make tab previews based on mouse idle time

app/common/constants/settingsEnums.js

@@ -21,6 +21,12 @@ const bookmarksToolbarMode = {
   FAVICONS_ONLY: 'faviconsOnly'
 }
 
+const tabPreviewTiming = {
+  LONG: 2000,
+  NORMAL: 1000,
+  SHORT: 500
+}
+
 const tabCloseAction = {
   LAST_ACTIVE: 'lastActive',
   NEXT: 'next',
@@ -41,6 +47,7 @@ module.exports = {
   startsWithOption,
   newTabMode,
   bookmarksToolbarMode,
+  tabPreviewTiming,
   tabCloseAction,
   fullscreenOption,
   autoplayOption

app/extensions/brave/locales/en-US/preferences.properties

@@ -381,3 +381,7 @@ urlBarOptions=URL Bar Options
 disableTitleMode=Always show the URL bar
 wideURLbar=Use wide URL bar
 autoplay=Autoplay Media
+tabPreviewTiming=Time to wait before previewing a tab
+long=Long
+normal=Normal
+short=Short

app/renderer/components/preferences/tabsTab.js

@@ -10,7 +10,7 @@ const {SettingsList, SettingItem, SettingCheckbox} = require('../common/settings
 
 const {SettingDropdown} = require('../common/dropdown')
 
-const {tabCloseAction} = require('../../../common/constants/settingsEnums')
+const {tabCloseAction, tabPreviewTiming} = require('../../../common/constants/settingsEnums')
 const {changeSetting} = require('../../lib/settingsUtil')
 const getSetting = require('../../../../js/settings').getSetting
 const settings = require('../../../../js/constants/settings')
@@ -36,6 +36,22 @@ class TabsTab extends ImmutableComponent {
       }
     ]
   }
+  get tabPreviewTimingOptions () {
+    return [
+      {
+        id: 'long',
+        action: tabPreviewTiming.LONG
+      },
+      {
+        id: 'normal',
+        action: tabPreviewTiming.NORMAL
+      },
+      {
+        id: 'short',
+        action: tabPreviewTiming.SHORT
+      }
+    ]
+  }
   render () {
     return (
       <div>
@@ -107,6 +123,26 @@ class TabsTab extends ImmutableComponent {
             settings={this.props.settings}
             onChangeSetting={this.props.onChangeSetting}
           />
+          {
+            getSetting(settings.SHOW_TAB_PREVIEWS, this.props.settings)
+              ? <SettingItem dataL10nId='tabPreviewTiming'>
+                <SettingDropdown
+                  value={getSetting(settings.TAB_PREVIEW_TIMING, this.props.settings)}
+                  onChange={changeSetting.bind(null, this.props.onChangeSetting, settings.TAB_PREVIEW_TIMING)}>
+                  {this.tabPreviewTimingOptions.map(option =>
+                    <option
+                      data-l10n-id={option.id}
+                      data-test-id='tabPreviewTimingOption'
+                      data-test-active={
+                        getSetting(settings.TAB_PREVIEW_TIMING, this.props.settings) === option.action
+                      }
+                      value={option.action}
+                    />
+                  )}
+                </SettingDropdown>
+              </SettingItem>
+              : null
+          }
           <SettingItem dataL10nId='dashboardSettingsTitle'>
             <SettingCheckbox
               dataL10nId='dashboardShowImages'

app/renderer/components/styles/tab.js

@@ -83,7 +83,9 @@ const styles = StyleSheet.create({
     alignItems: 'center',
     display: 'flex',
     flex: '1',
-    minWidth: '0' // @see https://bugzilla.mozilla.org/show_bug.cgi?id=1108514#c5
+    minWidth: '0', // @see https://bugzilla.mozilla.org/show_bug.cgi?id=1108514#c5
+    // prevent the icons wrapper from being the target of mouse events.
+    pointerEvents: 'none'
   },
 
   isPinned: {

app/renderer/components/tabs/content/tabTitle.js

@@ -72,7 +72,9 @@ const styles = StyleSheet.create({
     lineHeight: '1.6',
     padding: globalStyles.spacing.defaultTabPadding,
     color: 'transparent',
-    WebkitBackgroundClip: 'text'
+    WebkitBackgroundClip: 'text',
+    // prevents the title from being the target of mouse events.
+    pointerEvents: 'none'
   },
 
