Campo de firma para Angular | ng-hub-ui-signature
Campo de firma Angular accesible que guarda trazos de ratón, táctil y lápiz como SVG escalable para formularios, con deshacer, rehacer y exportación PNG.
Estilos
Mixins y estilos
Override the `--hub-signature-*` design tokens in a single include, without coupling the consumer to the component's DOM. Every parameter is OPTIONAL and defaults to `null`: only the parameters you pass are emitted, so the tokens you leave alone keep resolving through their own defaults. An include with no arguments would therefore emit nothing at all, which reads as a broken build rather than as a no-op — so it raises a `@warn` instead of failing silently. Token-based and self-contained (no Bootstrap dependencies).
Theming with hub-signature-theme
Sign with the keyboard: arrow keys move the pen, holding Shift moves it further, Space or Enter lowers and lifts it, and Escape discards the stroke in progress.
| Mixin | Parámetros | Descripción |
|---|---|---|
| Theming | ||
hub-signature-theme() | $background, $color, $border-color, $border-radius, $focus-border-color, $border-width, $focus-shadow, $font-size, $label-color, $label-font-size, $actions-gap | One-call theming for `<hub-signature>` |
Variables CSS
Personaliza cada detalle con 11 variables CSS. Sobrescríbelas en :root o acótalas a un contenedor.
Signature
Design tokens read by this component. Override them on the host element (or any ancestor) to customize; every default falls back to the ng-hub-ui-ds layer.
| Variable | Por defecto | Tipo | Descripción |
|---|---|---|---|
--hub-signature-bg | var(--hub-input-bg, var(--hub-sys-surface, #fff)) | color | Drawing-surface background |
--hub-signature-color | var(--hub-input-color, var(--hub-sys-text-primary, #212529)) | color | Field text colour |
--hub-signature-border-color | var(--hub-input-border-color, var(--hub-sys-border, #ced4da)) | color | Drawing-surface border colour |
--hub-signature-border-width | var(--hub-input-border-width, 1px) | length | Drawing-surface border thickness |
--hub-signature-border-radius | var(--hub-input-border-radius, var(--hub-ref-radius-md, 0.375rem)) | length | Drawing-surface corner radius |
--hub-signature-focus-border-color | var(--hub-input-focus-border-color, var(--hub-sys-color-primary, #0d6efd)) | color | Border colour while the surface holds keyboard focus |
--hub-signature-focus-shadow | var(--hub-input-focus-box-shadow, 0 0 0 0.25rem rgb(13 110 253 / 25%)) | shadow | Focus ring around the drawing surface |
--hub-signature-label-color | var(--hub-label-color, var(--hub-sys-text-primary, #212529)) | color | Field label colour |
--hub-signature-label-font-size | var(--hub-label-font-size, var(--hub-ref-font-size-sm, 0.875rem)) | length | Field label font size |
--hub-signature-font-size | var(--hub-input-font-size, 1rem) | length | Field font size |
--hub-signature-actions-gap | var(--hub-ref-space-2, 0.5rem) | length | Gap between the clear / undo / redo actions |
Estilos y theming
Load the forms stylesheet
The chrome around the canvas is not the signature's. Its root element is class="hub-field hub-signature" and the label row, the helper text, the validation feedback and the ? mark that opens it are all defined in ng-hub-ui-forms, so @use 'ng-hub-ui-forms/styles'; belongs in the application's global stylesheet, once. Skip it and the canvas still looks right while the text under it falls back to unstyled body copy and the ? mark, glyph and circle included, is left as an empty button. Add @use 'ng-hub-ui-utils/styles/tooltip'; too when the field uses formTextType="tooltip": the bubble is appended to <body>, out of reach of the sheet above. Neither is replaced by ng-hub-ui-signature/styles, which forwards the theming mixin and emits no chrome.
Match the form theme
The field inherits the forms token family and accepts a local signature token override. Validation is part of that inheritance: the invalid and valid states colour the drawing surface from the shared --hub-form-* contract, so a signature turns red alongside the inputs around it rather than printing a message under a canvas that still looks fine.
Ejemplos:
Heredar el tema del formulario
Da tema al formulario una vez y la firma le sigue: sus slots caen por defecto en --hub-input-* para la superficie de dibujo y --hub-label-* para la etiqueta, así que no hace falta ni una regla --hub-signature-*. Fíjate en la asimetría: esto funciona desde un contenedor porque esos tokens se leen con var() del valor heredado, mientras que --hub-signature-* se declara sobre el propio elemento del campo y habría que sobreescribirlo ahí.
Sign with the keyboard: arrow keys move the pen, holding Shift moves it further, Space or Enter lowers and lifts it, and Escape discards the stroke in progress.
Código
Import:
Template:
Component: