// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF to embed a chromium-based
// browser in Delphi applications.
//
// The original license of DCEF3 still applies to CEF4Delphi.
//
// For more information about CEF4Delphi visit :
// https://www.briskbard.com/index.php?lang=en&pageid=cef
//
// Copyright © 2023 Salvador Diaz Fau. All rights reserved.
//
// ************************************************************************
// ************ vvvv Original license and comments below vvvv *************
// ************************************************************************
(*
* Delphi Chromium Embedded 3
*
* Usage allowed under the restrictions of the Lesser GNU General Public License
* or alternatively the restrictions of the Mozilla Public License 1.1
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* Unit owner : Henri Gourvest <hgourvest@gmail.com>
* Web site : http://www.progdigy.com
* Repository : http://code.google.com/p/delphichromiumembedded/
* Group : http://groups.google.com/group/delphichromiumembedded
*
* Embarcadero Technologies, Inc is not permitted to use or redistribute
* this source code without explicit permission.
*
*)
unit uJSDialogBrowser;
{$I cef.inc}
interface
uses
{$IFDEF DELPHI16_UP}
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls, System.SyncObjs, System.UITypes,
{$ELSE}
Windows, Messages, SysUtils, Variants, Classes, Graphics,
Controls, Forms, Dialogs, StdCtrls, ExtCtrls, SyncObjs,
{$ENDIF}
uCEFChromium, uCEFWindowParent, uCEFChromiumWindow, uCEFInterfaces, uCEFTypes, uCEFConstants,
uCEFWinControl, uCEFSentinel;
const
CEFBROWSER_SHOWJSDIALOG = WM_APP + $101;
type
TJSDialogBrowserFrm = class(TForm)
ChromiumWindow1: TChromiumWindow;
AddressPnl: TPanel;
AddressEdt: TEdit;
GoBtn: TButton;
Timer1: TTimer;
procedure GoBtnClick(Sender: TObject);
procedure FormShow(Sender: TObject);
procedure ChromiumWindow1AfterCreated(Sender: TObject);
procedure Timer1Timer(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
procedure ChromiumWindow1Close(Sender: TObject);
procedure ChromiumWindow1BeforeClose(Sender: TObject);
procedure CEFSentinel1Close(Sender: TObject);
protected
FJSDialogInfoCS : TCriticalSection;
FOriginUrl : ustring;
FMessageText : ustring;
FDefaultPromptText : ustring;
FPendingDlg : boolean;
FDialogType : TCefJsDialogType;
FCallback : ICefJsDialogCallback;
// Variables to control when can we destroy the form safely
FCanClose : boolean; // Set to True in TChromium.OnBeforeClose
FClosing : boolean; // Set to True in the CloseQuery event.
procedure Chromium_OnJsdialog(Sender: TObject; const browser: ICefBrowser; const originUrl: ustring; dialogType: TCefJsDialogType; const messageText, defaultPromptText: ustring; const callback: ICefJsDialogCallback; out suppressMessage: Boolean; out Result: Boolean);
procedure Chromium_OnBeforePopup(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const targetUrl, targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; const popupFeatures: TCefPopupFeatures; var windowInfo: TCefWindowInfo; var client: ICefClient; var settings: TCefBrowserSettings; var extra_info: ICefDictionaryValue; var noJavascriptAccess: Boolean; var Result: Boolean);
procedure WMMove(var aMessage : TWMMove); message WM_MOVE;
procedure WMMoving(var aMessage : TMessage); message WM_MOVING;
procedure WMEnterMenuLoop(var aMessage: TMessage); message WM_ENTERMENULOOP;
procedure WMExitMenuLoop(var aMessage: TMessage); message WM_EXITMENULOOP;
procedure ShowJSDialogMsg(var aMessage: TMessage); message CEFBROWSER_SHOWJSDIALOG;
end;
var
JSDialogBrowserFrm: TJSDialogBrowserFrm;
procedure CreateGlobalCEFApp;
implementation
{$R *.dfm}
uses
uCEFApplication;
// This is a demo with custom JS dialogs
// Destruction steps
// =================
// 1. The FormCloseQuery event sets CanClose to False and calls TChromiumWindow.CloseBrowser, which triggers the TChromiumWindow.OnClose event.
// 2. The TChromiumWindow.OnClose event calls TChromiumWindow.DestroyChildWindow which triggers the TChromiumWindow.OnBeforeClose event.
// 3. TChromiumWindow.OnBeforeClose sets FCanClose := True and sends WM_CLOSE to the form.
procedure CreateGlobalCEFApp;
begin
GlobalCEFApp := TCefApplication.Create;
//GlobalCEFApp.LogFile := 'cef.log';
//GlobalCEFApp.LogSeverity := LOGSEVERITY_VERBOSE;
end;
procedure TJSDialogBrowserFrm.FormCreate(Sender: TObject);
begin
FJSDialogInfoCS := TCriticalSection.Create;
FOriginUrl := '';
FMessageText := '';
FDefaultPromptText := '';
FPendingDlg := False;
FDialogType := JSDIALOGTYPE_ALERT;
FCallback := nil;
FCanClose := False;
FClosing := False;
end;
procedure TJSDialogBrowserFrm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
CanClose := FCanClose;
if not(FClosing) then
begin
FClosing := True;
Visible := False;
ChromiumWindow1.CloseBrowser(True);
end;
end;
procedure TJSDialogBrowserFrm.FormDestroy(Sender: TObject);
begin
FreeAndNil(FJSDialogInfoCS);
FCallback := nil;
end;
procedure TJSDialogBrowserFrm.FormShow(Sender: TObject);
begin
ChromiumWindow1.ChromiumBrowser.OnJsdialog := Chromium_OnJsdialog;
ChromiumWindow1.ChromiumBrowser.OnBeforePopup := Chromium_OnBeforePopup;
// GlobalCEFApp.GlobalContextInitialized has to be TRUE before creating any browser
// If it's not initialized yet, we use a simple timer to create the browser later.
