mirror of
https://github.com/salvadordf/CEF4Delphi.git
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296 lines
11 KiB
ObjectPascal
296 lines
11 KiB
ObjectPascal
// ************************************************************************
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// ***************************** CEF4Delphi *******************************
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// ************************************************************************
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//
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// CEF4Delphi is based on DCEF3 which uses CEF to embed a chromium-based
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// browser in Delphi applications.
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//
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// The original license of DCEF3 still applies to CEF4Delphi.
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//
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// For more information about CEF4Delphi visit :
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// https://www.briskbard.com/index.php?lang=en&pageid=cef
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//
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// Copyright © 2023 Salvador Diaz Fau. All rights reserved.
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//
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// ************************************************************************
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// ************ vvvv Original license and comments below vvvv *************
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// ************************************************************************
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(*
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* Delphi Chromium Embedded 3
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*
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* Usage allowed under the restrictions of the Lesser GNU General Public License
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* or alternatively the restrictions of the Mozilla Public License 1.1
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
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* the specific language governing rights and limitations under the License.
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*
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* Unit owner : Henri Gourvest <hgourvest@gmail.com>
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* Web site : http://www.progdigy.com
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* Repository : http://code.google.com/p/delphichromiumembedded/
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* Group : http://groups.google.com/group/delphichromiumembedded
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*
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* Embarcadero Technologies, Inc is not permitted to use or redistribute
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* this source code without explicit permission.
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*
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*)
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unit uExternalPumpBrowser;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ExtCtrls, StdCtrls, LMessages,
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uCEFChromium, uCEFWindowParent, uCEFConstants, uCEFTypes, uCEFInterfaces,
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uCEFChromiumEvents, uCEFLinkedWindowParent, uCEFWorkScheduler;
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type
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{ TForm1 }
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TForm1 = class(TForm)
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AddressEdt: TEdit;
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CEFLinkedWindowParent1: TCEFLinkedWindowParent;
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GoBtn: TButton;
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Chromium1: TChromium;
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AddressPnl: TPanel;
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Timer1: TTimer;
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procedure CEFLinkedWindowParent1Enter(Sender: TObject);
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procedure CEFLinkedWindowParent1Exit(Sender: TObject);
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procedure Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
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procedure Chromium1BeforeClose(Sender: TObject; const browser: ICefBrowser);
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procedure Chromium1Close(Sender: TObject; const browser: ICefBrowser; var aAction: TCefCloseBrowserAction);
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procedure Chromium1BeforePopup(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);
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procedure Chromium1GotFocus(Sender: TObject; const browser: ICefBrowser);
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procedure Chromium1OpenUrlFromTab(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const targetUrl: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; out Result: Boolean);
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procedure FormCreate(Sender: TObject);
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procedure FormActivate(Sender: TObject);
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procedure FormCloseQuery(Sender: TObject; var CanClose: boolean);
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procedure GoBtnClick(Sender: TObject);
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procedure Timer1Timer(Sender: TObject);
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private
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protected
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// Variables to control when can we destroy the form safely
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FCanClose : boolean; // Set to True in TChromium.OnBeforeClose
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FClosing : boolean; // Set to True in the CloseQuery event.
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// CEF needs to handle these messages to call TChromium.NotifyMoveOrResizeStarted
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procedure WMMove(var Message: TLMMove); message LM_MOVE;
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procedure WMSize(var Message: TLMSize); message LM_SIZE;
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procedure WMWindowPosChanged(var Message: TLMWindowPosChanged); message LM_WINDOWPOSCHANGED;
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public
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end;
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var
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Form1: TForm1;
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procedure CreateGlobalCEFApp;
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implementation
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{$R *.lfm}
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// ATTENTION
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// =========
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// Since CEF 102 the Linux demos with the GlobalCEFApp.MultiThreadedMessageLoop
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// property set to FALSE and using GTK2 require a custom build of CEF binaries
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// with use_gtk=false set via GN_DEFINES.
