Refactoring workspace for further use

src/frontend/common/stylesheet/dimensions.scss

 $line-height: 32px;
-$resizeable-min: 20px;
 $font-size-normal: 12px;
 $font-size-large: 14px;
\ No newline at end of file

src/frontend/common/util.js

 const classes = (...arr) => arr.filter(v => v).join(' ');
 
-const calculatePercentageWidth = (element, x) => {
-  const { offsetWidth, offsetLeft } = element;
-  return ((x - offsetLeft) / offsetWidth * 100).toFixed(1) + '%';
-};
-
-const calculatePercentageHeight = (element, y) => {
-  const { offsetHeight, offsetTop } = element;
-  return ((y - offsetTop) / offsetHeight * 100).toFixed(1) + '%';
-};
-
 const serialize = object => JSON.parse(JSON.stringify(object));
 
 const distance = (a, b) => {
@@ -20,8 +10,6 @@ const distance = (a, b) => {
 
 export {
   classes,
-  calculatePercentageWidth,
-  calculatePercentageHeight,
   serialize,
   distance,
 };
\ No newline at end of file

src/frontend/components/App/index.jsx

 import React from 'react';
 import { connect } from 'react-redux';
 import { loadProgressBar } from 'axios-progress-bar'
-import { Divider, EditorSection, Header, Navigator, ToastContainer, ViewerSection } from '/components';
+import {
+  CodeEditor,
+  DescriptionViewer,
+  Header,
+  Navigator,
+  RendererContainer,
+  ToastContainer,
+  WikiViewer
+} from '/components';
 import { actions as toastActions } from '/reducers/toast';
 import { actions as envActions } from '/reducers/env';
-import { calculatePercentageWidth } from '/common/util';
 import { DirectoryApi } from '/apis';
-import { tracerManager } from '/core';
+import { tracerManager, Workspace } from '/core';
 import styles from './stylesheet.scss';
 import 'axios-progress-bar/dist/nprogress.css'
 
@@ -25,11 +32,14 @@ class App extends React.Component {
   constructor(props) {
     super(props);
 
-    this.state = {
-      navigatorOpened: true,
-      navigatorWidth: '16%',
-      viewerSectionWidth: '50%',
-    }
+    this.workspace = new Workspace();
+    this.navigator = this.workspace.addBasicSection(Navigator, 2);
+    const leftTabSection = this.workspace.addTabSection(5);
+    leftTabSection.addTab('Visualization', RendererContainer);
+    leftTabSection.addTab('Description', DescriptionViewer);
+    leftTabSection.addTab('Tracer API', WikiViewer);
+    const rightTabSection = this.workspace.addTabSection(5);
+    rightTabSection.addTab('code.js', CodeEditor);
   }
 
   componentDidMount() {
@@ -45,6 +55,12 @@ class App extends React.Component {
       });
 
     tracerManager.setOnError(error => this.props.showErrorToast(error.message));
+    this.workspace.setOnChange(() => this.forceUpdate());
+  }
+
+  componentWillUnmount() {
+    tracerManager.setOnError(null);
+    this.workspace.setOnChange(null);
   }
 
   componentWillReceiveProps(nextProps) {
@@ -53,47 +69,21 @@ class App extends React.Component {
     }
   }
 
-  componentWillUnmount() {
-    tracerManager.setOnError(null);
-  }
-
   updateDirectory({ categoryKey = null, algorithmKey = null }) {
     this.props.setDirectory(categoryKey, algorithmKey);
   }
 
-  toggleNavigator(navigatorOpened = !this.state.navigatorOpened) {
-    this.setState({ navigatorOpened });
-  }
-
-  handleResizeNavigator(x, y) {
-    const navigatorWidth = calculatePercentageWidth(this.elMain, x);
-    this.setState({ navigatorWidth });
-  }
-
-  handleResizeViewerSection(x, y) {
-    const viewerSectionWidth = calculatePercentageWidth(this.elWorkspace, x);
-    this.setState({ viewerSectionWidth });
-  }
-
   render() {
-    const { navigatorOpened, navigatorWidth, viewerSectionWidth } = this.state;
     const { categories, categoryKey, algorithmKey } = this.props.env;
 
+    const navigatorOpened = this.navigator.isVisible();
+
     return categories && categoryKey && algorithmKey && (
       <div className={styles.app}>
-        <Header onClickTitleBar={() => this.toggleNavigator()} navigatorOpened={navigatorOpened} />
-        <main className={styles.main} ref={ref => this.elMain = ref}>
-          {
-            navigatorOpened &&
-            <Navigator className={styles.navigator} style={{ width: navigatorWidth }} />
-          }
-          <Divider vertical onResize={(x, y) => this.handleResizeNavigator(x, y)} />
-          <div className={styles.workspace} ref={ref => this.elWorkspace = ref}>
-            <ViewerSection className={styles.viewer_section} style={{ width: viewerSectionWidth }} />
-            <Divider vertical onResize={(x, y) => this.handleResizeViewerSection(x, y)} />
-            <EditorSection className={styles.editor_section} />
-          </div>
-        </main>
+        <Header onClickTitleBar={() => this.navigator.setVisible(!navigatorOpened)} navigatorOpened={navigatorOpened} />
+        {
+          this.workspace.render({ className: styles.workspace })
+        }
         <ToastContainer className={styles.toast_container} />
       </div>
     );

src/frontend/components/App/stylesheet.scss

@@ -37,41 +37,10 @@ input {
   align-items: stretch;
   height: 100%;
 
