Class TCEFWorkScheduler

Description
Hierarchy
Fields
Methods
Properties

Unit

uCEFWorkScheduler

Declaration

type TCEFWorkScheduler = class(TComponent)

Description

Implementation of an external message pump for VCL and LCL.

Read the GlobalCEFApp.OnScheduleMessagePumpWork documentation for all the details.

Hierarchy

Overview

Fields

Protected FThread: TCEFWorkSchedulerThread;
Protected FQueueThread: TCEFWorkSchedulerQueueThread;
Protected FDepleteWorkCycles: cardinal;
Protected FDepleteWorkDelay: cardinal;
Protected FDefaultInterval: integer;
Protected FStopped: boolean;
Protected FUseQueueThread: boolean;
Protected FCompHandle: HWND;
Protected FPriority: TThreadPriority;

Methods

Protected procedure CreateQueueThread;
Protected procedure DestroyQueueThread;
Protected procedure QueueThread_OnPulse(Sender : TObject; aDelay : integer);
Protected procedure DestroyThread;
Protected procedure DepleteWork;
Protected procedure WndProc(var aMessage: TMessage);
Protected procedure DeallocateWindowHandle;
Protected procedure NextPulse(aInterval : integer);
Protected procedure ScheduleWork(const delay_ms : int64);
Protected procedure DoWork;
Protected procedure DoMessageLoopWork;
Protected procedure Initialize;
Protected procedure SetDefaultInterval(aValue : integer);
Protected procedure SetPriority(aValue : TThreadPriority);
Protected procedure Thread_OnPulse(Sender : TObject);
Public constructor Create(AOwner: TComponent); override;
Public constructor CreateDelayed;
Public destructor Destroy; override;
Public procedure ScheduleMessagePumpWork(const delay_ms : int64);
Public procedure StopScheduler;
Public procedure CreateThread;

Properties

Published property Priority : TThreadPriority read FPriority write SetPriority default tpNormal;
Published property DefaultInterval : integer read FDefaultInterval write SetDefaultInterval default CEF_TIMER_MAXDELAY;
Published property DepleteWorkCycles : cardinal read FDepleteWorkCycles write FDepleteWorkCycles default CEF_TIMER_DEPLETEWORK_CYCLES;
Published property DepleteWorkDelay : cardinal read FDepleteWorkDelay write FDepleteWorkDelay default CEF_TIMER_DEPLETEWORK_DELAY;
Published property UseQueueThread : boolean read FUseQueueThread write FUseQueueThread default False;

Description

Fields

Protected FThread: TCEFWorkSchedulerThread;

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Protected FQueueThread: TCEFWorkSchedulerQueueThread;

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Protected FDepleteWorkCycles: cardinal;

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Protected FDepleteWorkDelay: cardinal;

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Protected FDefaultInterval: integer;

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Protected FStopped: boolean;

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Protected FUseQueueThread: boolean;

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Protected FCompHandle: HWND;

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Protected FPriority: TThreadPriority;

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Methods

Protected procedure CreateQueueThread;

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Protected procedure DestroyQueueThread;

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Protected procedure QueueThread_OnPulse(Sender : TObject; aDelay : integer);

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Protected procedure DestroyThread;

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Protected procedure DepleteWork;

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Protected procedure WndProc(var aMessage: TMessage);

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Protected procedure DeallocateWindowHandle;

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Protected procedure NextPulse(aInterval : integer);

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Protected procedure ScheduleWork(const delay_ms : int64);

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Protected procedure DoWork;

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Protected procedure DoMessageLoopWork;

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Protected procedure Initialize;

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Protected procedure SetDefaultInterval(aValue : integer);

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Protected procedure SetPriority(aValue : TThreadPriority);

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Protected procedure Thread_OnPulse(Sender : TObject);

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Public constructor Create(AOwner: TComponent); override;

Full constructor of TCEFWorkScheduler. This constructor also creates the internal threads.

Public constructor CreateDelayed;

Partial constructor of TCEFWorkScheduler. This constructor doesn't create any threads. Call TCEFWorkScheduler.CreateThread when necessary.

Public destructor Destroy; override;

TCEFWorkScheduler destructor.

Public procedure ScheduleMessagePumpWork(const delay_ms : int64);

Called from GlobalCEFApp.OnScheduleMessagePumpWork to schedule a GlobalCEFApp.DoMessageLoopWork call asynchronously to perform a single iteration of CEF message loop processing.

Parameters
delay_ms
Requested delay in milliseconds.
Public procedure StopScheduler;

Stop the scheduler. This function must be called after the destruction of all the forms in the application.

Public procedure CreateThread;

Creates all the internal threads used by TCEFWorkScheduler.

Properties

Published property Priority : TThreadPriority read FPriority write SetPriority default tpNormal;

Priority of TCEFWorkSchedulerThread in Windows.

Published property DefaultInterval : integer read FDefaultInterval write SetDefaultInterval default CEF_TIMER_MAXDELAY;

Default interval in milliseconds to do the next GlobalCEFApp.DoMessageLoopWork call.

Published property DepleteWorkCycles : cardinal read FDepleteWorkCycles write FDepleteWorkCycles default CEF_TIMER_DEPLETEWORK_CYCLES;

Number of cycles used to deplete the remaining messages in the work loop.

Published property DepleteWorkDelay : cardinal read FDepleteWorkDelay write FDepleteWorkDelay default CEF_TIMER_DEPLETEWORK_DELAY;

Delay in milliseconds between the cycles used to deplete the remaining messages in the work loop.

Published property UseQueueThread : boolean read FUseQueueThread write FUseQueueThread default False;

Use a custom queue thread instead of Windows messages or any other way to schedule the next pump work.

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