Changed None to empty string, corrected dynamic pointers

src/Clip.cpp

@@ -749,7 +749,7 @@ std::string Clip::PropertiesJSON(int64_t requested_frame) const {
 	if (!parentObjectId.empty()) {
 		root["parentObjectId"] = add_property_json("Parent", 0.0, "string", parentObjectId, NULL, -1, -1, false, requested_frame);
 	} else {
-		root["parentObjectId"] = add_property_json("Parent", 0.0, "string", "None", NULL, -1, -1, false, requested_frame);
+		root["parentObjectId"] = add_property_json("Parent", 0.0, "string", "", NULL, -1, -1, false, requested_frame);
 	}
 	// Add gravity choices (dropdown style)
 	root["gravity"]["choices"].append(add_property_choice_json("Top Left", GRAVITY_TOP_LEFT, gravity));
@@ -766,16 +766,16 @@ std::string Clip::PropertiesJSON(int64_t requested_frame) const {
 	root["scale"]["choices"].append(add_property_choice_json("Crop", SCALE_CROP, scale));
 	root["scale"]["choices"].append(add_property_choice_json("Best Fit", SCALE_FIT, scale));
 	root["scale"]["choices"].append(add_property_choice_json("Stretch", SCALE_STRETCH, scale));
-	root["scale"]["choices"].append(add_property_choice_json("None", SCALE_NONE, scale));
+	root["scale"]["choices"].append(add_property_choice_json("", SCALE_NONE, scale));
 
 	// Add frame number display choices (dropdown style)
-	root["display"]["choices"].append(add_property_choice_json("None", FRAME_DISPLAY_NONE, display));
+	root["display"]["choices"].append(add_property_choice_json("", FRAME_DISPLAY_NONE, display));
 	root["display"]["choices"].append(add_property_choice_json("Clip", FRAME_DISPLAY_CLIP, display));
 	root["display"]["choices"].append(add_property_choice_json("Timeline", FRAME_DISPLAY_TIMELINE, display));
 	root["display"]["choices"].append(add_property_choice_json("Both", FRAME_DISPLAY_BOTH, display));
 
 	// Add volume mixing choices (dropdown style)
-	root["mixing"]["choices"].append(add_property_choice_json("None", VOLUME_MIX_NONE, mixing));
+	root["mixing"]["choices"].append(add_property_choice_json("", VOLUME_MIX_NONE, mixing));
 	root["mixing"]["choices"].append(add_property_choice_json("Average", VOLUME_MIX_AVERAGE, mixing));
 	root["mixing"]["choices"].append(add_property_choice_json("Reduce", VOLUME_MIX_REDUCE, mixing));
 
@@ -962,7 +962,7 @@ void Clip::SetJsonValue(const Json::Value root) {
 	// Set data from Json (if key is found)
 	if (!root["parentObjectId"].isNull()){
 		parentObjectId = root["parentObjectId"].asString();
-		if (parentObjectId.size() > 0 && parentObjectId != "None"){
+		if (parentObjectId.size() > 0 && parentObjectId != ""){
 			AttachToObject(parentObjectId);
 		} else{
 			parentTrackedObject = nullptr;

src/EffectBase.cpp

@@ -52,7 +52,7 @@ void EffectBase::InitEffectInfo()
 	info.has_tracked_object = false;
 	info.name = "";
 	info.description = "";
-	info.parent_effect_id = "None";
+	info.parent_effect_id = "";
 }
 
 // Display file information
@@ -160,7 +160,7 @@ void EffectBase::SetJsonValue(Json::Value root) {
 
 	if (!root["parent_effect_id"].isNull()){
 		info.parent_effect_id = root["parent_effect_id"].asString();
-		if (info.parent_effect_id.size() > 0 && info.parent_effect_id != "None" && parentEffect == NULL)
+		if (info.parent_effect_id.size() > 0 && info.parent_effect_id != "" && parentEffect == NULL)
 			SetParentEffect(info.parent_effect_id);
 		else 
 			parentEffect = NULL;

src/KeyFrame.cpp

@@ -34,9 +34,9 @@
 #include <algorithm>
 #include <functional>
 #include <utility>
-#include <cassert>         // For assert()
-#include <iostream>        // For std::cout
-#include <iomanip>         // For std::setprecision
+#include <cassert>		 // For assert()
+#include <iostream>		 // For std::cout
+#include <iomanip>		 // For std::setprecision
 
 using namespace std;
 using namespace openshot;
@@ -92,7 +92,6 @@ namespace openshot{
 			t_step /= 2;
 		} while (true);
 	}
-
 	// Interpolate two points using the right Point's interpolation method
 	double InterpolateBetween(Point const & left, Point const & right, double target, double allowed_error) {
 		assert(left.co.X < target);

src/TrackedObjectBBox.cpp

@@ -370,7 +370,7 @@ void TrackedObjectBBox::SetJsonValue(const Json::Value root)
 {   
 
