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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/webui/theme_handler.h"
#include <memory>
#include "base/functional/bind.h"
#include "base/values.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/themes/theme_service.h"
#include "chrome/browser/themes/theme_service_factory.h"
#include "chrome/browser/ui/webui/theme_source.h"
#include "chrome/browser/ui/webui/webui_util_desktop.h"
#include "chrome/grit/theme_resources.h"
#include "content/public/browser/web_ui.h"
///////////////////////////////////////////////////////////////////////////////
// ThemeHandler
ThemeHandler::ThemeHandler() = default;
ThemeHandler::~ThemeHandler() {
ThemeServiceFactory::GetForProfile(GetProfile())->RemoveObserver(this);
}
void ThemeHandler::RegisterMessages() {
// These are not actual message registrations, but can't be done in the
// constructor since they need the web_ui value to be set, which is done
// post-construction, but before registering messages.
InitializeCSSCaches();
web_ui()->RegisterMessageCallback(
"observeThemeChanges",
base::BindRepeating(&ThemeHandler::HandleObserveThemeChanges,
base::Unretained(this)));
}
void ThemeHandler::OnJavascriptAllowed() {
// Listen for theme installation.
ThemeServiceFactory::GetForProfile(GetProfile())->AddObserver(this);
// Or native theme change.
if (web_ui()) {
theme_observation_.Observe(
webui::GetNativeThemeDeprecated(web_ui()->GetWebContents()));
}
}
void ThemeHandler::OnJavascriptDisallowed() {
ThemeServiceFactory::GetForProfile(GetProfile())->RemoveObserver(this);
theme_observation_.Reset();
}
void ThemeHandler::OnThemeChanged() {
SendThemeChanged();
}
void ThemeHandler::OnNativeThemeUpdated(ui::NativeTheme* observed_theme) {
// There are two types of theme update. a) The observed theme change. e.g.
// switch between light/dark mode. b) A different theme is enabled. e.g.
// switch between GTK and classic theme on Linux. Reset observer in case b).
ui::NativeTheme* current_theme =
webui::GetNativeThemeDeprecated(web_ui()->GetWebContents());
if (observed_theme != current_theme) {
theme_observation_.Reset();
theme_observation_.Observe(current_theme);
}
SendThemeChanged();
}
void ThemeHandler::HandleObserveThemeChanges(
const base::Value::List& /*args*/) {
AllowJavascript();
}
void ThemeHandler::SendThemeChanged() {
InitializeCSSCaches();
bool has_custom_bg = ThemeService::GetThemeProviderForProfile(GetProfile())
.HasCustomImage(IDR_THEME_NTP_BACKGROUND);
// TODO(dbeam): why does this need to be a dictionary?
base::Value::Dict dictionary;
dictionary.Set("hasCustomBackground", has_custom_bg);
FireWebUIListener("theme-changed", dictionary);
}
void ThemeHandler::InitializeCSSCaches() {
Profile* profile = GetProfile();
content::URLDataSource::Add(profile, std::make_unique<ThemeSource>(profile));
}
Profile* ThemeHandler::GetProfile() {
return Profile::FromWebUI(web_ui());
}
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