[UI] Render metadata text with book language

Gives the book language to Text*Widget (and XText) when
drawing title, authors and other metadata text.
Might be needed to properly display a Japanese book title
when the UI language is Chinese.

frontend/apps/filemanager/filemanagerbookinfo.lua

@@ -210,10 +210,18 @@ function BookInfo:show(file, book_props)
     end
     table.insert(kv_pairs, { _("Cover image:"), _("Tap to display"), callback=viewCoverImage })
 
+    -- Get a chance to have title, authors... rendered with alternate
+    -- glyphs for the book language (e.g. japanese book in chinese UI)
+    local values_lang = nil
+    if book_props.language and book_props.language ~= "" then
+        values_lang = book_props.language
+    end
+
     local widget = KeyValuePage:new{
         title = _("Book information"),
         value_overflow_align = "right",
         kv_pairs = kv_pairs,
+        values_lang = values_lang,
     }
     UIManager:show(widget)
 end

frontend/ui/widget/bookstatuswidget.lua

@@ -293,12 +293,20 @@ function BookStatusWidget:genBookInfoGroup()
 
     local height = img_height
     local width = screen_width - split_span_width - img_width
+
+    -- Get a chance to have title and authors rendered with alternate
+    -- glyphs for the book language
+    local lang = nil
+    if self.props.language and self.props.language ~= "" then
+        lang = self.props.language
+    end
     -- title
     local book_meta_info_group = VerticalGroup:new{
         align = "center",
         VerticalSpan:new{ width = height * 0.2 },
         TextBoxWidget:new{
             text = self.props.title,
+            lang = lang,
             width = width,
             face = self.medium_font_face,
             alignment = "center",
@@ -308,6 +316,7 @@ function BookStatusWidget:genBookInfoGroup()
     -- author
     local text_author = TextBoxWidget:new{
         text = self.props.authors,
+        lang = lang,
         face = self.small_font_face,
         width = width,
         alignment = "center",

frontend/ui/widget/keyvaluepage.lua

@@ -116,6 +116,7 @@ end
 local KeyValueItem = InputContainer:new{
     key = nil,
     value = nil,
+    value_lang = nil,
     cface = Font:getFace("smallinfofont"),
     tface = Font:getFace("smallinfofontbold"),
     width = nil,
@@ -162,6 +163,7 @@ function KeyValueItem:init()
         text = tvalue,
         max_width = available_width,
         face = self.cface,
+        lang = self.value_lang,
     }
     local key_w_rendered = key_widget:getWidth()
     local value_w_rendered = value_widget:getWidth()
@@ -288,6 +290,7 @@ function KeyValueItem:onHold()
     local textviewer = TextViewer:new{
         title = self.key,
         text = self.value,
+        lang = self.value_lang,
         width = self.textviewer_width,
         height = self.textviewer_height,
     }
@@ -300,6 +303,7 @@ local KeyValuePage = InputContainer:new{
     title = "",
     width = nil,
     height = nil,
+    values_lang = nil,
     -- index for the first item to show
     show_page = 1,
     use_top_page_count = false,
@@ -514,6 +518,7 @@ function KeyValuePage:_populateItems()
                     width = self.item_width,
                     key = entry[1],
                     value = entry[2],
+                    value_lang = self.values_lang,
                     callback = entry.callback,
                     callback_back = entry.callback_back,
                     textviewer_width = self.textviewer_width,

plugins/coverbrowser.koplugin/listmenu.lua

@@ -556,8 +556,11 @@ function ListMenuItem:update()
                 end
                 -- BookInfoManager:extractBookInfo() made sure
                 -- to save as nil (NULL) metadata that were an empty string
+                -- We provide the book language to get a chance to render title
+                -- and authors with alternate glyphs for that language.
                 wtitle = TextBoxWidget:new{
                     text = title,
+                    lang = bookinfo.language,
                     face = Font:getFace(fontname_title, fontsize_title),
                     width = wmain_width,
                     alignment = "left",
@@ -568,6 +571,7 @@ function ListMenuItem:update()
                 if authors then
                     wauthors = TextBoxWidget:new{
                         text = authors,
+                        lang = bookinfo.language,
                         face = Font:getFace(fontname_authors, fontsize_authors),
                         width = wmain_width,
                         alignment = "left",

plugins/coverbrowser.koplugin/mosaicmenu.lua

@@ -108,6 +108,7 @@ local FakeCover = FrameContainer:new{
     filename_add = nil,
     title_add = nil,
     authors_add = nil,
+    book_lang = nil,
     -- these font sizes will be scaleBySize'd by Font:getFace()
     authors_font_max = 20,
     authors_font_min = 6,
@@ -225,6 +226,7 @@ function FakeCover:init()
         if authors then
             authors_wg = TextBoxWidget:new{
                 text = authors,
+                lang = self.book_lang,
                 face = Font:getFace("cfont", math.max(self.authors_font_max - sizedec, self.authors_font_min)),
                 width = text_width,
                 alignment = "center",
@@ -234,6 +236,7 @@ function FakeCover:init()
         if title then
             title_wg = TextBoxWidget:new{
                 text = title,
+                lang = self.book_lang,
                 face = Font:getFace("cfont", math.max(self.title_font_max - sizedec, self.title_font_min)),
                 width = text_width,
                 alignment = "center",
@@ -243,6 +246,7 @@ function FakeCover:init()
         if filename then
             filename_wg = TextBoxWidget:new{
                 text = filename,
+                lang = self.book_lang, -- might as well use it for filename
                 face = Font:getFace("cfont", math.max(self.filename_font_max - sizedec, self.filename_font_min)),
                 width = text_width,
                 alignment = "center",
@@ -625,6 +629,7 @@ function MosaicMenuItem:update()
                         authors = not bookinfo.ignore_meta and bookinfo.authors,
                         title_add = not bookinfo.ignore_meta and title_add,
                         authors_add = not bookinfo.ignore_meta and authors_add,
+                        book_lang = not bookinfo.ignore_meta and bookinfo.language,
                         file_deleted = self.file_deleted,
                     }
                 }