allow drag-drop working dir

closes #2147

src/renderer/src/App.tsx

@@ -2281,11 +2281,21 @@ function App() {
 
       focusWindow();
 
-      await userOpenFiles(filePaths);
+      userOpenFiles(filePaths);
+    }
+    const element = videoContainerRef.current;
+    element?.addEventListener('drop', onDrop);
+    return () => element?.removeEventListener('drop', onDrop);
+  }, [userOpenFiles, videoContainerRef]);
+
+  useEffect(() => {
+    function onDrop(ev: DragEvent) {
+      // default drop handler to prevent new electron window from popping up https://github.com/electron/electron/issues/39839
+      ev.preventDefault();
     }
     document.body.addEventListener('drop', onDrop);
     return () => document.body.removeEventListener('drop', onDrop);
-  }, [userOpenFiles]);
+  }, []);
 
   const renderOutFmt = useCallback((style: CSSProperties) => (
     <OutputFormatSelect style={style} detectedFileFormat={detectedFileFormat} fileFormat={fileFormat} onOutputFormatUserChange={onOutputFormatUserChange} />

src/renderer/src/NoFileLoaded.tsx

@@ -5,11 +5,15 @@ import { useTranslation, Trans } from 'react-i18next';
 import SetCutpointButton from './components/SetCutpointButton';
 import SimpleModeButton from './components/SimpleModeButton';
 import useUserSettings from './hooks/useUserSettings';
+import { StateSegment } from './types';
 
 const electron = window.require('electron');
 
 function NoFileLoaded({ mifiLink, currentCutSeg, onClick, darkMode }: {
-  mifiLink: unknown, currentCutSeg, onClick: () => void, darkMode?: boolean,
+  mifiLink: unknown,
+  currentCutSeg: StateSegment,
+  onClick: () => void,
+  darkMode?: boolean,
 }) {
   const { t } = useTranslation();
   const { simpleMode } = useUserSettings();

src/renderer/src/TopMenu.tsx

@@ -1,4 +1,4 @@
-import { CSSProperties, ReactNode, memo, useCallback } from 'react';
+import { CSSProperties, ReactNode, memo, useCallback, useEffect, useRef } from 'react';
 import { IoIosSettings } from 'react-icons/io';
 import { FaLock, FaUnlock } from 'react-icons/fa';
 import { CrossIcon, ListIcon, VolumeUpIcon, VolumeOffIcon } from 'evergreen-ui';
@@ -13,6 +13,8 @@ import useUserSettings from './hooks/useUserSettings';
 import { InverseCutSegment } from './types';
 
 
+const { stat } = window.require('fs/promises');
+
 const outFmtStyle = { height: 20, maxWidth: 100 };
 const exportModeStyle = { flexGrow: 0, flexBasis: 140 };
 
@@ -44,7 +46,8 @@ function TopMenu({
   clearOutDir: () => void,
 }) {
   const { t } = useTranslation();
-  const { customOutDir, changeOutDir, simpleMode, outFormatLocked, setOutFormatLocked } = useUserSettings();
+  const { customOutDir, changeOutDir, setCustomOutDir, simpleMode, outFormatLocked, setOutFormatLocked } = useUserSettings();
+  const workingDirButtonRef = useRef<HTMLButtonElement>(null);
 
   const onOutFormatLockedClick = useCallback(() => setOutFormatLocked((v) => (v ? undefined : fileFormat)), [fileFormat, setOutFormatLocked]);
 
@@ -55,6 +58,22 @@ function TopMenu({
     return <Icon onClick={onOutFormatLockedClick} title={t('Lock/unlock output format')} size={14} style={{ marginRight: 7, marginLeft: 2, color: outFormatLocked ? primaryTextColor : undefined }} />;
   }
 
+  // Convenience for drag and drop: https://github.com/mifi/lossless-cut/issues/2147
+  useEffect(() => {
+    async function onDrop(ev: DragEvent) {
+      ev.preventDefault();
+      if (!ev.dataTransfer) return;
+      const paths = [...ev.dataTransfer.files].map((f) => f.path);
+      const [firstPath] = paths;
+      if (paths.length === 1 && firstPath && (await stat(firstPath)).isDirectory()) {
+        setCustomOutDir(firstPath);
+      }
+    }
+    const element = workingDirButtonRef.current;
+    element?.addEventListener('drop', onDrop);
+    return () => element?.removeEventListener('drop', onDrop);
+  }, [setCustomOutDir]);
+
   return (
     <div
       className="no-user-select"
@@ -93,6 +112,7 @@ function TopMenu({
       )}
 
       <Button
+        ref={workingDirButtonRef}
         onClick={withBlur(changeOutDir)}
         title={customOutDir}
         style={{ paddingLeft: showClearWorkingDirButton ? 4 : undefined }}

src/renderer/src/components/Button.tsx

@@ -1,12 +1,11 @@
-import { ButtonHTMLAttributes, memo } from 'react';
+import { ButtonHTMLAttributes, DetailedHTMLProps, forwardRef } from 'react';
 
 import styles from './Button.module.css';
 
-function Button({ type = 'button', ...props }: ButtonHTMLAttributes<HTMLButtonElement>) {
-  return (
+// eslint-disable-next-line react/display-name
+const Button = forwardRef<HTMLButtonElement, DetailedHTMLProps<ButtonHTMLAttributes<HTMLButtonElement>, HTMLButtonElement>>(({ type = 'button', ...props }, ref) => (
   // eslint-disable-next-line react/jsx-props-no-spreading, react/button-has-type
-    <button className={styles['button']} type={type} {...props} />
-  );
-}
+  <button ref={ref} className={styles['button']} type={type} {...props} />
+));
 
-export default memo(Button);
+export default Button;