ui: Indexing UI

* Added DialogView with QtDialogView implementation to handle information dialogs
* Implemented QtIndexingDialog class that covers all different dialogs for indexing
* Directly communicate with DialogView from Prpject and all Tasks involved in indexing
* Block QtMainWindow UI while indexing

src/lib_gui/qt/element/QtProgressBar.cpp

@@ -0,0 +1,83 @@
+#include "qt/element/QtProgressBar.h"
+
+#include <QTimer>
+#include <QPainter>
+#include <QPaintEvent>
+#include <QPixmap>
+
+#include "utility/ResourcePaths.h"
+
+QtProgressBar::QtProgressBar(QWidget* parent)
+	: QWidget(parent)
+	, m_percent(0)
+	, m_count(0)
+	, m_pixmap((ResourcePaths::getGuiPath() + "indexing_dialog/progress_bar_element.png").c_str())
+{
+	m_timer = new QTimer(this);
+	connect(m_timer, SIGNAL(timeout()), this, SLOT(animate()));
+
+	m_pixmap.scaleToHeight(20);
+}
+
+void QtProgressBar::showProgress(size_t percent)
+{
+	m_percent = percent;
+
+	stop();
+	show();
+
+	update();
+}
+
+void QtProgressBar::showUnknownProgressAnimated()
+{
+	start();
+	show();
+}
+
+void QtProgressBar::paintEvent(QPaintEvent* event)
+{
+	QPainter painter(this);
+
+	if (m_count)
+	{
+		const QPixmap& pixmap = m_pixmap.pixmap();
+
+		for (int x = -36 + (m_count % 36); x < geometry().width(); x += 18)
+		{
+			painter.drawPixmap(QPointF(x, -5), pixmap);
+		}
+	}
+	else
+	{
+		painter.fillRect(0, 2, geometry().width() * m_percent / 100, 6, "white");
+	}
+}
+
+void QtProgressBar::start()
+{
+	m_timePoint = TimePoint::now();
+	m_timer->start(25);
+}
+
+void QtProgressBar::stop()
+{
+	m_timer->stop();
+	m_count = 0;
+}
+
+void QtProgressBar::animate()
+{
+	TimePoint t = TimePoint::now();
+	size_t dt = t.deltaMS(m_timePoint);
+
+	if (dt < 5)
+	{
+		return;
+	}
+
+	m_timePoint = t;
+	m_count++;
+
+	update();
+}