Work on preferences UI for keyboard shortcuts

src/pyj/book_list/item_list.pyj

@@ -48,9 +48,12 @@ def build_list(container, items, subtitle):
             div.appendChild(E.div(item.subtitle, class_='item-subtitle', style='padding-top:1ex'))
         if item.action:
             ul.lastChild.addEventListener('click', item.action)
+        if item.data:
+            ul.lastChild.dataset.userData = item.data
 
-def create_item(title, action=None, subtitle=None, icon=None):
+
-    return {'title':title, 'action':action, 'subtitle':subtitle, 'icon':icon}
+def create_item(title, action=None, subtitle=None, icon=None, data=None):
+    return {'title':title, 'action':action, 'subtitle':subtitle, 'icon':icon, 'data': data}
 
 
 def create_item_list(container, items, subtitle=None):

src/pyj/read_book/iframe.pyj

@@ -153,7 +153,7 @@ class IframeBoss:
             self._handle_gesture = paged_handle_gesture
             self.anchor_funcs = paged_anchor_funcs
         update_settings(data.settings)
-        self.keyboard_shortcut_map = create_shortcut_map()
+        self.keyboard_shortcut_map = create_shortcut_map(data.keyboard_shortcuts)
         set_current_spine_item({'name':data.name, 'is_first':index is 0, 'is_last':index is spine.length - 1, 'initial_position':data.initial_position})
         self.last_cfi = None
         for name in self.blob_url_map:

src/pyj/read_book/prefs/keyboard.pyj

@@ -0,0 +1,89 @@
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
+from __python__ import bound_methods, hash_literals
+
+from elementmaker import E
+from gettext import gettext as _
+
+from book_list.globals import get_session_data
+from book_list.item_list import create_item, create_item_list
+from dom import unique_id
+from read_book.shortcuts import GROUP_DESC, SHORTCUTS
+from widgets import create_button
+
+
+def get_container():
+    return document.getElementById(get_container.id)
+
+
+def restore_defaults():
+    pass
+
+
+def as_groups(shortcuts):
+    ans = {}
+    for sc_name in Object.keys(shortcuts):
+        sc = shortcuts[sc_name]
+        if not ans[sc.group]:
+            ans[sc.group] = {}
+        ans[sc.group][sc_name] = sc
+    return ans
+
+
+def sort_group_key(group, sc_name):
+    return group[sc_name].short.toLowerCase()
+
+
+def sc_as_item(sc_name, sc):
+    return create_item(sc.short, action=customize_shortcut.bind(None, sc_name), subtitle=sc.long, data=JSON.stringify({'name': sc_name, 'shortcuts': sc.shortcuts}))
+
+
+def customize_shortcut(sc_name):
+    container = get_container()
+    container.firstChild.style.display = 'none'
+    container.lastChild.style.display = 'block'
+    sc = SHORTCUTS[sc_name]
+    container.appendChild(E.h4(sc.short))
+    if sc.long:
+        container.appendChild(E.div(sc.long, style='font-style: italic; font-size: smaller; margin-top: 1ex'))
+    container.appendChild(E.div(_('Existing shortcuts:')))
+    for key in sc.shortcuts:
+        container.appendChild(E.div(style='margin-top: 1ex', key_widget(key)))
+    container.appendChild(E.div(style='margin-top:1ex; display:flex; justify-content: flex-end',
+        create_button(_('OK'), action=close_customize_shortcut.bind(None, True)),
+        E.span('\xa0'),
+        create_button(_('Cancel'), action=close_customize_shortcut.bind(None, False)),
+    ))
+
+
+
+def create_keyboard_panel(container):
+    container.appendChild(E.div(id=unique_id('keyboard-settings'), style='margin: 1rem'))
+    container = container.lastChild
+    get_container.id = container.id
+    container.appendChild(E.div())
+    container.appendChild(E.div(style='display: none'))
+    container = container.firstChild
+    groups = as_groups(SHORTCUTS)
+    items = []
+    for group_name in Object.keys(groups):
+        container.appendChild(E.h3(GROUP_DESC[group_name]))
+        group = groups[group_name]
+        for sc_name in sorted(Object.keys(group), key=sort_group_key.bind(None, group)):
+            sc = group[sc_name]
+            items.push(sc_as_item(sc_name, sc))
+        container.appendChild(E.div())
+        create_item_list(container.lastChild, items)
+
+    container.appendChild(E.div(
+        style='margin-top: 1rem', create_button(_('Restore defaults'), action=restore_defaults)
+    ))
+
+
+develop = create_keyboard_panel
+
+
+def commit_keyboard(onchange):
+    sd = get_session_data()
+    vals = {}
+    sd.set('standalone_misc_settings', vals)

