# Responsive

> Builds its content from the space actually available. A native Pyzed component for Python desktop GUIs, with a live preview, code examples and its API.

Source: https://albakore.github.io/pyzed/library/responsive/

:::tip[In plain words]
Changes the layout depending on how much room there is, like a phone versus a monitor.
:::

Calls `function(width, height)` with the space it really gets and shows what it returns, so the layout can adapt: hide a sidebar when the window is narrow, change the number of columns…

`pz.responsive` · Category: [Layout](https://albakore.github.io/pyzed/library/#layout) · [Full reference →](https://albakore.github.io/pyzed/reference/widgets/#responsive)

**Code:**

```python
box = lambda text, w=90, h=44: pz.container(ui.label(text), center=True, width=w, height=h, bg=pz.theme.current().element, radius=6)
pz.container(pz.responsive(lambda w, h: pz.center(pz.column([
    ui.muted(f"{w:.0f} × {h:.0f} px available"),
    pz.row([box("1"), box("2"), box("3"), box("4")], spacing=8) if w > 400 else
    pz.column([box("1"), box("2")], spacing=8),
], spacing=10, align="center"))), width=480, height=150)
```

## When to use

- For layouts that must work both in a small and a large window.

## Usage

```python
import pyzed as pz
from pyzed import ui

box = lambda text, w=90, h=44: pz.container(ui.label(text), center=True, width=w, height=h, bg=pz.theme.current().element, radius=6)
pz.container(pz.responsive(lambda w, h: pz.center(pz.column([
    ui.muted(f"{w:.0f} × {h:.0f} px available"),
    pz.row([box("1"), box("2"), box("3"), box("4")], spacing=8) if w > 400 else
    pz.column([box("1"), box("2")], spacing=8),
], spacing=10, align="center"))), width=480, height=150)
```

## Variants

:::note[About these captures]
Each capture is recorded by pyzed itself, off-screen at 2x, in One Dark or One Light to match this site's theme, and cropped to the component so it shows at its real size. The pointer hovers, presses or types into it; a component that does not react to the pointer cycles through a few themes. With reduced motion you see the first frame. Open **Code** under a capture to see the snippet that draws it; free names such as `on_save` stand for your own callbacks.
:::

### Available width

The same code, given two widths: the layout changes by itself.

```python
box = lambda text, w=90, h=44: pz.container(ui.label(text), center=True, width=w, height=h, bg=pz.theme.current().element, radius=6)
pz.container(pz.responsive(lambda w, h: pz.row([box("1"), box("2"), box("3")], spacing=8)
             if w > 300 else pz.column([box("1"), box("2")], spacing=8)), width=200, height=110)
```

```python
box = lambda text, w=90, h=44: pz.container(ui.label(text), center=True, width=w, height=h, bg=pz.theme.current().element, radius=6)
pz.container(pz.responsive(lambda w, h: pz.row([box("1"), box("2"), box("3")], spacing=8)
             if w > 300 else pz.column([box("1"), box("2")], spacing=8)), width=400, height=60)
```

## Events

Responsive has no events of its own: it shows what you give it. Like every widget it also has the **18 common events** (`click`, `double_click`, `right_click`, `mouse_enter`, `drag`, `key_down`, `resize`…), attached with `.on(...)`: see [Events](https://albakore.github.io/pyzed/guides/events/) and [Events of every component](https://albakore.github.io/pyzed/library/events/).

## Properties and API

### `pz.responsive`

```python
responsive(function)
```

Builds its content with `function(width, height)` using the space actually available, so the layout can adapt (for example, hiding a sidebar when the window is narrow).

| Property | Default | Description |
| --- | --- | --- |
| `function` | *required* | Function that receives `(width, height)` and returns a widget. |

[Full reference →](https://albakore.github.io/pyzed/reference/widgets/#responsive)

## Related

- [Grid](https://albakore.github.io/pyzed/library/grid/): Equal columns, or CSS-like tracks with spans.
- [Flex](https://albakore.github.io/pyzed/library/flex/): CSS flexbox: justify, align, gap, wrap and grow.