ui: Improved code view UI

* reduced minimized file state to one-colored block
* added hover states to file buttons
* show hover state when hovering title bar
* fixed file button use for overview stats snippet

src/lib_gui/qt/element/QtIconButton.cpp

@@ -1,7 +1,34 @@
 #include "qt/element/QtIconButton.h"
 
+#include <QEvent>
+
 #include "qt/utility/utilityQt.h"
 
+
+QtHoverButton::QtHoverButton(QWidget* parent)
+	: QPushButton("", parent)
+{
+	setAttribute(Qt::WA_LayoutUsesWidgetRect); // fixes layouting on Mac
+	setMouseTracking(true);
+}
+
+void QtHoverButton::enterEvent(QEvent *event)
+{
+	if (isEnabled())
+	{
+		emit hoveredIn(this);
+	}
+}
+
+void QtHoverButton::leaveEvent(QEvent *event)
+{
+	if (isEnabled())
+	{
+		emit hoveredOut(this);
+	}
+}
+
+
 QtIconButton::QtIconButton(QString iconPath, QString hoveredIconPath, QWidget* parent)
 	: QPushButton("", parent)
 	, m_iconPath(iconPath)
@@ -50,3 +77,106 @@ void QtIconButton::setIconFromPath(QString path)
 
 	setIcon(QIcon(pixmap));
 }
+
+
+QtIconStateButton::QtIconStateButton(QWidget* parent)
+	: QPushButton("", parent)
+{
+	setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+	setAttribute(Qt::WA_LayoutUsesWidgetRect); // fixes layouting on Mac
+	setMouseTracking(true);
+
+	setObjectName("iconStateButton");
+
+	leaveEvent(nullptr);
+}
+
+void QtIconStateButton::addState(ButtonState buttonState, QString iconPath, QColor color)
+{
+	State state;
+	state.iconPath = iconPath;
+	state.color = color;
+	m_states.emplace(buttonState, state);
+
+	if (buttonState == STATE_DEFAULT)
+	{
+		leaveEvent(nullptr);
+	}
+}
+
+void QtIconStateButton::hoverIn()
+{
+	enterEvent(nullptr);
+}
+
+void QtIconStateButton::hoverOut()
+{
+	leaveEvent(nullptr);
+}
+
+void QtIconStateButton::changeEvent(QEvent *event)
+{
+	if (event->type() != QEvent::EnabledChange)
+	{
+		return;
+	}
+
+	auto it = m_states.find(isEnabled() ? STATE_DEFAULT : STATE_DISABLED);
+	if (it != m_states.end())
+	{
+		setState(it->second);
+	}
+}
+
+void QtIconStateButton::enterEvent(QEvent *event)
+{
+	if (!isEnabled())
+	{
+		return;
+	}
+
+	auto it = m_states.find(STATE_HOVERED);
+	if (it != m_states.end())
+	{
+		setState(it->second);
+
+		if (event)
+		{
+			emit hoveredIn(this);
+		}
+	}
+}
+
+void QtIconStateButton::leaveEvent(QEvent *event)
+{
+	if (!isEnabled())
+	{
+		return;
+	}
+
+	auto it = m_states.find(STATE_DEFAULT);
+	if (it != m_states.end())
+	{
+		setState(it->second);
+
+		if (event)
+		{
+			emit hoveredOut(this);
+		}
+	}
+}
+
+void QtIconStateButton::setState(State state)
+{
+	QPixmap pixmap = QPixmap(state.iconPath);
+
+	if (state.color != Qt::transparent)
+	{
+		pixmap = utility::colorizePixmap(pixmap, state.color);
+	}
+
+	QIcon icon(pixmap);
+	icon.addPixmap(pixmap, QIcon::Disabled);
+
+	setIcon(icon);
+}