defmodule DiogramosWeb.CanvasLive.Edit do
use DiogramosWeb, :live_view
alias Diogramos.Diagrams
alias Diogramos.Diagrams.{Authority, ConnectorGeometry, Document, MermaidExport}
alias DiogramosWeb.CanvasPresence
@tools ~w(select text rect rounded circle connector)
@impl true
def mount(%{"slug" => slug}, _session, socket) do
scope = socket.assigns.current_scope
case Diagrams.get_canvas_by_slug(scope, slug) do
nil ->
{:ok,
socket
|> put_flash(:error, "Canvas not found.")
|> push_navigate(to: ~p"/canvases")}
canvas ->
role = Diagrams.effective_role(scope, canvas)
{document, version} =
case Authority.snapshot(canvas.id) do
{:ok, %{document: d, version: v}} -> {d, v}
_ -> {ensure_document_shape(canvas.document), canvas.version}
end
topic = Authority.topic(canvas.id)
identity = presence_identity(scope)
if connected?(socket) do
Phoenix.PubSub.subscribe(Diogramos.PubSub, topic)
CanvasPresence.track(self(), topic, identity)
end
actor_ref = "lv-#{System.unique_integer([:positive])}"
{:ok,
socket
|> assign(:page_title, canvas.title)
|> assign(:canvas, %{canvas | document: document, version: version})
|> assign(:role, role)
|> assign(:read_only, role == "viewer")
|> assign(:document, document)
|> assign(:version, version)
|> assign(:tool, "select")
|> assign(:selection, [])
|> assign(:selection_clipboard, nil)
|> assign(:actor_ref, actor_ref)
|> assign(:show_mermaid, false)
|> assign(:mermaid_source, "")
|> assign(:topic, topic)
|> assign(:presence_key, identity.key)
|> assign(:peers, [])
|> assign(:locked_elements, MapSet.new())
|> assign(:style_clipboard, nil)
|> assign(:snap_grid, false)
|> assign(:grid_size, 20)
|> assign(:show_embed_cursors, true)}
end
end
defp presence_identity(%{user: %{id: id, email: email, display_name: display_name}}) do
%{
key: "user-#{id}",
name: display_name || (email && hd(String.split(email, "@"))) || "Guest #{id}"
}
end
defp presence_identity(_) do
%{key: "anon-#{System.unique_integer([:positive])}", name: "Guest"}
end
@impl true
def handle_info({:canvas_op, %{op: op, version: version, actor_ref: ref}}, socket) do
cond do
ref == socket.assigns.actor_ref ->
{:noreply, socket}
version <= socket.assigns.version ->
{:noreply, socket}
true ->
case Document.apply_op(socket.assigns.document, op) do
{:ok, doc} -> {:noreply, assign(socket, document: doc, version: version)}
{:error, _} -> {:noreply, socket}
end
end
end
def handle_info(%Phoenix.Socket.Broadcast{event: "presence_diff"}, socket) do
{:noreply, refresh_peers(socket)}
end
@impl true
def handle_event("select_tool", %{"tool" => tool}, socket) when tool in @tools do
{:noreply, assign(socket, tool: tool, selection: [])}
end
def handle_event("select_element", params, socket) do
{:noreply, do_select(socket, {:element, params["id"]}, params["multi"] == true)}
end
def handle_event("select_connector", params, socket) do
{:noreply, do_select(socket, {:connector, params["id"]}, params["multi"] == true)}
end
def handle_event("select_set", params, socket) do
elements = for id <- params["elements"] || [], is_binary(id), do: {:element, id}
connectors = for id <- params["connectors"] || [], is_binary(id), do: {:connector, id}
{:noreply, assign(socket, :selection, elements ++ connectors)}
end
def handle_event("clear_selection", _, socket) do
{:noreply, assign(socket, :selection, [])}
end
def handle_event("apply_op", _params, %{assigns: %{read_only: true}} = socket) do
{:noreply, put_flash(socket, :error, "You only have view access to this canvas.")}
end
def handle_event("apply_op", %{"op" => op}, socket) do
apply_op_and_persist(socket, apply_clipboard_defaults(op, socket.assigns.style_clipboard))
end
def handle_event("update_selected", %{"props" => props}, socket) do
case selection_focus(socket.assigns.selection) do
{:element, id} ->
patch = coerce_element_patch(props, socket.assigns.document["elements"][id])
apply_op_and_persist(socket, %{"type" => "update_element", "id" => id, "patch" => patch})
{:connector, id} ->
patch = coerce_connector_patch(props)
apply_op_and_persist(socket, %{"type" => "update_connector", "id" => id, "patch" => patch})
_ ->
{:noreply, socket}
end
end
def handle_event("show_mermaid", _, socket) do
source = MermaidExport.to_mermaid(socket.assigns.document)
{:noreply, assign(socket, show_mermaid: true, mermaid_source: source)}
end
def handle_event("close_mermaid", _, socket) do
{:noreply, assign(socket, :show_mermaid, false)}
end
def handle_event("toggle_grid", _, socket) do
socket = update(socket, :snap_grid, &(!&1))
{:noreply, push_event(socket, "grid_changed", %{on: socket.assigns.snap_grid})}
end
def handle_event("toggle_embed_cursors", _, socket) do
{:noreply, socket |> update(:show_embed_cursors, &(!&1)) |> refresh_peers()}
end
def handle_event("set_grid", %{"on" => on}, socket) when is_boolean(on) do
{:noreply, assign(socket, :snap_grid, on)}
end
def handle_event("z_order", %{"action" => action}, socket)
when action in ~w(to_back backward forward to_front) do
case selection_focus(socket.assigns.selection) do
{:element, id} ->
new_order = reorder(socket.assigns.document["order"], id, action)
if new_order == socket.assigns.document["order"] do
{:noreply, socket}
else
apply_op_and_persist(socket, %{"type" => "set_z_order", "order" => new_order})
end
_ ->
{:noreply, socket}
end
end
def handle_event("cursor", %{"x" => x, "y" => y}, socket) when is_number(x) and is_number(y) do
CanvasPresence.update(self(), socket.assigns.topic, socket.assigns.presence_key, fn meta ->
Map.put(meta, :cursor, %{x: x, y: y})
end)
{:noreply, socket}
end
def handle_event("cursor", _, socket), do: {:noreply, socket}
def handle_event("set_lock", %{"id" => id}, socket) when is_binary(id) do
CanvasPresence.update(self(), socket.assigns.topic, socket.assigns.presence_key, fn meta ->
Map.put(meta, :lock, id)
end)
{:noreply, socket}
end
def handle_event("clear_lock", _, socket) do
CanvasPresence.update(self(), socket.assigns.topic, socket.assigns.presence_key, fn meta ->
Map.put(meta, :lock, nil)
end)
{:noreply, socket}
end
def handle_event("copy_style", _, socket) do
clipboard =
case selection_focus(socket.assigns.selection) do
{:element, id} ->
case socket.assigns.document["elements"][id] do
nil -> nil
element -> {:element, Map.get(element, "style", %{})}
end
{:connector, id} ->
case socket.assigns.document["connectors"][id] do
nil ->
nil
connector ->
{:connector,
Map.take(
connector,
~w(routing dash marker_start marker_end start_gap end_gap stroke_width color)
)}
end
_ ->
nil
end
{:noreply, assign(socket, :style_clipboard, clipboard)}
end
def handle_event("paste_style", _, socket) do
case {selection_focus(socket.assigns.selection), socket.assigns.style_clipboard} do
{{:element, id}, {:element, style}} when map_size(style) > 0 ->
apply_op_and_persist(socket, %{
"type" => "update_element",
"id" => id,
"patch" => %{"style" => style}
})
{{:connector, id}, {:connector, style}} when map_size(style) > 0 ->
apply_op_and_persist(socket, %{
"type" => "update_connector",
"id" => id,
"patch" => style
})
_ ->
{:noreply, put_flash(socket, :info, "Nothing matching to paste.")}
end
end
def handle_event("copy_selection", _, socket) do
el_ids = selection_element_ids(socket.assigns.selection)
con_ids = selection_connector_ids(socket.assigns.selection)
document = socket.assigns.document
elements = el_ids |> Enum.map(&document["elements"][&1]) |> Enum.reject(&is_nil/1)
el_set = MapSet.new(el_ids)
connectors =
con_ids
|> Enum.map(&document["connectors"][&1])
|> Enum.reject(&is_nil/1)
# Also include any connector both of whose endpoints were selected,
# even if the lasso didn't hit the connector itself.
|> Kernel.++(
Enum.filter(Map.values(document["connectors"]), fn c ->
c["from"]["element"] in el_set and c["to"]["element"] in el_set and
c["id"] not in con_ids
end)
)
|> Enum.uniq_by(& &1["id"])
if elements == [] and connectors == [] do
{:noreply, put_flash(socket, :info, "Nothing selected to copy.")}
else
{:noreply,
assign(socket, :selection_clipboard, %{elements: elements, connectors: connectors})}
end
end
def handle_event("paste_selection", _, %{assigns: %{read_only: true}} = socket) do
{:noreply, put_flash(socket, :error, "You only have view access to this canvas.")}
end
def handle_event("paste_selection", _, socket) do
case socket.assigns.selection_clipboard do
nil ->
{:noreply, put_flash(socket, :info, "Selection clipboard is empty.")}
%{elements: [], connectors: []} ->
{:noreply, put_flash(socket, :info, "Selection clipboard is empty.")}
%{elements: elements, connectors: connectors} ->
paste_offset = 24
id_map = Map.new(elements, fn e -> {e["id"], Diogramos.ULID.generate()} end)
new_elements = Enum.map(elements, &offset_and_remint(&1, id_map, paste_offset))
new_connectors = Enum.map(connectors, &remap_connector(&1, id_map))
socket =
new_elements
|> Enum.reduce(socket, fn element, socket ->
{_, s} =
apply_op_and_persist(socket, %{
"type" => "insert_element",
"element" => element
})
s
end)
socket =
new_connectors
|> Enum.reduce(socket, fn connector, socket ->
{_, s} =
apply_op_and_persist(socket, %{
"type" => "insert_connector",
"connector" => connector
})
s
end)
