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|
(ns frq.hiccup
"glimmer's hiccup, painted by Flutter.
This is a backend, not a port. `frq.app` is 1,834 lines of
`[:vbox {:spacing 6} ...]` over about twenty tags, and it names no toolkit
anywhere — the same trick `frq.cosmic` and `frq.tui` rely on, where the
components do not know what is under the reconciler. So the screens do not
get rewritten for the phone; this interprets them.
The tags are glimmer's and so is the styling: every arm below is what
`crates/jolt-cosmic` asks libcosmic for, in `frq.theme`'s tokens. `:title` is
title3 and `:title-2` is title4; `:card` is Container::Card — padding 12,
spacing 8, a surface a step from the background rather than an elevation,
because COSMIC does not float things; `:button` is suggested, destructive or
standard; `:dim-label` is the caption class, which is the body colour stepped
back rather than a colour of its own.
Material is underneath and deliberately not visible. No elevation, no ripple
shadows, no Material 3 pill heights — a screen laid out against libcosmic's
4/8/12/16/24 spacing lands at the same proportions here.
What this does NOT do is glimmer's reconciliation. glimmer patches the tree
it painted last; Flutter rebuilds from the top and diffs its own element
tree, which is the same job done by the framework instead of by us. The cost
is that a cell firing rebuilds the whole screen rather than the subtree that
read it — fine at this size, and the thing to revisit if a message list ever
feels it."
(:require ["dart:io" :as io]
["package:flutter/material.dart" :as m]
[cljd.flutter :as f]
[frq.theme :as t]))
(defn- dbl [x default]
(cond (number? x) (double x)
:else default))
;; ------------------------------------------------------------- text entry
(defonce ^:private controllers
;; TextEditingController per `:key`, because a controller made during a build
;; is a new one every rebuild — the cursor jumps to the start and the
;; selection is lost on the keystroke after it.
;;
;; Keyed rather than positional: glimmer's own reconciler matches children by
;; `:key` for the same reason, and an entry that moves in the tree should
;; keep what is typed in it.
(atom {}))
(defn- controller-for [k text]
(let [k (or k ::anonymous)
c (or (get @controllers k)
(let [c (m/TextEditingController .text (or text ""))]
(swap! controllers assoc k c)
c))]
;; Only when it differs, and never while it would move the caret: the cell
;; is the authority for what the entry says, but the person typing is the
;; authority for where they are in it.
(when (and text (not= text (.-text c)))
(set! (.-text c) text))
c))
;; ------------------------------------------------------------------ props
(defn- props [node]
(let [p (second node)] (if (map? p) p {})))
(defn- body [node]
(let [p (second node)] (if (map? p) (drop 2 node) (drop 1 node))))
(declare render)
(defn- children
"Flatten seqs, drop nils. `(for [...] ...)` in a component yields a seq in
the child position and glimmer splices it; so does this."
[nodes]
(persistent!
(reduce (fn [acc n]
(cond (nil? n) acc
(seq? n) (reduce conj! acc (children n))
:else (conj! acc (render n))))
(transient []) nodes)))
;; ------------------------------------------------------------------ text
(defn- txt
[ctx s size color & {:keys [weight]}]
(m/Text (str s)
.style (m/TextStyle .fontSize size
.color color
.height 1.35
.fontWeight (or weight m/FontWeight.w400))))
;; ---------------------------------------------------------------- buttons
(defn- cosmic-button
"libcosmic's three button classes. Filled accent for suggested, filled red
for destructive, and a component-coloured fill for standard — COSMIC's
standard button is a filled surface, not an outline."
