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/QtCodeNavigateable.cpp

@@ -0,0 +1,103 @@
+#include "qt/element/QtCodeNavigateable.h"
+
+#include <QPropertyAnimation>
+#include <QScrollArea>
+#include <QScrollBar>
+
+QtCodeNavigateable::~QtCodeNavigateable()
+{
+}
+
+void QtCodeNavigateable::ensureWidgetVisibleAnimated(
+	QWidget* parentWidget, QWidget *childWidget, QRectF rect, bool animated, bool onTop)
+{
+	QAbstractScrollArea* area = getScrollArea();
+	if (!area || !parentWidget->isAncestorOf(childWidget))
+	{
+		return;
+	}
+
+	const QRect microFocus = childWidget->inputMethodQuery(Qt::ImCursorRectangle).toRect();
+	const QRect defaultMicroFocus = childWidget->QWidget::inputMethodQuery(Qt::ImCursorRectangle).toRect();
+	QRect focusRect = (microFocus != defaultMicroFocus)
+		? QRect(childWidget->mapTo(parentWidget, microFocus.topLeft()), microFocus.size())
+		: QRect(childWidget->mapTo(parentWidget, QPoint(0, 0)), childWidget->size());
+	const QRect visibleRect(-parentWidget->pos(), area->viewport()->size());
+
+	if (rect.height() > 0)
+	{
+		focusRect = QRect(childWidget->mapTo(parentWidget, rect.topLeft().toPoint()), rect.size().toSize());
+		focusRect.adjust(0, 0, 0, 100);
+	}
+
+	QScrollBar* scrollBar = area->verticalScrollBar();
+	int value = focusRect.center().y() - visibleRect.center().y();
+
+	if (onTop)
+	{
+		value = focusRect.top() - visibleRect.top();
+	}
+
+	if (scrollBar && (value > 50 || value < -50))
+	{
+		if (animated)
+		{
+			QPropertyAnimation* anim = new QPropertyAnimation(scrollBar, "value");
+			anim->setDuration(300);
+			anim->setStartValue(scrollBar->value());
+			anim->setEndValue(scrollBar->value() + value);
+			anim->setEasingCurve(QEasingCurve::InOutQuad);
+			anim->start();
+		}
+		else
+		{
+			scrollBar->setValue(scrollBar->value() + value);
+		}
+	}
+}
+
+void QtCodeNavigateable::ensurePercentVisibleAnimated(double percent, bool animated, bool onTop)
+{
+	QAbstractScrollArea* area = getScrollArea();
+	if (!area)
+	{
+		return;
+	}
+
+	int totalHeight = area->sizeHint().height();
+	int visibleHeight = area->viewport()->height();
+	int scrollableHeight = totalHeight - visibleHeight;
+	if (scrollableHeight < 0)
+	{
+		return;
+	}
+
+	int scrollHeight = totalHeight * percent;
+	if (!onTop)
+	{
+		scrollHeight -= visibleHeight / 3;
+	}
+	else
+	{
+		scrollHeight -= 20;
+	}
+
+	QScrollBar* scrollBar = area->verticalScrollBar();
+	double scrollFactor = double(scrollBar->maximum()) / scrollableHeight;
+
+	int value = scrollHeight * scrollFactor;
+
+	if (animated)
+	{
+		QPropertyAnimation* anim = new QPropertyAnimation(scrollBar, "value");
+		anim->setDuration(300);
+		anim->setStartValue(scrollBar->value());
+		anim->setEndValue(value);
+		anim->setEasingCurve(QEasingCurve::InOutQuad);
+		anim->start();
+	}
+	else
+	{
+		scrollBar->setValue(value);
+	}
+}