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Re: Mouse Dragging in Apple Sketch




On Oct 21, 2007, at 12:09 AM, Fritz Anderson wrote:

Read the code more carefully.

Examine the call tree
mouseDown:
	selectAndTrackMouseWithEvent:
		resizeGraphic:usingHandle:withEvent:
		moveSelectedGraphicsWithEvent:
		marqueeSelectWithEvent:

In all the methods below mouseDown:, the view goes into a tight loop, collecting events until the left mouse button goes up, and responding to them. The other mouseXXX: methods are not provided, because mouseDown: handles the events in-line.


The View Programming Guide for Cocoa covers this.

http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaViewsGuide/SubclassingNSView/chapter_5_section_4.html#/ /apple_ref/doc/uid/TP40002978-CH7-DontLinkElementID_19

This is no longer a recommended way to handle dragging. Provide the mouseXXX: methods.

Actually, both techniques are valid. It depends on the situation. The doc covers both cases, and discusses the differences/advantages.



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References: 
 >Mouse Dragging in Apple Sketch (From: Richard Somers <email@hidden>)
 >Re: Mouse Dragging in Apple Sketch (From: Fritz Anderson <email@hidden>)



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