Added TabbedBrowser2 demo for Linux

Update the TCEFBitmapBitBuffer size instead of destrying and creating it when the browser is resized.

demos/Lazarus_Linux/TabbedBrowser2/uBrowserTab.pas

@@ -0,0 +1,149 @@
+// ************************************************************************
+// ***************************** 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 uBrowserTab;
+
+{$mode objfpc}{$H+}
+
+{$I cef.inc}
+
+interface
+
+uses
+  LCLIntf, LCLType, LMessages, Classes, Messages, ComCtrls, Controls,
+  Forms,
+  uBrowserFrame;
+
+type
+  TBrowserTab = class(TTabSheet)
+    protected
+      FBrowserFrame : TBrowserFrame;
+      FTabID        : cardinal;
+
+      function    GetParentForm : TCustomForm;
+
+      procedure   SendFormMessage(aMsg : cardinal; aData : PtrInt = 0);
+
+      procedure   BrowserFrame_OnBrowserDestroyed(Sender: TObject);
+      procedure   BrowserFrame_OnBrowserTitleChange(Sender: TObject; const aTitle : string);
+
+      property    ParentForm : TCustomForm  read GetParentForm;
+
+    public
+      constructor Create(AOwner: TComponent; aTabID : cardinal; const aCaption : string); reintroduce;
+      procedure   NotifyMoveOrResizeStarted;
+      procedure   CreateBrowser(const aHomepage : string);
+      procedure   CloseBrowser;
+
+      property    TabID      : cardinal   read FTabID;
+  end;
+
+implementation
+
+uses
+  uMainForm;
+
+constructor TBrowserTab.Create(AOwner: TComponent; aTabID : cardinal; const aCaption : string);
+begin
+  inherited Create(AOwner);
+
+  FTabID        := aTabID;
+  Caption       := aCaption;
+  FBrowserFrame := nil;
+end;
+
+function TBrowserTab.GetParentForm : TCustomForm;
+var
+  TempParent : TWinControl;
+begin
+  TempParent := Parent;
+
+  while (TempParent <> nil) and not(TempParent is TCustomForm) do
+    TempParent := TempParent.Parent;
+
+  if (TempParent <> nil) and (TempParent is TCustomForm) then
+    Result := TCustomForm(TempParent)
+   else
+    Result := nil;
+end;
+
+procedure TBrowserTab.SendFormMessage(aMsg : cardinal; aData : PtrInt);
+var
+  TempForm : TCustomForm;
+begin
+  TempForm := ParentForm;
+  if (TempForm <> nil) and (TempForm is TMainForm) then
+    TMainForm(TempForm).SendCompMessage(aMsg, aData);
+end;
+
+procedure TBrowserTab.NotifyMoveOrResizeStarted;
+begin
+  FBrowserFrame.NotifyMoveOrResizeStarted;
+end;
+
+procedure TBrowserTab.CreateBrowser(const aHomepage : string);
+begin
+  FBrowserFrame                      := TBrowserFrame.Create(self);
+  FBrowserFrame.Parent               := self;
+  FBrowserFrame.Align                := alClient;
+  FBrowserFrame.Visible              := True;
+  FBrowserFrame.Homepage             := aHomepage;
+  FBrowserFrame.OnBrowserDestroyed   := @BrowserFrame_OnBrowserDestroyed;
+  FBrowserFrame.OnBrowserTitleChange := @BrowserFrame_OnBrowserTitleChange;
+
+  FBrowserFrame.CreateBrowser;
+end;
+
+procedure TBrowserTab.CloseBrowser;
+begin
+  if (FBrowserFrame <> nil) then FBrowserFrame.CloseBrowser;
+end;
+
+procedure TBrowserTab.BrowserFrame_OnBrowserDestroyed(Sender: TObject);
+begin                        
+  // This event is executed in a CEF thread so we have to use
+  // Application.QueueAsyncCall to destroy the tab in the main application
+  // thread.
+  SendFormMessage(CEF_DESTROYTAB, PtrInt(TabID));
+end;
+
+procedure TBrowserTab.BrowserFrame_OnBrowserTitleChange(Sender: TObject; const aTitle : string);
+begin
+  Caption := aTitle;
+end;
+
+end.