CEF4Delphi/source/uCEFStringVisitor.pas

unit uCEFStringVisitor;

{$IFDEF FPC}
  {$MODE OBJFPC}{$H+}
{$ENDIF}

{$I cef.inc}

{$IFNDEF TARGET_64BITS}{$ALIGN ON}{$ENDIF}
{$MINENUMSIZE 4}

interface

uses
  uCEFBaseRefCounted, uCEFInterfaces, uCEFTypes;

type
  TCefStringVisitorOwn = class(TCefBaseRefCountedOwn, ICefStringVisitor)
    protected
      procedure Visit(const str: ustring); virtual;

    public
      constructor Create; virtual;
  end;

  TCefFastStringVisitor = class(TCefStringVisitorOwn)
    protected
      FVisit: TCefStringVisitorProc;

      procedure Visit(const str: ustring); override;

    public
      constructor Create(const callback: TCefStringVisitorProc); reintroduce;
  end;

  TCustomCefStringVisitor = class(TCefStringVisitorOwn)
    protected
      FEvents : Pointer;

      procedure Visit(const str: ustring); override;

    public
      constructor Create(const aEvents : IChromiumEvents); reintroduce;
      destructor  Destroy; override;
  end;

implementation

uses
  {$IFDEF DELPHI16_UP}
  System.SysUtils,
  {$ELSE}
  SysUtils,
  {$ENDIF}
  uCEFMiscFunctions;

procedure cef_string_visitor_visit(      self : PCefStringVisitor;
                                   const str  : PCefString); stdcall;
var
  TempObject : TObject;
begin
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefStringVisitorOwn) then
    TCefStringVisitorOwn(TempObject).Visit(CefString(str));
end;

// TCefStringVisitorOwn

constructor TCefStringVisitorOwn.Create;
begin
  inherited CreateData(SizeOf(TCefStringVisitor));

  PCefStringVisitor(FData)^.visit := {$IFDEF FPC}@{$ENDIF}cef_string_visitor_visit;
end;

procedure TCefStringVisitorOwn.Visit(const str: ustring);
begin
  //
end;

// TCefFastStringVisitor

constructor TCefFastStringVisitor.Create(const callback: TCefStringVisitorProc);
begin
  inherited Create;

  FVisit := callback;
end;

procedure TCefFastStringVisitor.Visit(const str: ustring);
begin
  FVisit(str);
end;

// TCustomCefStringVisitor

constructor TCustomCefStringVisitor.Create(const aEvents : IChromiumEvents);
begin
  inherited Create;

  FEvents := Pointer(aEvents);
end;

destructor TCustomCefStringVisitor.Destroy;
begin
  FEvents := nil;

  inherited Destroy;
end;

procedure TCustomCefStringVisitor.Visit(const str: ustring);
begin
  try
    try
      if (FEvents <> nil) then IChromiumEvents(FEvents).doTextResultAvailable(str);
    except
      on e : exception do
        if CustomExceptionHandler('TCustomCefStringVisitor.Visit', e) then raise;
    end;
  finally
    FEvents := nil;
  end;
end;

end.