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Обработка событий в DOM Internet Explorer

15:17
 
uses
MSHTML;
type
THTMLEventNotifyEvent =
procedure(EventObject: IHTMLEventObj; EventType: string) of object;
 
THTMLEvent = class(TInterfacedObject, IDispatch)
private
FDocument: IHTMLDocument2;
FOnEvent: THTMLEventNotifyEvent;
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;
procedure DoEvent;
public
constructor Create(Document: IHTMLDocument2);
property OnEvent: THTMLEventNotifyEvent
read FOnEvent
write FOnEvent;
end;
 
function THTMLEvent.GetTypeInfoCount(out Count: Integer): HResult;
begin
Result := E_NOTIMPL
end;
 
function THTMLEvent.GetTypeInfo(Index, LocaleID: Integer;
out TypeInfo): HResult;
begin
Result := E_NOTIMPL
end;
 
function THTMLEvent.GetIDsOfNames(const IID: TGUID; Names: Pointer;
NameCount, LocaleID: Integer; DispIDs: Pointer): HResult;
begin
Result := E_NOTIMPL
end;
 
function THTMLEvent.Invoke(DispID: Integer; const IID: TGUID;
LocaleID: Integer; Flags: Word; var Params; VarResult,
ExcepInfo, ArgErr: Pointer): HResult;
begin
DoEvent;
Result := S_OK;
end;
 
constructor THTMLEvent.Create(Document: IHTMLDocument2);
begin
inherited Create;
FDocument := Document;
FOnEvent := nil;
end;
 
procedure THTMLEvent.DoEvent;
var
EventObj: IHTMLEventObj;
EventType: string;
begin
if Assigned(FOnEvent) then
begin
EventObj := nil;
EventType := '';
if Assigned(FDocument) and Assigned(FDocument.parentWindow) then
begin
EventObj := FDocument.parentWindow.event;
if Assigned(EventObj) then
EventType := EventObj.type_;
end;
 
FOnEvent(EventObj, EventType);
end;
end;
 
//The following code demonstrates how to use the class:
 
procedure TForm1.Button1Click(Sender: TObject);
var
Doc: IHTMLDocument2;
EventHandler: THTMLEvent;
begin
// Load Document in Browser
WebBrowser1.Navigate('http://www.nineberry.de');
repeat
application.ProcessMessages;
until WebBrowser1.ReadyState >= READYSTATE_COMPLETE;
 
// Create our Object, that will handle events
Doc := WebBrowser1.Document as IHTMLDocument2;
EventHandler := THTMLEvent.Create(Doc);
EventHandler.OnEvent := KeyEvent;
 
// Assign Events
Doc.onkeydown := EventHandler as IDispatch;
Doc.onkeypress := EventHandler as IDispatch;
Doc.onkeyup := EventHandler as IDispatch;
end;
 
procedure TForm1.KeyEvent(EventObject: IHTMLEventObj;
EventType: string);
begin
// Handle Event, show type of event and keycode
Memo1.Lines.Add('Type of Event: ' + EventType);
Memo1.Lines.Add('Keycode of Key: ' +
IntToStr(EventObject.keyCode));
Memo1.Lines.Add('Char: ' + WideChar(EventObject.keyCode));
end;