src/ui/base/glib/glib_signal.h

   1 // Copyright (c) 2011 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 UI_BASE_GLIB_GLIB_SIGNAL_H_
   6 #define UI_BASE_GLIB_GLIB_SIGNAL_H_
   7
   8 typedef void* gpointer;
   9
  10 // At the time of writing this, there were two common ways of binding our C++
  11 // code to the gobject C system. We either defined a whole bunch of "static
  12 // MethodThunk()" which just called nonstatic Method()s on a class (which hurt
  13 // readability of the headers and signal connection code) OR we declared
  14 // "static Method()" and passed in the current object as the gpointer (and hurt
  15 // readability in the implementation by having "context->" before every
  16 // variable).
  17
  18 // The hopeful result of using these macros is that the code will be more
  19 // readable and regular. There shouldn't be a bunch of static Thunks visible in
  20 // the headers and the implementations shouldn't be filled with "context->"
  21 // de-references.
  22
  23 #define CHROMEG_CALLBACK_0(CLASS, RETURN, METHOD, SENDER)           \
  24   static RETURN METHOD ## Thunk(SENDER sender, gpointer userdata) { \
  25     return reinterpret_cast<CLASS*>(userdata)->METHOD(sender);      \
  26   }                                                                 \
  27                                                                     \
  28   RETURN METHOD(SENDER);
  29
  30 #define CHROMEG_CALLBACK_1(CLASS, RETURN, METHOD, SENDER, ARG1)     \
  31   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one,            \
  32                                 gpointer userdata) {                \
  33     return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one); \
  34   }                                                                 \
  35                                                                     \
  36   RETURN METHOD(SENDER, ARG1);
  37
  38 #define CHROMEG_CALLBACK_2(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2)    \
  39   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,       \
  40                                 gpointer userdata) {                     \
  41     return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two); \
  42   }                                                                      \
  43                                                                          \
  44   RETURN METHOD(SENDER, ARG1, ARG2);
  45
  46 #define CHROMEG_CALLBACK_3(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, ARG3) \
  47   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,          \
  48                                 ARG3 three, gpointer userdata) {            \
  49     return reinterpret_cast<CLASS*>(userdata)->                             \
  50         METHOD(sender, one, two, three);                                    \
  51   }                                                                         \
  52                                                                             \
  53   RETURN METHOD(SENDER, ARG1, ARG2, ARG3);
  54
  55 #define CHROMEG_CALLBACK_4(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, ARG3, \
  56                            ARG4)                                            \
  57   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,          \
  58                                 ARG3 three, ARG4 four,                      \
  59                                 gpointer userdata) {                        \
  60     return reinterpret_cast<CLASS*>(userdata)->                             \
  61         METHOD(sender, one, two, three, four);                              \
  62   }                                                                         \
  63                                                                             \
  64   RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4);
  65
  66 #define CHROMEG_CALLBACK_5(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, ARG3, \
  67                            ARG4, ARG5)                                      \
  68   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,          \
  69                                 ARG3 three, ARG4 four, ARG5 five,           \
  70                                 gpointer userdata) {                        \
  71     return reinterpret_cast<CLASS*>(userdata)->                             \
  72         METHOD(sender, one, two, three, four, five);                        \
  73   }                                                                         \
  74                                                                             \
  75   RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4, ARG5);
  76
  77 #define CHROMEG_CALLBACK_6(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, ARG3, \
  78                            ARG4, ARG5, ARG6)                                \
  79   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,          \
  80                                 ARG3 three, ARG4 four, ARG5 five,           \
  81                                 ARG6 six, gpointer userdata) {              \
  82     return reinterpret_cast<CLASS*>(userdata)->                             \
  83         METHOD(sender, one, two, three, four, five, six);                   \
  84   }                                                                         \
  85                                                                             \
  86   RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6);
  87
  88 #define CHROMEG_VIRTUAL_CALLBACK_0(CLASS, RETURN, METHOD, SENDER)   \
  89   static RETURN METHOD ## Thunk(SENDER sender, gpointer userdata) { \
  90     return reinterpret_cast<CLASS*>(userdata)->METHOD(sender);      \
  91   }                                                                 \
  92                                                                     \
  93   virtual RETURN METHOD(SENDER);
  94
  95 #define CHROMEG_VIRTUAL_CALLBACK_1(CLASS, RETURN, METHOD, SENDER, ARG1) \
  96   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one,                \
  97                                 gpointer userdata) {                    \
  98     return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one);     \
  99   }                                                                     \
 100                                                                         \
 101   virtual RETURN METHOD(SENDER, ARG1);
 102
 103 #define CHROMEG_VIRTUAL_CALLBACK_2(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2) \
 104   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,            \
 105                                 gpointer userdata) {                          \
 106     return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two);      \
 107   }                                                                           \
 108                                                                               \
 109   virtual RETURN METHOD(SENDER, ARG1, ARG2);
 110
 111 #define CHROMEG_VIRTUAL_CALLBACK_3(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, \
 112                                    ARG3)                                      \
 113   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,            \
 114                                 ARG3 three, gpointer userdata) {              \
 115     return reinterpret_cast<CLASS*>(userdata)->                               \
 116         METHOD(sender, one, two, three);                                      \
 117   }                                                                           \
 118                                                                               \
 119   virtual RETURN METHOD(SENDER, ARG1, ARG2, ARG3);
 120
 121 #define CHROMEG_VIRTUAL_CALLBACK_4(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, \
 122                                    ARG3, ARG4)                                \
 123   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,            \
 124                                 ARG3 three, ARG4 four,                        \
 125                                 gpointer userdata) {                          \
 126     return reinterpret_cast<CLASS*>(userdata)->                               \
 127         METHOD(sender, one, two, three, four);                                \
 128   }                                                                           \
 129                                                                               \
 130   virtual RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4);
 131
 132 #define CHROMEG_VIRTUAL_CALLBACK_5(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, \
 133                                    ARG3,  ARG4, ARG5)                         \
 134   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,            \
 135                                 ARG3 three, ARG4 four, ARG5 five,             \
 136                                 gpointer userdata) {                          \
 137     return reinterpret_cast<CLASS*>(userdata)->                               \
 138         METHOD(sender, one, two, three, four, five);                          \
 139   }                                                                           \
 140                                                                               \
 141   virtual RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4, ARG5);
 142
 143 #define CHROMEG_VIRTUAL_CALLBACK_6(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, \
 144                                    ARG3, ARG4, ARG5, ARG6)                    \
 145   static RETURN METHOD ## Thunk(SENDER sender, ARG1 one, ARG2 two,            \
 146                                 ARG3 three, ARG4 four, ARG5 five,             \
 147                                 ARG6 six, gpointer userdata) {                \
 148     return reinterpret_cast<CLASS*>(userdata)->                               \
 149         METHOD(sender, one, two, three, four, five, six);                     \
 150   }                                                                           \
 151                                                                               \
 152   virtual RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6);
 153
 154 #endif