====== Razvoj Controla ======

Workflow za kreiranje novih UI-Controla za WvdS FPC RAD Suite.

<note>Controls moraju funkcionirati za **Design-Time** (VS Code Designer) i **Runtime** (Desktop/TUI/Web).</note>

===== Pregled =====

Control se sastoji od više slojeva:

^ Sloj ^ Svrha ^ Putanja ^
| Runtime Model | Target-neutralna logika | ''~/sources/common/ui/controls/{category}/'' |
| Target Renderer | Target-specifični prikaz | ''~/sources/common/ui/targets/{target}/renderers/'' |
| Pack Manifest | PXAML-Tag → Klasa Mapping | ''~/packs/controls/{control_id}/'' |
| Designer Metadata | Toolbox, Properties, Events | ''~/sources/extensions/wvds.vscode.ui.meta/'' |

===== Varijable =====

Pri kreiranju Controla definirajte ove varijable:

^ Varijabla ^ Primjer ^ Opis ^
| ''{CONTROL_ID}'' | ''dateedit'' | Jedinstveni identifikator (lowercase) |
| ''{CONTROL_CLASS}'' | ''TWvdSDateEdit'' | Pascal-naziv klase |
| ''{PXAML_TAG}'' | ''DateEdit'' | Naziv taga u PXAML-u |
| ''{PXAML_NS}'' | ''wvds'' | Namespace (wvds za interne Controls) |
| ''{TARGETS}'' | ''tui,desktop,web'' | Podržani targeti |

===== Workflow (7 koraka) =====

==== Korak 1: Contract Freeze ====

Definirajte javni API Controla:

**Properties:**
<code pascal>
(* Minimalni skup javnih Properties *)
property Value: TDateTime read FValue write SetValue;
property Format: string read FFormat write SetFormat;
property MinDate: TDateTime read FMinDate write FMinDate;
property MaxDate: TDateTime read FMaxDate write FMaxDate;
property ReadOnly: Boolean read FReadOnly write FReadOnly;
</code>

**Events:**
<code pascal>
(* Potrebni Events *)
property OnValueChanged: TWvdSNotifyEvent read FOnValueChanged write FOnValueChanged;
property OnValidating: TWvdSValidateEvent read FOnValidating write FOnValidating;
</code>

**TargetCaps:**

^ Capability ^ TUI ^ Desktop ^ Web ^
| Keyboard | Required | Required | Required |
| Mouse | Optional | Required | Required |
| Touch | N/A | Optional | Optional |
| Popup | Optional | Required | Required |

==== Korak 2: Runtime Model Unit ====

Kreirajte target-neutralnu Model-Unit:

**Putanja:** ''~/sources/common/ui/controls/{category}/WvdS.UI.Controls.{Category}.{ControlId}.pas''

<code pascal>
unit WvdS.UI.Controls.Editors.DateEdit;

{$mode objfpc}{$H+}

interface

uses
  WvdS.UI.Core.Base,
  WvdS.UI.Core.Events;

type
  (*
    @abstract(Polje za unos datuma s Kalender-Popupom)

    Target-neutralni Model za DateEdit.
    Ne sadrži ovisnosti o Renderingu ili Hostu.
  *)
  TWvdSDateEdit = class(TWvdSControl)
  private
    FValue: TDateTime;
    FFormat: string;
    FOnValueChanged: TWvdSNotifyEvent;
    procedure SetValue(AValue: TDateTime);
  protected
    procedure DoValueChanged; virtual;
  public
    constructor Create(AOwner: TWvdSComponent); override;
    property Value: TDateTime read FValue write SetValue;
    property Format: string read FFormat write FFormat;
    property OnValueChanged: TWvdSNotifyEvent read FOnValueChanged write FOnValueChanged;
  end;

implementation

(* Implementacija bez Target-specifičnog koda *)

end.
</code>

<note warning>**Bez Target-specifičnih ovisnosti!** Nema DOM-a, nema Terminal-I/O-a, nema LCL-Units.</note>

==== Korak 3: Target Renderer Units ====

Za svaki Target u ''{TARGETS}'' kreirajte Renderer:

=== TUI Renderer ===

**Putanja:** ''~/sources/common/ui/targets/tui/renderers/WvdS.UI.TUI.Renderers.DateEdit.pas''

<code pascal>
unit WvdS.UI.TUI.Renderers.DateEdit;

{$mode objfpc}{$H+}

interface

uses
  WvdS.UI.TUI.Renderer.Base,
  WvdS.UI.Controls.Editors.DateEdit;

type
  TWvdSTUIDateEditRenderer = class(TWvdSTUIRenderer)
  public
    procedure Measure(AControl: TWvdSControl; out AWidth, AHeight: Integer); override;
    procedure Paint(AControl: TWvdSControl; ACanvas: TWvdSTUICanvas); override;
    procedure HandleInput(AControl: TWvdSControl; AEvent: TWvdSInputEvent); override;
  end;

implementation

procedure TWvdSTUIDateEditRenderer.Measure(AControl: TWvdSControl; out AWidth, AHeight: Integer);
begin
  AWidth := 12;  (* [YYYY-MM-DD] *)
  AHeight := 1;
end;

procedure TWvdSTUIDateEditRenderer.Paint(AControl: TWvdSControl; ACanvas: TWvdSTUICanvas);
var
  DateEdit: TWvdSDateEdit;
begin
  DateEdit := AControl as TWvdSDateEdit;
  ACanvas.DrawText(0, 0, FormatDateTime(DateEdit.Format, DateEdit.Value));
end;

procedure TWvdSTUIDateEditRenderer.HandleInput(AControl: TWvdSControl; AEvent: TWvdSInputEvent);
begin
  (* Keyboard-Handling za promjenu datuma *)
end;

end.
</code>

=== Desktop Renderer ===

**Putanja:** ''~/sources/common/ui/targets/gui/renderers/WvdS.UI.Desktop.Renderers.DateEdit.pas''

=== Web Renderer ===

**Putanja:** ''~/sources/common/ui/targets/web/renderers/WvdS.UI.Web.Renderers.DateEdit.pas''

==== Korak 4: Pack Manifest ====

Kreirajte Pack-Manifest za PXAML-Resolver:

