mirror of
https://github.com/salvadordf/CEF4Delphi.git
synced 2024-11-15 15:55:56 +01:00
442 lines
11 KiB
ObjectPascal
442 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 © 2022 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 uCEFTimerWorkScheduler;
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{$IFDEF FPC}
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{$MODE OBJFPC}{$H+}
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{$ENDIF}
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{$I cef.inc}
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{.$DEFINE USEEVENTPIPE}
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{$IFNDEF TARGET_64BITS}{$ALIGN ON}{$ENDIF}
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{$MINENUMSIZE 4}
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interface
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uses
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{$IFDEF DELPHI16_UP}
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System.Classes, System.SyncObjs, {$IFDEF MSWINDOWS}WinApi.Windows, WinApi.Messages,{$ENDIF}
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{$IFDEF FMX}
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FMX.Types, uCEFMacOSCustomCocoaTimer,
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{$ELSE}
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Vcl.ExtCtrls,
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{$ENDIF}
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{$ELSE}
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Classes, SyncObjs, {$IFDEF MSWINDOWS}Windows,{$ENDIF} ExtCtrls,
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{$IFDEF FPC}
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LMessages, Forms,
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{$ELSE}
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Messages,
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{$ENDIF}
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{$ENDIF}
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{$IFDEF USEEVENTPIPE}uCEFLinuxEventPipe,{$ENDIF} uCEFTypes, uCEFConstants,
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uCEFApplicationCore;
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type
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TOnAllowEvent = procedure(Sender: TObject; var allow : boolean) of object;
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TCEFTimerWorkScheduler = class
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protected
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FTimer : {$IFDEF MACOS}TCustomCocoaTimer{$ELSE}TTimer{$ENDIF};
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FDepleteWorkCycles : cardinal;
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FDepleteWorkDelay : cardinal;
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FStopped : boolean;
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FIsActive : boolean;
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FReentrancyDetected : boolean;
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FOnAllowDoWork : TOnAllowEvent;
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{$IFDEF USEEVENTPIPE}
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FEventPipe : TCEFLinuxEventPipe;
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FDelayedWorkTime : TCefTime;
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{$ENDIF}
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{$IFDEF MSWINDOWS}
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FCompHandle : HWND;
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{$ENDIF}
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function GetIsTimerPending : boolean;
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procedure Timer_OnTimer(Sender: TObject);
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{$IFDEF USEEVENTPIPE}
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procedure FEventPipe_OnPrepare(Sender: TObject; var aTimeout: integer);
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procedure FEventPipe_OnCheck(Sender: TObject; var aMustDispatch: boolean);
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procedure FEventPipe_OnDispatch(Sender: TObject);
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{$ENDIF}
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procedure Initialize;
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procedure CreateTimer;
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procedure DestroyTimer;
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procedure KillTimer;
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procedure SetTimer(aInterval : integer);
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procedure DoWork;
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function PerformMessageLoopWork : boolean;
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procedure DoMessageLoopWork;
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procedure OnScheduleWork(delay_ms : integer);
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procedure DepleteWork;
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{$IFDEF MSWINDOWS}
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procedure WndProc(var aMessage: TMessage);
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procedure AllocateWindowHandle;
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procedure DeallocateWindowHandle;
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{$ELSE}
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{$IFDEF FPC}
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procedure OnScheduleWorkAsync(Data: PtrInt);
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{$ENDIF}
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{$ENDIF}
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public
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constructor Create;
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destructor Destroy; override;
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procedure StopScheduler;
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procedure ScheduleMessagePumpWork(const delay_ms : int64);
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property DepleteWorkCycles : cardinal read FDepleteWorkCycles write FDepleteWorkCycles;
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property DepleteWorkDelay : cardinal read FDepleteWorkDelay write FDepleteWorkDelay;
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property IsTimerPending : boolean read GetIsTimerPending;
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property OnAllowDoWork : TOnAllowEvent read FOnAllowDoWork write FOnAllowDoWork;
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end;
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var
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GlobalCEFTimerWorkScheduler : TCEFTimerWorkScheduler = nil;
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procedure DestroyGlobalCEFTimerWorkScheduler;
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implementation
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uses
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{$IFDEF DELPHI16_UP}
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System.SysUtils, System.Math, {$IFDEF MACOS}System.RTTI, FMX.Forms, FMX.Platform,{$ENDIF}
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{$ELSE}
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SysUtils, Math,
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{$ENDIF}
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uCEFMiscFunctions;
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procedure DestroyGlobalCEFTimerWorkScheduler;
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begin
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if (GlobalCEFTimerWorkScheduler <> nil) then
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FreeAndNil(GlobalCEFTimerWorkScheduler);
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end;
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constructor TCEFTimerWorkScheduler.Create;
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begin
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inherited Create;
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Initialize;
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{$IFDEF MSWINDOWS}
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AllocateWindowHandle;
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{$ENDIF}
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{$IFDEF USEEVENTPIPE}
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FEventPipe := TCEFLinuxEventPipe.Create;
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FEventPipe.OnPrepare := {$IFDEF FPC}@{$ENDIF}FEventPipe_OnPrepare;
