Lost focus in an ActiveX form

Hi,

I have an Activex form but when I see it with  the TWebBrowser component the ActiveX losses the focus when I press cursor keys or tab key.

How can I hold the focus inside the ActiveX when I press the cursor keys or Tab key?

Note: If I see the ActiveX in IE the form works fine.

Thanks in advance
yonkaAsked:
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intheCommented:
hi
the twebbrowser has some problems with getting windows messages and the handling of them.generally you need to write a message handler for it so it knows what to do ,here is example that should pretty much work straight away:


unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, OleCtrls, SHDocVw_TLB,ActiveX;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    WebBrowser1: TWebBrowser;
    procedure Button1Click(Sender: TObject);
    procedure FormActivate(Sender: TObject);
    procedure FormDeactivate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private declarations }
  public
  procedure MyMessageHandler(var Msg: TMsg; var Handled: Boolean);

    { Public declarations }
  end;

var
  Form1: TForm1;
  FOleInPlaceActiveObject: IOleInPlaceActiveObject;
  SaveMessageHandler: TMessageEvent;


implementation

{$R *.DFM}

procedure TForm1.MyMessageHandler(var Msg: TMsg; var Handled: Boolean);
var
  iOIPAO: IOleInPlaceActiveObject;
  Dispatch: IDispatch;
begin
  { exit if we don't get back a webbrowser object }
  if WebBrowser1 = nil then
  begin
    Handled := False;
    Exit;
  end;

  Handled:=(IsDialogMessage(WebBrowser1.Handle, Msg) = True);

  if (Handled) and (not WebBrowser1.Busy) then
  begin
    if FOleInPlaceActiveObject = nil then
    begin
      Dispatch := WebBrowser1.Application_;
      if Dispatch <> nil then
      begin
        Dispatch.QueryInterface(IOleInPlaceActiveObject, iOIPAO);
        if iOIPAO <> nil then
          FOleInPlaceActiveObject := iOIPAO;
      end;
    end;

    if FOleInPlaceActiveObject <> nil then
      if ((Msg.message = WM_KEYDOWN) or (Msg.message = WM_KEYUP)) and
         ((Msg.wParam = VK_BACK) or (Msg.wParam = VK_LEFT)
              or (Msg.wParam = VK_RIGHT) or(Msg.wParam = VK_TAB)) then
   //either write a message handler for the particular message or do
     //nothing - do not pass on Backspace, Left or Right arrows or tab
      else
        FOleInPlaceActiveObject.TranslateAccelerator(Msg);
  end;
end;

procedure TForm1.FormActivate(Sender: TObject);
begin
  SaveMessageHandler := Application.OnMessage;
  Application.OnMessage := MyMessageHandler;

end;

procedure TForm1.FormDeactivate(Sender: TObject);
begin
Application.OnMessage := SaveMessageHandler;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
Application.OnMessage := SaveMessageHandler;
  FOleInPlaceActiveObject := nil;
end;

procedure TForm1.Button1Click(Sender: TObject);
var a,b,c,d:OleVariant;
begin
     WebBrowser1.Navigate(Edit1.Text,a,b,c,d);
end;

initialization
  OleInitialize(nil);

finalization
  OleUninitialize;

end.

let me know how you get on
Regards Barry
0

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yonkaAuthor Commented:
Hi inthe,

thanks, works, ... at last .. ;)

There is only one problem, tab key seems to work but the tab order is incorrect, in one form the tabkey works backwards, in other form jumps to a control in an incorrect order.
The up and down keys only work inside a control like a combo or a grid but not work simulating tab key in controls like TEdit.

thanks a lot
Diego
0
intheCommented:
these problems seem strange ..are they occurring inside the twebbrowser ?
or are these normal forms?
i know there are trooubles with normal forms and the vk_up/vk_down keys but tab should be ok..
is it possible to send me a demo of this problem so i can see?
0
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yonkaAuthor Commented:
The problems always are in the TWebBrowser.

If you make a ActiveForm from scrach with some TEdit and a TButton  and you try to see it in IE it works fine, but if you try to see it inside TWebBrowser with the message handler then the tab order is random.

I can't send you a demo because you need several MTS objects to run, but if your probe it from scrach (an activeform with 3 edit controls and a client with with your source code) you will see the tab key is mad.

I have Win NT 4.0 sp 5, Delphi 5, IE5.00.2314.5003.
0
intheCommented:
ok i shall make a demo later today and see if i can find the problem ;-)
0
intheCommented:
hi
please try this ,i think its what we after :


unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, OleCtrls, SHDocVw_TLB,ActiveX;

type
  TForm1 = class(TForm)
    WebBrowser1: TWebBrowser;
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    procedure Button1Click(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
   OIPAO  : IOleInPlaceActiveObject;
   OIPAO_Wnd:HWND;

  public
    { Public declarations }
    procedure MyMessageHandler(var Msg: TMsg; var Handled: Boolean);
  end;

var
  Form1: TForm1;
  SaveMessageHandler: TMessageEvent;
implementation

{$R *.DFM}

procedure Tform1.MyMessageHandler(var Msg: TMsg; var Handled: Boolean);
const
  DuplicatedKeys: set of Byte = [VK_TAB, VK_BACK, VK_LEFT, VK_RIGHT, VK_UP, VK_DOWN, VK_PRIOR, VK_NEXT];
var
   w:HWND;
begin
     Handled:=False;
     if Msg.message = WM_KEYDOWN then
     begin
          if Msg.wParam in DuplicatedKeys then
         //do nothing let ie take care of it
           end;
     w:=GetFocus;
     if (w=0) {or (w=[].Handle)} then Exit;
     if OIPAO<>nil then
     begin
          if w = OIPAO_Wnd then Handled := IsDialogMessage(w,Msg);
          if not Handled then Handled := (OIPAO.TranslateAccelerator(Msg) = S_OK);
     end;
     if (not Handled) and Assigned(SaveMessageHandler) then SaveMessageHandler(Msg,Handled); end;

procedure TForm1.FormCreate(Sender: TObject);
var
   Dispatch:IDispatch;
begin
    if assigned(WebBrowser1) then
     begin
          Dispatch := WebBrowser1.Application_;
          if Dispatch<>nil then
          begin
               Dispatch.QueryInterface(IOleInPlaceActiveObject, OIPAO);
          end;
          if OIPAO <> nil then OIPAO.GetWindow(OIPAO_Wnd);
     end;
     SaveMessagehandler := Application.OnMessage;
     Application.OnMessage:=MyMessageHandler;
 end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
OIPAO := nil;
Application.OnMessage := SaveMessageHandler;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
opendialog1.execute;
webbrowser1.OleObject.navigate(opendialog1.filename);
end;

initialization
  OleInitialize(nil);

finalization
  OleUninitialize;

end.

let me know if anything still doesnt work
Regards Barry
0
yonkaAuthor Commented:
Great!!!
It works great!!

Thanks a million!

Greetings from Spain.
Diego Pulido
diegop@pronet-ise.com



PD: Sorry, I don't have more points ... ;(
0
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