Class view: Fix expanding of items on double click

Task-number: QTCREATORBUG-2536
Change-Id: I94471c265c9f9dbffe253d7c6e8a1e834b47f91f
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/plugins/classview/classviewnavigationwidget.cpp

@@ -40,6 +40,7 @@
 #include <utils/qtcassert.h>
 
 #include <QDebug>
+#include <QVariant>
 #include <QVBoxLayout>
 
 enum { debug = false };
@@ -102,6 +103,7 @@ NavigationWidget::NavigationWidget(QWidget *parent) :
     treeView->setDragEnabled(true);
     treeView->setDragDropMode(QAbstractItemView::DragOnly);
     treeView->setDefaultDropAction(Qt::MoveAction);
+    treeView->setExpandsOnDoubleClick(false);
     verticalLayout->addWidget(Core::ItemViewFind::createSearchableWrapper(
                                   treeView, Core::ItemViewFind::DarkColored,
                                   Core::ItemViewFind::FetchMoreWhileSearching));
@@ -114,6 +116,9 @@ NavigationWidget::NavigationWidget(QWidget *parent) :
     // selected item
     connect(treeView, SIGNAL(activated(QModelIndex)), SLOT(onItemActivated(QModelIndex)));
 
+    // double-clicked item
+    connect(treeView, SIGNAL(doubleClicked(QModelIndex)), SLOT(onItemDoubleClicked(QModelIndex)));
+
     // connections to the manager
     Manager *manager = Manager::instance();
 
@@ -236,6 +241,26 @@ void NavigationWidget::onItemActivated(const QModelIndex &index)
     emit requestGotoLocations(list);
 }
 
+/*!
+    Expands/collapses the item given by \a index if it
+    refers to a project file (.pro/.pri)
+*/
+
+void NavigationWidget::onItemDoubleClicked(const QModelIndex &index)
+{
+    if (!index.isValid())
+        return;
+
+    const QVariant iconType = treeModel->data(index, Constants::IconTypeRole);
+    if (!iconType.isValid())
+        return;
+
+    bool ok = false;
+    const int type = iconType.toInt(&ok);
+    if (ok && type == INT_MIN)
+        treeView->setExpanded(index, !treeView->isExpanded(index));
+}
+
 /*!
     Receives new data for the tree. \a result is a pointer to the Class View
     model root item. The function does nothing if null is passed.

src/plugins/classview/classviewnavigationwidget.h

@@ -72,6 +72,7 @@ signals:
 
 public slots:
     void onItemActivated(const QModelIndex &index);
+    void onItemDoubleClicked(const QModelIndex &index);
 
     void onDataUpdate(QSharedPointer<QStandardItem> result);