# Re-select the freshly pasted shapes so the user can keep moving them.
new_selection =
Enum.map(new_elements, &{:element, &1["id"]}) ++
Enum.map(new_connectors, &{:connector, &1["id"]})
{:noreply, assign(socket, :selection, new_selection)}
end
end
def handle_event("toggle_embed", _, socket) do
canvas = socket.assigns.canvas
result =
if canvas.embed_token do
Diagrams.set_canvas_embed_token(socket.assigns.current_scope, canvas, nil)
else
Diagrams.generate_canvas_embed_token(socket.assigns.current_scope, canvas)
end
case result do
{:ok, updated} ->
{:noreply, assign(socket, :canvas, updated)}
{:error, :forbidden} ->
{:noreply, put_flash(socket, :error, "Only owners can manage the embed token.")}
{:error, _} ->
{:noreply, put_flash(socket, :error, "Could not update embed.")}
end
end
def handle_event("add_link", %{"element_id" => id}, socket) do
case socket.assigns.document["elements"][id] do
nil ->
{:noreply, socket}
element ->
existing = element["links"] || []
new_link = %{
"enabled" => true,
"kind" => "external",
"target" => "",
"icon" => "link"
}
apply_op_and_persist(socket, %{
"type" => "update_element",
"id" => id,
"patch" => %{"links" => existing ++ [new_link]}
})
end
end
def handle_event("remove_link", %{"element_id" => id, "index" => idx}, socket) do
case socket.assigns.document["elements"][id] do
nil ->
{:noreply, socket}
element ->
existing = element["links"] || []
idx = String.to_integer(idx)
updated = List.delete_at(existing, idx)
apply_op_and_persist(socket, %{
"type" => "update_element",
"id" => id,
"patch" => %{"links" => updated}
})
end
end
def handle_event("delete_selected", _, socket) do
selection = socket.assigns.selection
if selection == [] do
{:noreply, socket}
else
socket = assign(socket, :selection, [])
socket =
Enum.reduce(selection, socket, fn
{:element, id}, socket ->
{_, s} = apply_op_and_persist(socket, %{"type" => "delete_element", "id" => id})
s
{:connector, id}, socket ->
{_, s} = apply_op_and_persist(socket, %{"type" => "delete_connector", "id" => id})
s
end)
{:noreply, socket}
end
end
defp apply_op_and_persist(%{assigns: %{read_only: true}} = socket, _op) do
{:noreply, put_flash(socket, :error, "You only have view access to this canvas.")}
end
defp apply_op_and_persist(socket, op) do
case Authority.apply_op(
socket.assigns.canvas.id,
socket.assigns.current_scope,
op,
socket.assigns.actor_ref
) do
{:ok, %{document: doc, version: version}} ->
{:noreply, assign(socket, document: doc, version: version)}
{:error, :forbidden} ->
{:noreply, put_flash(socket, :error, "You don't have permission to edit this canvas.")}
{:error, reason} when is_atom(reason) ->
{:noreply, put_flash(socket, :error, "Op rejected: #{reason}")}
end
end
defp apply_clipboard_defaults(
%{"type" => "insert_element", "element" => element} = op,
{:element, %{} = style}
)
when map_size(style) > 0 do
existing = Map.get(element, "style", %{})
%{op | "element" => Map.put(element, "style", Map.merge(style, existing))}
end
defp apply_clipboard_defaults(
%{"type" => "insert_connector", "connector" => connector} = op,
{:connector, %{} = style}
)
when map_size(style) > 0 do
%{op | "connector" => Map.merge(connector, style)}
end
defp apply_clipboard_defaults(op, _), do: op
defp do_select(socket, item, true) do
selection = socket.assigns.selection
selection =
if item in selection,
do: List.delete(selection, item),
else: selection ++ [item]
assign(socket, :selection, selection)
end
defp do_select(socket, item, _multi), do: assign(socket, :selection, [item])
defp reorder(order, id, action) do
case Enum.find_index(order, &(&1 == id)) do
nil -> order
idx -> do_reorder(order, idx, action)
end
end
defp do_reorder(order, idx, "to_back") do
{value, rest} = List.pop_at(order, idx)
[value | rest]
end
defp do_reorder(order, idx, "to_front") do
{value, rest} = List.pop_at(order, idx)
rest ++ [value]
end
defp do_reorder(order, idx, "backward") when idx > 0 do
a = Enum.at(order, idx)
b = Enum.at(order, idx - 1)
order |> List.replace_at(idx, b) |> List.replace_at(idx - 1, a)
end
defp do_reorder(order, idx, "forward") when idx < length(order) - 1 do
a = Enum.at(order, idx)
b = Enum.at(order, idx + 1)
order |> List.replace_at(idx, b) |> List.replace_at(idx + 1, a)
end
defp do_reorder(order, _, _), do: order
defp refresh_peers(socket) do
exclude = if socket.assigns.show_embed_cursors, do: [], else: ["embed"]
peers =
CanvasPresence.list_peers(socket.assigns.topic, socket.assigns.presence_key,
exclude_sources: exclude
)
locked = CanvasPresence.locked_elements(socket.assigns.topic, socket.assigns.presence_key)
assign(socket, peers: peers, locked_elements: locked)
end
## Form coercion ----------------------------------------------------------
@element_numeric_keys ~w(x y w h cx cy r)
@connector_numeric_keys ~w(start_gap end_gap stroke_width)
@style_color_keys ~w(fill stroke label_color)
@style_select_keys ~w(font_family dash label_position label_size label_font_family)
@style_number_keys ~w(font_size stroke_width)
@style_bool_keys ~w(shadow font_bold font_italic label_bold label_italic)
defp coerce_element_patch(props, _existing) when is_map(props) do
base =
props
|> Map.take(["label" | @element_numeric_keys])
|> Enum.reduce(%{}, fn {k, v}, acc ->
cond do
k == "label" -> Map.put(acc, k, v || "")
v in [nil, ""] -> acc
true -> Map.put(acc, k, parse_number(v))
end
end)
style =
%{}
|> merge_string_styles(props, @style_color_keys ++ @style_select_keys)
|> merge_number_styles(props, @style_number_keys)
|> merge_bool_styles(props, @style_bool_keys)
base = if map_size(style) > 0, do: Map.put(base, "style", style), else: base
case Map.get(props, "links") do
%{} = links_params ->
Map.put(base, "links", coerce_links_patch(links_params))
[_ | _] = list when is_list(list) ->
Map.put(base, "links", Enum.map(list, &coerce_link_patch/1))
_ ->
base
end
end
defp coerce_links_patch(map) when is_map(map) do
map
|> Enum.sort_by(fn {k, _} -> integer_or_zero(k) end)
|> Enum.map(fn {_, link_params} -> coerce_link_patch(link_params) end)
end
defp integer_or_zero(k) when is_binary(k) do
case Integer.parse(k) do
{n, _} -> n
:error -> 0
end
end
defp integer_or_zero(k) when is_integer(k), do: k
defp integer_or_zero(_), do: 0
defp coerce_link_patch(link_params) when is_map(link_params) do
Map.take(link_params, ~w(enabled kind target icon))
|> Enum.reduce(%{}, fn
{"enabled", v}, acc -> Map.put(acc, "enabled", parse_bool(v))
{k, v}, acc -> Map.put(acc, k, v)
end)
|> Map.put_new("enabled", false)
|> Map.put_new("kind", "external")
|> Map.put_new("target", "")
|> Map.put_new("icon", "link")
end
defp merge_string_styles(acc, props, keys) do
Enum.reduce(keys, acc, fn key, acc ->
case Map.get(props, key) do
v when v in [nil, ""] -> acc
v -> Map.put(acc, key, v)
end
end)
end
defp merge_number_styles(acc, props, keys) do
Enum.reduce(keys, acc, fn key, acc ->
case Map.get(props, key) do
v when v in [nil, ""] -> acc
v -> Map.put(acc, key, parse_number(v))
end
end)
end
defp merge_bool_styles(acc, props, keys) do
Enum.reduce(keys, acc, fn key, acc ->
case Map.fetch(props, key) do
:error -> acc
{:ok, v} -> Map.put(acc, key, parse_bool(v))
end
end)
end
defp parse_bool(true), do: true
defp parse_bool("true"), do: true
defp parse_bool("on"), do: true
defp parse_bool(_), do: false
defp coerce_connector_patch(props) when is_map(props) do
base = Map.take(props, ["label", "routing", "dash", "marker_start", "marker_end", "color"])
numeric =
props
|> Map.take(@connector_numeric_keys)
|> Enum.reject(fn {_, v} -> v in [nil, ""] end)
|> Map.new(fn {k, v} -> {k, parse_number(v)} end)
Map.merge(base, numeric)
end
defp parse_number(n) when is_number(n), do: n
defp parse_number(s) when is_binary(s) do
case Float.parse(s) do
{f, ""} -> if f == trunc(f), do: trunc(f), else: f
_ -> 0
end
end
## ── Helpers ──────────────────────────────────────────────────────────────
defp ensure_document_shape(nil), do: Document.new()
defp ensure_document_shape(%{"elements" => _, "order" => _, "connectors" => _} = doc), do: doc
defp ensure_document_shape(other) when is_map(other) do
%{
"elements" => other["elements"] || %{},
"order" => other["order"] || [],
"connectors" => other["connectors"] || %{}
}
end
defp connector_render_data(connectors, document) do
connectors
|> Enum.map(fn {id, connector} ->
{id, connector, ConnectorGeometry.render(connector, document)}
end)
|> Enum.reject(fn {_id, _c, rendered} -> is_nil(rendered) end)
end
defp marker_id("none"), do: ""
defp marker_id(name), do: "url(#dx-marker-#{name})"
defp element_data_attrs(%{"type" => "circle"} = e),
do: %{"data-cx" => e["cx"], "data-cy" => e["cy"], "data-r" => e["r"]}
defp element_data_attrs(%{"x" => x, "y" => y, "w" => w, "h" => h}),
do: %{"data-x" => x, "data-y" => y, "data-w" => w, "data-h" => h}
defp selection_focus([{:element, id}]), do: {:element, id}
defp selection_focus([{:connector, id}]), do: {:connector, id}
defp selection_focus(_), do: nil
defp selection_element_ids(selection),
do: for({:element, id} <- selection, do: id)
defp selection_connector_ids(selection),
do: for({:connector, id} <- selection, do: id)
defp selection_includes_element?(selection, id), do: {:element, id} in selection
defp selection_includes_connector?(selection, id), do: {:connector, id} in selection
