Shows menu when dragging connection on empty space in visual shader graph

doc/classes/GraphEdit.xml

@@ -211,6 +211,17 @@
 				Signal sent to the GraphEdit when the connection between 'from_slot' slot of 'from' GraphNode and 'to_slot' slot of 'to' GraphNode is attempted to be created.
 			</description>
 		</signal>
+		<signal name="connection_from_empty">
+			<argument index="0" name="to" type="String">
+			</argument>
+			<argument index="1" name="to_slot" type="int">
+			</argument>
+			<argument index="2" name="release_position" type="Vector2">
+			</argument>
+			<description>
+				Signal sent when user dragging connection from input port into empty space of the graph.
+			</description>
+		</signal>
 		<signal name="connection_to_empty">
 			<argument index="0" name="from" type="String">
 			</argument>
@@ -219,6 +230,7 @@
 			<argument index="2" name="release_position" type="Vector2">
 			</argument>
 			<description>
+				Signal sent when user dragging connection from output port into empty space of the graph.
 			</description>
 		</signal>
 		<signal name="delete_nodes_request">

editor/plugins/visual_shader_editor_plugin.cpp

@@ -1241,6 +1241,30 @@ void VisualShaderEditor::_add_node(int p_idx, int p_op_idx) {
 		undo_redo->add_do_method(expr, "set_size", Size2(250 * EDSCALE, 150 * EDSCALE));
 	}
 
+	if (to_node != -1 && to_slot != -1) {
+		if (vsnode->get_output_port_count() > 0) {
+
+			int _from_node = id_to_use;
+			int _from_slot = 0;
+
+			if (visual_shader->is_port_types_compatible(vsnode->get_output_port_type(_from_slot), visual_shader->get_node(type, to_node)->get_input_port_type(to_slot))) {
+				undo_redo->add_do_method(visual_shader.ptr(), "connect_nodes", type, _from_node, _from_slot, to_node, to_slot);
+				undo_redo->add_undo_method(visual_shader.ptr(), "disconnect_nodes", type, _from_node, _from_slot, to_node, to_slot);
+			}
+		}
+	} else if (from_node != -1 && from_slot != -1) {
+		if (vsnode->get_input_port_count() > 0) {
+
+			int _to_node = id_to_use;
+			int _to_slot = 0;
+
+			if (visual_shader->is_port_types_compatible(visual_shader->get_node(type, from_node)->get_output_port_type(from_slot), vsnode->get_input_port_type(_to_slot))) {
+				undo_redo->add_do_method(visual_shader.ptr(), "connect_nodes", type, from_node, from_slot, _to_node, _to_slot);
+				undo_redo->add_undo_method(visual_shader.ptr(), "disconnect_nodes", type, from_node, from_slot, _to_node, _to_slot);
+			}
+		}
+	}
+
 	undo_redo->add_do_method(this, "_update_graph");
 	undo_redo->add_undo_method(this, "_update_graph");
 	undo_redo->commit_action();
@@ -1310,6 +1334,15 @@ void VisualShaderEditor::_disconnection_request(const String &p_from, int p_from
 }
 
 void VisualShaderEditor::_connection_to_empty(const String &p_from, int p_from_slot, const Vector2 &p_release_position) {
+	from_node = p_from.to_int();
+	from_slot = p_from_slot;
+	_show_members_dialog(true);
+}
+
+void VisualShaderEditor::_connection_from_empty(const String &p_to, int p_to_slot, const Vector2 &p_release_position) {
+	to_node = p_to.to_int();
+	to_slot = p_to_slot;
+	_show_members_dialog(true);
 }
 
 void VisualShaderEditor::_delete_request(int which) {
@@ -1375,8 +1408,6 @@ void VisualShaderEditor::_graph_gui_input(const Ref<InputEvent> p_event) {
 
 void VisualShaderEditor::_show_members_dialog(bool at_mouse_pos) {
 
-	members_dialog->popup();
-
 	if (at_mouse_pos) {
 		saved_node_pos_dirty = true;
 		saved_node_pos = graph->get_local_mouse_position();
@@ -1385,6 +1416,7 @@ void VisualShaderEditor::_show_members_dialog(bool at_mouse_pos) {
 		members_dialog->popup();
 		members_dialog->set_position(gpos);
 	} else {
+		members_dialog->popup();
 		saved_node_pos_dirty = false;
 		members_dialog->set_position(graph->get_global_position() + Point2(5 * EDSCALE, 65 * EDSCALE));
 	}
@@ -1701,6 +1733,13 @@ void VisualShaderEditor::_member_create() {
 	}
 }
 
