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fix dark theme issue for plugin web dialog

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This commit is contained in:
SoftFever
2026-07-04 22:14:35 +08:00
parent 4e26e7233e
commit f47eee24d3
1 changed files with 21 additions and 11 deletions
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32
src/slic3r/GUI/PluginWebDialog.cpp
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@@ -80,22 +80,32 @@ std::string host_theme_style()
return s;
}
// User script that prepends the host theme into the document at document-start,
// before the plugin's own <style>/scripts run (and before first paint). Works
// whether the plugin page has a <head> or is a bare fragment.
// User script that prepends the host theme into the document, before the plugin's
// own <style>/scripts affect layout (and before first paint). Works whether the
// plugin page has a <head> or is a bare fragment.
std::string host_theme_user_script()
{
// JSON-encode the style so it is a safe JS string literal regardless of
// quotes/newlines it may contain.
const std::string style_literal = nlohmann::json(host_theme_style()).dump();
std::string js;
js += "(function(){";
js += "if(document.getElementById('orca-host-theme'))return;";
js += "var css=" + style_literal + ";";
js += "var head=document.head||document.documentElement;";
js += "head.insertAdjacentHTML('afterbegin',css);";
js += "})();";
return js;
// On WebView2 a document-start user script runs before <html> exists
// (document.head and document.documentElement are both null), so inserting
// right away would throw and the theme would silently never apply. Inject at
// the first opportunity instead: immediately when a root already exists,
// otherwise the moment <html> appears as a direct child of the observed
// document — still before first paint.
return "(function(){var css=" + style_literal + ";" R"JS(
function inject(){
var root=document.head||document.documentElement;
if(!root)return false;
if(!document.getElementById('orca-host-theme'))
root.insertAdjacentHTML('afterbegin',css);
return true;
}
if(inject())return;
var obs=new MutationObserver(function(){if(inject())obs.disconnect();});
obs.observe(document,{childList:true});
})();)JS";
}
// Injected into every page at document start (before the plugin's own scripts).