unit ViewManager;

interface

uses
  SysUtils, InterfaceUI, Classes, Forms;

type
  TViewManager = class(TInterfacedObject, IViewManager)
  private
    FClasses: TList;
    FSingleViews: TStringList;
    FOpenViews: TStringList;

  public
    constructor Create;
    destructor Destroy; override;
    class function Current: TViewManager;
    function GetView(AClassName: string): IUIForm;
    function GetSingleView(AClassName: string): IUIForm;
    function GetIDView(AClassName, AFormID: string): IUIIDForm;
    function FreeIDView(AClassName, AFormID: string): IUIIDForm;
    procedure RegisterClass(AClass: TFormClass);
  end;

implementation

var
  FViewManager: TViewManager;

{ TViewManager }

constructor TViewManager.Create;
begin
  FClasses := TList.Create;
  FSingleViews := TStringList.Create;
  FOpenViews := TStringList.Create;
  inherited;
end;

class function TViewManager.Current: TViewManager;
begin
  if FViewManager = nil then
    FViewManager := TViewManager.Create;
  Result := FViewManager;
end;

destructor TViewManager.Destroy;
begin
  FreeAndNil(FClasses);
  FreeAndNil(FOpenViews);
  FreeAndNil(FSingleViews);
  inherited;
end;

function TViewManager.FreeIDView(AClassName, AFormID: string): IUIIDForm;
var
  i: Integer;
begin
  i := FOpenViews.IndexOf(AClassName + AFormID);
  if i > -1 then
    FOpenViews.Delete(i);
end;

function TViewManager.GetIDView(AClassName, AFormID: string): IUIIDForm;
var
  i: Integer;
  AClass: TFormClass;
  AForm: TForm;
  ColorForm: IChangeUIColor;
begin
  i := FOpenViews.IndexOf(AClassName + AFormID);
  if i < 0 then
  begin
    for i := 0 to FClasses.Count - 1 do
    begin
      if TFormClass(FClasses[i]).ClassName = AClassName then
      begin
        AClass := TFormClass(FClasses[i]);
        AForm := AClass.Create(Application);
        if not AForm.GetInterface(IUIIDForm, Result) then
        begin
          Result := nil;
          Exit;
        end;
        Result.SetAutoFree(True);
        Result.SetFormID(AFormID);
//        if AForm.GetInterface(IChangeUIColor, ColorForm) then
//          ColorForm.ChangeUIColor(MainForm.FormColor);
        FOpenViews.AddObject(AClassName, AForm);
        Break;
      end;
    end;
  end
  else
    FOpenViews.Objects[i].GetInterface(IUIIDForm, Result);
end;

function TViewManager.GetSingleView(AClassName: string): IUIForm;
var
  i: Integer;
  AClass: TFormClass;
  AForm: TForm;
  ColorForm: IChangeUIColor;
begin
  i := FSingleViews.IndexOf(AClassName);
  if i < 0 then
  begin
    for i := 0 to FClasses.Count - 1 do
    begin
      if TCustomFormClass(FClasses[i]).ClassName = AClassName then
      begin
        AClass := TFormClass(FClasses[i]);
        AForm := AClass.Create(Application);
        if not AForm.GetInterface(IUIForm, Result) then
        begin
          Result := nil;
          Exit;
        end;
        Result.SetAutoFree(False);

//        if AForm.GetInterface(IChangeUIColor, ColorForm) then
//          ColorForm.ChangeUIColor(MainForm.FormColor);
        FSingleViews.AddObject(AClassName, AForm);
        Break;
      end;
    end;
  end
  else
    FSingleViews.Objects[i].GetInterface(IUIForm, Result);
end;

function TViewManager.GetView(AClassName: string): IUIForm;
var
  i: Integer;
  AClass: TFormClass;
  AForm: TForm;
//  ColorForm: IChangeUIColor;
begin
  for i := 0 to FClasses.Count - 1 do
  begin
    if TCustomFormClass(FClasses[i]).ClassName = AClassName then
    begin
      AClass := TFormClass(FClasses[i]);
      AForm := AClass.Create(Application);
//      if AForm.GetInterface(IChangeUIColor, ColorForm) then
//        ColorForm.ChangeUIColor(MainForm.FormColor);
      if not AForm.GetInterface(IUIForm, Result) then
      begin
        Result := nil;
        AForm.Free;
      end;
//      else
//      begin
//        Result.SetAutoFree(True);
//        FOpenViews.AddObject(IntToStr(AForm.Handle), AForm);
//      end;
//      Break;
    end;
  end;
end;

procedure TViewManager.RegisterClass(AClass: TFormClass);
var
  i: Integer;
begin    
  i := FClasses.IndexOf(AClass);
  if i < 0 then
    FClasses.Add(AClass);
end;


initialization


finalization
//  if FViewManager <> nil then
//    FreeAndNil(FViewManager);


    

end.