From 87b0596ebcda61e7f827c3d9fc9b96883a58d8c9 Mon Sep 17 00:00:00 2001
From: Rodrigo Oliva <loger9@gmail.com>
Date: Mon, 11 Oct 2021 20:33:56 +0200
Subject: [PATCH] Add feature to close tabs with the middle mouse button.
 (#360)

Co-authored-by: Rodrigo Oliva <Rodrigo.Oliva@king.com>
---
 demo/MainWindow.cpp   |  3 +++
 src/DockManager.h     |  1 +
 src/DockWidgetTab.cpp | 32 +++++++++++++++++++++++++-------
 3 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/demo/MainWindow.cpp b/demo/MainWindow.cpp
index c8b323b..9745755 100644
--- a/demo/MainWindow.cpp
+++ b/demo/MainWindow.cpp
@@ -630,6 +630,9 @@ CMainWindow::CMainWindow(QWidget *parent) :
 	// uncomment if you would like to enable an equal distribution of the
 	// available size of a splitter to all contained dock widgets
 	// CDockManager::setConfigFlag(CDockManager::EqualSplitOnInsertion, true);
+	
+	// uncomment if you would like to close tabs with the middle mouse button, web browser style
+	// CDockManager::setConfigFlag(CDockManager::MiddleMouseButtonClosesTab, true);
 
 	// Now create the dock manager and its content
 	d->DockManager = new CDockManager(this);
diff --git a/src/DockManager.h b/src/DockManager.h
index 5941ea7..d549a68 100644
--- a/src/DockManager.h
+++ b/src/DockManager.h
@@ -195,6 +195,7 @@ public:
         FloatingContainerForceQWidgetTitleBar = 0x1000000,//!< Linux only ! Forces all FloatingContainer to use a QWidget based title bar.
 														 //!< If neither this nor FloatingContainerForceNativeTitleBar is set (the default) native titlebars are used except on known bad systems.
 														 //! Users can overwrite this by setting the environment variable ADS_UseNativeTitle to "1" or "0".
+		MiddleMouseButtonClosesTab = 0x2000000, //! If the flag is set, the user can use the mouse middle button to close the tab under the mouse
 
         DefaultDockAreaButtons = DockAreaHasCloseButton
 							   | DockAreaHasUndockButton
diff --git a/src/DockWidgetTab.cpp b/src/DockWidgetTab.cpp
index 9eaa911..968bb6f 100644
--- a/src/DockWidgetTab.cpp
+++ b/src/DockWidgetTab.cpp
@@ -392,16 +392,30 @@ void CDockWidgetTab::mouseReleaseEvent(QMouseEvent* ev)
 			// End of tab moving, emit signal
 			if (d->DockArea)
 			{
+				ev->accept();
                 Q_EMIT moved(internal::globalPositionOf(ev));
 			}
 			break;
 
 		case DraggingFloatingWidget:
+			 ev->accept();
 			 d->FloatingWidget->finishDragging();
 			 break;
 
 		default:; // do nothing
 		}
+	} 
+	else if (ev->button() == Qt::MiddleButton)
+	{
+		if (CDockManager::testConfigFlag(CDockManager::MiddleMouseButtonClosesTab))
+		{
+			// Only attempt to close if the mouse is still
+			// on top of the widget, to allow the user to cancel.
+			if (rect().contains(mapFromGlobal(QCursor::pos()))) {
+				ev->accept();
+				Q_EMIT closeRequested();
+			}
+		}
 	}
 
 	Super::mouseReleaseEvent(ev);
@@ -628,14 +642,18 @@ QString CDockWidgetTab::text() const
 //============================================================================
 void CDockWidgetTab::mouseDoubleClickEvent(QMouseEvent *event)
 {
-	// If this is the last dock area in a dock container it does not make
-	// sense to move it to a new floating widget and leave this one
-	// empty
-	if ((!d->DockArea->dockContainer()->isFloating() || d->DockArea->dockWidgetsCount() > 1)
-		&& d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
+	if (event->button() == Qt::LeftButton) 
 	{
-        d->saveDragStartMousePosition(internal::globalPositionOf(event));
-		d->startFloating(DraggingInactive);
+		// If this is the last dock area in a dock container it does not make
+		// sense to move it to a new floating widget and leave this one
+		// empty
+		if ((!d->DockArea->dockContainer()->isFloating() || d->DockArea->dockWidgetsCount() > 1)
+			&& d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
+		{
+			event->accept();
+			d->saveDragStartMousePosition(internal::globalPositionOf(event));
+			d->startFloating(DraggingInactive);
+		}
 	}
 
 	Super::mouseDoubleClickEvent(event);