Module: React::Component::NativeComponentConstructor

Defined in:
lib/react/component/native_component_constructor.rb

Class Method Summary collapse

Class Method Details

.extended(base) ⇒ Object

for should_component_update we apply ruby semantics for comparing props to do so, we convert the props to ruby hashes and then compare this makes sure, that for example rubys Nil object gets handled properly



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# File 'lib/react/component/native_component_constructor.rb', line 7

def self.extended(base)
  component_name = base.to_s
  # language=JS
  %x{
    base.react_component = class extends Opal.global.React.Component {
      constructor(props) {
        super(props);
        if (base.$default_state_defined()) {
          this.state = base.$state().$to_n();
        } else {
          this.state = {};
        };
        this.__ruby_instance = base.$new(this);
        var defined_refs = #{base.defined_refs};
        for (var ref in defined_refs) {
          if (defined_refs[ref] != null) {
            this[ref] = function(element) {
              element = Opal.React.native_element_or_component_to_ruby(element);
              #{`this.__ruby_instance`.instance_exec(`element`, &`defined_refs[ref]`)}
            }
            this[ref] = this[ref].bind(this);
          } else {
            this[ref] = Opal.global.React.createRef();
          }
        }
      }
      static get displayName() {
        return #{component_name};
      }
      static set displayName(new_name) {
        // dont do anything here except returning the set value
        return new_name;
      }
      render() {
        const oper = Opal.React;
        oper.render_buffer.push([]);
        // console.log("react component pushed", oper.render_buffer, oper.render_buffer.toString());
        oper.active_components.push(this);
        let block_result = #{`this.__ruby_instance`.instance_exec(&`base.render_block`)};
        if (block_result && block_result !== nil) { oper.render_block_result(block_result); }
        // console.log("react component popping", oper.render_buffer, oper.render_buffer.toString());
        oper.active_components.pop();
        let result = oper.render_buffer.pop();
        return (result.length === 1) ? result[0] : result;
      }
      shouldComponentUpdate(next_props, next_state) {
        if (base.should_component_update_block) {
          return #{!!`this.__ruby_instance`.instance_exec(React::Component::Props.new(`{props: next_props}`), React::Component::State.new(`{state: next_state }`), &`base.should_component_update_block`)};
        }
        let counter = 0;
        const this_props = this.props;
        for (var property in next_props) {
          counter++;
          if (next_props.hasOwnProperty(property)) {
            if (!this_props.hasOwnProperty(property)) { return true; };
            if (property === "children") { if (next_props.children !== this_props.children) { return true; }}
            else if (typeof next_props[property] === "object" && next_props[property] !== null && typeof next_props[property]['$!='] === "function" &&
                     typeof this_props[property] !== "undefined" && this_props[property] !== null ) {
              if (#{ !! (`next_props[property]` != `this_props[property]`) }) { return true; }
            } else if (next_props[property] !== this_props[property]) { return true; }
          }
        }
        if (counter !== Object.keys(this_props).length) { return true; }
        counter = 0;
        const this_state = this.state;
        for (var property in next_state) {
          counter++;
          if (next_state.hasOwnProperty(property)) {
            if (!this_state.hasOwnProperty(property)) { return true; };
            if (typeof next_state[property] === "object" && next_state[property] !== null && typeof next_state[property]['$!='] === "function" &&
                typeof this_state[property] !== "undefined" && this_state[property] !== null) {
              if (#{ !! (`next_state[property]` != `this_state[property]`) }) { return true }
            } else if (next_state[property] !== this_state[property]) { return true }
          }
        }
        if (counter !== Object.keys(this_state).length) { return true; }
        return false;
      }
      validateProp(props, propName, componentName) {
        try { base.$validate_prop(propName, props[propName]) }
        catch (e) { return new Error(componentName + " Error: prop validation failed: " + e.message); }
        return null;
      }
    }
  }
end