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Mac Forum / Programming / Mac Programming / February 2005Handling mouse events in a view
Hi, What is the best way to handle mouse events inside of a view? For example, I have an array of objects of various shape, size and location which I draw in a view. I'll need to assign actions for mouse-overs and clicks inside of the various objects. Does the view 'know' the boundaries of my object when it is drawn, for example, a complex shape with bezier curves, or do I need to write code that determines whether a specific click-point is inside or outside of the shape? I'm mostly interested in solving the problem in Objective-C/Cocoa. I've done this in Java with simple shapes using contains(), though any additional input on Java would be appreciated, too. Thanks. Paul M. > Hi, > What is the best way to handle mouse events inside of a view? For [quoted text clipped - 7 lines] > in Java with simple shapes using contains(), though any additional > input on Java would be appreciated, too. Thanks. First you should take a look to NSResponder Class. NSView inherits from this class. All common mouse actions are defined there. In your custom view you would overwrite - (void)mouseMoved:(NSEvent *)theEvent In this function you can ask the your objects if they contain (NSBezierPath (BOOL)containsPoint:aPoint ) the point of your mouse position (NSEvent mouseLocation). Florian  SignatureThis message was send with Xnntp - free Mac OSX (10.3) nntp-newsreader Download Xnntp at http://www.edv-consulting-berlin.de/Xnntp. > What is the best way to handle mouse events inside of a view? For > example, I have an array of objects of various shape, size and location [quoted text clipped - 6 lines] > in Java with simple shapes using contains(), though any additional > input on Java would be appreciated, too. Thanks. You might want to take a look at <http://homepage.mac.com/mmalc/CocoaExamples/controllers.html>, particularly <http://homepage.mac.com/mmalc/CocoaExamples/GraphicsBindings.zip> for some ideas. You should also look at: <file:///Developer/Examples/AppKit/Sketch/ToDo.txt> and the other material in that "Sketch" folder. SignatureDavid Phillip Oster > Hi, > What is the best way to handle mouse events inside of a view? For [quoted text clipped - 4 lines] > with bezier curves, or do I need to write code that determines whether > a specific click-point is inside or outside of the shape? Well, both. You write the code, but if you write it in an object-oriented fashion then the view will just "know". m. Signaturematt neuburg, phd = matt@tidbits.com, http://www.tidbits.com/matt/ AppleScript: The Definitive Guide http://www.amazon.com/exec/obidos/ASIN/0596005571/somethingsbymatt Read TidBITS! It's free and smart. http://www.tidbits.com |
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