# Compatibility helpers used in the SVG render loop and the resize handle.
defp selected_element_id(selection) do
case selection_focus(selection) do
{:element, id} -> id
_ -> nil
end
end
defp selected_element(%{"elements" => elements}, selection) do
case selection_focus(selection) do
{:element, id} -> elements[id]
_ -> nil
end
end
defp selected_element(_, _), do: nil
defp selected_connector(%{"connectors" => connectors}, selection) do
case selection_focus(selection) do
{:connector, id} -> connectors[id]
_ -> nil
end
end
defp selected_connector(_, _), do: nil
defp offset_and_remint(element, id_map, offset) do
new_id = Map.fetch!(id_map, element["id"])
element
|> Map.put("id", new_id)
|> shift_geometry(offset)
end
defp shift_geometry(%{"type" => "circle"} = e, offset),
do: %{e | "cx" => e["cx"] + offset, "cy" => e["cy"] + offset}
defp shift_geometry(e, offset),
do: %{e | "x" => e["x"] + offset, "y" => e["y"] + offset}
defp remap_connector(connector, id_map) do
new_id = Diogramos.ULID.generate()
from_id = id_map[connector["from"]["element"]] || connector["from"]["element"]
to_id = id_map[connector["to"]["element"]] || connector["to"]["element"]
connector
|> Map.put("id", new_id)
|> put_in(["from", "element"], from_id)
|> put_in(["to", "element"], to_id)
end
## ── Render ───────────────────────────────────────────────────────────────
@impl true
def render(assigns) do
assigns =
assign(
assigns,
:rendered_connectors,
connector_render_data(assigns.document["connectors"], assigns.document)
)
~H"""
<Layouts.app flash={@flash} current_scope={@current_scope} wide>
<div
id="canvas-edit"
data-theme={@canvas.theme}
data-canvas-id={@canvas.id}
data-read-only={to_string(@read_only)}
class="grid grid-cols-[4rem_1fr_18rem] grid-rows-[3rem_1fr] h-[calc(100vh-4rem)] gap-0 w-full"
>
<header class="col-span-3 flex items-center justify-between border-b border-base-300 px-3">
<div class="flex items-center gap-3">
<.link navigate={~p"/canvases"} class="btn btn-ghost btn-xs">
<.icon name="hero-arrow-left-micro" class="size-4" />
</.link>
<span class="font-semibold truncate">{@canvas.title}</span>
<span class="text-xs font-mono text-accent">{@canvas.slug}</span>
<%= if @read_only do %>
<span class="badge badge-warning badge-sm">view only</span>
<% end %>
</div>
<div class="flex items-center gap-2 text-xs">
<span class="opacity-70">role: {@role || "—"}</span>
<span class="opacity-70">v{@version}</span>
<button
type="button"
id="btn-toggle-grid"
phx-click="toggle_grid"
class={["btn btn-ghost btn-xs", @snap_grid && "text-accent"]}
title="Snap to grid"
>
<.icon name="hero-squares-2x2-micro" class="size-4" />
{if @snap_grid, do: "Grid on", else: "Grid"}
</button>
<button
type="button"
id="btn-toggle-embed-cursors"
phx-click="toggle_embed_cursors"
class={["btn btn-ghost btn-xs", @show_embed_cursors && "text-accent"]}
title={
if @show_embed_cursors,
do: "Hide cursors of embed viewers",
else: "Show cursors of embed viewers"
}
>
<.icon
name={if @show_embed_cursors, do: "hero-eye-micro", else: "hero-eye-slash-micro"}
class="size-4"
/> Viewers
</button>
<a
id="btn-export-json"
href={~p"/c/#{@canvas.slug}/export.json"}
download={"#{@canvas.slug}.json"}
class="btn btn-ghost btn-xs"
title="Download canvas as JSON"
>
<.icon name="hero-arrow-down-tray-micro" class="size-4" /> JSON
</a>
<button
type="button"
id="btn-export-mermaid"
phx-click="show_mermaid"
class="btn btn-ghost btn-xs"
>
<.icon name="hero-arrow-down-tray-micro" class="size-4" /> Mermaid
</button>
<%= if @role == "owner" do %>
<%= if @canvas.embed_token do %>
<div class="flex items-center gap-1">
<a
id="embed-link"
href={"/embed/" <> @canvas.embed_token}
target="_blank"
rel="noopener"
class="btn btn-ghost btn-xs text-accent gap-1 font-mono"
title="Open embed in a new tab"
>
<.icon name="hero-link-micro" class="size-4" />
/embed/{String.slice(@canvas.embed_token, 0, 6)}…
</a>
<button
type="button"
id="btn-toggle-embed"
phx-click="toggle_embed"
class="btn btn-ghost btn-xs"
title="Disable embed"
>
<.icon name="hero-x-mark-micro" class="size-4" />
</button>
</div>
<% else %>
<button
type="button"
id="btn-toggle-embed"
phx-click="toggle_embed"
class="btn btn-ghost btn-xs"
title="Generate embed link"
>
<.icon name="hero-link-micro" class="size-4" /> Embed
</button>
<% end %>
<% end %>
</div>
</header>
<nav
class="flex flex-col gap-2 p-2 border-r border-base-300 bg-base-200"
aria-label="Tools"
>
<div
:for={tool <- ~w(select text rect rounded circle connector)}
class="tooltip tooltip-right"
data-tip={tool_label(tool) <> " · " <> tool_shortcut(tool)}
>
<button
type="button"
id={"tool-#{tool}"}
class={[
"btn btn-ghost btn-square btn-md w-full",
@tool == tool && "btn-active"
]}
phx-click="select_tool"
phx-value-tool={tool}
disabled={@read_only}
aria-label={tool_label(tool)}
>
<.icon name={tool_icon(tool)} class="size-6" />
</button>
</div>
<div class="tooltip tooltip-right mt-auto" data-tip="Fit camera to canvas">
<button
type="button"
id="tool-fit-camera"
phx-click={JS.dispatch("phx:fit-canvas", to: "#canvas-svg")}
class="btn btn-ghost btn-square btn-md w-full"
aria-label="Fit camera to canvas"
>
<.icon name="hero-arrows-pointing-in" class="size-6" />
</button>
</div>
</nav>
<main class="relative overflow-hidden bg-base-100">
<svg
id="canvas-svg"
phx-hook=".CanvasViewport"
data-tool={@tool}
data-canvas-id={@canvas.id}
data-selected-id={selected_element_id(@selection) || ""}
data-has-selection={to_string(@selection != [])}
data-read-only={to_string(@read_only)}
data-locked-ids={Enum.join(MapSet.to_list(@locked_elements), ",")}
data-snap-grid={to_string(@snap_grid)}
data-grid-size={@grid_size}
class="absolute inset-0 w-full h-full select-none"
xmlns="http://www.w3.org/2000/svg"
>
<defs>
<symbol id="dx-link-icon-link" viewBox="0 0 24 24">
<path
fill="none"
stroke="currentColor"
stroke-width="1.8"
stroke-linecap="round"
stroke-linejoin="round"
d="M13.19 8.688a4.5 4.5 0 0 1 1.242 7.244l-4.5 4.5a4.5 4.5 0 0 1-6.364-6.364l1.757-1.757m13.35-.622 1.757-1.757a4.5 4.5 0 0 0-6.364-6.364l-4.5 4.5a4.5 4.5 0 0 0 1.242 7.244"
/>
</symbol>
<symbol id="dx-link-icon-arrow-top-right-on-square" viewBox="0 0 24 24">
<path
fill="none"
stroke="currentColor"
stroke-width="1.8"
stroke-linecap="round"
stroke-linejoin="round"
d="M13.5 6H5.25A2.25 2.25 0 0 0 3 8.25v10.5A2.25 2.25 0 0 0 5.25 21h10.5A2.25 2.25 0 0 0 18 18.75V10.5m-10.5 6L21 3m0 0h-5.25M21 3v5.25"
/>
</symbol>
<symbol id="dx-link-icon-document-text" viewBox="0 0 24 24">
<path
fill="none"
stroke="currentColor"
stroke-width="1.8"
stroke-linecap="round"
stroke-linejoin="round"
d="M19.5 14.25v-2.625a3.375 3.375 0 0 0-3.375-3.375h-1.5A1.125 1.125 0 0 1 13.5 7.125v-1.5a3.375 3.375 0 0 0-3.375-3.375H8.25m0 12.75h7.5m-7.5 3H12M10.5 2.25H5.625c-.621 0-1.125.504-1.125 1.125v17.25c0 .621.504 1.125 1.125 1.125h12.75c.621 0 1.125-.504 1.125-1.125V11.25a9 9 0 0 0-9-9Z"
/>
</symbol>
<symbol id="dx-link-icon-bookmark" viewBox="0 0 24 24">
<path
fill="none"
stroke="currentColor"
stroke-width="1.8"
stroke-linecap="round"
stroke-linejoin="round"
d="M17.593 3.322c1.1.128 1.907 1.077 1.907 2.185V21L12 17.25 4.5 21V5.507c0-1.108.806-2.057 1.907-2.185a48.507 48.507 0 0 1 11.186 0Z"
/>
</symbol>
<symbol id="dx-link-icon-globe-alt" viewBox="0 0 24 24">
<path
fill="none"
stroke="currentColor"
stroke-width="1.8"
stroke-linecap="round"
stroke-linejoin="round"
d="M12 21a9.004 9.004 0 0 0 8.716-6.747M12 21a9.004 9.004 0 0 1-8.716-6.747M12 21c2.485 0 4.5-4.03 4.5-9S14.485 3 12 3m0 18c-2.485 0-4.5-4.03-4.5-9S9.515 3 12 3m0 0a8.997 8.997 0 0 1 7.843 4.582M12 3a8.997 8.997 0 0 0-7.843 4.582m15.686 0A11.953 11.953 0 0 1 12 10.5c-2.998 0-5.74-1.1-7.843-2.918m15.686 0A8.959 8.959 0 0 1 21 12c0 .778-.099 1.533-.284 2.253m0 0A17.919 17.919 0 0 1 12 16.5c-3.162 0-6.133-.815-8.716-2.247m0 0A9.015 9.015 0 0 1 3 12c0-1.605.42-3.113 1.157-4.418"
/>
</symbol>
<symbol id="dx-link-icon-information-circle" viewBox="0 0 24 24">
<path
fill="none"
stroke="currentColor"
stroke-width="1.8"
stroke-linecap="round"
stroke-linejoin="round"
d="M11.25 11.25l.041-.02a.75.75 0 0 1 1.063.852l-.708 2.836a.75.75 0 0 0 1.063.853l.041-.021M21 12a9 9 0 1 1-18 0 9 9 0 0 1 18 0Zm-9-3.75h.008v.008H12V8.25Z"
/>
</symbol>
<pattern
id="canvas-grid-pattern"
x="0"
y="0"
width={@grid_size}
height={@grid_size}
patternUnits="userSpaceOnUse"
>
<circle cx="0.5" cy="0.5" r="0.9" class="fill-base-content opacity-30" />
</pattern>
<marker
id="dx-marker-arrow"
viewBox="0 0 10 10"
refX="10"
refY="5"
markerWidth="8"
markerHeight="8"
orient="auto-start-reverse"
>
<path d="M 0 0 L 10 5 L 0 10" fill="none" stroke="currentColor" stroke-width="1.5" />
</marker>
<marker
id="dx-marker-filled-arrow"
viewBox="0 0 10 10"
refX="10"
refY="5"
markerWidth="8"
markerHeight="8"
orient="auto-start-reverse"
>
<path d="M 0 0 L 10 5 L 0 10 Z" fill="currentColor" />
</marker>
<marker
id="dx-marker-diamond"
viewBox="0 0 10 10"
refX="10"
refY="5"
markerWidth="10"
markerHeight="10"
orient="auto-start-reverse"
>
<path d="M 0 5 L 5 0 L 10 5 L 5 10 Z" fill="currentColor" />
</marker>
<marker
id="dx-marker-circle"
viewBox="0 0 10 10"
refX="10"
refY="5"
markerWidth="6"
markerHeight="6"
orient="auto"
>
<circle cx="5" cy="5" r="3" fill="currentColor" />
</marker>
</defs>
<g id="viewport" class="text-base-content">
<%= if @snap_grid do %>
<rect
x="-10000"
y="-10000"
width="20000"
height="20000"
fill="url(#canvas-grid-pattern)"
class="pointer-events-none"
/>
<% end %>
<g
:for={id <- @document["order"]}
id={"el-" <> id}
data-element-id={id}
data-element-type={@document["elements"][id]["type"]}
{element_data_attrs(@document["elements"][id])}
class={[
"cursor-move",
selection_includes_element?(@selection, id) && "outline outline-2 outline-accent",
MapSet.member?(@locked_elements, id) && "opacity-40 pointer-events-none"
]}
>
<.element_node element={@document["elements"][id]} />
<%= if @tool == "select" and selected_element_id(@selection) == id and not @read_only do %>
<.resize_handle element={@document["elements"][id]} element_id={id} />
<% end %>
</g>
<g
:for={{cid, connector, render} <- @rendered_connectors}
id={"con-" <> cid}
data-connector-id={cid}
class={[
"text-base-content cursor-pointer",
selection_includes_connector?(@selection, cid) && "text-accent"
]}
>
<path
d={render.d}
fill="none"
stroke="transparent"
stroke-width="14"
class="pointer-events-auto"
/>
<path
d={render.d}
fill="none"
style={"stroke: #{token_var(connector["color"] || "base-content")}; color: #{token_var(connector["color"] || "base-content")};"}
stroke-width={render.stroke_width}
stroke-dasharray={render.dash_array}
marker-start={marker_id(render.marker_start)}
marker-end={marker_id(render.marker_end)}
class="pointer-events-none"
/>
<%= if connector["label"] != "" do %>
<text class="text-xs fill-base-content opacity-80 pointer-events-none">
{connector["label"]}
</text>
<% end %>
</g>
<g id="canvas-preview" class="pointer-events-none text-accent" />
<g id="canvas-cursors" class="pointer-events-none">
<g
:for={peer <- @peers}
:if={peer.cursor}
id={"cur-" <> peer.key}
transform={"translate(#{peer.cursor.x} #{peer.cursor.y})"}
style={"color: #{peer.color}"}
>
<path
d="M 0 0 L 0 14 L 4 11 L 7 17 L 9 16 L 6 10 L 11 10 Z"
fill="currentColor"
stroke="black"
stroke-width="0.5"
/>
<text
x="14"
y="14"
class="text-xs fill-current"
style="paint-order: stroke; stroke: black; stroke-width: 2px;"
>
{peer.name}
</text>
</g>
</g>
</g>
<script :type={Phoenix.LiveView.ColocatedHook} name=".CanvasViewport">
const SVG_NS = "http://www.w3.org/2000/svg"
const ALPHABET = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
function ulid() {
const ts = BigInt(Date.now())
const rand = new Uint8Array(10)
crypto.getRandomValues(rand)
let bi = ts << 80n
for (let i = 0; i < 10; i++) {
bi |= BigInt(rand[i]) << BigInt((9 - i) * 8)
}
bi &= (1n << 130n) - 1n
let out = ""
for (let i = 25; i >= 0; i--) {
out += ALPHABET[Number((bi >> BigInt(i * 5)) & 31n)]
}
return out
}
const DRAG_THRESHOLD = 3 // px
const CURSOR_THROTTLE_MS = 33 // ~30 Hz
export default {
mounted() {
this.scale = 1
this.tx = 0
this.ty = 0
this.viewport = this.el.querySelector("#viewport")
this.preview = this.el.querySelector("#canvas-preview")
this.lastCursorAt = 0
this.applyTransform()
// Per-canvas grid preference, stored in localStorage.
