3 files changed, 22 insertions, 4 deletions
diff --git a/application/MainWindow.cpp b/application/MainWindow.cpp
index 1db09c6c..8457cd41 100644
--- a/application/MainWindow.cpp
+++ b/application/MainWindow.cpp
@@ -682,6 +682,10 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new MainWindow
         connect(proxymodel, &InstanceProxyModel::dataChanged, this, &MainWindow::instanceDataChanged);
 
         view->setModel(proxymodel);
+        view->setSourceOfGroupCollapseStatus([](const QString & groupName)->bool {
+            return MMC->instances()->isGroupCollapsed(groupName);
+        });
+        connect(view, &GroupView::groupStateChanged, MMC->instances().get(), &InstanceList::on_GroupStateChanged);
         ui->horizontalLayout->addWidget(view);
     }
     // The cat background
diff --git a/application/groupview/GroupView.cpp b/application/groupview/GroupView.cpp
index bc7ef6c0..ff0daee4 100644
--- a/application/groupview/GroupView.cpp
+++ b/application/groupview/GroupView.cpp
@@ -175,6 +175,9 @@ void GroupView::updateGeometries()
             else
             {
                 auto cat = new VisualGroup(groupName, this);
+                if(fVisibility) {
+                    cat->collapsed = fVisibility(groupName);
+                }
                 cats.insert(groupName, cat);
                 cat->update();
             }
@@ -384,6 +387,8 @@ void GroupView::mouseReleaseEvent(QMouseEvent *event)
         if (state() == ExpandingState)
         {
             m_pressedCategory->collapsed = false;
+            emit groupStateChanged(m_pressedCategory->text, false);
+
             updateGeometries();
             viewport()->update();
             event->accept();
@@ -392,6 +397,8 @@ void GroupView::mouseReleaseEvent(QMouseEvent *event)
         else if (state() == CollapsingState)
         {
             m_pressedCategory->collapsed = true;
+            emit groupStateChanged(m_pressedCategory->text, true);
+
             updateGeometries();
             viewport()->update();
             event->accept();
@@ -607,8 +614,7 @@ void GroupView::dropEvent(QDropEvent *event)
             const QString categoryText = category->text;
             if (model()->dropMimeData(event->mimeData(), Qt::MoveAction, row, 0, QModelIndex()))
             {
-                model()->setData(model()->index(row, 0), categoryText,
-                                GroupViewRoles::GroupRole);
+                model()->setData(model()->index(row, 0), categoryText, GroupViewRoles::GroupRole);
                 event->setDropAction(Qt::MoveAction);
                 event->accept();
             }
diff --git a/application/groupview/GroupView.h b/application/groupview/GroupView.h
index db29a0d4..13bfd234 100644
--- a/application/groupview/GroupView.h
+++ b/application/groupview/GroupView.h
@@ -20,6 +20,7 @@
 #include <QScrollBar>
 #include <QCache>
 #include "VisualGroup.h"
+#include <functional>
 
 struct GroupViewRoles
 {
@@ -41,6 +42,11 @@ public:
 
     void setModel(QAbstractItemModel *model) override;
 
+    using visibilityFunction = std::function<bool(const QString &)>;
+    void setSourceOfGroupCollapseStatus(visibilityFunction f) {
+        fVisibility = f;
+    }
+
     /// return geometry rectangle occupied by the specified model item
     QRect geometryRect(const QModelIndex &index) const;
     /// return visual rectangle occupied by the specified model item
@@ -48,8 +54,7 @@ public:
     /// get the model index at the specified visual point
     virtual QModelIndex indexAt(const QPoint &point) const override;
     QString groupNameAt(const QPoint &point);
-    void setSelection(const QRect &rect,
-                      const QItemSelectionModel::SelectionFlags commands) override;
+    void setSelection(const QRect &rect, const QItemSelectionModel::SelectionFlags commands) override;
 
     virtual int horizontalOffset() const override;
     virtual int verticalOffset() const override;
@@ -80,6 +85,7 @@ protected slots:
 
 signals:
     void droppedURLs(QList<QUrl> urls);
+    void groupStateChanged(QString group, bool collapsed);
 
 protected:
     virtual bool isIndexHidden(const QModelIndex &index) const override;
@@ -103,6 +109,8 @@ private:
     friend struct VisualGroup;
     QList<VisualGroup *> m_groups;
 
+    visibilityFunction fVisibility;
+
     // geometry
     int m_leftMargin = 5;
     int m_rightMargin = 5;