Refactor sidebar

app/src/components/Sidebar/TopicPanel/Topic.tsx

@@ -0,0 +1,73 @@
+import React from 'react'
+import * as q from '../../../../../backend/src/Model'
+import Button from '@material-ui/core/Button'
+import { withStyles, Theme } from '@material-ui/core/styles'
+import { treeActions } from '../../../actions'
+import { bindActionCreators } from 'redux'
+import { connect } from 'react-redux'
+import { TopicViewModel } from '../../../model/TopicViewModel'
+
+interface Props {
+  classes: any
+  theme: Theme
+  node?: q.TreeNode<TopicViewModel>
+  selected?: q.TreeNode<TopicViewModel>
+  actions: typeof treeActions
+  didSelectNode: (node: q.TreeNode<TopicViewModel>) => void
+}
+
+const styles = (theme: Theme) => ({
+  button: {
+    textTransform: 'none' as 'none',
+    padding: '3px 5px 3px 5px',
+    minWidth: '30px',
+  },
+})
+
+class Topic extends React.Component<Props, {}> {
+  public render() {
+    const { node, theme } = this.props
+    if (!node) {
+      return null
+    }
+
+    let key = 0
+    const breadCrumps = node
+      .branch()
+      .map(node => node.sourceEdge)
+      .filter(edge => Boolean(edge))
+      .map(edge => [
+        <Button
+          onClick={() => this.props.actions.selectTopic(edge!.target)}
+          size="small"
+          variant={theme.palette.type === 'light' ? 'contained' : undefined}
+          color={theme.palette.type === 'light' ? 'primary' : 'secondary'}
+          className={this.props.classes.button}
+          key={edge!.hash()}
+        >
+          {edge!.name || <span dangerouslySetInnerHTML={{ __html: '&nbsp;' }} />}
+        </Button>,
+      ])
+
+    if (breadCrumps.length === 0) {
+      return null
+    }
+
+    const joinedBreadCrumps = breadCrumps.reduce((prev, current) =>
+      prev.concat([<span key={(key += 1)}> / </span>]).concat(current)
+    )
+
+    return <span style={{ lineHeight: '2.2em' }}>{joinedBreadCrumps}</span>
+  }
+}
+
+const mapDispatchToProps = (dispatch: any) => {
+  return {
+    actions: bindActionCreators(treeActions, dispatch),
+  }
+}
+
+export default connect(
+  null,
+  mapDispatchToProps
+)(withStyles(styles, { withTheme: true })(Topic))