CEF4Delphi/demos/Delphi_FMX/FMXToolBoxBrowser/uFMXApplicationService.pas

// ************************************************************************
// ***************************** 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 © 2019 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 uFMXApplicationService;

{$I cef.inc}

// This unit is based in the TFMXApplicationService class created by Takashi Yamamoto
// https://www.gesource.jp/weblog/?p=7367

interface

uses
  FMX.Platform;

type
  TFMXApplicationService = class(TInterfacedObject, IFMXApplicationService)
    protected
      class var OldFMXApplicationService: IFMXApplicationService;
      class var NewFMXApplicationService: IFMXApplicationService;

    public
      procedure Run;
      function  HandleMessage: Boolean;
      procedure WaitMessage;
      function  GetDefaultTitle: string;
      function  GetTitle: string;
      procedure SetTitle(const Value: string);
      function  GetVersionString: string;
      procedure Terminate;
      function  Terminating: Boolean;
      function  Running: Boolean;

      class procedure AddPlatformService;

      property  DefaultTitle  : string read GetDefaultTitle;
      property  Title         : string read GetTitle          write SetTitle;
      property  AppVersion    : string read GetVersionString;
  end;

implementation

uses
  FMX.Forms,
  uMainForm,
  uChildForm,
  uCEFApplication,
  {$IFDEF MSWINDOWS}
  Winapi.Messages, Winapi.Windows,
  {$ENDIF}
  uCEFConstants;

class procedure TFMXApplicationService.AddPlatformService;
begin
  if TPlatformServices.Current.SupportsPlatformService(IFMXApplicationService, IInterface(OldFMXApplicationService)) then
    begin
      TPlatformServices.Current.RemovePlatformService(IFMXApplicationService);

      NewFMXApplicationService := TFMXApplicationService.Create;
      TPlatformServices.Current.AddPlatformService(IFMXApplicationService, NewFMXApplicationService);
    end;
end;

function TFMXApplicationService.GetDefaultTitle: string;
begin
  Result := OldFMXApplicationService.GetDefaultTitle;
end;

function TFMXApplicationService.GetTitle: string;
begin
  Result := OldFMXApplicationService.GetTitle;
end;

function TFMXApplicationService.GetVersionString: string;
begin
  {$IFDEF DELPHI22_UP}
  Result := OldFMXApplicationService.GetVersionString;
  {$ELSE DELPHI22_UP}
  Result := 'unsupported yet';
  {$ENDIF DELPHI22_UP}
end;

procedure TFMXApplicationService.Run;
begin
  OldFMXApplicationService.Run;
end;

procedure TFMXApplicationService.SetTitle(const Value: string);
begin
  OldFMXApplicationService.SetTitle(Value);
end;

procedure TFMXApplicationService.Terminate;
begin
  OldFMXApplicationService.Terminate;
end;

function TFMXApplicationService.Terminating: Boolean;
begin
  Result := OldFMXApplicationService.Terminating;
end;

procedure TFMXApplicationService.WaitMessage;
begin
  OldFMXApplicationService.WaitMessage;
end;

function TFMXApplicationService.Running: Boolean;
begin
  {$IFDEF DELPHI24_UP}
  Result := OldFMXApplicationService.Running;
  {$ELSE}
  Result := True;
  {$ENDIF}
end;

function TFMXApplicationService.HandleMessage: Boolean;
{$IFDEF MSWINDOWS}
var
  i : integer;
  TempMsg : TMsg;
{$ENDIF}
begin
  {$IFDEF MSWINDOWS}
  if PeekMessage(TempMsg, 0, 0, 0, PM_NOREMOVE) then
    case TempMsg.Message of
      WM_ENTERMENULOOP :
        if not(Application.Terminated) and
           (TempMsg.wParam = 0) and
           (GlobalCEFApp <> nil) then
          GlobalCEFApp.OsmodalLoop := True;

      WM_EXITMENULOOP :
        if not(Application.Terminated) and
           (TempMsg.wParam = 0) and
           (GlobalCEFApp <> nil) then
          GlobalCEFApp.OsmodalLoop := False;

      CEF_INITIALIZED :
        if not(Application.Terminated) and
           (Application.MainForm <> nil) and
           (Application.MainForm is TMainForm) then
          TMainForm(Application.MainForm).DoCEFInitialized;

      CEF_CHILDDESTROYED :
        if not(Application.Terminated) and
           (Application.MainForm <> nil) and
           (Application.MainForm is TMainForm) then
          TMainForm(Application.MainForm).DoChildDestroyed;

      CEF_DESTROY :
        if not(Application.Terminated) then
          begin
            i := 0;

            while (i < screen.FormCount) do
              if (screen.Forms[i] is TChildForm) and
                 (TChildForm(screen.Forms[i]).BrowserID = TempMsg.lParam) then
                begin
                  TChildForm(screen.Forms[i]).DoDestroyParent;
                  i := screen.FormCount;
                end
               else
                inc(i);
          end;
    end;
  {$ENDIF}

  Result := OldFMXApplicationService.HandleMessage;
end;

end.