Improve 'windows' OS detection of taskbar location

src/Menubar.ts

@@ -138,6 +138,14 @@ export class Menubar extends EventEmitter {
 		if (!this._browserWindow) {
 			throw new Error('Window has been initialized just above. qed.');
 		}
+
+		// 'Windows' taskbar: sync windows position each time before showing
+		// https://github.com/maxogden/menubar/issues/232
+		if (process.platform === 'win32') {
+			// Fill in this._options.windowPosition when taskbar position is available
+			this._options.windowPosition = getWindowPosition(this.tray);
+		}
+
 		this.emit('show');
 
 		if (trayPos && trayPos.x !== 0) {
@@ -172,26 +180,11 @@ export class Menubar extends EventEmitter {
 			this._options.browserWindow.x !== undefined
 				? this._options.browserWindow.x
 				: position.x;
-		let y =
+		const y =
 			this._options.browserWindow.y !== undefined
 				? this._options.browserWindow.y
 				: position.y;
 
-		// Multi-Taskbar: optimize vertical position
-		// https://github.com/maxogden/menubar/pull/217
-		if (process.platform === 'win32') {
-			if (
-				trayPos &&
-				this._options.windowPosition &&
-				this._options.windowPosition.startsWith('bottom')
-			) {
-				y =
-					trayPos.y +
-					trayPos.height / 2 -
-					this._browserWindow.getBounds().height / 2;
-			}
-		}
-
 		// `.setPosition` crashed on non-integers
 		// https://github.com/maxogden/menubar/issues/233
 		this._browserWindow.setPosition(Math.round(x), Math.round(y));

src/util/getWindowPosition.ts

@@ -4,7 +4,20 @@
 
 /** */
 
-import { Tray } from 'electron';
+import { Rectangle, screen as electronScreen, Tray } from 'electron';
+
+const trayToScreenRects = (tray: Tray): [Rectangle, Rectangle] => {
+	// There may be more than one screen, so we need to figure out on which screen our tray icon lives.
+	const {
+		workArea,
+		bounds: screenBounds,
+	} = electronScreen.getDisplayMatching(tray.getBounds());
+
+	workArea.x -= screenBounds.x;
+	workArea.y -= screenBounds.y;
+
+	return [screenBounds, workArea];
+};
 
 type TaskbarLocation = 'top' | 'bottom' | 'left' | 'right';
 
@@ -16,23 +29,31 @@ type TaskbarLocation = 'top' | 'bottom' | 'left' | 'right';
  * @param tray - The Electron Tray instance.
  */
 export function taskbarLocation(tray: Tray): TaskbarLocation {
-	const trayBounds = tray.getBounds();
+	const [screenBounds, workArea] = trayToScreenRects(tray);
 
-	// Determine taskbar location
-	if (trayBounds.width !== trayBounds.height && trayBounds.y === 0) {
-		return 'top';
-	}
-	if (trayBounds.width !== trayBounds.height && trayBounds.y > 0) {
-		return 'bottom';
-	}
-	if (trayBounds.width === trayBounds.height && trayBounds.x < trayBounds.y) {
+	// TASKBAR LEFT
+	if (workArea.x > 0) {
+		// The workspace starts more on the right
 		return 'left';
 	}
-	if (trayBounds.width === trayBounds.height && trayBounds.x > trayBounds.y) {
+
+	// TASKBAR TOP
+	if (workArea.y > 0) {
+		return 'top';
+	}
+
+	// TASKBAR RIGHT
+	// Here both workArea.y and workArea.x are 0 so we can no longer leverage them.
+	// We can use the workarea and display width though.
+	// Determine taskbar location
+	if (workArea.width < screenBounds.width) {
+		// The taskbar is either on the left or right, but since the LEFT case was handled above,
+		// we can be sure we're dealing with a right taskbar
 		return 'right';
 	}
 
-	// By default, return 'bottom'
+	// TASKBAR BOTTOM
+	// Since all the other cases were handled, we can be sure we're dealing with a bottom taskbar
 	return 'bottom';
 }