1 /*

     2  * Copyright (C) 2005 Apple Computer, Inc.  All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  *

     8  * 1.  Redistributions of source code must retain the above copyright

     9  *     notice, this list of conditions and the following disclaimer. 

    10  * 2.  Redistributions in binary form must reproduce the above copyright

    11  *     notice, this list of conditions and the following disclaimer in the

    12  *     documentation and/or other materials provided with the distribution. 

    13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

    14  *     its contributors may be used to endorse or promote products derived

    15  *     from this software without specific prior written permission. 

    16  *

    17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

    18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

    19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

    20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

    21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

    24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

    26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    27  */

    28 

    29 #import "WebClipView.h"

    30 

    31 #import <JavaScriptCore/Assertions.h>

    32 #import <WebKit/WebHTMLView.h>

    33 #import <WebKit/WebNSViewExtras.h>

    34 #import <WebKit/WebViewPrivate.h>

    35 

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

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

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

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

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

    41 

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

    43 

    44 @interface NSView (WebViewMethod)

    45 - (WebView *)_webView;

    46 @end

    47 

    48 @implementation WebClipView

    49 

    50 - (id)initWithFrame:(NSRect)frame

    51 {

    52     self = [super initWithFrame:frame];

    53     if (!self)

    54         return nil;

    55     

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

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

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

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

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

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

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

    63     // See these bugs for more information:

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

    65     [self releaseGState];

    66     

    67     return self;

    68 }

    69 

    70 - (void)resetAdditionalClip

    71 {

    72     ASSERT(_haveAdditionalClip);

    73     _haveAdditionalClip = NO;

    74 }

    75 

    76 - (void)setAdditionalClip:(NSRect)additionalClip

    77 {

    78     ASSERT(!_haveAdditionalClip);

    79     _haveAdditionalClip = YES;

    80     _additionalClip = additionalClip;

    81 }

    82 

    83 - (BOOL)hasAdditionalClip

    84 {

    85     return _haveAdditionalClip;

    86 }

    87 

    88 - (NSRect)additionalClip

    89 {

    90     ASSERT(_haveAdditionalClip);

    91     return _additionalClip;

    92 }

    93 

    94 - (NSRect)_focusRingVisibleRect

    95 {

    96     NSRect rect = [self visibleRect];

    97     if (_haveAdditionalClip) {

    98         rect = NSIntersectionRect(rect, _additionalClip);

    99     }

   100     return rect;

   101 }

   102 

   103 - (void)scrollWheel:(NSEvent *)event

   104 {

   105     NSView *docView = [self documentView];

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

   107         WebView *wv = [docView _webView];

   108         if ([wv _dashboardBehavior:WebDashboardBehaviorAllowWheelScrolling]) {

   109             [super scrollWheel:event];

   110         }

   111         return;

   112     }

   113     [super scrollWheel:event];

   114 }

   115 

   116 @end