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FEventPipe.OnCheck := {$IFDEF FPC}@{$ENDIF}FEventPipe_OnCheck;
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FEventPipe.OnDispatch := {$IFDEF FPC}@{$ENDIF}FEventPipe_OnDispatch;
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FEventPipe.InitializePipe;
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{$ENDIF}
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end;
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destructor TCEFTimerWorkScheduler.Destroy;
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begin
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DestroyTimer;
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{$IFDEF MSWINDOWS}
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DeallocateWindowHandle;
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{$ENDIF}
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{$IFDEF USEEVENTPIPE}
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if assigned(FEventPipe) then
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FreeAndNil(FEventPipe);
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{$ENDIF}
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inherited Destroy;
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end;
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procedure TCEFTimerWorkScheduler.Initialize;
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begin
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{$IFDEF MSWINDOWS}
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FCompHandle := 0;
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{$ENDIF}
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{$IFDEF USEEVENTPIPE}
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FEventPipe := nil;
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InitializeCefTime(FDelayedWorkTime);
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{$ENDIF}
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FOnAllowDoWork := nil;
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FTimer := nil;
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FStopped := False;
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FIsActive := False;
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FReentrancyDetected := False;
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FDepleteWorkCycles := CEF_TIMER_DEPLETEWORK_CYCLES;
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FDepleteWorkDelay := CEF_TIMER_DEPLETEWORK_DELAY;
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end;
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{$IFDEF MSWINDOWS}
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procedure TCEFTimerWorkScheduler.WndProc(var aMessage: TMessage);
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begin
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if (aMessage.Msg = CEF_PUMPHAVEWORK) then
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OnScheduleWork(aMessage.lParam)
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else
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aMessage.Result := DefWindowProc(FCompHandle, aMessage.Msg, aMessage.WParam, aMessage.LParam);
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end;
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procedure TCEFTimerWorkScheduler.AllocateWindowHandle;
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begin
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if (FCompHandle = 0) and (GlobalCEFApp <> nil) and
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((GlobalCEFApp.ProcessType = ptBrowser) or GlobalCEFApp.SingleProcess) then
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FCompHandle := AllocateHWnd({$IFDEF FPC}@{$ENDIF}WndProc);
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end;
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procedure TCEFTimerWorkScheduler.DeallocateWindowHandle;
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begin
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if (FCompHandle <> 0) then
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begin
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DeallocateHWnd(FCompHandle);
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FCompHandle := 0;
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end;
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end;
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{$ENDIF}
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{$IFDEF USEEVENTPIPE}
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procedure TCEFTimerWorkScheduler.FEventPipe_OnPrepare(Sender: TObject; var aTimeout: integer);
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begin
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aTimeout := GetTimeIntervalMilliseconds(FDelayedWorkTime);
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end;
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procedure TCEFTimerWorkScheduler.FEventPipe_OnCheck(Sender: TObject; var aMustDispatch: boolean);
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var
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TempValue : integer;
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begin
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if FEventPipe.HasData or FEventPipe.HasPendingData then
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begin
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TempValue := 0;
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FEventPipe.Read(TempValue);
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OnScheduleWork(TempValue);
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end;
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aMustDispatch := GetTimeIntervalMilliseconds(FDelayedWorkTime) = 0;
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end;
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procedure TCEFTimerWorkScheduler.FEventPipe_OnDispatch(Sender: TObject);
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begin
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KillTimer;
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DoWork;
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end;
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{$ENDIF}
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procedure TCEFTimerWorkScheduler.StopScheduler;
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begin
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FStopped := True;
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KillTimer;
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DepleteWork;
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end;
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procedure TCEFTimerWorkScheduler.DepleteWork;
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var
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i : cardinal;
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begin
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i := FDepleteWorkCycles;
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while (i > 0) do
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begin
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DoMessageLoopWork;
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Sleep(FDepleteWorkDelay);
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dec(i);
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end;
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end;
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{$IFNDEF MSWINDOWS}{$IFDEF FPC}
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procedure TCEFTimerWorkScheduler.OnScheduleWorkAsync(Data: PtrInt);
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begin
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OnScheduleWork(integer(Data));
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end;
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{$ENDIF}{$ENDIF}
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procedure TCEFTimerWorkScheduler.CreateTimer;
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begin
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if (FTimer = nil) then
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begin
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{$IFDEF MACOS}
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FTimer := TCustomCocoaTimer.Create;
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{$ELSE}
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FTimer := TTimer.Create(nil);
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{$ENDIF}
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FTimer.OnTimer := {$IFDEF FPC}@{$ENDIF}Timer_OnTimer;
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FTimer.Enabled := False;
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end;
