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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 | 160x | /**
* Patch flags are optimization hints generated by the compiler.
* when a block with dynamicChildren is encountered during diff, the algorithm
* enters "optimized mode". In this mode, we know that the vdom is produced by
* a render function generated by the compiler, so the algorithm only needs to
* handle updates explicitly marked by these patch flags.
*
* Patch flags can be combined using the | bitwise operator and can be checked
* using the & operator, e.g.
*
* ```js
* const flag = TEXT | CLASS
* if (flag & TEXT) { ... }
* ```
*
* Check the `patchElement` function in '../../runtime-core/src/renderer.ts' to see how the
* flags are handled during diff.
*/
export const enum PatchFlags {
/**
* Indicates an element with dynamic textContent (children fast path)
*/
TEXT = 1,
/**
* Indicates an element with dynamic class binding.
*/
CLASS = 1 << 1,
/**
* Indicates an element with dynamic style
* The compiler pre-compiles static string styles into static objects
* + detects and hoists inline static objects
* e.g. `style="color: red"` and `:style="{ color: 'red' }"` both get hoisted
* as:
* ```js
* const style = { color: 'red' }
* render() { return e('div', { style }) }
* ```
*/
STYLE = 1 << 2,
/**
* Indicates an element that has non-class/style dynamic props.
* Can also be on a component that has any dynamic props (includes
* class/style). when this flag is present, the vnode also has a dynamicProps
* array that contains the keys of the props that may change so the runtime
* can diff them faster (without having to worry about removed props)
*/
PROPS = 1 << 3,
/**
* Indicates an element with props with dynamic keys. When keys change, a full
* diff is always needed to remove the old key. This flag is mutually
* exclusive with CLASS, STYLE and PROPS.
*/
FULL_PROPS = 1 << 4,
/**
* Indicates an element with event listeners (which need to be attached
* during hydration)
*/
HYDRATE_EVENTS = 1 << 5,
/**
* Indicates a fragment whose children order doesn't change.
*/
STABLE_FRAGMENT = 1 << 6,
/**
* Indicates a fragment with keyed or partially keyed children
*/
KEYED_FRAGMENT = 1 << 7,
/**
* Indicates a fragment with unkeyed children.
*/
UNKEYED_FRAGMENT = 1 << 8,
/**
* Indicates an element that only needs non-props patching, e.g. ref or
* directives (onVnodeXXX hooks). since every patched vnode checks for refs
* and onVnodeXXX hooks, it simply marks the vnode so that a parent block
* will track it.
*/
NEED_PATCH = 1 << 9,
/**
* Indicates a component with dynamic slots (e.g. slot that references a v-for
* iterated value, or dynamic slot names).
* Components with this flag are always force updated.
*/
DYNAMIC_SLOTS = 1 << 10,
/**
* Indicates a fragment that was created only because the user has placed
* comments at the root level of a template. This is a dev-only flag since
* comments are stripped in production.
*/
DEV_ROOT_FRAGMENT = 1 << 11,
/**
* SPECIAL FLAGS -------------------------------------------------------------
* Special flags are negative integers. They are never matched against using
* bitwise operators (bitwise matching should only happen in branches where
* patchFlag > 0), and are mutually exclusive. When checking for a special
* flag, simply check patchFlag === FLAG.
*/
/**
* Indicates a hoisted static vnode. This is a hint for hydration to skip
* the entire sub tree since static content never needs to be updated.
*/
HOISTED = -1,
/**
* A special flag that indicates that the diffing algorithm should bail out
* of optimized mode. For example, on block fragments created by renderSlot()
* when encountering non-compiler generated slots (i.e. manually written
* render functions, which should always be fully diffed)
* OR manually cloneVNodes
*/
BAIL = -2
}
/**
* dev only flag -> name mapping
*/
export const PatchFlagNames = {
[PatchFlags.TEXT]: `TEXT`,
[PatchFlags.CLASS]: `CLASS`,
[PatchFlags.STYLE]: `STYLE`,
[PatchFlags.PROPS]: `PROPS`,
[PatchFlags.FULL_PROPS]: `FULL_PROPS`,
[PatchFlags.HYDRATE_EVENTS]: `HYDRATE_EVENTS`,
[PatchFlags.STABLE_FRAGMENT]: `STABLE_FRAGMENT`,
[PatchFlags.KEYED_FRAGMENT]: `KEYED_FRAGMENT`,
[PatchFlags.UNKEYED_FRAGMENT]: `UNKEYED_FRAGMENT`,
[PatchFlags.NEED_PATCH]: `NEED_PATCH`,
[PatchFlags.DYNAMIC_SLOTS]: `DYNAMIC_SLOTS`,
[PatchFlags.DEV_ROOT_FRAGMENT]: `DEV_ROOT_FRAGMENT`,
[PatchFlags.HOISTED]: `HOISTED`,
[PatchFlags.BAIL]: `BAIL`
}
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