-  .loading_slider {
-    position: absolute;
-    top: 0;
-    left: 0;
-    right: 0;
-  }
-
-  .main {
+  .workspace {
     flex: 1;
-    display: flex;
-    align-items: stretch;
-
-    .navigator {
-      min-width: $resizeable-min;
-    }
-
-    .workspace {
-      flex: 1;
-      display: flex;
-      align-items: stretch;
-      background-color: $theme-dark;
-      min-width: $resizeable-min * 2;
-
-      .viewer_section {
-        border: 1px solid $theme-light;
-        min-width: $resizeable-min;
-      }
-
-      .editor_section {
-        flex: 1;
-        margin-left: -1px;
-        border: 1px solid $theme-light;
-        min-width: $resizeable-min;
-      }
-    }
+    background-color: $theme-dark;
+    border-top: 1px solid $theme-light;
   }
 
   .toast_container {
@@ -80,67 +49,4 @@ input {
     right: 0;
     z-index: 99;
   }
-}
-
+}
\ No newline at end of file
-//----!!!
-
-.fa-spin-faster {
-  animation: fa-spin 1s infinite ease-in-out;
-}
-
-.mchrt-chart {
-  width: 100%;
-  height: 100%;
-}
-
-//------???
-.buttonContainer {
-  width: 75px;
-  height: 25px;
-  display: block;
-  position: relative;
-  z-index: 100;
-  background-color: white;
-}
-
-.inputField {
-  width: 25px;
-  border: 0;
-}
-
-.sb-button {
-  border: 1px solid $theme-light;
-  height: 25px;
-  margin: 0 auto;
-}
-
-.auto-gen {
-  top: 30px;
-  height: 100%;
-  width: 100%;
-  text-align: center;
-  background-color: $theme-dark;
-  align-items: center;
-}
-
-.inputs {
-  display: inline-block;
-  border: 0;
-  background-color: $theme-light;
-  height: 25px;
-  width: 75px;
-}
-
-.grid {
-  width: 50%;
-  height: 50%;
-  float: left;
-  -webkit-box-sizing: border-box;
-  -moz-box-sizing: border-box;
-  box-sizing: border-box;
-}
-
-.fields {
-  margin-top: 5px;
-  margin-bottom: 5px;
-}

src/frontend/components/BasicSection/index.jsx

+import React from 'react';
+import { classes } from '/common/util';
+import { Section } from '/components';
+import styles from './stylesheet.scss';
+
+class BasicSection extends React.Component {
+  render() {
+    const { className, Component, style, relativeWeight } = this.props;
+
+    return (
+      <Section className={classes(styles.basic_section, className)} style={style}>
+        <Component className={styles.component} relativeWeight={relativeWeight} />
+      </Section>
+    );
+  }
+}
+
+export default BasicSection;

src/frontend/components/BasicSection/stylesheet.scss

+@import "~/common/stylesheet/index";
+
+.basic_section {
+  .component {
+    flex: 1;
+  }
+}
\ No newline at end of file

src/frontend/components/EditorSection/index.jsx → src/frontend/components/CodeEditor/index.jsx

@@ -3,13 +3,10 @@ import { connect } from 'react-redux';
 import AceEditor from 'react-ace';
 import 'brace/mode/javascript';
 import 'brace/theme/tomorrow_night_eighties';
-import FontAwesomeIcon from '@fortawesome/react-fontawesome'
-import faInfoCircle from '@fortawesome/fontawesome-free-solid/faInfoCircle';
-import { classes } from '/common/util';
-import { Ellipsis, TabBar } from '/components';
 import { actions as envActions } from '/reducers/env';
 import { tracerManager } from '/core';
 import { DirectoryApi } from '/apis';
+import { classes } from '/common/util';
 import styles from './stylesheet.scss';
 
 @connect(
@@ -19,7 +16,7 @@ import styles from './stylesheet.scss';
     ...envActions,
   }
 )
-class EditorSection extends React.Component {
+class CodeEditor extends React.Component {
   constructor(props) {
     super(props);
 
@@ -79,42 +76,22 @@ class EditorSection extends React.Component {
 
   render() {
     const { lineMarker, code } = this.state;
-    const { className } = this.props;
-    const { categories, categoryKey, algorithmKey } = this.props.env;
-
-    const category = categories.find(category => category.key === categoryKey);
-    const algorithm = category.algorithms.find(algorithm => algorithm.key === algorithmKey);
-    const tabs = ['code.js'].map(fileName => ({
-      title: fileName,
-      props: {
-        to: `/${category.key}/${algorithm.key}`
-      },
-    }));
-    const tabIndex = 0; // TODO
-    const fileInfo = ''; // TODO
+    const { className, relativeWeight } = this.props;
 
     return (
-      <section className={classes(styles.editor_section, className)}>
-        <TabBar tabs={tabs} tabIndex={tabIndex} />
-        <div className={styles.info_container}>
-          <FontAwesomeIcon fixedWidth icon={faInfoCircle} className={styles.info_icon} />
-          <Ellipsis className={styles.info_text}>{fileInfo}</Ellipsis>
-        </div>
-        <div className={styles.content}>
-          <AceEditor
-            className={styles.editor}
-            mode="javascript"
-            theme="tomorrow_night_eighties"
-            name="code_editor"
-            editorProps={{ $blockScrolling: true }}
-            onChange={value => this.handleChangeCode(value)}
-            markers={lineMarker ? [lineMarker] : []}
-            value={code} />
-        </div>
-      </section>
+      <AceEditor
+        className={classes(styles.code_editor, className)}
+        mode="javascript"
+        theme="tomorrow_night_eighties"
+        name="code_editor"
+        editorProps={{ $blockScrolling: true }}
+        onChange={value => this.handleChangeCode(value)}
+        markers={lineMarker ? [lineMarker] : []}
+        value={code}
+        width={relativeWeight} /> // trick to update on resize
     );
   }
 }
 
