delete Layer

delete Layer, delete active Layer, protect against false input

src/Painting/Layer/PaintingArea.cpp

@@ -76,6 +76,11 @@ void PaintingArea::deleteLayer(int index){
     }
 }
 
+void PaintingArea::deleteActiveLayer(){
+        this->layerStructure.erase(layerStructure.begin()+activeLayer);
+        activeLayer--;
+}
+
 void PaintingArea::setLayerToActive(int index) {
     if(index<layerStructure.size()){
         this->activeLayer=index;

src/Painting/Layer/PaintingArea.h

@@ -44,6 +44,7 @@ public slots:
     // Events to handle
     void clearImage(int r, int g, int b);
     void activate(int a);
+    void deleteActiveLayer();
 
     void setAlpha(int a);
     void getMoveUp(int a);