   enforceFontVisibility: {

app/renderer/components/tabs/tab.js

@@ -41,15 +41,20 @@ const contextMenus = require('../../../../js/contextMenus')
 const dnd = require('../../../../js/dnd')
 const throttle = require('../../../../js/lib/throttle')
 const frameStateUtil = require('../../../../js/state/frameStateUtil')
-const {getTabBreakpoint, tabUpdateFrameRate} = require('../../lib/tabUtil')
+const {
+  getTabBreakpoint,
+  tabUpdateFrameRate,
+  hasBreakpoint,
+  hasTabAsRelatedTarget
+} = require('../../lib/tabUtil')
 const isWindows = require('../../../common/lib/platformUtil').isWindows()
 const {getCurrentWindowId} = require('../../currentWindow')
 const UrlUtil = require('../../../../js/lib/urlutil')
-const {hasBreakpoint} = require('../../lib/tabUtil')
 
 class Tab extends React.Component {
   constructor (props) {
     super(props)
+    this.onMouseMove = this.onMouseMove.bind(this)
     this.onMouseEnter = this.onMouseEnter.bind(this)
     this.onMouseLeave = this.onMouseLeave.bind(this)
     this.onUpdateTabSize = this.onUpdateTabSize.bind(this)
@@ -129,12 +134,22 @@ class Tab extends React.Component {
     dnd.onDragOver(dragTypes.TAB, this.tabNode.getBoundingClientRect(), this.props.frameKey, this.draggingOverData, e)
   }
 
-  onMouseLeave () {
-    windowActions.setTabHoverState(this.props.frameKey, false)
+  onMouseLeave (e) {
+    // mouseleave will keep the previewMode
+    // as long as the related target is another tab
+    windowActions.setTabHoverState(this.props.frameKey, false, hasTabAsRelatedTarget(e))
   }
 
   onMouseEnter (e) {
-    windowActions.setTabHoverState(this.props.frameKey, true)
+    // if mouse entered a tab we only trigger a new preview
+    // if user is in previewMode, which is defined by mouse move
+    windowActions.setTabHoverState(this.props.frameKey, true, this.props.previewMode)
+  }
+
+  onMouseMove () {
+    // dispatch a message to the store so it can delay
+    // and preview the tab based on mouse idle time
+    windowActions.onTabMouseMove(this.props.frameKey)
   }
 
   onAuxClick (e) {
@@ -258,6 +273,7 @@ class Tab extends React.Component {
     props.dragData = state.getIn(['dragData', 'type']) === dragTypes.TAB && state.get('dragData')
     props.hasTabInFullScreen = tabContentState.hasTabInFullScreen(currentWindow)
     props.tabId = tabId
+    props.previewMode = currentWindow.getIn(['ui', 'tabs', 'previewMode'])
 
     return props
   }
@@ -275,6 +291,7 @@ class Tab extends React.Component {
       }
     })
     return <div
+      data-tab-area
       className={cx({
         tabArea: true,
         draggingOverLeft: this.isDraggingOverLeft && !this.isDraggingOverSelf,
@@ -284,6 +301,7 @@ class Tab extends React.Component {
         partOfFullPageSet: this.props.partOfFullPageSet || !!this.props.tabWidth
       })}
       style={this.props.tabWidth ? { flex: `0 0 ${this.props.tabWidth}px` } : {}}
+      onMouseMove={this.onMouseMove}
       onMouseEnter={this.onMouseEnter}
       onMouseLeave={this.onMouseLeave}>
       {
@@ -292,6 +310,7 @@ class Tab extends React.Component {
           : null
       }
       <div
+        data-tab
         ref={(node) => { this.tabNode = node }}
         className={css(
           styles.tab,

app/renderer/lib/tabUtil.js

@@ -36,3 +36,17 @@ module.exports.hasBreakpoint = (breakpoint, arr) => {
   arr = Array.isArray(arr) ? arr : [arr]
   return arr.includes(breakpoint)
 }
+
+/**
+ * Check whether or not the related target is a tab
+ * by checking the parentNode dataset
+ * @param {Object} event - The mouse event
+ * @returns {Boolean} Whether or not the related target is a tab
+ */
+module.exports.hasTabAsRelatedTarget = (event) => {
+  const relatedTarget = event.relatedTarget
+  const hasDataset = relatedTarget.parentNode && relatedTarget.parentNode.dataset
+  const tabAsRelatedTarget = hasDataset.tab || hasDataset.tabArea
+
+  return hasDataset && tabAsRelatedTarget
+}

app/renderer/reducers/frameReducer.js

@@ -37,6 +37,7 @@ const closeFrame = (state, action) => {
 
   const frameProps = frameStateUtil.getFrameByKey(state, action.frameKey)
   const hoverState = frameStateUtil.getTabHoverState(state, action.frameKey)
+  const previewMode = state.getIn(['ui', 'tabs', 'previewMode'])
 
