memEx/lib/memex_web/views/view_helpers.ex
2023-02-14 01:04:15 -05:00

97 lines
2.6 KiB
Elixir

defmodule MemexWeb.ViewHelpers do
@moduledoc """
Contains common helpers that can be used in liveviews and regular views. These
are automatically imported into any Phoenix View using `use MemexWeb,
:view`
"""
use Phoenix.Component
@doc """
Phoenix.Component for a <time> element that renders the naivedatetime in the
user's local timezone with Alpine.js
"""
attr :datetime, :any, required: true, doc: "A `DateTime` struct or nil"
def datetime(assigns) do
~H"""
<time
:if={@datetime}
datetime={cast_datetime(@datetime)}
x-data={"{
datetime:
Intl.DateTimeFormat([], {dateStyle: 'short', timeStyle: 'long'})
.format(new Date(\"#{cast_datetime(@datetime)}\"))
}"}
x-text="datetime"
>
<%= cast_datetime(@datetime) %>
</time>
"""
end
@spec cast_datetime(NaiveDateTime.t() | nil) :: String.t()
defp cast_datetime(%NaiveDateTime{} = datetime) do
datetime |> DateTime.from_naive!("Etc/UTC") |> DateTime.to_iso8601(:extended)
end
defp cast_datetime(_datetime), do: ""
@doc """
Phoenix.Component for a <date> element that renders the Date in the user's
local timezone with Alpine.js
"""
attr :date, :any, required: true, doc: "A `Date` struct or nil"
def date(assigns) do
~H"""
<time
:if={@date}
datetime={@date |> Date.to_iso8601(:extended)}
x-data={"{
date:
Intl.DateTimeFormat([], {timeZone: 'Etc/UTC', dateStyle: 'short'})
.format(new Date(\"#{@date |> Date.to_iso8601(:extended)}\"))
}"}
x-text="date"
>
<%= @date |> Date.to_iso8601(:extended) %>
</time>
"""
end
@doc """
Displays content in a QR code as a base64 encoded PNG
"""
@spec qr_code_image(String.t()) :: String.t()
@spec qr_code_image(String.t(), width :: non_neg_integer()) :: String.t()
def qr_code_image(content, width \\ 384) do
img_data =
content
|> EQRCode.encode()
|> EQRCode.png(width: width, background_color: <<24, 24, 27>>, color: <<255, 255, 255>>)
|> Base.encode64()
"data:image/png;base64," <> img_data
end
@doc """
Creates a downloadable QR Code element
"""
attr :content, :string, required: true
attr :filename, :string, default: "qrcode", doc: "filename without .png extension"
attr :image_class, :string, default: "w-64 h-max"
attr :width, :integer, default: 384, doc: "width of png to generate"
def qr_code(assigns) do
~H"""
<a href={qr_code_image(@content)} download={@filename <> ".png"}>
<img class={@image_class} alt={@filename} src={qr_code_image(@content)} />
</a>
"""
end
end