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Copyright (C) 2017 Red Hat, Inc.
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 React, {
FunctionComponent,
createContext,
useContext,
useRef,
} from 'react';
import { DndProvider } from 'react-dnd';
import { HTML5Backend } from 'react-dnd-html5-backend';
import { IDragAndDropField } from './models';
import { TouchBackend } from 'react-dnd-touch-backend';
const probablyTouch =
window.matchMedia &&
(window.matchMedia('(pointer: none)').matches ||
window.matchMedia('(pointer: coarse)').matches) &&
window.matchMedia('(hover: none)').matches;
const TouchAndPointerProvider: FunctionComponent = ({ children }) => {
return (
<DndProvider backend={TouchBackend} options={{ enableMouseEvents: true }}>
{children}
</DndProvider>
);
};
const MouseOnlyProvider: FunctionComponent = ({ children }) => (
<DndProvider backend={HTML5Backend}>{children}</DndProvider>
);
interface IFieldsDndContext {
getHoveredTarget: () => IDragAndDropField | null;
setHoveredTarget: (target: IDragAndDropField | null) => void;
}
const FieldsDndContext = createContext<IFieldsDndContext | null>(null);
export const FieldsDndProvider: FunctionComponent = ({ children }) => {
const hoveredTarget = useRef<IDragAndDropField | null>(null);
const getHoveredTarget = () => hoveredTarget.current;
const setHoveredTarget = (target: IDragAndDropField | null) =>
(hoveredTarget.current = target);
const Provider = probablyTouch ? TouchAndPointerProvider : MouseOnlyProvider;
return (
<Provider>
<FieldsDndContext.Provider value={{ getHoveredTarget, setHoveredTarget }}>
{children}
</FieldsDndContext.Provider>
</Provider>
);
};
export function useFieldsDnd() {
const context = useContext(FieldsDndContext);
Iif (!context) {
throw new Error(
'A FieldsDndProvider wrapper is required to use this hook.',
);
}
return context;
}
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