/
SchedulingProfilerContext.js
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/
SchedulingProfilerContext.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import * as React from 'react';
import {createContext, useCallback, useMemo, useState} from 'react';
import createDataResourceFromImportedFile from './createDataResourceFromImportedFile';
import type {HorizontalScrollStateChangeCallback, ViewState} from './types';
import type {DataResource} from './createDataResourceFromImportedFile';
export type Context = {|
clearSchedulingProfilerData: () => void,
importSchedulingProfilerData: (file: File) => void,
schedulingProfilerData: DataResource | null,
viewState: ViewState,
|};
const SchedulingProfilerContext = createContext<Context>(
((null: any): Context),
);
SchedulingProfilerContext.displayName = 'SchedulingProfilerContext';
type Props = {|
children: React$Node,
|};
function SchedulingProfilerContextController({children}: Props) {
const [
schedulingProfilerData,
setSchedulingProfilerData,
] = useState<DataResource | null>(null);
const clearSchedulingProfilerData = useCallback(() => {
setSchedulingProfilerData(null);
}, []);
const importSchedulingProfilerData = useCallback((file: File) => {
setSchedulingProfilerData(createDataResourceFromImportedFile(file));
}, []);
// Recreate view state any time new profiling data is imported.
const viewState = useMemo<ViewState>(() => {
const horizontalScrollStateChangeCallbacks: Set<HorizontalScrollStateChangeCallback> = new Set();
const horizontalScrollState = {
offset: 0,
length: 0,
};
return {
horizontalScrollState,
onHorizontalScrollStateChange: callback => {
horizontalScrollStateChangeCallbacks.add(callback);
},
updateHorizontalScrollState: scrollState => {
if (
horizontalScrollState.offset === scrollState.offset &&
horizontalScrollState.length === scrollState.length
) {
return;
}
horizontalScrollState.offset = scrollState.offset;
horizontalScrollState.length = scrollState.length;
horizontalScrollStateChangeCallbacks.forEach(callback => {
callback(scrollState);
});
},
viewToMutableViewStateMap: new Map(),
};
}, [schedulingProfilerData]);
const value = useMemo(
() => ({
clearSchedulingProfilerData,
importSchedulingProfilerData,
schedulingProfilerData,
viewState,
}),
[
clearSchedulingProfilerData,
importSchedulingProfilerData,
schedulingProfilerData,
viewState,
],
);
return (
<SchedulingProfilerContext.Provider value={value}>
{children}
</SchedulingProfilerContext.Provider>
);
}
export {SchedulingProfilerContext, SchedulingProfilerContextController};