[ctx p on]
(let [kind (cond (:destructive p) :destructive
(or (:primary p) (= "primary" (:kind p))) :suggested
:else :standard)
bg (case kind
:suggested t/accent
:destructive t/destructive
t/component)
;; COSMIC names the foreground for each role, and for this theme both
;; accent.on and destructive.on are black — a cream accent with white
;; text on it is unreadable, which is exactly what guessing produced.
fg (case kind
:suggested t/on-accent
:destructive t/on-destructive
t/on-bg)]
(m/Material
.color bg
.borderRadius (m/BorderRadius.circular t/radius-m)
.child (m/InkWell
.borderRadius (m/BorderRadius.circular t/radius-m)
.onTap (when on #(on))
.child (m/Padding
.padding (m/EdgeInsets.symmetric .horizontal t/space-s
.vertical t/space-xxs)
.child (txt ctx (:label p "") t/text-body fg
:weight m/FontWeight.w500))))))
;; ----------------------------------------------------------------- widget
(defn- render-tag [tag node]
(f/widget
:context ctx
(let [p (props node)
kids (children (body node))
col (fn [sp cs] (m/Column .crossAxisAlignment m/CrossAxisAlignment.start
.mainAxisSize m/MainAxisSize.min
.spacing sp
.children cs))]
(case tag
:vbox
(let [c (col (dbl (:spacing p) 0.0) kids)]
(if-let [w (:width-request p)]
(m/SizedBox .width (dbl w 0.0) .child c)
c))
;; `page` is jolt-cosmic's scrollable container, centred and capped.
:page
(m/Center
.child (m/ConstrainedBox
.constraints (m/BoxConstraints .maxWidth (dbl (:max-width p) 520.0))
.child (m/Padding
.padding (m/EdgeInsets.all t/space-s)
.child (col t/space-xs kids))))
:hbox
(m/Row
.crossAxisAlignment m/CrossAxisAlignment.center
.mainAxisSize m/MainAxisSize.min
.spacing (dbl (:spacing p) 0.0)
.children kids)
:label (txt ctx (:label p "") t/text-body t/on-bg)
:dim-label (txt ctx (:label p "") t/text-caption t/dim)
:title (txt ctx (:label p "") t/text-title-3 t/on-bg
:weight m/FontWeight.w600)
:title-2 (txt ctx (:label p "") t/text-title-4 t/on-bg
:weight m/FontWeight.w600)
:button (cosmic-button ctx p (:on-click p))
;; button::link — accent text, no underline. COSMIC links are buttons.
:link
(m/InkWell
.onTap (when-let [on (:on-click p)] #(on))
.child (txt ctx (:label p "") t/text-body t/accent))
;; Container::Card: padding 12, spacing 8, fills its width unless it is
;; sitting in a row.
:card
(m/Container
.width double/infinity
.padding (m/EdgeInsets.all t/space-xs)
.decoration (m/BoxDecoration
.color t/card
.borderRadius (m/BorderRadius.circular t/radius-s))
.child (col (dbl (:spacing p) t/space-xxs) kids))
:separator (m/Divider .height 1.0 .thickness 1.0 .color t/divider)
;; A 16px indeterminate circle, with the label as a caption beside it.
:spinner
(m/Row
.mainAxisSize m/MainAxisSize.min
.spacing t/space-xxs
.children (into [(m/SizedBox
.width 16.0 .height 16.0
.child (m/CircularProgressIndicator
.strokeWidth 2.0
.color t/accent))]
(when-let [l (not-empty (str (:label p "")))]
[(txt ctx l t/text-caption t/dim)])))
;; A dot that says whether the thing is live, and the words beside it.
:status
(m/Row
.mainAxisSize m/MainAxisSize.min
.spacing 6.0
.children [(m/Container
.width 8.0 .height 8.0
.decoration (m/BoxDecoration
.color (if (:live p) t/success t/dim)
.borderRadius (m/BorderRadius.circular t/radius-xs)))
(txt ctx (:label p "") t/text-caption t/dim)])
:spacer
(let [size (dbl (or (:size p) (:gap p) (:width-request p)) t/space-xxs)]
(m/SizedBox .width size .height size))
:checkbutton
(let [on (:on-toggled p)]
(m/Row
.mainAxisSize m/MainAxisSize.min
.spacing t/space-xxxs
.children [(m/SizedBox
.width 20.0 .height 20.0
.child (m/Checkbox
.value (boolean (:active p))
.activeColor t/accent
.onChanged (when on (fn [v] (on (boolean v))))))
(txt ctx (:label p "") t/text-body t/on-bg)]))
;; text_input: a filled rounded field, no outline. COSMIC entries sit in
;; the component colour rather than behind a border.
