web: add scrollbar for read progress

web/src/state.rs

@@ -37,15 +37,36 @@ pub fn init(url: Url, orders: &mut impl Orders<Msg>) -> Model {
     // 'notmuch new' on the server periodically?
     orders.stream(streams::interval(30_000, || Msg::RefreshStart));
     orders.subscribe(on_url_changed);
+    orders.stream(streams::window_event(Ev::Scroll, |_| {
+        compute_scroll_ratio()
+    }));
 
     Model {
         context: Context::None,
         query: "".to_string(),
         refreshing_state: RefreshingState::None,
         tags: None,
+        read_completion_ratio: 0.,
     }
 }
 
+fn compute_scroll_ratio() -> Msg {
+    // TODO: compute completion based on contents of the post, not the overall body (which includes
+    // the tags at the end on mobile/tablet).
+    let body = document().body().expect("body");
+    let sh = body.scroll_height() as f64;
+    let window = window();
+    let ih = window
+        .inner_height()
+        .expect("window height")
+        .unchecked_into::<js_sys::Number>()
+        .value_of();
+    let scroll_y = window.scroll_y().expect("scroll Y");
+
+    let end = sh - ih;
+    let ratio = scroll_y / end;
+    Msg::SetProgress(ratio)
+}
 fn on_url_changed(uc: subs::UrlChanged) -> Msg {
     let mut url = uc.0;
     info!(
@@ -489,6 +510,9 @@ pub fn update(msg: Msg, model: &mut Model, orders: &mut impl Orders<Msg>) {
                     .expect("failed to copy to clipboard");
             });
         }
+        Msg::SetProgress(ratio) => {
+            model.read_completion_ratio = ratio;
+        }
     }
 }
 // `Model` describes our app state.
@@ -497,6 +521,7 @@ pub struct Model {
     pub context: Context,
     pub refreshing_state: RefreshingState,
     pub tags: Option<Vec<Tag>>,
+    pub read_completion_ratio: f64,
 }
 
 #[derive(Error, Debug)]
@@ -590,4 +615,6 @@ pub enum Msg {
     MultiMsg(Vec<Msg>),
 
     CopyToClipboard(String),
+
+    SetProgress(f64),
 }

web/src/view/desktop.rs

@@ -5,7 +5,7 @@ use crate::{
     api::urls,
     graphql::show_thread_query::*,
     state::{Context, Model, Msg},
-    view::{self, view_header, view_search_results, view_tags},
+    view::{self, reading_progress, view_header, view_search_results, view_tags},
 };
 
 #[topo::nested]
@@ -40,6 +40,7 @@ pub(super) fn view(model: &Model) -> Node<Msg> {
     };
     div![
         C!["main-content"],
+        reading_progress(model.read_completion_ratio),
         view_tags(model),
         div![
             view_header(&model.query, &model.refreshing_state),

web/src/view/mobile.rs

@@ -7,8 +7,8 @@ use crate::{
     graphql::{front_page_query::*, show_thread_query::*},
     state::{Context, Model, Msg},
     view::{
-        self, human_age, pretty_authors, search_toolbar, set_title, tags_chiclet, view_header,
+        self, human_age, pretty_authors, reading_progress, search_toolbar, set_title, tags_chiclet,
-        view_tags,
+        view_header, view_tags,
     },
 };
 
@@ -41,6 +41,7 @@ pub(super) fn view(model: &Model) -> Node<Msg> {
         ),
     };
     div![
+        reading_progress(model.read_completion_ratio),
         view_header(&model.query, &model.refreshing_state),
         content,
         view_header(&model.query, &model.refreshing_state),

web/src/view/mod.rs

@@ -1117,12 +1117,14 @@ fn news_post(post: &ShowThreadQueryThreadOnNewsPost, show_icon_text: bool) -> No
                 C!["body", "news-post", format!("site-{}", post.slug)],
                 raw![&post.body]
             ]
-        ] /* TODO(wathiede): plumb in orignal id
+        ],
+        /* TODO(wathiede): plumb in orignal id
         a![
         attrs! {At::Href=>api::original(&thread_node.0.as_ref().expect("message missing").id)},
         "Original"
         ],
         */
+        ev(Ev::Scroll, |e| info!("scroll event {e:?}"))
     ]
 }
 fn render_news_post_header(post: &ShowThreadQueryThreadOnNewsPost) -> Node<Msg> {
@@ -1181,3 +1183,20 @@ fn render_news_post_header(post: &ShowThreadQueryThreadOnNewsPost) -> Node<Msg>
         ]
     ]
 }
+fn reading_progress(ratio: f64) -> Node<Msg> {
+    let percent = ratio * 100.;
+    progress![
+        C![
+            "read-progress",
+            "progress",
+            "is-success",
+            "is-small",
+            IF!(percent<5. => "is-invisible")
+        ],
+        attrs! {
+            At::Value=>percent,
+            At::Max=>"100"
+        },
+        format!("{percent}%")
+    ]
+}

web/src/view/tablet.rs

@@ -4,7 +4,7 @@ use seed::{prelude::*, *};
 use crate::{
     graphql::show_thread_query::*,
     state::{Context, Model, Msg},
-    view::{self, view_header, view_search_results, view_tags},
+    view::{self, reading_progress, view_header, view_search_results, view_tags},
 };
 
 pub(super) fn view(model: &Model) -> Node<Msg> {
@@ -39,6 +39,7 @@ pub(super) fn view(model: &Model) -> Node<Msg> {
     div![
         C!["main-content"],
         div![
+            reading_progress(model.read_completion_ratio),
             view_header(&model.query, &model.refreshing_state),
             content,
             view_header(&model.query, &model.refreshing_state),

web/static/style.css

@@ -343,3 +343,9 @@ display: none;
 .button.spam {
   color: #f00;
 }
+
+progress.read-progress {
+  position: fixed;
+  top: 0;
+  z-index: 999;
+}