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react-fit

v1.7.1

Published

Fit a popover element on the screen.

Downloads

919,272

Readme

npm downloads CI

React-Fit

A component that aligns its child relatively to its parent while being aware where it may and may not fit.

tl;dr

  • Install by executing npm install react-fit or yarn add react-fit.
  • Import by adding import Fit from 'react-fit'.
  • Do stuff with it!
    function ElementWithChild() {
      return (
        <Parent>
          <Fit>
            <PopoverChild />
          </Fit>
        </Parent>
      );
    }

Getting started

Compatibility

Your project needs to use React 16.8 or later.

Installation

Add React-Fit to your project by executing npm install react-fit or yarn add react-fit.

How does it work?

  1. By default, the element provided to <Fit /> as a child is displayed below its parent, aligned to the left.
  2. If the element can't fit in this position and collides with bottom and/or right border of the container, <Fit /> checks if there's more space for the element on the other side(s) of the axis/axes the collision(s) has been detected on. If so, the element is moved above its parent and/or aligned to the right, depending on the collision axis.
  3. If the element still can't fit where it's placed, <Fit /> decreases the element's size. If min-width/min-height are provided, they will be respected.

Positioning the element

Vertical axis (default)

By default, the element is displayed below its parent, aligned to the left of its parent.

┌────────────┐
│   Parent   │
├────────────┴────────────┐
│                         │
│         Child           │
│                         │
└─────────────────────────┘
  • To display the element above: provide invertAxis flag.
  • To align the element to the right: provide invertSecondaryAxis flag.

Horizontal axis (mainAxis="x")

By providing mainAxis="x" to <Fit />, the element is displayed on the right of its parent, aligned to the top of its parent.

┌────────────┬─────────────────────────┐
│   Parent   │                         │
└────────────┤         Child           │
             │                         │
             └─────────────────────────┘
  • To display the element on the left: provide invertAxis flag.
  • To align the element to the bottom: provide invertSecondaryAxis flag.

Spacing

By default, React-Fit leaves 8px of space between its child and the borders of the container.

┌──────────────────────────────────────────┐
│ ┌────────────┐                           │
│ │   Parent   │                           │
│ ├────────────┴────────────┐              │
│ │                         │              │
│ │         Child           │              │
│ │                         │              │
│ └─────────────────────────┘              │
└──────────────────────────────────────────┘

If you wish to change this spacing, you can provide spacing to <Fit />. For example, if you wish for the child to touch the borders of the container, decrease the spacing by providing spacing={0} to <Fit />.

┌──────────────────────────────────────────┐
│ ┌────────────┐                           │
│ │   Parent   │                           │
│ ├────────────┴────────────┐              │
│ │                         │              │
│ │         Child           │              │
│ │      (now higher)       │              │
│ │                         │              │
└─┴─────────────────────────┴──────────────┘

You can also provide different spacing for each side by providing an object, for example spacing={{ top: 10, bottom: 20, left: 30, right: 40 }}, to <Fit />. Note: Memoize the object or define it outside render function to avoid unnecessary re-renders.

Styling

To avoid unnecessary style recalculations that may be caused by React-Fit applying the styles needed to make it work properly, the element should have absolute position, and its parent element should have relative or absolute position.

License

The MIT License.

Author