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How to scroll two TWebBrowser simultaneously?

Posted on 2008-10-21
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Last Modified: 2013-11-23
I'm having a hard time looking for a solution on scrolling two TWebBrowser simultaneously. I got on how to trigger a scroll event but i can't figure out on how to get the scroll bar position after scrolling it so that Ii can set to the other TWebBrowser. Anybody here could give me a solution on this? Thanks.
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Question by:edeaux
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2 Comments
 
LVL 5

Expert Comment

by:wd123
ID: 22768299
how you get scroll-event  ?
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Accepted Solution

by:
edeaux earned 0 total points
ID: 22775578
type
  THTMLScrollEvent = procedure of object;
  THTMLWindowScroller = class(TInterfacedObject, IDispatch)
  private
    FHTMLWindow: IHTMLWindow2;
    FConnected: Boolean;
    FOnScroll: THTMLScrollEvent;
    procedure SetConnected(const Value: Boolean);
    procedure SetOnScroll(const Value: THTMLScrollEvent);
  protected
    //IDispatch
    function GetTypeInfoCount(out Count: Integer): HResult; stdcall;
    function GetTypeInfo(Index, LocaleID: Integer; out TypeInfo): HResult; stdcall;
    function GetIDsOfNames(const IID: TGUID; Names: Pointer;
      NameCount, LocaleID: Integer; DispIDs: Pointer): HResult; stdcall;
    function Invoke(DispID: Integer; const IID: TGUID; LocaleID: Integer;
      Flags: Word; var Params; VarResult, ExcepInfo, ArgErr: Pointer): HResult; stdcall;
  public
    destructor Destroy; override;
    procedure ConnectToWindow(HTMLWindow: IHTMLWindow2);
    procedure DisconnectFromWindow;
    property Connected: Boolean read FConnected write SetConnected;
    property OnScroll: THTMLScrollEvent read FOnScroll write SetOnScroll;
  end;

procedure THTMLWindowScroller.ConnectToWindow(
  HTMLWindow: IHTMLWindow2);
begin
  Assert(HTMLWindow <> nil, 'HTMLWindow : nil pointer!');
  FHTMLWindow := HTMLWindow;
  FHTMLWindow.onscroll := IDispatch(Self);
  Connected := System.True;
end;

destructor THTMLWindowScroller.Destroy;
begin
  inherited Destroy;
end;

procedure THTMLWindowScroller.DisconnectFromWindow;
var NullPointer: OleVariant;
begin
  if Assigned(FHTMLWindow) then
  begin
    TVarData(NullPointer).VType := varDispatch;
    TVarData(NullPointer).VDispatch := nil;
    FHTMLWindow.onscroll := NullPointer;
    FHTMLWindow := nil;
    Connected := System.False;
  end;
end;

function THTMLWindowScroller.GetIDsOfNames(const IID: TGUID;
  Names: Pointer; NameCount, LocaleID: Integer; DispIDs: Pointer): HResult;
begin
  Result := S_OK;
end;

function THTMLWindowScroller.GetTypeInfo(Index, LocaleID: Integer;
  out TypeInfo): HResult;
begin
  Result := S_OK;
end;

function THTMLWindowScroller.GetTypeInfoCount(
  out Count: Integer): HResult;
begin
  Result := S_OK;
end;

function THTMLWindowScroller.Invoke(DispID: Integer; const IID: TGUID;
  LocaleID: Integer; Flags: Word; var Params; VarResult, ExcepInfo,
  ArgErr: Pointer): HResult;
begin
  if Assigned(FOnScroll) then
    FOnScroll;
  Result := S_OK;
end;

procedure THTMLWindowScroller.SetConnected(const Value: Boolean);
begin
  FConnected := Value;
end;

procedure THTMLWindowScroller.SetOnScroll(const Value: THTMLScrollEvent);
begin
  FOnScroll := Value;
end;




*** i got it also here in expert-exchange
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