ui/src/frontend/viewer_page.ts - third_party/perfetto - Git at Google

 // Copyright (C) 2018 The Android Open Source Project
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 import * as m from 'mithril';

 import {Actions} from '../common/actions';
 import {LogExists, LogExistsKey} from '../common/logs';
 import {QueryResponse} from '../common/queries';
 import {TimeSpan} from '../common/time';

 import {ChromeSliceDetailsPanel} from './chrome_slice_panel';
 import {copyToClipboard} from './clipboard';
 import {CounterDetailsPanel} from './counter_panel';
 import {DragGestureHandler} from './drag_gesture_handler';
 import {globals} from './globals';
 import {HeapProfileDetailsPanel} from './heap_profile_panel';
 import {LogPanel} from './logs_panel';
 import {NotesEditorPanel, NotesPanel} from './notes_panel';
 import {OverviewTimelinePanel} from './overview_timeline_panel';
 import {createPage} from './pages';
 import {PanAndZoomHandler} from './pan_and_zoom_handler';
 import {Panel} from './panel';
 import {AnyAttrsVnode, PanelContainer} from './panel_container';
 import {SliceDetailsPanel} from './slice_panel';
 import {ThreadStatePanel} from './thread_state_panel';
 import {TickmarkPanel} from './tickmark_panel';
 import {TimeAxisPanel} from './time_axis_panel';
 import {computeZoom} from './time_scale';
 import {TimeSelectionPanel} from './time_selection_panel';
 import {TRACK_SHELL_WIDTH} from './track_constants';
 import {TrackGroupPanel} from './track_group_panel';
 import {TrackPanel} from './track_panel';
 import {VideoPanel} from './video_panel';

 const DRAG_HANDLE_HEIGHT_PX = 28;
 const DEFAULT_DETAILS_HEIGHT_PX = 230 + DRAG_HANDLE_HEIGHT_PX;
 const UP_ICON = 'keyboard_arrow_up';
 const DOWN_ICON = 'keyboard_arrow_down';
 const SIDEBAR_WIDTH = 256;

 function hasLogs(): boolean {
   const data = globals.trackDataStore.get(LogExistsKey) as LogExists;
   return data && data.exists;
 }

 class QueryTable extends Panel {
   view() {
     const resp = globals.queryResults.get('command') as QueryResponse;
     if (resp === undefined) {
       return m('');
     }
     const cols = [];
     for (const col of resp.columns) {
       cols.push(m('td', col));
     }
     const header = m('tr', cols);

     const rows = [];
     for (let i = 0; i < resp.rows.length; i++) {
       const cells = [];
       for (const col of resp.columns) {
         cells.push(m('td', resp.rows[i][col]));
       }
       rows.push(m('tr', cells));
     }
     return m(
         'div',
         m('header.overview',
           `Query result - ${Math.round(resp.durationMs)} ms`,
           m('span.code', resp.query),
           resp.error ? null :
                        m('button.query-ctrl',
                          {
                            onclick: () => {
                              const lines: string[][] = [];
                              lines.push(resp.columns);
                              for (const row of resp.rows) {
                                const line = [];
                                for (const col of resp.columns) {
                                  line.push(row[col].toString());
                                }
                                lines.push(line);
                              }
                              copyToClipboard(
                                  lines.map(line => line.join('\t')).join('\n'));
                            },
                          },
                          'Copy as .tsv'),
           m('button.query-ctrl',
             {
               onclick: () => {
                 globals.queryResults.delete('command');
                 globals.rafScheduler.scheduleFullRedraw();
               }
             },
             'Close'), ),
         resp.error ?
             m('.query-error', `SQL error: ${resp.error}`) :
             m('table.query-table', m('thead', header), m('tbody', rows)));
   }

   renderCanvas() {}
 }

 interface DragHandleAttrs {
   height: number;
   resize: (height: number) => void;
 }

