# Zoom

Images zoom with pinch (or Ctrl + wheel), double-tap, double-click and the `+`, `-` and `0` keys, and pan while zoomed. Each viewer can set how far a double-tap zooms (`step`) and how far zoom goes (`max`), or turn zoom off.

#### React

`zoom.tsx`

```tsx
import { itemLabel } from "@ogdakke/fluidbox";
import { Fluidbox, type FluidboxRootProps } from "@ogdakke/fluidbox/react";
import { photos } from "./data";

function Gallery({ zoom }: Pick<FluidboxRootProps, "zoom">) {
  return (
    <Fluidbox.Root items={photos} zoom={zoom}>
      <div className="pattern-grid">
        {photos.map((photo) => (
          <Fluidbox.Trigger
            key={photo.src}
            item={photo}
            className="pattern-thumb"
          >
            <img src={photo.src} alt={itemLabel(photo)} />
          </Fluidbox.Trigger>
        ))}
      </div>
    </Fluidbox.Root>
  );
}

export function Zoom() {
  return (
    <>
      {/* Double-click zooms to 3x; pinch and wheel stop at 6x. */}
      <Gallery zoom={{ step: 3, max: 6 }} />
      <Gallery zoom={false} />
    </>
  );
}
```

#### Vue

`Zoom.vue`

```vue
<script setup lang="ts">
import { itemLabel } from "@ogdakke/fluidbox";
import { Fluidbox } from "@ogdakke/fluidbox/vue";
import { photos } from "./data";
</script>

<template>
  <Fluidbox.Root :items="photos" :zoom="{ step: 3, max: 6 }">
    <div class="pattern-grid">
      <Fluidbox.Trigger
        v-for="photo in photos"
        :key="photo.id"
        :item="photo"
        class="pattern-thumb"
      >
        <img :src="photo.src" :alt="itemLabel(photo)" />
      </Fluidbox.Trigger>
    </div>
  </Fluidbox.Root>

  <Fluidbox.Root :items="photos" :zoom="false">
    <div class="pattern-grid">
      <Fluidbox.Trigger
        v-for="photo in photos"
        :key="photo.id"
        :item="photo"
        class="pattern-thumb"
      >
        <img :src="photo.src" :alt="itemLabel(photo)" />
      </Fluidbox.Trigger>
    </div>
  </Fluidbox.Root>
</template>
```

#### Solid

`zoom.tsx`

```tsx
import { For } from "solid-js";
import { itemLabel } from "@ogdakke/fluidbox";
import { Fluidbox, type FluidboxRootProps } from "@ogdakke/fluidbox/solid";
import { photos } from "./data";

function Gallery(props: { zoom: FluidboxRootProps["zoom"] }) {
  return (
    <Fluidbox.Root items={photos} zoom={props.zoom}>
      <div class="pattern-grid">
        <For each={photos}>
          {(photo) => (
            <Fluidbox.Trigger item={photo} class="pattern-thumb">
              <img src={photo.src} alt={itemLabel(photo)} />
            </Fluidbox.Trigger>
          )}
        </For>
      </div>
    </Fluidbox.Root>
  );
}

export function Zoom() {
  return (
    <>
      <Gallery zoom={{ step: 3, max: 6 }} />
      <Gallery zoom={false} />
    </>
  );
}
```

#### Angular

`zoom.ts`

```ts
import { Component } from "@angular/core";
import { itemLabel } from "@ogdakke/fluidbox";
import { FluidboxModule } from "@ogdakke/fluidbox/angular";
import { photos } from "./data";

@Component({
  selector: "pattern-zoom",
  standalone: true,
  imports: [FluidboxModule],
  template: `
    <div fluidboxRoot [items]="photos" [zoom]="{ step: 3, max: 6 }" class="pattern-grid">
      @for (photo of photos; track photo.id) {
        <button [fluidboxTrigger]="photo" class="pattern-thumb">
          <img [src]="photo.src" [alt]="label(photo)" />
        </button>
      }
    </div>
    <div fluidboxRoot [items]="photos" [zoom]="false" class="pattern-grid">
      @for (photo of photos; track photo.id) {
        <button [fluidboxTrigger]="photo" class="pattern-thumb">
          <img [src]="photo.src" [alt]="label(photo)" />
        </button>
      }
    </div>
  `,
})
export class Zoom {
  readonly photos = photos;
  readonly label = itemLabel;
}
```

