/*

 * Copyright (C) 2005 Apple Computer, 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 Computer, 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 "WebClipView.h"

#import "WebFrameInternal.h"

#import "WebFrameView.h"

#import "WebViewPrivate.h"

#import <WebCore/FrameView.h>

// WebClipView's entire reason for existing is to set the clip used by focus ring redrawing.

// There's no easy way to prevent the focus ring from drawing outside the passed-in clip rectangle

// because it expects to have to draw outside the bounds of the view it's being drawn for.

// But it looks for the enclosing clip view, which gives us a hook we can use to control it.

// The "additional clip" is a clip for focus ring redrawing.

// FIXME: Change terminology from "additional clip" to "focus ring clip".

using namespace WebCore;

@interface NSView (WebViewMethod)

- (WebView *)_webView;

@end

@interface NSClipView (WebNSClipViewDetails)

- (void)_immediateScrollToPoint:(NSPoint)newOrigin;

@end

@implementation WebClipView

- (id)initWithFrame:(NSRect)frame

{

    self = [super initWithFrame:frame];

    if (!self)

        return nil;

    // In WebHTMLView, we set a clip. This is not typical to do in an

    // NSView, and while correct for any one invocation of drawRect:,

    // it causes some bad problems if that clip is cached between calls.

    // The cached graphics state, which clip views keep around, does

    // cache the clip in this undesirable way. Consequently, we want to 

    // release the GState for all clip views for all views contained in 

    // a WebHTMLView. Here we do it for subframes, which use WebClipView.

    // See these bugs for more information:

    // <rdar://problem/3409315>: REGRESSSION (7B58-7B60)?: Safari draws blank frames on macosx.apple.com perf page

    [self releaseGState];

    return self;

}

#if USE(ACCELERATED_COMPOSITING)

- (NSRect)visibleRect

{

    if (!_isScrolling)

        return [super visibleRect];

    WebFrameView *webFrameView = (WebFrameView *)[[self superview] superview];

    if (![webFrameView isKindOfClass:[WebFrameView class]])

        return [super visibleRect];

    if (Frame* coreFrame = core([webFrameView webFrame])) {

        if (FrameView* frameView = coreFrame->view()) {

            if (frameView->isEnclosedInCompositingLayer())

                return [self bounds];

        }

    }

    return [super visibleRect];

}

- (void)_immediateScrollToPoint:(NSPoint)newOrigin

{

    _isScrolling = YES;

    [super _immediateScrollToPoint:newOrigin];

    _isScrolling = NO;

}

#endif

- (void)resetAdditionalClip

{

    ASSERT(_haveAdditionalClip);

    _haveAdditionalClip = NO;

}

- (void)setAdditionalClip:(NSRect)additionalClip

{

    ASSERT(!_haveAdditionalClip);

    _haveAdditionalClip = YES;

    _additionalClip = additionalClip;

}

- (BOOL)hasAdditionalClip

{

    return _haveAdditionalClip;

}

- (NSRect)additionalClip

{

    ASSERT(_haveAdditionalClip);

    return _additionalClip;

}

- (NSRect)_focusRingVisibleRect

{

    NSRect rect = [self visibleRect];

    if (_haveAdditionalClip) {

        rect = NSIntersectionRect(rect, _additionalClip);

    }

    return rect;

}

- (void)scrollWheel:(NSEvent *)event

{

    NSView *docView = [self documentView];

    if ([docView respondsToSelector:@selector(_webView)]) {

#if ENABLE(DASHBOARD_SUPPORT)

        WebView *wv = [docView _webView];

        if ([wv _dashboardBehavior:WebDashboardBehaviorAllowWheelScrolling]) {

            [super scrollWheel:event];

        }

#endif

        return;

    }

    [super scrollWheel:event];

}

@end