Function patchElement

web/main.js:4914–4993

(n1, n2, parentComponent, parentSuspense, namespace, slotScopeIds, optimized)

    }
  };
  const patchElement = (n1, n2, parentComponent, parentSuspense, namespace, slotScopeIds, optimized) => {
    const el = n2.el = n1.el;
    let { patchFlag, dynamicChildren, dirs } = n2;
    patchFlag |= n1.patchFlag & 16;
    const oldProps = n1.props || EMPTY_OBJ;
    const newProps = n2.props || EMPTY_OBJ;
    let vnodeHook;
    parentComponent && toggleRecurse(parentComponent, false);
    if (vnodeHook = newProps.onVnodeBeforeUpdate) {
      invokeVNodeHook(vnodeHook, parentComponent, n2, n1);
    }
    if (dirs) {
      invokeDirectiveHook(n2, n1, parentComponent, "beforeUpdate");
    }
    parentComponent && toggleRecurse(parentComponent, true);
    if (oldProps.innerHTML && newProps.innerHTML == null || oldProps.textContent && newProps.textContent == null) {
      hostSetElementText(el, "");
    }
    if (dynamicChildren) {
      patchBlockChildren(
        n1.dynamicChildren,
        dynamicChildren,
        el,
        parentComponent,
        parentSuspense,
        resolveChildrenNamespace(n2, namespace),
        slotScopeIds
      );
    } else if (!optimized) {
      patchChildren(
        n1,
        n2,
        el,
        null,
        parentComponent,
        parentSuspense,
        resolveChildrenNamespace(n2, namespace),
        slotScopeIds,
        false
      );
    }
    if (patchFlag > 0) {
      if (patchFlag & 16) {
        patchProps(el, oldProps, newProps, parentComponent, namespace);
      } else {
        if (patchFlag & 2) {
          if (oldProps.class !== newProps.class) {
            hostPatchProp(el, "class", null, newProps.class, namespace);
          }
        }
        if (patchFlag & 4) {
          hostPatchProp(el, "style", oldProps.style, newProps.style, namespace);
        }
        if (patchFlag & 8) {
          const propsToUpdate = n2.dynamicProps;
          for (let i = 0; i < propsToUpdate.length; i++) {
            const key = propsToUpdate[i];
            const prev = oldProps[key];