ticket:5128 Added drag and drop for text layer

Belonging to [master]:
  - #138

OMEdit/OMEdit/OMEditGUI/Editors/BaseEditor.cpp

@@ -1811,6 +1811,45 @@ QMimeData* PlainTextEdit::createMimeDataFromSelection() const
   return 0;
 }
 
+/*!
+ * \brief PlainTextEdit::canInsertFromMimeData
+ * Reimplementation of QPlainTextEdit::canInsertFromMimeData.\n
+ * Checks the QMimeData format and return true if the format is allowed.
+ * \param source
+ * \return
+ */
+bool PlainTextEdit::canInsertFromMimeData(const QMimeData *source) const
+{
+  // check mimeData to see if we can insert from it
+  if (source->hasFormat(Helper::modelicaComponentFormat)) {
+    return mpBaseEditor->getModelWidget() && !mpBaseEditor->getModelWidget()->getLibraryTreeItem()->isSystemLibrary();
+  } else {
+    return QPlainTextEdit::canInsertFromMimeData(source);
+  }
+}
+
+/*!
+ * \brief PlainTextEdit::insertFromMimeData
+ * Checks the QMimeData format and performs a specific operation.
+ * \param source
+ */
+void PlainTextEdit::insertFromMimeData(const QMimeData *source)
+{
+  if (source->hasFormat(Helper::modelicaComponentFormat)) {
+    QByteArray itemData = source->data(Helper::modelicaComponentFormat);
+    QDataStream dataStream(&itemData, QIODevice::ReadOnly);
+    QString className;
+    dataStream >> className;
+    textCursor().insertFragment(QTextDocumentFragment::fromPlainText(className));
+    ensureCursorVisible();
+    setFocus(Qt::ActiveWindowFocusReason);
+  } else if (source->hasFormat(Helper::modelicaFileFormat)) {
+    MainWindow::instance()->openDroppedFile(source);
+  } else {
+    QPlainTextEdit::insertFromMimeData(source);
+  }
+}
+
 /*!
  * \brief PlainTextEdit::focusInEvent
  * Reimplementation of QPlainTextEdit::focusInEvent(). Stops the auto save timer.

OMEdit/OMEdit/OMEditGUI/Editors/BaseEditor.h

@@ -307,6 +307,8 @@ public slots:
   virtual void resizeEvent(QResizeEvent *pEvent);
   virtual void keyPressEvent(QKeyEvent *pEvent);
   virtual QMimeData* createMimeDataFromSelection() const;
+  virtual bool canInsertFromMimeData(const QMimeData *source) const;
+  virtual void insertFromMimeData(const QMimeData *source);
   virtual void focusInEvent(QFocusEvent *event);
   virtual void focusOutEvent(QFocusEvent *event);
   void paintEvent(QPaintEvent *e);

OMEdit/OMEdit/OMEditGUI/MainWindow.cpp

@@ -604,15 +604,15 @@ void MainWindow::beforeClosingMainWindow()
 /*!
  * \brief MainWindow::openDroppedFile
  * Opens the dropped file.
- * \param event
+ * \param pMimeData
  */
-void MainWindow::openDroppedFile(QDropEvent *event)
+void MainWindow::openDroppedFile(const QMimeData *pMimeData)
 {
   int progressValue = 0;
-  mpProgressBar->setRange(0, event->mimeData()->urls().size());
+  mpProgressBar->setRange(0, pMimeData->urls().size());
   showProgressBar();
   //retrieves the filenames of all the dragged files in list and opens the valid files.
-  foreach (QUrl fileUrl, event->mimeData()->urls()) {
+  foreach (QUrl fileUrl, pMimeData->urls()) {
     QFileInfo fileInfo(fileUrl.toLocalFile());
     // show file loading message
     mpStatusBar->showMessage(QString(Helper::loading).append(": ").append(fileInfo.absoluteFilePath()));
@@ -4373,7 +4373,7 @@ void MainWindow::dropEvent(QDropEvent *event)
     event->ignore();
     return;
   }
-  openDroppedFile(event);
+  openDroppedFile(event->mimeData());
   event->accept();
 }
 

OMEdit/OMEdit/OMEditGUI/MainWindow.h

@@ -51,6 +51,7 @@ extern "C" {
 #include <QMainWindow>
 #include <QDialog>
 #include <QProgressBar>
+#include <QMimeData>
 #include <QDomDocument>
 #include <QStackedWidget>
 #include <QActionGroup>
@@ -207,7 +208,7 @@ class MainWindow : public QMainWindow
   void closeEvent(QCloseEvent *event);
   int askForExit();
   void beforeClosingMainWindow();
-  void openDroppedFile(QDropEvent *event);
+  void openDroppedFile(const QMimeData *pMimeData);
   void openResultFiles(QStringList fileNames);
   void simulate(LibraryTreeItem *pLibraryTreeItem);
   void simulateWithTransformationalDebugger(LibraryTreeItem *pLibraryTreeItem);

OMEdit/OMEdit/OMEditGUI/Modeling/ModelWidgetContainer.cpp

@@ -2138,7 +2138,7 @@ void GraphicsView::dropEvent(QDropEvent *event)
     event->ignore();
     return;
   } else if (event->mimeData()->hasFormat(Helper::modelicaFileFormat)) {
-    pMainWindow->openDroppedFile(event);
+    pMainWindow->openDroppedFile(event->mimeData());
     event->accept();
   } else if (event->mimeData()->hasFormat(Helper::modelicaComponentFormat)) {
     // check if the class is system library
@@ -6688,8 +6688,12 @@ bool ModelWidgetContainer::eventFilter(QObject *object, QEvent *event)
   /* If focus is set to LibraryTreeView, DocumentationViewer, QMenuBar etc. then try to validate the text because user might have
    * updated the text manually.
    */
+  /* Don't check LibraryTreeView focus since now OMEdit supports drag and drop of classnames on text view See ticket:5128
+   * The user is expected to click on LibraryTreeView and drag items on the working text view which might be invalid.
+   * So we don't want to validate text in that case.
+   */
   if ((event->type() == QEvent::MouseButtonPress && qobject_cast<QMenuBar*>(object)) ||
-      (event->type() == QEvent::FocusIn && (qobject_cast<LibraryTreeView*>(object) || qobject_cast<DocumentationViewer*>(object)))) {
+      (event->type() == QEvent::FocusIn && qobject_cast<DocumentationViewer*>(object))) {
     ModelWidget *pModelWidget = getCurrentModelWidget();
     if (pModelWidget && pModelWidget->getLibraryTreeItem()) {
       LibraryTreeItem *pLibraryTreeItem = pModelWidget->getLibraryTreeItem();