src/pyj/read_book/prefs/main.pyj

@@ -11,6 +11,7 @@ from read_book.globals import runtime
 from read_book.prefs.colors import commit_colors, create_colors_panel
 from read_book.prefs.fonts import commit_fonts, create_fonts_panel
 from read_book.prefs.head_foot import commit_head_foot, create_head_foot_panel
+from read_book.prefs.keyboard import commit_keyboard, create_keyboard_panel
 from read_book.prefs.layout import commit_layout, create_layout_panel
 from read_book.prefs.misc import commit_misc, create_misc_panel
 from read_book.prefs.user_stylesheet import (
@@ -70,6 +71,7 @@ class Prefs:
             create_item(_('Page layout'), def():self.show_panel('layout');, _('Page margins and number of pages per screen')),
             create_item(_('User style sheet'), def():self.show_panel('user_stylesheet');, _('Style rules for text')),
             create_item(_('Headers and footers'), def():self.show_panel('head_foot');, _('Customize the headers and footers')),
+            create_item(_('Keyboard shortcuts'), def():self.show_panel('keyboard');, _('Customize the keyboard shortcuts')),
         ]
         if runtime.is_standalone_viewer:
             items.push(create_item(
@@ -120,6 +122,13 @@ class Prefs:
     def close_head_foot(self):
         commit_head_foot(self.onchange, self.container)
 
+    def display_keyboard(self, container):
+        document.getElementById(self.title_id).textContent = _('Keyboard shortcuts')
+        create_keyboard_panel(container)
+
+    def close_keyboard(self):
+        commit_keyboard(self.onchange, self.container)
+
 
 def create_prefs_panel(container, close_func, on_change):
     Prefs(container, close_func, on_change)

src/pyj/read_book/shortcuts.pyj

@@ -31,20 +31,16 @@ def desc(sc, group, short, long):
     pkey = v'[]'
     for x in sc:
         pkey.push(parse_key_repr(x))
-    return {'short': short, 'long': long, 'shortcuts': pkey}
+    return {'group': group, 'short': short, 'long': long, 'shortcuts': pkey}
 
 
-def serialize_keyevent(evt):
+def keyevent_as_shortcut(evt):
     return {
         'key': evt.key, 'altKey': evt.altKey, 'ctrlKey': evt.ctrlKey,
         'metaKey': evt.metaKey, 'shiftKey': evt.shiftKey
     }
 
 
-def unserialize_keyevent(sc):
-    return sc
-
-
 def keyevent_to_index(evt):
     parts = v'[]'
     for mod in v"['altKey', 'ctrlKey', 'metaKey', 'shiftKey']":
@@ -52,6 +48,11 @@ def keyevent_to_index(evt):
     return parts.join('') + evt.key
 
 
+GROUP_DESC = {
+    'scroll': _('Navigation')
+}
+
+
 SHORTCUTS = {
     'start_of_file': desc(
         v"['Ctrl+ArrowUp', 'Ctrl+ArrowLeft', 'Home']",

src/pyj/read_book/view.pyj

@@ -426,6 +426,7 @@ class View:
             'color_scheme': self.get_color_scheme(True),
             'base_font_size': sd.get('base_font_size'),
             'user_stylesheet': sd.get('user_stylesheet'),
+            'keyboard_shortcuts': sd.get('keyboard_shortcuts'),
         }
 
     def show_name(self, name, initial_position=None):

src/pyj/session.pyj

@@ -40,6 +40,7 @@ defaults = {
     'header': {},
     'footer': {'right': 'progress'},
     'word_actions': v'[]',
+    'keyboard_shortcuts': {},
     'standalone_font_settings': {},
     'standalone_misc_settings': {},
     'standalone_recently_opened': v'[]',