Implement time left calculation for flow mode as well

src/pyj/read_book/flow_mode.pyj

@@ -14,19 +14,72 @@ from utils import document_height, document_width, viewport_to_document
 def flow_to_scroll_fraction(frac):
     scroll_viewport.scroll_to(0, document_height() * frac)
 
+
+small_scroll_events = v'[]'
+
+
+def clear_small_scrolls():
+    nonlocal small_scroll_events
+    small_scroll_events = v'[]'
+
+
+def dispatch_small_scrolls():
+    if small_scroll_events.length:
+        now = window.performance.now()
+        if now - small_scroll_events[-1].time <= 2000:
+            window.setTimeout(dispatch_small_scrolls, 100)
+            return
+        amt = 0
+        for x in small_scroll_events:
+            amt += x.amt
+        clear_small_scrolls()
+        get_boss().report_human_scroll(amt / document_height())
+
+
+def add_small_scroll(amt):
+    small_scroll_events.push({'amt': amt, 'time': window.performance.now()})
+    window.setTimeout(dispatch_small_scrolls, 100)
+
+
+def report_human_scroll(amt):
+    if amt > 0:
+        h = scroll_viewport.height()
+        is_large_scroll = (amt / h) >= 0.5
+        if is_large_scroll:
+            clear_small_scrolls()
+            get_boss().report_human_scroll(amt / document_height())
+        else:
+            add_small_scroll(amt)
+    else:
+        clear_small_scrolls()
+
+
+def _check_for_scroll_end(func, obj, args, report):
+    before = window.pageYOffset
+    func.apply(obj, args)
+    if window.pageYOffset is before:
+        get_boss().send_message('next_spine_item', previous=arguments[0] < 0)
+        return False
+    if report:
+        report_human_scroll(window.pageYOffset - before)
+    return True
+
+
 def check_for_scroll_end(func):
     return def ():
-        before = window.pageYOffset
-        func.apply(this, arguments)
-        if window.pageYOffset is before:
-            get_boss().send_message('next_spine_item', previous=arguments[0] < 0)
-            return False
-        return True
+        return _check_for_scroll_end(func, this, arguments, False)
 
-@check_for_scroll_end
+
+def check_for_scroll_end_and_report(func):
+    return def ():
+        return _check_for_scroll_end(func, this, arguments, True)
+
+
+@check_for_scroll_end_and_report
 def scroll_by(y):
     window.scrollBy(0, y)
 
+
 def flow_onwheel(evt):
     dx = dy = 0
     if evt.deltaY:
@@ -61,15 +114,19 @@ def smooth_y_scroll(up):
     smooth_y_data.up = up
     do_y_scroll()
 
+
 @check_for_scroll_end
 def goto_boundary(y):
     scroll_viewport.scroll_to(window.pageXOffset, 0)
+    get_boss().report_human_scroll()
 
-@check_for_scroll_end
+
+@check_for_scroll_end_and_report
 def scroll_by_page(backward):
     h = scroll_viewport.height() - 10
     window.scrollBy(0, -h if backward else h)
 
+
 def flow_onkeydown(evt):
     handled = False
     key = get_key(evt)
@@ -87,6 +144,8 @@ def flow_onkeydown(evt):
             window.scrollBy(-15 if key is 'left' else 15, 0)
     elif key is 'home' or key is 'end':
         handled = True
+        get_boss().report_human_scroll()
+        clear_small_scrolls()
         if evt.ctrlKey:
             get_boss().send_message('goto_doc_boundary', start=key is 'home')
         else:
@@ -100,9 +159,11 @@ def flow_onkeydown(evt):
     if handled:
         evt.preventDefault()
 
+
 def layout(is_single_page):
     set_css(document.body, margin='0', border_width='0', padding='0')
 
+
 class FlickAnimator:
 
     SPEED_FACTOR = 0.04

src/pyj/read_book/iframe.pyj

@@ -170,8 +170,8 @@ class IframeBoss:
     def gesture_from_margin(self, data):
         self.handle_gesture(data.gesture)
 
-    def report_human_scroll(self, scrolled_by_frac, is_large_scroll):
-        self.send_message('human_scroll', scrolled_by_frac=scrolled_by_frac or None, is_large_scroll=v'!!is_large_scroll')
+    def report_human_scroll(self, scrolled_by_frac):
+        self.send_message('human_scroll', scrolled_by_frac=scrolled_by_frac or None)
 
     def on_scroll_to_anchor(self, data):
         frag = data.frag

src/pyj/read_book/paged_mode.pyj

@@ -472,7 +472,7 @@ def scroll_by_page(backward, by_screen):
     else:
         if not backward:
             scrolled_frac = (pages / number_of_cols) if number_of_cols > 0 else 0
-            get_boss().report_human_scroll(scrolled_frac, True)
+            get_boss().report_human_scroll(scrolled_frac)
         else:
             get_boss().report_human_scroll()
         scroll_to_xpos(pos)

src/pyj/read_book/timers.pyj

@@ -37,7 +37,7 @@ class Timers:
         else:
             self.average = self.stddev = 0
 
-    def on_human_scroll(self, amt_scrolled, is_large_scroll):
+    def on_human_scroll(self, amt_scrolled):
         last_scroll_at = self.last_scroll_at
         self.last_scroll_at = now = window.performance.now()
         if last_scroll_at is None:
@@ -45,7 +45,7 @@ class Timers:
         time_since_last_scroll = (now - last_scroll_at) / 1000
         if time_since_last_scroll <= 0 or time_since_last_scroll >= 300:
             return
-        if is_large_scroll and time_since_last_scroll < 2:
+        if time_since_last_scroll < 2:
             return
         rate = amt_scrolled / time_since_last_scroll
         if self.rates.length >= FILTER_THRESHOLD and Math.abs(rate - self.average) > 2 * self.stddev:

src/pyj/read_book/view.pyj

@@ -225,7 +225,7 @@ class View:
             length = self.book.manifest.files[name]?.length
             if length:
                 amt_scrolled = data.scrolled_by_frac * length
-                self.timers.on_human_scroll(amt_scrolled, data.is_large_scroll)
+                self.timers.on_human_scroll(amt_scrolled)
 
     def find(self, text, backwards):
         self.iframe_wrapper.send_message('find', text=text, backwards=backwards, searched_in_spine=False)