowHint | Qt::NoDropShadowWindowHint |
@@ -15,6 +18,8 @@ SelectionDialog::SelectionDialog(QWidget *parent) :
 
   ui->label->setAutoFillBackground(false);
   ui->label->installEventFilter (this);
+
+  updateMenu ();
 }
 
 SelectionDialog::~SelectionDialog()
@@ -22,6 +27,49 @@ SelectionDialog::~SelectionDialog()
   delete ui;
 }
 
+void SelectionDialog::updateMenu()
+{
+  Q_CHECK_PTR (languageMenu_);
+  languageMenu_->clear ();
+  QStringList languages = dictionary_.availableOcrLanguagesUi ();
+  if (languages.isEmpty ())
+  {
+    return;
+  }
+
+  const int max = 10;
+
+  if (languages.size () <= max)
+  {
+    foreach (const QString& language, languages)
+    {
+      languageMenu_->addAction (language);
+    }
+  }
+  else
+  {
+    int subIndex = max;
+    QMenu* subMenu = NULL;
+    QString prevLetter;
+    foreach (const QString& language, languages)
+    {
+      QString curLetter = language.left (1);
+      if (++subIndex >= max && prevLetter != curLetter)
+      {
+        if (subMenu != NULL)
+        {
+          subMenu->setTitle (subMenu->title () + " - " + prevLetter);
+        }
+        subMenu = languageMenu_->addMenu (curLetter);
+        subIndex = 0;
+      }
+      prevLetter = curLetter;
+      subMenu->addAction (language);
+    }
+    subMenu->setTitle (subMenu->title () + " - " + prevLetter);
+  }
+}
+
 bool SelectionDialog::eventFilter(QObject* object, QEvent* event)
 {
   if (object != ui->label)
@@ -29,41 +77,24 @@ bool SelectionDialog::eventFilter(QObject* object, QEvent* event)
     return QDialog::eventFilter (object, event);
   }
 
-  if (event->type () == QEvent::MouseButtonPress)
+  if (event->type () == QEvent::Show)
+  {
+    startSelectPos_ = currentSelectPos_ = QPoint ();
+  }
+  else if (event->type () == QEvent::MouseButtonPress)
   {
     QMouseEvent* mouseEvent = static_cast <QMouseEvent*> (event);
-    if (mouseEvent->button () == Qt::LeftButton)
+    if ((mouseEvent->button () == Qt::LeftButton ||
+         mouseEvent->button () == Qt::RightButton) && startSelectPos_.isNull ())
     {
       startSelectPos_ = mouseEvent->pos ();
     }
   }
-  else if (event->type () == QEvent::MouseButtonRelease)
-  {
-    QMouseEvent* mouseEvent = static_cast <QMouseEvent*> (event);
-    if (mouseEvent->button () == Qt::LeftButton)
-    {
-      if (startSelectPos_.isNull () || currentPixmap_.isNull ())
-      {
-        QDialog::eventFilter (object, event);
-      }
-      QPoint endPos = mouseEvent->pos ();
-      QRect selection = QRect (startSelectPos_, endPos).normalized ();
-      startSelectPos_ = currentSelectPos_ = QPoint ();
-      QPixmap selectedPixmap = currentPixmap_.copy (selection);
-      if (!selectedPixmap.isNull ())
-      {
-        ProcessingItem item;
-        item.source = selectedPixmap;
-        item.screenPos = selection.topLeft ();
-        emit selected (item);
-        accept ();
-      }
-    }
-  }
   else if (event->type () == QEvent::MouseMove)
   {
     QMouseEvent* mouseEvent = static_cast <QMouseEvent*> (event);
-    if (mouseEvent->buttons () & Qt::LeftButton)
+    if ((mouseEvent->buttons () & Qt::LeftButton ||
+        mouseEvent->buttons () & Qt::RightButton) && !startSelectPos_.isNull ())
     {
       currentSelectPos_ = mouseEvent->pos ();
       ui->label->repaint ();
@@ -79,7 +110,44 @@ bool SelectionDialog::eventFilter(QObject* object, QEvent* event)
       painter.drawRect (selection);
     }
   }
+  else if (event->type () == QEvent::MouseButtonRelease)
+  {
+    QMouseEvent* mouseEvent = static_cast <QMouseEvent*> (event);
+    if (mouseEvent->button () == Qt::LeftButton ||
+        mouseEvent->button () == Qt::RightButton)
+    {
+      if (startSelectPos_.isNull () || currentPixmap_.isNull ())
+      {
+        return QDialog::eventFilter (object, event);
+      }
+      QPoint endPos = mouseEvent->pos ();
+      QRect selection = QRect (startSelectPos_, endPos).normalized ();
+      QPixmap selectedPixmap = currentPixmap_.copy (selection);
+      if (!selectedPixmap.isNull ())
+      {
+        ProcessingItem item;
+        item.source = selectedPixmap;
+        item.screenPos = selection.topLeft ();
 
