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// 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.
#include "chrome/browser/chrome_page_zoom.h"
#include <algorithm>
#include <cmath>
#include "chrome/browser/chrome_page_zoom_constants.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/user_metrics.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/renderer_preferences.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
using content::UserMetricsAction;
namespace chrome_page_zoom {
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;
bool found_custom = false;
for (size_t i = 0; i < kPresetZoomFactorsSize; i++) {
double zoom_value = kPresetZoomFactors[i];
if (value_type == PAGE_ZOOM_VALUE_TYPE_LEVEL)
zoom_value = WebKit::WebView::zoomFactorToZoomLevel(zoom_value);
if (content::ZoomValuesEqual(zoom_value, custom_value))
found_custom = true;
zoom_values.push_back(zoom_value);
}
// If the preset array did not contain the custom value, append it to the
// vector and then sort.
double min = value_type == PAGE_ZOOM_VALUE_TYPE_LEVEL ?
WebKit::WebView::zoomFactorToZoomLevel(content::kMinimumZoomFactor) :
content::kMinimumZoomFactor;
double max = value_type == PAGE_ZOOM_VALUE_TYPE_LEVEL ?
WebKit::WebView::zoomFactorToZoomLevel(content::kMaximumZoomFactor) :
content::kMaximumZoomFactor;
if (!found_custom && custom_value > min && custom_value < max) {
zoom_values.push_back(custom_value);
std::sort(zoom_values.begin(), zoom_values.end());
}
return zoom_values;
}
std::vector<double> PresetZoomFactors(double custom_factor) {
return PresetZoomValues(PAGE_ZOOM_VALUE_TYPE_FACTOR, custom_factor);
}
std::vector<double> PresetZoomLevels(double custom_level) {
return PresetZoomValues(PAGE_ZOOM_VALUE_TYPE_LEVEL, custom_level);
}
void Zoom(content::WebContents* web_contents, content::PageZoom zoom) {
content::RenderViewHost* host = web_contents->GetRenderViewHost();
double current_zoom_level = web_contents->GetZoomLevel();
double default_zoom_level =
Profile::FromBrowserContext(web_contents->GetBrowserContext())->
GetPrefs()->GetDouble(prefs::kDefaultZoomLevel);
if (zoom == content::PAGE_ZOOM_RESET) {
host->SetZoomLevel(default_zoom_level);
content::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) {
// Iterate through the zoom levels in reverse order to find the next
// lower level based on the current zoom level for this page.
for (std::vector<double>::reverse_iterator i = zoom_levels.rbegin();
i != zoom_levels.rend(); ++i) {
double zoom_level = *i;
if (content::ZoomValuesEqual(zoom_level, current_zoom_level))
continue;
if (zoom_level < current_zoom_level) {
host->SetZoomLevel(zoom_level);
content::RecordAction(UserMetricsAction("ZoomMinus"));
return;
}
content::RecordAction(UserMetricsAction("ZoomMinus_AtMinimum"));
}
} else {
// Iterate through the zoom levels in normal order to find the next
// higher level based on the current zoom level for this page.
for (std::vector<double>::const_iterator i = zoom_levels.begin();
i != zoom_levels.end(); ++i) {
double zoom_level = *i;
if (content::ZoomValuesEqual(zoom_level, current_zoom_level))
continue;
if (zoom_level > current_zoom_level) {
host->SetZoomLevel(zoom_level);
content::RecordAction(UserMetricsAction("ZoomPlus"));
return;
}
}
content::RecordAction(UserMetricsAction("ZoomPlus_AtMaximum"));
}
}
} // namespace chrome_page_zoom
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