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[Delphi]在TWebBrowser中接收Enter键

2008-04-11 12:26:34来源：互联网阅读 ()

默认的情况下Delphi的TwebBrowser控件是不支持Enter的，这使一些多行文本框变得无法录入，解决的办法如下：

unit Unit1;

interface

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

type
TForm1 = class(TForm)
WebBrowser1: TWebBrowser;
Button1: TButton;
Button2: TButton;
procedure FormDestroy(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
FOleInPlaceActiveObject: IOleInPlaceActiveObject;
procedure MsgHandler(var Msg: TMsg; var Handled: Boolean);
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormDestroy(Sender: TObject);
begin
FOleInPlaceActiveObject := nil;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
Application.OnMessage := MsgHandler;
end;

procedure TForm1.MsgHandler(var Msg: TMsg; var Handled: Boolean);
const
DialogKeys: set of Byte = [VK_LEFT, VK_RIGHT, VK_BACK, VK_UP, VK_DOWN,
$30..$39, $41..42, $44..$55, $57, $59..$5A];
var
iOIPAO: IOleInPlaceActiveObject;
Dispatch: IDispatch;
begin
{ exit if we don''''t get back a webbrowser object }
if (WebBrowser1 = nil) then
begin
Handled := System.False;
Exit;
end;

Handled := (IsDialogMessage(WebBrowser1.Handle, Msg) = System.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 in DialogKeys) then
// nothing - do not pass on the DialogKeys
else
FOleInPlaceActiveObject.TranslateAccelerator(Msg);
end;
end;

initialization
OleInitialize(nil);

finalization
OleUninitialize;

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