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end;
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procedure TCEFTimerWorkScheduler.DestroyTimer;
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begin
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if (FTimer <> nil) then
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FreeAndNil(FTimer);
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end;
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procedure TCEFTimerWorkScheduler.KillTimer;
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begin
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{$IFDEF USEEVENTPIPE}
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InitializeCefTime(FDelayedWorkTime);
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{$ELSE}
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if (FTimer <> nil) then
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FTimer.Enabled := False;
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{$ENDIF}
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end;
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procedure TCEFTimerWorkScheduler.SetTimer(aInterval : integer);
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begin
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{$IFDEF USEEVENTPIPE}
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FDelayedWorkTime := DoubleToCefTime((DoubleTimeNow + aInterval) / 1000);
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{$ELSE}
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if (FTimer = nil) then
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CreateTimer;
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FTimer.Interval := aInterval;
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FTimer.Enabled := True;
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{$ENDIF}
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end;
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function TCEFTimerWorkScheduler.GetIsTimerPending : boolean;
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begin
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{$IFDEF USEEVENTPIPE}
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Result := GetTimeIntervalMilliseconds(FDelayedWorkTime) > 0;
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{$ELSE}
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Result := (FTimer <> nil) and FTimer.Enabled;
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{$ENDIF}
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end;
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procedure TCEFTimerWorkScheduler.OnScheduleWork(delay_ms : integer);
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begin
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if FStopped or
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((delay_ms = high(integer)) and IsTimerPending) then
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exit;
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KillTimer;
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if (delay_ms <= 0) then
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DoWork
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else
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SetTimer(min(delay_ms, CEF_TIMER_MAXDELAY));
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end;
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procedure TCEFTimerWorkScheduler.Timer_OnTimer(Sender: TObject);
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begin
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KillTimer;
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DoWork;
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end;
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procedure TCEFTimerWorkScheduler.DoWork;
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begin
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if PerformMessageLoopWork then
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ScheduleMessagePumpWork(0)
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else
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if not(IsTimerPending) then
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ScheduleMessagePumpWork(high(integer));
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end;
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function TCEFTimerWorkScheduler.PerformMessageLoopWork : boolean;
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begin
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Result := False;
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if FIsActive then
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begin
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FReentrancyDetected := True;
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exit;
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end;
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FReentrancyDetected := False;
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DoMessageLoopWork;
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Result := FReentrancyDetected;
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end;
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procedure TCEFTimerWorkScheduler.DoMessageLoopWork;
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var
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TempAllow : boolean;
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begin
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TempAllow := True;
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if assigned(FOnAllowDoWork) then
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FOnAllowDoWork(self, TempAllow);
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if TempAllow and (GlobalCEFApp <> nil) then
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try
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FIsActive := True;
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GlobalCEFApp.DoMessageLoopWork;
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finally
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FIsActive := False;
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end;
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end;
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procedure TCEFTimerWorkScheduler.ScheduleMessagePumpWork(const delay_ms : int64);
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begin
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if FStopped then exit;
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{$IFDEF MSWINDOWS}
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if (FCompHandle <> 0) then
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PostMessage(FCompHandle, CEF_PUMPHAVEWORK, 0, LPARAM(delay_ms));
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{$ENDIF}
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{$IFDEF LINUX}
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{$IFDEF FPC}
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{$IFDEF USEEVENTPIPE}
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if assigned(FEventPipe) then
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FEventPipe.Write(integer(delay_ms));
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{$ELSE}
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Application.QueueAsyncCall(@OnScheduleWorkAsync, integer(delay_ms));
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{$ENDIF}
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{$ELSE}
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TThread.ForceQueue(nil, procedure
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begin
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OnScheduleWork(integer(delay_ms));
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end);
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{$ENDIF}
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{$ENDIF}
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{$IFDEF MACOS}
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{$IFDEF FPC}
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Application.QueueAsyncCall(@OnScheduleWorkAsync, integer(delay_ms));
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{$ELSE}
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TThread.ForceQueue(nil, procedure
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begin
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OnScheduleWork(integer(delay_ms));
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end);
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{$ENDIF}
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{$ENDIF}
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end;
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end.
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