Using NSPoint Mouse Tracking on NSView - objective-c

Question

I have this method in App Delegate that makes a window and content view but I want to be able to track the mouse using an NSPoint on entered and exiting the view. The problem is I do not want to make a NSView Custom class and want to do it all within my AppDelegate. The mouse tracking (at the bottom) does not work, any suggestions?
- (void)toggleHelpDisplay
{
// Create helpWindow.
NSRect mainFrame = [[NSScreen mainScreen] frame];
NSRect helpFrame = NSZeroRect;
float width = 75;
float height = 75;
helpFrame.origin.x = (mainFrame.size.width - width) / 2.0;
helpFrame.origin.y = 200.0;
helpFrame.size.width = width;
helpFrame.size.height = height;
helpWindow = [[BrightnessView windowWithFrame:helpFrame] retain];
// Configure window.
[helpWindow setReleasedWhenClosed:YES];
[helpWindow setHidesOnDeactivate:NO];
[helpWindow setCanHide:NO];
[helpWindow setCollectionBehavior:NSWindowCollectionBehaviorCanJoinAllSpaces];
[helpWindow setIgnoresMouseEvents:NO];
// Configure contentView.
NSView *contentView = [helpWindow contentView];
[contentView setWantsLayer:YES];
CATextLayer *layer = [CATextLayer layer];
layer.opacity = 0;
[contentView setLayer:layer];
CGColorRef bgColor = CGColorCreateGenericGray(0.0, 0.6);
layer.backgroundColor = bgColor;
CGColorRelease(bgColor);
layer.string = ? HELP_TEXT : HELP_TEXT_OFF;
layer.contentsRect = CGRectMake(0, 0, 1, 1.2);
layer.fontSize = 40.0;
layer.foregroundColor = CGColorGetConstantColor(kCGColorWhite);
layer.borderColor = CGColorGetConstantColor(kCGColorWhite);
layer.borderWidth = 4.0;
layer.cornerRadius = 4.0;
layer.alignmentMode = kCAAlignmentCenter;
[window addChildWindow:helpWindow ordered:NSWindowAbove];
float helpOpacity = (([NSApp isActive] ? 1 : 0));
[[[helpWindow contentView] layer] setOpacity:helpOpacity];
//track mouse so that once hovered make larger.
NSPoint mouseLocation = [[self window] mouseLocationOutsideOfEventStream];
if (NSPointInRect(mouseLocation, helpFrame)) {
NSLog(#"mouse over");
}
else
{
NSLog(#"mouse not over");
}
}

Answer 1

You should be able to do this using NSTrackingArea; You'd do something like this (typed in the browser, not tested):
self.helpView = contentView; // Need to store a reference to the view if you want to convert from its coordinate system
// Set up a tracking area
NSTrackingArea *trackingArea = [[[NSTrackingArea alloc] initWithRect:[self.helpView bounds]
options:NSTrackingActiveInActiveApp | NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved
owner:self
userInfo:nil] autorelease];
[self.helpView addTrackingArea:trackingArea];
- (void)mouseEntered:(NSEvent *)event;
{
NSPoint location = [self.helpView convertPoint:[event locationInWindow] fromView:nil];
// Do whatever you want to do in response to mouse entering
}
- (void)mouseExited:(NSEvent *)event;
{
NSPoint location = [self.helpView convertPoint:[event locationInWindow] fromView:nil];
// Do whatever you want to do in response to mouse exiting
}
- (void)mouseMoved:(NSEvent *)event;
{
NSPoint location = [self.helpView convertPoint:[event locationInWindow] fromView:nil];
// Do whatever you want to do in response to mouse movements
}