-export default EditorSection;
+export default CodeEditor;
 

src/frontend/components/CodeEditor/stylesheet.scss

+@import "~/common/stylesheet/index";
+
+.code_editor {
+  width: 100% !important;
+  height: 100% !important;
+  min-width: 0 !important;
+  min-height: 0 !important;
+
+  .current_line_marker {
+    background: rgba(#29d, 0.4);
+    border: 1px solid #29d;
+    position: absolute;
+    width: 100% !important;
+
+    animation: line_highlight .1s;
+  }
+
+  @keyframes line_highlight {
+    from {
+      background: rgba(#29d, 0.1);
+    }
+    to {
+      background: rgba(#29d, 0.4);
+    }
+  }
+}
\ No newline at end of file

src/frontend/components/DescriptionViewer/stylesheet.scss

@@ -6,6 +6,7 @@
   align-items: stretch;
   padding: 16px;
   font-size: $font-size-large;
+  overflow-y: scroll;
 
   li {
     margin: 10px 0px;

src/frontend/components/Divider/index.jsx

@@ -12,13 +12,14 @@ class Divider extends React.Component {
   }
 
   handleMouseDown(e) {
+    this.target = e.target;
     document.addEventListener('mousemove', this.handleMouseMove);
     document.addEventListener('mouseup', this.handleMouseUp);
   }
 
   handleMouseMove(e) {
     const { onResize } = this.props;
-    onResize(e.clientX, e.clientY);
+    onResize(this.target, e.clientX, e.clientY);
   }
 
   handleMouseUp(e) {
@@ -27,11 +28,11 @@ class Divider extends React.Component {
   }
 
   render() {
-    const { className, vertical, horizontal } = this.props;
+    const { className, horizontal } = this.props;
 
     return (
       <div
-        className={classes(styles.divider, vertical && styles.vertical, horizontal && styles.horizontal, className)}
+        className={classes(styles.divider, horizontal ? styles.horizontal : styles.vertical, className)}
         onMouseDown={this.handleMouseDown} />
     );
   }

src/frontend/components/Divider/stylesheet.scss

@@ -4,23 +4,53 @@
   position: relative;
   z-index: 99;
 
-  &.vertical:after {
-    position: absolute;
-    content: '';
-    top: 0;
-    bottom: 0;
-    left: -3px;
-    width: 6px;
-    cursor: ew-resize;
+  &:before {
+    background-color: $theme-light;
   }
 
-  &.horizontal:after {
+  &:before,
+  &:after {
     position: absolute;
     content: '';
-    left: 0;
-    right: 0;
-    top: -3px;
-    height: 6px;
-    cursor: ns-resize;
+  }
+
+  &.horizontal {
+    &:before,
+    &:after {
+      top: 0;
+      bottom: 0;
+    }
+
+    &:before {
+      width: 1px;
+    }
+
+    &:after {
+      left: -3px;
+      width: 6px;
+      cursor: ew-resize;
+    }
+  }
+
+  &.vertical {
+    &:before,
+    &:after {
+      left: 0;
+      right: 0;
+    }
+
+    &:before {
+      height: 1px;
+    }
+
+    &:after {
+      top: -3px;
+      height: 6px;
+      cursor: ns-resize;
+    }
+  }
+
+  &:last-child {
+    display: none;
   }
 }
\ No newline at end of file

src/frontend/components/EditorSection/stylesheet.scss

-@import "~/common/stylesheet/index";
-
-.editor_section {
-  display: flex;
-  flex-direction: column;
-
-  .info_container {
-    display: flex;
-    align-items: center;
-    padding: 8px;
-
-    &:hover {
-      position: relative;
-      z-index: 99;
-      height: auto;
-      bottom: auto;
-      box-shadow: 0 8px 8px -8px $color-shadow;
-
-      .info_text {
-        white-space: normal;
-      }
-    }
-
-    .info_icon {
-      margin-right: 8px;
-    }
-
-    .info_text {
-      display: block;
-    }
-  }
-
-  .content {
-    flex: 1;
-    display: flex;
-    flex-direction: column;
-
-    .editor {
-      width: 100% !important;
-      height: 100% !important;
-
-      .current_line_marker {
-        background: rgba(#29d, 0.4);
-        border: 1px solid #29d;
-        position: absolute;
-        width: 100% !important;
-
-        animation: line_highlight .1s;
-      }
-
-      @keyframes line_highlight {
-        from {
-          background: rgba(#29d, 0.1);
-        }
-        to {
-          background: rgba(#29d, 0.4);
-        }
-      }
-    }
-  }
-}
\ No newline at end of file

