This is DragCoordinator.m in view mode; [Download] [Up]
/* Generated by Interface Builder */
#import "DragCoordinator.h"
#import "CardHolder.h"
#import "GameCoordinator.h"
#import "StackView.h"
#import <appkit/View.h>
#import <objc/List.h>
// Recursivly search through the view hierarchy looking
// for a tracking view.
static CardHolder *findTrackingView( View * , const NXPoint * );
@implementation DragCoordinator
- setTarget:anObject
{
target = anObject;
return self;
}
- cardDragged:( const NXPoint * )dragPoint
{
CardHolder *receivingView = findTrackingView([ gameWindow contentView ], dragPoint );
// Handle highlighting.
// If you notice very carefully I send messages to the
// value nil. Doesn't bother me. Bother you?
if( receivingView ) {
// We're over a tracking view.
// Unhighlight the old tracking view and highlight
// the new view--if they're different.
if( currentTrackView != receivingView ) {
[ currentTrackView trackingHighlighted:NO ];
[ receivingView trackingHighlighted:YES ];
currentTrackView = receivingView;
}
} else {
// We're not over a tracking view.
// Unhighlight the old tracking view.
[ currentTrackView trackingHighlighted:NO ];
currentTrackView = nil;
}
return self;
}
- cardReleased:aCard at:( const NXPoint * )releasePoint
{
CardHolder *receivingView = findTrackingView([ gameWindow contentView ], releasePoint );
if( receivingView ) {
CardHolder *oldHolder = [[ aCard superview ] baseHolder ],
*newHolder = [ receivingView baseHolder ];
// Inform the target of the card movement.
// It will decide if the move is valid and if so it
// will perform the view disconnect/connect.
[ target card:aCard movedFrom:oldHolder to:newHolder ];
} else
// Card wasn't released over a tracking view.
// Beep.
NXBeep ();
// Unhighlight the previous tracking view.
[ currentTrackView trackingHighlighted:NO ];
currentTrackView = nil;
return self;
}
// Hits are tricky things.
// If you're moving a card over a stack then the
// hitTest: method will return the stack; Hovever, if
// there is a card on the stack the hitTest: method
// returns the card. Therefore, the view returned
// by hitTest: is recursivly searched until the ultimate
// goal is reached.
// We're looking for a view under the cursor that
// is a enabled tracking view.
static CardHolder *findTrackingView( View *view, const NXPoint *windowPoint )
{
CardHolder *theView = nil,
*hitView = [ view hitTest:windowPoint ];
if([ hitView respondsTo:@selector(isTrackingEnabled) ])
if([ hitView isTrackingEnabled ])
theView = hitView;
if( !theView ) {
do {
if( hitView = [ hitView superview ]) {
NXRect boundsRect;
NXPoint mousePoint = *windowPoint;
if([[[ hitView getBounds:&boundsRect ] convertPoint:&mousePoint fromView:nil ] mouse:&mousePoint inRect:&boundsRect ])
if([ hitView respondsTo:@selector(isTrackingEnabled) ])
if([ hitView isTrackingEnabled ])
theView = hitView;
}
} while( !theView && hitView );
}
return theView;
}
@end
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.