module LucidComponent::NativeComponentConstructor

Public Class Methods

extended(base) click to toggle source

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

# File lib/isomorfeus_preact/lucid_component/native_component_constructor.rb, line 6
def self.extended(base)
  component_name = base.to_s
  wrapper_name = component_name + 'Wrapper'
  %x{
    base.css_styles = null;
    base.preload_block = null;
    base.while_loading_block = null;

    base.preact_component = function(props) {
      let value = Opal.global.PreactHooks.useContext(Opal.global.LucidApplicationContext);
      return Opal.global.Preact.createElement(base.lucid_preact_component, Object.assign({}, props, value));
    };
    base.preact_component.displayName = #{wrapper_name};
    
    base.lucid_preact_component = class extends Opal.global.Preact.Component {
      constructor(props) {
        super(props);
        const oper = Opal.Preact;
        if (base.$default_state_defined()) {
          this.state = base.$state().$to_n();
        } else {
          this.state = {};
        };
        this.__ruby_instance = base.$new(this);
        var defined_refs = base.$defined_refs();
        for (var ref in defined_refs) {
          if (defined_refs[ref] != null) {
            this[ref] = function(element) {
              element = oper.native_element_or_component_to_ruby(element);
              #{`this.__ruby_instance`.instance_exec(`element`, &`defined_refs[ref]`)}
            }
            this[ref] = this[ref].bind(this);
          } else {
            this[ref] = Opal.global.Preact.createRef();
          }
        }
        if (base.preload_block) {
          oper.active_redux_components.push(this);
          this.state.preloaded = this.__ruby_instance.$execute_preload_block();
          oper.active_redux_components.pop();
        }
      }
      static get displayName() {
        return #{component_name};
      }
      render(props, state) {
        const oper = Opal.Preact;
        oper.render_buffer.push([]);
        // console.log("lucid component pushed", oper.render_buffer, oper.render_buffer.toString());
        oper.active_components.push(this);
        oper.active_redux_components.push(this);
        let block_result;
        if (base.while_loading_block && !state.preloaded) { block_result = #{`this.__ruby_instance`.instance_exec(&`base.while_loading_block`)}; }
        else { block_result = #{`this.__ruby_instance`.instance_exec(&`base.render_block`)}; }
        if (block_result && block_result !== nil) { oper.render_block_result(block_result); }
        oper.active_redux_components.pop();
        oper.active_components.pop();
        // console.log("lucid component popping", oper.render_buffer, oper.render_buffer.toString());
        let result = oper.render_buffer.pop();
        return (result.length === 1) ? result[0] : result;
      }
      data_access() {
        return this.props.iso_store;
      }
      shouldComponentUpdate(next_props, next_state) {
        if (!Opal.Preact.props_are_equal(this.props, next_props)) { return true; }
        if (Opal.Preact.state_is_not_equal(this.state, next_state)) { 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