TPdfObjectList.FindObjectAt

Declaration

function FindObjectAt(Pt: TDPoint; LimitToType: TPdfObjectType = ptUnknown; VisibleOnly: Boolean = True): Integer; overload;
function FindObjectAt(Pt: TPoint; LimitToType: TPdfObjectType = ptUnknown; VisibleOnly: Boolean = True): Integer; overload;

Description

Returns the index of any object found on the page at the specified position (in terms of PDF points).
If VisibleOnly = True, only objects that are marked as Visible will be returned.
Result will be -1 if no objects are found.

PDF Page Points

Objects on a PDF page are specified in points that originate at the bottom-left, i.e. when X,Y = (0,0). The top-left of the page is specified by (PageWidth, PageHeight).
To convert PDF points to screen values, use PageToScr.

Example

// Select the clicked object
procedure TfrmMain.ImageEnView1MouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
  idx: Integer;
  pt: TDPoint;
begin
  pt := ImageEnView1.PdfViewer.ScrToPage( X, Y, True );
  idx := ImageEnView1.PdfViewer.Objects.FindObjectAt( pt );
  if idx > -1 then
  begin
    ImageEnView1.PdfViewer.SelectedObject := idx;
    ImageEnView1.Invalidate();
  end;
end;

TPdfObjectList.FindObjectAt