Make same app run on Win, Linux and Mac / Folder Lazarus_any_OS

demos/Lazarus_Mac/ExternalPumpBrowser/README.txt

@@ -1,24 +0,0 @@
-ExternalPumpBrowser
-
-# ABOUT
-
-This example uses 
-  TCEFLinkedWindowParent
-  TCEFWorkScheduler 
-
-TCEFWorkScheduler feeds the CEF messageloop by calling DoMessageLoopWork(). On Mac this is currently the only way to run the CEF messageloop.
-
-
-# SETUP
-
-1) Go to "project options" and create the "App Bundle"
-2) Download the CEF framework and place the content of the "Release" folder into ExternalPumpBrowser.app/Contents/Frameworks/Chromium Embedded Framework.framework
-You should have:
-  Chromium Embedded Framework
-  Libraries/*
-  Resources/*
-3) Open project "AppHelper", create App Bundle and compile the AppHelper.
-   Run create_mac_helper.sh
-4) Open project ExternalPumpBrowser, compile and run
-
-

demos/Lazarus_any_OS/ExternalPumpBrowser/ExternalPumpBrowser.lpi

@@ -1,8 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <CONFIG>
   <ProjectOptions>
-    <Version Value="11"/>
+    <Version Value="12"/>
     <General>
+      <Flags>
+        <CompatibilityMode Value="True"/>
+      </Flags>
       <SessionStorage Value="InProjectDir"/>
       <MainUnit Value="0"/>
       <Title Value="External Pump Browser"/>
@@ -33,7 +36,7 @@
         <PackageName Value="LCL"/>
       </Item2>
     </RequiredPackages>
-    <Units Count="3">
+    <Units Count="4">
       <Unit0>
         <Filename Value="ExternalPumpBrowser.lpr"/>
         <IsPartOfProject Value="True"/>
@@ -46,10 +49,15 @@
         <ResourceBaseClass Value="Form"/>
       </Unit1>
       <Unit2>
-        <Filename Value="interfaces.pas"/>
+        <Filename Value="initsubprocess.pas"/>
         <IsPartOfProject Value="True"/>
-        <UnitName Value="Interfaces"/>
+        <UnitName Value="InitSubProcess"/>
       </Unit2>
+      <Unit3>
+        <Filename Value="globalcefapplication.pas"/>
+        <IsPartOfProject Value="True"/>
+        <UnitName Value="GlobalCefApplication"/>
+      </Unit3>
     </Units>
   </ProjectOptions>
   <CompilerOptions>

demos/Lazarus_any_OS/ExternalPumpBrowser/ExternalPumpBrowser.lpr

@@ -56,9 +56,12 @@ uses
   {$IFDEF UNIX}{$IFDEF UseCThreads}
   cthreads,
   {$ENDIF}{$ENDIF}
+  {$IFDEF LINUX}
+  InitSubProcess, // On Linux this unit must be used *before* the "interfaces" unit.
+  {$ENDIF}
   Interfaces,
-  uExternalPumpBrowser,
+  Forms,
-  Forms
+  uExternalPumpBrowser, GlobalCefApplication
   { you can add units after this }
   ;
 

demos/Lazarus_any_OS/ExternalPumpBrowser/README.txt

@@ -0,0 +1,40 @@
+ExternalPumpBrowser
+
+# ABOUT
+
+This example uses 
+  TCEFLinkedWindowParent
+  TCEFWorkScheduler 
+
+TCEFWorkScheduler feeds the CEF messageloop by calling DoMessageLoopWork(). On Mac this is currently the only way to run the CEF messageloop.
+
+
+# SETUP
+
+** Windows
+1) Download the CEF framework and place the content of the "Release" folder into the same folder as your exe.
+  Alternatively you can point "GlobalCEFApp.FrameworkDirPath" to the location with the libraries.
+2) Run the project
+
+** Linux
+1) Download the CEF framework and place the content of the "Release" folder into the same folder as your exe.
+  Alternatively you can point "GlobalCEFApp.FrameworkDirPath" to the location with the libraries.
+2) Run the project
+
+Note:
+- For your own Linux project you must modify the project source (lpr) and add "InitSubProcess" to the "uses" clause, so that it is in the list *before* the unit "Interfaces".
+- The call to "DestroyGlobalCEFApp" must be in a unit *not* used by "unit InitSubProcess" (including not used in any nested way).
+
+
+** Mac
+1) Go to "project options" and create the "App Bundle"
+2) Download the CEF framework and place the content of the "Release" folder into ExternalPumpBrowser.app/Contents/Frameworks/Chromium Embedded Framework.framework
+You should have:
+  Chromium Embedded Framework
+  Libraries/*
+  Resources/*
+3) Open project "AppHelper", create App Bundle and compile the AppHelper.
+   Run create_mac_helper.sh
+4) Open project ExternalPumpBrowser, compile and run
+
+

