react-dnd-touch-backend/dist/utils/predicates.js

Touch backend for react-dnd

// Used for MouseEvent.buttons (note the s on the end).
const MouseButtons = {
    Left: 1,
    Right: 2,
    Center: 4
};
// Used for e.button (note the lack of an s on the end).
const MouseButton = {
    Left: 0,
    Center: 1,
    Right: 2
};
/**
 * Only touch events and mouse events where the left button is pressed should initiate a drag.
 * @param {MouseEvent | TouchEvent} e The event
 */ export function eventShouldStartDrag(e) {
    // For touch events, button will be undefined. If e.button is defined,
    // then it should be MouseButton.Left.
    return e.button === undefined || e.button === MouseButton.Left;
}
/**
 * Only touch events and mouse events where the left mouse button is no longer held should end a drag.
 * It's possible the user mouse downs with the left mouse button, then mouse down and ups with the right mouse button.
 * We don't want releasing the right mouse button to end the drag.
 * @param {MouseEvent | TouchEvent} e The event
 */ export function eventShouldEndDrag(e) {
    // Touch events will have buttons be undefined, while mouse events will have e.buttons's left button
    // bit field unset if the left mouse button has been released
    return e.buttons === undefined || (e.buttons & MouseButtons.Left) === 0;
}
export function isTouchEvent(e) {
    return !!e.targetTouches;
}

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