if not(ChromiumWindow1.CreateBrowser) then Timer1.Enabled := True;
end;
procedure TJSDialogBrowserFrm.CEFSentinel1Close(Sender: TObject);
begin
FCanClose := True;
PostMessage(Handle, WM_CLOSE, 0, 0);
end;
procedure TJSDialogBrowserFrm.ChromiumWindow1AfterCreated(Sender: TObject);
begin
Caption := 'JS Dialog Browser';
AddressPnl.Enabled := True;
GoBtn.Click;
end;
procedure TJSDialogBrowserFrm.GoBtnClick(Sender: TObject);
begin
ChromiumWindow1.LoadURL(AddressEdt.Text);
end;
procedure TJSDialogBrowserFrm.Timer1Timer(Sender: TObject);
begin
Timer1.Enabled := False;
if not(ChromiumWindow1.CreateBrowser) and not(ChromiumWindow1.Initialized) then
Timer1.Enabled := True;
end;
procedure TJSDialogBrowserFrm.WMMove(var aMessage : TWMMove);
begin
inherited;
if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
end;
procedure TJSDialogBrowserFrm.WMMoving(var aMessage : TMessage);
begin
inherited;
if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
end;
procedure TJSDialogBrowserFrm.WMEnterMenuLoop(var aMessage: TMessage);
begin
inherited;
if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := True;
end;
procedure TJSDialogBrowserFrm.WMExitMenuLoop(var aMessage: TMessage);
begin
inherited;
if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := False;
end;
procedure TJSDialogBrowserFrm.Chromium_OnJsdialog(Sender : TObject;
const browser : ICefBrowser;
const originUrl : ustring;
dialogType : TCefJsDialogType;
const messageText : ustring;
const defaultPromptText : ustring;
const callback : ICefJsDialogCallback;
out suppressMessage : Boolean;
out Result : Boolean);
begin
// In this event we must store the dialog information and post a message to the main form to show the dialog
FJSDialogInfoCS.Acquire;
if FPendingDlg then
begin
Result := False;
suppressMessage := True;
end
else
begin
FOriginUrl := originUrl;
FMessageText := messageText;
FDefaultPromptText := defaultPromptText;
FDialogType := dialogType;
FCallback := callback;
FPendingDlg := True;
Result := True;
suppressMessage := False;
PostMessage(Handle, CEFBROWSER_SHOWJSDIALOG, 0, 0);
end;
FJSDialogInfoCS.Release;
end;
procedure TJSDialogBrowserFrm.ChromiumWindow1BeforeClose(Sender: TObject);
begin
FCanClose := True;
PostMessage(Handle, WM_CLOSE, 0, 0);
end;
procedure TJSDialogBrowserFrm.ChromiumWindow1Close(Sender: TObject);
begin
// DestroyChildWindow will destroy the child window created by CEF at the top of the Z order.
if not(ChromiumWindow1.DestroyChildWindow) then
begin
FCanClose := True;
PostMessage(Handle, WM_CLOSE, 0, 0);
end;
end;
procedure TJSDialogBrowserFrm.Chromium_OnBeforePopup(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame; const targetUrl,
targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition;
userGesture: Boolean; const popupFeatures: TCefPopupFeatures;
var windowInfo: TCefWindowInfo; var client: ICefClient;
var settings: TCefBrowserSettings;
var extra_info: ICefDictionaryValue;
var noJavascriptAccess: Boolean;
var Result: Boolean);
begin
// For simplicity, this demo blocks all popup windows and new tabs
Result := (targetDisposition in [WOD_NEW_FOREGROUND_TAB, WOD_NEW_BACKGROUND_TAB, WOD_NEW_POPUP, WOD_NEW_WINDOW]);
end;
procedure TJSDialogBrowserFrm.ShowJSDialogMsg(var aMessage: TMessage);
var
TempCaption : string;
begin
// Here we show the dialog and reset the information.
// showmessage, MessageDlg and InputBox should be replaced by nicer custom forms with the same functionality.
FJSDialogInfoCS.Acquire;
if FPendingDlg then
begin
TempCaption := 'JavaScript message from : ' + FOriginUrl;
case FDialogType of
JSDIALOGTYPE_ALERT : showmessage(TempCaption + CRLF + CRLF + FMessageText);
JSDIALOGTYPE_CONFIRM : FCallback.cont((MessageDlg(TempCaption + CRLF + CRLF + FMessageText, mtConfirmation, [mbYes, mbNo], 0, mbYes) = mrYes), '');
JSDIALOGTYPE_PROMPT : FCallback.cont(True, InputBox(TempCaption, FMessageText, FDefaultPromptText));
end;
end;
FOriginUrl := '';
FMessageText := '';
FDefaultPromptText := '';
FPendingDlg := False;
FDialogType := JSDIALOGTYPE_ALERT;
FCallback := nil;
FJSDialogInfoCS.Release;
end;
end.