memEx/lib/memex_web/views/view_helpers.ex

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Elixir
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defmodule MemexWeb.ViewHelpers do
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@moduledoc """
Contains common helpers that can be used in liveviews and regular views. These
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are automatically imported into any Phoenix View using `use MemexWeb,
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:view`
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"""
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use Phoenix.Component
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@doc """
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Phoenix.Component for a <time> element that renders the naivedatetime in the
user's local timezone with Alpine.js
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"""
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attr :datetime, :any, required: true, doc: "A `DateTime` struct or nil"
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def datetime(assigns) do
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~H"""
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<%= if @datetime do %>
<time
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 %>
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"""
end
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@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: ""
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@doc """
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Phoenix.Component for a <date> element that renders the Date in the user's
local timezone with Alpine.js
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"""
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attr :date, :any, required: true, doc: "A `Date` struct or nil"
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def date(assigns) do
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~H"""
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<%= if @date do %>
<time
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 %>
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"""
end
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@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: <<39, 39, 42>>, 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
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end