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/*
* Copyright (C) 2010 Apple 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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.
*/
#include "config.h"
#include "RenderFrameBase.h"
#include "Frame.h"
#include "FrameView.h"
#include "HTMLFrameElementBase.h"
#include "RenderView.h"
namespace WebCore {
RenderFrameBase::RenderFrameBase(HTMLFrameElementBase& element, PassRef<RenderStyle> style)
: RenderWidget(element, WTF::move(style))
{
}
inline bool shouldExpandFrame(LayoutUnit width, LayoutUnit height, bool hasFixedWidth, bool hasFixedHeight)
{
// If the size computed to zero never expand.
if (!width || !height)
return false;
// Really small fixed size frames can't be meant to be scrolled and are there probably by mistake. Avoid expanding.
static unsigned smallestUsefullyScrollableDimension = 8;
if (hasFixedWidth && width < LayoutUnit(smallestUsefullyScrollableDimension))
return false;
if (hasFixedHeight && height < LayoutUnit(smallestUsefullyScrollableDimension))
return false;
return true;
}
void RenderFrameBase::layoutWithFlattening(bool hasFixedWidth, bool hasFixedHeight)
{
FrameView* childFrameView = childView();
RenderView* childRoot = childFrameView ? childFrameView->frame().contentRenderer() : 0;
if (!childRoot || !shouldExpandFrame(width(), height(), hasFixedWidth, hasFixedHeight)) {
updateWidgetPosition();
if (childFrameView)
childFrameView->layout();
clearNeedsLayout();
return;
}
// need to update to calculate min/max correctly
updateWidgetPosition();
// if scrollbars are off, and the width or height are fixed
// we obey them and do not expand. With frame flattening
// no subframe much ever become scrollable.
bool isScrollable = frameOwnerElement().scrollingMode() != ScrollbarAlwaysOff;
// consider iframe inset border
int hBorder = borderLeft() + borderRight();
int vBorder = borderTop() + borderBottom();
// make sure minimum preferred width is enforced
if (isScrollable || !hasFixedWidth) {
setWidth(std::max(width(), childRoot->minPreferredLogicalWidth() + hBorder));
// update again to pass the new width to the child frame
updateWidgetPosition();
childFrameView->layout();
}
// expand the frame by setting frame height = content height
if (isScrollable || !hasFixedHeight || childRoot->isFrameSet())
setHeight(std::max<LayoutUnit>(height(), childFrameView->contentsHeight() + vBorder));
if (isScrollable || !hasFixedWidth || childRoot->isFrameSet())
setWidth(std::max<LayoutUnit>(width(), childFrameView->contentsWidth() + hBorder));
updateWidgetPosition();
ASSERT(!childFrameView->layoutPending());
ASSERT(!childRoot->needsLayout());
ASSERT(!childRoot->firstChild() || !childRoot->firstChild()->firstChildSlow() || !childRoot->firstChild()->firstChildSlow()->needsLayout());
clearNeedsLayout();
}
}
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