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index.jsx
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index.jsx
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import React, { DOM, PropTypes, Component, createFactory } from 'react';
const assign = require('object-assign'),
ALLOWED_UNITS = PropTypes.oneOf([ 'in', 'px', 'cm', 'mm' ]),
INCHES_TO_CENTIMETERS = 2.54;
class ReactPageDiv extends Component {
constructor(props, context) {
super(props, context);
this.state = {
increments: 1,
calculateTimer: null
};
}
/**
* When mounting, start off the timer for checking the height
*/
componentDidMount() {
this.checkHeight();
}
/**
* Whenever updated, we need to recalculate our height immediately
* @param prevProps
* @param prevState
*/
componentDidUpdate(prevProps, prevState) {
this.calculateHeight();
// we weren't running the check timer so kick it back off
if (prevProps.calculateTimer === null) {
this.checkHeight();
}
}
/**
* This function checks height on an interval
*/
checkHeight() {
this.calculateHeight();
const { checkInterval } = this.props;
if (checkInterval !== null) {
const calculateTimer = setTimeout(() => this.checkHeight(), checkInterval);
this.setState({ calculateTimer });
}
}
calculateHeight() {
const { hidden } = this.refs,
{ heightUnit, dpi, height } = this.props,
{ increments } = this.state,
{ scrollHeight } = hidden;
if (typeof scrollHeight === 'undefined') {
return;
}
// calculate the height of the page in pixels based on the dpi
let heightUnitHeight;
if (heightUnit === 'in') {
heightUnitHeight = (scrollHeight / dpi);
} else if (heightUnit === 'px') {
heightUnitHeight = scrollHeight;
} else if (heightUnit === 'cm') {
heightUnitHeight = (scrollHeight / dpi) * INCHES_TO_CENTIMETERS;
} else if (heightUnit === 'mm') {
heightUnitHeight = (scrollHeight / dpi) * INCHES_TO_CENTIMETERS * 10;
}
// calculate the number of increments of one page that we should extend
const newIncrements = Math.ceil(heightUnitHeight / height);
if (increments !== newIncrements) {
this.setState({ increments: newIncrements });
}
}
getPageMarkers() {
const { increments } = this.state,
{ pageMarkerClassName, pageMarkerStyle, height, heightUnit } = this.props,
pageMarkers = [];
for (let i = 1; i < increments; i++) {
const markerStyle = assign({}, pageMarkerStyle, {
position: 'absolute',
left: 0,
right: 0,
top: (i * height) + heightUnit
});
pageMarkers.push(<div key={i} className={pageMarkerClassName} style={markerStyle}/>);
}
return pageMarkers;
}
getWidth() {
const { width, widthUnit } = this.props;
return (width + widthUnit);
}
getHiddenDiv() {
const { style, className, children } = this.props;
const divStyle = assign({}, style, {
position: 'absolute',
width: this.getWidth(),
height: 0,
visibility: 'hidden'
});
return <div key="hidden" ref="hidden" className={className} style={divStyle}>{children}</div>;
}
getVisibleDiv() {
const { height, className, style, heightUnit, children } = this.props,
{ increments } = this.state;
const divStyle = assign({}, style, {
overflow: 'hidden',
position: 'relative',
height: (height * increments) + heightUnit,
width: this.getWidth()
});
return (
<div key="visible" ref="visible" className={className} style={divStyle}>
{this.getPageMarkers()}
{children}
</div>
);
}
render() {
return (
<div>
{this.getHiddenDiv()}
{this.getVisibleDiv()}
</div>
);
}
}
ReactPageDiv.propTypes = {
// the width of one page
width: PropTypes.number.isRequired,
widthUnit: ALLOWED_UNITS,
// the height of one page
height: PropTypes.number.isRequired,
heightUnit: ALLOWED_UNITS,
// the dpi of the user agent, used to convert inches to pixels
dpi: PropTypes.number.isRequired,
// how often to verify the proper number of page increments are displayed in ms, or null if all dom updates are happening
// through the div and no timer needs to be set
checkInterval: PropTypes.number,
// the style to apply to the page break marker
pageMarkerStyle: PropTypes.object,
pageMarkerClassName: PropTypes.string
};
ReactPageDiv.defaultProps = {
widthUnit: 'in',
heightUnit: 'in',
dpi: 96,
checkInterval: null,
pageMarkerStyle: {
borderTop: '2px dashed rgba(0,0,0,0.5)'
},
pageMarkerClassName: null
};
export default ReactPageDiv;
const ReactPageDivFactory = createFactory(ReactPageDiv);
export { ReactPageDivFactory };