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mirror of https://github.com/salvadordf/CEF4Delphi.git synced 2024-12-04 09:26:52 +02:00
CEF4Delphi/source/uCEFWorkScheduler.pas

284 lines
7.6 KiB
ObjectPascal

// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF3 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 © 2018 Salvador Díaz 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 uCEFWorkScheduler;
{$IFNDEF CPUX64}
{$ALIGN ON}
{$MINENUMSIZE 4}
{$ENDIF}
{$I cef.inc}
interface
uses
{$IFDEF DELPHI16_UP}
{$IFDEF MSWINDOWS}WinApi.Windows, WinApi.Messages, Vcl.Controls, Vcl.Graphics, Vcl.Forms,{$ENDIF} System.Classes,
{$ELSE}
Windows, Messages, Classes, Controls, Graphics, Forms,
{$ENDIF}
uCEFConstants, uCEFWorkSchedulerThread;
type
TCEFWorkScheduler = class(TComponent)
protected
FCompHandle : HWND;
FThread : TCEFWorkSchedulerThread;
FDepleteWorkCycles : cardinal;
FDepleteWorkDelay : cardinal;
FDefaultInterval : integer;
FStopped : boolean;
{$IFDEF MSWINDOWS}
{$WARN SYMBOL_PLATFORM OFF}
FPriority : TThreadPriority;
{$WARN SYMBOL_PLATFORM ON}
{$ENDIF}
procedure CreateThread;
procedure DestroyThread;
procedure DeallocateWindowHandle;
procedure DepleteWork;
procedure WndProc(var aMessage: TMessage);
procedure NextPulse(aInterval : integer);
procedure ScheduleWork(const delay_ms : int64);
procedure DoWork;
procedure DoMessageLoopWork;
procedure SetDefaultInterval(aValue : integer);
{$IFDEF MSWINDOWS}
{$WARN SYMBOL_PLATFORM OFF}
procedure SetPriority(aValue : TThreadPriority);
{$WARN SYMBOL_PLATFORM ON}
{$ENDIF}
procedure Thread_OnPulse(Sender : TObject);
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure AfterConstruction; override;
procedure ScheduleMessagePumpWork(const delay_ms : int64);
procedure StopScheduler;
published
{$IFDEF MSWINDOWS}
{$WARN SYMBOL_PLATFORM OFF}
property Priority : TThreadPriority read FPriority write SetPriority default tpNormal;
{$WARN SYMBOL_PLATFORM ON}
{$ENDIF}
property DefaultInterval : integer read FDefaultInterval write SetDefaultInterval default CEF_TIMER_MAXDELAY;
property DepleteWorkCycles : cardinal read FDepleteWorkCycles write FDepleteWorkCycles default CEF_TIMER_DEPLETEWORK_CYCLES;
property DepleteWorkDelay : cardinal read FDepleteWorkDelay write FDepleteWorkDelay default CEF_TIMER_DEPLETEWORK_DELAY;
end;
var
GlobalCEFWorkScheduler : TCEFWorkScheduler = nil;
implementation
uses
{$IFDEF DELPHI16_UP}
System.SysUtils, System.Math,
{$ELSE}
SysUtils, Math,
{$ENDIF}
uCEFMiscFunctions, uCEFApplication;
constructor TCEFWorkScheduler.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FThread := nil;
FCompHandle := 0;
FStopped := False;
{$IFDEF MSWINDOWS}
{$WARN SYMBOL_PLATFORM OFF}
FPriority := tpNormal;
{$WARN SYMBOL_PLATFORM ON}
{$ENDIF}
FDefaultInterval := CEF_TIMER_MAXDELAY;
FDepleteWorkCycles := CEF_TIMER_DEPLETEWORK_CYCLES;
