64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef ATOM_BROWSER_ZOOM_LEVEL_DELEGATE_H_
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#define ATOM_BROWSER_ZOOM_LEVEL_DELEGATE_H_
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#include <memory>
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#include <string>
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#include "base/files/file_path.h"
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#include "base/macros.h"
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#include "components/prefs/pref_service.h"
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#include "content/public/browser/host_zoom_map.h"
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#include "content/public/browser/zoom_level_delegate.h"
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namespace base {
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class DictionaryValue;
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}
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class PrefRegistrySimple;
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namespace atom {
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// A class to manage per-partition default and per-host zoom levels.
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// It implements an interface between the content/ zoom
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// levels in HostZoomMap and preference system. All changes
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// to the per-partition default zoom levels flow through this
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// class. Any changes to per-host levels are updated when HostZoomMap calls
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// OnZoomLevelChanged.
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class ZoomLevelDelegate : public content::ZoomLevelDelegate {
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public:
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static void RegisterPrefs(PrefRegistrySimple* pref_registry);
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ZoomLevelDelegate(PrefService* pref_service,
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const base::FilePath& partition_path);
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~ZoomLevelDelegate() override;
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void SetDefaultZoomLevelPref(double level);
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double GetDefaultZoomLevelPref() const;
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// content::ZoomLevelDelegate:
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void InitHostZoomMap(content::HostZoomMap* host_zoom_map) override;
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private:
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void ExtractPerHostZoomLevels(
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const base::DictionaryValue* host_zoom_dictionary);
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// This is a callback function that receives notifications from HostZoomMap
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// when per-host zoom levels change. It is used to update the per-host
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// zoom levels (if any) managed by this class (for its associated partition).
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void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change);
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PrefService* pref_service_;
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content::HostZoomMap* host_zoom_map_;
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std::unique_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
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std::string partition_key_;
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DISALLOW_COPY_AND_ASSIGN(ZoomLevelDelegate);
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};
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} // namespace atom
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#endif // ATOM_BROWSER_ZOOM_LEVEL_DELEGATE_H_
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