**Putanja:** ''~/packs/controls/{control_id}/pack.wvds.json''

<code javascript>
{
  "id": "dateedit",
  "vendor": "wvds",
  "version": "0.1.0",
  "xml": {
    "namespace": "wvds",
    "tag": "DateEdit"
  },
  "model": {
    "unit": "WvdS.UI.Controls.Editors.DateEdit",
    "class": "TWvdSDateEdit"
  },
  "renderers": {
    "tui": {
      "unit": "WvdS.UI.TUI.Renderers.DateEdit",
      "class": "TWvdSTUIDateEditRenderer"
    },
    "desktop": {
      "unit": "WvdS.UI.Desktop.Renderers.DateEdit",
      "class": "TWvdSDesktopDateEditRenderer"
    },
    "web": {
      "unit": "WvdS.UI.Web.Renderers.DateEdit",
      "class": "TWvdSWebDateEditRenderer"
    }
  },
  "targetCaps": {
    "requires": ["keyboard"],
    "optional": ["mouse", "popup"]
  }
}
</code>

==== Korak 5: Designer Metadata ====

Kreirajte Designer-Metapodatke za Toolbox i Properties:

**Dodajte Descriptor u:** ''~/sources/common/core/meta/WvdS.Meta.Controls.Editors.pas''

<code pascal>
procedure RegisterDateEditMeta(ARegistry: TMetaRegistry);
var
  TypeMeta: TTypeMeta;
begin
  TypeMeta := CreateTypeMeta('DateEdit', 'TWvdSDateEdit', 'Editors');
  TypeMeta.Description := 'Polje za unos datuma s Kalender-Popupom';
  TypeMeta.Icon := 'calendar';

  (* Properties *)
  TypeMeta.AddProperty(CreatePropertyMeta('Value', pkDateTime, 'Trenutna vrijednost datuma'));
  TypeMeta.AddProperty(CreatePropertyMeta('Format', pkString, 'Format prikaza (npr. yyyy-mm-dd)'));
  TypeMeta.AddProperty(CreatePropertyMeta('MinDate', pkDateTime, 'Najraniji dozvoljeni datum'));
  TypeMeta.AddProperty(CreatePropertyMeta('MaxDate', pkDateTime, 'Najkasniji dozvoljeni datum'));
  TypeMeta.AddProperty(CreatePropertyMeta('ReadOnly', pkBoolean, 'Način samo za čitanje'));

  (* Events *)
  TypeMeta.AddEvent(CreateEventMeta('OnValueChanged', 'Aktivira se kada se Value promijeni'));
  TypeMeta.AddEvent(CreateEventMeta('OnValidating', 'Aktivira se prije promjene vrijednosti'));

  ARegistry.RegisterType(TypeMeta);
end;
</code>

==== Korak 6: Registry-Registracija ====

Registrirajte Control u Runtime-Registries:

=== PXAML Resolver ===

''pxamlc'' Compiler automatski čita ''pack.wvds.json'' iz ''~/packs/''.

=== Target Runtime Registry ===

Za svaki Target ažurirajte Renderer-Registry:

<code pascal>
(* U WvdS.UI.TUI.Render.Registry.pas *)
procedure RegisterTUIRenderers;
begin
  (* ... ostali Rendereri ... *)
  RegisterRenderer(TWvdSDateEdit, TWvdSTUIDateEditRenderer);
end;
</code>

==== Korak 7: Dokumentacija ====

Kreirajte API-dokumentaciju za Control:

**Putanja:** ''~/docs/api/controls/dateedit.md''

<code markdown>
# TWvdSDateEdit

Polje za unos datuma s opcionalnim Kalender-Popupom.

## Kada koristiti

- Korisnik treba unijeti datum
- Ograničavanje raspona datuma (MinDate/MaxDate)
- Potreban formatirani prikaz datuma

## Properties

| Property | Tip | Opis |
|----------|-----|------|
| Value | TDateTime | Trenutna vrijednost datuma |
| Format | string | Format prikaza |
| MinDate | TDateTime | Najraniji dozvoljeni datum |
| MaxDate | TDateTime | Najkasniji dozvoljeni datum |
| ReadOnly | Boolean | Način samo za čitanje |

## Events

| Event | Opis |
|-------|------|
| OnValueChanged | Aktivira se kada se Value promijeni |
| OnValidating | Omogućuje validaciju prije promjene vrijednosti |

## Primjer

```xml
<DateEdit Value="{Binding BirthDate}"
          Format="dd.MM.yyyy"
          MinDate="1900-01-01"
          MaxDate="2100-12-31" />
```
</code>

===== Completion Criteria =====

Control je završen kada:

<code>
[ ] VS Code Designer može postaviti {PXAML_NS}:{PXAML_TAG}
[ ] Properties se mogu uređivati u Designeru
[ ] Preview u Designeru funkcionira
[ ] Target Build (tui/desktop/web) kompilira uspješno
[ ] Pack Manifest prisutan i prepoznat od Resolvera
[ ] API-dokumentacija napisana
</code>

===== Vidi također =====

  * [[.:pxaml-pipeline|PXAML-Pipeline]]
  * [[.:pack-struktur|Pack-Struktura]]
  * [[.:targets|Build-Targets]]
  * [[.:meta-api|Meta API]]