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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 { Coords, RectWithId, Rects } from './models';
import { FunctionComponent, createContext, useContext } from 'react';
import React, {
ReactElement,
useCallback,
useEffect,
useMemo,
useRef,
useState,
} from 'react';
import { scaleLinear } from 'd3-scale';
import { useGesture } from 'react-use-gesture';
type RedrawCallback = () => unknown;
type RedrawCallbacks = Array<RedrawCallback>;
export interface ICanvasDimension {
width: number;
height: number;
offsetTop: number;
offsetLeft: number;
}
export interface ICanvasContext {
initialWidth?: number;
initialHeight?: number;
dimensions: ICanvasDimension;
setDimension: (dimension: ICanvasDimension) => void;
panX: number;
panY: number;
addRedrawListener: (callback: RedrawCallback) => void;
removeRedrawListener: (callback: RedrawCallback) => void;
addRect: (rect: RectWithId) => void;
removeRect: (id: string) => void;
getRects: () => Rects;
zoom: number;
updateZoom: (tick: number) => void;
resetZoom: () => void;
pan: Coords;
setPan: (pan: Coords) => void;
resetPan: () => void;
allowPanning: boolean;
isPanning: boolean;
bindCanvas: ReturnType<typeof useGesture>;
}
const CanvasContext = createContext<ICanvasContext | null>(null);
export interface ICanvasProviderProps {
allowPanning?: boolean;
initialWidth?: number;
initialHeight?: number;
initialZoom?: number;
initialPanX?: number;
initialPanY?: number;
}
export const CanvasProvider: FunctionComponent<ICanvasProviderProps> = ({
children,
allowPanning = false,
initialWidth = 0,
initialHeight = 0,
initialZoom = 1,
initialPanX = 0,
initialPanY = 0,
}) => {
const [canvasDimension, setCanvasDimension] = useState<ICanvasDimension>({
width: 0,
height: 0,
offsetLeft: 0,
offsetTop: 0,
});
const rects = useRef<Rects>([]);
const removeRect = useCallback((id: string) => {
rects.current = rects.current.filter((r) => r.id !== id);
}, []);
const addRect = useCallback(
(rect: RectWithId) => {
removeRect(rect.id);
rects.current = [...rects.current, rect];
},
[removeRect],
);
const getRects = useCallback(() => rects.current, []);
const redrawCallbacks = useRef<RedrawCallbacks>([]);
const addRedrawListener = useCallback((cb: RedrawCallback) => {
redrawCallbacks.current = [...redrawCallbacks.current, cb];
}, []);
const removeRedrawListener = useCallback((cb: RedrawCallback) => {
redrawCallbacks.current = redrawCallbacks.current.filter((c) => c !== cb);
}, []);
useEffect(function effectLoop() {
let frame = requestAnimationFrame(function loop() {
frame = requestAnimationFrame(loop);
for (let i = 0, len = redrawCallbacks.current.length; i < len; i++) {
redrawCallbacks.current[i]();
}
});
return function cancelEffectLoop() {
cancelAnimationFrame(frame);
};
}, []);
const [{ x: panX, y: panY }, setPan] = useState<Coords>({
x: initialPanX,
y: initialPanY,
});
const [zoom, setZoom] = useState(initialZoom);
const updateZoom = useCallback(
(tick: number) => {
setZoom((currentZoom) => Math.max(0.2, Math.min(2, currentZoom + tick)));
},
[setZoom],
);
const resetZoom = useCallback(() => setZoom(1), [setZoom]);
const resetPan = useCallback(() => setPan({ x: 0, y: 0 }), [setPan]);
const [isPanning, setIsPanning] = useState(false);
const bindCanvas = useGesture(
{
onDrag: ({ movement: [x, y], first, last, memo = [panX, panY] }) => {
if (first) setIsPanning(true);
if (last) setIsPanning(false);
setPan({ x: x + memo[0], y: y + memo[1] });
return memo;
},
onWheel: ({ delta }) => {
updateZoom(delta[1] * -0.001);
},
},
{
drag: {
delay: true,
},
enabled: allowPanning,
},
);
return (
<CanvasContext.Provider
value={{
initialWidth,
initialHeight,
dimensions: canvasDimension,
setDimension: setCanvasDimension,
panX,
panY,
addRedrawListener,
removeRedrawListener,
addRect,
removeRect,
getRects,
zoom,
updateZoom,
resetZoom,
pan: { x: panX, y: panY },
setPan,
resetPan,
allowPanning,
isPanning,
bindCanvas,
}}
>
{children}
</CanvasContext.Provider>
);
};
export function useCanvas() {
const context = useContext(CanvasContext);
Iif (!context) {
throw new Error('A CanvasProvider wrapper is required to use this hook.');
}
const {
dimensions: { width, height },
zoom,
} = context;
const xDomain = useMemo(
() =>
scaleLinear()
.range([0, width])
.domain([0, width * zoom]),
[width, zoom],
);
const yDomain = useMemo(
() =>
scaleLinear()
.range([height, 0])
.domain([height * zoom, 0]),
[height, zoom],
);
return {
...context,
xDomain,
yDomain,
};
}
export interface IWithCanvasProps {
children: (props: ICanvasContext) => ReactElement;
}
export const WithCanvas: FunctionComponent<IWithCanvasProps> = ({
children,
}) => {
const context = useCanvas();
return children(context);
};
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