Time4Midi/main.js

const { app, BrowserWindow, dialog, ipcMain } = require("electron");
const fs = require("node:fs/promises");
const path = require("node:path");

app.commandLine.appendSwitch("enable-blink-features", "WebMidi");

function createWindow() {
  const win = new BrowserWindow({
    width: 1600,
    height: 980,
    minWidth: 1200,
    minHeight: 760,
    backgroundColor: "#0f1117",
    icon: path.join(__dirname, "time4midi.png"),
    webPreferences: {
      contextIsolation: true,
      sandbox: false,
      preload: path.join(__dirname, "preload.js")
    }
  });

  win.loadFile(path.join(__dirname, "src", "index.html"));
}

ipcMain.handle("project:save", async (_event, payload) => {
  if (payload?.filePath) {
    await fs.writeFile(payload.filePath, payload.data, "utf8");
    return { canceled: false, filePath: payload.filePath };
  }

  const result = await dialog.showSaveDialog({
    defaultPath: payload?.defaultPath || "time4midi-project.json",
    filters: [
      { name: "Time4Midi Project", extensions: ["json"] }
    ]
  });

  if (result.canceled || !result.filePath) {
    return { canceled: true };
  }

  await fs.writeFile(result.filePath, payload.data, "utf8");
  return { canceled: false, filePath: result.filePath };
});

ipcMain.handle("project:load", async () => {
  const result = await dialog.showOpenDialog({
    properties: ["openFile"],
    filters: [
      { name: "Time4Midi Project", extensions: ["json"] }
    ]
  });

  if (result.canceled || result.filePaths.length === 0) {
    return { canceled: true };
  }

  const filePath = result.filePaths[0];
  const data = await fs.readFile(filePath, "utf8");
  return { canceled: false, filePath, data };
});

ipcMain.handle("audio:pickFile", async () => {
  const result = await dialog.showOpenDialog({
    properties: ["openFile"],
    filters: [
      { name: "Audio", extensions: ["mp3", "m4a", "flac", "wma"] }
    ]
  });

  if (result.canceled || result.filePaths.length === 0) {
    return { canceled: true };
  }

  return {
    canceled: false,
    filePath: result.filePaths[0]
  };
});

ipcMain.handle("app:getUserDataPath", () => {
  return app.getPath("userData");
});

ipcMain.handle("mappingLibrary:pickLoadFile", async (_event, payload) => {
  const result = await dialog.showOpenDialog({
    properties: ["openFile"],
    defaultPath: payload?.defaultPath || "time4midi-mappings.json",
    filters: [
      { name: "Time4Midi Mapping", extensions: ["json"] }
    ]
  });

  if (result.canceled || result.filePaths.length === 0) {
    return { canceled: true };
  }

  return {
    canceled: false,
    filePath: result.filePaths[0]
  };
});

ipcMain.handle("mappingLibrary:pickSaveFile", async (_event, payload) => {
  const result = await dialog.showSaveDialog({
    defaultPath: payload?.defaultPath || "time4midi-mappings.json",
    filters: [
      { name: "Time4Midi Mapping", extensions: ["json"] }
    ]
  });

  if (result.canceled || !result.filePath) {
    return { canceled: true };
  }

  return {
    canceled: false,
    filePath: result.filePath
  };
});

app.whenReady().then(() => {
  createWindow();

  app.on("activate", () => {
    if (BrowserWindow.getAllWindows().length === 0) {
      createWindow();
    }
  });
});

app.on("window-all-closed", () => {
  if (process.platform !== "darwin") {
    app.quit();
  }
});