text: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_
  #define CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_
  
  #include <map>
  #include <string>
  #include <tuple>
  #include <vector>
  
  #include "base/compiler_specific.h"
  #include "base/macros.h"
  #include "base/sequenced_task_runner_helpers.h"
  #include "content/public/browser/host_zoom_map.h"
  
  namespace content {
  
  class WebContentsImpl;
  
  // HostZoomMap lives on the UI thread.
  class CONTENT_EXPORT HostZoomMapImpl : public HostZoomMap {
   public:
    HostZoomMapImpl();
    ~HostZoomMapImpl() override;
  
    // HostZoomMap implementation:
    void SetPageScaleFactorIsOneForView(
        int render_process_id, int render_view_id, bool is_one) override;
    void ClearPageScaleFactorIsOneForView(
        int render_process_id, int render_view_id) override;
    void CopyFrom(HostZoomMap* copy) override;
    double GetZoomLevelForHostAndScheme(const std::string& scheme,
                                        const std::string& host) const override;
    // TODO(wjmaclean) Should we use a GURL here? crbug.com/384486
    bool HasZoomLevel(const std::string& scheme,
                      const std::string& host) const override;
    ZoomLevelVector GetAllZoomLevels() const override;
    void SetZoomLevelForHost(const std::string& host, double level) override;
    void InitializeZoomLevelForHost(const std::string& host,
                                    double level,
                                    base::Time last_modified) override;
    void SetZoomLevelForHostAndScheme(const std::string& scheme,
                                      const std::string& host,
                                      double level) override;
    bool UsesTemporaryZoomLevel(int render_process_id,
                                int render_view_id) const override;
    void SetTemporaryZoomLevel(int render_process_id,
                               int render_view_id,
                               double level) override;
    void ClearZoomLevels(base::Time delete_begin, base::Time delete_end) override;
    void ClearTemporaryZoomLevel(int render_process_id,
                                 int render_view_id) override;
    double GetDefaultZoomLevel() const override;
    void SetDefaultZoomLevel(double level) override;
    std::unique_ptr<Subscription> AddZoomLevelChangedCallback(
        const ZoomLevelChangedCallback& callback) override;
  
    // Returns the current zoom level for the specified WebContents. This may
    // be a temporary zoom level, depending on UsesTemporaryZoomLevel().
    double GetZoomLevelForWebContents(
        const WebContentsImpl& web_contents_impl) const;
  
    bool PageScaleFactorIsOneForWebContents(
        const WebContentsImpl& web_contents_impl) const;
  
    // Sets the zoom level for this WebContents. If this WebContents is using
    // a temporary zoom level, then level is only applied to this WebContents.
    // Otherwise, the level will be applied on a host level.
    void SetZoomLevelForWebContents(const WebContentsImpl& web_contents_impl,
                                    double level);
  
    // Sets the zoom level for the specified view. The level may be set for only
    // this view, or for the host, depending on UsesTemporaryZoomLevel().
    void SetZoomLevelForView(int render_process_id,
                             int render_view_id,
                             double level,
                             const std::string& host);
  
    // Returns the temporary zoom level that's only valid for the lifetime of
    // the given WebContents (i.e. isn't saved and doesn't affect other
    // WebContentses) if it exists, the default zoom level otherwise.
    double GetTemporaryZoomLevel(int render_process_id,
                                 int render_view_id) const;
  
    // Returns the zoom level regardless of whether it's temporary, host-keyed or
    // scheme+host-keyed.
    double GetZoomLevelForView(const GURL& url,
                               int render_process_id,
                               int render_view_id) const;
  
    void SendErrorPageZoomLevelRefresh();
  
    void WillCloseRenderView(int render_process_id, int render_view_id);
  
    void SetClockForTesting(base::Clock* clock) override;
  
   private:
    struct ZoomLevel {
      double level;
      base::Time last_modified;
    };
    typedef std::map<std::string, ZoomLevel> HostZoomLevels;
    typedef std::map<std::string, HostZoomLevels> SchemeHostZoomLevels;
  
    struct RenderViewKey {
      int render_process_id;
      int render_view_id;
      RenderViewKey(int render_process_id, int render_view_id)
          : render_process_id(render_process_id),
            render_view_id(render_view_id) {}
      bool operator<(const RenderViewKey& other) const {
        return std::tie(render_process_id, render_view_id) <
               std::tie(other.render_process_id, other.render_view_id);
      }
    };
  
    typedef std::map<RenderViewKey, double> TemporaryZoomLevels;
    typedef std::map<RenderViewKey, bool> ViewPageScaleFactorsAreOne;
  
    double GetZoomLevelForHost(const std::string& host) const;
  
    // Set a zoom level for |host| and store the |last_modified| timestamp.
    // Use only to explicitly set a timestamp.
    void SetZoomLevelForHostInternal(const std::string& host,
                                     double level,
                                     base::Time last_modified);
  
    // Notifies the renderers from this browser context to change the zoom level
    // for the specified host and scheme.
    // TODO(wjmaclean) Should we use a GURL here? crbug.com/384486
    void SendZoomLevelChange(const std::string& scheme,
                             const std::string& host,
                             double level);
  
    // Callbacks called when zoom level changes.
    base::CallbackList<void(const ZoomLevelChange&)>
        zoom_level_changed_callbacks_;
  
    // Copy of the pref data.
    HostZoomLevels host_zoom_levels_;
    SchemeHostZoomLevels scheme_host_zoom_levels_;
    double default_zoom_level_;
  
    // Page scale factor data for each renderer.
    ViewPageScaleFactorsAreOne view_page_scale_factors_are_one_;
  
    TemporaryZoomLevels temporary_zoom_levels_;
  
    base::Clock* clock_;
  
    DISALLOW_COPY_AND_ASSIGN(HostZoomMapImpl);
  };
  
  }  // namespace content
  
  #endif  // CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_
  