FDepleteWorkDelay := CEF_TIMER_DEPLETEWORK_DELAY;
end;
destructor TCEFWorkScheduler.Destroy;
begin
DestroyThread;
DeallocateWindowHandle;
inherited Destroy;
end;
procedure TCEFWorkScheduler.AfterConstruction;
begin
inherited AfterConstruction;
if not(csDesigning in ComponentState) then
begin
FCompHandle := AllocateHWnd(WndProc);
CreateThread;
end;
end;
procedure TCEFWorkScheduler.CreateThread;
begin
FThread := TCEFWorkSchedulerThread.Create;
{$IFDEF MSWINDOWS}
FThread.Priority := FPriority;
{$ENDIF}
FThread.DefaultInterval := FDefaultInterval;
FThread.OnPulse := Thread_OnPulse;
{$IFDEF DELPHI14_UP}
FThread.Start;
{$ELSE}
FThread.Resume;
{$ENDIF}
end;
procedure TCEFWorkScheduler.DestroyThread;
begin
try
if (FThread <> nil) then
begin
FThread.Terminate;
FThread.NextPulse(0);
FThread.WaitFor;
FreeAndNil(FThread);
end;
except
on e : exception do
if CustomExceptionHandler('TCEFWorkScheduler.DestroyThread', e) then raise;
end;
end;
procedure TCEFWorkScheduler.WndProc(var aMessage: TMessage);
begin
if (aMessage.Msg = CEF_PUMPHAVEWORK) then
ScheduleWork(aMessage.lParam)
else
aMessage.Result := DefWindowProc(FCompHandle, aMessage.Msg, aMessage.WParam, aMessage.LParam);
end;
procedure TCEFWorkScheduler.DeallocateWindowHandle;
begin
if (FCompHandle <> 0) then
begin
DeallocateHWnd(FCompHandle);
FCompHandle := 0;
end;
end;
procedure TCEFWorkScheduler.DoMessageLoopWork;
begin
if (GlobalCEFApp <> nil) then GlobalCEFApp.DoMessageLoopWork;
end;
procedure TCEFWorkScheduler.SetDefaultInterval(aValue : integer);
begin
FDefaultInterval := aValue;
if (FThread <> nil) then FThread.DefaultInterval := aValue;
end;
{$IFDEF MSWINDOWS}
{$WARN SYMBOL_PLATFORM OFF}
procedure TCEFWorkScheduler.SetPriority(aValue : TThreadPriority);
begin
FPriority := aValue;
if (FThread <> nil) then FThread.Priority := aValue;
end;
{$WARN SYMBOL_PLATFORM ON}
{$ENDIF}
procedure TCEFWorkScheduler.DepleteWork;
var
i : cardinal;
begin
i := FDepleteWorkCycles;
while (i > 0) do
begin
DoMessageLoopWork;
Sleep(FDepleteWorkDelay);
dec(i);
end;
end;
procedure TCEFWorkScheduler.ScheduleMessagePumpWork(const delay_ms : int64);
begin
if not(FStopped) and (FCompHandle <> 0) then
PostMessage(FCompHandle, CEF_PUMPHAVEWORK, 0, LPARAM(delay_ms));
end;
procedure TCEFWorkScheduler.StopScheduler;
begin
FStopped := True;
NextPulse(0);
DepleteWork;
DeallocateWindowHandle;
end;
procedure TCEFWorkScheduler.Thread_OnPulse(Sender: TObject);
begin
if not(FStopped) then DoMessageLoopWork;
end;
procedure TCEFWorkScheduler.DoWork;
begin
DoMessageLoopWork;
NextPulse(FDefaultInterval);
end;
procedure TCEFWorkScheduler.ScheduleWork(const delay_ms : int64);
begin
if not(FStopped) then
begin
if (delay_ms <= 0) then
DoWork
else
NextPulse(delay_ms);
end;
end;
procedure TCEFWorkScheduler.NextPulse(aInterval : integer);
begin
if (FThread <> nil) then FThread.NextPulse(aInterval);
end;
end.