 class DragHandle implements m.ClassComponent<DragHandleAttrs> {
   private dragStartHeight = 0;
   private height = 0;
   private resize: (height: number) => void = () => {};
   private isClosed = this.height <= DRAG_HANDLE_HEIGHT_PX;

   oncreate({dom, attrs}: m.CVnodeDOM<DragHandleAttrs>) {
     this.resize = attrs.resize;
     this.height = attrs.height;
     this.isClosed = this.height <= DRAG_HANDLE_HEIGHT_PX;
     const elem = dom as HTMLElement;
     new DragGestureHandler(
         elem,
         this.onDrag.bind(this),
         this.onDragStart.bind(this),
         this.onDragEnd.bind(this));
   }

   onupdate({attrs}: m.CVnodeDOM<DragHandleAttrs>) {
     this.resize = attrs.resize;
     this.height = attrs.height;
     this.isClosed = this.height <= DRAG_HANDLE_HEIGHT_PX;
   }

   onDrag(_x: number, y: number) {
     const newHeight = this.dragStartHeight + (DRAG_HANDLE_HEIGHT_PX / 2) - y;
     this.isClosed = Math.floor(newHeight) <= DRAG_HANDLE_HEIGHT_PX;
     this.resize(Math.floor(newHeight));
     globals.rafScheduler.scheduleFullRedraw();
   }

   onDragStart(_x: number, _y: number) {
     this.dragStartHeight = this.height;
   }

   onDragEnd() {}

   view() {
     const icon = this.isClosed ? UP_ICON : DOWN_ICON;
     const title = this.isClosed ? 'Show panel' : 'Hide panel';
     return m(
         '.handle',
         m('.handle-title', 'Current Selection'),
         m('i.material-icons',
           {
             onclick: () => {
               if (this.height === DRAG_HANDLE_HEIGHT_PX) {
                 this.isClosed = false;
                 this.resize(DEFAULT_DETAILS_HEIGHT_PX);
               } else {
                 this.isClosed = true;
                 this.resize(DRAG_HANDLE_HEIGHT_PX);
               }
               globals.rafScheduler.scheduleFullRedraw();
             },
             title
           },
           icon));
   }
 }

 // Checks if the mousePos is within 3px of the start or end of the
 // current selected time range.
 function onTimeRangeBoundary(mousePos: number): 'START'|'END'|null {
   const startSec = globals.frontendLocalState.selectedTimeRange.startSec;
   const endSec = globals.frontendLocalState.selectedTimeRange.endSec;
   if (startSec !== undefined && endSec !== undefined) {
     const start = globals.frontendLocalState.timeScale.timeToPx(startSec);
     const end = globals.frontendLocalState.timeScale.timeToPx(endSec);
     const startDrag = mousePos - TRACK_SHELL_WIDTH;
     const startDistance = Math.abs(start - startDrag);
     const endDistance = Math.abs(end - startDrag);
     const range = 3 * window.devicePixelRatio;
     // We might be within 3px of both boundaries but we should choose
     // the closest one.
     if (startDistance < range && startDistance <= endDistance) return 'START';
     if (endDistance < range && endDistance <= startDistance) return 'END';
   }
   return null;
 }

 /**
  * Top-most level component for the viewer page. Holds tracks, brush timeline,
  * panels, and everything else that's part of the main trace viewer page.
  */
 class TraceViewer implements m.ClassComponent {
   private onResize: () => void = () => {};
   private zoomContent?: PanAndZoomHandler;
   private detailsHeight = DRAG_HANDLE_HEIGHT_PX;
   // Used to set details panel to default height on selection.
   private showDetailsPanel = true;
   // Used to prevent global deselection if a pan/drag select occurred.
   private keepCurrentSelection = false;

   oncreate(vnode: m.CVnodeDOM) {
     const frontendLocalState = globals.frontendLocalState;
     const updateDimensions = () => {
       const rect = vnode.dom.getBoundingClientRect();
       frontendLocalState.timeScale.setLimitsPx(
           0, rect.width - TRACK_SHELL_WIDTH);
     };

     updateDimensions();

