objective-c - ratón - mouseadapter

mouseEntered y mouseExited no se llama en NSImageView SubClass

Question

NSImageView una subclase de NSImageView para capturar eventos mouseEntered y mouseExited . Pero solo los eventos mouseUp y mouseDown son llamados. ¿Cómo capturar los eventos mouseEntered y mouseExited en la subclase NSImageView ?

Answer 1

Si desea usar mouseEntered: y mouseExited: necesita usar NSTrackingArea . Aquí está la referencia NSTrackingArea Class Reference .

Ejemplo:

//Add this to Your imageView subclass
-(void)mouseEntered:(NSEvent *)theEvent {
NSLog(@"Mouse entered");
}
-(void)mouseExited:(NSEvent *)theEvent
{
NSLog(@"Mouse exited");
}
-(void)updateTrackingAreas
{
[super updateTrackingAreas];
if(trackingArea != nil) {
[self removeTrackingArea:trackingArea];
[trackingArea release];
}
int opts = (NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways);
trackingArea = [ [NSTrackingArea alloc] initWithRect:[self bounds]
options:opts
owner:self
userInfo:nil];
[self addTrackingArea:trackingArea];
}

Answer 2

Swift 4 versión de la respuesta de Justin Boo

override func updateTrackingAreas() {
for trackingArea in self.trackingAreas {
self.removeTrackingArea(trackingArea)
}
let options: NSTrackingArea.Options = [.mouseEnteredAndExited, .activeAlways]
let trackingArea = NSTrackingArea(rect: self.bounds, options: options, owner: self, userInfo: nil)
self.addTrackingArea(trackingArea)
}

Answer 3

Versión C # Xamarin de la respuesta de Justin Boo.

public override void UpdateTrackingAreas ()
{
base.UpdateTrackingAreas ();
foreach (var item in TrackingAreas ()) {
RemoveTrackingArea (item);
}
var options = NSTrackingAreaOptions.MouseEnteredAndExited | NSTrackingAreaOptions.ActiveAlways;
var trackingArea = new NSTrackingArea (this.Bounds, options, this, null);
AddTrackingArea (trackingArea);
}

Answer 4

Swift 3 versión de la respuesta de @Justin Boo :

private var trackingArea: NSTrackingArea?
override func updateTrackingAreas() {
if let trackingArea = self.trackingArea {
self.removeTrackingArea(trackingArea)
}
let options: NSTrackingAreaOptions = [.mouseEnteredAndExited, .activeAlways]
let trackingArea = NSTrackingArea(rect: self.bounds, options: options, owner: self, userInfo: nil)
self.addTrackingArea(trackingArea)
}