ui: subwindow when resize mainwindow

* disable drop in qtlineedit
    fixes bug where when file is dropped in the lineedit with text,
    the the file will be added as text midst the existing text
* move message to start from script before layout loading so it will load right
(only when started without script on linux)
* center subwindow when mainwindow size changes

setup/Linux/Sourcetrail.sh

@@ -22,5 +22,5 @@ export LD_LIBRARY_PATH="$SOURCETRAIL_PATH/lib:$LD_LIBRARY_PATH"
 export QT_XKB_CONFIG_ROOT="/usr/share/X11/xkb:$QT_XKB_CONFIG_ROOT"
 export QT_QPA_PLATFORM_PLUGIN_PATH="$SOURCETRAIL_PATH/lib/platforms"
 export QT_QPA_FONTDIR="$SOURCETRAIL_PATH/data/fonts:$QT_QPA_FONTDIR"
-export SOURCETRAIL_VIA_SCRIPT
+export SOURCETRAIL_VIA_SCRIPT=1
 exec "$SOURCETRAIL_PATH/Sourcetrail" $@

src/lib_gui/qt/element/QtDirectoryListBox.cpp

@@ -29,6 +29,7 @@ QtListItemWidget::QtListItemWidget(QtDirectoryListBox* list, QListWidgetItem* it
 	m_data->setAttribute(Qt::WA_MacShowFocusRect, 0);
 	m_data->setAttribute(Qt::WA_LayoutUsesWidgetRect); // fixes layouting on Mac
 	m_data->setObjectName("field");
+    m_data->setAcceptDrops(false);
 
 	m_button = new QtIconButton(
 		(ResourcePaths::getGuiPath().str() + "window/dots.png").c_str(),
@@ -72,7 +73,7 @@ void QtListItemWidget::setText(QString text)
 
 void QtListItemWidget::setFocus()
 {
-	m_data->setFocus(Qt::OtherFocusReason);
+    m_data->setFocus(Qt::OtherFocusReason);
 }
 
 void QtListItemWidget::handleButtonPress()

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -101,14 +101,21 @@ QtMainWindow::QtMainWindow()
 	, m_showDockWidgetTitleBars(true)
 	, m_windowStack(this)
 {
-	setObjectName("QtMainWindow");
+    setObjectName("QtMainWindow");
 	setCentralWidget(nullptr);
 	setDockNestingEnabled(true);
 
 	setWindowIcon(QIcon((ResourcePaths::getGuiPath().str() + "icon/logo_1024_1024.png").c_str()));
 	setWindowFlags(Qt::Widget);
 
-	QApplication* app = dynamic_cast<QApplication*>(QCoreApplication::instance());
+#ifdef __linux__
+    if (std::getenv("SOURCETRAIL_VIA_SCRIPT") == nullptr)
+    {
+       QMessageBox::warning(this, "Run Sourcetrail via Script", "Please run Sourcetrail via Sourcetrail.sh");
+    }
+#endif
+
+    QApplication* app = dynamic_cast<QApplication*>(QCoreApplication::instance());
 	app->installEventFilter(new MouseReleaseFilter(this));
 
 	app->setStyleSheet(utility::getStyleSheet(ResourcePaths::getGuiPath().concat(FilePath("main.css"))).c_str());
@@ -125,13 +132,6 @@ QtMainWindow::QtMainWindow()
 	// Need to call loadLayout here for right DockWidget size on Linux
 	// Seconde call is in Application.cpp
 	loadLayout();
-
-#ifdef __linux__
-    if (std::getenv("SOURCETRAIL_VIA_SCRIPT") == nullptr)
-    {
-       QMessageBox::warning(this, "Run Sourcetrail via Script", "Please run Sourcetrail via Sourcetrail.sh");
-    }
-#endif
 }
 
 QtMainWindow::~QtMainWindow()
@@ -323,7 +323,13 @@ void QtMainWindow::closeEvent(QCloseEvent* event)
 	{
 		log->setEnabled(false);
 	}
-	MessageWindowClosed().dispatch();
+    MessageWindowClosed().dispatch();
+}
+
+void QtMainWindow::resizeEvent(QResizeEvent *event)
+{
+    m_windowStack.centerSubWindows();
+    QMainWindow::resizeEvent(event);
 }
 
 void QtMainWindow::about()

src/lib_gui/qt/window/QtMainWindow.h

@@ -78,6 +78,7 @@ protected:
 	void keyPressEvent(QKeyEvent* event);
 	void contextMenuEvent(QContextMenuEvent* event);
 	void closeEvent(QCloseEvent* event);
+    void resizeEvent(QResizeEvent* event) override;
 
 public slots:
 	void about();

src/lib_gui/qt/window/QtWindow.cpp

@@ -73,24 +73,7 @@ QtWindow::QtWindow(bool isSubWindow, QWidget* parent)
 
 	resize(sizeHint());
 