     // TODO: Do resize handling better.
     this.onResize = () => {
       updateDimensions();
       globals.rafScheduler.scheduleFullRedraw();
     };

     // Once ResizeObservers are out, we can stop accessing the window here.
     window.addEventListener('resize', this.onResize);

     const panZoomEl =
         vnode.dom.querySelector('.pan-and-zoom-content') as HTMLElement;

     this.zoomContent = new PanAndZoomHandler({
       element: panZoomEl,
       contentOffsetX: SIDEBAR_WIDTH,
       onPanned: (pannedPx: number) => {
         this.keepCurrentSelection = true;
         const traceTime = globals.state.traceTime;
         const vizTime = globals.frontendLocalState.visibleWindowTime;
         const origDelta = vizTime.duration;
         const tDelta = frontendLocalState.timeScale.deltaPxToDuration(pannedPx);
         let tStart = vizTime.start + tDelta;
         let tEnd = vizTime.end + tDelta;
         if (tStart < traceTime.startSec) {
           tStart = traceTime.startSec;
           tEnd = tStart + origDelta;
         } else if (tEnd > traceTime.endSec) {
           tEnd = traceTime.endSec;
           tStart = tEnd - origDelta;
         }
         frontendLocalState.updateVisibleTime(new TimeSpan(tStart, tEnd));
         globals.rafScheduler.scheduleRedraw();
       },
       onZoomed: (zoomedPositionPx: number, zoomRatio: number) => {
         // TODO(hjd): Avoid hardcoding TRACK_SHELL_WIDTH.
         // TODO(hjd): Improve support for zooming in overview timeline.
         const span = frontendLocalState.visibleWindowTime;
         const scale = frontendLocalState.timeScale;
         const zoomPx = zoomedPositionPx - TRACK_SHELL_WIDTH;
         const newSpan = computeZoom(scale, span, 1 - zoomRatio, zoomPx);
         frontendLocalState.updateVisibleTime(newSpan);
         globals.rafScheduler.scheduleRedraw();
       },
       shouldDrag: (currentPx: number) => {
         return onTimeRangeBoundary(currentPx) !== null;
       },
       onDrag: (
           dragStartPx: number,
           prevPx: number,
           currentPx: number,
           editing: boolean) => {
         const traceTime = globals.state.traceTime;
         const scale = frontendLocalState.timeScale;
         this.keepCurrentSelection = true;
         if (editing) {
           const startSec = frontendLocalState.selectedTimeRange.startSec;
           const endSec = frontendLocalState.selectedTimeRange.endSec;
           if (startSec !== undefined && endSec !== undefined) {
             const newTime = scale.pxToTime(currentPx - TRACK_SHELL_WIDTH);
             // Have to check again for when one boundary crosses over the other.
             const curBoundary = onTimeRangeBoundary(prevPx);
             if (curBoundary == null) return;
             const keepTime = curBoundary === 'START' ? endSec : startSec;
             frontendLocalState.selectTimeRange(
                 Math.max(Math.min(keepTime, newTime), traceTime.startSec),
                 Math.min(Math.max(keepTime, newTime), traceTime.endSec));
           }
         } else {
           frontendLocalState.setShowTimeSelectPreview(false);
           const dragStartTime = scale.pxToTime(dragStartPx - TRACK_SHELL_WIDTH);
           const dragEndTime = scale.pxToTime(currentPx - TRACK_SHELL_WIDTH);
           frontendLocalState.selectTimeRange(
               Math.max(
                   Math.min(dragStartTime, dragEndTime), traceTime.startSec),
               Math.min(Math.max(dragStartTime, dragEndTime), traceTime.endSec));
         }
         globals.rafScheduler.scheduleRedraw();
       }
     });
   }

   onremove() {
     window.removeEventListener('resize', this.onResize);
     if (this.zoomContent) this.zoomContent.shutdown();
   }

   view() {
     const scrollingPanels: AnyAttrsVnode[] =
         globals.state.scrollingTracks.map(id => m(TrackPanel, {key: id, id}));

