More work on the Go to implementation

src/pyj/read_book/globals.pyj

@@ -15,6 +15,10 @@ def set_boss(b):
 def get_boss():
     return _boss
 
+def current_book():
+    return current_book.book
+current_book.book = None
+
 class Messenger:
 
     def __init__(self):

src/pyj/read_book/goto.pyj

@@ -6,9 +6,23 @@ from dom import set_css, svgicon
 from elementmaker import E
 from gettext import gettext as _
 
+from book_list.item_list import create_item, build_list
+from read_book.toc import get_toc_maps, get_border_nodes
+from read_book.globals import current_book
+
 
 def create_goto_list(onclick):
-    return E.div()
+    ans = E.div()
+    items = v'[]'
+    toc = current_book().manifest.toc
+    id_map = get_toc_maps(toc)[1]
+    before, after = get_border_nodes(toc, id_map)
+    if after:
+        items.push(create_item(_('Next Section'), icon='caret-right', subtitle=after.title, action=onclick.bind(after.dest, after.frag)))
+    if before:
+        items.push(create_item(_('Previous Section'), icon='caret-left', subtitle=before.title, action=onclick.bind(before.dest, before.frag)))
+    build_list(ans, items)
+    return ans
 
 
 def create_goto_panel(book, container, onclick, onclose):
@@ -17,10 +31,7 @@ def create_goto_panel(book, container, onclick, onclose):
         E.h2(_('Go to...')),
         E.div(svgicon('close'), style='cursor:pointer', onclick=def(event):event.preventDefault(), event.stopPropagation(), onclose(event);, class_='simple-link'),
     ))
-    def handle_click(event, li):
-        if event.button is 0:
-            onclick(li.dataset.tocDest, li.dataset.tocFrag)
-    panel = create_goto_list(handle_click)
+    panel = create_goto_list(onclick)
     set_css(container, display='flex', flex_direction='column')
     set_css(panel, flex_grow='10')
     container.appendChild(panel)

src/pyj/read_book/iframe.pyj

@@ -6,7 +6,7 @@ import traceback
 from aes import GCM
 from gettext import install, gettext as _
 from read_book.cfi import at_current, scroll_to as scroll_to_cfi
-from read_book.globals import set_boss, set_current_spine_item, current_layout_mode, current_spine_item, set_layout_mode
+from read_book.globals import set_boss, set_current_spine_item, current_layout_mode, current_spine_item, set_layout_mode, current_book
 from read_book.mathjax import apply_mathjax
 from read_book.toc import update_visible_toc_anchors
 from read_book.resources import finalize_resources, unserialize_html
@@ -94,7 +94,7 @@ class IframeBoss:
 
     def display(self, data):
         self.encrypted_communications = True
-        self.book = data.book
+        self.book = current_book.book = data.book
         spine = self.book.manifest.spine
         index = spine.indexOf(data.name)
         set_layout_mode('flow' if FORCE_FLOW_MODE else data.settings.read_mode)

src/pyj/read_book/toc.pyj

@@ -8,7 +8,7 @@ from elementmaker import E
 from gettext import gettext as _
 from modals import error_dialog
 from widgets import create_tree, find_text_in_tree, scroll_tree_item_into_view
-from read_book.globals import toc_anchor_map, set_toc_anchor_map, current_spine_item, current_layout_mode, get_boss
+from read_book.globals import toc_anchor_map, set_toc_anchor_map, current_spine_item, current_layout_mode, current_book
 
 
 def update_visible_toc_nodes(visible_anchors):
@@ -36,7 +36,7 @@ def get_border_nodes(toc, id_map):
         return before, after
     # Find the ToC entries that point to the closest files on either side of the
     # current spine item
-    spine = get_boss().book.manifest.spine
+    spine = current_book().manifest.spine
     spine_before, spine_after = {}, {}
     which = spine_before
     csi = current_spine_item()
@@ -82,7 +82,7 @@ def get_highlighted_toc_nodes(toc, parent_map, id_map):
 
 def get_toc_maps(toc):
     if not toc:
-        toc = get_boss().book.manifest.toc
+        toc = current_book().manifest.toc
     parent_map, id_map = {}, {}
 
     def process_node(node, parent):

src/pyj/read_book/view.pyj

@@ -6,7 +6,7 @@ from book_list.globals import get_session_data, get_boss
 from dom import set_css, add_extra_css, build_rule, svgicon
 from elementmaker import E
 from gettext import gettext as _
-from read_book.globals import messenger, iframe_id
+from read_book.globals import messenger, iframe_id, current_book
 from read_book.resources import load_resources
 from read_book.overlay import Overlay
 from read_book.prefs.colors import resolve_color_scheme
@@ -225,7 +225,7 @@ class View:
         self.overlay.hide_loading_message()
 
     def display_book(self, book):
-        self.book = book
+        self.book = current_book.book = book
         self.ui.db.update_last_read_time(book)
         self.loaded_resources = {}
         pos = {'replace_history':True}