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// This is a demo with the simplest web browser you can build using CEF4Delphi and
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// it doesn't show any sign of progress like other web browsers do.
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// Remember that it may take a few seconds to load if Windows update, your antivirus or
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// any other windows service is using your hard drive.
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// Depending on your internet connection it may take longer than expected.
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// Please check that your firewall or antivirus are not blocking this application
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// or the domain "google.com". If you don't live in the US, you'll be redirected to
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// another domain which will take a little time too.
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// This demo uses a TChromium and a TCEFLinkedWindowParent
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// We need to use TCEFLinkedWindowParent in Linux to update the browser
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// visibility and size automatically.
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// Destruction steps
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// =================
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// 1. FormCloseQuery sets CanClose to FALSE calls TChromium.CloseBrowser which triggers the TChromium.OnClose event.
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// 2. TChromium.OnClose sets aAction to cbaClose to destroy the browser, which triggers the TChromium.OnBeforeClose event.
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// 3. TChromium.OnBeforeClose sets FCanClose := True and sends CEF_BEFORECLOSE to close the form.
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uses
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uCEFApplication;
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{ TForm1 }
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procedure GlobalCEFApp_OnScheduleMessagePumpWork(const aDelayMS : int64);
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begin
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if (GlobalCEFWorkScheduler <> nil) then GlobalCEFWorkScheduler.ScheduleMessagePumpWork(aDelayMS);
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end;
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procedure CreateGlobalCEFApp;
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begin
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GlobalCEFApp := TCefApplication.Create;
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GlobalCEFApp.ExternalMessagePump := True;
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GlobalCEFApp.MultiThreadedMessageLoop := False;
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GlobalCEFApp.OnScheduleMessagePumpWork := @GlobalCEFApp_OnScheduleMessagePumpWork;
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// This is a workaround for the 'GPU is not usable error' issue :
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// https://bitbucket.org/chromiumembedded/cef/issues/2964/gpu-is-not-usable-error-during-cef
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GlobalCEFApp.DisableZygote := True; // this property adds the "--no-zygote" command line switch
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// TCEFWorkScheduler will call cef_do_message_loop_work when
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// it's told in the GlobalCEFApp.OnScheduleMessagePumpWork event.
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// GlobalCEFWorkScheduler needs to be created before the
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// GlobalCEFApp.StartMainProcess call.
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GlobalCEFWorkScheduler := TCEFWorkScheduler.Create(nil);
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end;
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procedure TForm1.FormCreate(Sender: TObject);
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begin
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FCanClose := False;
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FClosing := False;
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Chromium1.DefaultURL := UTF8Decode(AddressEdt.Text);
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end;
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procedure TForm1.GoBtnClick(Sender: TObject);
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begin
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Chromium1.LoadURL(UTF8Decode(AddressEdt.Text));
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end;
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procedure TForm1.Timer1Timer(Sender: TObject);
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begin
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Timer1.Enabled := False;
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if not(Chromium1.CreateBrowser(CEFLinkedWindowParent1.Handle, CEFLinkedWindowParent1.BoundsRect)) and
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not(Chromium1.Initialized) then
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Timer1.Enabled := True;
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end;
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procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: boolean);
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begin
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CanClose := FCanClose;
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if not(FClosing) then
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begin
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FClosing := True;
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Visible := False;
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Chromium1.CloseBrowser(True);
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end;
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end;
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procedure TForm1.Chromium1BeforePopup(Sender: TObject;
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const browser: ICefBrowser; const frame: ICefFrame; const targetUrl,
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targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition;
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userGesture: Boolean; const popupFeatures: TCefPopupFeatures;
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var windowInfo: TCefWindowInfo; var client: ICefClient;
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var settings: TCefBrowserSettings; var extra_info: ICefDictionaryValue;
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var noJavascriptAccess: Boolean; var Result: Boolean);
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begin
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// For simplicity, this demo blocks all popup windows and new tabs
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Result := (targetDisposition in [WOD_NEW_FOREGROUND_TAB, WOD_NEW_BACKGROUND_TAB, WOD_NEW_POPUP, WOD_NEW_WINDOW]);
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end;
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procedure TForm1.Chromium1OpenUrlFromTab(Sender: TObject;
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const browser: ICefBrowser; const frame: ICefFrame; const targetUrl: ustring;
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targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; out
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Result: Boolean);
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begin
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// For simplicity, this demo blocks all popup windows and new tabs
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Result := (targetDisposition in [WOD_NEW_FOREGROUND_TAB, WOD_NEW_BACKGROUND_TAB, WOD_NEW_POPUP, WOD_NEW_WINDOW]);
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end;
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procedure TForm1.FormActivate(Sender: TObject);
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begin
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// You *MUST* call CreateBrowser to create and initialize the browser.
