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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/zoom/page_zoom.h"
#include <stddef.h>
#include <algorithm>
#include <functional>
#include "base/metrics/user_metrics.h"
#include "components/zoom/page_zoom_constants.h"
#include "components/zoom/zoom_controller.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/page_zoom.h"
#include "third_party/blink/public/common/page/page_zoom.h"
using base::UserMetricsAction;
namespace {
enum PageZoomValueType {
PAGE_ZOOM_VALUE_TYPE_FACTOR,
PAGE_ZOOM_VALUE_TYPE_LEVEL,
};
std::vector<double> PresetZoomValues(PageZoomValueType value_type,
double custom_value) {
// Generate a vector of zoom values from an array of known preset
// factors. The values in content::kPresetZoomFactors will already be in
// sorted order.
std::vector<double> zoom_values;
zoom_values.reserve(zoom::kPresetZoomFactorsSize);
bool found_custom = false;
for (size_t i = 0; i < zoom::kPresetZoomFactorsSize; i++) {
double zoom_value = zoom::kPresetZoomFactors[i];
if (value_type == PAGE_ZOOM_VALUE_TYPE_LEVEL)
zoom_value = blink::PageZoomFactorToZoomLevel(zoom_value);
if (blink::PageZoomValuesEqual(zoom_value, custom_value))
found_custom = true;
zoom_values.push_back(zoom_value);
}
// If the preset array did not contain the custom value, insert the value
// while preserving the ordering.
double min = zoom_values.front();
double max = zoom_values.back();
if (!found_custom && custom_value > min && custom_value < max) {
zoom_values.insert(
std::upper_bound(zoom_values.begin(), zoom_values.end(), custom_value),
custom_value);
}
return zoom_values;
}
} // namespace anonymous
namespace zoom {
// static
std::vector<double> PageZoom::PresetZoomFactors(double custom_factor) {
return PresetZoomValues(PAGE_ZOOM_VALUE_TYPE_FACTOR, custom_factor);
}
// static
std::vector<double> PageZoom::PresetZoomLevels(double custom_level) {
return PresetZoomValues(PAGE_ZOOM_VALUE_TYPE_LEVEL, custom_level);
}
// static
void PageZoom::Zoom(content::WebContents* web_contents,
content::PageZoom zoom) {
zoom::ZoomController* zoom_controller =
zoom::ZoomController::FromWebContents(web_contents);
if (!zoom_controller)
return;
double current_zoom_level = zoom_controller->GetZoomLevel();
double default_zoom_level = zoom_controller->GetDefaultZoomLevel();
if (zoom == content::PAGE_ZOOM_RESET) {
zoom_controller->SetZoomLevel(default_zoom_level);
web_contents->SetPageScale(1.f);
base::RecordAction(UserMetricsAction("ZoomNormal"));
return;
}
// Generate a vector of zoom levels from an array of known presets along with
// the default level added if necessary.
std::vector<double> zoom_levels = PresetZoomLevels(default_zoom_level);
if (zoom == content::PAGE_ZOOM_OUT) {
// Find the zoom level that is next lower than the current level for this
// page.
auto next_lower = std::upper_bound(zoom_levels.rbegin(), zoom_levels.rend(),
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_lower != zoom_levels.rend() &&
blink::PageZoomValuesEqual(*next_lower, current_zoom_level)) {
++next_lower;
}
if (next_lower == zoom_levels.rend()) {
base::RecordAction(UserMetricsAction("ZoomMinus_AtMinimum"));
} else {
zoom_controller->SetZoomLevel(*next_lower);
base::RecordAction(UserMetricsAction("ZoomMinus"));
}
} else {
// Find the zoom level that is next higher than the current level for this
// page.
auto next_higher = std::upper_bound(zoom_levels.begin(), zoom_levels.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_higher != zoom_levels.end() &&
blink::PageZoomValuesEqual(*next_higher, current_zoom_level)) {
++next_higher;
}
if (next_higher == zoom_levels.end()) {
base::RecordAction(UserMetricsAction("ZoomPlus_AtMaximum"));
} else {
zoom_controller->SetZoomLevel(*next_higher);
base::RecordAction(UserMetricsAction("ZoomPlus"));
}
}
}
} // namespace zoom
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