128 lines
4.9 KiB
C++
128 lines
4.9 KiB
C++
/*
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* Copyright (C) 2010 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "RenderFrameBase.h"
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#include "Frame.h"
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#include "FrameView.h"
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#include "HTMLFrameElementBase.h"
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#include "RenderView.h"
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#include "ScriptDisallowedScope.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(RenderFrameBase);
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RenderFrameBase::RenderFrameBase(HTMLFrameElementBase& element, RenderStyle&& style)
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: RenderWidget(element, WTFMove(style))
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{
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}
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inline bool shouldExpandFrame(LayoutUnit width, LayoutUnit height, bool hasFixedWidth, bool hasFixedHeight)
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{
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// If the size computed to zero never expand.
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if (!width || !height)
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return false;
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// Really small fixed size frames can't be meant to be scrolled and are there probably by mistake. Avoid expanding.
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static const unsigned smallestUsefullyScrollableDimension = 8;
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if (hasFixedWidth && width < LayoutUnit(smallestUsefullyScrollableDimension))
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return false;
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if (hasFixedHeight && height < LayoutUnit(smallestUsefullyScrollableDimension))
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return false;
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return true;
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}
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void RenderFrameBase::layoutWithFlattening(bool hasFixedWidth, bool hasFixedHeight)
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{
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view().protectRenderWidgetUntilLayoutIsDone(*this);
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performLayoutWithFlattening(hasFixedWidth, hasFixedHeight);
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clearNeedsLayout();
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}
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RenderView* RenderFrameBase::childRenderView() const
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{
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if (!childView())
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return nullptr;
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return childView()->renderView();
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}
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void RenderFrameBase::performLayoutWithFlattening(bool hasFixedWidth, bool hasFixedHeight)
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{
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// FIXME: Refactor frame flattening code so that we don't need to disable assertions here.
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ScriptDisallowedScope::DisableAssertionsInScope scope;
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if (!childRenderView())
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return;
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if (!shouldExpandFrame(width(), height(), hasFixedWidth, hasFixedHeight)) {
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if (updateWidgetPosition() == ChildWidgetState::Destroyed)
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return;
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childView()->layoutContext().layout();
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return;
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}
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// need to update to calculate min/max correctly
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if (updateWidgetPosition() == ChildWidgetState::Destroyed)
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return;
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// if scrollbars are off, and the width or height are fixed
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// we obey them and do not expand. With frame flattening
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// no subframe much ever become scrollable.
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bool isScrollable = frameOwnerElement().scrollingMode() != ScrollbarAlwaysOff;
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// consider iframe inset border
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int hBorder = borderLeft() + borderRight();
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int vBorder = borderTop() + borderBottom();
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// make sure minimum preferred width is enforced
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if (isScrollable || !hasFixedWidth) {
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ASSERT(childRenderView());
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setWidth(std::max(width(), childRenderView()->minPreferredLogicalWidth() + hBorder));
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// update again to pass the new width to the child frame
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if (updateWidgetPosition() == ChildWidgetState::Destroyed)
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return;
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childView()->layoutContext().layout();
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}
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ASSERT(childView());
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// expand the frame by setting frame height = content height
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if (isScrollable || !hasFixedHeight || childRenderView()->isFrameSet())
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setHeight(std::max<LayoutUnit>(height(), childView()->contentsHeight() + vBorder));
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if (isScrollable || !hasFixedWidth || childRenderView()->isFrameSet())
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setWidth(std::max<LayoutUnit>(width(), childView()->contentsWidth() + hBorder));
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if (updateWidgetPosition() == ChildWidgetState::Destroyed)
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return;
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ASSERT(!childView()->layoutContext().isLayoutPending());
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ASSERT(!childRenderView()->needsLayout());
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ASSERT(!childRenderView()->firstChild() || !childRenderView()->firstChild()->firstChildSlow() || !childRenderView()->firstChild()->firstChildSlow()->needsLayout());
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}
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}
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