Class: HotCocoa::DelegateBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/hotcocoa/delegate_builder.rb

Overview

Builds a delegate for a control at runtime by creating a generic object and adding singleton methods for each given delegate method; it then tells the control to delegate to that created object.

Instance Attribute Summary (collapse)

Instance Method Summary (collapse)

Constructor Details

- (DelegateBuilder) initialize(control, required_methods)

A new instance of DelegateBuilder

Parameters:

  • control —

    the object which needs a delegate

  • required_methods (Array<SEL,String>) 


30
31
32
33
34
 
# File 'lib/hotcocoa/delegate_builder.rb', line 30

def initialize control, required_methods
  @control          = control
  @required_methods = required_methods
  @delegate         = Object.new
end

Instance Attribute Details

- (Object) control (readonly)

The object that needs a delegate

Returns:



13
14
15
 
# File 'lib/hotcocoa/delegate_builder.rb', line 13

def control
  @control
end

- (Object) delegate (readonly)

The delegate object

Returns:



26
27
28
 
# File 'lib/hotcocoa/delegate_builder.rb', line 26

def delegate
  @delegate
end

- (Array<SEL,String>) required_methods (readonly)

Delegate methods which are assumed to be implemented and therefore MUST be given at least a stub

Returns:

  • (Array<SEL,String>) 


20
21
22
 
# File 'lib/hotcocoa/delegate_builder.rb', line 20

def required_methods
  @required_methods
end

Instance Method Details

- (Object) add_delegated_method(block, selector_name, *parameters)

Add a delegated method for #control to #delegate



38
39
40
41
42
43
44
45
 
# File 'lib/hotcocoa/delegate_builder.rb', line 38

def add_delegated_method block, selector_name, *parameters
  clear_delegate if required_methods.empty?

  delegate_method_builder.add_delegated_method block, selector_name, *parameters

  required_methods.delete(selector_name)
  set_delegate if required_methods.empty?
end

- (Object) delegate_to(object, *method_names) 



47
48
49
50
51
 
# File 'lib/hotcocoa/delegate_builder.rb', line 47

def delegate_to object, *method_names
  method_names.each do |method_name|
    control.send(method_name, &object.method(method_name)) if object.respond_to?(method_name)
  end
end