this.gridStorageKey = `dx-grid:${this.el.dataset.canvasId || "default"}`
this.handleEvent("grid_changed", ({on}) => {
try { localStorage.setItem(this.gridStorageKey, on ? "true" : "false") } catch (_) {}
})
let stored = null
try { stored = localStorage.getItem(this.gridStorageKey) } catch (_) {}
if (stored !== null) {
const want = stored === "true"
if ((this.el.dataset.snapGrid === "true") !== want) {
this.pushEvent("set_grid", { on: want })
}
}
this.onWheelBound = (e) => this.onWheel(e)
this.onPointerDownBound = (e) => this.onPointerDown(e)
this.onMove = (e) => this.onPointerMove(e)
this.onUp = (e) => this.onPointerUp(e)
this.onSvgMove = (e) => this.onSvgPointerMove(e)
this.onKey = (e) => this.onKeyDown(e)
this.onFitCanvas = () => this.fitCamera()
this.el.addEventListener("wheel", this.onWheelBound, { passive: false })
this.el.addEventListener("pointerdown", this.onPointerDownBound)
this.el.addEventListener("pointermove", this.onSvgMove)
this.el.addEventListener("phx:fit-canvas", this.onFitCanvas)
window.addEventListener("pointermove", this.onMove)
window.addEventListener("pointerup", this.onUp)
window.addEventListener("keydown", this.onKey)
},
destroyed() {
this.el.removeEventListener("wheel", this.onWheelBound)
this.el.removeEventListener("pointerdown", this.onPointerDownBound)
this.el.removeEventListener("pointermove", this.onSvgMove)
this.el.removeEventListener("phx:fit-canvas", this.onFitCanvas)
window.removeEventListener("pointermove", this.onMove)
window.removeEventListener("pointerup", this.onUp)
window.removeEventListener("keydown", this.onKey)
},
fitCamera() {
const elements = this.viewport.querySelectorAll("[data-element-id]")
if (elements.length === 0) {
this.tx = 0; this.ty = 0; this.scale = 1
this.applyTransform()
return
}
let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity
elements.forEach(g => {
let bx, by, bw, bh
if (g.dataset.elementType === "circle") {
const cx = parseFloat(g.dataset.cx)
const cy = parseFloat(g.dataset.cy)
const r = parseFloat(g.dataset.r)
bx = cx - r; by = cy - r; bw = 2 * r; bh = 2 * r
} else {
bx = parseFloat(g.dataset.x); by = parseFloat(g.dataset.y)
bw = parseFloat(g.dataset.w); bh = parseFloat(g.dataset.h)
}
if (!isFinite(bx) || !isFinite(by) || !isFinite(bw) || !isFinite(bh)) return
minX = Math.min(minX, bx)
minY = Math.min(minY, by)
maxX = Math.max(maxX, bx + bw)
maxY = Math.max(maxY, by + bh)
})
if (!isFinite(minX) || !isFinite(maxX)) return
const bw = maxX - minX
const bh = maxY - minY
if (bw <= 0 || bh <= 0) return
const rect = this.el.getBoundingClientRect()
const margin = 32
const sx = (rect.width - margin * 2) / bw
const sy = (rect.height - margin * 2) / bh
this.scale = Math.max(0.05, Math.min(2, Math.min(sx, sy)))
this.tx = -minX * this.scale + (rect.width - bw * this.scale) / 2
this.ty = -minY * this.scale + (rect.height - bh * this.scale) / 2
this.applyTransform()
},
onKeyDown(e) {
// Ignore shortcuts while typing in any input/textarea.
const t = e.target
const tag = t && t.tagName
if (tag === "INPUT" || tag === "TEXTAREA" || tag === "SELECT" || (t && t.isContentEditable)) return
if (e.key === "Escape") {
this.pushEvent("select_tool", { tool: "select" })
return
}
if (e.key === "Delete" || e.key === "Backspace") {
if (this.el.dataset.hasSelection === "true" && this.el.dataset.readOnly !== "true") {
e.preventDefault()
this.pushEvent("delete_selected", {})
}
return
}
if (e.key === "PageUp" || e.key === "PageDown") {
e.preventDefault()
const action = e.key === "PageUp"
? (e.shiftKey ? "to_front" : "forward")
: (e.shiftKey ? "to_back" : "backward")
this.pushEvent("z_order", { action })
return
}
if (!(e.ctrlKey || e.metaKey)) return
if (e.altKey) return
if (!e.shiftKey) {
if (e.key === "c" || e.key === "C") {
if (this.el.dataset.hasSelection === "true") {
e.preventDefault()
this.pushEvent("copy_selection", {})
}
return
}
if (e.key === "v" || e.key === "V") {
if (this.el.dataset.readOnly !== "true") {
e.preventDefault()
this.pushEvent("paste_selection", {})
}
return
}
}
if (e.shiftKey) return
const map = { "0": "select", "1": "text", "2": "rect", "3": "rounded", "4": "circle", "5": "connector" }
const tool = map[e.key]
if (!tool) return
e.preventDefault()
this.pushEvent("select_tool", { tool })
},
onSvgPointerMove(e) {
const now = performance.now()
if (now - this.lastCursorAt < CURSOR_THROTTLE_MS) return
this.lastCursorAt = now
const pt = this.worldPoint(e)
this.pushEvent("cursor", { x: pt.x, y: pt.y })
},
applyTransform() {
this.viewport.setAttribute(
"transform",
`translate(${this.tx} ${this.ty}) scale(${this.scale})`
)
},
worldPoint(e) {
const rect = this.el.getBoundingClientRect()
return {
x: (e.clientX - rect.left - this.tx) / this.scale,
y: (e.clientY - rect.top - this.ty) / this.scale
}
},
tool() { return this.el.dataset.tool || "select" },
readOnly() { return this.el.dataset.readOnly === "true" },
snapEnabled() { return this.el.dataset.snapGrid === "true" },
gridSize() { return parseFloat(this.el.dataset.gridSize) || 20 },
snap(v) {
if (!this.snapEnabled()) return v
const g = this.gridSize()
return Math.round(v / g) * g
},
snapPoint(p) {
return { x: this.snap(p.x), y: this.snap(p.y) }
},
onWheel(e) {
e.preventDefault()
const factor = e.deltaY < 0 ? 1.1 : 1 / 1.1
const rect = this.el.getBoundingClientRect()
const cx = e.clientX - rect.left
const cy = e.clientY - rect.top
const wx = (cx - this.tx) / this.scale
const wy = (cy - this.ty) / this.scale
this.scale = Math.max(0.1, Math.min(8, this.scale * factor))
this.tx = cx - wx * this.scale
this.ty = cy - wy * this.scale
this.applyTransform()
},
findElementGroup(target) {
let node = target
while (node && node !== this.el) {
if (node.dataset && node.dataset.elementId) return node
node = node.parentNode
}
return null
},
findResizeHandle(target) {
let node = target
while (node && node !== this.el) {
if (node.dataset && node.dataset.resizeHandle) return node
node = node.parentNode
}
return null
},
findConnectorGroup(target) {
let node = target
while (node && node !== this.el) {
if (node.dataset && node.dataset.connectorId) return node
node = node.parentNode
}
return null
},
elementCenter(group) {
if (group.dataset.elementType === "circle") {
return { x: parseFloat(group.dataset.cx), y: parseFloat(group.dataset.cy) }
}
return {
x: parseFloat(group.dataset.x) + parseFloat(group.dataset.w) / 2,
y: parseFloat(group.dataset.y) + parseFloat(group.dataset.h) / 2
}
},
onPointerDown(e) {
if (e.button !== 0 && e.button !== 1) return
// Middle-click or space-modified → pan
if (e.button === 1 || e.shiftKey) {
this.action = { kind: "pan", lastX: e.clientX, lastY: e.clientY }
return
}
const tool = this.tool()
const group = this.findElementGroup(e.target)
if (tool === "select") {
const handle = this.findResizeHandle(e.target)
if (handle && group) {
this.action = {
kind: "resize",
group,
elementId: group.dataset.elementId,
type: group.dataset.elementType,
startWorld: this.worldPoint(e),
startClient: { x: e.clientX, y: e.clientY }
}
return
}
if (group) {
this.pushEvent("select_element", {
id: group.dataset.elementId,
multi: e.ctrlKey || e.metaKey
})
this.pushEvent("set_lock", { id: group.dataset.elementId })
this.action = {
kind: "move",
group,
elementId: group.dataset.elementId,
type: group.dataset.elementType,
startWorld: this.worldPoint(e),
startClient: { x: e.clientX, y: e.clientY },
moved: false
}
return
}
const conGroup = this.findConnectorGroup(e.target)
if (conGroup) {
this.pushEvent("select_connector", {
id: conGroup.dataset.connectorId,
multi: e.ctrlKey || e.metaKey
})
return
}
// Empty area drag → lasso. Empty click without movement → clear selection.
