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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PRELOADING_PREVIEW_PREVIEW_ZOOM_CONTROLLER_H_
#define CHROME_BROWSER_PRELOADING_PREVIEW_PREVIEW_ZOOM_CONTROLLER_H_
#include "content/public/browser/web_contents_observer.h"
#include "content/public/common/page_zoom.h"
namespace content {
class WebContents;
} // namespace content
// Preview-specific zoom controller
//
// PreviewZoomController manages per-host zoom levels, applies it to previewed
// page, and updates it via user actions. Unlike ZoomController, zoom levels are
// durable in a session and not persisted to prefs.
//
// Note that this is a short-term solution. For more details, see the discussion
// https://docs.google.com/document/d/1FS6uOrm8mxupSVVCWA5f4qwcAiZA8YsFEQwBWo0lKkk/edit?resourcekey=0-iASeiM5hicof70TpiAue6g&disco=AAAA-uh-FqQ
// TODO(b:315313138): Revisit it later.
//
// The call of ZoomController::DidFinishNavigation must be followed by
// PreviewZoomController::DidFinishNavigation to reset zoom mode and update zoom
// level for a page correctly. To ensure this, the creation of ZoomController
// must be followed by the one of PreviewZoomController, because the observer
// invocation order depends on its registration order.
class PreviewZoomController final : public content::WebContentsObserver {
public:
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class ZoomUsage {
// A preview was started with default zoom level and not changed.
kOnlyDefaultUsed = 0,
// A preview was shown with non default zoom level in some timing in a
// preview lifecycle.
kNonDefaultUsed = 1,
kMaxValue = kNonDefaultUsed,
};
explicit PreviewZoomController(content::WebContents* web_contents);
~PreviewZoomController() override;
void ResetZoomForActivation();
void Zoom(content::PageZoom zoom);
private:
// content::WebContentsObserver
void DidFinishNavigation(
content::NavigationHandle* navigation_handle) override;
void InitializeZoom();
void MaybeReportMetrics();
bool was_page_shown_ = false;
ZoomUsage zoom_usage_ = ZoomUsage::kOnlyDefaultUsed;
};
#endif // CHROME_BROWSER_PRELOADING_PREVIEW_PREVIEW_ZOOM_CONTROLLER_H_
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