reorganize files

web/static/libs/snabbdom/src/helpers/attachto.ts

@@ -0,0 +1,64 @@
+import {VNode, VNodeData} from '../vnode';
+
+export interface AttachData {
+  [key: string]: any
+  [i: number]: any
+  placeholder?: any
+  real?: Node
+}
+
+interface VNodeDataWithAttach extends VNodeData {
+  attachData: AttachData
+}
+
+interface VNodeWithAttachData extends VNode {
+  data: VNodeDataWithAttach
+}
+
+function pre(vnode: VNodeWithAttachData, newVnode: VNodeWithAttachData): void {
+  const attachData = vnode.data.attachData;
+  // Copy created placeholder and real element from old vnode
+  newVnode.data.attachData.placeholder = attachData.placeholder;
+  newVnode.data.attachData.real = attachData.real;
+  // Mount real element in vnode so the patch process operates on it
+  vnode.elm = vnode.data.attachData.real;
+}
+
+function post(_: any, vnode: VNodeWithAttachData): void {
+  // Mount dummy placeholder in vnode so potential reorders use it
+  vnode.elm = vnode.data.attachData.placeholder;
+}
+
+function destroy(vnode: VNodeWithAttachData): void {
+  // Remove placeholder
+  if (vnode.elm !== undefined) {
+    (vnode.elm.parentNode as HTMLElement).removeChild(vnode.elm);
+  }
+  // Remove real element from where it was inserted
+  vnode.elm = vnode.data.attachData.real;
+}
+
+function create(_: any, vnode: VNodeWithAttachData): void {
+  const real = vnode.elm, attachData = vnode.data.attachData;
+  const placeholder = document.createElement('span');
+  // Replace actual element with dummy placeholder
+  // Snabbdom will then insert placeholder instead
+  vnode.elm = placeholder;
+  attachData.target.appendChild(real);
+  attachData.real = real;
+  attachData.placeholder = placeholder;
+}
+
+export function attachTo(target: Element, vnode: VNode): VNode {
+  if (vnode.data === undefined) vnode.data = {};
+  if (vnode.data.hook === undefined) vnode.data.hook = {};
+  const data = vnode.data;
+  const hook = vnode.data.hook;
+  data.attachData = {target: target, placeholder: undefined, real: undefined};
+  hook.create = create;
+  hook.prepatch = pre;
+  hook.postpatch = post;
+  hook.destroy = destroy;
+  return vnode;
+};
+export default attachTo;