const start = this.worldPoint(e)
this.action = {
kind: "lasso",
start,
current: start,
startClient: { x: e.clientX, y: e.clientY }
}
this.renderLassoPreview()
return
}
if (this.readOnly()) return
if (tool === "connector") {
if (!group) return
const center = this.elementCenter(group)
this.action = {
kind: "connect",
fromId: group.dataset.elementId,
fromCenter: center,
current: this.worldPoint(e)
}
this.renderConnectorPreview()
return
}
// Drawing tools
if (["rect", "rounded", "circle", "text"].includes(tool)) {
const start = this.worldPoint(e)
this.action = { kind: "draw", tool, start, current: start }
this.renderPreview()
}
},
onPointerMove(e) {
if (!this.action) return
const a = this.action
if (a.kind === "pan") {
this.tx += e.clientX - a.lastX
this.ty += e.clientY - a.lastY
a.lastX = e.clientX
a.lastY = e.clientY
this.applyTransform()
return
}
if (a.kind === "draw") {
a.current = this.worldPoint(e)
this.renderPreview()
return
}
if (a.kind === "connect") {
a.current = this.worldPoint(e)
this.renderConnectorPreview()
return
}
if (a.kind === "lasso") {
a.current = this.worldPoint(e)
this.renderLassoPreview()
return
}
if (a.kind === "move") {
const dx = e.clientX - a.startClient.x
const dy = e.clientY - a.startClient.y
if (!a.moved && Math.hypot(dx, dy) > DRAG_THRESHOLD) {
a.moved = true
}
if (a.moved) {
a.group.setAttribute(
"transform",
`translate(${dx / this.scale} ${dy / this.scale})`
)
}
return
}
if (a.kind === "resize") {
// Live preview: stretch the group via SVG transform from
// the top-left (or center for circles), then reset on drop.
const ds = this.el.dataset
const w0 = parseFloat(a.group.dataset.w)
const h0 = parseFloat(a.group.dataset.h)
const dx = (e.clientX - a.startClient.x) / this.scale
const dy = (e.clientY - a.startClient.y) / this.scale
if (a.type === "circle") {
const r0 = parseFloat(a.group.dataset.r)
const newR = Math.max(4, r0 + Math.max(dx, dy))
const sf = newR / r0
const cx = parseFloat(a.group.dataset.cx)
const cy = parseFloat(a.group.dataset.cy)
a.group.setAttribute(
"transform",
`translate(${cx} ${cy}) scale(${sf}) translate(${-cx} ${-cy})`
)
} else {
const newW = Math.max(8, w0 + dx)
const newH = Math.max(8, h0 + dy)
const sx = newW / w0
const sy = newH / h0
const x0 = parseFloat(a.group.dataset.x)
const y0 = parseFloat(a.group.dataset.y)
a.group.setAttribute(
"transform",
`translate(${x0} ${y0}) scale(${sx} ${sy}) translate(${-x0} ${-y0})`
)
}
}
},
onPointerUp(e) {
const a = this.action
this.action = null
if (!a) return
if (a.kind === "pan") return
if (a.kind === "lasso") {
this.preview.replaceChildren()
const dx = e.clientX - a.startClient.x
const dy = e.clientY - a.startClient.y
if (Math.hypot(dx, dy) < DRAG_THRESHOLD) {
this.pushEvent("clear_selection", {})
return
}
this.commitLasso(a)
return
}
if (a.kind === "draw") {
this.preview.replaceChildren()
this.commitDraw(a)
return
}
if (a.kind === "connect") {
this.preview.replaceChildren()
const targetGroup = this.findElementGroup(e.target)
if (targetGroup && targetGroup.dataset.elementId !== a.fromId) {
const id = ulid()
this.pushEvent("apply_op", {
op: {
type: "insert_connector",
connector: {
id,
from: { element: a.fromId, anchor: "auto", _other: targetGroup.dataset.elementId },
to: { element: targetGroup.dataset.elementId, anchor: "auto", _other: a.fromId },
routing: "orthogonal",
dash: "solid",
marker_start: "none",
marker_end: "arrow",
start_gap: 6,
end_gap: 6,
stroke_width: 2
}
}
})
}
return
}
if (a.kind === "resize") {
a.group.removeAttribute("transform")
const dx = (e.clientX - a.startClient.x) / this.scale
const dy = (e.clientY - a.startClient.y) / this.scale
let patch
if (a.type === "circle") {
const r0 = parseFloat(a.group.dataset.r)
const newR = Math.max(4, this.snap(r0 + Math.max(dx, dy)))
patch = { r: newR }
} else {
const w0 = parseFloat(a.group.dataset.w)
const h0 = parseFloat(a.group.dataset.h)
patch = {
w: Math.max(8, this.snap(w0 + dx)),
h: Math.max(8, this.snap(h0 + dy))
}
}
this.pushEvent("apply_op", {
op: { type: "update_element", id: a.elementId, patch }
})
return
}
if (a.kind === "move") {
this.pushEvent("clear_lock", {})
if (!a.moved) {
this.pushEvent("select_element", { id: a.elementId })
return
}
a.group.removeAttribute("transform")
const dx = e.clientX - a.startClient.x
const dy = e.clientY - a.startClient.y
const wx = dx / this.scale
const wy = dy / this.scale
let patch
if (a.type === "circle") {
patch = {
cx: this.snap(parseFloat(a.group.dataset.cx) + wx),
cy: this.snap(parseFloat(a.group.dataset.cy) + wy)
}
} else {
patch = {
x: this.snap(parseFloat(a.group.dataset.x) + wx),
y: this.snap(parseFloat(a.group.dataset.y) + wy)
}
}
this.pushEvent("apply_op", {
op: { type: "update_element", id: a.elementId, patch }
})
}
},
renderPreview() {
const a = this.action
if (!a || a.kind !== "draw") return
this.preview.replaceChildren()
const el = this.shapePreviewElement(a)
if (el) this.preview.appendChild(el)
},
renderLassoPreview() {
const a = this.action
if (!a || a.kind !== "lasso") return
this.preview.replaceChildren()
const x1 = Math.min(a.start.x, a.current.x)
const y1 = Math.min(a.start.y, a.current.y)
const w = Math.abs(a.current.x - a.start.x)
const h = Math.abs(a.current.y - a.start.y)
if (w < 1 && h < 1) return
const rect = document.createElementNS(SVG_NS, "rect")
rect.setAttribute("x", x1); rect.setAttribute("y", y1)
rect.setAttribute("width", w); rect.setAttribute("height", h)
rect.setAttribute("fill", "currentColor")
rect.setAttribute("fill-opacity", "0.08")
rect.setAttribute("stroke", "currentColor")
rect.setAttribute("stroke-dasharray", "4 3")
this.preview.appendChild(rect)
},
commitLasso(a) {
const x1 = Math.min(a.start.x, a.current.x)
const y1 = Math.min(a.start.y, a.current.y)
const x2 = Math.max(a.start.x, a.current.x)
const y2 = Math.max(a.start.y, a.current.y)
const elementIds = []
this.viewport.querySelectorAll("[data-element-id]").forEach(g => {
const id = g.dataset.elementId
if (!id) return
let bx, by, bw, bh
if (g.dataset.elementType === "circle") {
const cx = parseFloat(g.dataset.cx)
const cy = parseFloat(g.dataset.cy)
const r = parseFloat(g.dataset.r)
bx = cx - r; by = cy - r; bw = 2 * r; bh = 2 * r
} else {
bx = parseFloat(g.dataset.x); by = parseFloat(g.dataset.y)
bw = parseFloat(g.dataset.w); bh = parseFloat(g.dataset.h)
}
if (bx < x2 && bx + bw > x1 && by < y2 && by + bh > y1) {
elementIds.push(id)
}
})
// Auto-include connectors whose endpoints are both inside the
// lasso so copy/paste gets the wires too.
const elSet = new Set(elementIds)
const connectorIds = []
this.viewport.querySelectorAll("[data-connector-id]").forEach(g => {
const id = g.dataset.connectorId
const path = g.querySelector("path")
if (path) {
try {
const bb = path.getBBox()
if (bb.x < x2 && bb.x + bb.width > x1 && bb.y < y2 && bb.y + bb.height > y1) {
connectorIds.push(id)
}
} catch (_) {}
}
})
this.pushEvent("select_set", { elements: elementIds, connectors: connectorIds })
},
renderConnectorPreview() {
const a = this.action
if (!a || a.kind !== "connect") return
this.preview.replaceChildren()
const line = document.createElementNS(SVG_NS, "line")
line.setAttribute("x1", a.fromCenter.x)
line.setAttribute("y1", a.fromCenter.y)
line.setAttribute("x2", a.current.x)
line.setAttribute("y2", a.current.y)
line.setAttribute("stroke", "currentColor")
line.setAttribute("stroke-dasharray", "4 3")
this.preview.appendChild(line)
},
shapePreviewElement(a) {
const x1 = Math.min(a.start.x, a.current.x)
const y1 = Math.min(a.start.y, a.current.y)
const w = Math.abs(a.current.x - a.start.x)
const h = Math.abs(a.current.y - a.start.y)
if (w < 1 && h < 1) return null
if (a.tool === "circle") {
const cx = (a.start.x + a.current.x) / 2
const cy = (a.start.y + a.current.y) / 2
const r = Math.max(w, h) / 2
const c = document.createElementNS(SVG_NS, "circle")
c.setAttribute("cx", cx); c.setAttribute("cy", cy); c.setAttribute("r", r)
c.setAttribute("fill", "none")
c.setAttribute("stroke", "currentColor")
c.setAttribute("stroke-dasharray", "4 3")
return c
}
const rect = document.createElementNS(SVG_NS, "rect")
rect.setAttribute("x", x1); rect.setAttribute("y", y1)
rect.setAttribute("width", w); rect.setAttribute("height", h)
if (a.tool === "rounded") { rect.setAttribute("rx", 8); rect.setAttribute("ry", 8) }
rect.setAttribute("fill", "none")
rect.setAttribute("stroke", "currentColor")
rect.setAttribute("stroke-dasharray", "4 3")
return rect
},
commitDraw(a) {
const start = this.snapPoint(a.start)
const current = this.snapPoint(a.current)
const x1 = Math.min(start.x, current.x)
const y1 = Math.min(start.y, current.y)
const w = Math.max(Math.abs(current.x - start.x), 8)
const h = Math.max(Math.abs(current.y - start.y), 8)
const id = ulid()
let element
if (a.tool === "circle") {
element = {
id, type: "circle",
cx: (start.x + current.x) / 2,
cy: (start.y + current.y) / 2,
r: Math.max(w, h) / 2,
label: ""
}
} else {
element = { id, type: a.tool, x: x1, y: y1, w, h, label: a.tool === "text" ? "Text" : "" }
}
this.pushEvent("apply_op", {
op: { type: "insert_element", element }
})
}
}
</script>
</svg>
</main>
<%= if @show_mermaid do %>
<div
class="modal modal-open"
id="mermaid-export-modal"
phx-window-keydown="close_mermaid"
phx-key="escape"
>
<div class="modal-box max-w-3xl">
<h3 class="font-bold text-lg mb-2">Mermaid export</h3>
<p class="text-sm opacity-70 mb-3">
Paste this into any Mermaid renderer (mermaid.live, GitHub markdown, etc.).
