65 lines
2.8 KiB
C++
65 lines
2.8 KiB
C++
// Copyright 2024 The Chromium Embedded Framework Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be found
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// in the LICENSE file.
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#ifndef CEF_LIBCEF_BROWSER_VIEWS_COLOR_PROVIDER_TRACKER_H_
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#define CEF_LIBCEF_BROWSER_VIEWS_COLOR_PROVIDER_TRACKER_H_
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#pragma once
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#include "base/memory/raw_ptr.h"
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#include "base/scoped_observation.h"
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#include "ui/color/color_provider_manager.h"
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// Color registrations are managed by the global ColorProviderManager object.
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// When the system theme changes (e.g. NativeThemeWin::UpdateDarkModeStatus or
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// NativeThemeWin::OnSysColorChange is called) all existing platform NativeTheme
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// objects (NativeTheme[Win|Mac|Gtk]) are notified. They then call
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// NativeTheme::NotifyOnNativeThemeUpdated which calls
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// ColorProviderManager::ResetColorProviderCache, followed by
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// OnNativeThemeUpdated for each registered Widget, followed by
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// ColorProviderManager::AfterNativeThemeUpdated. The problem is that Chromium
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// creates multiple NativeTheme objects but each Widget only registers as an
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// Observer for the one returned via Widget::GetNativeTheme. If a different
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// NativeTheme is the last caller of ResetColorProviderCache then we don't get
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// an opportunity to reapply global color overrides in the Widget's
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// OnNativeThemeChanged callback. To work around this problem each Widget owns a
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// Tracker object. The Tracker explicitly registers as an Observer on the
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// ColorProviderManager to get callbacks from ResetColorProviderCache and
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// AfterNativeThemeUpdated. If OnNativeThemeUpdated is not called for the Widget
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// (which otherwise forwards the call to the Tracker) then the Tracker will call
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// OnColorProviderCacheResetMissed from OnAfterNativeThemeUpdated.
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class CefColorProviderTracker : public ui::ColorProviderManagerObserver {
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public:
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class Observer {
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public:
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// Called when the color provider cache is reset without a follow-up call to
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// OnNativeThemeUpdated.
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virtual void OnColorProviderCacheResetMissed() {}
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protected:
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virtual ~Observer() = default;
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};
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explicit CefColorProviderTracker(Observer* observer);
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CefColorProviderTracker(const CefColorProviderTracker&) = delete;
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CefColorProviderTracker& operator=(const CefColorProviderTracker&) = delete;
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// Notify us when OnNativeThemeUpdated is called.
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void OnNativeThemeUpdated();
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private:
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// ui::ColorProviderManagerObserver methods:
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void OnColorProviderCacheReset() override;
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void OnAfterNativeThemeUpdated() override;
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const raw_ptr<Observer> observer_;
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bool got_theme_updated_ = false;
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base::ScopedObservation<ui::ColorProviderManager,
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ui::ColorProviderManagerObserver>
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color_provider_observation_{this};
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};
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#endif // CEF_LIBCEF_BROWSER_VIEWS_COLOR_PROVIDER_TRACKER_H_
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