src/frontend/components/ExpandableListItem/index.jsx

@@ -3,25 +3,23 @@ import FontAwesomeIcon from '@fortawesome/react-fontawesome'
 import faCaretDown from '@fortawesome/fontawesome-free-solid/faCaretDown';
 import faCaretRight from '@fortawesome/fontawesome-free-solid/faCaretRight';
 import styles from './stylesheet.scss';
-import { Ellipsis, ListItem } from '/components';
+import { ListItem } from '/components';
 import { classes } from '/common/util';
 
 class ExpandableListItem extends React.Component {
   render() {
-    const { className, children, label, opened, ...props } = this.props;
+    const { className, children, opened, ...props } = this.props;
 
     return opened ? (
       <div className={classes(styles.expandable_list_item, className)}>
         <ListItem className={styles.category} {...props}>
-          <Ellipsis className={styles.label}>{label}</Ellipsis>
-          <FontAwesomeIcon fixedWidth icon={faCaretDown} />
+          <FontAwesomeIcon className={styles.icon} fixedWidth icon={faCaretDown} />
         </ListItem>
         {children}
       </div>
     ) : (
       <ListItem className={classes(styles.category, className)} {...props}>
-        <Ellipsis className={styles.label}>{label}</Ellipsis>
-        <FontAwesomeIcon fixedWidth icon={faCaretRight} />
+        <FontAwesomeIcon className={styles.icon} fixedWidth icon={faCaretRight} />
       </ListItem>
     );
   }

src/frontend/components/ExpandableListItem/stylesheet.scss

@@ -3,9 +3,8 @@
 .category {
   justify-content: space-between;
 
-  .label {
-    flex: 1;
-    margin-right: 4px;
+  .icon {
+    margin-left: 4px;
   }
 }
 

src/frontend/components/ListItem/index.jsx

 import React from 'react';
 import styles from './stylesheet.scss';
 import { classes } from '/common/util';
-import { Button } from '/components';
+import { Button, Ellipsis } from '/components';
 
 class ListItem extends React.Component {
   render() {
-    const { className, children, indent, ...props } = this.props;
+    const { className, children, indent, label, ...props } = this.props;
 
     return (
       <Button className={classes(styles.list_item, indent && styles.indent, className)} {...props}>
+        <Ellipsis className={styles.label}>{label}</Ellipsis>
         {children}
       </Button>
     );

src/frontend/components/ListItem/stylesheet.scss

@@ -3,6 +3,10 @@
 .list_item {
   height: $line-height;
 
+  .label {
+    flex: 1;
+  }
+
   &.indent {
     padding-left: 24px;
   }

src/frontend/components/Navigator/index.jsx

@@ -5,10 +5,9 @@ import faSearch from '@fortawesome/fontawesome-free-solid/faSearch';
 import faCode from '@fortawesome/fontawesome-free-solid/faCode';
 import faBook from '@fortawesome/fontawesome-free-solid/faBook';
 import faGithub from '@fortawesome/fontawesome-free-brands/faGithub';
-import { Ellipsis, ExpandableListItem, ListItem } from '/components';
+import { ExpandableListItem, ListItem } from '/components';
 import { classes } from '/common/util';
 import { actions as envActions } from '/reducers/env';
-import 'github-fork-ribbon-css/gh-fork-ribbon.css';
 import styles from './stylesheet.scss';
 
 @connect(
@@ -93,9 +92,7 @@ class Navigator extends React.Component {
                       const selected = category.key === selectedCategoryKey && algorithm.key === selectedAlgorithmKey;
                       return (
                         <ListItem indent key={algorithm.key} selected={selected}
-                                  to={`/${category.key}/${algorithm.key}`}>
-                          <Ellipsis>{algorithm.name}</Ellipsis>
-                        </ListItem>
+                                  to={`/${category.key}/${algorithm.key}`} label={algorithm.name} />
                       )
                     })
                   }
@@ -105,25 +102,10 @@ class Navigator extends React.Component {
           }
         </div>
         <div className={styles.footer}>
-          <ListItem className={styles.scratch_paper} icon={faCode}>Scratch Paper</ListItem>
-          <ListItem className={styles.documentation} icon={faBook}>Tracer API</ListItem>
-          <ExpandableListItem icon={faGithub} onClick={() => this.togglePoweredBy()} label="Powered by ..."
-                              opened={poweredByOpened}>
-            <ListItem indent href="https://github.com/jquery/jquery">jquery/jquery</ListItem>
-            <ListItem indent href="https://github.com/ajaxorg/ace">ajaxorg/ace</ListItem>
-            <ListItem indent href="https://github.com/jacomyal/sigma.js">jacomyal/sigma.js</ListItem>
-            <ListItem indent href="https://github.com/chartjs/Chart.js">chartjs/Chart.js</ListItem>
-            <ListItem indent href="https://github.com/Daniel15/babel-standalone">Daniel15/babel-standalone</ListItem>
-            <ListItem indent href="https://github.com/showdownjs/showdown">showdownjs/showdown</ListItem>
-            <ListItem indent href="https://github.com/FortAwesome/Font-Awesome">FortAwesome/Font-Awesome</ListItem>
-            <ListItem indent href="https://github.com/simonwhitaker/github-fork-ribbon-css">simonwhitaker/github-fork-ribbon-css</ListItem>
-            <ListItem indent href="https://github.com/mathjax/MathJax">mathjax/MathJax</ListItem>
-          </ExpandableListItem>
+          <ListItem icon={faCode} label="Scratch Paper" />
+          <ListItem icon={faBook} label="Tracer API" />
+          <ListItem icon={faGithub} label="Fork me on GitHub" href="https://github.com/parkjs814/AlgorithmVisualizer" />
         </div>
-        <a className={classes('github-fork-ribbon', 'right-bottom')}
-           href="http://github.com/parkjs814/AlgorithmVisualizer" data-ribbon="Fork me on GitHub"
-           title="Fork me on GitHub">Fork me on GitHub
-        </a>
       </nav>
     );
   }

src/frontend/components/Navigator/stylesheet.scss

 @import "~/common/stylesheet/index";
 