</p>
<pre
phx-no-curly-interpolation
class="bg-base-300 p-3 rounded-box text-sm overflow-auto whitespace-pre"
><code id="mermaid-source"><%= @mermaid_source %></code></pre>
<div class="modal-action">
<button type="button" phx-click="close_mermaid" class="btn btn-ghost">Close</button>
</div>
</div>
</div>
<% end %>
<aside
id="property-panel"
class="border-l border-base-300 bg-base-200 p-3 overflow-y-auto"
>
<div class="flex items-center justify-between mb-2 gap-2">
<h2 class="font-mono text-xs uppercase tracking-wide text-accent">Properties</h2>
<div class="flex items-center gap-1">
<%= if selection_focus(@selection) do %>
<button
type="button"
id="btn-copy-style"
phx-click="copy_style"
class="btn btn-ghost btn-xs"
title="Copy style"
>
<.icon name="hero-clipboard-micro" class="size-4" />
</button>
<button
type="button"
id="btn-paste-style"
phx-click="paste_style"
class="btn btn-ghost btn-xs"
disabled={
@read_only or
!style_clipboard_compatible?(@style_clipboard, selection_focus(@selection))
}
title="Paste style"
>
<.icon name="hero-clipboard-document-check-micro" class="size-4" />
</button>
<% end %>
<%= if @selection != [] do %>
<button
type="button"
id="btn-copy-selection"
phx-click="copy_selection"
class="btn btn-ghost btn-xs"
title="Copy selection (Ctrl-C)"
>
<.icon name="hero-document-duplicate-micro" class="size-4" />
</button>
<% end %>
<button
type="button"
id="btn-paste-selection"
phx-click="paste_selection"
class="btn btn-ghost btn-xs"
disabled={@read_only or @selection_clipboard == nil}
title="Paste selection (Ctrl-V)"
>
<.icon name="hero-clipboard-document-list-micro" class="size-4" />
</button>
</div>
</div>
<.style_clipboard_preview clipboard={@style_clipboard} />
<.property_panel
selection={@selection}
element={selected_element(@document, @selection)}
connector={selected_connector(@document, @selection)}
read_only={@read_only}
/>
</aside>
</div>
</Layouts.app>
"""
end
attr :element, :map, required: true
defp shape_label(%{element: element} = assigns) do
if (element["label"] || "") == "" do
~H""
else
assigns =
assigns
|> assign(:geom, label_geom(element))
|> assign(:text_style, shape_label_style(element))
~H"""
<text
x={@geom.x}
y={@geom.y}
text-anchor={@geom.text_anchor}
dominant-baseline={@geom.baseline}
style={@text_style}
>{@element["label"]}</text>
"""
end
end
@doc false
def shape_label_style(element) do
color = get_in(element, ["style", "label_color"]) || "base-content"
family = font_family_css(get_in(element, ["style", "label_font_family"]) || "sans")
size = label_size_px(get_in(element, ["style", "label_size"]) || "md")
weight = if get_in(element, ["style", "label_bold"]) == true, do: "700", else: "400"
style_part = if get_in(element, ["style", "label_italic"]) == true, do: "italic", else: "normal"
"fill: #{token_var(color)}; font-family: #{family}; font-size: #{size}px; font-weight: #{weight}; font-style: #{style_part};"
end
attr :element, :map, required: true
defp link_overlay(%{element: element} = assigns) do
enabled = enabled_links(element)
if enabled == [] do
~H""
else
assigns = assign(assigns, :placements, link_placements(element, enabled, :editor))
~H"""
<%= for %{link: link, x: x, y: y, size: size, href: href, icon: icon} <- @placements do %>
<a
href={href}
target={if link["kind"] == "external", do: "_blank", else: nil}
rel={if link["kind"] == "external", do: "noopener noreferrer", else: nil}
class="text-accent"
>
<rect
x={x - 1}
y={y - 1}
width={size + 2}
height={size + 2}
rx="3"
ry="3"
class="fill-base-100 stroke-accent"
stroke-width="1"
/>
<use href={"#" <> icon} x={x} y={y} width={size} height={size} />
</a>
<% end %>
"""
end
end
@doc false
def enabled_links(%{"links" => links}) when is_list(links),
do: Enum.filter(links, &(&1["enabled"] == true))
def enabled_links(_), do: []
@doc """
Returns one placement per enabled link, stacked horizontally from the
bottom-right corner of the element's bbox toward the left so the
"primary" (first) link is closest to the corner.
"""
def link_placements(element, enabled_links, context \\ :embed) do
{origin_x, origin_y, size} = link_overlay_geometry(element)
gap = 2
enabled_links
|> Enum.with_index()
|> Enum.map(fn {link, i} ->
%{
link: link,
href: link_href(link, context),
icon: link_icon_id(link["icon"]),
x: origin_x - i * (size + gap),
y: origin_y,
size: size
}
end)
end
@doc false
def link_overlay_geometry(%{"type" => "circle"} = e) do
smallest = 2 * (e["r"] || 0)
size = max(8, smallest * 0.08)
bbox_x = (e["cx"] || 0) - (e["r"] || 0)
bbox_y = (e["cy"] || 0) - (e["r"] || 0)
pad = 2
{bbox_x + smallest - size - pad, bbox_y + smallest - size - pad, size}
end
def link_overlay_geometry(%{"w" => w, "h" => h, "x" => x, "y" => y}) do
smallest = min(w, h)
size = max(8, smallest * 0.08)
pad = 2
{x + w - size - pad, y + h - size - pad, size}
end
def link_overlay_geometry(_), do: {0, 0, 0}
@doc false
def link_icon_id(name), do: "dx-link-icon-#{name || "link"}"
@doc false
def link_href(link, context \\ :embed)
def link_href(%{"kind" => "canvas", "target" => slug}, :editor)
when is_binary(slug) and slug != "",
do: "/c/#{slug}"
def link_href(%{"kind" => "canvas", "target" => slug}, _context)
when is_binary(slug) and slug != "",
do: "/c-embed/#{slug}"
def link_href(%{"target" => target}, _context) when is_binary(target), do: target
def link_href(_, _context), do: "#"
attr :element, :map, required: true
attr :element_id, :string, required: true
defp resize_handle(%{element: %{"type" => "circle"} = el} = assigns) do
handle_size = 10
cx = el["cx"] + el["r"]
cy = el["cy"] + el["r"]
assigns = assign(assigns, x: cx - handle_size / 2, y: cy - handle_size / 2, size: handle_size)
~H"""
<rect
x={@x}
y={@y}
width={@size}
height={@size}
class="fill-accent stroke-base-100 cursor-nwse-resize"
stroke-width="1"
data-resize-handle={@element_id}
pointer-events="all"
/>
"""
end
defp resize_handle(%{element: el} = assigns) do
handle_size = 10
assigns =
assign(assigns,
x: el["x"] + el["w"] - handle_size / 2,
y: el["y"] + el["h"] - handle_size / 2,
size: handle_size
)
~H"""
<rect
x={@x}
y={@y}
width={@size}
height={@size}
class="fill-accent stroke-base-100 cursor-nwse-resize"
stroke-width="1"
data-resize-handle={@element_id}
pointer-events="all"
/>
"""
end
attr :element, :map, required: true
defp element_node(%{element: %{"type" => "rect"}} = assigns) do
~H"""
<%= if shadow?(@element) do %>
<rect
x={@element["x"] + shadow_offset()}
y={@element["y"] + shadow_offset()}
width={@element["w"]}
height={@element["h"]}
style={shadow_style(@element)}
/>
<% end %>
<rect
x={@element["x"]}
y={@element["y"]}
width={@element["w"]}
height={@element["h"]}
style={shape_style(@element)}
pointer-events="visiblePainted"
/>
<.shape_label element={@element} />
<.link_overlay element={@element} />
"""
end
defp element_node(%{element: %{"type" => "rounded"}} = assigns) do
~H"""
<%= if shadow?(@element) do %>
<rect
x={@element["x"] + shadow_offset()}
y={@element["y"] + shadow_offset()}
width={@element["w"]}
height={@element["h"]}
rx="8"
ry="8"
style={shadow_style(@element)}
/>
<% end %>
<rect
x={@element["x"]}
y={@element["y"]}
width={@element["w"]}
height={@element["h"]}
rx="8"
ry="8"
style={shape_style(@element)}
pointer-events="visiblePainted"
/>
<.shape_label element={@element} />
<.link_overlay element={@element} />
"""
end
defp element_node(%{element: %{"type" => "circle"}} = assigns) do
~H"""
<%= if shadow?(@element) do %>
<circle
cx={@element["cx"] + shadow_offset()}
cy={@element["cy"] + shadow_offset()}
r={@element["r"]}
style={shadow_style(@element)}
/>
<% end %>
<circle
cx={@element["cx"]}
cy={@element["cy"]}
r={@element["r"]}
style={shape_style(@element)}
pointer-events="visiblePainted"
/>
<.shape_label element={@element} />
<.link_overlay element={@element} />
"""
end
defp element_node(%{element: %{"type" => "text"}} = assigns) do
~H"""
<text
x={@element["x"]}
y={@element["y"] + text_baseline(@element)}
style={text_element_style(@element)}
pointer-events="visiblePainted"
>
{@element["label"]}
</text>
<.link_overlay element={@element} />
"""
end
@doc false
def text_element_style(element) do
fill = get_in(element, ["style", "fill"]) || "base-content"
family = font_family_css(get_in(element, ["style", "font_family"]) || "sans")
size = get_in(element, ["style", "font_size"]) || 14
weight = if get_in(element, ["style", "font_bold"]) == true, do: "700", else: "400"
style = if get_in(element, ["style", "font_italic"]) == true, do: "italic", else: "normal"
"fill: #{token_var(fill)}; font-family: #{family}; font-size: #{size}px; font-weight: #{weight}; font-style: #{style};"
end
@doc false
def font_family_css("serif"), do: "ui-serif, Georgia, serif"
def font_family_css("mono"), do: "ui-monospace, SFMono-Regular, Menlo, monospace"
def font_family_css("b612"), do: "'B612', system-ui, sans-serif"
def font_family_css("b612-mono"),
do: "'B612 Mono', ui-monospace, SFMono-Regular, Menlo, monospace"
def font_family_css(_), do: "ui-sans-serif, system-ui, sans-serif"
@doc false
def text_baseline(element) do
size = get_in(element, ["style", "font_size"]) || 14
# Approximate ascender height so the top of the glyph aligns to y.
round(size * 0.85)
end
@doc """
Computes label placement attrs for a shape (rect/rounded/circle).
Returns `%{x, y, text_anchor, baseline, font_size}` driven by
`style.label_position` and `style.label_size`.
