/*
 * Copyright (C) 2005, 2006 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer. 
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution. 
 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import <Foundation/Foundation.h>

#import <AppKit/AppKit.h>

#define WebDragImageAlpha 0.75f

@class DOMElement;
@class WebFrameView;
@class WebView;

@interface NSView (WebExtras)

// Returns the nearest enclosing view of the given class, or nil if none.
- (NSView *)_web_superviewOfClass:(Class)viewClass;
- (WebFrameView *)_web_parentWebFrameView;
- (WebView *)_webView;

// returns whether a drag should begin starting with mouseDownEvent; if the time
// passes expiration or the mouse moves less than the hysteresis before the mouseUp event,
// returns NO, else returns YES.
- (BOOL)_web_dragShouldBeginFromMouseDown:(NSEvent *)mouseDownEvent
                           withExpiration:(NSDate *)expiration
                              xHysteresis:(float)xHysteresis
                              yHysteresis:(float)yHysteresis;

// Calls _web_dragShouldBeginFromMouseDown:withExpiration:xHysteresis:yHysteresis: with
// the default values for xHysteresis and yHysteresis
- (BOOL)_web_dragShouldBeginFromMouseDown:(NSEvent *)mouseDownEvent
                           withExpiration:(NSDate *)expiration;

// Convenience method. Returns NSDragOperationCopy if _web_bestURLFromPasteboard doesn't return nil.
// Returns NSDragOperationNone otherwise.
- (NSDragOperation)_web_dragOperationForDraggingInfo:(id <NSDraggingInfo>)sender;

- (BOOL)_web_firstResponderIsSelfOrDescendantView;

@end

