style_sheets.cpp

   1 // Copyright 2005 Ben Hutchings <ben@decadentplace.org.uk>.
   2 // See the file "COPYING" for licence details.
   3
   4 #include "style_sheets.hpp"
   5
   6 #include <nsContentCID.h>
   7 #include <nsICSSLoader.h>
   8 #include <nsICSSStyleSheet.h>
   9 #include <nsIPresShell.h>
  10 #include <nsIServiceManagerUtils.h>
  11 #include <nsIURI.h>
  12 #include <nsNetUtil.h>
  13
  14 #include "xpcom_support.hpp"
  15
  16 using xpcom_support::check;
  17
  18 // Load a CSS from an (absolute) URI.
  19 // TODO: Support loading from an absolute, or better, relative filename.
  20 already_AddRefed<nsIStyleSheet> load_css(const char * uri)
  21 {
  22     nsCOMPtr<nsICSSLoader> css_loader;
  23     static const nsCID css_loader_cid = NS_CSS_LOADER_CID;
  24     check(CallGetService<nsICSSLoader>(css_loader_cid,
  25                                        getter_AddRefs(css_loader)));
  26
  27     nsCOMPtr<nsIURI> style_sheet_uri;
  28     check(NS_NewURI(getter_AddRefs(style_sheet_uri), nsCString(uri)));
  29
  30     nsICSSStyleSheet * style_sheet;
  31     check(css_loader->LoadAgentSheet(style_sheet_uri, &style_sheet));
  32     return style_sheet;
  33 }
  34
  35 // Apply a style-sheet to a given presentation shell as the top-priority
  36 // agent style-sheet and disable the preferences-derived style rules.
  37 void apply_style_sheet(nsIStyleSheet * style_sheet, nsIPresShell * pres_shell)
  38 {
  39     nsCOMArray<nsIStyleSheet> style_sheets;
  40     check(pres_shell->GetAgentStyleSheets(style_sheets));
  41     check(style_sheets.InsertObjectAt(style_sheet, 0));
  42     check(pres_shell->SetAgentStyleSheets(style_sheets));
  43
  44     check(pres_shell->EnablePrefStyleRules(false));
  45
  46     // Update the display
  47     check(pres_shell->ReconstructStyleData());
  48     check(pres_shell->FlushPendingNotifications(true));
  49 }
  50