keyDown not being called - objective-c

Question

I have a custom NSView called SurfaceView. It is the contentView of a NSWindow and it handles basic events like mouse click and drawing. But don't matters what I do, it does not handle the keyDown function. I've already override the acceptsFirstResponder but nothing happens.
If it matters, I run the application using a custom NSEvent loop, shown below:
NSDictionary* info = [[NSBundle mainBundle] infoDictionary];
NSString* mainNibName = [info objectForKey:#"NSMainNibFile"];
NSApplication* app = [NSApplication sharedApplication];
NSNib* mainNib = [[NSNib alloc] initWithNibNamed:mainNibName bundle:[NSBundle mainBundle]];
[mainNib instantiateNibWithOwner:app topLevelObjects:nil];
[app finishLaunching];
while(true)
{
NSEvent* event = [app nextEventMatchingMask:NSAnyEventMask untilDate:[NSDate date] inMode:NSDefaultRunLoopMode dequeue:YES];
[app sendEvent:event];
// Some code is execute here every frame to do some tasks...
usleep(5000);
}
Here's the SurfaceView code:
#interface SurfaceView : NSView
{
Panel* panel;
}
#property (nonatomic) Panel* panel;
- (void)drawRect:(NSRect)dirtyRect;
- (BOOL)isFlipped;
- (void)mouseDown:(NSEvent *)theEvent;
- (void)mouseDragged:(NSEvent *)theEvent;
- (void)mouseUp:(NSEvent *)theEvent;
- (void)keyDown:(NSEvent *)theEvent;
- (BOOL)acceptsFirstResponder;
- (BOOL)becomeFirstResponder;
#end
--
#implementation SurfaceView
#synthesize panel;
- (BOOL)acceptsFirstResponder
{
return YES;
};
- (void)keyDown:(NSEvent *)theEvent
{
// this function is never called
};
...
#end
Here's how I create the view:
NSWindow* window = [[NSWindow alloc] initWithContentRect:NSMakeRect(left, top, wide, tall) styleMask:NSBorderlessWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask backing:NSBackingStoreBuffered defer:NO];
...
[window makeKeyAndOrderFront:nil];
SurfaceView* mainView = [SurfaceView alloc];
[mainView initWithFrame:NSMakeRect(0, 0, wide, tall)];
mainView.panel = panel;
[window setContentView:mainView];
[window setInitialFirstResponder:mainView];
[window setNextResponder:mainView];
[window makeFirstResponder:mainView];

Answer 1

I found out what was preventing the keyDown event from being called. It was the NSBorderlessWindowMask mask, it prevents the window from become the key and main window. So I have created a subclass of NSWindow called BorderlessWindow:
#interface BorderlessWindow : NSWindow
{
}
#end
#implementation BorderlessWindow
- (BOOL)canBecomeKeyWindow
{
return YES;
}
- (BOOL)canBecomeMainWindow
{
return YES;
}
#end

Answer 2

In addition to answer: Check in your IB checkbox for NSWindow.
Title Bar should be checked. It the similar to NSBorderlessWindowMask

Answer 3

In my case I had to override the keyDown method on both NSView and NSWindow (created a customization of both). In the NSWindow in the keyDown override I had to call
- (void) keyDown:(NSEvent *) event {
if (self.firstResponder != self) {
[self.firstResponder keyDown:event];
}
}
to let the event reach the view. Of course I had also to call makeFirstResponder first on the NSWindow and pass the contentView to it :
[window makeFirstResponder: [window contentView] ];