add state to switch tools, and keyboard shortcuts to do so

package.json

@@ -49,6 +49,7 @@
     "react": "15.5.4",
     "react-dom": "15.5.4",
     "react-intl": "2.3.0",
+    "react-redux": "5.0.5",
     "redux": "3.6.0",
     "redux-throttle": "0.1.1",
     "rimraf": "^2.6.1",

src/components/paint-editor.jsx

@@ -1,13 +1,18 @@
+import PropTypes from 'prop-types';
 import React from 'react';
-import PaperCanvas from './paper-canvas.jsx';
+import PaperCanvas from '../containers/paper-canvas.jsx';
 
-export default class PaintEditorComponent extends React.Component {
-    render () {
-        return (
-            <PaperCanvas />
-        );
-    }
-}
+const PaintEditorComponent = props => (
+    <PaperCanvas
+        tool={props.tool}
+    />
+);
 
-PaintEditorComponent.defaultProps = {
+PaintEditorComponent.propTypes = {
+    tool: PropTypes.shape({
+        name: PropTypes.string.isRequired
+    })
 };
+
+
+module.exports = PaintEditorComponent;

src/containers/paint-editor.jsx

@@ -0,0 +1,48 @@
+import PropTypes from 'prop-types';
+import React from 'react';
+import PaintEditorComponent from '../components/paint-editor.jsx';
+import tools from '../reducers/tools';
+import ToolTypes from '../tools/tool-types.js';
+import {connect} from 'react-redux';
+
+class PaintEditor extends React.Component {
+    componentDidMount () {
+        const onKeyPress = this.props.onKeyPress;
+        document.onkeydown = function (e) {
+            e = e || window.event;
+            onKeyPress(e);
+        };
+    }
+    render () {
+        return (
+            <PaintEditorComponent
+                tool={this.props.tool}
+            />
+        );
+    }
+}
+
+PaintEditor.propTypes = {
+    onKeyPress: PropTypes.func.isRequired,
+    tool: PropTypes.shape({
+        name: PropTypes.string.isRequired
+    })
+};
+
+const mapStateToProps = state => ({
+    tool: state.tool
+});
+const mapDispatchToProps = dispatch => ({
+    onKeyPress: e => {
+        if (e.key === 'e') {
+            dispatch(tools.changeTool(ToolTypes.ERASER));
+        } else if (e.key === 'b') {
+            dispatch(tools.changeTool(ToolTypes.BRUSH));
+        }
+    }
+});
+
+module.exports = connect(
+    mapStateToProps,
+    mapDispatchToProps
+)(PaintEditor);

src/containers/paper-canvas.jsx

@@ -1,5 +1,7 @@
+import PropTypes from 'prop-types';
 import React from 'react';
 import paper from 'paper';
+import ToolTypes from '../tools/tool-types.js';
 
 class PaperCanvas extends React.Component {
     constructor (props) {
@@ -22,6 +24,11 @@ class PaperCanvas extends React.Component {
         // Draw the view now:
         paper.view.draw();
     }
+    componentWillReceiveProps (nextProps) {
+        if (nextProps.tool !== this.props.tool && nextProps.tool instanceof ToolTypes) {
+            // TODO switch tool
+        }
+    }
     componentWillUnmount () {
     }
     render () {
@@ -31,6 +38,10 @@ class PaperCanvas extends React.Component {
     }
 }
 
-PaperCanvas.propTypes = {};
+PaperCanvas.propTypes = {
+    tool: PropTypes.shape({
+        name: PropTypes.string.isRequired
+    })
+};
 
 module.exports = PaperCanvas;

src/index.js

@@ -1,3 +1,3 @@
-import PaintEditorComponent from './components/paint-editor.jsx';
+import PaintEditor from './containers/paint-editor.jsx';
 
-export {PaintEditorComponent as default};
+export {PaintEditor as default};

src/playground/playground.jsx

@@ -1,9 +1,21 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
 import PaintEditor from '..';
+import {Provider} from 'react-redux';
+import {createStore, applyMiddleware} from 'redux';
+import throttle from 'redux-throttle';
+import reducer from '../reducers/combine-reducers';
 
 const appTarget = document.createElement('div');
 document.body.appendChild(appTarget);
-ReactDOM.render(
-    <PaintEditor />,
-    appTarget);
+const store = applyMiddleware(
+    throttle(300, {leading: true, trailing: true})
+)(createStore)(
+    reducer,
+    window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__()
+);
+ReactDOM.render((
+    <Provider store={store}>
+        <PaintEditor />
+    </Provider>
+), appTarget);

src/reducers/combine-reducers.js

@@ -0,0 +1,5 @@
+import {combineReducers} from 'redux';
+
+module.exports = combineReducers({
+    tool: require('./tools')
+});

src/reducers/tools.js

@@ -0,0 +1,32 @@
+import ToolTypes from '../tools/tool-types.js';
+
+const CHANGE_TOOL = 'scratch-paint/tools/CHANGE_TOOL';
+const initialState = ToolTypes.BRUSH;
+
+const reducer = function (state, action) {
+    if (typeof state === 'undefined') state = initialState;
+    switch (action.type) {
+    case CHANGE_TOOL:
+        if (action.tool instanceof ToolTypes) {
+            return action.tool;
+        }
+        // TODO switch to minilog
+        console.warn('Warning: Tool type does not exist: ${action.tool}');
+        /* falls through */
+    default:
+        return state;
+    }
+};
+
+// Action creators ==================================
+reducer.changeTool = function (tool) {
+    return {
+        type: CHANGE_TOOL,
+        tool: tool,
+        meta: {
+            throttle: 30
+        }
+    };
+};
+
+module.exports = reducer;

src/tools/tool-types.js

@@ -0,0 +1,12 @@
+class ToolTypes {
+    constructor (name) {
+        this.name = name;
+    }
+    toString () {
+        return `ToolTypes.${this.name}`;
+    }
+}
+ToolTypes.BRUSH = new ToolTypes('BRUSH');
+ToolTypes.ERASER = new ToolTypes('ERASER');
+
+module.exports = ToolTypes;