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/**
* Elements are drawn in a specific order based on compound depth (low to high), the element type (nodes above edges),
* and z-index (low to high). These styles affect how this applies:
*
* z-compound-depth: May be `bottom | orphan | auto | top`. The first drawn is `bottom`, then `orphan` which is the
* same depth as the root of the compound graph, followed by the default value `auto` which draws in order from
* root to leaves of the compound graph. The last drawn is `top`.
* z-index-compare: May be `auto | manual`. The default value is `auto` which always draws edges under nodes.
* `manual` ignores this convention and draws based on the `z-index` value setting.
* z-index: An integer value that affects the relative draw order of elements. In general, an element with a higher
* `z-index` will be drawn on top of an element with a lower `z-index`.
*/
import * as util from '../util';
let zIndexSort = function( a, b ){
let cy = a.cy();
let hasCompoundNodes = cy.hasCompoundNodes();
function getDepth(ele){
let style = ele.pstyle( 'z-compound-depth' );
if ( style.value === 'auto' ){
return hasCompoundNodes ? ele.zDepth() : 0;
} else if ( style.value === 'bottom' ){
return -1;
} else if ( style.value === 'top' ){
return util.MAX_INT;
}
// 'orphan'
return 0;
}
let depthDiff = getDepth(a) - getDepth(b);
if ( depthDiff !== 0 ){
return depthDiff;
}
function getEleDepth(ele){
let style = ele.pstyle( 'z-index-compare' );
if ( style.value === 'auto' ){
return ele.isNode() ? 1 : 0;
}
// 'manual'
return 0;
}
let eleDiff = getEleDepth(a) - getEleDepth(b);
if ( eleDiff !== 0 ){
return eleDiff;
}
let zDiff = a.pstyle( 'z-index' ).value - b.pstyle( 'z-index' ).value;
if ( zDiff !== 0 ){
return zDiff;
}
// compare indices in the core (order added to graph w/ last on top)
return a.poolIndex() - b.poolIndex();
};
export default zIndexSort;
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