Function setElementHoverStyle

libs/echarts/echarts.simple.js:17277–17303

* Set hover style (namely "emphasis style") of element, based on the current * style of the given `el`. * This method should be called after all of the normal styles have been adopted * to the `el`. See the reason on `setHoverStyle`. * * @param {module:zrender/Element} el Should not be `zrender

(el, hoverStl)

 *        Otherwise, use the default hover style if not provided.
 */
function setElementHoverStyle(el, hoverStl) {
    // For performance consideration, it might be better to make the "hover style" only the
    // difference properties from the "normal style", but not a entire copy of all styles.
    hoverStl = el.__hoverStl = hoverStl !== false && (el.hoverStyle || hoverStl || {});
    el.__hoverStlDirty = true;

    // FIXME
    // It is not completely right to save "normal"/"emphasis" flag on elements.
    // It probably should be saved on `data` of series. Consider the cases:
    // (1) A highlighted elements are moved out of the view port and re-enter
    // again by dataZoom.
    // (2) call `setOption` and replace elements totally when they are highlighted.
    if (el.__highlighted) {
        // Consider the case:
        // The styles of a highlighted `el` is being updated. The new "emphasis style"
        // should be adapted to the `el`. Notice here new "normal styles" should have
        // been set outside and the cached "normal style" is out of date.
        el.__cachedNormalStl = null;
        // Do not clear `__cachedNormalZ2` here, because setting `z2` is not a constraint
        // of this method. In most cases, `z2` is not set and hover style should be able
        // to rollback. Of course, that would bring bug, but only in a rare case, see
        // `doSingleLeaveHover` for details.
        singleEnterNormal(el);

        singleEnterEmphasis(el);
    }
}

function onElementMouseOver(e) {
    !shouldSilent(this, e)