LP-567 store/restore tree expansion state

ground/gcs/src/plugins/uavobjectbrowser/uavobjectbrowser.cpp

@@ -55,6 +55,17 @@ void UAVObjectBrowser::loadConfiguration(IUAVGadgetConfiguration *config)
     m_widget->setSplitterState(m->splitterState());
 }
 
+void UAVObjectBrowser::saveState(QSettings &settings) const
+{
+    m_widget->saveState(settings);
+}
+
+
+void UAVObjectBrowser::restoreState(QSettings &settings)
+{
+    m_widget->restoreState(settings);
+}
+
 void UAVObjectBrowser::viewOptionsChangedSlot(bool categorized, bool scientific, bool metadata, bool description)
 {
     if (m_config) {

ground/gcs/src/plugins/uavobjectbrowser/uavobjectbrowser.h

@@ -51,6 +51,9 @@ public:
     }
     void loadConfiguration(IUAVGadgetConfiguration *config);
 
+    void saveState(QSettings &settings) const;
+    void restoreState(QSettings &settings);
+
 private slots:
     void viewOptionsChangedSlot(bool categorized, bool scientific, bool metadata, bool description);
     void splitterChanged(QByteArray state);

ground/gcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.cpp

@@ -422,6 +422,68 @@ void UAVObjectBrowserWidget::searchLineChanged(QString searchText)
     }
 }
 
+QString UAVObjectBrowserWidget::indexToPath(const QModelIndex &index) const
+{
+    QString path = index.data(Qt::DisplayRole).toString();
+
+    QModelIndex parent = index.parent();
+
+    while (parent.isValid()) {
+        path   = parent.data(Qt::DisplayRole).toString() + "/" + path;
+        parent = parent.parent();
+    }
+    return path;
+}
+
+QModelIndex UAVObjectBrowserWidget::indexFromPath(const QString &path) const
+{
+    QStringList list  = path.split("/");
+
+    QModelIndex index = m_modelProxy->index(0, 0);
+
+    foreach(QString name, list) {
+        QModelIndexList items = m_modelProxy->match(index, Qt::DisplayRole, name, 1, Qt::MatchFlags(Qt::MatchExactly | Qt::MatchRecursive));
+
+        if (!items.isEmpty()) {
+            index = items.first();
+        } else {
+            // bail out
+            return QModelIndex();
+        }
+    }
+    return index;
+}
+
+void UAVObjectBrowserWidget::saveState(QSettings &settings) const
+{
+    QStringList list;
+
+    // prepare list
+    foreach(QModelIndex index, m_modelProxy->getPersistentIndexList()) {
+        if (m_browser->treeView->isExpanded(index)) {
+            QString path = indexToPath(index);
+            list << path;
+        }
+    }
+
+    // save list
+    settings.setValue("expandedItems", QVariant::fromValue(list));
+}
+
+void UAVObjectBrowserWidget::restoreState(QSettings &settings)
+{
+    // get list
+    QStringList list = settings.value("expandedItems").toStringList();
+
+    foreach(QString path, list) {
+        QModelIndex index = indexFromPath(path);
+
+        if (index.isValid()) {
+            m_browser->treeView->setExpanded(index, true);
+        }
+    }
+}
+
 void UAVObjectBrowserWidget::searchTextCleared()
 {
     m_browser->searchLine->clear();

ground/gcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.h

@@ -46,6 +46,12 @@ class TreeSortFilterProxyModel : public QSortFilterProxyModel {
 public:
     TreeSortFilterProxyModel(QObject *parent);
 
+public:
+    QModelIndexList getPersistentIndexList() const
+    {
+        return persistentIndexList();
+    }
+
 protected:
     bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const;
     bool filterAcceptsRowItself(int source_row, const QModelIndex &source_parent) const;
@@ -87,6 +93,12 @@ public:
     void setViewOptions(bool showCategories, bool showMetadata, bool useScientificNotation, bool showDescription);
     void setSplitterState(QByteArray state);
 
+    void saveState(QSettings &settings) const;
+    void restoreState(QSettings &settings);
+
+    QString indexToPath(const QModelIndex &index) const;
+    QModelIndex indexFromPath(const QString &path) const;
+
 public slots:
     void showDescription(bool show);