 .navigator {
-  position: relative;
   display: flex;
   flex-direction: column;
+  background-color: $theme-normal;
 
   .search_bar_container {
     height: $line-height;
     padding: 0 8px;
     display: flex;
     align-items: stretch;
-    border-top: 1px solid $theme-light;
+    border-bottom: 1px solid $theme-light;
 
     &:focus-within {
       background-color: $color-overlay;
@@ -27,24 +27,15 @@
       background: none;
       border: none;
       outline: none;
-      overflow: hidden;
     }
   }
 
   .algorithm_list {
     flex: 1;
-    border-bottom: 1px solid $theme-light;
     overflow-y: scroll;
-    border-top: 1px solid $theme-light;
   }
 
-  :global(.github-fork-ribbon) {
-    &:before {
-      background-color: $theme-normal;
-    }
-
-    &:after {
-      color: $color-font;
-    }
+  .footer {
+    border-top: 1px solid $theme-light;
   }
 }
\ No newline at end of file

src/frontend/components/RendererContainer/stylesheet.scss

 @import "~/common/stylesheet/index";
 
 .renderer_container {
-  flex: 1;
   display: flex;
   align-items: stretch;
   flex-direction: column;

src/frontend/components/Section/index.jsx

+import React from 'react';
+import { classes } from '/common/util';
+import styles from './stylesheet.scss';
+
+class Section extends React.Component {
+  render() {
+    const { className, children, style } = this.props;
+
+    return (
+      <section className={classes(styles.section, className)} style={style}>
+        {children}
+      </section>
+    );
+  }
+}
+
+export default Section;

src/frontend/components/Section/stylesheet.scss

+@import "~/common/stylesheet/index";
+
+.section {
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  min-width: 0;
+  min-height: 0;
+  overflow: hidden;
+}
\ No newline at end of file

src/frontend/components/SectionContainer/index.jsx

+import React from 'react';
+import { classes } from '/common/util';
+import { Section } from '/components';
+import styles from './stylesheet.scss';
+
+class SectionContainer extends React.Component {
+  render() {
+    const { className, children, horizontal, style } = this.props;
+
+    return (
+      <Section className={classes(styles.section_container, horizontal && styles.horizontal, className)} style={style}>
+        {children}
+      </Section>
+    );
+  }
+}
+
+export default SectionContainer;

src/frontend/components/SectionContainer/stylesheet.scss

+@import "~/common/stylesheet/index";
+
+.section_container {
+  &.horizontal {
+    flex-direction: row;
+  }
+}
\ No newline at end of file

src/frontend/components/TabBar/index.jsx

-import React from 'react';
-import faAngleLeft from '@fortawesome/fontawesome-free-solid/faAngleLeft';
-import faAngleRight from '@fortawesome/fontawesome-free-solid/faAngleRight';
-import { Button } from '/components';
-import { classes } from '/common/util';
-import styles from './stylesheet.scss';
-
-class TabBar extends React.Component {
-  render() {
-    const { className, tabs, tabIndex } = this.props;
-
-    const prevIndex = (tabIndex - 1 + tabs.length) % tabs.length;
-    const nextIndex = (tabIndex + 1) % tabs.length;
-
-    return (
-      <div className={classes(styles.tab_bar, className)}>
-        <Button className={styles.tab} icon={faAngleLeft} {...tabs[prevIndex].props} />
-        <div className={styles.wrapper}>
-          {
-            tabs.map((tab, i) => {
-              const { title, props } = tab;
-              const selected = tabIndex === i;
-              return (
-                <Button className={classes(styles.tab, selected && styles.selected)} key={i} {...props}>{title}</Button>
-              )
-            })
-          }
-        </div>
-        <Button className={styles.tab} icon={faAngleRight} {...tabs[nextIndex].props} />
-      </div>
-    );
-  }
-}
-
-export default TabBar;
-

src/frontend/components/TabBar/stylesheet.scss

-@import "~/common/stylesheet/index";
-
-.tab_bar {
-  position: relative;
-  display: flex;
-  align-items: stretch;
-  height: $line-height;
-  background-color: $theme-normal;
-
-  &:before {
-    content: '';
-    position: absolute;
-    bottom: 0;
-    left: 0;
-    right: 0;
-    height: 1px;
-    background-color: $theme-light;
-  }
-
-  .wrapper {
-    position: relative;
-    flex: 1;
-    display: flex;
-    overflow-x: scroll;
-    white-space: nowrap;
-
-    .tab {
-      &.selected {
-        border-left: 1px solid $theme-light;
-        border-right: 1px solid $theme-light;
-        background-color: $theme-dark;
-      }
-    }
-
-    &.shadow-left {
-      box-shadow: inset 16px 0 16px -16px $color-shadow;
-    }
-
-    &.shadow-right {
-      box-shadow: inset -16px 0 16px -16px $color-shadow;
-    }
-
-    &.shadow-left.shadow-right {
-      box-shadow: inset 16px 0 16px -16px $color-shadow, inset -16px 0 16px -16px $color-shadow;
-    }
-  }
-}
\ No newline at end of file