     for (const group of Object.values(globals.state.trackGroups)) {
       scrollingPanels.push(m(TrackGroupPanel, {
         trackGroupId: group.id,
         key: `trackgroup-${group.id}`,
       }));
       if (group.collapsed) continue;
       for (const trackId of group.tracks) {
         scrollingPanels.push(m(TrackPanel, {
           key: `track-${group.id}-${trackId}`,
           id: trackId,
         }));
       }
     }
     scrollingPanels.unshift(m(QueryTable, {key: 'query'}));

     const detailsPanels: AnyAttrsVnode[] = [];
     const curSelection = globals.state.currentSelection;
     if (curSelection) {
       switch (curSelection.kind) {
         case 'NOTE':
           detailsPanels.push(m(NotesEditorPanel, {
             key: 'notes',
             id: curSelection.id,
           }));
           break;
         case 'SLICE':
           detailsPanels.push(m(SliceDetailsPanel, {
             key: 'slice',
           }));
           break;
         case 'COUNTER':
           detailsPanels.push(m(CounterDetailsPanel, {
             key: 'counter',
           }));
           break;
         case 'HEAP_PROFILE':
           detailsPanels.push(m(HeapProfileDetailsPanel, {key: 'heap_profile'}));
           break;
         case 'CHROME_SLICE':
           detailsPanels.push(m(ChromeSliceDetailsPanel));
           break;
         case 'THREAD_STATE':
           detailsPanels.push(m(ThreadStatePanel, {
             key: 'thread_state',
             ts: curSelection.ts,
             dur: curSelection.dur,
             utid: curSelection.utid,
             state: curSelection.state,
             cpu: curSelection.cpu
           }));
           break;
         default:
           break;
       }
     } else if (hasLogs()) {
       detailsPanels.push(m(LogPanel, {}));
     }

     const wasShowing = this.showDetailsPanel;
     this.showDetailsPanel = detailsPanels.length > 0;
     // Pop up details panel on first selection.
     if (!wasShowing && this.showDetailsPanel &&
         this.detailsHeight === DRAG_HANDLE_HEIGHT_PX) {
       this.detailsHeight = DEFAULT_DETAILS_HEIGHT_PX;
     }

     return m(
         '.page',
         m('.split-panel',
           m('.pan-and-zoom-content',
             {
               onclick: () => {
                 // We don't want to deselect when panning/drag selecting.
                 if (this.keepCurrentSelection) {
                   this.keepCurrentSelection = false;
                   return;
                 }
                 globals.makeSelection(Actions.deselect({}));
               }
             },
             m('.pinned-panel-container', m(PanelContainer, {
                 doesScroll: false,
                 panels: [
                   m(OverviewTimelinePanel, {key: 'overview'}),
                   m(TimeAxisPanel, {key: 'timeaxis'}),
                   m(TimeSelectionPanel, {key: 'timeselection'}),
                   m(NotesPanel, {key: 'notes'}),
                   m(TickmarkPanel, {key: 'searchTickmarks'}),
                   ...globals.state.pinnedTracks.map(
                       id => m(TrackPanel, {key: id, id})),
                 ],
                 kind: 'OVERVIEW',
               })),
             m('.scrolling-panel-container', m(PanelContainer, {
                 doesScroll: true,
                 panels: scrollingPanels,
                 kind: 'TRACKS',
               }))),
           m('.video-panel',
             (globals.state.videoEnabled && globals.state.video != null) ?
                 m(VideoPanel) :
                 null)),
         m('.details-content',
           {
             style: {
               height: `${this.detailsHeight}px`,
               display: this.showDetailsPanel ? null : 'none'
             }
           },
           m(DragHandle, {
             resize: (height: number) => {
               this.detailsHeight = Math.max(height, DRAG_HANDLE_HEIGHT_PX);
             },
             height: this.detailsHeight,
           }),
           m('.details-panel-container',
             m(PanelContainer,
               {doesScroll: true, panels: detailsPanels, kind: 'DETAILS'}))));
   }
 }

