Remove pointer events on the entire UI when a dropdown menu is open (#6648)

* Remove pointer events on the entire UI when a dropdown menu is open

This prevents operations to change the location of the menu such as
scrolling.

* Fix mistake from merge

app/javascript/mastodon/actions/dropdown_menu.js

+export const DROPDOWN_MENU_OPEN = 'DROPDOWN_MENU_OPEN';
+export const DROPDOWN_MENU_CLOSE = 'DROPDOWN_MENU_CLOSE';
+
+export function openDropdownMenu(id, placement) {
+  return { type: DROPDOWN_MENU_OPEN, id, placement };
+}
+
+export function closeDropdownMenu(id) {
+  return { type: DROPDOWN_MENU_CLOSE, id };
+}

app/javascript/mastodon/components/dropdown_menu.js

@@ -8,6 +8,7 @@ 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 {
 
@@ -124,8 +125,10 @@ export default class Dropdown extends React.PureComponent {
     status: ImmutablePropTypes.map,
     isUserTouching: PropTypes.func,
     isModalOpen: PropTypes.bool.isRequired,
-    onModalOpen: PropTypes.func,
-    onModalClose: PropTypes.func,
+    onOpen: PropTypes.func.isRequired,
+    onClose: PropTypes.func.isRequired,
+    dropdownPlacement: PropTypes.string,
+    openDropdownId: PropTypes.number,
   };
 
   static defaultProps = {
@@ -133,38 +136,28 @@ export default class Dropdown extends React.PureComponent {
   };
 
   state = {
-    placement: null,
+    id: id++,
   };
 
   handleClick = ({ target }) => {
-    if (this.state.placement) {
-      this.setState({ placement: null });
-    } else if (this.props.isUserTouching() && this.props.onModalOpen) {
-      const { status, items } = this.props;
-
-      this.props.onModalOpen({
-        status,
-        actions: items,
-        onClick: this.handleItemClick,
-      });
+    if (this.state.id === this.props.openDropdownId) {
+      this.handleClose();
     } else {
       const { top } = target.getBoundingClientRect();
-      this.setState({ placement: top * 2 < innerHeight ? 'bottom' : 'top' });
+      const placement = top * 2 < innerHeight ? 'bottom' : 'top';
+
+      this.props.onOpen(this.state.id, this.handleItemClick, placement);
     }
   }
 
   handleClose = () => {
-    if (this.props.onModalClose) {
-      this.props.onModalClose();
-    }
-
-    this.setState({ placement: null });
+    this.props.onClose(this.state.id);
   }
 
   handleKeyDown = e => {
     switch(e.key) {
     case 'Enter':
-      this.handleClick();
+      this.handleClick(e);
       break;
     case 'Escape':
       this.handleClose();
@@ -196,23 +189,22 @@ export default class Dropdown extends React.PureComponent {
   }
 
   render () {
-    const { icon, items, size, title, disabled } = this.props;
-    const { placement } = this.state;
-    const show = placement !== null;
+    const { icon, items, size, title, disabled, dropdownPlacement, openDropdownId } = this.props;
+    const open = this.state.id === openDropdownId;
 
     return (
       <div onKeyDown={this.handleKeyDown}>
         <IconButton
           icon={icon}
           title={title}
-          active={show}
+          active={open}
           disabled={disabled}
           size={size}
           ref={this.setTargetRef}
           onClick={this.handleClick}
         />
 
-        <Overlay show={show} placement={placement} target={this.findTarget}>
+        <Overlay show={open} placement={dropdownPlacement} target={this.findTarget}>
           <DropdownMenu items={items} onClose={this.handleClose} />
         </Overlay>
       </div>

app/javascript/mastodon/containers/dropdown_menu_container.js

+import { openDropdownMenu, closeDropdownMenu } from '../actions/dropdown_menu';
 import { openModal, closeModal } from '../actions/modal';
 import { connect } from 'react-redux';
 import DropdownMenu from '../components/dropdown_menu';
@@ -5,12 +6,22 @@ import { isUserTouching } from '../is_mobile';
 
 const mapStateToProps = state => ({
   isModalOpen: state.get('modal').modalType === 'ACTIONS',
+  dropdownPlacement: state.getIn(['dropdown_menu', 'placement']),
+  openDropdownId: state.getIn(['dropdown_menu', 'openId']),
 });
 
