From e5f581405e69607a42aec834ad6e51f8d831063a Mon Sep 17 00:00:00 2001
From: Nyall Dawson <nyall.dawson@gmail.com>
Date: Fri, 17 Mar 2017 13:55:31 +1000
Subject: [PATCH] Allow clicking mouse back button on stacked panel widgets

Only works if click occurs outside of widgets - we probably should
start ignoring clicks which aren't left/middle/right in any
mouse event handlers
---
 python/gui/qgspanelwidgetstack.sip | 5 +++++
 src/gui/qgspanelwidgetstack.cpp    | 8 ++++++++
 src/gui/qgspanelwidgetstack.h      | 5 +++++
 3 files changed, 18 insertions(+)

diff --git a/python/gui/qgspanelwidgetstack.sip b/python/gui/qgspanelwidgetstack.sip
index 17566eb0410..c115c6b6bf0 100644
--- a/python/gui/qgspanelwidgetstack.sip
+++ b/python/gui/qgspanelwidgetstack.sip
@@ -89,4 +89,9 @@ class QgsPanelWidgetStack: public QWidget
      * @param panel The panel to close.
      */
     void closePanel( QgsPanelWidget* panel );
+
+  protected:
+
+    void mouseReleaseEvent( QMouseEvent *e );
+
 };
diff --git a/src/gui/qgspanelwidgetstack.cpp b/src/gui/qgspanelwidgetstack.cpp
index a1c0efa8fdb..0d44bd83763 100644
--- a/src/gui/qgspanelwidgetstack.cpp
+++ b/src/gui/qgspanelwidgetstack.cpp
@@ -147,6 +147,14 @@ void QgsPanelWidgetStack::closePanel( QgsPanelWidget *panel )
   this->updateBreadcrumb();
 }
 
+void QgsPanelWidgetStack::mouseReleaseEvent( QMouseEvent *e )
+{
+  if ( e->button() == Qt::BackButton )
+  {
+    acceptCurrentPanel();
+  }
+}
+
 void QgsPanelWidgetStack::updateBreadcrumb()
 {
   QString breadcrumb;
diff --git a/src/gui/qgspanelwidgetstack.h b/src/gui/qgspanelwidgetstack.h
index 079ed098116..bf92d6b340e 100644
--- a/src/gui/qgspanelwidgetstack.h
+++ b/src/gui/qgspanelwidgetstack.h
@@ -117,6 +117,11 @@ class GUI_EXPORT QgsPanelWidgetStack : public QWidget, private Ui::QgsRendererWi
      * @param panel The panel to close.
      */
     void closePanel( QgsPanelWidget *panel );
+
+  protected:
+
+    void mouseReleaseEvent( QMouseEvent *e ) override;
+
   private:
     void updateBreadcrumb();
     QStack<QString> mTitles;