// ************************************************************************
// ***************************** 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 © 2022 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 uMainForm;
{$I cef.inc}
interface
uses
{$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,
{$ELSE}
Windows, Messages, SysUtils, Variants, Classes, Graphics,
Controls, Forms, Dialogs, StdCtrls, ExtCtrls,
{$ENDIF}
uCEFChromium, uCEFWindowParent, uCEFChromiumWindow, uCEFInterfaces, uCustomResourceHandler,
uCEFConstants, uCEFTypes, uCEFWinControl, uCEFLinkedWinControlBase;
type
TMainForm = class(TForm)
ChromiumWindow1: TChromiumWindow;
AddressBarPnl: TPanel;
Edit1: TEdit;
Button1: TButton;
Timer1: TTimer;
procedure FormCreate(Sender: TObject);
procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
procedure FormShow(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Timer1Timer(Sender: TObject);
procedure ChromiumWindow1Close(Sender: TObject);
procedure ChromiumWindow1BeforeClose(Sender: TObject);
private
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;
protected
// 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.
FHandler : ICefResourceHandler;
procedure Chromium_OnAfterCreated(Sender: TObject);
procedure Chromium_OnGetResourceHandler(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; var aResourceHandler : ICefResourceHandler);
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);
public
{ Public declarations }
end;
var
MainForm: TMainForm;
procedure CreateGlobalCEFApp;
implementation
{$R *.dfm}
uses
uCEFMiscFunctions, uCEFApplication;
// 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 TMainForm.Button1Click(Sender: TObject);
begin
ChromiumWindow1.LoadURL(Edit1.Text);
end;
procedure TMainForm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
CanClose := FCanClose;
if not(FClosing) then
begin
FClosing := True;
Visible := False;
FHandler := nil;
ChromiumWindow1.CloseBrowser(True);
end;
end;
procedure TMainForm.FormCreate(Sender: TObject);
var
TempStream : TStringStream;
begin
TempStream := nil;
FCanClose := False;
FClosing := False;
try
try
TempStream := TStringStream.Create('<!DOCTYPE html><html><body><p>test</p></body></html>', TEncoding.UTF8, false);
FHandler := TCustomResourceHandler.Create(nil, nil, '', nil, TStream(TempStream), CefGetMimeType('html'));
except
on e : exception do
if CustomExceptionHandler('TMainForm.FormCreate', e) then raise;
end;
finally
if (TempStream <> nil) then FreeAndNil(TempStream);
end;
end;
procedure TMainForm.FormShow(Sender: TObject);
begin
ChromiumWindow1.OnAfterCreated := Chromium_OnAfterCreated;
ChromiumWindow1.ChromiumBrowser.OnGetResourceHandler := Chromium_OnGetResourceHandler;
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 TMainForm.Timer1Timer(Sender: TObject);
begin
Timer1.Enabled := False;
if not(ChromiumWindow1.CreateBrowser) and not(ChromiumWindow1.Initialized) then
Timer1.Enabled := True;
end;
procedure TMainForm.ChromiumWindow1BeforeClose(Sender: TObject);
begin
FCanClose := True;
PostMessage(Handle, WM_CLOSE, 0, 0);
end;
procedure TMainForm.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 TMainForm.Chromium_OnAfterCreated(Sender: TObject);
begin
ChromiumWindow1.UpdateSize;
AddressBarPnl.Enabled := True;
end;
procedure TMainForm.Chromium_OnGetResourceHandler( Sender : TObject;
const browser : ICefBrowser;
const frame : ICefFrame;
const request : ICefRequest;
var aResourceHandler : ICefResourceHandler);
begin
aResourceHandler := FHandler;
end;
procedure TMainForm.Chromium_OnBeforePopup( Sender : TObject;
const browser : ICefBrowser;
const frame : ICefFrame;
const targetUrl : ustring;
const 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 TMainForm.WMMove(var aMessage : TWMMove);
begin
inherited;
if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
end;
procedure TMainForm.WMMoving(var aMessage : TMessage);
begin
inherited;
if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
end;
procedure TMainForm.WMEnterMenuLoop(var aMessage: TMessage);
begin
inherited;
if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := True;
end;
procedure TMainForm.WMExitMenuLoop(var aMessage: TMessage);
begin
inherited;
if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := False;
end;
end.