Notification while driving NSWindow

I have a solution that allows you to determine the position of a window while dragging it.

Two problems are that there is no built-in way to receive notifications while dragging a window, and that the window frame is not updated until it stops moving. My approach works around these issues by setting up a repeating timer and tracking cursor movement.

NSWindowWillMoveNotification NSWindowDidMoveNotification, , .

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(windowWillMove:)
                                             name:@"NSWindowWillMoveNotification"
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(windowDidMove:)
                                             name:@"NSWindowDidMoveNotification"
                                           object:nil];

- , , " ".

- (void)windowWillMove:(NSNotification *)notification {
    if (notification.object == self.view.window) { // make sure we have the right window
        self.dragCursorStartPos = [NSEvent mouseLocation];
        const NSTimeInterval dragDelaySeconds = 0.1; // polling rate delay
        self.dragWindowTimer = [NSTimer scheduledTimerWithTimeInterval:dragDelaySeconds
                                                                target:self
                                                              selector:@selector(myMethod)
                                                              userInfo:nil
                                                               repeats:YES];
    }
}

, .

- (void)windowDidMove:(NSNotification *)notification {
    if (notification.object == self.view.window) { // make sure we have the right window
        if (self.dragWindowTimer != NULL) {
            [self.dragWindowTimer invalidate];
            self.dragWindowTimer = NULL;
        }
    }
}

/ , , , .

- (void)myMethod {
    NSPoint cursorPos = [NSEvent mouseLocation];
    NSPoint cursorDisplacement = NSMakePoint(cursorPos.x - self.dragCursorStartPos.x, cursorPos.y - self.dragCursorStartPos.y);
    CGPoint frameOrigin = self.view.window.frame.origin;
    CGPoint actualFrameOrigin = CGPointMake(frameOrigin.x + cursorDisplacement.x, frameOrigin.y + cursorDisplacement.y);
    NSLog(@"The frame actual origin is (%f, %f)", actualFrameOrigin.x, actualFrameOrigin.y);
}

actualFrameOrigin myMethod , , self.view.window.frame.origin .

, !

, , , NSWindowWillMoveNotification, NSWindowDidMoveNotification, . , , myMethod, (pressedButtons & (1 << 0)) == (1 << 0). , .