On 20 Oct 2007, at 10:20 PM, Richard Somers wrote:
Apple provides a sample application called Sketch found in the
AppKit folder. In the SKTGraphicView.m file there is a single mouse
related method mouseDown:. There are no mouseDragged:, mouseUp:, or
mouseMoved: methods.
My question is how does this application get information on a mouse
dragged operation? The dragging functionality works but I can not
see how or where this is implemented in the code.
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.
This is no longer a recommended way to handle dragging. Provide the
mouseXXX: methods.
— F
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