ppapi/cpp/dev/zoom_dev.h

   1 // Copyright (c) 2010 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 PPAPI_CPP_DEV_ZOOM_DEV_H_
   6 #define PPAPI_CPP_DEV_ZOOM_DEV_H_
   7
   8 #include <string>
   9
  10 #include "ppapi/c/dev/ppp_zoom_dev.h"
  11 #include "ppapi/cpp/instance_handle.h"
  12
  13 namespace pp {
  14
  15 class Instance;
  16
  17 // This class allows you to associate the PPP_Zoom_Dev and PPB_Zoom_Dev C-based
  18 // interfaces with an object. It associates itself with the given instance, and
  19 // registers as the global handler for handling the PPP_Zoom_Dev interface that
  20 // the browser calls.
  21 //
  22 // You would typically use this either via inheritance on your instance:
  23 //   class MyInstance : public pp::Instance, public pp::Zoom_Dev {
  24 //     class MyInstance() : pp::Zoom_Dev(this) {
  25 //     }
  26 //     ...
  27 //   };
  28 //
  29 // or by composition:
  30 //   class MyZoom : public pp::Zoom_Dev {
  31 //     ...
  32 //   };
  33 //
  34 //   class MyInstance : public pp::Instance {
  35 //     MyInstance() : zoom_(this) {
  36 //     }
  37 //
  38 //     MyZoom zoom_;
  39 //   };
  40 class Zoom_Dev {
  41  public:
  42   explicit Zoom_Dev(Instance* instance);
  43   virtual ~Zoom_Dev();
  44
  45   // PPP_Zoom_Dev functions exposed as virtual functions for you to
  46   // override.
  47   virtual void Zoom(double factor, bool text_only) = 0;
  48
  49   // PPB_Zoom_Def functions for you to call to report new zoom factor.
  50   void ZoomChanged(double factor);
  51   void ZoomLimitsChanged(double minimum_factor, double maximium_factor);
  52
  53  private:
  54   InstanceHandle associated_instance_;
  55 };
  56
  57 }  // namespace pp
  58
  59 #endif  // PPAPI_CPP_DEV_ZOOM_DEV_H_