-    if (parentWidget())
-    {
-        if (m_isSubWindow)
-        {
-            move(
-                parentWidget()->width() / 2 - sizeHint().width() / 2,
-                parentWidget()->height() / 2 - sizeHint().height() / 2
-            );
-        }
-        else
-        {
-            move(
-
-                parentWidget()->pos().x() + parentWidget()->width() / 2 - sizeHint().width() / 2,
-                parentWidget()->pos().y() + parentWidget()->height() / 2 - sizeHint().height() / 2
-            );
-        }
-    }
+    moveToCenter();
 
 	this->raise();
 }
@@ -192,7 +175,34 @@ void QtWindow::setScrollAble(bool scrollAble)
 
 bool QtWindow::isScrollAble() const
 {
-	return m_scrollAble;
+    return m_scrollAble;
+}
+
+bool QtWindow::isSubWindow() const
+{
+    return m_isSubWindow;
+}
+
+void QtWindow::moveToCenter()
+{
+    if (parentWidget())
+    {
+        if (m_isSubWindow)
+        {
+            move(
+                parentWidget()->width() / 2 - sizeHint().width() / 2,
+                parentWidget()->height() / 2 - sizeHint().height() / 2
+            );
+        }
+        else
+        {
+            move(
+
+                parentWidget()->pos().x() + parentWidget()->width() / 2 - sizeHint().width() / 2,
+                parentWidget()->pos().y() + parentWidget()->height() / 2 - sizeHint().height() / 2
+            );
+        }
+    }
 }
 
 void QtWindow::updateTitle(QString title)
@@ -485,24 +495,7 @@ void QtWindow::setupDone()
 	QSize size(qMax(actualSize.width(), preferredSize.width()), qMax(actualSize.height(), preferredSize.height()));
 	resize(size);
 
-	if (parentWidget())
-	{
-        if (m_isSubWindow)
-        {
-            move(
-                parentWidget()->width() / 2 - size.width() / 2,
-                parentWidget()->height() / 2 - size.height() / 2
-            );
-        }
-        else
-        {
-            move(
-
-                parentWidget()->pos().x() + parentWidget()->width() / 2 - size.width() / 2,
-                parentWidget()->pos().y() + parentWidget()->height() / 2 - size.height() / 2
-            );
-        }
-    }
+    moveToCenter();
 }
 
 void QtWindow::addLogo()

src/lib_gui/qt/window/QtWindow.h

@@ -30,6 +30,9 @@ public:
 	void setScrollAble(bool scrollAble);
 
 	bool isScrollAble() const;
+    bool isSubWindow() const;
+
+    void moveToCenter();
 
 	void updateTitle(QString title);
 	void updateSubTitle(QString subTitle);
@@ -107,7 +110,7 @@ private:
 	QPoint m_dragPosition;
 	bool m_mousePressedInWindow;
 
-	QSizeGrip* m_sizeGrip;
+    QSizeGrip* m_sizeGrip;
 };
 
 #endif // QT_WINDOW_H

src/lib_gui/qt/window/QtWindowStack.cpp

@@ -1,5 +1,7 @@
 #include "qt/window/QtWindowStack.h"
 
+#include "qt/window/QtWindow.h"
+
 
 QtWindowStackElement::QtWindowStackElement(QWidget* parent)
 	: QWidget(parent)
@@ -71,6 +73,21 @@ void QtWindowStack::popWindow()
 	}
 }
 
+void QtWindowStack::centerSubWindows()
+{
+    for (QtWindowStackElement* window : m_stack)
+    {
+        QtWindow* qtWindow = dynamic_cast<QtWindow*>(window);
+        if (qtWindow)
+        {
+            if (qtWindow->isSubWindow())
+            {
+                qtWindow->moveToCenter();
+            }
+        }
+    }
+}
+
 void QtWindowStack::clearWindows()
 {
 	for (QtWindowStackElement* window : m_stack)

src/lib_gui/qt/window/QtWindowStack.h

@@ -31,7 +31,10 @@ public:
 
 	QtWindowStackElement* getTopWindow();
 	QtWindowStackElement* getBottomWindow();
-	size_t getWindowCount();
+
+    size_t getWindowCount();
+
+    void centerSubWindows();
 
 public slots:
 	void pushWindow(QtWindowStackElement* window);