1 files changed, 251 insertions, 0 deletions
diff --git a/app/javascript/flavours/glitch/components/dropdown_menu.js b/app/javascript/flavours/glitch/components/dropdown_menu.js
new file mode 100644
index 000000000..27b2586e5
--- /dev/null
+++ b/app/javascript/flavours/glitch/components/dropdown_menu.js
@@ -0,0 +1,251 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import IconButton from './icon_button';
+import Overlay from 'react-overlays/lib/Overlay';
+import Motion from 'flavours/glitch/util/optional_motion';
+import spring from 'react-motion/lib/spring';
+import detectPassiveEvents from 'detect-passive-events';
+
+const listenerOptions = detectPassiveEvents.hasSupport ? { passive: true } : false;
+let id = 0;
+
+class DropdownMenu extends React.PureComponent {
+
+  static contextTypes = {
+    router: PropTypes.object,
+  };
+
+  static propTypes = {
+    items: PropTypes.array.isRequired,
+    onClose: PropTypes.func.isRequired,
+    style: PropTypes.object,
+    placement: PropTypes.string,
+    arrowOffsetLeft: PropTypes.string,
+    arrowOffsetTop: PropTypes.string,
+  };
+
+  static defaultProps = {
+    style: {},
+    placement: 'bottom',
+  };
+
+  state = {
+    mounted: false,
+  };
+
+  handleDocumentClick = e => {
+    if (this.node && !this.node.contains(e.target)) {
+      this.props.onClose();
+    }
+  }
+
+  componentDidMount () {
+    document.addEventListener('click', this.handleDocumentClick, false);
+    document.addEventListener('touchend', this.handleDocumentClick, listenerOptions);
+    if (this.focusedItem) this.focusedItem.focus();
+    this.setState({ mounted: true });
+  }
+
+  componentWillUnmount () {
+    document.removeEventListener('click', this.handleDocumentClick, false);
+    document.removeEventListener('touchend', this.handleDocumentClick, listenerOptions);
+  }
+
+  setRef = c => {
+    this.node = c;
+  }
+
+  setFocusRef = c => {
+    this.focusedItem = c;
+  }
+
+  handleKeyDown = e => {
+    const items = Array.from(this.node.getElementsByTagName('a'));
+    const index = items.indexOf(e.currentTarget);
+    let element;
+
+    switch(e.key) {
+    case 'Enter':
+      this.handleClick(e);
+      break;
+    case 'ArrowDown':
+      element = items[index+1];
+      if (element) {
+        element.focus();
+      }
+      break;
+    case 'ArrowUp':
+      element = items[index-1];
+      if (element) {
+        element.focus();
+      }
+      break;
+    case 'Home':
+      element = items[0];
+      if (element) {
+        element.focus();
+      }
+      break;
+    case 'End':
+      element = items[items.length-1];
+      if (element) {
+        element.focus();
+      }
+      break;
+    }
+  }
+
+  handleClick = e => {
+    const i = Number(e.currentTarget.getAttribute('data-index'));
+    const { action, to } = this.props.items[i];
+
+    this.props.onClose();
+
+    if (typeof action === 'function') {
+      e.preventDefault();
+      action();
+    } else if (to) {
+      e.preventDefault();
+      this.context.router.history.push(to);
+    }
+  }
+
+  renderItem (option, i) {
+    if (option === null) {
+      return <li key={`sep-${i}`} className='dropdown-menu__separator' />;
+    }
+
+    const { text, href = '#' } = option;
+
+    return (
+      <li className='dropdown-menu__item' key={`${text}-${i}`}>
+        <a href={href} target='_blank' rel='noopener' role='button' tabIndex='0' ref={i === 0 ? this.setFocusRef : null} onClick={this.handleClick} onKeyDown={this.handleKeyDown} data-index={i}>
+          {text}
+        </a>
+      </li>
+    );
+  }
+
+  render () {
+    const { items, style, placement, arrowOffsetLeft, arrowOffsetTop } = this.props;
+    const { mounted } = this.state;
+
+    return (
+      <Motion defaultStyle={{ opacity: 0, scaleX: 0.85, scaleY: 0.75 }} style={{ opacity: spring(1, { damping: 35, stiffness: 400 }), scaleX: spring(1, { damping: 35, stiffness: 400 }), scaleY: spring(1, { damping: 35, stiffness: 400 }) }}>
+        {({ opacity, scaleX, scaleY }) => (
+          // It should not be transformed when mounting because the resulting
+          // size will be used to determine the coordinate of the menu by
+          // react-overlays
+          <div className='dropdown-menu' style={{ ...style, opacity: opacity, transform: mounted ? `scale(${scaleX}, ${scaleY})` : null }} ref={this.setRef}>
+            <div className={`dropdown-menu__arrow ${placement}`} style={{ left: arrowOffsetLeft, top: arrowOffsetTop }} />
+
+            <ul>
+              {items.map((option, i) => this.renderItem(option, i))}
+            </ul>
+          </div>
+        )}
+      </Motion>
+    );
+  }
+
+}
+
+export default class Dropdown extends React.PureComponent {
+
+  static contextTypes = {
+    router: PropTypes.object,
+  };
+
+  static propTypes = {
+    icon: PropTypes.string.isRequired,
+    items: PropTypes.array.isRequired,
+    size: PropTypes.number.isRequired,
+    ariaLabel: PropTypes.string,
+    disabled: PropTypes.bool,
+    status: ImmutablePropTypes.map,
+    isUserTouching: PropTypes.func,
+    isModalOpen: PropTypes.bool.isRequired,
+    onOpen: PropTypes.func.isRequired,
+    onClose: PropTypes.func.isRequired,
+    dropdownPlacement: PropTypes.string,
+    openDropdownId: PropTypes.number,
+  };
+
+  static defaultProps = {
+    ariaLabel: 'Menu',
+  };
+
+  state = {
+    id: id++,
+  };
+
+  handleClick = ({ target }) => {
+    if (this.state.id === this.props.openDropdownId) {
+      this.handleClose();
+    } else {
+      const { top } = target.getBoundingClientRect();
+      const placement = top * 2 < innerHeight ? 'bottom' : 'top';
+
+      this.props.onOpen(this.state.id, this.handleItemClick, placement);
+    }
+  }
+
+  handleClose = () => {
+    this.props.onClose(this.state.id);
+  }
+
+  handleKeyDown = e => {
+    switch(e.key) {
+    case 'Escape':
+      this.handleClose();
+      break;
+    }
+  }
+
+  handleItemClick = (i, e) => {
+    const { action, to } = this.props.items[i];
+
+    this.handleClose();
+
+    if (typeof action === 'function') {
+      e.preventDefault();
+      action();
+    } else if (to) {
+      e.preventDefault();
+      this.context.router.history.push(to);
+    }
+  }
+
+  setTargetRef = c => {
+    this.target = c;
+  }
+
+  findTarget = () => {
+    return this.target;
+  }
+
+  render () {
+    const { icon, items, size, ariaLabel, disabled, dropdownPlacement, openDropdownId } = this.props;
+    const open = this.state.id === openDropdownId;
+
+    return (
+      <div onKeyDown={this.handleKeyDown}>
+        <IconButton
+          icon={icon}
+          title={ariaLabel}
+          active={open}
+          disabled={disabled}
+          size={size}
+          ref={this.setTargetRef}
+          onClick={this.handleClick}
+        />
+
+        <Overlay show={open} placement={dropdownPlacement} target={this.findTarget}>
+          <DropdownMenu items={items} onClose={this.handleClose} />
+        </Overlay>
+      </div>
+    );
+  }
+
+}