From 51c6d8af5cab67482b46ef4b624ae3c182a1bb68 Mon Sep 17 00:00:00 2001
From: Martin Dobias <wonder.sk@gmail.com>
Date: Wed, 29 Jun 2016 18:16:08 +0200
Subject: [PATCH] Add notification in case a map tool does notthing (fixes
 #15160)

---
 src/app/nodetool/qgsmaptoolnodetool.cpp | 2 +-
 src/app/qgsmaptooloffsetcurve.cpp       | 4 ++++
 src/app/qgsmaptoolrotatefeature.cpp     | 1 +
 src/app/qgsmaptoolsimplify.cpp          | 6 ++++++
 4 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/app/nodetool/qgsmaptoolnodetool.cpp b/src/app/nodetool/qgsmaptoolnodetool.cpp
index 1601f4441495..427c3d9fb1b6 100644
--- a/src/app/nodetool/qgsmaptoolnodetool.cpp
+++ b/src/app/nodetool/qgsmaptoolnodetool.cpp
@@ -228,7 +228,7 @@ void QgsMapToolNodeTool::canvasPressEvent( QgsMapMouseEvent* e )
       QgsFeature feature = getFeatureAtPoint( e );
       if ( !feature.constGeometry() )
       {
-        emit messageEmitted( tr( "could not snap to a segment on the current layer." ) );
+        emit messageEmitted( tr( "Could not snap to a feature in the current layer." ) );
         return;
       }
       else
diff --git a/src/app/qgsmaptooloffsetcurve.cpp b/src/app/qgsmaptooloffsetcurve.cpp
index e8dd57161381..16f4cbd6b1e6 100644
--- a/src/app/qgsmaptooloffsetcurve.cpp
+++ b/src/app/qgsmaptooloffsetcurve.cpp
@@ -119,6 +119,10 @@ void QgsMapToolOffsetCurve::canvasReleaseEvent( QgsMapMouseEvent* e )
         createDistanceWidget();
       }
     }
+    else
+    {
+      emit messageEmitted( tr( "Could not find a nearby feature in any vector layer." ) );
+    }
     return;
   }
 
diff --git a/src/app/qgsmaptoolrotatefeature.cpp b/src/app/qgsmaptoolrotatefeature.cpp
index 1492f790f27d..5947cdef9abb 100644
--- a/src/app/qgsmaptoolrotatefeature.cpp
+++ b/src/app/qgsmaptoolrotatefeature.cpp
@@ -257,6 +257,7 @@ void QgsMapToolRotateFeature::canvasReleaseEvent( QgsMapMouseEvent* e )
 
       if ( minDistance == std::numeric_limits<double>::max() )
       {
+        emit messageEmitted( tr( "Could not find a nearby feature in the current layer." ) );
         return;
       }
 
diff --git a/src/app/qgsmaptoolsimplify.cpp b/src/app/qgsmaptoolsimplify.cpp
index 4203173ed3b9..15fa604a5c07 100644
--- a/src/app/qgsmaptoolsimplify.cpp
+++ b/src/app/qgsmaptoolsimplify.cpp
@@ -257,6 +257,12 @@ void QgsMapToolSimplify::canvasReleaseEvent( QgsMapMouseEvent* e )
 
   mDragging = false;
 
+  if ( mSelectedFeatures.isEmpty() )
+  {
+    emit messageEmitted( tr( "Could not find a nearby feature in the current layer." ) );
+    return;
+  }
+
   // count vertices, prepare rubber bands
   mOriginalVertexCount = 0;
   Q_FOREACH ( const QgsFeature& f, mSelectedFeatures )