From ae7b657da35aed2dc8665192f4a13c04e752ca05 Mon Sep 17 00:00:00 2001
From: Matthias Kuhn <matthias@opengis.ch>
Date: Wed, 23 Mar 2016 15:05:37 +0100
Subject: [PATCH] Add a new filter for WritableLayers to QgsMapLayerProxyModel

---
 python/gui/qgsmaplayerproxymodel.sip | 1 +
 src/gui/qgsmaplayerproxymodel.cpp    | 6 +++++-
 src/gui/qgsmaplayerproxymodel.h      | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/python/gui/qgsmaplayerproxymodel.sip b/python/gui/qgsmaplayerproxymodel.sip
index af50cf7d4d0..df12578ded9 100644
--- a/python/gui/qgsmaplayerproxymodel.sip
+++ b/python/gui/qgsmaplayerproxymodel.sip
@@ -20,6 +20,7 @@ class QgsMapLayerProxyModel : QSortFilterProxyModel
       HasGeometry,
       VectorLayer,
       PluginLayer,
+      WritableLayer,
       All
     };
     typedef QFlags<QgsMapLayerProxyModel::Filter> Filters;
diff --git a/src/gui/qgsmaplayerproxymodel.cpp b/src/gui/qgsmaplayerproxymodel.cpp
index 9ae00ea296d..20ba2f96245 100644
--- a/src/gui/qgsmaplayerproxymodel.cpp
+++ b/src/gui/qgsmaplayerproxymodel.cpp
@@ -84,6 +84,11 @@ bool QgsMapLayerProxyModel::filterAcceptsRow( int source_row, const QModelIndex
   if ( mExceptList.contains( layer ) )
     return false;
 
+  QgsVectorLayer* vl = qobject_cast<QgsVectorLayer*>( layer );
+
+  if ( mFilters.testFlag( WritableLayer ) && layer->readOnly() )
+    return false;
+
   // layer type
   if (( mFilters.testFlag( RasterLayer ) && layer->type() == QgsMapLayer::RasterLayer ) ||
       ( mFilters.testFlag( VectorLayer ) && layer->type() == QgsMapLayer::VectorLayer ) ||
@@ -98,7 +103,6 @@ bool QgsMapLayerProxyModel::filterAcceptsRow( int source_row, const QModelIndex
                         mFilters.testFlag( HasGeometry );
   if ( detectGeometry && layer->type() == QgsMapLayer::VectorLayer )
   {
-    QgsVectorLayer* vl = dynamic_cast<QgsVectorLayer*>( layer );
     if ( vl )
     {
       if ( mFilters.testFlag( HasGeometry ) && vl->hasGeometryType() )
diff --git a/src/gui/qgsmaplayerproxymodel.h b/src/gui/qgsmaplayerproxymodel.h
index 89e047ae04e..41ac94a3938 100644
--- a/src/gui/qgsmaplayerproxymodel.h
+++ b/src/gui/qgsmaplayerproxymodel.h
@@ -46,6 +46,7 @@ class GUI_EXPORT QgsMapLayerProxyModel : public QSortFilterProxyModel
       HasGeometry = PointLayer | LineLayer | PolygonLayer,
       VectorLayer = NoGeometry | HasGeometry,
       PluginLayer = 32,
+      WritableLayer = 64,
       All = RasterLayer | VectorLayer | PluginLayer
     };
     Q_DECLARE_FLAGS( Filters, Filter )