-const mapDispatchToProps = dispatch => ({
-  isUserTouching,
-  onModalOpen: props => dispatch(openModal('ACTIONS', props)),
-  onModalClose: () => dispatch(closeModal()),
+const mapDispatchToProps = (dispatch, { status, items }) => ({
+  onOpen(id, onItemClick, dropdownPlacement) {
+    dispatch(isUserTouching() ? openModal('ACTIONS', {
+      status,
+      actions: items,
+      onClick: onItemClick,
+    }) : openDropdownMenu(id, dropdownPlacement));
+  },
+  onClose(id) {
+    dispatch(closeModal());
+    dispatch(closeDropdownMenu(id));
+  },
 });
 
 export default connect(mapStateToProps, mapDispatchToProps)(DropdownMenu);

app/javascript/mastodon/features/ui/index.js

@@ -56,6 +56,7 @@ const messages = defineMessages({
 const mapStateToProps = state => ({
   isComposing: state.getIn(['compose', 'is_composing']),
   hasComposingText: state.getIn(['compose', 'text']) !== '',
+  dropdownMenuIsOpen: state.getIn(['dropdown_menu', 'openId']) !== null,
 });
 
 const keyMap = {
@@ -184,6 +185,7 @@ export default class UI extends React.PureComponent {
     hasComposingText: PropTypes.bool,
     location: PropTypes.object,
     intl: PropTypes.object.isRequired,
+    dropdownMenuIsOpen: PropTypes.bool,
   };
 
   state = {
@@ -405,7 +407,7 @@ export default class UI extends React.PureComponent {
 
   render () {
     const { draggingOver } = this.state;
-    const { children, isComposing, location } = this.props;
+    const { children, isComposing, location, dropdownMenuIsOpen } = this.props;
 
     const handlers = {
       help: this.handleHotkeyToggleHelp,
@@ -428,7 +430,7 @@ export default class UI extends React.PureComponent {
 
     return (
       <HotKeys keyMap={keyMap} handlers={handlers} ref={this.setHotkeysRef}>
-        <div className={classNames('ui', { 'is-composing': isComposing })} ref={this.setRef}>
+        <div className={classNames('ui', { 'is-composing': isComposing })} ref={this.setRef} style={{ pointerEvents: dropdownMenuIsOpen ? 'none' : null }}>
           <TabsBar />
 
           <SwitchingColumnsArea location={location} onLayoutChange={this.handleLayoutChange}>

app/javascript/mastodon/reducers/dropdown_menu.js

+import Immutable from 'immutable';
+import {
+  DROPDOWN_MENU_OPEN,
+  DROPDOWN_MENU_CLOSE,
+} from '../actions/dropdown_menu';
+
+const initialState = Immutable.Map({ openId: null, placement: null });
+
+export default function dropdownMenu(state = initialState, action) {
+  switch (action.type) {
+  case DROPDOWN_MENU_OPEN:
+    return state.merge({ openId: action.id, placement: action.placement });
+  case DROPDOWN_MENU_CLOSE:
+    return state.get('openId') === action.id ? state.set('openId', null) : state;
+  default:
+    return state;
+  }
+}

app/javascript/mastodon/reducers/index.js

 import { combineReducers } from 'redux-immutable';
+import dropdown_menu from './dropdown_menu';
 import timelines from './timelines';
 import meta from './meta';
 import alerts from './alerts';
@@ -26,6 +27,7 @@ import lists from './lists';
 import listEditor from './list_editor';
 
 const reducers = {
+  dropdown_menu,
   timelines,
   meta,
   alerts,