src/frontend/components/TabSection/index.jsx

+import React from 'react';
+import faAngleLeft from '@fortawesome/fontawesome-free-solid/faAngleLeft';
+import faAngleRight from '@fortawesome/fontawesome-free-solid/faAngleRight';
+import { classes } from '/common/util';
+import { Button, Section } from '/components';
+import styles from './stylesheet.scss';
+
+class TabSection extends React.Component {
+  render() {
+    const { className, tabs, tabIndex, onChangeTabIndex, style, relativeWeight } = this.props;
+
+    const prevIndex = (tabIndex - 1 + tabs.length) % tabs.length;
+    const nextIndex = (tabIndex + 1) % tabs.length;
+
+    return (
+      <Section className={classes(styles.tab_section, className)} style={style}>
+        <div className={styles.tab_bar}>
+          <Button className={styles.tab} icon={faAngleLeft} onClick={() => onChangeTabIndex(prevIndex)} />
+          <div className={styles.wrapper}>
+            {
+              tabs.map((tab, i) => {
+                const { id, title } = tab;
+                const selected = tabIndex === i;
+                return (
+                  <Button className={classes(styles.title, selected && styles.selected)} key={id}
+                          onClick={() => onChangeTabIndex(i)}>
+                    {title}
+                  </Button>
+                )
+              })
+            }
+          </div>
+          <Button className={styles.tab} icon={faAngleRight} onClick={() => onChangeTabIndex(nextIndex)} />
+        </div>
+        <div className={styles.content} data-tab_index={tabIndex}>
+          {
+            tabs.map((tab, i) => {
+              const { id, Component } = tab;
+              const selected = tabIndex === i;
+              return <Component key={id} className={classes(styles.tab, selected && styles.selected)}
+                                relativeWeight={relativeWeight} />;
+            })
+          }
+        </div>
+      </Section>
+    );
+  }
+}
+
+export default TabSection;
+

src/frontend/components/TabSection/stylesheet.scss

+@import "~/common/stylesheet/index";
+
+.tab_section {
+  .tab_bar {
+    position: relative;
+    display: flex;
+    align-items: stretch;
+    height: $line-height;
+    background-color: $theme-normal;
+
+    &:before {
+      content: '';
+      position: absolute;
+      bottom: 0;
+      left: 0;
+      right: 0;
+      height: 1px;
+      background-color: $theme-light;
+    }
+
+    .wrapper {
+      position: relative;
+      flex: 1;
+      display: flex;
+      overflow-x: scroll;
+      white-space: nowrap;
+
+      .title {
+        &.selected {
+          border-left: 1px solid $theme-light;
+          border-right: 1px solid $theme-light;
+          background-color: $theme-dark;
+        }
+      }
+    }
+  }
+
+  .content {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+
+    .tab {
+      flex: 1;
+      display: none;
+
+      &.selected {
+        display: flex;
+      }
+    }
+  }
+}
\ No newline at end of file

src/frontend/components/ViewerSection/index.jsx

-import React from 'react';
-import { classes } from '/common/util';
-import { DescriptionViewer, RendererContainer, TabBar, WikiViewer } from '/components';
-import styles from './stylesheet.scss';
-
-class ViewerSection extends React.Component {
-  constructor(props) {
-    super(props);
-
-    this.state = {
-      tabIndex: 0,
-    };
-  }
-
-  setTabIndex(tabIndex) {
-    this.setState({ tabIndex });
-  }
-
-  render() {
-    const { className, style } = this.props;
-    const { tabIndex } = this.state;
-
-    const tabs = ['Visualization', 'Description', 'Tracer API'].map((title, i) => ({
-      title,
-      props: {
-        onClick: () => this.setTabIndex(i)
-      },
-    }));
-
-    return (
-      <section className={classes(styles.viewer_section, className)} style={style}>
-        <TabBar tabs={tabs} tabIndex={tabIndex} />
-        <div className={styles.content} data-tab_index={tabIndex}>
-          <RendererContainer className={styles.tab} />
-          <DescriptionViewer className={styles.tab} />
-          <WikiViewer className={styles.tab} />
-        </div>
-      </section>
-    );
-  }
-}
-
-export default ViewerSection;
-

src/frontend/components/ViewerSection/stylesheet.scss

-@import "~/common/stylesheet/index";
-
-.viewer_section {
-  display: flex;
-  flex-direction: column;
-  align-items: stretch;
-
-  .content {
-    flex: 1;
-    display: flex;
-    flex-direction: column;
-    overflow-y: scroll;
-
-    .tab {
-      display: none;
-    }
-
-    &[data-tab_index='0'] .tab:nth-child(1),
-    &[data-tab_index='1'] .tab:nth-child(2),
-    &[data-tab_index='2'] .tab:nth-child(3) {
-      display: flex;
-    }
-  }
-}
\ No newline at end of file

src/frontend/components/WikiViewer/index.jsx

@@ -35,9 +35,8 @@ class WikiViewer extends React.Component {
     };
 
     return (
-      <div className={classes(styles.wiki_viewer, className)}>
-        <ReactMarkdown className={styles.markdown} source={wiki} renderers={{ link: InnerLink }} />
-      </div>
+      <ReactMarkdown className={classes(styles.wiki_viewer, className)} source={wiki} renderers={{ link: InnerLink }}>
+      </ReactMarkdown>
     );
   }
 }

src/frontend/components/WikiViewer/stylesheet.scss

@@ -4,14 +4,12 @@
   display: flex;
   flex-direction: column;
   align-items: stretch;
+  padding: 16px;
+  font-size: $font-size-large;
+  overflow-y: scroll;
 
