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      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 "core/rendering/RenderIFrame.h"
     28 
     29 #include "HTMLNames.h"
     30 #include "core/html/HTMLIFrameElement.h"
     31 #include "core/page/Frame.h"
     32 #include "core/page/FrameView.h"
     33 #include "core/rendering/RenderView.h"
     34 
     35 namespace WebCore {
     36 
     37 using namespace HTMLNames;
     38 
     39 RenderIFrame::RenderIFrame(Element* element)
     40     : RenderPart(element)
     41 {
     42 }
     43 
     44 bool RenderIFrame::shouldComputeSizeAsReplaced() const
     45 {
     46     // When we're seamless, we use normal block/box sizing code except when inline.
     47     return !isSeamless();
     48 }
     49 
     50 bool RenderIFrame::isInlineBlockOrInlineTable() const
     51 {
     52     return isSeamless() && isInline();
     53 }
     54 
     55 LayoutUnit RenderIFrame::minPreferredLogicalWidth() const
     56 {
     57     if (!isSeamless())
     58         return RenderPart::minPreferredLogicalWidth();
     59 
     60     RenderView* childRoot = contentRootRenderer();
     61     if (!childRoot)
     62         return 0;
     63 
     64     return childRoot->minPreferredLogicalWidth() + borderAndPaddingLogicalWidth();
     65 }
     66 
     67 LayoutUnit RenderIFrame::maxPreferredLogicalWidth() const
     68 {
     69     if (!isSeamless())
     70         return RenderPart::maxPreferredLogicalWidth();
     71 
     72     RenderView* childRoot = contentRootRenderer();
     73     if (!childRoot)
     74         return 0;
     75 
     76     return childRoot->maxPreferredLogicalWidth() + borderAndPaddingLogicalWidth();
     77 }
     78 
     79 bool RenderIFrame::isSeamless() const
     80 {
     81     return node() && node()->hasTagName(iframeTag) && toHTMLIFrameElement(node())->shouldDisplaySeamlessly();
     82 }
     83 
     84 bool RenderIFrame::requiresLayer() const
     85 {
     86     return RenderPart::requiresLayer() || style()->resize() != RESIZE_NONE;
     87 }
     88 
     89 RenderView* RenderIFrame::contentRootRenderer() const
     90 {
     91     // FIXME: Is this always a valid cast? What about plugins?
     92     ASSERT(!widget() || widget()->isFrameView());
     93     FrameView* childFrameView = toFrameView(widget());
     94     return childFrameView ? childFrameView->frame()->contentRenderer() : 0;
     95 }
     96 
     97 void RenderIFrame::layoutSeamlessly()
     98 {
     99     updateLogicalWidth();
    100     // FIXME: Containers set their height to 0 before laying out their kids (as we're doing here)
    101     // however, this causes FrameView::layout() to add vertical scrollbars, incorrectly inflating
    102     // the resulting contentHeight(). We'll need to make FrameView::layout() smarter.
    103     setLogicalHeight(0);
    104     updateWidgetPosition(); // Tell the Widget about our new width/height (it will also layout the child document).
    105 
    106     // Laying out our kids is normally responsible for adjusting our height, so we set it here.
    107     // Replaced elements normally do not respect padding, but seamless elements should: we'll add
    108     // both padding and border to the child's logical height here.
    109     FrameView* childFrameView = toFrameView(widget());
    110     if (childFrameView) // Widget should never be null during layout(), but just in case.
    111         setLogicalHeight(childFrameView->contentsHeight() + borderTop() + borderBottom() + paddingTop() + paddingBottom());
    112     updateLogicalHeight();
    113 
    114     updateWidgetPosition(); // Notify the Widget of our final height.
    115 
    116     // Assert that the child document did a complete layout.
    117     RenderView* childRoot = childFrameView ? childFrameView->frame()->contentRenderer() : 0;
    118     ASSERT(!childFrameView || !childFrameView->layoutPending());
    119     ASSERT_UNUSED(childRoot, !childRoot || !childRoot->needsLayout());
    120 }
    121 
    122 void RenderIFrame::layout()
    123 {
    124     StackStats::LayoutCheckPoint layoutCheckPoint;
    125     ASSERT(needsLayout());
    126 
    127     if (isSeamless()) {
    128         layoutSeamlessly();
    129         // Do not return so as to share the layer and overflow updates below.
    130     } else {
    131         updateLogicalWidth();
    132         // No kids to layout as a replaced element.
    133         updateLogicalHeight();
    134     }
    135 
    136     m_overflow.clear();
    137     addVisualEffectOverflow();
    138     updateLayerTransform();
    139 
    140     clearNeedsLayout();
    141 }
    142 
    143 }
    144