 export const ViewerPage = createPage({
   view() {
     return m(TraceViewer);
   }
 });
	// Copyright (C) 2018 The Android Open Source Project
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	import * as m from 'mithril';

	import {Actions} from '../common/actions';
	import {LogExists, LogExistsKey} from '../common/logs';
	import {QueryResponse} from '../common/queries';
	import {TimeSpan} from '../common/time';

	import {ChromeSliceDetailsPanel} from './chrome_slice_panel';
	import {copyToClipboard} from './clipboard';
	import {CounterDetailsPanel} from './counter_panel';
	import {DragGestureHandler} from './drag_gesture_handler';
	import {globals} from './globals';
	import {HeapProfileDetailsPanel} from './heap_profile_panel';
	import {LogPanel} from './logs_panel';
	import {NotesEditorPanel, NotesPanel} from './notes_panel';
	import {OverviewTimelinePanel} from './overview_timeline_panel';
	import {createPage} from './pages';
	import {PanAndZoomHandler} from './pan_and_zoom_handler';
	import {Panel} from './panel';
	import {AnyAttrsVnode, PanelContainer} from './panel_container';
	import {SliceDetailsPanel} from './slice_panel';
	import {ThreadStatePanel} from './thread_state_panel';
	import {TickmarkPanel} from './tickmark_panel';
	import {TimeAxisPanel} from './time_axis_panel';
	import {computeZoom} from './time_scale';
	import {TimeSelectionPanel} from './time_selection_panel';
	import {TRACK_SHELL_WIDTH} from './track_constants';
	import {TrackGroupPanel} from './track_group_panel';
	import {TrackPanel} from './track_panel';
	import {VideoPanel} from './video_panel';

	const DRAG_HANDLE_HEIGHT_PX = 28;
	const DEFAULT_DETAILS_HEIGHT_PX = 230 + DRAG_HANDLE_HEIGHT_PX;
	const UP_ICON = 'keyboard_arrow_up';
	const DOWN_ICON = 'keyboard_arrow_down';
	const SIDEBAR_WIDTH = 256;

	function hasLogs(): boolean {
	const data = globals.trackDataStore.get(LogExistsKey) as LogExists;
	return data && data.exists;
	}

	class QueryTable extends Panel {
	view() {
	const resp = globals.queryResults.get('command') as QueryResponse;
	if (resp === undefined) {
	return m('');
	}
	const cols = [];
	for (const col of resp.columns) {
	cols.push(m('td', col));
	}
	const header = m('tr', cols);

	const rows = [];
	for (let i = 0; i < resp.rows.length; i++) {
	const cells = [];
	for (const col of resp.columns) {
	cells.push(m('td', resp.rows[i][col]));
	}
	rows.push(m('tr', cells));
	}
	return m(
	'div',
	m('header.overview',
	`Query result - ${Math.round(resp.durationMs)} ms`,
	m('span.code', resp.query),
	resp.error ? null :
	m('button.query-ctrl',
	{
	onclick: () => {
	const lines: string[][] = [];
	lines.push(resp.columns);
	for (const row of resp.rows) {
	const line = [];
	for (const col of resp.columns) {
	line.push(row[col].toString());
	}
	lines.push(line);
	}
	copyToClipboard(
	lines.map(line => line.join('\t')).join('\n'));
	},
	},
	'Copy as .tsv'),
	m('button.query-ctrl',
	{
	onclick: () => {
	globals.queryResults.delete('command');
	globals.rafScheduler.scheduleFullRedraw();
	}
	},
	'Close'), ),
	resp.error ?
	m('.query-error', `SQL error: ${resp.error}`) :
	m('table.query-table', m('thead', header), m('tbody', rows)));
	}

	renderCanvas() {}
	}

	interface DragHandleAttrs {
	height: number;
	resize: (height: number) => void;
	}

	class DragHandle implements m.ClassComponent<DragHandleAttrs> {
	private dragStartHeight = 0;
	private height = 0;
	private resize: (height: number) => void = () => {};
	private isClosed = this.height <= DRAG_HANDLE_HEIGHT_PX;

