1 /*

     2  * Copyright (C) 2010 Apple 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  * 1. Redistributions of source code must retain the above copyright

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

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

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

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

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

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

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

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

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

    24  */

    25 

    26 #include "config.h"

    27 #include "RenderIFrame.h"

    28 

    29 #include "FrameView.h"

    30 #include "HTMLNames.h"

    31 #include "HTMLIFrameElement.h"

    32 #include "RenderView.h"

    33 #include "Settings.h"

    34 

    35 namespace WebCore {

    36 

    37 using namespace HTMLNames;

    38     

    39 RenderIFrame::RenderIFrame(Element* element)

    40     : RenderFrameBase(element)

    41 {

    42 }

    43 

    44 void RenderIFrame::calcHeight()

    45 {

    46     RenderPart::calcHeight();

    47     if (!flattenFrame())

    48          return;

    49 

    50     HTMLIFrameElement* frame = static_cast<HTMLIFrameElement*>(node());

    51     bool isScrollable = frame->scrollingMode() != ScrollbarAlwaysOff;

    52 

    53     if (isScrollable || !style()->height().isFixed()) {

    54         FrameView* view = static_cast<FrameView*>(widget());

    55         if (!view)

    56             return;

    57         int border = borderTop() + borderBottom();

    58         setHeight(max(height(), view->contentsHeight() + border));

    59     }

    60 }

    61 

    62 void RenderIFrame::calcWidth()

    63 {

    64     RenderPart::calcWidth();

    65     if (!flattenFrame())

    66         return;

    67 

    68     HTMLIFrameElement* frame = static_cast<HTMLIFrameElement*>(node());

    69     bool isScrollable = frame->scrollingMode() != ScrollbarAlwaysOff;

    70 

    71     if (isScrollable || !style()->width().isFixed()) {

    72         FrameView* view = static_cast<FrameView*>(widget());

    73         if (!view)

    74             return;

    75         int border = borderLeft() + borderRight();

    76         setWidth(max(width(), view->contentsWidth() + border));

    77     }

    78 }

    79 

    80 bool RenderIFrame::flattenFrame()

    81 {

    82     if (!node() || !node()->hasTagName(iframeTag))

    83         return false;

    84 

    85     HTMLIFrameElement* element = static_cast<HTMLIFrameElement*>(node());

    86     bool isScrollable = element->scrollingMode() != ScrollbarAlwaysOff;

    87 

    88     if (!isScrollable && style()->width().isFixed()

    89         && style()->height().isFixed())

    90         return false;

    91 

    92     Frame* frame = element->document()->frame();

    93     bool enabled = frame && frame->settings()->frameFlatteningEnabled();

    94 

    95     if (!enabled || !frame->page())

    96         return false;

    97 

    98     FrameView* view = frame->page()->mainFrame()->view();

    99     if (!view)

   100         return false;

   101 

   102     // Do not flatten offscreen inner frames during frame flattening.

   103     return absoluteBoundingBoxRect().intersects(IntRect(IntPoint(0, 0), view->contentsSize()));

   104 }

   105 

   106 void RenderIFrame::layout()

   107 {

   108     ASSERT(needsLayout());

   109 

   110     RenderPart::calcWidth();

   111     RenderPart::calcHeight();

   112 

   113     if (flattenFrame()) {

   114         layoutWithFlattening(style()->width().isFixed(), style()->height().isFixed());

   115         return;

   116     }

   117 

   118     RenderPart::layout();

   119 

   120     m_overflow.clear();

   121     addShadowOverflow();

   122 

   123     setNeedsLayout(false);

   124 }

   125 

   126 #if USE(ACCELERATED_COMPOSITING)

   127 bool RenderIFrame::requiresLayer() const

   128 {

   129     if (RenderPart::requiresLayer())

   130         return true;

   131     

   132     return requiresAcceleratedCompositing();

   133 }

   134 

   135 bool RenderIFrame::requiresAcceleratedCompositing() const

   136 {

   137     if (!node() || !node()->hasTagName(iframeTag))

   138         return false;

   139 

   140     // If the contents of the iframe are composited, then we have to be as well.

   141     HTMLIFrameElement* element = static_cast<HTMLIFrameElement*>(node());

   142     if (Document* contentDocument = element->contentDocument()) {

   143         if (RenderView* view = contentDocument->renderView())

   144             return view->usesCompositing();

   145     }

   146 

   147     return false;

   148 }

   149 #endif

   150 

   151 }