Class: Preact::State

Inherits:
Object show all
Includes:
Native::Wrapper
Defined in:
lib/preact/state.rb

Instance Method Summary collapse

Constructor Details

#initialize(native) ⇒ State

Returns a new instance of State.



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# File 'lib/preact/state.rb', line 5

def initialize(native)
  @native = native
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(key, *args, &block) ⇒ Object 



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# File 'lib/preact/state.rb', line 36

def method_missing(key, *args, &block)
  if `args.length > 0`
    new_state = `{}`
    new_state.JS[(`key.endsWith('=')` ? key.chop : key)] = args[0]
    if block_given?
      @native.JS.setState(new_state, `function() { block.$call(); }`)
    else
      @native.JS.setState(new_state, `null`)
    end
  else
    %x{
      if (typeof #@native.state[key] === 'undefined') { return nil; }
      return #@native.state[key];
    }
  end
end

Instance Method Details

#==(other_state) ⇒ Object 



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# File 'lib/preact/state.rb', line 9

def ==(other_state)
  %x{
    if (Opal.Preact.state_is_not_equal(#@native.state, #{other_state.to_raw_n})) { return false; }
    return true;
  }
end

#[](key) ⇒ Object 



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# File 'lib/preact/state.rb', line 16

def [](key)
  %x{
    if (typeof #@native.state[key] === 'undefined') { return nil; }
    return #@native.state[key];
  }
end

#[]=(key) ⇒ Object 



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# File 'lib/preact/state.rb', line 23

def []=(key)
  new_state = `{}`
  new_state.JS[(`key.endsWith('=')` ? key.chop : key)] = args[0]
  @native.JS.setState(new_state, `null`)
end

#key?(k) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/preact/state.rb', line 29

def key?(k)
  %x{
    if (typeof #@native.state[k] !== 'undefined') { return true; }
    return false;
  }
end

#set_state(updater, &block) ⇒ Object 



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# File 'lib/preact/state.rb', line 53

def set_state(updater, &block)
  new_state = `{}`
  updater.each do |key, value|
    new_state.JS[key] = value
  end
  if block_given?
    @native.JS.setState(new_state, `function() { block.$call(); }`)
  else
    @native.JS.setState(new_state, `null`)
  end
end

#size ⇒ Object 



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# File 'lib/preact/state.rb', line 65

def size
  `Object.keys(#@native.state).length`;
end

#to_n ⇒ Object 



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# File 'lib/preact/state.rb', line 69

def to_n
  %x{
    var new_native = {};
    for (var key in #@native.state) {
      if (typeof #@native.state[key].$to_n !== "undefined") {
        new_native[key] = #@native.state[key].$to_n();
      } else {
        new_native[key] = #@native.state[key];
      }
    }
    return new_native;
  }
end

#to_raw_n ⇒ Object 



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# File 'lib/preact/state.rb', line 83

def to_raw_n
  `#@native.state`
end