mirror of
https://github.com/salvadordf/CEF4Delphi.git
synced 2024-12-14 09:42:54 +02:00
002a21e6d6
- Added TCEFWorkSchedulerQueueThread as an experimental way to handle the external message pump events for all platforms. - Fixed backwards compatibility issues with Delphi 7.
273 lines
6.5 KiB
ObjectPascal
273 lines
6.5 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 © 2021 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 uCEFWorkSchedulerQueueThread;
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{$IFDEF FPC}
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{$MODE OBJFPC}{$H+}
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{$ENDIF}
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{$IFNDEF CPUX64}{$ALIGN ON}{$ENDIF}
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{$MINENUMSIZE 4}
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{$I cef.inc}
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interface
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uses
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{$IFDEF DELPHI16_UP}
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System.Classes, System.SyncObjs, System.SysUtils,
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{$ELSE}
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Classes, SyncObjs, SysUtils,
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{$ENDIF}
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uCEFConstants;
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type
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TOnPulseEvent = procedure(Sender: TObject; aDelay: integer) of object;
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TValuesArray = array of integer;
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TCEFWorkSchedulerQueueThread = class(TThread)
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protected
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FQueueCS : TCriticalSection;
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FEvent : TEvent;
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FWaiting : boolean;
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FStop : boolean;
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FReady : boolean;
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FValues : TValuesArray;
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FOnPulse : TOnPulseEvent;
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function GetAvailableValue : integer;
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function GetHasPendingValue : boolean;
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function Lock : boolean;
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procedure Unlock;
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function CanContinue : boolean;
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procedure ReadAllPendingValues;
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procedure DoOnPulse;
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procedure Execute; override;
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property AvailableValue : integer read GetAvailableValue;
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property HasPendingValue : boolean read GetHasPendingValue;
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public
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constructor Create;
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destructor Destroy; override;
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procedure AfterConstruction; override;
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procedure StopThread;
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procedure EnqueueValue(aValue : integer);
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property Ready : boolean read FReady;
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property OnPulse : TOnPulseEvent read FOnPulse write FOnPulse;
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end;
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implementation
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constructor TCEFWorkSchedulerQueueThread.Create;
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begin
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inherited Create(True);
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FReady := False;
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FQueueCS := nil;
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FWaiting := False;
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FStop := False;
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FEvent := nil;
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FValues := nil;
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FOnPulse := nil;
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FreeOnTerminate := False;
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end;
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destructor TCEFWorkSchedulerQueueThread.Destroy;
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begin
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if (FEvent <> nil) then FreeAndNil(FEvent);
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if (FQueueCS <> nil) then FreeAndNil(FQueueCS);
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if (FValues <> nil) then
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begin
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Finalize(FValues);
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FValues := nil;
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end;
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inherited Destroy;
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end;
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procedure TCEFWorkSchedulerQueueThread.AfterConstruction;
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begin
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inherited AfterConstruction;
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FEvent := TEvent.Create(nil, False, False, '');
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FQueueCS := TCriticalSection.Create;
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end;
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function TCEFWorkSchedulerQueueThread.Lock : boolean;
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begin
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if (FQueueCS <> nil) then
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begin
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FQueueCS.Acquire;
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Result := True;
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end
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else
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Result := False;
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end;
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procedure TCEFWorkSchedulerQueueThread.Unlock;
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begin
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if (FQueueCS <> nil) then FQueueCS.Release;
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end;
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function TCEFWorkSchedulerQueueThread.GetAvailableValue : integer;
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var
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TempLen : integer;
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TempNewValues : TValuesArray;
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begin
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Result := 0;
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if Lock then
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begin
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TempLen := length(FValues);
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if (TempLen > 0) then
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begin
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Result := FValues[0];
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if (TempLen = 1) then
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SetLength(FValues, 0)
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else
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begin
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SetLength(TempNewValues, TempLen - 1);
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TempNewValues := copy(FValues, 1, high(integer));
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SetLength(FValues, length(TempNewValues));
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FValues := Copy(TempNewValues);
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Finalize(TempNewValues);
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end;
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end;
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Unlock;
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end;
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end;
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function TCEFWorkSchedulerQueueThread.GetHasPendingValue : boolean;
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begin
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Result := False;
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if Lock then
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begin
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if not(Terminated) and not(FStop) then
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begin
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FWaiting := False;
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Result := (Length(FValues) > 0);
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end;
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Unlock;
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end;
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end;
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procedure TCEFWorkSchedulerQueueThread.StopThread;
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begin
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if Lock then
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begin
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FStop := True;
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if FWaiting then
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begin
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FWaiting := False;
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FEvent.SetEvent;
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end;
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Unlock;
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end;
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end;
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procedure TCEFWorkSchedulerQueueThread.EnqueueValue(aValue : integer);
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begin
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if Lock then
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try
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SetLength(FValues, Length(FValues) + 1);
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FValues[Length(FValues) - 1] := aValue;
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if FWaiting then
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begin
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FWaiting := False;
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FEvent.SetEvent;
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end;
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finally
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Unlock;
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end;
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end;
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procedure TCEFWorkSchedulerQueueThread.ReadAllPendingValues;
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begin
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while HasPendingValue do
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if not(Terminated) then
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Synchronize({$IFDEF FPC}self, @{$ENDIF}DoOnPulse);
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end;
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procedure TCEFWorkSchedulerQueueThread.DoOnPulse;
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begin
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if assigned(FOnPulse) then
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FOnPulse(self, AvailableValue);
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end;
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function TCEFWorkSchedulerQueueThread.CanContinue : boolean;
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begin
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Result := False;
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if Lock then
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try
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if not(Terminated) and not(FStop) then
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begin
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Result := True;
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FWaiting := True;
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FEvent.ResetEvent;
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end;
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finally
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Unlock;
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end;
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end;
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procedure TCEFWorkSchedulerQueueThread.Execute;
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begin
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FReady := True;
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while CanContinue do
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begin
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FEvent.WaitFor(INFINITE);
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ReadAllPendingValues;
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end;
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end;
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end.
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