"""
def label_geom(element) do
{x, y, w, h} = bbox_of(element)
pos = get_in(element, ["style", "label_position"]) || default_label_position(element)
size = label_size_px(get_in(element, ["style", "label_size"]) || "md")
pad = 8
{ax, anchor} =
case pos do
p when p in ["tl", "ml", "bl"] -> {x + pad, "start"}
p when p in ["tc", "center", "bc"] -> {x + w / 2, "middle"}
p when p in ["tr", "mr", "br"] -> {x + w - pad, "end"}
_ -> {x + w / 2, "middle"}
end
{ay, baseline} =
case pos do
p when p in ["tl", "tc", "tr"] -> {y + pad, "hanging"}
p when p in ["ml", "center", "mr"] -> {y + h / 2, "middle"}
p when p in ["bl", "bc", "br"] -> {y + h - pad, "auto"}
_ -> {y + h / 2, "middle"}
end
%{x: ax, y: ay, text_anchor: anchor, baseline: baseline, font_size: size}
end
defp bbox_of(%{"type" => "circle", "cx" => cx, "cy" => cy, "r" => r}),
do: {cx - r, cy - r, 2 * r, 2 * r}
defp bbox_of(%{"x" => x, "y" => y, "w" => w, "h" => h}), do: {x, y, w, h}
defp default_label_position(%{"type" => "circle"}), do: "center"
defp default_label_position(_), do: "tl"
defp label_size_px("sm"), do: 11
defp label_size_px("md"), do: 14
defp label_size_px("lg"), do: 18
defp label_size_px("xl"), do: 24
defp label_size_px(_), do: 14
@doc false
def shape_style(element) do
fill = get_in(element, ["style", "fill"]) || "base-200"
stroke = get_in(element, ["style", "stroke"]) || "base-content"
width = get_in(element, ["style", "stroke_width"]) || 1.5
dash = shape_dash_array(get_in(element, ["style", "dash"]) || "solid")
base = "fill: #{token_var(fill)}; stroke: #{token_var(stroke)}; stroke-width: #{width};"
if dash, do: base <> " stroke-dasharray: #{dash};", else: base
end
defp shape_dash_array("solid"), do: nil
defp shape_dash_array("dotted"), do: "2 4"
defp shape_dash_array("dashed"), do: "8 6"
defp shape_dash_array("dash-dot"), do: "8 4 2 4"
defp shape_dash_array(_), do: nil
@doc false
def shadow_style(element) do
color =
get_in(element, ["style", "fill"]) || get_in(element, ["style", "stroke"]) || "base-content"
"fill: #{token_var(color)}; stroke: #{token_var(color)}; stroke-width: 1; opacity: 0.55;"
end
@doc false
def shadow?(element), do: get_in(element, ["style", "shadow"]) == true
@doc false
def shadow_offset, do: 12
@doc false
def token_var("transparent"), do: "transparent"
def token_var(token), do: "var(--color-#{token})"
defp tool_icon("select"), do: "hero-cursor-arrow-rays"
defp tool_icon("text"), do: "hero-language"
defp tool_icon("rect"), do: "hero-square-2-stack"
defp tool_icon("rounded"), do: "hero-stop"
defp tool_icon("circle"), do: "hero-circle-stack"
defp tool_icon("connector"), do: "hero-arrow-long-right"
defp tool_label("select"), do: "Select / move"
defp tool_label("text"), do: "Text"
defp tool_label("rect"), do: "Rectangle"
defp tool_label("rounded"), do: "Rounded rectangle"
defp tool_label("circle"), do: "Circle"
defp tool_label("connector"), do: "Connector"
defp tool_shortcut("select"), do: "Esc / Ctrl-0"
defp tool_shortcut("text"), do: "Ctrl-1"
defp tool_shortcut("rect"), do: "Ctrl-2"
defp tool_shortcut("rounded"), do: "Ctrl-3"
defp tool_shortcut("circle"), do: "Ctrl-4"
defp tool_shortcut("connector"), do: "Ctrl-5"
## ── Property panel ───────────────────────────────────────────────────────
attr :selection, :any, required: true
attr :element, :map, default: nil
attr :connector, :map, default: nil
attr :read_only, :boolean, default: false
defp property_panel(%{selection: []} = assigns) do
~H"""
<p class="text-sm opacity-70">
Click an element to edit it. Drag from empty canvas in select mode to lasso a group.
</p>
"""
end
defp property_panel(%{selection: selection} = assigns)
when length(selection) > 1 do
assigns =
assigns
|> assign(:n_elements, length(selection_element_ids(selection)))
|> assign(:n_connectors, length(selection_connector_ids(selection)))
~H"""
<div id="multi-selection-panel" class="flex flex-col gap-2">
<p class="text-sm">
Selected: <span class="font-mono">{@n_elements}</span>
elements, <span class="font-mono">{@n_connectors}</span>
connectors.
</p>
<button
type="button"
phx-click="delete_selected"
class="btn btn-error btn-sm"
disabled={@read_only}
>
<.icon name="hero-trash-micro" class="size-4" /> Delete all
</button>
</div>
"""
end
defp property_panel(%{selection: [{:element, _id}], element: nil} = assigns) do
~H"""
<p class="text-sm opacity-70">Selected element no longer exists.</p>
"""
end
defp property_panel(%{selection: [{:element, id}], element: element} = assigns) do
assigns =
assign(assigns, :id, id) |> assign(:form, to_form(element_form_params(element), as: :props))
~H"""
<div class="flex items-center justify-between mb-2">
<span class="font-mono text-xs">{@element["type"]}</span>
<button
type="button"
phx-click="delete_selected"
class="btn btn-ghost btn-xs text-error"
disabled={@read_only}
>
<.icon name="hero-trash-micro" class="size-4" />
</button>
</div>
<div class="flex items-center justify-between mb-2 text-xs">
<span class="opacity-60">Order</span>
<div class="join">
<div class="tooltip tooltip-bottom" data-tip="Send to back">
<button
type="button"
phx-click="z_order"
phx-value-action="to_back"
class="btn btn-ghost btn-xs join-item"
disabled={@read_only}
aria-label="Send to back"
>
<.icon name="hero-bars-arrow-down-micro" class="size-4" />
</button>
</div>
<div class="tooltip tooltip-bottom" data-tip="Send backward">
<button
type="button"
phx-click="z_order"
phx-value-action="backward"
class="btn btn-ghost btn-xs join-item"
disabled={@read_only}
aria-label="Send backward"
>
<.icon name="hero-arrow-down-micro" class="size-4" />
</button>
</div>
<div class="tooltip tooltip-bottom" data-tip="Bring forward">
<button
type="button"
phx-click="z_order"
phx-value-action="forward"
class="btn btn-ghost btn-xs join-item"
disabled={@read_only}
aria-label="Bring forward"
>
<.icon name="hero-arrow-up-micro" class="size-4" />
</button>
</div>
<div class="tooltip tooltip-bottom" data-tip="Bring to front">
<button
type="button"
phx-click="z_order"
phx-value-action="to_front"
class="btn btn-ghost btn-xs join-item"
disabled={@read_only}
aria-label="Bring to front"
>
<.icon name="hero-bars-arrow-up-micro" class="size-4" />
</button>
</div>
</div>
</div>
<.form
for={@form}
id={"el-form-" <> @id}
phx-change="update_selected"
phx-submit="update_selected"
class="flex flex-col gap-2"
>
<.input field={@form[:label]} type="text" label="Label" disabled={@read_only} />
<%= if @element["type"] == "circle" do %>
<div class="grid grid-cols-3 gap-2">
<.input field={@form[:cx]} type="number" label="cx" step="0.1" disabled={@read_only} />
<.input field={@form[:cy]} type="number" label="cy" step="0.1" disabled={@read_only} />
<.input field={@form[:r]} type="number" label="r" step="0.1" disabled={@read_only} />
</div>
<% else %>
<div class="grid grid-cols-2 gap-2">
<.input field={@form[:x]} type="number" label="x" step="0.1" disabled={@read_only} />
<.input field={@form[:y]} type="number" label="y" step="0.1" disabled={@read_only} />
<.input field={@form[:w]} type="number" label="w" step="0.1" disabled={@read_only} />
<.input field={@form[:h]} type="number" label="h" step="0.1" disabled={@read_only} />
</div>
<% end %>
<%= if @element["type"] != "text" do %>
<div class="grid grid-cols-2 gap-2">
<.input
field={@form[:fill]}
type="select"
label="Background"
options={Diogramos.Themes.color_tokens()}
disabled={@read_only}
/>
<.input
field={@form[:stroke]}
type="select"
label="Border"
options={Diogramos.Themes.color_tokens()}
disabled={@read_only}
/>
</div>
<div class="grid grid-cols-2 gap-2">
<.input
field={@form[:dash]}
type="select"
label="Border style"
options={["solid", "dotted", "dashed", "dash-dot"]}
disabled={@read_only}
/>
<.input
field={@form[:stroke_width]}
type="number"
label="Border width"
step="0.5"
min="0.5"
disabled={@read_only}
/>
</div>
<.input field={@form[:shadow]} type="checkbox" label="Shadow" disabled={@read_only} />
<div class="grid grid-cols-2 gap-2">
<.input
field={@form[:label_position]}
type="select"
label="Label position"
options={[
{"Top left", "tl"},
{"Top center", "tc"},
{"Top right", "tr"},
{"Middle left", "ml"},
{"Center", "center"},
{"Middle right", "mr"},
{"Bottom left", "bl"},
{"Bottom center", "bc"},
{"Bottom right", "br"}
]}
disabled={@read_only}
/>
<.input
field={@form[:label_size]}
type="select"
label="Label size"
options={[{"Small", "sm"}, {"Medium", "md"}, {"Large", "lg"}, {"X-large", "xl"}]}
disabled={@read_only}
/>
</div>
<div class="grid grid-cols-2 gap-2">
<.input
field={@form[:label_color]}
type="select"
label="Label color"
options={Diogramos.Themes.color_tokens()}
disabled={@read_only}
/>
<.input
field={@form[:label_font_family]}
type="select"
label="Label font"
options={[
{"Sans-serif", "sans"},
{"Serif", "serif"},
{"Monospace", "mono"},
{"B612", "b612"},
{"B612 Mono", "b612-mono"}
]}
disabled={@read_only}
/>
</div>
<div class="grid grid-cols-2 gap-2">
<.input
field={@form[:label_bold]}
type="checkbox"
label="Bold label"
disabled={@read_only}
/>
<.input
field={@form[:label_italic]}
type="checkbox"
label="Italic label"
disabled={@read_only}
/>
</div>
<% else %>
<.input
field={@form[:fill]}
type="select"
label="Color"
options={Diogramos.Themes.color_tokens()}
disabled={@read_only}
/>
<.input
field={@form[:font_family]}
type="select"
label="Font"
options={[
{"Sans-serif", "sans"},
{"Serif", "serif"},
{"Monospace", "mono"},
{"B612", "b612"},
{"B612 Mono", "b612-mono"}
]}
disabled={@read_only}
/>
<.input
field={@form[:font_size]}
type="number"
label="Size (px)"
min="4"
max="256"
step="1"
disabled={@read_only}
/>
<div class="grid grid-cols-2 gap-2">
<.input field={@form[:font_bold]} type="checkbox" label="Bold" disabled={@read_only} />
<.input field={@form[:font_italic]} type="checkbox" label="Italic" disabled={@read_only} />
</div>
