refs #477, allow to detect an invisible dock widget parent by using CEnableForDockWidgetInfoArea for the view base

(by that I can tell if the parent dock widget is visible)

src/blackgui/components/enablefordockwidgetinfoarea.cpp

@@ -9,6 +9,7 @@
 
 #include "enablefordockwidgetinfoarea.h"
 #include "blackgui/guiutility.h"
+#include <QDockWidget>
 
 using namespace BlackGui;
 
@@ -16,7 +17,6 @@ namespace BlackGui
 {
     namespace Components
     {
-
         CEnableForDockWidgetInfoArea::CEnableForDockWidgetInfoArea(CDockWidgetInfoArea *parentInfoArea)
         {
             // it the parent is already an info area at this time, we keep it
@@ -36,6 +36,12 @@ namespace BlackGui
             }
 
             m_parentDockableInfoArea = parentDockableWidget;
+            QMetaObject::Connection con = QDockWidget::connect(parentDockableWidget, &QDockWidget::destroyed, [this]
+            {
+                // break dependency to dockable widget
+                this->m_parentDockableInfoArea = nullptr;
+            });
+            Q_ASSERT_X(con, Q_FUNC_INFO, "Connection failed");
             return true;
         }
 

src/blackgui/components/enablefordockwidgetinfoarea.h

@@ -16,13 +16,13 @@
 #include "blackgui/dockwidgetinfoarea.h"
 #include "blackgui/infoarea.h"
 #include "blackgui/enableforframelesswindow.h"
+#include "blackmisc/qtconnectionlist.h"
 #include <QWidget>
 
 namespace BlackGui
 {
     namespace Components
     {
-
         //! Helper class: If a component is residing in an dockable widget.
         //! This class provides access to its info area and dockable widget.
         class BLACKGUI_EXPORT CEnableForDockWidgetInfoArea
@@ -34,6 +34,9 @@ namespace BlackGui
             //! Corresponding dockable widget in info area
             const BlackGui::CDockWidgetInfoArea *getDockWidgetInfoArea() const { return m_parentDockableInfoArea; }
 
+            //! Has dock area?
+            bool hasDockWidgetArea() const { return m_parentDockableInfoArea; }
+
             //! Corresponding dockable widget in info area
             //! \remarks Usually set from CDockWidgetInfoArea when it is fully initialized
             virtual bool setParentDockWidgetInfoArea(BlackGui::CDockWidgetInfoArea *parentDockableWidget);

src/blackgui/dockwidgetinfoarea.cpp

@@ -97,10 +97,6 @@ namespace BlackGui
         foreach(CEnableForDockWidgetInfoArea * dwia, infoAreaDockWidgets)
         {
             Q_ASSERT_X(dwia, Q_FUNC_INFO, "Missing info area");
-
-            // KWB: potentially a risk when this object is deleted
-            //      but under normal situations the child object will be deleted as well, and we have
-            //      no multi-threaded GUI
             dwia->setParentDockWidgetInfoArea(this);
         }
     }

src/blackgui/dockwidgetinfoarea.h

@@ -61,7 +61,6 @@ namespace BlackGui
 
         //! The parent info areas
         const QList<const CInfoArea *> findParentInfoAreas() const;
-
     };
 
 } // namespace

src/blackgui/views/viewbase.cpp

@@ -257,6 +257,11 @@ namespace BlackGui
         {
             if (!m_enabledLoadIndicator) { return; }
             if (this->m_showingLoadIndicator) { return; }
+            if (this->hasDockWidgetArea())
+            {
+                if (!this->isVisibleWidget()) { return; }
+            }
+
             if (containerSizeDependent >= 0)
             {
                 // really with indicator?

src/blackgui/views/viewbase.h

@@ -12,6 +12,7 @@
 #ifndef BLACKGUI_VIEWBASE_H
 #define BLACKGUI_VIEWBASE_H
 
+#include "blackgui/components/enablefordockwidgetinfoarea.h"
 #include "blackgui/filters/filterdialog.h"
 #include "blackgui/filters/filterwidget.h"
 #include "blackgui/models/modelfilter.h"
@@ -35,7 +36,8 @@ namespace BlackGui
     namespace Views
     {
         //! Non templated base class, allows Q_OBJECT and signals / slots to be used
-        class BLACKGUI_EXPORT CViewBaseNonTemplate : public QTableView
+        class BLACKGUI_EXPORT CViewBaseNonTemplate :
+            public QTableView, public BlackGui::Components::CEnableForDockWidgetInfoArea
         {
             Q_OBJECT