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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.
#include "chrome/browser/preloading/preview/preview_zoom_controller.h"
#include "base/metrics/histogram_functions.h"
#include "components/zoom/page_zoom.h"
#include "components/zoom/zoom_controller.h"
#include "content/public/browser/host_zoom_map.h"
#include "content/public/browser/navigation_handle.h"
#include "net/base/url_util.h"
#include "third_party/blink/public/common/page/page_zoom.h"
namespace {
PreviewZoomController::ZoomUsage TransiteZoomUsage(
double default_zoom_level,
PreviewZoomController::ZoomUsage current_zoom_usage,
double next_zoom_level) {
switch (current_zoom_usage) {
case PreviewZoomController::ZoomUsage::kOnlyDefaultUsed:
if (next_zoom_level == default_zoom_level) {
return PreviewZoomController::ZoomUsage::kOnlyDefaultUsed;
}
return PreviewZoomController::ZoomUsage::kNonDefaultUsed;
case PreviewZoomController::ZoomUsage::kNonDefaultUsed:
return PreviewZoomController::ZoomUsage::kNonDefaultUsed;
}
}
} // namespace
PreviewZoomController::PreviewZoomController(content::WebContents* web_contents)
: content::WebContentsObserver(web_contents) {}
PreviewZoomController::~PreviewZoomController() {
MaybeReportMetrics();
}
void PreviewZoomController::DidFinishNavigation(
content::NavigationHandle* navigation_handle) {
// TODO(b:291842891): We will update zoom settings also at the preview
// navigation.
if (!navigation_handle->IsInPrimaryMainFrame() ||
!navigation_handle->HasCommitted()) {
return;
}
was_page_shown_ = true;
InitializeZoom();
}
void PreviewZoomController::InitializeZoom() {
auto* zoom_controller = zoom::ZoomController::FromWebContents(web_contents());
auto* host_zoom_map = content::HostZoomMap::GetForWebContents(web_contents());
CHECK(zoom_controller);
CHECK(host_zoom_map);
const GURL url = content::HostZoomMap::GetURLForWebContents(web_contents());
const std::string host = net::GetHostOrSpecFromURL(url);
// If a user changed zoom level for the host in this session, recover it.
// If not, use the default value.
const double level = host_zoom_map->GetZoomLevelForPreviewAndHost(host);
// ZoomController::DidFinishNavigation resets zoom mode via
// ResetZoomModeOnNavigationIfNeeded when a primary main frame navigation
// happens. So, we need to reset zoom mode every time.
zoom_controller->SetZoomMode(
zoom::ZoomController::ZoomMode::ZOOM_MODE_ISOLATED);
// Set temporary zoom level via ZoomMode::ZOOM_MODE_ISOLATED.
zoom_controller->SetZoomLevel(level);
zoom_usage_ = TransiteZoomUsage(zoom_controller->GetDefaultZoomLevel(),
zoom_usage_, level);
}
void PreviewZoomController::ResetZoomForActivation() {
// Reset zoom mode as default, as if the navigation has just happened.
auto* zoom_controller = zoom::ZoomController::FromWebContents(web_contents());
// If we change ZoomMode ZOOM_MODE_ISOLATED to ZOOM_MODE_DEFAULT,
// ZoomController::SetZoomMode uses persisted zoom level (not for preview) if
// exists, or temporary zoom level (and persist it) if not. To prevent wired
// behavior for the latter case, reset temporary zoom level before calling
// SetZoomMode.
const double level = zoom_controller->GetDefaultZoomLevel();
zoom_controller->SetZoomLevel(level);
zoom_controller->SetZoomMode(
zoom::ZoomController::ZoomMode::ZOOM_MODE_DEFAULT);
}
double GetNextZoomLevel(double default_zoom_level,
double current_zoom_level,
content::PageZoom zoom) {
// Mimic of PageZoom::Zoom.
std::vector<double> zoom_levels =
zoom::PageZoom::PresetZoomLevels(default_zoom_level);
switch (zoom) {
case content::PAGE_ZOOM_RESET:
return default_zoom_level;
case content::PAGE_ZOOM_OUT: {
auto begin = zoom_levels.crbegin();
auto end = zoom_levels.crend();
auto next =
std::upper_bound(begin, end, current_zoom_level, std::greater<>());
// If the next level is within epsilon of the current, keep going until
// we're taking a meaningful step.
while (next != end && blink::ZoomValuesEqual(*next, current_zoom_level)) {
++next;
}
if (next == end) {
--next;
}
return *next;
}
case content::PAGE_ZOOM_IN: {
auto begin = zoom_levels.cbegin();
auto end = zoom_levels.cend();
auto next = std::upper_bound(begin, end, current_zoom_level);
// If the next level is within epsilon of the current, keep going until
// we're taking a meaningful step.
while (next != end && blink::ZoomValuesEqual(*next, current_zoom_level)) {
++next;
}
if (next == end) {
--next;
}
return *next;
}
}
}
void PreviewZoomController::Zoom(content::PageZoom zoom) {
auto* zoom_controller = zoom::ZoomController::FromWebContents(web_contents());
auto* host_zoom_map = content::HostZoomMap::GetForWebContents(web_contents());
CHECK(zoom_controller);
CHECK(host_zoom_map);
const GURL url = content::HostZoomMap::GetURLForWebContents(web_contents());
const std::string host = net::GetHostOrSpecFromURL(url);
const double level = GetNextZoomLevel(
zoom_controller->GetDefaultZoomLevel(),
host_zoom_map->GetZoomLevelForPreviewAndHost(host), zoom);
// Set temporary zoom level via ZoomMode::ZOOM_MODE_ISOLATED.
zoom_controller->SetZoomLevel(level);
// Memorize it in memory.
host_zoom_map->SetZoomLevelForPreviewAndHost(host, level);
zoom_usage_ = TransiteZoomUsage(zoom_controller->GetDefaultZoomLevel(),
zoom_usage_, level);
}
void PreviewZoomController::MaybeReportMetrics() {
if (!was_page_shown_) {
return;
}
base::UmaHistogramEnumeration("LinkPreview.Experimental.ZoomUsage",
zoom_usage_);
}
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