Method onDragStart

src/app/PortWidget.cpp:417–500

void PortWidget::onDragStart(const DragStartEvent& e) {
	if (e.button != GLFW_MOUSE_BUTTON_LEFT)
		return;

	DEFER({
		// Reset overrides
		internal->overrideCws.clear();
		internal->overrideCloneCw = NULL;
		internal->overrideCreateCable = false;
	});

	// Create ComplexAction
	if (internal->history) {
		delete internal->history;
		internal->history = NULL;
	}
	internal->history = new history::ComplexAction;
	internal->history->name = string::translate("PortWidget.history.moveCable");

	std::vector<CableWidget*> cws;
	int mods = APP->window->getMods();
	if (internal->overrideCreateCable || (mods & RACK_MOD_MASK) == RACK_MOD_CTRL) {
		// Create cable with Ctrl+drag or PortCreateCableItem
		// Keep cable NULL. Will be created below
	}
	else if (internal->overrideCloneCw || (mods & RACK_MOD_MASK) == (RACK_MOD_CTRL | GLFW_MOD_SHIFT)) {
		// Clone top cable with Ctrl+shift+drag or PortCloneCableItem
		CableWidget* cloneCw = internal->overrideCloneCw;
		if (!cloneCw)
			cloneCw = APP->scene->rack->getTopCable(this);

		if (cloneCw) {
			CableWidget* cw = new CableWidget;
			cw->color = cloneCw->color;
			if (type == engine::Port::OUTPUT)
				cw->inputPort = cloneCw->inputPort;
			else
				cw->outputPort = cloneCw->outputPort;
			internal->draggedType = type;
			APP->scene->rack->addCable(cw);
			cws.push_back(cw);
		}
	}
	else {
		// Grab cable on top of stack
		cws = internal->overrideCws;
		if (cws.empty()) {
			CableWidget* cw = APP->scene->rack->getTopCable(this);
			if (cw)
				cws.push_back(cw);
		}

		for (CableWidget* cw : cws) {
			// history::CableRemove
			history::CableRemove* h = new history::CableRemove;
			h->setCable(cw);
			internal->history->push(h);