	oncreate({dom, attrs}: m.CVnodeDOM<DragHandleAttrs>) {
	this.resize = attrs.resize;
	this.height = attrs.height;
	this.isClosed = this.height <= DRAG_HANDLE_HEIGHT_PX;
	const elem = dom as HTMLElement;
	new DragGestureHandler(
	elem,
	this.onDrag.bind(this),
	this.onDragStart.bind(this),
	this.onDragEnd.bind(this));
	}

	onupdate({attrs}: m.CVnodeDOM<DragHandleAttrs>) {
	this.resize = attrs.resize;
	this.height = attrs.height;
	this.isClosed = this.height <= DRAG_HANDLE_HEIGHT_PX;
	}

	onDrag(_x: number, y: number) {
	const newHeight = this.dragStartHeight + (DRAG_HANDLE_HEIGHT_PX / 2) - y;
	this.isClosed = Math.floor(newHeight) <= DRAG_HANDLE_HEIGHT_PX;
	this.resize(Math.floor(newHeight));
	globals.rafScheduler.scheduleFullRedraw();
	}

	onDragStart(_x: number, _y: number) {
	this.dragStartHeight = this.height;
	}

	onDragEnd() {}

	view() {
	const icon = this.isClosed ? UP_ICON : DOWN_ICON;
	const title = this.isClosed ? 'Show panel' : 'Hide panel';
	return m(
	'.handle',
	m('.handle-title', 'Current Selection'),
	m('i.material-icons',
	{
	onclick: () => {
	if (this.height === DRAG_HANDLE_HEIGHT_PX) {
	this.isClosed = false;
	this.resize(DEFAULT_DETAILS_HEIGHT_PX);
	} else {
	this.isClosed = true;
	this.resize(DRAG_HANDLE_HEIGHT_PX);
	}
	globals.rafScheduler.scheduleFullRedraw();
	},
	title
	},
	icon));
	}
	}

	// Checks if the mousePos is within 3px of the start or end of the
	// current selected time range.
	function onTimeRangeBoundary(mousePos: number): 'START'\|'END'\|null {
	const startSec = globals.frontendLocalState.selectedTimeRange.startSec;
	const endSec = globals.frontendLocalState.selectedTimeRange.endSec;
	if (startSec !== undefined && endSec !== undefined) {
	const start = globals.frontendLocalState.timeScale.timeToPx(startSec);
	const end = globals.frontendLocalState.timeScale.timeToPx(endSec);
	const startDrag = mousePos - TRACK_SHELL_WIDTH;
	const startDistance = Math.abs(start - startDrag);
	const endDistance = Math.abs(end - startDrag);
	const range = 3 * window.devicePixelRatio;
	// We might be within 3px of both boundaries but we should choose
	// the closest one.
	if (startDistance < range && startDistance <= endDistance) return 'START';
	if (endDistance < range && endDistance <= startDistance) return 'END';
	}
	return null;
	}

	/**
	* Top-most level component for the viewer page. Holds tracks, brush timeline,
	* panels, and everything else that's part of the main trace viewer page.
	*/
	class TraceViewer implements m.ClassComponent {
	private onResize: () => void = () => {};
	private zoomContent?: PanAndZoomHandler;
	private detailsHeight = DRAG_HANDLE_HEIGHT_PX;
	// Used to set details panel to default height on selection.
	private showDetailsPanel = true;
	// Used to prevent global deselection if a pan/drag select occurred.
	private keepCurrentSelection = false;

	oncreate(vnode: m.CVnodeDOM) {
	const frontendLocalState = globals.frontendLocalState;
	const updateDimensions = () => {
	const rect = vnode.dom.getBoundingClientRect();
	frontendLocalState.timeScale.setLimitsPx(
	0, rect.width - TRACK_SHELL_WIDTH);
	};

	updateDimensions();

