97 lines
2.6 KiB
Elixir
97 lines
2.6 KiB
Elixir
defmodule MemexWeb.ViewHelpers do
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@moduledoc """
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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
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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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<time
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:if={@datetime}
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datetime={cast_datetime(@datetime)}
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x-data={"{
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datetime:
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Intl.DateTimeFormat([], {dateStyle: 'short', timeStyle: 'long'})
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.format(new Date(\"#{cast_datetime(@datetime)}\"))
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}"}
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x-text="datetime"
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>
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<%= cast_datetime(@datetime) %>
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</time>
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"""
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end
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@spec cast_datetime(NaiveDateTime.t() | nil) :: String.t()
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defp cast_datetime(%NaiveDateTime{} = datetime) do
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datetime |> DateTime.from_naive!("Etc/UTC") |> DateTime.to_iso8601(:extended)
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end
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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
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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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<time
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:if={@date}
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datetime={@date |> Date.to_iso8601(:extended)}
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x-data={"{
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date:
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Intl.DateTimeFormat([], {timeZone: 'Etc/UTC', dateStyle: 'short'})
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.format(new Date(\"#{@date |> Date.to_iso8601(:extended)}\"))
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}"}
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x-text="date"
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>
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<%= @date |> Date.to_iso8601(:extended) %>
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</time>
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"""
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end
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@doc """
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Displays content in a QR code as a base64 encoded PNG
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"""
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@spec qr_code_image(String.t()) :: String.t()
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@spec qr_code_image(String.t(), width :: non_neg_integer()) :: String.t()
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def qr_code_image(content, width \\ 384) do
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img_data =
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content
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|> EQRCode.encode()
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|> EQRCode.png(width: width, background_color: <<24, 24, 27>>, color: <<255, 255, 255>>)
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|> Base.encode64()
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"data:image/png;base64," <> img_data
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end
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@doc """
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Creates a downloadable QR Code element
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"""
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attr :content, :string, required: true
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attr :filename, :string, default: "qrcode", doc: "filename without .png extension"
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attr :image_class, :string, default: "w-64 h-max"
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attr :width, :integer, default: 384, doc: "width of png to generate"
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def qr_code(assigns) do
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~H"""
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<a href={qr_code_image(@content)} download={@filename <> ".png"}>
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<img class={@image_class} alt={@filename} src={qr_code_image(@content)} />
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</a>
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"""
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end
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end
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