ui: Add 'close tabs to the right' context menu action to tab bar #822 (#875)

* first try to implement closeTabs toRight.

* removed .kdev4

* signals and slots mechanisms for closeTabstoRight now done correct.

* feature: add option to close tabs to the right on right-click context menu.

* indentation, whitespaces etc.

src/lib_gui/qt/element/QtTabBar.cpp

@@ -1,5 +1,12 @@
 #include "QtTabBar.h"
 
+#include <QContextMenuEvent>
+
+#include "QtContextMenu.h"
+#include "QtGraphicsView.h"
+#include "logging.h"
+
+
 QtTabBar::QtTabBar(QWidget* parent): QTabBar(parent)
 {
 	setFocusPolicy(Qt::NoFocus);
@@ -19,3 +26,22 @@ QSize QtTabBar::minimumTabSizeHint(int index) const
 {
 	return QSize(45, QTabBar::minimumTabSizeHint(index).height());
 }
+
+void QtTabBar::contextMenuEvent(QContextMenuEvent* event)
+{
+	QtContextMenu menu(event, this);
+	QAction * m_closeTabsToRight = new QAction("Close tabs to the right", this);
+	menu.addAction(m_closeTabsToRight);
+
+	connect(m_closeTabsToRight, &QAction::triggered, this, [&]()
+	{
+		// We dont want to close tabs right of the current active tab. 
+		// No, our intend is to close tabs right of the currently hovered tab.
+		auto tabNum = tabAt(event->pos());
+		LOG_INFO("Handling closeTabs... emitting signal to close tabs right of tab nr. " + std::to_string(tabNum));
+		emit signalCloseTabsToRight(tabNum);
+	});
+
+	menu.show();
+	return;
+}

src/lib_gui/qt/element/QtTabBar.h

@@ -5,14 +5,23 @@
 
 class QtTabBar: public QTabBar
 {
+	Q_OBJECT
+    
 public:
 	QtTabBar(QWidget* parent = nullptr);
 
+signals:
+	void signalCloseTabsToRight(int tabNum);
+
 protected:
 	QSize minimumSizeHint() const override;
 
 	QSize tabSizeHint(int index) const override;
 	QSize minimumTabSizeHint(int index) const override;
+
+	// New ContextMenu that lets the user close all tabs to the 
+	// right of current mouse position.
+	void contextMenuEvent(QContextMenuEvent* event) override;
 };
 
 #endif	  // QT_TAB_BAR_H

src/lib_gui/qt/view/QtTabsView.cpp

@@ -54,6 +54,7 @@ QtTabsView::QtTabsView(ViewLayout* viewLayout)
 	layout->addWidget(back);
 
 	connect(addButton, &QPushButton::clicked, this, &QtTabsView::addTab);
+	connect(m_tabBar, &QtTabBar::signalCloseTabsToRight, this, &QtTabsView::closeTabsToRight);
 }
 
 void QtTabsView::createWidgetWrapper()
@@ -271,3 +272,16 @@ void QtTabsView::setStyleSheet()
 	utility::setWidgetBackgroundColor(
 		m_widget, ColorScheme::getInstance()->getColor("tab/bar/background"));
 }
+
+void QtTabsView::closeTabsToRight(int tabNum)
+{
+	LOG_INFO("Closing tabs to the right of tab nr. " + std::to_string(tabNum));
+	// We are closing tabs to the right, hence the increase.
+	tabNum++;  
+	// Now close tabs at position tabNum until count has decreased low enough.
+	while(tabNum < m_tabBar->count() )
+	{
+		m_tabBar->removeTab(tabNum);
+	}
+}
+

src/lib_gui/qt/view/QtTabsView.h

@@ -36,6 +36,7 @@ private slots:
 	void insertTab(bool showTab, SearchMatch match);
 	void changedTab(int index);
 	void removeTab(int index);
+	void closeTabsToRight(int index);
 
 private:
 	void setTabState(int idx, const std::vector<SearchMatch>& matches);