122 lines
4 KiB
C++
122 lines
4 KiB
C++
// Copyright (c) 2017 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#ifndef ATOM_BROWSER_WEB_CONTENTS_ZOOM_CONTROLLER_H_
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#define ATOM_BROWSER_WEB_CONTENTS_ZOOM_CONTROLLER_H_
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#include <map>
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#include <string>
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#include "base/observer_list_types.h"
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#include "content/public/browser/host_zoom_map.h"
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#include "content/public/browser/web_contents_observer.h"
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#include "content/public/browser/web_contents_user_data.h"
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namespace atom {
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// Manages the zoom changes of WebContents.
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class WebContentsZoomController
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: public content::WebContentsObserver,
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public content::WebContentsUserData<WebContentsZoomController> {
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public:
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class Observer : public base::CheckedObserver {
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public:
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virtual void OnZoomLevelChanged(content::WebContents* web_contents,
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double level,
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bool is_temporary) {}
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virtual void OnZoomControllerWebContentsDestroyed() {}
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protected:
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~Observer() override {}
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};
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// Defines how zoom changes are handled.
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enum ZoomMode {
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// Results in default zoom behavior, i.e. zoom changes are handled
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// automatically and on a per-origin basis, meaning that other tabs
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// navigated to the same origin will also zoom.
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ZOOM_MODE_DEFAULT,
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// Results in zoom changes being handled automatically, but on a per-tab
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// basis. Tabs in this zoom mode will not be affected by zoom changes in
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// other tabs, and vice versa.
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ZOOM_MODE_ISOLATED,
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// Overrides the automatic handling of zoom changes. The |onZoomChange|
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// event will still be dispatched, but the page will not actually be zoomed.
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// These zoom changes can be handled manually by listening for the
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// |onZoomChange| event. Zooming in this mode is also on a per-tab basis.
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ZOOM_MODE_MANUAL,
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// Disables all zooming in this tab. The tab will revert to the default
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// zoom level, and all attempted zoom changes will be ignored.
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ZOOM_MODE_DISABLED,
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};
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explicit WebContentsZoomController(content::WebContents* web_contents);
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~WebContentsZoomController() override;
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void AddObserver(Observer* observer);
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void RemoveObserver(Observer* observer);
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void SetEmbedderZoomController(WebContentsZoomController* controller);
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// Methods for managing zoom levels.
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void SetZoomLevel(double level);
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double GetZoomLevel();
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void SetDefaultZoomFactor(double factor);
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double GetDefaultZoomFactor();
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void SetTemporaryZoomLevel(double level);
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bool UsesTemporaryZoomLevel();
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// Sets the zoom mode, which defines zoom behavior (see enum ZoomMode).
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void SetZoomMode(ZoomMode zoom_mode);
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void ResetZoomModeOnNavigationIfNeeded(const GURL& url);
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ZoomMode zoom_mode() const { return zoom_mode_; }
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// Convenience method to get default zoom level. Implemented here for
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// inlining.
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double GetDefaultZoomLevel() const {
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return content::HostZoomMap::GetForWebContents(web_contents())
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->GetDefaultZoomLevel();
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}
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protected:
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// content::WebContentsObserver:
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void DidFinishNavigation(content::NavigationHandle* handle) override;
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void WebContentsDestroyed() override;
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void RenderFrameHostChanged(content::RenderFrameHost* old_host,
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content::RenderFrameHost* new_host) override;
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private:
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friend class content::WebContentsUserData<WebContentsZoomController>;
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// Called after a navigation has committed to set default zoom factor.
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void SetZoomFactorOnNavigationIfNeeded(const GURL& url);
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// The current zoom mode.
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ZoomMode zoom_mode_ = ZOOM_MODE_DEFAULT;
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// Current zoom level.
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double zoom_level_ = 1.0;
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// kZoomFactor.
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double default_zoom_factor_ = 0;
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int old_process_id_ = -1;
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int old_view_id_ = -1;
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WebContentsZoomController* embedder_zoom_controller_ = nullptr;
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base::ObserverList<Observer> observers_;
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content::HostZoomMap* host_zoom_map_;
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WEB_CONTENTS_USER_DATA_KEY_DECL();
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DISALLOW_COPY_AND_ASSIGN(WebContentsZoomController);
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};
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} // namespace atom
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#endif // ATOM_BROWSER_WEB_CONTENTS_ZOOM_CONTROLLER_H_
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