-  .markdown {
-    padding: 16px;
-    font-size: $font-size-large;
-
-    a {
-      text-decoration: underline;
-      cursor: pointer;
-    }
+  a {
+    text-decoration: underline;
+    cursor: pointer;
   }
 }
\ No newline at end of file

src/frontend/components/index.js

 export { default as App } from './App';
+export { default as BasicSection } from './BasicSection';
 export { default as Button } from './Button';
+export { default as CodeEditor } from './CodeEditor';
 export { default as DescriptionViewer } from './DescriptionViewer';
 export { default as Divider } from './Divider';
-export { default as EditorSection } from './EditorSection';
 export { default as Ellipsis } from './Ellipsis';
 export { default as ExpandableListItem } from './ExpandableListItem';
 export { default as Header } from './Header';
 export { default as ListItem } from './ListItem';
 export { default as Navigator } from './Navigator';
 export { default as RendererContainer } from './RendererContainer';
-export { default as TabBar } from './TabBar';
+export { default as Section } from './Section';
+export { default as SectionContainer } from './SectionContainer';
+export { default as TabSection } from './TabSection';
 export { default as ToastContainer } from './ToastContainer';
-export { default as ViewerSection } from './ViewerSection';
 export { default as WikiViewer } from './WikiViewer';

src/frontend/core/Workspace.js

+import uuid from 'uuid';
+import React from 'react';
+import { BasicSection, Divider, SectionContainer, TabSection } from '/components';
+
+const minSize = 20;
+
+class UISection {
+  constructor(parent = null, weight = 1, visible = true) {
+    this.id = uuid.v4();
+    this.parent = parent;
+    this.weight = weight;
+    this.visible = visible;
+  }
+
+  setVisible(visible) {
+    this.visible = visible;
+    this.change();
+  }
+
+  isVisible() {
+    return this.visible;
+  }
+
+  handleResize(target, clientX, clientY) {
+    const { offsetLeft, offsetTop, offsetWidth, offsetHeight } = target.parentElement;
+    let position, size;
+
+    if (this.parent.horizontal) {
+      position = clientX - offsetLeft;
+      size = offsetWidth;
+    } else {
+      position = clientY - offsetTop;
+      size = offsetHeight;
+    }
+
+    const visibleSections = this.parent.sections.filter(section => section.visible);
+    const index = visibleSections.findIndex(section => section === this);
+    const weights = visibleSections.map(section => section.weight);
+    const totalWeight = weights.reduce((sumWeight, weight) => sumWeight + weight, 0);
+
+    const startWeight = weights.slice(0, index).reduce((sumWeight, weight) => sumWeight + weight, 0);
+    const endWeight = position / size * totalWeight;
+
+    const oldWeight = weights[index];
+    const newWeight = endWeight - startWeight;
+
+    const oldScale = totalWeight - startWeight - oldWeight;
+    const newScale = totalWeight - startWeight - newWeight;
+    const ratio = newScale / oldScale;
+
+    weights[index] = newWeight;
+    for (let i = index + 1; i < weights.length; i++) {
+      weights[i] *= ratio;
+    }
+
+    for (let i = index; i < weights.length; i++) {
+      if (weights[i] / totalWeight * size < minSize) return;
+    }
+
+    for (let i = index; i < visibleSections.length; i++) {
+      visibleSections[i].weight = weights[i];
+    }
+
+    this.change();
+  }
+
+  render(props) {
+    return null;
+  }
+
+  renderDivider(props) {
+    return (
+      <Divider {...props} onResize={(target, x, y) => this.handleResize(target, x, y)} />
+    );
+  }
+
+  change() {
+    if (this.parent) this.parent.change();
+  }
+}
+
+class UIBasicSection extends UISection {
+  constructor(parent, Component, weight, visible) {
+    super(parent, weight, visible);
+    this.Component = Component;
+  }
+
+  render(props) {
+    return (
+      <BasicSection {...props} Component={this.Component} />
+    );
+  }
+}
+
+class UITabSection extends UISection {
+  constructor(parent, weight, visible) {
+    super(parent, weight, visible);
+    this.tabs = [];
+    this.tabIndex = 0;
+  }
+
+  addTab(title, Component) {
+    const tab = { id: uuid.v4(), title, Component };
+    this.tabs.push(tab);
+    this.change();
+    return tab;
+  }
+
+  setTabIndex(tabIndex) {
+    this.tabIndex = tabIndex;
+    this.change();
+  }
+
+  render(props) {
+    return (
+      <TabSection {...props} tabs={this.tabs} tabIndex={this.tabIndex}
+                  onChangeTabIndex={tabIndex => this.setTabIndex(tabIndex)} />
+    );
+  }
+}
+
+class UIContainer extends UISection {
+  constructor(parent, horizontal = true, weight, visible) {
+    super(parent, weight, visible);
+    this.horizontal = horizontal;
+    this.sections = [];
+  }
+
+  setHorizontal(horizontal) {
+    this.horizontal = horizontal;
+    this.change();
+  }
+
+  addBasicSection(Component, weight) {
+    const section = new UIBasicSection(this, Component, weight);
+    this.sections.push(section);
+    this.change();
+    return section;
+  }
+
+  addTabSection(weight) {
+    const section = new UITabSection(this, weight);
+    this.sections.push(section);
+    this.change();
+    return section;
+  }
+
+  addContainer(horizontal, weight) {
+    const container = new UIContainer(this, horizontal, weight);
+    this.sections.push(container);
+    this.change();
+    return container;
+  }
+
+  render(props) {
+    const visibleSections = this.sections.filter(section => section.visible);
+    const weights = visibleSections.map(section => section.weight);
+    const totalWeight = weights.reduce((sumWeight, weight) => sumWeight + weight, 0);
+    return (
+      <SectionContainer {...props} horizontal={this.horizontal}>
+        {
+          visibleSections.map(section => {
+            const relativeWeight = section.weight / totalWeight;
+            return [
+              section.render({
+                key: section.id,
+                style: { flex: relativeWeight },
+                relativeWeight,
+              }),
+              section.renderDivider({ key: `divider-${section.id}`, horizontal: this.horizontal }),
+            ];
+          }).reduce((flat, toFlatten) => flat.concat(toFlatten), [])
+        }
+      </SectionContainer>
+    );
+  }
+}
+
+class Workspace {
+  constructor(horizontal) {
+    this.rootContainer = new UIContainer(this, horizontal);
+    this.onChange = null;
+  }
+
+  getRootContainer() {
+    return this.rootContainer;
+  }
+
+  setHorizontal(horizontal) {
+    this.rootContainer.setHorizontal(horizontal);
+  }
+
+  addBasicSection(Component, weight) {
+    return this.rootContainer.addBasicSection(Component, weight);
+  }
+
+  addTabSection(weight) {
+    return this.rootContainer.addTabSection(weight);
+  }
+
+  addContainer(horizontal, weight) {
+    return this.rootContainer.addContainer(horizontal, weight);
+  }
+
+  render(props) {
+    return this.rootContainer.render(props);
+  }
+
+  setOnChange(onChange) {
+    this.onChange = onChange;
+    this.change();
+  }
+
+  change() {
+    if (this.onChange) this.onChange(this.rootContainer);
+  }
+}
+
+export default Workspace;
\ No newline at end of file

