I'd like to change the drag image based on the drop location, the way iCal
does. I found this tantalizing snippet in the WebCore code:
if (cocoaImage) {
// Dashboard wants to be able to set the drag image during dragging,
but Cocoa does not allow this.
// Instead we must drop down to the CoreGraphics API.
wkSetDragImage(cocoaImage, cocoaLoc);
// Hack: We must post an event to wake up the NSDragManager, which is
sitting in a nextEvent call
// up the stack from us because the CoreFoundation drag manager does
not use the run loop by itself.
// This is the most innocuous event to use, per Kristen Forster.
NSEvent* ev = [NSEvent mouseEventWithType:NSMouseMoved
location:NSZeroPoint
modifierFlags:0 timestamp:0 windowNumber:0 context:nil
eventNumber:0 clickCount:0 pressure:0];
[NSApp postEvent:ev atStart:YES];
}
http://www.opensource.apple.com/source/WebCore/WebCore-1A543a/platform/mac/ClipboardMac.mm
I can't find the implementation to wkSetDragImage(). Does anybody know what
CoreGraphics APIs are used to set the drag image?
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