Editor: update pathgrid creator input on changes

When data changes the cell input for pathgrid creator is repopulated
with valid choices. This handles the case where a cell is added or
removed, and also when a cell's pathgrid is added or completely
removed.

apps/opencs/view/world/pathgridcreator.cpp

@@ -33,22 +33,9 @@ CSVWorld::PathgridCreator::PathgridCreator(
     mCell->setModel(proxyModel);
     insertBeforeButtons(mCell, true);
 
-    // Populate combo box with cells that don't have a pathgrid yet.
-    const CSMWorld::IdCollection<CSMWorld::Pathgrid>& pathgrids = getData().getPathgrids();
-    const CSMWorld::IdCollection<CSMWorld::Cell>& cells = getData().getCells();
-    const int cellCount = cells.getSize();
-    for (int i = 0; i < cellCount; ++i)
-    {
-        std::string cellId = cells.getId(i);
-        if (pathgrids.searchId(cellId) == -1)
-        {
-            mCell->addItem(QString::fromStdString(cellId));
-        }
-    }
-
-    mCell->model()->sort(0);
-    mCell->setCurrentIndex(0);
+    setupCellsInput();
 
+    connect(&getData(), SIGNAL (idListChanged()), this, SLOT (setupCellsInput()));
     connect(mCell, SIGNAL (currentIndexChanged(const QString&)), this, SLOT (cellChanged()));
 }
 
@@ -91,3 +78,24 @@ void CSVWorld::PathgridCreator::cellChanged()
 {
     update();
 }
+
+void CSVWorld::PathgridCreator::setupCellsInput()
+{
+    mCell->clear();
+
+    // Populate combo box with cells that don't have a pathgrid yet.
+    const CSMWorld::IdCollection<CSMWorld::Pathgrid>& pathgrids = getData().getPathgrids();
+    const CSMWorld::IdCollection<CSMWorld::Cell>& cells = getData().getCells();
+    const int cellCount = cells.getSize();
+    for (int i = 0; i < cellCount; ++i)
+    {
+        std::string cellId = cells.getId(i);
+        if (pathgrids.searchId(cellId) == -1)
+        {
+            mCell->addItem(QString::fromStdString(cellId));
+        }
+    }
+
+    mCell->model()->sort(0);
+    mCell->setCurrentIndex(0);
+}

apps/opencs/view/world/pathgridcreator.hpp

@@ -40,6 +40,9 @@ namespace CSVWorld
 
             /// \brief Check user input for errors.
             void cellChanged();
+
+            /// \brief Setup cells in combo box.
+            void setupCellsInput();
     };
 }