Index: content/public/common/page_zoom.cc |
=================================================================== |
--- content/public/common/page_zoom.cc (revision 0) |
+++ content/public/common/page_zoom.cc (revision 0) |
@@ -0,0 +1,73 @@ |
+// Copyright (c) 2011 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 <cmath> |
+ |
+#include "content/public/common/page_zoom.h" |
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h" |
+ |
+namespace content { |
+ |
+enum PageZoomValueType { |
+ PAGE_ZOOM_VALUE_TYPE_FACTOR, |
+ PAGE_ZOOM_VALUE_TYPE_LEVEL, |
+}; |
+ |
+const double kMinimumZoomFactor = 0.25; |
+const double kMaximumZoomFactor = 5.0; |
+ |
+const double kPresetZoomFactors[] = { 0.25, 0.333, 0.5, 0.666, 0.75, 0.9, 1.0, |
jam
2011/11/21 18:24:39
these preset values are all chrome-specific. other
csilv
2011/11/21 21:44:58
Done (relocated to chrome/browser as recommended).
|
+ 1.1, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 4.0, |
+ 5.0 }; |
+ |
+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 < arraysize(kPresetZoomFactors); i++) { |
+ double zoom_value = content::kPresetZoomFactors[i]; |
+ if (value_type == PAGE_ZOOM_VALUE_TYPE_LEVEL) |
+ zoom_value = WebKit::WebView::zoomFactorToZoomLevel(zoom_value); |
+ if (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(kMinimumZoomFactor) : |
+ kMinimumZoomFactor; |
+ double max = value_type == PAGE_ZOOM_VALUE_TYPE_LEVEL ? |
+ WebKit::WebView::zoomFactorToZoomLevel(kMaximumZoomFactor) : |
+ 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); |
+} |
+ |
+bool ZoomValuesEqual(double value_a, double value_b) { |
+ // Epsilon value for comparing two floating-point zoom values. We don't use |
+ // std::numeric_limits<> because it is too precise for zoom values. Zoom |
+ // values loose precision due to factor/level conversions. A value of 0.001 |
+ // is precise enough for zoom value comparisons. |
+ const double epsilon = 0.001; |
+ |
+ return (std::fabs(value_a - value_b) <= epsilon); |
+} |
+ |
+} // namespace content |
+ |
Property changes on: content/public/common/page_zoom.cc |
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Added: svn:eol-style |
+ LF |