+        if (mouseEvent->button () == Qt::RightButton &&
+            !languageMenu_->children ().isEmpty ())
+        {
+          QAction* action = languageMenu_->exec (QCursor::pos ());
+          if (action == NULL)
+          {
+            reject ();
+            return QDialog::eventFilter (object, event);
+          }
+          item.ocrLanguage = dictionary_.ocrUiToCode (action->text ());
+          Q_ASSERT (!item.ocrLanguage.isEmpty ());
+          item.sourceLanguage = dictionary_.translateForOcrCode (item.ocrLanguage);
+          Q_ASSERT (!item.sourceLanguage.isEmpty ());
+        }
+        emit selected (item);
+        accept ();
+      }
+    }
+  }
   return QDialog::eventFilter (object, event);
 }
 

SelectionDialog.h

@@ -3,19 +3,21 @@
 
 #include <QDialog>
 #include <QPixmap>
+#include <QMenu>
 
 #include "ProcessingItem.h"
 
 namespace Ui {
   class SelectionDialog;
 }
+class LanguageHelper;
 
 class SelectionDialog : public QDialog
 {
     Q_OBJECT
 
   public:
-    explicit SelectionDialog(QWidget *parent = 0);
+    explicit SelectionDialog(const LanguageHelper& dictionary, QWidget *parent = 0);
     ~SelectionDialog();
 
     bool eventFilter (QObject *object, QEvent *event);
@@ -25,12 +27,15 @@ class SelectionDialog : public QDialog
 
   public slots:
     void setPixmap (QPixmap pixmap);
+    void updateMenu ();
 
   private:
     Ui::SelectionDialog *ui;
+    const LanguageHelper& dictionary_;
     QPoint startSelectPos_;
     QPoint currentSelectPos_;
     QPixmap currentPixmap_;
+    QMenu* languageMenu_;
 };
 
 #endif // SELECTIONDIALOG_H

Translator.cpp

@@ -39,12 +39,14 @@ void Translator::applySettings()
 void Translator::translate(ProcessingItem item)
 {
   Q_ASSERT (!item.recognized.isEmpty ());
-  if (translationLanguage_.isEmpty ())
+  QString sourceLanguage = item.sourceLanguage.isEmpty () ? sourceLanguage_ :
+                                                            item.sourceLanguage;
+  if (translationLanguage_.isEmpty () || sourceLanguage.isEmpty ())
   {
     emit error (tr ("Неверные парметры для перевода."));
     return;
   }
-  QUrl url (translateBaseUrl.arg (item.recognized, sourceLanguage_, translationLanguage_));
+  QUrl url (translateBaseUrl.arg (item.recognized, sourceLanguage, translationLanguage_));
   QNetworkReply* reply = network_.get (QNetworkRequest (url));
   items_.insert (reply, item);
 }