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 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 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 "RenderFrameBase.h" 28 29#include "Frame.h" 30#include "FrameView.h" 31#include "HTMLFrameElementBase.h" 32#include "RenderView.h" 33 34namespace WebCore { 35 36RenderFrameBase::RenderFrameBase(HTMLFrameElementBase& element, PassRef<RenderStyle> style) 37 : RenderWidget(element, WTF::move(style)) 38{ 39} 40 41inline bool shouldExpandFrame(LayoutUnit width, LayoutUnit height, bool hasFixedWidth, bool hasFixedHeight) 42{ 43 // If the size computed to zero never expand. 44 if (!width || !height) 45 return false; 46 // Really small fixed size frames can't be meant to be scrolled and are there probably by mistake. Avoid expanding. 47 static unsigned smallestUsefullyScrollableDimension = 8; 48 if (hasFixedWidth && width < LayoutUnit(smallestUsefullyScrollableDimension)) 49 return false; 50 if (hasFixedHeight && height < LayoutUnit(smallestUsefullyScrollableDimension)) 51 return false; 52 return true; 53} 54 55void RenderFrameBase::layoutWithFlattening(bool hasFixedWidth, bool hasFixedHeight) 56{ 57 FrameView* childFrameView = childView(); 58 RenderView* childRoot = childFrameView ? childFrameView->frame().contentRenderer() : 0; 59 60 if (!childRoot || !shouldExpandFrame(width(), height(), hasFixedWidth, hasFixedHeight)) { 61 updateWidgetPosition(); 62 if (childFrameView) 63 childFrameView->layout(); 64 clearNeedsLayout(); 65 return; 66 } 67 68 // need to update to calculate min/max correctly 69 updateWidgetPosition(); 70 71 // if scrollbars are off, and the width or height are fixed 72 // we obey them and do not expand. With frame flattening 73 // no subframe much ever become scrollable. 74 75 bool isScrollable = frameOwnerElement().scrollingMode() != ScrollbarAlwaysOff; 76 77 // consider iframe inset border 78 int hBorder = borderLeft() + borderRight(); 79 int vBorder = borderTop() + borderBottom(); 80 81 // make sure minimum preferred width is enforced 82 if (isScrollable || !hasFixedWidth) { 83 setWidth(std::max(width(), childRoot->minPreferredLogicalWidth() + hBorder)); 84 // update again to pass the new width to the child frame 85 updateWidgetPosition(); 86 childFrameView->layout(); 87 } 88 89 // expand the frame by setting frame height = content height 90 if (isScrollable || !hasFixedHeight || childRoot->isFrameSet()) 91 setHeight(std::max<LayoutUnit>(height(), childFrameView->contentsHeight() + vBorder)); 92 if (isScrollable || !hasFixedWidth || childRoot->isFrameSet()) 93 setWidth(std::max<LayoutUnit>(width(), childFrameView->contentsWidth() + hBorder)); 94 95 updateWidgetPosition(); 96 97 ASSERT(!childFrameView->layoutPending()); 98 ASSERT(!childRoot->needsLayout()); 99 ASSERT(!childRoot->firstChild() || !childRoot->firstChild()->firstChildSlow() || !childRoot->firstChild()->firstChildSlow()->needsLayout()); 100 101 clearNeedsLayout(); 102} 103 104} 105