demos/Lazarus_any_OS/ExternalPumpBrowser/globalcefapplication.pas

@@ -0,0 +1,47 @@
+unit GlobalCefApplication;
+
+{$mode ObjFPC}{$H+}
+
+interface
+
+uses
+  uCEFApplication, uCEFWorkScheduler;
+
+procedure CreateGlobalCEFApp;
+
+implementation
+
+procedure GlobalCEFApp_OnScheduleMessagePumpWork(const aDelayMS : int64);
+begin
+  if (GlobalCEFWorkScheduler <> nil) then GlobalCEFWorkScheduler.ScheduleMessagePumpWork(aDelayMS);
+end;
+
+procedure CreateGlobalCEFApp;
+begin
+  if GlobalCEFApp <> nil then
+    exit;
+
+  // TCEFWorkScheduler will call cef_do_message_loop_work when
+  // it's told in the GlobalCEFApp.OnScheduleMessagePumpWork event.
+  // GlobalCEFWorkScheduler needs to be created before the
+  // GlobalCEFApp.StartMainProcess call.
+  GlobalCEFWorkScheduler := TCEFWorkScheduler.Create(nil);
+
+  GlobalCEFApp                           := TCefApplication.Create;
+  GlobalCEFApp.ExternalMessagePump       := True;
+  GlobalCEFApp.MultiThreadedMessageLoop  := False;
+  GlobalCEFApp.OnScheduleMessagePumpWork := @GlobalCEFApp_OnScheduleMessagePumpWork;
+
+  {$IFDEF LINUX}
+  // This is a workaround for the 'GPU is not usable error' issue :
+  // https://bitbucket.org/chromiumembedded/cef/issues/2964/gpu-is-not-usable-error-during-cef
+  GlobalCEFApp.DisableZygote := True; // this property adds the "--no-zygote" command line switch
+  {$ENDIF}
+  {
+  GlobalCEFApp.LogFile     := 'cef.log';
+  GlobalCEFApp.LogSeverity := LOGSEVERITY_VERBOSE;
+  }
+end;
+
+end.
+

demos/Lazarus_any_OS/ExternalPumpBrowser/initsubprocess.pas

@@ -0,0 +1,55 @@
+// ************************************************************************
+// ***************************** 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 © 2021 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 InitSubProcess;
+
+{$mode ObjFPC}{$H+}
+
+interface
+
+uses
+  GlobalCefApplication, uCEFApplication;
+
+implementation
+
+initialization
+  CreateGlobalCEFApp;
+  if not GlobalCEFApp.StartMainProcess then
+    halt(0); // exit the subprocess
+
+end.
+

demos/Lazarus_any_OS/ExternalPumpBrowser/uExternalPumpBrowser.pas

@@ -42,6 +42,7 @@ unit uExternalPumpBrowser;
 interface
 
 uses
+  GlobalCefApplication,
   Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ExtCtrls, StdCtrls, LMessages,
   uCEFChromium, uCEFWindowParent, uCEFConstants, uCEFTypes, uCEFInterfaces,
   uCEFChromiumEvents, uCEFLinkedWindowParent, uCEFWorkScheduler;
@@ -97,7 +98,6 @@ type
 var
   Form1: TForm1;
 
-procedure CreateGlobalCEFApp;
 
 implementation
 
@@ -131,30 +131,6 @@ uses
 
 { TForm1 }
 
-procedure GlobalCEFApp_OnScheduleMessagePumpWork(const aDelayMS : int64);
-begin
-  if (GlobalCEFWorkScheduler <> nil) then GlobalCEFWorkScheduler.ScheduleMessagePumpWork(aDelayMS);
-end;
-
-procedure CreateGlobalCEFApp;
-begin                          
-  // TCEFWorkScheduler will call cef_do_message_loop_work when
-  // it's told in the GlobalCEFApp.OnScheduleMessagePumpWork event.
-  // GlobalCEFWorkScheduler needs to be created before the
-  // GlobalCEFApp.StartMainProcess call.
-  GlobalCEFWorkScheduler := TCEFWorkScheduler.Create(nil);
-
-  GlobalCEFApp                           := TCefApplication.Create;
-  GlobalCEFApp.ExternalMessagePump       := True;
-  GlobalCEFApp.MultiThreadedMessageLoop  := False;
-  GlobalCEFApp.OnScheduleMessagePumpWork := @GlobalCEFApp_OnScheduleMessagePumpWork;
-
-  {
-  GlobalCEFApp.LogFile     := 'cef.log';
-  GlobalCEFApp.LogSeverity := LOGSEVERITY_VERBOSE;
-  }
-end;
-
 procedure TForm1.FormCreate(Sender: TObject);
 begin
   FCanClose   := False;
@@ -219,7 +195,10 @@ end;
 procedure TForm1.Chromium1Close(Sender: TObject; const browser: ICefBrowser; var aAction: TCefCloseBrowserAction);
 begin
   // continue closing the browser
-  aAction := cbaClose;
+  if CEFLinkedWindowParent1.DestroyChildWindow then
+    aAction := cbaDelay
+  else
+    aAction := cbaClose;
 end;
 
 procedure TForm1.Chromium1BeforeClose(Sender: TObject; const browser: ICefBrowser);
@@ -295,11 +274,15 @@ begin
 end;
 
 initialization
-  CreateGlobalCEFApp;
+  if GlobalCEFApp = nil then begin
-  GlobalCEFApp.StartMainProcess;
+    CreateGlobalCEFApp;
+    if not GlobalCEFApp.StartMainProcess then
+      halt(0); // exit the subprocess
+  end;
 
 finalization
-    DestroyGlobalCEFApp;
+  (* Destroy from this unit, which is used after "Interfaces". So this happens before the Application object is destroyed *)
+  DestroyGlobalCEFApp;
 
 end.