#### Elements

`zoom.html`

```html
<fluidbox-gallery class="pattern-grid" zoom-step="3" zoom-max="6">
  <fluidbox-item item-id="photo-aurora">
    <button slot="trigger" type="button" class="pattern-thumb">
      <img src="/art/aurora.svg" alt="Aurora over the tundra" />
    </button>
    <template slot="content">
      <img src="/art/aurora.svg" alt="Aurora over the tundra" width="1100" height="1650" />
    </template>
  </fluidbox-item>
  <fluidbox-item item-id="photo-ridge">
    <button slot="trigger" type="button" class="pattern-thumb">
      <img src="/art/ridge.svg" alt="Night ridge" />
    </button>
    <template slot="content">
      <img src="/art/ridge.svg" alt="Night ridge" width="1200" height="1500" />
    </template>
  </fluidbox-item>
  <fluidbox-item item-id="photo-fjord">
    <button slot="trigger" type="button" class="pattern-thumb">
      <img src="/art/fjord.svg" alt="Fjord in the blue hour" />
    </button>
    <template slot="content">
      <img src="/art/fjord.svg" alt="Fjord in the blue hour" width="1200" height="1600" />
    </template>
  </fluidbox-item>
  <fluidbox-item item-id="photo-lagoon">
    <button slot="trigger" type="button" class="pattern-thumb">
      <img src="/art/lagoon.svg" alt="Lagoon after sunset" />
    </button>
    <template slot="content">
      <img src="/art/lagoon.svg" alt="Lagoon after sunset" width="1800" height="1200" />
    </template>
  </fluidbox-item>
</fluidbox-gallery>
<fluidbox-gallery class="pattern-grid" nozoom>
  <fluidbox-item item-id="photo-aurora">
    <button slot="trigger" type="button" class="pattern-thumb">
      <img src="/art/aurora.svg" alt="Aurora over the tundra" />
    </button>
    <template slot="content">
      <img src="/art/aurora.svg" alt="Aurora over the tundra" width="1100" height="1650" />
    </template>
  </fluidbox-item>
  <fluidbox-item item-id="photo-ridge">
    <button slot="trigger" type="button" class="pattern-thumb">
      <img src="/art/ridge.svg" alt="Night ridge" />
    </button>
    <template slot="content">
      <img src="/art/ridge.svg" alt="Night ridge" width="1200" height="1500" />
    </template>
  </fluidbox-item>
  <fluidbox-item item-id="photo-fjord">
    <button slot="trigger" type="button" class="pattern-thumb">
      <img src="/art/fjord.svg" alt="Fjord in the blue hour" />
    </button>
    <template slot="content">
      <img src="/art/fjord.svg" alt="Fjord in the blue hour" width="1200" height="1600" />
    </template>
  </fluidbox-item>
  <fluidbox-item item-id="photo-lagoon">
    <button slot="trigger" type="button" class="pattern-thumb">
      <img src="/art/lagoon.svg" alt="Lagoon after sunset" />
    </button>
    <template slot="content">
      <img src="/art/lagoon.svg" alt="Lagoon after sunset" width="1800" height="1200" />
    </template>
  </fluidbox-item>
</fluidbox-gallery>
```

#### JavaScript

`zoom.ts`

```ts
import { createFluidbox, itemLabel, type FluidboxOptions } from "@ogdakke/fluidbox";
import { photos } from "./data";

function gallery(root: HTMLElement, zoom: FluidboxOptions["zoom"]) {
  const fluidbox = createFluidbox({ items: photos, zoom });
  const grid = document.createElement("div");
  grid.className = "pattern-grid";
  photos.forEach((photo, index) => {
    const button = document.createElement("button");
    button.type = "button";
    button.className = "pattern-thumb";
    button.append(Object.assign(new Image(), { src: photo.src, alt: itemLabel(photo) }));
    grid.append(button);
    fluidbox.bind(button, index);
  });
  root.append(grid);
  return () => {
    fluidbox.destroy();
    grid.remove();
  };
}

export function mountZoom(root: HTMLElement) {
  const disposers = [gallery(root, { step: 3, max: 6 }), gallery(root, false)];
  return () => disposers.forEach((dispose) => dispose());
}
```

- `zoom: { step, max }` or `zoom: false` on the viewer. The custom elements also read the `zoom-step`, `zoom-max` and `nozoom` attributes.
- Zoom options apply live, even while the viewer is open. Call `fluidbox.update({ zoom })`, or set a new `zoom` prop or property. Turning zoom off zooms a zoomed photo back out.
- `step` defaults to `2` and `max` to `4`.
- While zoomed, the dialog has `data-zoomed`. Pans can reach under the browser's bars; set `--fluidbox-zoom-bleed: 0px` to keep them inside the window, or `--fluidbox-zoom-clip` to keep them inside the stage insets.