macos-window-management.mm

#import <Foundation/Foundation.h>
#import <AppKit/AppKit.h>
#include <node.h>
#include <string>

using namespace v8;

void getWindows(const FunctionCallbackInfo<Value>& args) {
  Isolate *isolate = args.GetIsolate();
  Local<Array> winArr = Array::New(isolate);

  CGWindowListOption listOptions = kCGWindowListOptionOnScreenOnly | kCGWindowListExcludeDesktopElements;
  CFArrayRef windowList = CGWindowListCopyWindowInfo(listOptions, kCGNullWindowID);

  NSUInteger i = 0;
  for (NSDictionary *info in (NSArray *)windowList) {
    Local<Object> result = Object::New(isolate);

    NSString *applicationName = info[(id)kCGWindowOwnerName];
    NSNumber *ownerPid = info[(id)kCGWindowOwnerPID];
    NSString *windowName = info[(id)kCGWindowName];
    NSNumber *windowNumber = info[(id)kCGWindowNumber];

    int alpha = [info[(id)kCGWindowAlpha] intValue];
    int layer = [info[(id)kCGWindowLayer] intValue];

    if (layer > 0 || alpha == 0) continue;

    CGRect bounds;
    CGRectMakeWithDictionaryRepresentation((CFDictionaryRef)info[(id)kCGWindowBounds], &bounds);

    result->Set(
      String::NewFromUtf8(isolate, "id"),
      Number::New(isolate, [windowNumber intValue])
    );
    result->Set(
      String::NewFromUtf8(isolate, "alpha"),
      Number::New(isolate, alpha)
    );
    result->Set(
      String::NewFromUtf8(isolate, "layer"),
      Number::New(isolate, layer)
    );
    result->Set(
      String::NewFromUtf8(isolate, "owner"),
      String::NewFromUtf8(isolate, [applicationName UTF8String])
    );
    result->Set(
      String::NewFromUtf8(isolate, "ownerPid"),
      Number::New(isolate, [ownerPid intValue])
    );
    result->Set(
      String::NewFromUtf8(isolate, "title"),
      String::NewFromUtf8(isolate, [windowName UTF8String])
    );
    result->Set(String::NewFromUtf8(isolate, "x"), Number::New(isolate, bounds.origin.x));
    result->Set(String::NewFromUtf8(isolate, "y"), Number::New(isolate, bounds.origin.y));
    result->Set(String::NewFromUtf8(isolate, "width"), Number::New(isolate, bounds.size.width));
    result->Set(String::NewFromUtf8(isolate, "height"), Number::New(isolate, bounds.size.height));

    winArr->Set(i, result);
    i++;
  }

  args.GetReturnValue().Set(winArr);
}

void Init(Local<Object> exports, Local<Object> module) {
  NODE_SET_METHOD(exports, "getWindows", getWindows);
}

NODE_MODULE(addon, Init)