@angular/flex-layout
Version:
Angular Flex-Layout =======
83 lines • 8.64 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
export const INLINE = 'inline';
export const LAYOUT_VALUES = ['row', 'column', 'row-reverse', 'column-reverse'];
/**
* Validate the direction|'direction wrap' value and then update the host's inline flexbox styles
*/
export function buildLayoutCSS(value) {
let [direction, wrap, isInline] = validateValue(value);
return buildCSS(direction, wrap, isInline);
}
/**
* Validate the value to be one of the acceptable value options
* Use default fallback of 'row'
*/
export function validateValue(value) {
value = value?.toLowerCase() ?? '';
let [direction, wrap, inline] = value.split(' ');
// First value must be the `flex-direction`
if (!LAYOUT_VALUES.find(x => x === direction)) {
direction = LAYOUT_VALUES[0];
}
if (wrap === INLINE) {
wrap = (inline !== INLINE) ? inline : '';
inline = INLINE;
}
return [direction, validateWrapValue(wrap), !!inline];
}
/**
* Determine if the validated, flex-direction value specifies
* a horizontal/row flow.
*/
export function isFlowHorizontal(value) {
let [flow,] = validateValue(value);
return flow.indexOf('row') > -1;
}
/**
* Convert layout-wrap='<value>' to expected flex-wrap style
*/
export function validateWrapValue(value) {
if (!!value) {
switch (value.toLowerCase()) {
case 'reverse':
case 'wrap-reverse':
case 'reverse-wrap':
value = 'wrap-reverse';
break;
case 'no':
case 'none':
case 'nowrap':
value = 'nowrap';
break;
// All other values fallback to 'wrap'
default:
value = 'wrap';
break;
}
}
return value;
}
/**
* Build the CSS that should be assigned to the element instance
* BUG:
* 1) min-height on a column flex container won’t apply to its flex item children in IE 10-11.
* Use height instead if possible; height : <xxx>vh;
*
* This way any padding or border specified on the child elements are
* laid out and drawn inside that element's specified width and height.
*/
function buildCSS(direction, wrap = null, inline = false) {
return {
display: inline ? 'inline-flex' : 'flex',
'box-sizing': 'border-box',
'flex-direction': direction,
'flex-wrap': wrap || null,
};
}
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