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1 #pragma once
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2
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3 namespace fb2k {
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4 // callback_merit_t controls in what order callbacks are executed. \n
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5 // In specific corner cases, you want your callback executed before other callbacks of the same kind.
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6 typedef double callback_merit_t;
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7
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8 // Note REVERSE sort. HIGHER merit called first.
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9 static constexpr callback_merit_t callback_merit_default = 0;
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10 static constexpr callback_merit_t callback_merit_indexer = 1000; // indexer: does nothing else than updating internal state, called early before UI updates, in case UI updates might rely on indexed data.
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11 static constexpr callback_merit_t callback_merit_serializer = 2000; // serializer: does nothing else than saving new state, called early.
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12
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13 //! Special class that can be optionally implemented by 'static' callbacks, such as library_callback, to control callback merit. \n
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14 //! See also: callback_merit_t \n
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15 //! Some callback classes support get_callback_merit() natively, such as metadb_io_callback_v2. \n
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16 //! With callbacks registered dynamically, other means of controlling merit are provided.
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17 class callback_with_merit : public service_base {
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18 FB2K_MAKE_SERVICE_INTERFACE(callback_with_merit, service_base);
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19 public:
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20 virtual callback_merit_t get_callback_merit() = 0;
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21 };
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22
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23 callback_merit_t callback_merit_of(service_ptr obj);
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24 } |