	// TODO: Do resize handling better.
	this.onResize = () => {
	updateDimensions();
	globals.rafScheduler.scheduleFullRedraw();
	};

	// Once ResizeObservers are out, we can stop accessing the window here.
	window.addEventListener('resize', this.onResize);

	const panZoomEl =
	vnode.dom.querySelector('.pan-and-zoom-content') as HTMLElement;

	this.zoomContent = new PanAndZoomHandler({
	element: panZoomEl,
	contentOffsetX: SIDEBAR_WIDTH,
	onPanned: (pannedPx: number) => {
	this.keepCurrentSelection = true;
	const traceTime = globals.state.traceTime;
	const vizTime = globals.frontendLocalState.visibleWindowTime;
	const origDelta = vizTime.duration;
	const tDelta = frontendLocalState.timeScale.deltaPxToDuration(pannedPx);
	let tStart = vizTime.start + tDelta;
	let tEnd = vizTime.end + tDelta;
	if (tStart < traceTime.startSec) {
	tStart = traceTime.startSec;
	tEnd = tStart + origDelta;
	} else if (tEnd > traceTime.endSec) {
	tEnd = traceTime.endSec;
	tStart = tEnd - origDelta;
	}
	frontendLocalState.updateVisibleTime(new TimeSpan(tStart, tEnd));
	globals.rafScheduler.scheduleRedraw();
	},
	onZoomed: (zoomedPositionPx: number, zoomRatio: number) => {
	// TODO(hjd): Avoid hardcoding TRACK_SHELL_WIDTH.
	// TODO(hjd): Improve support for zooming in overview timeline.
	const span = frontendLocalState.visibleWindowTime;
	const scale = frontendLocalState.timeScale;
	const zoomPx = zoomedPositionPx - TRACK_SHELL_WIDTH;
	const newSpan = computeZoom(scale, span, 1 - zoomRatio, zoomPx);
	frontendLocalState.updateVisibleTime(newSpan);
	globals.rafScheduler.scheduleRedraw();
	},
	shouldDrag: (currentPx: number) => {
	return onTimeRangeBoundary(currentPx) !== null;
	},
	onDrag: (
	dragStartPx: number,
	prevPx: number,
	currentPx: number,
	editing: boolean) => {
	const traceTime = globals.state.traceTime;
	const scale = frontendLocalState.timeScale;
	this.keepCurrentSelection = true;
	if (editing) {
	const startSec = frontendLocalState.selectedTimeRange.startSec;
	const endSec = frontendLocalState.selectedTimeRange.endSec;
	if (startSec !== undefined && endSec !== undefined) {
	const newTime = scale.pxToTime(currentPx - TRACK_SHELL_WIDTH);
	// Have to check again for when one boundary crosses over the other.
	const curBoundary = onTimeRangeBoundary(prevPx);
	if (curBoundary == null) return;
	const keepTime = curBoundary === 'START' ? endSec : startSec;
	frontendLocalState.selectTimeRange(
	Math.max(Math.min(keepTime, newTime), traceTime.startSec),
	Math.min(Math.max(keepTime, newTime), traceTime.endSec));
	}
	} else {
	frontendLocalState.setShowTimeSelectPreview(false);
	const dragStartTime = scale.pxToTime(dragStartPx - TRACK_SHELL_WIDTH);
	const dragEndTime = scale.pxToTime(currentPx - TRACK_SHELL_WIDTH);
	frontendLocalState.selectTimeRange(
	Math.max(
	Math.min(dragStartTime, dragEndTime), traceTime.startSec),
	Math.min(Math.max(dragStartTime, dragEndTime), traceTime.endSec));
	}
	globals.rafScheduler.scheduleRedraw();
	}
	});
	}

	onremove() {
	window.removeEventListener('resize', this.onResize);
	if (this.zoomContent) this.zoomContent.shutdown();
	}

	view() {
	const scrollingPanels: AnyAttrsVnode[] =
	globals.state.scrollingTracks.map(id => m(TrackPanel, {key: id, id}));

