visual tools: Add EndDrag and EndHold hooks

src/visual_tool.cpp

@@ -208,6 +208,9 @@ void VisualTool<FeatureType>::OnMouseEvent(wxMouseEvent &event) {
 					else
 						SetSelection(active_feature, true);
 				}
+			} else {
+				for (auto sel : sel_features)
+					EndDrag(sel);
 			}
 
 			active_feature = nullptr;
@@ -218,6 +221,7 @@ void VisualTool<FeatureType>::OnMouseEvent(wxMouseEvent &event) {
 	else if (holding) {
 		if (!event.LeftIsDown()) {
 			holding = false;
+			EndHold();
 
 			parent->ReleaseMouse();
 			parent->SetFocus();

src/visual_tool.h

@@ -166,6 +166,8 @@ private:
 	virtual bool InitializeHold() { return false; }
 	/// @brief Called on every mouse event during a hold
 	virtual void UpdateHold() { }
+	/// @brief Called when the hold ended
+	virtual void EndHold() { }
 
 	/// @brief Called at the beginning of a drag
 	/// @param feature The visual feature clicked on
@@ -174,6 +176,9 @@ private:
 	/// @brief Called on every mouse event during a drag
 	/// @param feature The current feature to process; not necessarily the one clicked on
 	virtual void UpdateDrag(FeatureType *feature) { }
+	/// @brief Called at the end of a drag
+	/// @param feature The current feature to process; not necessarily the one clicked on
+	virtual void EndDrag(FeatureType *feature) { }
 
 protected:
 	std::set<FeatureType *> sel_features; ///< Currently selected visual features