components/ui/zoom/page_zoom.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_UI_ZOOM_PAGE_ZOOM_H_
   6 #define COMPONENTS_UI_ZOOM_PAGE_ZOOM_H_
   7
   8 #include <vector>
   9
  10 #include "base/macros.h"
  11 #include "content/public/common/page_zoom.h"
  12
  13 namespace content {
  14 class WebContents;
  15 }
  16
  17 namespace ui_zoom {
  18
  19 // This class provides a means of zooming pages according to a predetermined
  20 // set of zoom levels/factors. In future, the static methods in this class
  21 // can be made non-static, with PresetZoomX() being virtual, to allow clients
  22 // to create custom sets of zoom levels.
  23 class PageZoom {
  24  public:
  25   // Return a sorted vector of zoom factors. The vector will consist of preset
  26   // values along with a custom value (if the custom value is not already
  27   // represented.)
  28   static std::vector<double> PresetZoomFactors(double custom_factor);
  29
  30   // Return a sorted vector of zoom levels. The vector will consist of preset
  31   // values along with a custom value (if the custom value is not already
  32   // represented.)
  33   static std::vector<double> PresetZoomLevels(double custom_level);
  34
  35   // Adjusts the zoom level of |web_contents|.
  36   static void Zoom(content::WebContents* web_contents, content::PageZoom zoom);
  37
  38  private:
  39   // We don't expect (currently) to create instances of this class.
  40   PageZoom() {}
  41   DISALLOW_COPY_AND_ASSIGN(PageZoom);
  42 };
  43
  44 }  // namespace ui_zoom
  45
  46 #endif  // COMPONENTS_UI_ZOOM_PAGE_ZOOM_H_