	for (const group of Object.values(globals.state.trackGroups)) {
	scrollingPanels.push(m(TrackGroupPanel, {
	trackGroupId: group.id,
	key: `trackgroup-${group.id}`,
	}));
	if (group.collapsed) continue;
	for (const trackId of group.tracks) {
	scrollingPanels.push(m(TrackPanel, {
	key: `track-${group.id}-${trackId}`,
	id: trackId,
	}));
	}
	}
	scrollingPanels.unshift(m(QueryTable, {key: 'query'}));

	const detailsPanels: AnyAttrsVnode[] = [];
	const curSelection = globals.state.currentSelection;
	if (curSelection) {
	switch (curSelection.kind) {
	case 'NOTE':
	detailsPanels.push(m(NotesEditorPanel, {
	key: 'notes',
	id: curSelection.id,
	}));
	break;
	case 'SLICE':
	detailsPanels.push(m(SliceDetailsPanel, {
	key: 'slice',
	}));
	break;
	case 'COUNTER':
	detailsPanels.push(m(CounterDetailsPanel, {
	key: 'counter',
	}));
	break;
	case 'HEAP_PROFILE':
	detailsPanels.push(m(HeapProfileDetailsPanel, {key: 'heap_profile'}));
	break;
	case 'CHROME_SLICE':
	detailsPanels.push(m(ChromeSliceDetailsPanel));
	break;
	case 'THREAD_STATE':
	detailsPanels.push(m(ThreadStatePanel, {
	key: 'thread_state',
	ts: curSelection.ts,
	dur: curSelection.dur,
	utid: curSelection.utid,
	state: curSelection.state,
	cpu: curSelection.cpu
	}));
	break;
	default:
	break;
	}
	} else if (hasLogs()) {
	detailsPanels.push(m(LogPanel, {}));
	}

	const wasShowing = this.showDetailsPanel;
	this.showDetailsPanel = detailsPanels.length > 0;
	// Pop up details panel on first selection.
	if (!wasShowing && this.showDetailsPanel &&
	this.detailsHeight === DRAG_HANDLE_HEIGHT_PX) {
	this.detailsHeight = DEFAULT_DETAILS_HEIGHT_PX;
	}

	return m(
	'.page',
	m('.split-panel',
	m('.pan-and-zoom-content',
	{
	onclick: () => {
	// We don't want to deselect when panning/drag selecting.
	if (this.keepCurrentSelection) {
	this.keepCurrentSelection = false;
	return;
	}
	globals.makeSelection(Actions.deselect({}));
	}
	},
	m('.pinned-panel-container', m(PanelContainer, {
	doesScroll: false,
	panels: [
	m(OverviewTimelinePanel, {key: 'overview'}),
	m(TimeAxisPanel, {key: 'timeaxis'}),
	m(TimeSelectionPanel, {key: 'timeselection'}),
	m(NotesPanel, {key: 'notes'}),
	m(TickmarkPanel, {key: 'searchTickmarks'}),
	...globals.state.pinnedTracks.map(
	id => m(TrackPanel, {key: id, id})),
	],
	kind: 'OVERVIEW',
	})),
	m('.scrolling-panel-container', m(PanelContainer, {
	doesScroll: true,
	panels: scrollingPanels,
	kind: 'TRACKS',
	}))),
	m('.video-panel',
	(globals.state.videoEnabled && globals.state.video != null) ?
	m(VideoPanel) :
	null)),
	m('.details-content',
	{
	style: {
	height: `${this.detailsHeight}px`,
	display: this.showDetailsPanel ? null : 'none'
	}
	},
	m(DragHandle, {
	resize: (height: number) => {
	this.detailsHeight = Math.max(height, DRAG_HANDLE_HEIGHT_PX);
	},
	height: this.detailsHeight,
	}),
	m('.details-panel-container',
	m(PanelContainer,
	{doesScroll: true, panels: detailsPanels, kind: 'DETAILS'}))));
	}
	}

	export const ViewerPage = createPage({
	view() {
	return m(TraceViewer);
	}
	});