Add Widget::onPathDrop() event, added dragging patches to window to load

them

include/app.hpp

@@ -366,6 +366,7 @@ struct RackScene : Scene {
 	void step() override;
 	void draw(NVGcontext *vg) override;
 	Widget *onHoverKey(Vec pos, int key) override;
+	bool onPathDrop(Vec pos, const std::list<std::string>& paths) override;
 };
 
 ////////////////////

include/widgets.hpp

@@ -147,6 +147,7 @@ struct Widget {
 	virtual void onDragEnter(Widget *origin) {}
 	virtual void onDragLeave(Widget *origin) {}
 	virtual void onDragDrop(Widget *origin) {}
+	virtual bool onPathDrop(Vec pos, const std::list<std::string>& paths);
 
 	virtual void onAction() {}
 	virtual void onChange() {}

src/app/RackScene.cpp

@@ -118,5 +118,17 @@ Widget *RackScene::onHoverKey(Vec pos, int key) {
 }
 
 
+bool RackScene::onPathDrop(Vec pos, const std::list<std::string>& paths) {
+	if (paths.size() >= 1) {
+		const std::string& firstPath = paths.front();
+		if (extractExtension(firstPath) == "vcv") {
+			gRackWidget->loadPatch(firstPath);
+			return true;
+		}
+	}
+	return false;
+}
+
+
 
 } // namespace rack

src/gui.cpp

@@ -203,7 +203,7 @@ void charCallback(GLFWwindow *window, unsigned int codepoint) {
 	}
 }
 
-void keyCallback(GLFWwindow* window, int key, int scancode, int action, int mods) {
+void keyCallback(GLFWwindow *window, int key, int scancode, int action, int mods) {
 	if (action == GLFW_PRESS || action == GLFW_REPEAT) {
 		// onFocusKey
 		if (gFocusedWidget && gFocusedWidget->onFocusKey(key))
@@ -213,6 +213,14 @@ void keyCallback(GLFWwindow* window, int key, int scancode, int action, int mods
 	}
 }
 
+void dropCallback(GLFWwindow *window, int count, const char **paths) {
+	std::list<std::string> pathsList;
+	for (int i = 0; i < count; i++) {
+		pathsList.push_back(paths[i]);
+	}
+	gScene->onPathDrop(gMousePos, pathsList);
+}
+
 void errorCallback(int error, const char *description) {
 	fprintf(stderr, "GLFW error %d: %s\n", error, description);
 }
@@ -272,6 +280,7 @@ void guiInit() {
 	glfwSetScrollCallback(gWindow, scrollCallback);
 	glfwSetCharCallback(gWindow, charCallback);
 	glfwSetKeyCallback(gWindow, keyCallback);
+	glfwSetDropCallback(gWindow, dropCallback);
 
 	// Set up GLEW
 	glewExperimental = GL_TRUE;

src/widgets/Widget.cpp

@@ -184,6 +184,19 @@ Widget *Widget::onScroll(Vec pos, Vec scrollRel) {
 	return NULL;
 }
 
+bool Widget::onPathDrop(Vec pos, const std::list<std::string>& paths) {
+	for (auto it = children.rbegin(); it != children.rend(); it++) {
+		Widget *child = *it;
+		if (!child->visible)
+			continue;
+		if (child->box.contains(pos)) {
+			if (child->onPathDrop(pos.minus(child->box.pos), paths));
+				return true;
+		}
+	}
+	return false;
+}
+
 void Widget::onZoom() {
 	for (auto it = children.rbegin(); it != children.rend(); it++) {
 		Widget *child = *it;