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Viewer: prevent flash of unstyled text while loading individual HTML files

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Kovid Goyal 2019-10-15 05:25:54 +05:30
parent dfdf3e113a
commit 0bf8898ca4
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2 changed files with 14 additions and 6 deletions
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12
src/pyj/read_book/iframe.pyj
View File

@ -262,15 +262,17 @@ class IframeBoss:
self.do_layout(self.is_titlepage) self.do_layout(self.is_titlepage)
if self.mathjax: if self.mathjax:
return apply_mathjax(self.mathjax, self.book.manifest.link_uid, self.content_loaded_stage2) return apply_mathjax(self.mathjax, self.book.manifest.link_uid, self.content_loaded_stage2)
self.content_loaded_stage2() window.setTimeout(self.content_loaded_stage2, 1000)
# self.content_loaded_stage2()
def content_loaded_stage2(self): def content_loaded_stage2(self):
# this is the loading styles used to suppress scrollbars during load
# added in unserialize_html
document.head.firstChild.textContent = ''
self.connect_links() self.connect_links()
self.content_ready = True self.content_ready = True
# this is the loading styles used to suppress scrollbars during load
# added in unserialize_html and the overlay to hide flash of unstyled
# text
document.body.removeChild(document.body.firstChild)
csi = current_spine_item() csi = current_spine_item()
if csi.initial_position: if csi.initial_position:
ipos = csi.initial_position ipos = csi.initial_position

8
src/pyj/read_book/resources.pyj
View File

@ -236,7 +236,13 @@ def unserialize_html(serialized_data, proceed, postprocess_dom):
head, body = tree[1], tree[2] # noqa: unused-local head, body = tree[1], tree[2] # noqa: unused-local
clear(document.head, document.body) clear(document.head, document.body)
remove_all_attributes(document.head, document.body) remove_all_attributes(document.head, document.body)
document.head.appendChild(E.style(type='text/css', 'html::-webkit-scrollbar, body::-webkit-scrollbar { display: none !important }')) # prevent flash of unstyled text during loading, showing
# a blank background instead
document.body.appendChild(E.div(
'\xa0',
style=f'position: absolute; z-index: 2147483647; width: 10000vw; height: 10000vh; background-color: {opts.color_scheme.background}',
E.style(type='text/css', 'html::-webkit-scrollbar, body::-webkit-scrollbar { display: none !important }')
))
# Default stylesheet # Default stylesheet
if not runtime.is_standalone_viewer: if not runtime.is_standalone_viewer:
# for the standalone viewer the default font family is set # for the standalone viewer the default font family is set