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// This will trigger the AfterCreated event when the browser is fully
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// initialized and ready to receive commands.
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// GlobalCEFApp.GlobalContextInitialized has to be TRUE before creating any browser
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// If it's not initialized yet, we use a simple timer to create the browser later.
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// Linux needs a visible form to create a browser so we need to use the
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// TForm.OnActivate event instead of the TForm.OnShow event
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if not(Chromium1.Initialized) and
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not(Chromium1.CreateBrowser(CEFLinkedWindowParent1.Handle, CEFLinkedWindowParent1.BoundsRect)) then
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Timer1.Enabled := True;
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end;
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procedure TForm1.Chromium1Close(Sender: TObject; const browser: ICefBrowser; var aAction: TCefCloseBrowserAction);
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begin
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// continue closing the browser
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aAction := cbaClose;
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end;
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procedure TForm1.Chromium1BeforeClose(Sender: TObject; const browser: ICefBrowser);
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begin
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// We must wait until all browsers trigger the TChromium.OnBeforeClose event
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// in order to close the application safely or we will have shutdown issues.
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FCanClose := True;
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Close;
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end;
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procedure TForm1.Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
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begin
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// Now the browser is fully initialized we can initialize the UI.
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Caption := 'External Pump Browser';
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AddressPnl.Enabled := True;
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end;
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// This is a workaround for the CEF issue #2026
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// https://bitbucket.org/chromiumembedded/cef/issues/2026/multiple-major-keyboard-focus-issues-on
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// We use CEFLinkedWindowParent1.OnEnter, CEFLinkedWindowParent1.OnExit and
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// TChromium.OnGotFocus to avoid most of the focus issues.
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// CEFLinkedWindowParent1.TabStop must be TRUE.
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procedure TForm1.CEFLinkedWindowParent1Exit(Sender: TObject);
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begin
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if not(csDesigning in ComponentState) then
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Chromium1.SendCaptureLostEvent;
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end;
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procedure TForm1.CEFLinkedWindowParent1Enter(Sender: TObject);
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begin
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if not(csDesigning in ComponentState) and
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Chromium1.Initialized and
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not(Chromium1.FrameIsFocused) then
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Chromium1.SetFocus(True);
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end;
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procedure TForm1.Chromium1GotFocus(Sender: TObject; const browser: ICefBrowser);
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begin
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CEFLinkedWindowParent1.SetFocus;
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end;
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procedure TForm1.WMMove(var Message: TLMMove);
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begin
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inherited;
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Chromium1.NotifyMoveOrResizeStarted;
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end;
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procedure TForm1.WMSize(var Message: TLMSize);
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begin
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inherited;
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Chromium1.NotifyMoveOrResizeStarted;
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end;
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procedure TForm1.WMWindowPosChanged(var Message: TLMWindowPosChanged);
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begin
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inherited;
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Chromium1.NotifyMoveOrResizeStarted;
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end;
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end.
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