class GirFFI::CallbackBase
Base module for callbacks and vfuncs. NOTE: Another option would be to derive this class from FFI::Function, allowing a more natural implementation of ::from_native, ::to_native and wrap.
Constants
- CALLBACKS
Public Class Methods
copy_value_to_pointer(value, pointer)
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# File lib/gir_ffi/callback_base.rb, line 68 def self.copy_value_to_pointer(value, pointer) pointer.put_pointer 0, to_native(value, nil) end
from(prc)
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Create Callback from a Proc. Makes sure arguments are properly wrapped, and the callback is stored to prevent garbage collection.
# File lib/gir_ffi/callback_base.rb, line 42 def self.from(prc) wrap_in_callback_args_mapper(prc).tap do |cb| store_callback cb end end
from_native(value, _context)
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# File lib/gir_ffi/callback_base.rb, line 15 def self.from_native(value, _context) return nil if !value || value.null? FFI::Function.new(gir_ffi_builder.return_ffi_type, gir_ffi_builder.argument_ffi_types, value) end
get_value_from_pointer(pointer, offset)
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# File lib/gir_ffi/callback_base.rb, line 72 def self.get_value_from_pointer(pointer, offset) from_native pointer.get_pointer(offset), nil end
native_type()
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# File lib/gir_ffi/callback_base.rb, line 11 def self.native_type FFI::Type::POINTER end
store_callback(prc)
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# File lib/gir_ffi/callback_base.rb, line 36 def self.store_callback(prc) CALLBACKS << prc end
to_ffi_type()
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# File lib/gir_ffi/callback_base.rb, line 56 def self.to_ffi_type self end
to_native(value, _context)
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# File lib/gir_ffi/callback_base.rb, line 21 def self.to_native(value, _context) case value when CallbackBase value.to_native when FFI::Function value end end
wrap(ptr)
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# File lib/gir_ffi/callback_base.rb, line 30 def self.wrap(ptr) from_native ptr, nil end
wrap_in_callback_args_mapper(prc)
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# File lib/gir_ffi/callback_base.rb, line 48 def self.wrap_in_callback_args_mapper(prc) return unless prc new do |*args| call_with_argument_mapping(prc, *args) end end
Public Instance Methods
to_native()
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# File lib/gir_ffi/callback_base.rb, line 60 def to_native @to_native ||= begin builder = self.class.gir_ffi_builder FFI::Function.new(builder.return_ffi_type, builder.argument_ffi_types, self) end end