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CEF4Delphi/demos/JavaScript/JSExtensionWithFunction/uJSExtensionWithFunction.pas

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// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF3 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 � 2018 Salvador D�az 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 uJSExtensionWithFunction;
{$I cef.inc}
interface
uses
{$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, Vcl.ComCtrls,
{$ELSE}
Windows, Messages, SysUtils, Variants, Classes, Graphics,
Controls, Forms, Dialogs, StdCtrls, ExtCtrls, ComCtrls,
{$ENDIF}
uCEFChromium, uCEFWindowParent, uCEFInterfaces, uCEFApplication, uCEFTypes, uCEFConstants;
type
TJSExtensionWithFunctionFrm = class(TForm)
NavControlPnl: TPanel;
Edit1: TEdit;
GoBtn: TButton;
CEFWindowParent1: TCEFWindowParent;
Chromium1: TChromium;
Timer1: TTimer;
StatusBar1: TStatusBar;
procedure FormShow(Sender: TObject);
procedure GoBtnClick(Sender: TObject);
procedure Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
procedure Timer1Timer(Sender: TObject);
procedure Chromium1BeforePopup(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame; const targetUrl,
targetFrameName: ustring;
targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean;
var popupFeatures: TCefPopupFeatures; var windowInfo: TCefWindowInfo;
var client: ICefClient; var settings: TCefBrowserSettings;
var noJavascriptAccess: Boolean; out Result: Boolean);
procedure Chromium1ProcessMessageReceived(Sender: TObject;
const browser: ICefBrowser; sourceProcess: TCefProcessId;
const message: ICefProcessMessage; out Result: Boolean);
protected
procedure BrowserCreatedMsg(var aMessage : TMessage); message CEF_AFTERCREATED;
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;
public
{ Public declarations }
end;
var
JSExtensionWithFunctionFrm: TJSExtensionWithFunctionFrm;
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procedure GlobalCEFApp_OnWebKitInitializedEvent;
implementation
{$R *.dfm}
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uses
uCEFMiscFunctions, uMyV8Handler;
// The CEF3 document describing JavaScript integration is here :
// https://bitbucket.org/chromiumembedded/cef/wiki/JavaScriptIntegration.md
// The HTML file in this demo has a button that shows the contents of 'test.myfunc()'
// which was registered in the GlobalCEFApp.OnWebKitInitialized event.
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procedure GlobalCEFApp_OnWebKitInitializedEvent;
var
TempExtensionCode : string;
TempHandler : ICefv8Handler;
begin
// This is the JS extension example with a function in the "JavaScript Integration" wiki page at
// https://bitbucket.org/chromiumembedded/cef/wiki/JavaScriptIntegration.md
TempExtensionCode := 'var test;' +
'if (!test)' +
' test = {};' +
'(function() {' +
' test.myfunc = function() {' +
' native function myfunc();' +
' return myfunc();' +
' };' +
'})();';
TempHandler := TMyV8Handler.Create;
CefRegisterExtension('v8/test', TempExtensionCode, TempHandler);
end;
procedure TJSExtensionWithFunctionFrm.GoBtnClick(Sender: TObject);
begin
Chromium1.LoadURL(Edit1.Text);
end;
procedure TJSExtensionWithFunctionFrm.Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
begin
PostMessage(Handle, CEF_AFTERCREATED, 0, 0);
end;
procedure TJSExtensionWithFunctionFrm.Chromium1BeforePopup(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame; const targetUrl,
targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition;
userGesture: Boolean; var popupFeatures: TCefPopupFeatures;
var windowInfo: TCefWindowInfo; var client: ICefClient;
var settings: TCefBrowserSettings; var noJavascriptAccess: Boolean;
out 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 TJSExtensionWithFunctionFrm.Chromium1ProcessMessageReceived(
Sender: TObject; const browser: ICefBrowser;
sourceProcess: TCefProcessId; const message: ICefProcessMessage;
out Result: Boolean);
begin
if (message.Name = TEST_MESSAGE_NAME) then
begin
StatusBar1.Panels[0].Text := DateTimeToStr(now) + ' - ' + message.ArgumentList.GetString(0); // this doesn't create/destroy components
Result := True;
end
end;
procedure TJSExtensionWithFunctionFrm.FormShow(Sender: TObject);
begin
// 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(Chromium1.CreateBrowser(CEFWindowParent1, '')) then Timer1.Enabled := True;
end;
procedure TJSExtensionWithFunctionFrm.WMMove(var aMessage : TWMMove);
begin
inherited;
if (Chromium1 <> nil) then Chromium1.NotifyMoveOrResizeStarted;
end;
procedure TJSExtensionWithFunctionFrm.WMMoving(var aMessage : TMessage);
begin
inherited;
if (Chromium1 <> nil) then Chromium1.NotifyMoveOrResizeStarted;
end;
procedure TJSExtensionWithFunctionFrm.Timer1Timer(Sender: TObject);
begin
Timer1.Enabled := False;
if not(Chromium1.CreateBrowser(CEFWindowParent1, '')) and not(Chromium1.Initialized) then
Timer1.Enabled := True;
end;
procedure TJSExtensionWithFunctionFrm.BrowserCreatedMsg(var aMessage : TMessage);
begin
Caption := 'JSExtensionWithFunction';
CEFWindowParent1.UpdateSize;
NavControlPnl.Enabled := True;
GoBtn.Click;
end;
procedure TJSExtensionWithFunctionFrm.WMEnterMenuLoop(var aMessage: TMessage);
begin
inherited;
if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := True;
end;
procedure TJSExtensionWithFunctionFrm.WMExitMenuLoop(var aMessage: TMessage);
begin
inherited;
if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := False;
end;
end.