ui: Added single file mode to code view

* Added navigation to top of code view for iterating references and switching between list and single file mode
* current file name and reference count is shown on top in single file mode
* refactored scrolling to location or line via request system
* added parameters animated and toTop to scrolling system
* refactored class hierarchy and removed unused stuff in list mode

src/lib_gui/qt/element/QtCodeFileSingle.h

@@ -0,0 +1,78 @@
+#ifndef QT_CODE_FILE_SINGLE_H
+#define QT_CODE_FILE_SINGLE_H
+
+#include <deque>
+#include <map>
+
+#include <QFrame>
+
+#include "utility/TimePoint.h"
+
+#include "qt/element/QtCodeNavigateable.h"
+
+class QLabel;
+class QPushButton;
+class QtCodeArea;
+class QtCodeFileTitleButton;
+class QtCodeNavigator;
+
+class QtCodeFileSingle
+	: public QFrame
+	, public QtCodeNavigateable
+{
+	Q_OBJECT
+
+public:
+	QtCodeFileSingle(QtCodeNavigator* navigator, QWidget* parent = nullptr);
+	virtual ~QtCodeFileSingle();
+
+	void clearCache();
+
+	// QtCodeNaviatebale implementation
+	virtual QAbstractScrollArea* getScrollArea() override;
+
+	virtual void addCodeSnippet(const CodeSnippetParams& params, bool insert = false) override;
+
+	virtual void requestFileContent(const FilePath& filePath) override;
+	virtual bool requestScroll(const FilePath& filePath, uint lineNumber, Id locationId, bool animated, bool onTop) override;
+
+	virtual void updateFiles() override;
+	virtual void showContents() override;
+
+	virtual void onWindowFocus() override;
+
+	const FilePath& getCurrentFilePath() const;
+
+	Id getLocationIdOfFirstActiveLocationOfTokenId(Id tokenId) const;
+
+private:
+	struct FileData
+	{
+		FilePath filePath;
+		TimePoint modificationTime;
+		std::string title;
+
+		std::shared_ptr<QtCodeArea> area;
+	};
+
+	FileData getFileData(const FilePath& filePath) const;
+	void setFileData(const FileData& file);
+
+	void updateRefCount(int refCount);
+
+	QtCodeNavigator* m_navigator;
+
+	QWidget* m_areaWrapper;
+	FilePath m_currentFilePath;
+
+	QtCodeFileTitleButton* m_title;
+	QLabel* m_referenceCount;
+
+	QtCodeArea* m_area;
+	std::map<FilePath, FileData> m_fileDatas;
+	std::deque<FilePath> m_filePaths;
+
+	bool m_contentRequested;
+};
+
+#endif // QT_CODE_FILE_SINGLE_H