+void VisualShaderEditor::_member_cancel() {
+	to_node = -1;
+	to_slot = -1;
+	from_node = -1;
+	from_slot = -1;
+}
+
 void VisualShaderEditor::_tools_menu_option(int p_idx) {
 
 	TreeItem *category = members->get_root()->get_children();
@@ -1812,6 +1851,7 @@ void VisualShaderEditor::_bind_methods() {
 	ClassDB::bind_method("_edit_port_default_input", &VisualShaderEditor::_edit_port_default_input);
 	ClassDB::bind_method("_port_edited", &VisualShaderEditor::_port_edited);
 	ClassDB::bind_method("_connection_to_empty", &VisualShaderEditor::_connection_to_empty);
+	ClassDB::bind_method("_connection_from_empty", &VisualShaderEditor::_connection_from_empty);
 	ClassDB::bind_method("_line_edit_focus_out", &VisualShaderEditor::_line_edit_focus_out);
 	ClassDB::bind_method("_line_edit_changed", &VisualShaderEditor::_line_edit_changed);
 	ClassDB::bind_method("_port_name_focus_out", &VisualShaderEditor::_port_name_focus_out);
@@ -1843,6 +1883,7 @@ void VisualShaderEditor::_bind_methods() {
 	ClassDB::bind_method("_member_selected", &VisualShaderEditor::_member_selected);
 	ClassDB::bind_method("_member_unselected", &VisualShaderEditor::_member_unselected);
 	ClassDB::bind_method("_member_create", &VisualShaderEditor::_member_create);
+	ClassDB::bind_method("_member_cancel", &VisualShaderEditor::_member_cancel);
 }
 
 VisualShaderEditor *VisualShaderEditor::singleton = NULL;
@@ -1855,6 +1896,11 @@ VisualShaderEditor::VisualShaderEditor() {
 	saved_node_pos = Point2(0, 0);
 	ShaderLanguage::get_keyword_list(&keyword_list);
 
+	to_node = -1;
+	to_slot = -1;
+	from_node = -1;
+	from_slot = -1;
+
 	graph = memnew(GraphEdit);
 	add_child(graph);
 	graph->set_drag_forwarding(this);
@@ -1871,6 +1917,8 @@ VisualShaderEditor::VisualShaderEditor() {
 	graph->connect("duplicate_nodes_request", this, "_duplicate_nodes");
 	graph->connect("delete_nodes_request", this, "_on_nodes_delete");
 	graph->connect("gui_input", this, "_graph_gui_input");
+	graph->connect("connection_to_empty", this, "_connection_to_empty");
+	graph->connect("connection_from_empty", this, "_connection_from_empty");
 	graph->add_valid_connection_type(VisualShaderNode::PORT_TYPE_SCALAR, VisualShaderNode::PORT_TYPE_SCALAR);
 	graph->add_valid_connection_type(VisualShaderNode::PORT_TYPE_SCALAR, VisualShaderNode::PORT_TYPE_VECTOR);
 	graph->add_valid_connection_type(VisualShaderNode::PORT_TYPE_SCALAR, VisualShaderNode::PORT_TYPE_BOOLEAN);
@@ -1956,6 +2004,7 @@ VisualShaderEditor::VisualShaderEditor() {
 	members_dialog->get_ok()->set_disabled(true);
 	members_dialog->set_resizable(true);
 	members_dialog->set_as_minsize();
+	members_dialog->connect("hide", this, "_member_cancel");
 	add_child(members_dialog);
 
 	alert = memnew(AcceptDialog);

editor/plugins/visual_shader_editor_plugin.h

@@ -160,7 +160,13 @@ class VisualShaderEditor : public VBoxContainer {
 	void _edit_port_default_input(Object *p_button, int p_node, int p_port);
 	void _port_edited();
 
+	int to_node;
+	int to_slot;
+	int from_node;
+	int from_slot;
+
 	void _connection_to_empty(const String &p_from, int p_from_slot, const Vector2 &p_release_position);
+	void _connection_from_empty(const String &p_to, int p_to_slot, const Vector2 &p_release_position);
 
 	void _line_edit_changed(const String &p_text, Object *line_edit, int p_node_id);
 	void _line_edit_focus_out(Object *line_edit, int p_node_id);
@@ -199,6 +205,7 @@ class VisualShaderEditor : public VBoxContainer {
 	void _member_selected();
 	void _member_unselected();
 	void _member_create();
+	void _member_cancel();
 
