Michael Schimmel
148 lines
4.1 KiB
ObjectPascal
148 lines
4.1 KiB
ObjectPascal
unit Myc.Fmx.AstEditor.Handlers;
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interface
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uses
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System.SysUtils,
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System.Generics.Collections,
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System.UITypes,
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Myc.Ast.Nodes,
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Myc.Ast.Identities,
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Myc.Fmx.AstEditor.Render,
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Myc.Fmx.AstEditor.Node;
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type
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// --- Abstract List Base ---
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// Implements IReorderable to support drag & drop reordering within the virtual tree.
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// Now operates on the untyped ITupleNode.
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TNodeListHandler = class(TBaseNodeHandler<ITupleNode>, IReorderable)
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protected
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FChildNodes: TList<TAstViewNode>;
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function GetOrientation: TLayoutOrientation; virtual; abstract;
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function GetAlignment: TLayoutAlignment; virtual;
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public
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constructor Create(const ANode: ITupleNode);
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destructor Destroy; override;
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procedure BuildUI(OwnerNode: TAstViewNode); override;
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function ReconstructAst(OwnerNode: TAstViewNode): IAstNode; override; abstract;
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// IReorderable Implementation
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function CanDrag(Child: TVisualNode): Boolean;
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procedure MoveChild(SourceIndex, TargetIndex: Integer);
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end;
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implementation
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{ TNodeListHandler }
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constructor TNodeListHandler.Create(const ANode: ITupleNode);
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begin
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inherited Create(ANode);
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FChildNodes := TList<TAstViewNode>.Create;
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end;
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destructor TNodeListHandler.Destroy;
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begin
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FChildNodes.Free;
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inherited;
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end;
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function TNodeListHandler.GetAlignment: TLayoutAlignment;
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begin
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Result := TLayoutAlignment.laCenter;
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end;
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procedure TNodeListHandler.BuildUI(OwnerNode: TAstViewNode);
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var
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visu: IAstVisualizer;
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i: Integer;
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childView: TAstViewNode;
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openTok, closeTok, sep: string;
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listId: IListIdentity;
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elements: TArray<IAstNode>;
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begin
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if (FNode.Identity <> nil) and (FNode.Identity.Kind = ikList) then
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begin
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listId := FNode.Identity.AsList;
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openTok := listId.OpenToken;
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closeTok := listId.CloseToken;
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sep := listId.Separator;
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end
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else
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begin
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openTok := '';
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closeTok := '';
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sep := ' ';
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end;
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visu := OwnerNode.Visualizer.Clone(OwnerNode, OwnerNode.Visualizer.ExprDepth);
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// No BeginUpdate/EndUpdate needed for TVisualNode, just property setting
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OwnerNode.Frameless := True;
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OwnerNode.Orientation := GetOrientation;
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OwnerNode.Alignment := GetAlignment;
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if openTok <> '' then
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OwnerNode.AddLabel(OwnerNode, openTok);
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// Optimization: Access Elements array directly from ITupleNode
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elements := FNode.Elements;
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for i := 0 to High(elements) do
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begin
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childView := visu.CallAccept(elements[i]);
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FChildNodes.Add(childView);
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if (i < High(elements)) and (sep <> '') and (sep <> ' ') then
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OwnerNode.AddLabel(OwnerNode, sep);
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end;
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if closeTok <> '' then
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OwnerNode.AddLabel(OwnerNode, closeTok);
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if Length(elements) = 0 then
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begin
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if (openTok = '') and (closeTok = '') then
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begin
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var lbl := OwnerNode.AddLabel(OwnerNode, 'ø');
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lbl.Opacity := 0.5;
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end;
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end;
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end;
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// IReorderable Implementation
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function TNodeListHandler.CanDrag(Child: TVisualNode): Boolean;
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begin
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// Only allow dragging if the child is one of our managed ViewNodes
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if Child is TAstViewNode then
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Result := FChildNodes.Contains(TAstViewNode(Child))
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else
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Result := False;
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end;
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procedure TNodeListHandler.MoveChild(SourceIndex, TargetIndex: Integer);
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var
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item: TAstViewNode;
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begin
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if (SourceIndex < 0) or (SourceIndex >= FChildNodes.Count) then
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Exit;
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if (TargetIndex < 0) or (TargetIndex > FChildNodes.Count) then
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Exit;
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// Adjust target index if moving downwards (since removing source shifts indices)
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if SourceIndex < TargetIndex then
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Dec(TargetIndex);
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if SourceIndex = TargetIndex then
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Exit;
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item := FChildNodes[SourceIndex];
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FChildNodes.Delete(SourceIndex);
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FChildNodes.Insert(TargetIndex, item);
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// The visual order update happens via the controller's compilation cycle
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end;
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end.
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