   state = state.merge(frameStateUtil.removeFrame(
     state,
@@ -57,7 +58,8 @@ const closeFrame = (state, action) => {
     // This allow us to have closeTab button visible for sequential frames closing,
     // until onMouseLeave event happens.
     if (hoverState) {
-      state = frameStateUtil.setTabHoverState(state, nextFrame.get('key'), hoverState)
+      state = frameStateUtil
+        .setTabHoverState(state, nextFrame.get('key'), hoverState, previewMode)
     }
   } else if (hoverState && frameStateUtil.getPreviewFrameKey(state) === action.frameKey) {
     state = frameStateUtil.setPreviewFrameKey(state, null)

docs/state.md

@@ -705,8 +705,9 @@ WindowStore
     size: array, // last known window size [x, y]
     tabs: {
       hoverTabIndex: number, // index of the current hovered tab
-      tabPageIndex: number, // index of the current tab page
-      previewTabPageIndex: number // index of the tab being previewed
+      previewMode: boolean, // whether or not tab preview should be fired based on mouse idle time
+      previewTabPageIndex: number, // index of the tab being previewed
+      tabPageIndex: number // index of the current tab page
     },
   },
   widevinePanelDetail: {

js/actions/windowActions.js

@@ -242,20 +242,6 @@ const windowActions = {
     })
   },
 
-  /**
-   * Dispatches a message to the store to set a preview frame.
-   * This should only be called internally by `WINDOW_SET_TAB_HOVER_STATE`
-   * when we need to delay updating the preview frame value
-   *
-   * @param {Object} frameKey - the frame key for the webview in question.
-   */
-  setPreviewFrame: function (frameKey) {
-    dispatch({
-      actionType: windowConstants.WINDOW_SET_PREVIEW_FRAME,
-      frameKey
-    })
-  },
-
   /**
    * Dispatches a message to the store to set the tab page index.
    *
@@ -287,12 +273,15 @@ const windowActions = {
    *
    * @param {Object} frameKey - the frame key for the webview in question.
    * @param {boolean} hoverState - whether or not mouse is over tab
+   * @param {boolean} previewMode - whether or not the next tab should be previewed
+   * based on mouse idle time
    */
-  setTabHoverState: function (frameKey, hoverState) {
+  setTabHoverState: function (frameKey, hoverState, previewMode) {
     dispatch({
       actionType: windowConstants.WINDOW_SET_TAB_HOVER_STATE,
       frameKey,
-      hoverState
+      hoverState,
+      previewMode
     })
   },
 
@@ -1056,6 +1045,13 @@ const windowActions = {
     })
   },
 
+  onTabMouseMove: function (data) {
+    dispatch({
+      actionType: windowConstants.WINDOW_TAB_MOUSE_MOVE,
+      data
+    })
+  },
+
   onTabMouseLeave: function (data) {
     dispatch({
       actionType: windowConstants.WINDOW_TAB_MOUSE_LEAVE,

js/constants/appConfig.js

@@ -142,6 +142,7 @@ module.exports = {
     'tabs.tabs-per-page': 20,
     'tabs.close-action': 'parent',
     'tabs.show-tab-previews': true,
+    'tabs.preview-timing': 1000,
     'tabs.show-dashboard-images': true,
     'privacy.history-suggestions': true,
     'privacy.bookmark-suggestions': true,

js/constants/settings.js

@@ -28,6 +28,7 @@ const settings = {
   PAINT_TABS: 'tabs.paint-tabs',
   TABS_PER_PAGE: 'tabs.tabs-per-page',
   SHOW_TAB_PREVIEWS: 'tabs.show-tab-previews',
+  TAB_PREVIEW_TIMING: 'tabs.preview-timing',
   SHOW_DASHBOARD_IMAGES: 'tabs.show-dashboard-images',
   // Privacy Tab
   HISTORY_SUGGESTIONS: 'privacy.history-suggestions',

js/constants/windowConstants.js

@@ -10,7 +10,6 @@ const windowConstants = {
   WINDOW_CLOSE_FRAME: _,
   WINDOW_CLOSE_FRAMES: _,
   WINDOW_SET_FOCUSED_FRAME: _,
-  WINDOW_SET_PREVIEW_FRAME: _,
   WINDOW_SET_PREVIEW_TAB_PAGE_INDEX: _,
   WINDOW_SET_TAB_PAGE_INDEX: _,
   WINDOW_SET_TAB_BREAKPOINT: _,
@@ -82,6 +81,7 @@ const windowConstants = {
   WINDOW_AUTOFILL_SELECTION_CLICKED: _,
   WINDOW_AUTOFILL_POPUP_HIDDEN: _,
   WINDOW_TAB_CLOSED_WITH_MOUSE: _,
+  WINDOW_TAB_MOUSE_MOVE: _,
   WINDOW_TAB_MOUSE_LEAVE: _,
   WINDOW_FRAME_MOUSE_ENTER: _,
   WINDOW_FRAME_MOUSE_LEAVE: _,