src/frontend/core/index.js

@@ -2,4 +2,5 @@ export { default as datas } from './datas';
 export { default as tracers } from './tracers';
 export { default as renderers } from './renderers';
 export { default as Seed } from './Seed';
-export { default as tracerManager } from './tracerManager';
+export { default as tracerManager } from './tracerManager';
\ No newline at end of file
+export { default as Workspace } from './Workspace';
\ No newline at end of file

src/frontend/core/renderers/Renderer/index.jsx

 import React from 'react';
 import styles from './stylesheet.scss';
+import { Ellipsis } from '/components';
 
 class Renderer extends React.Component {
   constructor(props) {
@@ -100,7 +101,7 @@ class Renderer extends React.Component {
 
     return (
       <div className={styles.renderer} onMouseDown={this.handleMouseDown} onWheel={this.handleWheel}>
-        <span className={styles.title}>{title}</span>
+        <Ellipsis className={styles.title}>{title}</Ellipsis>
         {
           this.renderData()
         }

src/frontend/core/renderers/Renderer/stylesheet.scss

@@ -8,11 +8,11 @@
   align-items: center;
   justify-content: center;
   overflow: hidden;
-  border-bottom: 1px solid $theme-light;
+  border-top: 1px solid $theme-light;
   font-family: 'Roboto Mono', monospace;
 
-  &:last-child {
-    border-bottom: none;
+  &:first-child {
+    border-top: none;
   }
 
   .title {

src/frontend/index.jsx

@@ -17,6 +17,7 @@ const render = (Component) => {
       <BrowserRouter>
         <Switch>
           <Route exact path="/:categoryKey/:algorithmKey" component={Component} />
+          <Route exact path="/:categoryKey" component={Component} />
           <Route path="/" component={Component} />
         </Switch>
       </BrowserRouter>

src/frontend/reducers/env.js

@@ -13,9 +13,7 @@ export const actions = {
   setDirectory,
 };
 
-const immutables = {};
-
-const mutables = {
+const defaultState = {
   categories: null,
   categoryKey: null,
   algorithmKey: null,
@@ -29,7 +27,4 @@ export default handleActions({
     ...state,
     ...payload,
   }),
-}, {
-  ...immutables,
-  ...mutables,
-});
+}, defaultState);

src/frontend/reducers/toast.js

@@ -13,9 +13,7 @@ export const actions = {
   hideToast,
 };
 
-const immutables = {};
-
-const mutables = {
+const defaultState = {
   toasts: [],
 };
 
@@ -38,9 +36,7 @@ export default handleActions({
       toasts,
     };
   },
-  [combineActions(
-    hideToast,
-  )]: (state, { payload }) => {
+  [hideToast]: (state, { payload }) => {
     const { id } = payload;
     const toasts = state.toasts.filter(toast => toast.id !== id);
     return {
@@ -48,7 +44,4 @@ export default handleActions({
       toasts,
     };
   },
-}, {
-  ...immutables,
-  ...mutables,
-});
+}, defaultState);