Swap ui_opacity for panel_disabled

Simplify the API for disabling panels in the UI. `mx_fadable_faded` is applied instead of setting opacity.

src/components/structures/LeftPanel.js

@@ -19,6 +19,7 @@ limitations under the License.
 import React from 'react';
 import { DragDropContext } from 'react-dnd';
 import HTML5Backend from 'react-dnd-html5-backend';
+import classNames from 'classnames';
 import KeyCode from 'matrix-react-sdk/lib/KeyCode';
 import sdk from 'matrix-react-sdk';
 import dis from 'matrix-react-sdk/lib/dispatcher';
@@ -55,7 +56,7 @@ var LeftPanel = React.createClass({
         // We just need to update if any of these things change.
         if (
             this.props.collapsed !== nextProps.collapsed ||
-            this.props.opacity !== nextProps.opacity
+            this.props.disabled !== nextProps.disabled
         ) {
             return true;
         }
@@ -176,21 +177,16 @@ var LeftPanel = React.createClass({
             topBox = <SearchBox collapsed={ this.props.collapsed } onSearch={ this.onSearch } />;
         }
 
-        let classes = "mx_LeftPanel mx_fadable";
-        if (this.props.collapsed) {
-            classes += " collapsed";
-        }
+        let classes = classNames(
+            "mx_LeftPanel", "mx_fadable",
+            {
+                "collapsed": this.props.collapsed,
+                "mx_fadable_faded": this.props.disabled,
+            }
+        );
 
         return (
-            <aside className={classes}
-                style={{
-                    opacity: this.props.opacity,
-                    pointerEvents: this.props.opacity < 1.0 ? 'none' : undefined,
-                }}
-                onKeyDown={ this._onKeyDown }
-                onFocus={ this._onFocus }
-                onBlur={ this._onBlur }
-            >
+            <aside className={classes} onKeyDown={ this._onKeyDown } onFocus={ this._onFocus } onBlur={ this._onBlur }>
                 { topBox }
                 <CallPreview ConferenceHandler={VectorConferenceHandler} />
                 <RoomList

src/components/structures/RightPanel.js

@@ -18,6 +18,7 @@ limitations under the License.
 
 import React from 'react';
 import PropTypes from 'prop-types';
+import classNames from 'classnames';
 import { _t } from 'matrix-react-sdk/lib/languageHandler';
 import sdk from 'matrix-react-sdk';
 import dis from 'matrix-react-sdk/lib/dispatcher';
@@ -345,18 +346,16 @@ module.exports = React.createClass({
             );
         }
 
-        let classes = "mx_RightPanel mx_fadable";
-        if (this.props.collapsed) {
-            classes += " collapsed";
-        }
+        let classes = classNames(
+            "mx_RightPanel", "mx_fadable",
+            {
+                "collapsed": this.props.collapsed,
+                "mx_fadable_faded": this.props.disabled,
+            }
+        );
 
         return (
-            <aside className={classes}
-                style={{
-                    opacity: this.props.opacity,
-                    pointerEvents: this.props.opacity < 1.0 ? 'none' : undefined,
-                }}
-            >
+            <aside className={classes}>
                 <div className="mx_RightPanel_header">
                     <div className="mx_RightPanel_headerButtonGroup">
                         {headerButtons}

src/components/structures/RoomDirectory.js

@@ -89,17 +89,17 @@ module.exports = React.createClass({
         });
 
         // dis.dispatch({
-        //     action: 'ui_opacity',
-        //     sideOpacity: 0.3,
-        //     middleOpacity: 0.3,
+        //     action: 'panel_disable',
+        //     sideDisabled: true,
+        //     middleDisabled: true,
         // });
     },
 
     componentWillUnmount: function() {
         // dis.dispatch({
-        //     action: 'ui_opacity',
-        //     sideOpacity: 1.0,
-        //     middleOpacity: 1.0,
+        //     action: 'panel_disable',
+        //     sideDisabled: false,
+        //     middleDisabled: false,
         // });
         if (this.filterTimeout) {
             clearTimeout(this.filterTimeout);

src/skins/vector/css/_common.scss

@@ -87,6 +87,11 @@ textarea {
     transition: opacity 0.2s ease-in-out;
 }
 
+.mx_fadable.mx_fadable_faded {
+    opacity: 0.3;
+    pointer-events: none;
+}
+
 /* XXX: critical hack to GeminiScrollbar to allow them to work in FF 42 and Chrome 48.
    Stop the scrollbar view from pushing out the container's overall sizing, which causes
    flexbox to adapt to the new size and cause the view to keep growing.