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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/frame/Frame.h"
     32 #include "core/frame/FrameView.h"
     33 #include "core/rendering/LayoutRectRecorder.h"
     34 #include "core/rendering/RenderView.h"
     35 
     36 namespace WebCore {
     37 
     38 using namespace HTMLNames;
     39 
     40 RenderIFrame::RenderIFrame(Element* element)
     41     : RenderPart(element)
     42 {
     43 }
     44 
     45 bool RenderIFrame::shouldComputeSizeAsReplaced() const
     46 {
     47     // When we're seamless, we use normal block/box sizing code except when inline.
     48     return !isSeamless();
     49 }
     50 
     51 bool RenderIFrame::isInlineBlockOrInlineTable() const
     52 {
     53     return isSeamless() && isInline();
     54 }
     55 
     56 LayoutUnit RenderIFrame::minPreferredLogicalWidth() const
     57 {
     58     if (!isSeamless())
     59         return RenderPart::minPreferredLogicalWidth();
     60 
     61     RenderView* childRoot = contentRootRenderer();
     62     if (!childRoot)
     63         return 0;
     64 
     65     return childRoot->minPreferredLogicalWidth() + borderAndPaddingLogicalWidth();
     66 }
     67 
     68 LayoutUnit RenderIFrame::maxPreferredLogicalWidth() const
     69 {
     70     if (!isSeamless())
     71         return RenderPart::maxPreferredLogicalWidth();
     72 
     73     RenderView* childRoot = contentRootRenderer();
     74     if (!childRoot)
     75         return 0;
     76 
     77     return childRoot->maxPreferredLogicalWidth() + borderAndPaddingLogicalWidth();
     78 }
     79 
     80 bool RenderIFrame::isSeamless() const
     81 {
     82     return node() && node()->hasTagName(iframeTag) && toHTMLIFrameElement(node())->shouldDisplaySeamlessly();
     83 }
     84 
     85 bool RenderIFrame::requiresLayer() const
     86 {
     87     return RenderPart::requiresLayer() || style()->resize() != RESIZE_NONE;
     88 }
     89 
     90 RenderView* RenderIFrame::contentRootRenderer() const
     91 {
     92     // FIXME: Is this always a valid cast? What about plugins?
     93     ASSERT(!widget() || widget()->isFrameView());
     94     FrameView* childFrameView = toFrameView(widget());
     95     return childFrameView ? childFrameView->frame().contentRenderer() : 0;
     96 }
     97 
     98 void RenderIFrame::layoutSeamlessly()
     99 {
    100     updateLogicalWidth();
    101     // FIXME: Containers set their height to 0 before laying out their kids (as we're doing here)
    102     // however, this causes FrameView::layout() to add vertical scrollbars, incorrectly inflating
    103     // the resulting contentHeight(). We'll need to make FrameView::layout() smarter.
    104     setLogicalHeight(0);
    105     updateWidgetPosition(); // Tell the Widget about our new width/height (it will also layout the child document).
    106 
    107     // Laying out our kids is normally responsible for adjusting our height, so we set it here.
    108     // Replaced elements normally do not respect padding, but seamless elements should: we'll add
    109     // both padding and border to the child's logical height here.
    110     FrameView* childFrameView = toFrameView(widget());
    111     if (childFrameView) // Widget should never be null during layout(), but just in case.
    112         setLogicalHeight(childFrameView->contentsHeight() + borderTop() + borderBottom() + paddingTop() + paddingBottom());
    113     updateLogicalHeight();
    114 
    115     updateWidgetPosition(); // Notify the Widget of our final height.
    116 
    117     // Assert that the child document did a complete layout.
    118     RenderView* childRoot = childFrameView ? childFrameView->frame().contentRenderer() : 0;
    119     ASSERT(!childFrameView || !childFrameView->layoutPending());
    120     ASSERT_UNUSED(childRoot, !childRoot || !childRoot->needsLayout());
    121 }
    122 
    123 void RenderIFrame::layout()
    124 {
    125     ASSERT(needsLayout());
    126 
    127     LayoutRectRecorder recorder(*this);
    128     if (isSeamless()) {
    129         layoutSeamlessly();
    130         // Do not return so as to share the layer and overflow updates below.
    131     } else {
    132         updateLogicalWidth();
    133         // No kids to layout as a replaced element.
    134         updateLogicalHeight();
    135     }
    136 
    137     m_overflow.clear();
    138     addVisualEffectOverflow();
    139     updateLayerTransform();
    140 
    141     clearNeedsLayout();
    142 }
    143 
    144 }
    145