1 files changed, 85 insertions, 0 deletions
diff --git a/src/state/shell/composer.tsx b/src/state/shell/composer.tsx
new file mode 100644
index 000000000..bdf5e4a7a
--- /dev/null
+++ b/src/state/shell/composer.tsx
@@ -0,0 +1,85 @@
+import React from 'react'
+import {AppBskyEmbedRecord} from '@atproto/api'
+import {useNonReactiveCallback} from '#/lib/hooks/useNonReactiveCallback'
+
+export interface ComposerOptsPostRef {
+  uri: string
+  cid: string
+  text: string
+  author: {
+    handle: string
+    displayName?: string
+    avatar?: string
+  }
+}
+export interface ComposerOptsQuote {
+  uri: string
+  cid: string
+  text: string
+  indexedAt: string
+  author: {
+    did: string
+    handle: string
+    displayName?: string
+    avatar?: string
+  }
+  embeds?: AppBskyEmbedRecord.ViewRecord['embeds']
+}
+export interface ComposerOpts {
+  replyTo?: ComposerOptsPostRef
+  onPost?: () => void
+  quote?: ComposerOptsQuote
+  mention?: string // handle of user to mention
+}
+
+type StateContext = ComposerOpts | undefined
+type ControlsContext = {
+  openComposer: (opts: ComposerOpts) => void
+  closeComposer: () => boolean
+}
+
+const stateContext = React.createContext<StateContext>(undefined)
+const controlsContext = React.createContext<ControlsContext>({
+  openComposer(_opts: ComposerOpts) {},
+  closeComposer() {
+    return false
+  },
+})
+
+export function Provider({children}: React.PropsWithChildren<{}>) {
+  const [state, setState] = React.useState<StateContext>()
+
+  const openComposer = useNonReactiveCallback((opts: ComposerOpts) => {
+    setState(opts)
+  })
+
+  const closeComposer = useNonReactiveCallback(() => {
+    let wasOpen = !!state
+    setState(undefined)
+    return wasOpen
+  })
+
+  const api = React.useMemo(
+    () => ({
+      openComposer,
+      closeComposer,
+    }),
+    [openComposer, closeComposer],
+  )
+
+  return (
+    <stateContext.Provider value={state}>
+      <controlsContext.Provider value={api}>
+        {children}
+      </controlsContext.Provider>
+    </stateContext.Provider>
+  )
+}
+
+export function useComposerState() {
+  return React.useContext(stateContext)
+}
+
+export function useComposerControls() {
+  return React.useContext(controlsContext)
+}