src/app/StateControl.hpp

   1 #ifndef BLANK_APP_STATECONTROL_HPP_
   2 #define BLANK_APP_STATECONTROL_HPP_
   3
   4 #include <queue>
   5
   6
   7 namespace blank {
   8
   9 class Application;
  10 class State;
  11
  12 class StateControl {
  13
  14 public:
  15         void Push(State *s) {
  16                 cue.emplace(PUSH, s);
  17         }
  18
  19         void Switch(State *s) {
  20                 cue.emplace(SWITCH, s);
  21         }
  22
  23         void Pop() {
  24                 cue.emplace(POP);
  25         }
  26
  27         void PopAll() {
  28                 cue.emplace(POP_ALL);
  29         }
  30
  31
  32         void Commit(Application &);
  33
  34 private:
  35         enum Command {
  36                 PUSH,
  37                 SWITCH,
  38                 POP,
  39                 POP_ALL,
  40         };
  41         struct Memo {
  42                 State *state;
  43                 Command cmd;
  44                 explicit Memo(Command c, State *s = nullptr): state(s), cmd(c) { }
  45         };
  46         std::queue<Memo> cue;
  47
  48 };
  49
  50 }
  51
  52 #endif