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Introduce a composer reducer and move image state there (#5547)
* Add composer reducer * Support adding images Co-authored-by: Mary <[email protected]> * Support updating and deleting images Co-authored-by: Mary <[email protected]> * Derive images state from composer state Co-authored-by: Mary <[email protected]> --------- Co-authored-by: Mary <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| import {ComposerImage, createInitialImages} from '#/state/gallery' | ||
| import {ComposerOpts} from '#/state/shell/composer' | ||
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| type PostRecord = { | ||
| uri: string | ||
| } | ||
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| type ImagesMedia = { | ||
| type: 'images' | ||
| images: ComposerImage[] | ||
| labels: string[] | ||
| } | ||
|
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| type ComposerEmbed = { | ||
| // TODO: Other record types. | ||
| record: PostRecord | undefined | ||
| // TODO: Other media types. | ||
| media: ImagesMedia | undefined | ||
| } | ||
|
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| export type ComposerState = { | ||
| // TODO: Other draft data. | ||
| embed: ComposerEmbed | ||
| } | ||
|
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| export type ComposerAction = | ||
| | {type: 'embed_add_images'; images: ComposerImage[]} | ||
| | {type: 'embed_update_image'; image: ComposerImage} | ||
| | {type: 'embed_remove_image'; image: ComposerImage} | ||
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| const MAX_IMAGES = 4 | ||
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| export function composerReducer( | ||
| state: ComposerState, | ||
| action: ComposerAction, | ||
| ): ComposerState { | ||
| switch (action.type) { | ||
| case 'embed_add_images': { | ||
| const prevMedia = state.embed.media | ||
| let nextMedia = prevMedia | ||
| if (!prevMedia) { | ||
| nextMedia = { | ||
| type: 'images', | ||
| images: action.images.slice(0, MAX_IMAGES), | ||
| labels: [], | ||
| } | ||
| } else if (prevMedia.type === 'images') { | ||
| nextMedia = { | ||
| ...prevMedia, | ||
| images: [...prevMedia.images, ...action.images].slice(0, MAX_IMAGES), | ||
| } | ||
| } | ||
| return { | ||
| ...state, | ||
| embed: { | ||
| ...state.embed, | ||
| media: nextMedia, | ||
| }, | ||
| } | ||
| } | ||
| case 'embed_update_image': { | ||
| const prevMedia = state.embed.media | ||
| if (prevMedia?.type === 'images') { | ||
| const updatedImage = action.image | ||
| const nextMedia = { | ||
| ...prevMedia, | ||
| images: prevMedia.images.map(img => { | ||
| if (img.source.id === updatedImage.source.id) { | ||
| return updatedImage | ||
| } | ||
| return img | ||
| }), | ||
| } | ||
| return { | ||
| ...state, | ||
| embed: { | ||
| ...state.embed, | ||
| media: nextMedia, | ||
| }, | ||
| } | ||
| } | ||
| return state | ||
| } | ||
| case 'embed_remove_image': { | ||
| const prevMedia = state.embed.media | ||
| if (prevMedia?.type === 'images') { | ||
| const removedImage = action.image | ||
| let nextMedia: ImagesMedia | undefined = { | ||
| ...prevMedia, | ||
| images: prevMedia.images.filter(img => { | ||
| return img.source.id !== removedImage.source.id | ||
| }), | ||
| } | ||
| if (nextMedia.images.length === 0) { | ||
| nextMedia = undefined | ||
| } | ||
| return { | ||
| ...state, | ||
| embed: { | ||
| ...state.embed, | ||
| media: nextMedia, | ||
| }, | ||
| } | ||
| } | ||
| return state | ||
| } | ||
| default: | ||
| return state | ||
| } | ||
| } | ||
|
|
||
| export function createComposerState({ | ||
| initImageUris, | ||
| }: { | ||
| initImageUris: ComposerOpts['imageUris'] | ||
| }): ComposerState { | ||
| let media: ImagesMedia | undefined | ||
| if (initImageUris?.length) { | ||
| media = { | ||
| type: 'images', | ||
| images: createInitialImages(initImageUris), | ||
| labels: [], | ||
| } | ||
| } | ||
| return { | ||
| embed: { | ||
| record: undefined, | ||
| media, | ||
| }, | ||
| } | ||
| } |