Editor graph delegate: Add HorizontalFix, VerticalFix and StructureFix constraints

src/editor/C4ConsoleQtPropListViewer.cpp

@@ -2157,6 +2157,12 @@ bool C4PropertyDelegatePoint::IsPasteValid(const C4Value &val) const
 C4PropertyDelegateGraph::C4PropertyDelegateGraph(const class C4PropertyDelegateFactory *factory, C4PropList *props)
 	: C4PropertyDelegateShape(factory, props)
 {
+	if (props)
+	{
+		horizontal_fix = props->GetPropertyBool(P_HorizontalFix);
+		vertical_fix = props->GetPropertyBool(P_VerticalFix);
+		structure_fix = props->GetPropertyBool(P_StructureFix);
+	}
 }
 
 void C4PropertyDelegateGraph::DoPaint(QPainter *painter, const QRect &inner_rect) const
@@ -2215,6 +2221,10 @@ bool C4PropertyDelegateGraph::IsEdgePasteValid(const C4Value &val) const
 
 bool C4PropertyDelegateGraph::IsPasteValid(const C4Value &val) const
 {
+	// Unfortunately, there is no good way to determine the correct value for fixed structure / position graph pastes
+	// So just reject pastes for now
+	// (TODO: Could store a default structure in a property and compare to that)
+	if (horizontal_fix || vertical_fix || structure_fix) return false;
 	// Check storage as prop list
 	const int32_t n_props = 2;
 	C4Value prop_vals[n_props]; // vertices & edges

src/editor/C4ConsoleQtPropListViewer.h

@@ -559,6 +559,10 @@ public:
 
 class C4PropertyDelegateGraph : public C4PropertyDelegateShape
 {
+	bool horizontal_fix = false;
+	bool vertical_fix = false;
+	bool structure_fix = false;
+
 	void DoPaint(QPainter *painter, const QRect &inner_rect) const override;
 protected:
 	bool IsVertexPasteValid(const C4Value &val) const;

src/editor/C4ConsoleQtShapes.cpp

@@ -791,6 +791,9 @@ C4ConsoleQtGraph::C4ConsoleQtGraph(C4Object *for_obj, C4PropList *props, const c
 		props->GetProperty(P_EdgeDelegate, &edge_delegate);
 		allow_vertex_selection = !!vertex_delegate.getPropList();
 		allow_edge_selection = !!edge_delegate.getPropList();
+		horizontal_fix = props->GetPropertyBool(P_HorizontalFix);
+		vertical_fix = props->GetPropertyBool(P_VerticalFix);
+		structure_fix = props->GetPropertyBool(P_StructureFix);
 	}
 }
 
@@ -852,6 +855,27 @@ bool C4ConsoleQtGraph::IsHit(int32_t x, int32_t y, int32_t hit_range, Qt::Cursor
 			++i;
 		}
 	}
+	// Check if structure change is allowed
+	if (has_hit && (shift_down || ctrl_down) && structure_fix)
+	{
+		*drag_cursor = Qt::CursorShape::ForbiddenCursor;
+	}
+	else if (*drag_cursor == Qt::CursorShape::SizeAllCursor)
+	{
+		// Adjust cursor for constrained movement
+		if (horizontal_fix && vertical_fix)
+		{
+			*drag_cursor = Qt::CursorShape::PointingHandCursor;
+		}
+		else if (horizontal_fix)
+		{
+			*drag_cursor = Qt::CursorShape::SizeVerCursor;
+		}
+		else if (vertical_fix)
+		{
+			*drag_cursor = Qt::CursorShape::SizeHorCursor;
+		}
+	}
 	return has_hit;
 }
 
@@ -966,7 +990,7 @@ bool C4ConsoleQtGraph::StartDragging(int32_t *border, int32_t x, int32_t y, bool
 	drag_snapped = false;
 	drag_snap_vertex = -1;
 	drag_source_vertex_index = -1;
-	if (shift_down && !ctrl_down)
+	if (shift_down && !ctrl_down && !structure_fix)
 	{
 		// Shift: Insert vertex
 		if (IsEdgeDrag(*border))
@@ -983,7 +1007,7 @@ bool C4ConsoleQtGraph::StartDragging(int32_t *border, int32_t x, int32_t y, bool
 		// Start dragging
 		return true;
 	}
-	else if (ctrl_down && !shift_down)
+	else if (ctrl_down && !shift_down && !structure_fix)
 	{
 		// Ctrl: Delete vertex or edge
 		if (IsEdgeDrag(*border))
@@ -1018,7 +1042,7 @@ bool C4ConsoleQtGraph::StartDragging(int32_t *border, int32_t x, int32_t y, bool
 	}
 	else
 	{
-		// Unknown modifiers
+		// Unknown modifiers or trying to modify a structure-fixed graph
 		return false;
 	}
 }
@@ -1033,10 +1057,10 @@ void C4ConsoleQtGraph::Drag(int32_t x, int32_t y, int32_t dx, int32_t dy, int32_
 		// Regular vertex movement
 		dx -= drag_snap_offset_x;
 		dy -= drag_snap_offset_y;
-		dragged_vertex.x += dx;
-		dragged_vertex.y += dy;
+		if (!horizontal_fix) dragged_vertex.x += dx;
+		if (!vertical_fix) dragged_vertex.y += dy;
 		// Handle snap to combine with other vertices
-		if (!IsPolyline())
+		if (!IsPolyline() && !structure_fix)
 		{
 			int32_t i = 0;
 			drag_snap_vertex = -1;

src/editor/C4ConsoleQtShapes.h

@@ -188,6 +188,9 @@ protected:
 
 	bool allow_vertex_selection = false; // If vertices on the graph can be selected
 	bool allow_edge_selection = false; // If edges on the graph can be selected
+	bool horizontal_fix = false; // If edges are locked horizontally
+	bool vertical_fix = false; // If edges are locked vertically
+	bool structure_fix = false; // If edge+vertex insertion/deletion is blocked
 
 	C4Value vertex_delegate, edge_delegate;
 

src/script/C4StringTable.cpp

@@ -267,6 +267,9 @@ C4StringTable::C4StringTable()
 	P[P_Delegate] = "Delegate";
 	P[P_VertexDelegate] = "VertexDelegate";
 	P[P_EdgeDelegate] = "EdgeDelegate";
+	P[P_HorizontalFix] = "HorizontalFix";
+	P[P_VerticalFix] = "VerticalFix";
+	P[P_StructureFix] = "StructureFix";
 	P[P_Min] = "Min";
 	P[P_Max] = "Max";
 	P[P_Set] = "Set";

src/script/C4StringTable.h

@@ -491,6 +491,9 @@ enum C4PropertyName
 	P_Delegate,
 	P_VertexDelegate,
 	P_EdgeDelegate,
+	P_HorizontalFix,
+	P_VerticalFix,
+	P_StructureFix,
 	P_Min,
 	P_Max,
 	P_Set,