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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 | 1x 1x 1x 1x 4x 4x 3x 3x 3x 4x 3x 4x 4x 4x | import { useCallback, useMemo } from "react";
import type {
OutgoingExtensionMessage,
StateChangedMessage,
ToolbarCommand,
ToolbarCommandMessage,
} from "@/types/messages";
interface VsCodeApi {
postMessage: (message: unknown) => void;
}
function getVsCodeApi(): VsCodeApi | null {
const maybeAcquire = (globalThis as typeof globalThis & { acquireVsCodeApi?: () => VsCodeApi })
.acquireVsCodeApi;
Iif (!maybeAcquire) {
return null;
}
try {
return maybeAcquire();
} catch {
return null;
}
}
export interface UsePostMessageResult {
postMessage: (message: OutgoingExtensionMessage) => void;
postStateChanged: (message: StateChangedMessage["state"]) => void;
postToolbarCommand: (command: ToolbarCommandMessage["command"]) => void;
postPreviewCode: () => void;
}
export function usePostMessage(): UsePostMessageResult {
const vscode = useMemo(() => getVsCodeApi(), []);
const postMessage = useCallback(
(message: OutgoingExtensionMessage) => {
Eif (vscode) {
vscode.postMessage(message);
return;
}
// Useful fallback during browser development outside VS Code webview.
console.debug("[webview-app] postMessage fallback", message);
},
[vscode],
);
const postStateChanged = useCallback(
(state: StateChangedMessage["state"]) => {
postMessage({ type: "stateChanged", state });
},
[postMessage],
);
const postToolbarCommand = useCallback(
(command: ToolbarCommand) => {
postMessage({ type: "toolbarCommand", command });
},
[postMessage],
);
const postPreviewCode = useCallback(() => {
postToolbarCommand("previewCode");
}, [postToolbarCommand]);
return {
postMessage,
postStateChanged,
postToolbarCommand,
postPreviewCode,
};
}
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