<% end %>
<fieldset class="border-t border-base-300 pt-2 mt-2 flex flex-col gap-2">
<legend class="font-mono text-[10px] uppercase tracking-wider text-accent px-1 flex items-center gap-2">
<span>Links</span>
<button
type="button"
phx-click="add_link"
phx-value-element_id={@id}
class="btn btn-ghost btn-xs"
disabled={@read_only}
title="Add another link"
>
<.icon name="hero-plus-micro" class="size-3" /> Add
</button>
</legend>
<%= for {link, idx} <- Enum.with_index(Map.get(@form.params, "links", [])) do %>
<.link_form_row
link={link}
index={idx}
element_id={@id}
read_only={@read_only}
/>
<% end %>
</fieldset>
</.form>
"""
end
defp property_panel(%{selection: [{:connector, _id}], connector: nil} = assigns) do
~H"""
<p class="text-sm opacity-70">Selected connector no longer exists.</p>
"""
end
defp property_panel(%{selection: [{:connector, id}], connector: connector} = assigns) do
assigns =
assigns
|> assign(:id, id)
|> assign(:form, to_form(connector_form_params(connector), as: :props))
~H"""
<div class="flex items-center justify-between mb-2">
<span class="font-mono text-xs">connector</span>
<button
type="button"
phx-click="delete_selected"
class="btn btn-ghost btn-xs text-error"
disabled={@read_only}
>
<.icon name="hero-trash-micro" class="size-4" />
</button>
</div>
<.form
for={@form}
id={"con-form-" <> @id}
phx-change="update_selected"
phx-submit="update_selected"
class="flex flex-col gap-2"
>
<.input field={@form[:label]} type="text" label="Label" disabled={@read_only} />
<.input
field={@form[:routing]}
type="select"
label="Routing"
options={["straight", "orthogonal", "curve"]}
disabled={@read_only}
/>
<.input
field={@form[:dash]}
type="select"
label="Tick pattern"
options={["solid", "dotted", "dashed", "dash-dot"]}
disabled={@read_only}
/>
<.input
field={@form[:color]}
type="select"
label="Color"
options={Diogramos.Themes.color_tokens()}
disabled={@read_only}
/>
<div class="grid grid-cols-2 gap-2">
<.input
field={@form[:marker_start]}
type="select"
label="Start"
options={["none", "arrow", "filled-arrow", "diamond", "circle"]}
disabled={@read_only}
/>
<.input
field={@form[:marker_end]}
type="select"
label="End"
options={["none", "arrow", "filled-arrow", "diamond", "circle"]}
disabled={@read_only}
/>
</div>
<div class="grid grid-cols-3 gap-2">
<.input
field={@form[:start_gap]}
type="number"
label="Start gap"
step="0.5"
min="0"
disabled={@read_only}
/>
<.input
field={@form[:end_gap]}
type="number"
label="End gap"
step="0.5"
min="0"
disabled={@read_only}
/>
<.input
field={@form[:stroke_width]}
type="number"
label="Width"
step="0.5"
min="0.5"
disabled={@read_only}
/>
</div>
</.form>
"""
end
defp element_form_params(%{"type" => "circle"} = e) do
%{
"label" => e["label"] || "",
"cx" => e["cx"],
"cy" => e["cy"],
"r" => e["r"]
}
|> with_style_fields(e)
end
defp element_form_params(e) do
%{
"label" => e["label"] || "",
"x" => e["x"],
"y" => e["y"],
"w" => e["w"],
"h" => e["h"]
}
|> with_style_fields(e)
end
defp with_style_fields(params, %{"type" => "text"} = e) do
params
|> Map.put("fill", get_in(e, ["style", "fill"]) || "base-content")
|> Map.put("font_family", get_in(e, ["style", "font_family"]) || "sans")
|> Map.put("font_size", get_in(e, ["style", "font_size"]) || 14)
|> Map.put("font_bold", get_in(e, ["style", "font_bold"]) == true)
|> Map.put("font_italic", get_in(e, ["style", "font_italic"]) == true)
|> with_link_fields(e)
end
defp with_style_fields(params, e) do
params
|> Map.put("fill", get_in(e, ["style", "fill"]) || "base-200")
|> Map.put("stroke", get_in(e, ["style", "stroke"]) || "base-content")
|> Map.put("dash", get_in(e, ["style", "dash"]) || "solid")
|> Map.put("stroke_width", get_in(e, ["style", "stroke_width"]) || 1.5)
|> Map.put("shadow", get_in(e, ["style", "shadow"]) == true)
|> Map.put(
"label_position",
get_in(e, ["style", "label_position"]) ||
if(e["type"] == "circle", do: "center", else: "tl")
)
|> Map.put("label_size", get_in(e, ["style", "label_size"]) || "md")
|> Map.put("label_color", get_in(e, ["style", "label_color"]) || "base-content")
|> Map.put("label_font_family", get_in(e, ["style", "label_font_family"]) || "sans")
|> Map.put("label_bold", get_in(e, ["style", "label_bold"]) == true)
|> Map.put("label_italic", get_in(e, ["style", "label_italic"]) == true)
|> with_link_fields(e)
end
defp with_link_fields(params, e) do
links =
case e["links"] do
list when is_list(list) -> list
_ -> []
end
Map.put(
params,
"links",
Enum.map(links, fn link ->
%{
"enabled" => link["enabled"] == true,
"kind" => link["kind"] || "external",
"target" => link["target"] || "",
"icon" => link["icon"] || "link"
}
end)
)
end
defp connector_form_params(c) do
%{
"label" => c["label"] || "",
"routing" => c["routing"] || "orthogonal",
"dash" => c["dash"] || "solid",
"marker_start" => c["marker_start"] || "none",
"marker_end" => c["marker_end"] || "arrow",
"start_gap" => c["start_gap"] || 6,
"end_gap" => c["end_gap"] || 6,
"stroke_width" => c["stroke_width"] || 2,
"color" => c["color"] || "base-content"
}
end
defp style_clipboard_compatible?(nil, _), do: false
defp style_clipboard_compatible?(_, nil), do: false
defp style_clipboard_compatible?({:element, _}, {:element, _}), do: true
defp style_clipboard_compatible?({:connector, _}, {:connector, _}), do: true
defp style_clipboard_compatible?(_, _), do: false
attr :link, :map, required: true
attr :index, :integer, required: true
attr :element_id, :string, required: true
attr :read_only, :boolean, default: false
defp link_form_row(assigns) do
base = "props[links][#{assigns.index}]"
assigns =
assigns
|> assign(:base, base)
|> assign(:icon_options, [
{"Link", "link"},
{"Open in new tab", "arrow-top-right-on-square"},
{"Document", "document-text"},
{"Bookmark", "bookmark"},
{"Globe", "globe-alt"},
{"Info", "information-circle"}
])
|> assign(:kind_options, [{"External URL", "external"}, {"Canvas slug", "canvas"}])
~H"""
<div class="border border-base-300 rounded-box p-2 flex flex-col gap-2">
<div class="flex items-center justify-between">
<span class="font-mono text-[10px] opacity-60">link {@index + 1}</span>
<button
type="button"
phx-click="remove_link"
phx-value-element_id={@element_id}
phx-value-index={@index}
class="btn btn-ghost btn-xs text-error"
disabled={@read_only}
title="Remove link"
>
<.icon name="hero-x-mark-micro" class="size-3" />
</button>
</div>
<label class="flex items-center gap-2 text-sm">
<input type="hidden" name={@base <> "[enabled]"} value="false" />
<input
type="checkbox"
name={@base <> "[enabled]"}
value="true"
checked={@link["enabled"] == true}
disabled={@read_only}
class="checkbox checkbox-xs"
/> Show icon
</label>
<label class="flex flex-col gap-1 text-xs">
<span class="opacity-70">Kind</span>
<select
name={@base <> "[kind]"}
disabled={@read_only}
class="select select-bordered select-sm"
>
<option
:for={{label, value} <- @kind_options}
value={value}
selected={@link["kind"] == value}
>{label}</option>
</select>
</label>
<label class="flex flex-col gap-1 text-xs">
<span class="opacity-70">Target</span>
<input
type="text"
name={@base <> "[target]"}
value={@link["target"] || ""}
placeholder="https://… or canvas-slug"
disabled={@read_only}
class="input input-bordered input-sm"
/>
</label>
<label class="flex flex-col gap-1 text-xs">
<span class="opacity-70">Icon</span>
<select
name={@base <> "[icon]"}
disabled={@read_only}
class="select select-bordered select-sm"
>
<option
:for={{label, value} <- @icon_options}
value={value}
selected={@link["icon"] == value}
>{label}</option>
</select>
</label>
</div>
"""
end
attr :clipboard, :any, default: nil
defp style_clipboard_preview(%{clipboard: nil} = assigns) do
~H"""
<div
id="clipboard-preview"
class="text-xs opacity-50 mb-3 italic"
>
Clipboard empty. Copy a style to apply it to new shapes.
</div>
"""
end
defp style_clipboard_preview(%{clipboard: {:element, style}} = assigns) do
assigns = assign(assigns, :style, style)
~H"""
<div
id="clipboard-preview"
class="flex items-center gap-2 text-xs mb-3 px-2 py-1 rounded border border-base-300 bg-base-100"
>
<span class="opacity-60">clipboard</span>
<span class="flex items-center gap-1">
<span
class="size-3 rounded border border-base-content/20 bg-transparent bg-[repeating-linear-gradient(45deg,_var(--color-base-content)_0_2px,_transparent_2px_4px)]"
style={"background: " <> token_var(Map.get(@style, "fill", "base-200"))}
title={"fill: " <> Map.get(@style, "fill", "base-200")}
/>
<span
class="size-3 rounded border-2"
style={"border-color: " <> token_var(Map.get(@style, "stroke", "base-content"))}
title={"border: " <> Map.get(@style, "stroke", "base-content")}
/>
</span>
<%= if @style["shadow"] do %>
<.icon name="hero-cube-transparent-micro" class="size-3 text-accent" />
<% end %>
<span class="ml-auto opacity-50 font-mono">element</span>
</div>
"""
end
defp style_clipboard_preview(%{clipboard: {:connector, style}} = assigns) do
assigns = assign(assigns, :style, style)
~H"""
<div
id="clipboard-preview"
class="flex items-center gap-2 text-xs mb-3 px-2 py-1 rounded border border-base-300 bg-base-100"
>
<span class="opacity-60">clipboard</span>
<svg width="44" height="10" viewBox="0 0 44 10" class="overflow-visible">
<line
x1="0"
y1="5"
x2="44"
y2="5"
stroke-width={Map.get(@style, "stroke_width", 2)}
stroke-dasharray={dash_preview(Map.get(@style, "dash", "solid"))}
style={"stroke: " <> token_var(Map.get(@style, "color", "base-content"))}
/>
</svg>
<span class="ml-auto opacity-50 font-mono">{@style["routing"] || "orthogonal"}</span>
</div>
"""
end
defp dash_preview("solid"), do: nil
defp dash_preview("dotted"), do: "2 4"
defp dash_preview("dashed"), do: "8 6"
defp dash_preview("dash-dot"), do: "8 4 2 4"
defp dash_preview(_), do: nil
end
neiam
/diogramos
diogramos
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