 	// Set the Id by the given JSON object
-	if (!root["box_id"].isNull() && root["box_id"].asString() != "None")
+	if (!root["box_id"].isNull() && root["box_id"].asString() != "")
 		Id(root["box_id"].asString());
 
 	// Set the BaseFps by the given JSON object
@@ -395,7 +395,7 @@ void TrackedObjectBBox::SetJsonValue(const Json::Value root)
 
 	// Set the id of the child clip
 	// Does not allow to link to the parent clip
-	if (!root["child_clip_id"].isNull() && root["box_id"].asString() != "None"){
+	if (!root["child_clip_id"].isNull() && root["box_id"].asString() != ""){
 		Clip* parentClip = (Clip *) ParentClip();
 
 		if(parentClip && (root["child_clip_id"].asString() != parentClip->Id())){

src/TrackedObjectBase.cpp

@@ -39,16 +39,16 @@ namespace openshot
 	// Blank constructor
 	TrackedObjectBase::TrackedObjectBase() : visible(1.0), draw_box(1)
 	{
-		// Initializes the id as "None"
-		id = "None";
-		childClipId = "None";
+		// Initializes the id as ""
+		id = "";
+		childClipId = "";
 	}
 
 	// Default constructor
 	TrackedObjectBase::TrackedObjectBase(std::string _id) : visible(1.0)
 	{
 		Id(_id);
-		childClipId = "None";
+		childClipId = "";
 	}
 
 	Json::Value TrackedObjectBase::add_property_choice_json(std::string name, int value, int selected_value) const

src/effects/Tracker.cpp

@@ -132,7 +132,7 @@ std::shared_ptr<Frame> Tracker::GetFrame(std::shared_ptr<Frame> frame, int64_t f
 		}
 
 		// Get the image of the Tracked Object' child clip
-		if (trackedData->ChildClipId() != "None"){
+		if (trackedData->ChildClipId() != ""){
 			// Cast the parent timeline of this effect 
 			Timeline* parentTimeline = (Timeline *) ParentTimeline();
 			if (parentTimeline){

tests/KeyFrame.cpp

@@ -693,8 +693,9 @@ TEST_CASE( "AttachToObject", "[libopenshot][keyframe]" )
 	auto trackedDataJson = trackedData->JsonValue();
 
 	// Get and cast the trakcedObject
-	auto trackedObject_base = t.GetTrackedObject("None");
-	std::shared_ptr<TrackedObjectBBox> trackedObject = std::static_pointer_cast<TrackedObjectBBox>(trackedObject_base);
+	auto trackedObject_base = t.GetTrackedObject("");
+	auto trackedObject = std::make_shared<TrackedObjectBBox>();
+	trackedObject = std::dynamic_pointer_cast<TrackedObjectBBox>(trackedObject_base);
 	CHECK(trackedObject == trackedData);
 
 	// Set trackedObject Json Value
@@ -705,7 +706,8 @@ TEST_CASE( "AttachToObject", "[libopenshot][keyframe]" )
 	childClip.Open();
 	childClip.AttachToObject(tracked_id);
 
-	std::shared_ptr<TrackedObjectBBox> trackedTest = std::static_pointer_cast<TrackedObjectBBox>(childClip.GetAttachedObject());
+	auto trackedTest = std::make_shared<TrackedObjectBBox>();
+	trackedTest = std::dynamic_pointer_cast<TrackedObjectBBox>(childClip.GetAttachedObject());
 
 	CHECK(trackedData->scale_x.GetValue(1) == trackedTest->scale_x.GetValue(1));
 
@@ -719,7 +721,7 @@ TEST_CASE( "GetBoxValues", "[libopenshot][keyframe]" )
 	TrackedObjectBBox trackedDataObject;
 	trackedDataObject.AddBox(1, 10.0, 10.0, 20.0, 20.0, 30.0);
 
-	std::shared_ptr<TrackedObjectBase> trackedData = std::make_shared<TrackedObjectBBox>(trackedDataObject);
+	auto trackedData = std::make_shared<TrackedObjectBBox>(trackedDataObject);
 
 	auto boxValues = trackedData->GetBoxValues(1);
 

tests/KeyFrame_Tests.cpp

@@ -670,7 +670,7 @@ TEST(Attach_test){
 	auto trackedDataJson = trackedData->JsonValue();
 
 	// Get and cast the trakcedObject
-	auto trackedObject_base = t.GetTrackedObject("None");
+	auto trackedObject_base = t.GetTrackedObject("");
 	std::shared_ptr<TrackedObjectBBox> trackedObject = std::static_pointer_cast<TrackedObjectBBox>(trackedObject_base);
 	CHECK_EQUAL(trackedData, trackedObject);