 	Variant get_drag_data_fw(const Point2 &p_point, Control *p_from);
 	bool can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;

scene/gui/graph_edit.cpp

@@ -479,7 +479,7 @@ void GraphEdit::_top_layer_input(const Ref<InputEvent> &p_ev) {
 					connecting_color = gn->get_connection_input_color(j);
 					connecting_target = false;
 					connecting_to = pos;
-					just_disconnected = true;
+					just_disconnected = false;
 
 					return;
 				}
@@ -550,11 +550,18 @@ void GraphEdit::_top_layer_input(const Ref<InputEvent> &p_ev) {
 			emit_signal("connection_request", from, from_slot, to, to_slot);
 
 		} else if (!just_disconnected) {
+
 			String from = connecting_from;
 			int from_slot = connecting_index;
 			Vector2 ofs = Vector2(mb->get_position().x, mb->get_position().y);
-			emit_signal("connection_to_empty", from, from_slot, ofs);
+
+			if (!connecting_out) {
+				emit_signal("connection_from_empty", from, from_slot, ofs);
+			} else {
+				emit_signal("connection_to_empty", from, from_slot, ofs);
+			}
 		}
+
 		connecting = false;
 		top_layer->update();
 		update();
@@ -1292,6 +1299,7 @@ void GraphEdit::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("duplicate_nodes_request"));
 	ADD_SIGNAL(MethodInfo("node_selected", PropertyInfo(Variant::OBJECT, "node", PROPERTY_HINT_RESOURCE_TYPE, "Node")));
 	ADD_SIGNAL(MethodInfo("connection_to_empty", PropertyInfo(Variant::STRING, "from"), PropertyInfo(Variant::INT, "from_slot"), PropertyInfo(Variant::VECTOR2, "release_position")));
+	ADD_SIGNAL(MethodInfo("connection_from_empty", PropertyInfo(Variant::STRING, "to"), PropertyInfo(Variant::INT, "to_slot"), PropertyInfo(Variant::VECTOR2, "release_position")));
 	ADD_SIGNAL(MethodInfo("delete_nodes_request"));
 	ADD_SIGNAL(MethodInfo("_begin_node_move"));
 	ADD_SIGNAL(MethodInfo("_end_node_move"));

scene/resources/visual_shader.cpp

@@ -257,7 +257,7 @@ bool VisualShader::can_connect_nodes(Type p_type, int p_from_node, int p_from_po
 	VisualShaderNode::PortType from_port_type = g->nodes[p_from_node].node->get_output_port_type(p_from_port);
 	VisualShaderNode::PortType to_port_type = g->nodes[p_to_node].node->get_input_port_type(p_to_port);
 
-	if (MAX(0, from_port_type - 2) != (MAX(0, to_port_type - 2))) {
+	if (!is_port_types_compatible(from_port_type, to_port_type)) {
 		return false;
 	}
 
@@ -271,6 +271,10 @@ bool VisualShader::can_connect_nodes(Type p_type, int p_from_node, int p_from_po
 	return true;
 }
 
+bool VisualShader::is_port_types_compatible(int p_a, int p_b) const {
+	return MAX(0, p_a - 2) == (MAX(0, p_b - 2));
+}
+
 void VisualShader::connect_nodes_forced(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port) {
 	ERR_FAIL_INDEX(p_type, TYPE_MAX);
 	Graph *g = &graph[p_type];
@@ -295,8 +299,8 @@ Error VisualShader::connect_nodes(Type p_type, int p_from_node, int p_from_port,
 	VisualShaderNode::PortType from_port_type = g->nodes[p_from_node].node->get_output_port_type(p_from_port);
 	VisualShaderNode::PortType to_port_type = g->nodes[p_to_node].node->get_input_port_type(p_to_port);
 
-	if (MAX(0, from_port_type - 2) != (MAX(0, to_port_type - 2))) {
+	if (!is_port_types_compatible(from_port_type, to_port_type)) {
-		ERR_EXPLAIN("Incompatible port types (scalar/vec/bool with transform");
+		ERR_EXPLAIN("Incompatible port types (scalar/vec/bool) with transform");
 		ERR_FAIL_V(ERR_INVALID_PARAMETER);
 		return ERR_INVALID_PARAMETER;
 	}

scene/resources/visual_shader.h

@@ -138,6 +138,7 @@ public:
 	Error connect_nodes(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port);
 	void disconnect_nodes(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port);
 	void connect_nodes_forced(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port);
+	bool is_port_types_compatible(int p_a, int p_b) const;
 
 	void rebuild();
 	void get_node_connections(Type p_type, List<Connection> *r_connections) const;