fix: better heuristic for windows of same app (closes #12)

alt-tab-macos/logic/WindowManager.swift

@@ -41,31 +41,13 @@ func computeDownscaledSize(_ image: NSImage) -> (Int, Int) {
     }
 }
 
-func cgMakeshiftId(_ window: NSDictionary) -> (String, pid_t, CGWindowID, String) {
-    let cgId = window[kCGWindowNumber] as! CGWindowID
-    let cgOwnerPid = window[kCGWindowOwnerPID] as! pid_t
-    let cgBounds = window[kCGWindowBounds] as! [String: Int]
-    let cgTitle = String(window[kCGWindowName] as! NSString)
-    let cgMakeshiftId = String(cgBounds["X"]!) + String(cgBounds["Y"]!)
-            + String(cgBounds["Width"]!) + String(cgBounds["Height"]!)
-            + cgTitle
-    return (cgMakeshiftId, cgOwnerPid, cgId, cgTitle)
-}
-
-func axMakeshiftId(_ element: AXUIElement) -> String {
-    let titleAttribute = AXUIElementCopyAttributeValue(element, kAXTitleAttribute, String.self)!
-    let pos = AXValueGetValue(element, kAXPositionAttribute, NSPoint(), AXValueType.cgPoint)!
-    let size = AXValueGetValue(element, kAXSizeAttribute, NSSize(), AXValueType.cgSize)!
-    return String(Int(pos.x)) + String(Int(pos.y))
-            + String(Int(size.width)) + String(Int(size.height))
-            + titleAttribute
-}
-
 func axWindows(_ cgOwnerPid: pid_t) -> [AXUIElement] {
     if let windows = AXUIElementCopyAttributeValue(AXUIElementCreateApplication(cgOwnerPid), kAXWindowsAttribute, [AXUIElement].self) {
         return windows.filter {
             let hasTitle = !(AXUIElementCopyAttributeValue($0, kAXTitleAttribute, String.self) ?? "").isEmpty
-            return hasTitle
+            // workaround: some apps like chrome use a window to implement the search popover
+            let isReasonablyTall = AXValueGetValue($0, kAXSizeAttribute, NSSize(), AXValueType.cgSize)!.height > 200
+            return hasTitle && isReasonablyTall
         }
     }
     return []

alt-tab-macos/ui/Application.swift

@@ -121,14 +121,15 @@ class Application: NSApplication, NSApplicationDelegate, NSWindowDelegate, NSCol
 
     func computeOpenWindows() {
         openWindows.removeAll()
+        var pidAndCurrentIndex: [pid_t: Int] = [:]
         for cgWindow in cgWindows() {
-            let (cgMakeshiftId_, cgOwnerPid, cgId, cgTitle) = cgMakeshiftId(cgWindow)
-            for axWindow in axWindows(cgOwnerPid) {
-                if axMakeshiftId(axWindow).starts(with: cgMakeshiftId_) {
-                    openWindows.append(OpenWindow(target: axWindow, ownerPid: cgOwnerPid, cgId: cgId, cgTitle: cgTitle))
-                    break
-                }
-            }
+            let cgId = cgWindow[kCGWindowNumber] as! CGWindowID
+            let cgTitle = String(cgWindow[kCGWindowName] as! NSString)
+            let cgOwnerPid = cgWindow[kCGWindowOwnerPID] as! pid_t
+            let i = pidAndCurrentIndex.index(forKey: cgOwnerPid)
+            pidAndCurrentIndex[cgOwnerPid] = i == nil ? 0 : pidAndCurrentIndex[i!].value + 1
+            let axWindow = axWindows(cgOwnerPid)[pidAndCurrentIndex[cgOwnerPid]!]
+            openWindows.append(OpenWindow(target: axWindow, ownerPid: cgOwnerPid, cgId: cgId, cgTitle: cgTitle))
         }
     }