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…navigate-zoom Keyboard shortcuts and minimap UX
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| // @flow | ||
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| // Copyright (c) 2017 Uber Technologies, Inc. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
|
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| import type { Span, Trace } from '../../types'; | ||
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| /** | ||
| * `Accessors` is necessary because `ScrollManager` needs to be created by | ||
| * `TracePage` so it can be passed into the keyboard shortcut manager. But, | ||
| * `ScrollManager` needs to know about the state of `ListView` and `Positions`, | ||
| * which are very low-level. And, storing their state info in redux or | ||
| * `TracePage#state` would be inefficient because the state info only rarely | ||
| * needs to be accessed (when a keyboard shortcut is triggered). `Accessors` | ||
| * allows that state info to be accessed in a loosely coupled fashion on an | ||
| * as-needed basis. | ||
| */ | ||
| export type Accessors = { | ||
| getViewRange: () => [number, number], | ||
| getSearchedSpanIDs: () => ?Set<string>, | ||
| getCollapsedChildren: () => ?Set<string>, | ||
| getViewHeight: () => number, | ||
| getBottomRowIndexVisible: () => number, | ||
| getTopRowIndexVisible: () => number, | ||
| getRowPosition: number => { height: number, y: number }, | ||
| mapRowIndexToSpanIndex: number => number, | ||
| mapSpanIndexToRowIndex: number => number, | ||
| }; | ||
|
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| interface Scroller { | ||
| scrollTo: number => void, | ||
| scrollBy: (number, ?boolean) => void, | ||
| } | ||
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| /** | ||
| * Returns `{ isHidden: true, ... }` if one of the parents of `span` is | ||
| * collapsed, e.g. has children hidden. | ||
| * | ||
| * @param {Span} span The Span to check for. | ||
| * @param {Set<string>} childrenAreHidden The set of Spans known to have hidden | ||
| * children, either because it is | ||
| * collapsed or has a collapsed parent. | ||
| * @param {Map<string, ?Span} spansMap Mapping from spanID to Span. | ||
| * @returns {{ isHidden: boolean, parentIds: Set<string> }} | ||
| */ | ||
| function isSpanHidden(span: Span, childrenAreHidden: Set<string>, spansMap: Map<string, ?Span>) { | ||
| const parentIDs = new Set(); | ||
| let { references } = span; | ||
| let parentID: ?string; | ||
| const checkRef = ref => { | ||
| if (ref.refType === 'CHILD_OF') { | ||
| parentID = ref.spanID; | ||
| parentIDs.add(parentID); | ||
| return childrenAreHidden.has(parentID); | ||
| } | ||
| return false; | ||
| }; | ||
| while (Array.isArray(references) && references.length) { | ||
| const isHidden = references.some(checkRef); | ||
| if (isHidden) { | ||
| return { isHidden, parentIDs }; | ||
| } | ||
| if (!parentID) { | ||
| break; | ||
| } | ||
| const parent = spansMap.get(parentID); | ||
| parentID = undefined; | ||
| references = parent && parent.references; | ||
| } | ||
| return { parentIDs, isHidden: false }; | ||
| } | ||
|
|
||
| /** | ||
| * ScrollManager is intended for scrolling the TracePage. Has two modes, paging | ||
| * and scrolling to the previous or next visible span. | ||
| */ | ||
| export default class ScrollManager { | ||
| _trace: ?Trace; | ||
| _scroller: Scroller; | ||
| _accessors: ?Accessors; | ||
|
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| constructor(trace: ?Trace, scroller: Scroller) { | ||
| this._trace = trace; | ||
| this._scroller = scroller; | ||
| this._accessors = undefined; | ||
| } | ||
|
|
||
| _scrollPast(rowIndex: number, direction: 1 | -1) { | ||
| const xrs = this._accessors; | ||
| if (!xrs) { | ||
| throw new Error('Accessors not set'); | ||
| } | ||
| const isUp = direction < 0; | ||
| const position = xrs.getRowPosition(rowIndex); | ||
| if (!position) { | ||
| console.warn('Invalid row index'); | ||
| return; | ||
| } | ||
| let { y } = position; | ||
| const vh = xrs.getViewHeight(); | ||
| if (!isUp) { | ||
| y += position.height; | ||
| // scrollTop is based on the top of the window | ||
| y -= vh; | ||
| } | ||
| y += direction * 0.5 * vh; | ||
| this._scroller.scrollTo(y); | ||
| } | ||
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| _scrollToVisibleSpan(direction: 1 | -1) { | ||
| const xrs = this._accessors; | ||
| if (!xrs) { | ||
| throw new Error('Accessors not set'); | ||
| } | ||
| if (!this._trace) { | ||
| return; | ||
| } | ||
| const { duration, spans, startTime: traceStartTime } = this._trace; | ||
| const isUp = direction < 0; | ||
| const boundaryRow = isUp ? xrs.getTopRowIndexVisible() : xrs.getBottomRowIndexVisible(); | ||
