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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 | 2x 2x 2x 2x 2x | import areEquivalentValues from "./areEquivalentValues";
import { createNode } from "./createNode";
import { mountNode } from "./mount";
import { NodePatchingData } from "./NodePatcher"
export function updateChildren(container: Node, oldPatchingData: NodePatchingData[], newPatchingData: NodePatchingData[]) {
let { length: oldCount } = oldPatchingData;
// Map the keyed nodes from the old children nodes
const keyedNodes = new Map<any, Node>();
for (let i = 0; i < oldCount; ++i) {
const {
node: oldChild
} = oldPatchingData[i];
if (oldChild === undefined) { // Not a patching data
continue;
}
let key = (oldChild as HTMLElement).getAttribute?.('key') || null;
if (key !== null) {
keyedNodes.set(key, oldChild);
}
}
const { length: newCount } = newPatchingData;
for (let i = 0; i < newCount; ++i) {
const oldChild = i < oldPatchingData.length ?
oldPatchingData[i].node :
undefined;
if (oldChild === undefined) { // Mount the child
mountNode(container, newPatchingData[i]);
}
else { // oldChild !== undefined
const newChildPatchingData = newPatchingData[i];
const {
patcher,
values
} = newChildPatchingData;
// Check for any keyed patching data
const {
keyIndex
} = patcher;
const valueKey = keyIndex !== undefined ? values[keyIndex].toString() : null;
// Compare against a keyed node
const oldChildKey = (oldChild as HTMLElement).getAttribute?.('key') || null;
if (oldChildKey === valueKey) { // If the keys are the same patch the node with that patching data
updateNode(oldChild, oldPatchingData[i], newChildPatchingData);
}
else { // oldChildKey !== valueKey - Find the node that corresponds with the keyed patching data
if (keyedNodes.has(valueKey)) { // Find an existing keyed node
const keyedNode = keyedNodes.get(valueKey);
// If the values of the keyed node match the ones of the oldChild then just swap them
if (areEquivalentValues(newChildPatchingData.values, (keyedNode as any)._$patchingData.values)) {
if (i >= container.childNodes.length) {
container.appendChild(keyedNode);
}
else {
container.insertBefore(keyedNode, container.childNodes[i]); // Notice oldNode is not being used since its position might have changed
}
newChildPatchingData.node = keyedNode; // Set the node of the new patching data
}
else { // Some value has changed, patch the existing node
updateNode(oldChild, oldPatchingData[i], (keyedNode as any)._$patchingData);
}
}
else { // No keyed node found, set the new child
updateNode(oldChild, oldPatchingData[i], newChildPatchingData);
}
}
}
}
// Remove the extra nodes
for (let i = oldCount - 1; i >= newCount; --i) {
(oldPatchingData[i].node as HTMLElement).remove();
}
}
export function updateNode(container: Node, oldPatchingData: NodePatchingData, newPatchingData: NodePatchingData) {
let {
node
} = oldPatchingData;
if (node === undefined) {
throw new Error('There must be an existing node');
}
const {
patcher: oldPatcher,
values: oldValues,
rules
} = oldPatchingData;
const {
patcher,
values
} = newPatchingData;
if (oldPatcher === patcher) {
newPatchingData.rules = rules; // Set the compiled rules in the new patched data
newPatchingData.node = node; // Set the node in the new patching data
if (areEquivalentValues(oldPatchingData.values, newPatchingData.values)) {
return; // Same patcher and same vales mean no changes to apply
}
oldPatcher.patchNode(node, rules, oldValues, values);
(node as any)._$patchingData = newPatchingData;
}
else { // Different type of node, replace it with a new one
const newNode = createNode(container, newPatchingData);
container.replaceChild(newNode, node);
}
} |