ReduxDelphi

ReduxDelphi

ReduxDelphi是使用單向數據流的Delphi應用程序的可預測狀態容器。受https://github.com/reaectjs/redux的啟發。

該項目目前是通過Delphi 10.1開發的

TODOMVC樣本基於不變的數據結構（通用不可變的列表）。

反樣品代碼

這是一個簡單的示例，顯示了商店，操作，調度等的基本用法，...：

 unit DemoCounterForm;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes,
  Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls,
  Redux;

type
  TEnumAction= (INIT, INCREMENT, DECREMENT);

  TFormDemoCounter = class (TForm)
    ButtonInc: TButton;
    ButtonDec: TButton;
    LabelCounter: TLabel;

    procedure ButtonIncClick (Sender: TObject);
    procedure ButtonDecClick (Sender: TObject);
    procedure FormShow (Sender: TObject);

  private
    FStore : IStore<Integer, TEnumAction>;
  end ;

var
  FormDemoCounter: TFormDemoCounter;

implementation

{ $R *.dfm }

procedure TFormDemoCounter.ButtonIncClick (Sender: TObject);
begin
  FStore.dispatch(INCREMENT);
end ;

procedure TFormDemoCounter.ButtonDecClick (Sender: TObject);
begin
  FStore.dispatch(DECREMENT);
end ;

procedure TFormDemoCounter.FormShow (Sender: TObject);
var
  FReducer : TReducer<Integer,TEnumAction>;
begin
  FReducer :=
    function(State: Integer; Action: TEnumAction): Integer
    begin
      case Action of
        INCREMENT:
          Result := State + 1 ;
        DECREMENT:
          Result := State - 1 ;
        else
          Result := State;
      end ;
    end ;

  FStore := TStore<Integer, TEnumAction>.Create(FReducer, 0 );
  FStore.subscribe( procedure (State: Integer)
    begin
      LabelCounter.Caption := IntToStr(State);
    end
  );
  FStore.dispatch(INIT);
end ;

end .