:entry
(let [on-change (:on-change p)
on-activate (:on-activate p)
rows (:rows p)]
(m/TextField
.controller (controller-for (:key p) (:text p))
.onChanged (when on-change #(on-change %))
.onSubmitted (when on-activate (fn [_] (on-activate)))
.maxLines (if rows (int rows) 1)
.style (m/TextStyle .fontSize t/text-body .color t/on-bg)
.cursorColor t/accent
.decoration (m/InputDecoration
.isDense true
.filled true
.fillColor t/component
.hintText (:placeholder p)
.hintStyle (m/TextStyle .fontSize t/text-body
.color t/dim)
.contentPadding (m/EdgeInsets.symmetric
.horizontal t/space-xs
.vertical t/space-xxs)
.border (m/OutlineInputBorder
.borderRadius (m/BorderRadius.circular t/radius-s)
.borderSide m/BorderSide.none)
.enabledBorder (m/OutlineInputBorder
.borderRadius (m/BorderRadius.circular t/radius-s)
.borderSide m/BorderSide.none)
.focusedBorder (m/OutlineInputBorder
.borderRadius (m/BorderRadius.circular t/radius-s)
.borderSide (m/BorderSide .color t/accent
.width 1.0)))))
:emoji
(m/Text (str (:emoji p "")) .style (m/TextStyle .fontSize (dbl (:size p) 16.0)))
:avatar
(let [s (dbl (:size p) 32.0)
src (:src p)]
(m/CircleAvatar
.radius (/ s 2.0)
.backgroundColor t/component
.backgroundImage (when (and src (not= "" src)) (m/NetworkImage src))
.child (when (or (nil? src) (= "" src))
(txt ctx (let [l (str (:label p ""))]
(if (pos? (count l)) (.toUpperCase (subs l 0 1)) "?"))
t/text-body t/on-bg))))
:image
(let [src (or (:src p) (:path p))
w (:max-width p)
h (:max-height p)
img (cond
(nil? src) (m/SizedBox .width 0.0 .height 0.0)
(or (.startsWith (str src) "http://")
(.startsWith (str src) "https://"))
(m/Image.network (str src) .fit m/BoxFit.contain)
:else (m/Image.file (io/File. (str src)) .fit m/BoxFit.contain))
img (m/ClipRRect .borderRadius (m/BorderRadius.circular t/radius-s)
.child img)
img (if (or w h)
(m/ConstrainedBox
.constraints (m/BoxConstraints
.maxWidth (dbl w double/infinity)
.maxHeight (dbl h double/infinity))
.child img)
img)]
(if-let [on (:on-click p)]
(m/InkWell .onTap #(on) .child img)
img))
:scroll
(m/Expanded
.child (m/SingleChildScrollView
.child (col (dbl (:spacing p) 0.0) kids)))
;; A tag this backend has not grown yet still shows its children — which
;; is what libvidya did and what jolt-cosmic kept. The marker is here so
;; it is obvious which ones are missing: glimmer-cosmic's spike painted
;; every unknown tag as a silent column, and that is why most of frq
;; came out of it as stacked text.
(m/Column
.crossAxisAlignment m/CrossAxisAlignment.start
.mainAxisSize m/MainAxisSize.min
.children (into [(txt ctx (str "?" (name tag)) 10.0 m/Colors.orange)]
kids))))))
(defn render
"One hiccup node as a Flutter widget.
A vector whose head is a function is a component: glimmer calls it with the
rest of the vector as arguments and renders what comes back, and so does
this. Everything else is a tag."
[node]
(cond
(nil? node) (m/SizedBox .width 0.0 .height 0.0)
(string? node) (m/Text node)
(vector? node)
(let [head (first node)]
(if (keyword? head)
(render-tag head node)
(render (apply head (rest node)))))
(seq? node)
(m/Column .crossAxisAlignment m/CrossAxisAlignment.start
.mainAxisSize m/MainAxisSize.min
.children (children node))
:else (m/Text (str node))))
|
