Fixed the CustomResourceHandler demo

- Added TCEFSentinel to more demos

demos/Lazarus/JavaScript/JSExecutingFunctions/JSExecutingFunctions.lps

@@ -22,8 +22,8 @@
         <ResourceBaseClass Value="Form"/>
         <IsVisibleTab Value="True"/>
         <EditorIndex Value="1"/>
-        <TopLine Value="174"/>
-        <CursorPos X="74" Y="179"/>
+        <TopLine Value="194"/>
+        <CursorPos X="22" Y="200"/>
         <UsageCount Value="20"/>
         <Loaded Value="True"/>
         <LoadedDesigner Value="True"/>
@@ -53,7 +53,7 @@
         <DefaultSyntaxHighlighter Value="Delphi"/>
       </Unit4>
     </Units>
-    <JumpHistory Count="9" HistoryIndex="8">
+    <JumpHistory Count="11" HistoryIndex="10">
       <Position1>
         <Filename Value="uJSExecutingFunctions.pas"/>
       </Position1>
@@ -89,6 +89,14 @@
         <Filename Value="uJSExecutingFunctions.pas"/>
         <Caret Line="116" Column="11" TopLine="100"/>
       </Position9>
+      <Position10>
+        <Filename Value="uJSExecutingFunctions.pas"/>
+        <Caret Line="140" Column="82" TopLine="138"/>
+      </Position10>
+      <Position11>
+        <Filename Value="uJSExecutingFunctions.pas"/>
+        <Caret Line="145" Column="82" TopLine="143"/>
+      </Position11>
     </JumpHistory>
     <RunParams>
       <FormatVersion Value="2"/>

demos/Lazarus/JavaScript/JSExecutingFunctions/uJSExecutingFunctions.lfm

@@ -72,4 +72,9 @@ object JSExecutingFunctionsFrm: TJSExecutingFunctionsFrm
     left = 32
     top = 288
   end
+  object CEFSentinel1: TCEFSentinel
+    OnClose = CEFSentinel1Close
+    left = 32
+    top = 352
+  end
 end

demos/Lazarus/JavaScript/JSExecutingFunctions/uJSExecutingFunctions.pas

@@ -52,7 +52,7 @@ uses
   Controls, Forms, Dialogs, StdCtrls, ExtCtrls, ComCtrls,
   {$ENDIF}
   uCEFChromium, uCEFWindowParent, uCEFInterfaces, uCEFApplication, uCEFTypes,
-  uCEFConstants, uCEFv8Value, uCEFWinControl;
+  uCEFConstants, uCEFv8Value, uCEFWinControl, uCEFSentinel;
 
 const
   JSDEMO_CONTEXTMENU_EXECFUNCTION = MENU_ID_USER_FIRST + 1;
@@ -60,13 +60,18 @@ const
   EXECFUNCTION_MSGNAME = 'execfunction';
 
 type
+
+  { TJSExecutingFunctionsFrm }
+
   TJSExecutingFunctionsFrm = class(TForm)
+    CEFSentinel1: TCEFSentinel;
     NavControlPnl: TPanel;
     Edit1: TEdit;
     GoBtn: TButton;
     CEFWindowParent1: TCEFWindowParent;
     Chromium1: TChromium;
     Timer1: TTimer;
+    procedure CEFSentinel1Close(Sender: TObject);
     procedure FormShow(Sender: TObject);
     procedure GoBtnClick(Sender: TObject);
     procedure Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
@@ -136,7 +141,8 @@ implementation
 // =================
 // 1. FormCloseQuery sets CanClose to FALSE calls TChromium.CloseBrowser which triggers the TChromium.OnClose event.
 // 2. TChromium.OnClose sends a CEFBROWSER_DESTROY message to destroy CEFWindowParent1 in the main thread, which triggers the TChromium.OnBeforeClose event.
-// 3. TChromium.OnBeforeClose sets FCanClose := True and sends WM_CLOSE to the form.
+// 3. TChromium.OnBeforeClose calls TCEFSentinel.Start, which will trigger TCEFSentinel.OnClose when the renderer processes are closed.
+// 4. TCEFSentinel.OnClose sets FCanClose := True and sends WM_CLOSE to the form.
 
 uses
   uCEFProcessMessage, uMyV8Handler;
@@ -191,8 +197,7 @@ end;
 procedure TJSExecutingFunctionsFrm.Chromium1BeforeClose(Sender: TObject;
   const browser: ICefBrowser);
 begin
-  FCanClose := True;
-  PostMessage(Handle, WM_CLOSE, 0, 0);
+  CEFSentinel1.Start;
 end;
 
 procedure TJSExecutingFunctionsFrm.Chromium1BeforeContextMenu(
@@ -273,6 +278,12 @@ begin
   if not(Chromium1.CreateBrowser(CEFWindowParent1, '')) then Timer1.Enabled := True;
 end;
 
+procedure TJSExecutingFunctionsFrm.CEFSentinel1Close(Sender: TObject);
+begin
+  FCanClose := True;
+  PostMessage(Handle, WM_CLOSE, 0, 0);
+end;
+
 procedure TJSExecutingFunctionsFrm.WMMove(var aMessage : TWMMove);
 begin
   inherited;