| const spanIndex = xrs.mapRowIndexToSpanIndex(boundaryRow); | ||
| if ((spanIndex === 0 && isUp) || (spanIndex === spans.length - 1 && !isUp)) { | ||
| return; | ||
| } | ||
| // fullViewSpanIndex is one row inside the view window unless already at the top or bottom | ||
| let fullViewSpanIndex = spanIndex; | ||
| if (spanIndex !== 0 && spanIndex !== spans.length - 1) { | ||
| fullViewSpanIndex -= direction; | ||
| } | ||
| const [viewStart, viewEnd] = xrs.getViewRange(); | ||
| const checkVisibility = viewStart !== 0 || viewEnd !== 1; | ||
| // use NaN as fallback to make flow happy | ||
| const startTime = checkVisibility ? traceStartTime + duration * viewStart : NaN; | ||
| const endTime = checkVisibility ? traceStartTime + duration * viewEnd : NaN; | ||
| const findMatches = xrs.getSearchedSpanIDs(); | ||
| const _collapsed = xrs.getCollapsedChildren(); | ||
| const childrenAreHidden = _collapsed ? new Set(_collapsed) : null; | ||
| // use empty Map as fallback to make flow happy | ||
| const spansMap = childrenAreHidden ? new Map(spans.map(s => [s.spanID, s])) : new Map(); | ||
| const boundary = direction < 0 ? -1 : spans.length; | ||
| let nextSpanIndex: number; | ||
| for (let i = fullViewSpanIndex + direction; i !== boundary; i += direction) { | ||
| const span = spans[i]; | ||
| const { duration: spanDuration, spanID, startTime: spanStartTime } = span; | ||
| const spanEndTime = spanStartTime + spanDuration; | ||
| if (checkVisibility && (spanStartTime > endTime || spanEndTime < startTime)) { | ||
| // span is not visible within the view range | ||
| continue; | ||
| } | ||
| if (findMatches && !findMatches.has(spanID)) { | ||
| // skip to search matches (when searching) | ||
| continue; | ||
| } | ||
| if (childrenAreHidden) { | ||
| // make sure the span is not collapsed | ||
| const { isHidden, parentIDs } = isSpanHidden(span, childrenAreHidden, spansMap); | ||
| if (isHidden) { | ||
| childrenAreHidden.add(...parentIDs); | ||
| continue; | ||
| } | ||
| } | ||
| nextSpanIndex = i; | ||
| break; | ||
| } | ||
| if (!nextSpanIndex || nextSpanIndex === boundary) { | ||
| // might as well scroll to the top or bottom | ||
| nextSpanIndex = boundary - direction; | ||
| } | ||
| const nextRow = xrs.mapSpanIndexToRowIndex(nextSpanIndex); | ||
| this._scrollPast(nextRow, direction); | ||
| } | ||
|
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||
| /** | ||
| * Sometimes the ScrollManager is created before the trace is loaded. This | ||
| * setter allows the trace to be set asynchronously. | ||
| */ | ||
| setTrace(trace: ?Trace) { | ||
| this._trace = trace; | ||
| } | ||
|
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||
| /** | ||
| * `setAccessors` is bound in the ctor, so it can be passed as a prop to | ||
| * children components. | ||
| */ | ||
| setAccessors = (accessors: Accessors) => { | ||
| this._accessors = accessors; | ||
| }; | ||
|
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||
| /** | ||
| * Scrolls around one page down (0.95x). It is bounds in the ctor, so it can | ||
| * be used as a keyboard shortcut handler. | ||
| */ | ||
| scrollPageDown = () => { | ||
| if (!this._scroller || !this._accessors) { | ||
| return; | ||
| } | ||
| this._scroller.scrollBy(0.95 * this._accessors.getViewHeight(), true); | ||
| }; | ||
|
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| /** | ||
| * Scrolls around one page up (0.95x). It is bounds in the ctor, so it can | ||
| * be used as a keyboard shortcut handler. | ||
| */ | ||
| scrollPageUp = () => { | ||
| if (!this._scroller || !this._accessors) { | ||
| return; | ||
| } | ||
| this._scroller.scrollBy(-0.95 * this._accessors.getViewHeight(), true); | ||
| }; | ||
|
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| /** | ||
| * Scrolls to the next visible span, ignoring spans that do not match the | ||
| * text filter, if there is one. It is bounds in the ctor, so it can | ||
| * be used as a keyboard shortcut handler. | ||
| */ | ||
| scrollToNextVisibleSpan = () => { | ||
| this._scrollToVisibleSpan(1); | ||
| }; | ||
|
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| /** | ||
| * Scrolls to the previous visible span, ignoring spans that do not match the | ||
| * text filter, if there is one. It is bounds in the ctor, so it can | ||
| * be used as a keyboard shortcut handler. | ||
| */ | ||
| scrollToPrevVisibleSpan = () => { | ||
| this._scrollToVisibleSpan(-1); | ||
| }; | ||
|
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||
| destroy() { | ||
| this._trace = undefined; | ||
| this._scroller = (undefined: any); | ||
| this._accessors = undefined; | ||
| } | ||
| } |
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