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#include "ScriptDisallowedScope.h"
34#include <wtf/IsoMallocInlines.h>
35
36namespace WebCore {
37
38WTF_MAKE_ISO_ALLOCATED_IMPL(RenderFrameBase);
39
40RenderFrameBase::RenderFrameBase(HTMLFrameElementBase& element, RenderStyle&& style)
41 : RenderWidget(element, WTFMove(style))
42{
43}
44
45inline bool shouldExpandFrame(LayoutUnit width, LayoutUnit height, bool hasFixedWidth, bool hasFixedHeight)
46{
47 // If the size computed to zero never expand.
48 if (!width || !height)
49 return false;
50 // Really small fixed size frames can't be meant to be scrolled and are there probably by mistake. Avoid expanding.
51 static const unsigned smallestUsefullyScrollableDimension = 8;
52 if (hasFixedWidth && width < LayoutUnit(smallestUsefullyScrollableDimension))
53 return false;
54 if (hasFixedHeight && height < LayoutUnit(smallestUsefullyScrollableDimension))
55 return false;
56 return true;
57}
58
59void RenderFrameBase::layoutWithFlattening(bool hasFixedWidth, bool hasFixedHeight)
60{
61 view().protectRenderWidgetUntilLayoutIsDone(*this);
62
63 performLayoutWithFlattening(hasFixedWidth, hasFixedHeight);
64
65 clearNeedsLayout();
66}
67
68RenderView* RenderFrameBase::childRenderView() const
69{
70 if (!childView())
71 return nullptr;
72 return childView()->renderView();
73}
74
75void RenderFrameBase::performLayoutWithFlattening(bool hasFixedWidth, bool hasFixedHeight)
76{
77 // FIXME: Refactor frame flattening code so that we don't need to disable assertions here.
78 ScriptDisallowedScope::DisableAssertionsInScope scope;
79 if (!childRenderView())
80 return;
81
82 if (!shouldExpandFrame(width(), height(), hasFixedWidth, hasFixedHeight)) {
83 if (updateWidgetPosition() == ChildWidgetState::Destroyed)
84 return;
85 childView()->layoutContext().layout();
86 return;
87 }
88
89 // need to update to calculate min/max correctly
90 if (updateWidgetPosition() == ChildWidgetState::Destroyed)
91 return;
92
93 // if scrollbars are off, and the width or height are fixed
94 // we obey them and do not expand. With frame flattening
95 // no subframe much ever become scrollable.
96 bool isScrollable = frameOwnerElement().scrollingMode() != ScrollbarAlwaysOff;
97
98 // consider iframe inset border
99 int hBorder = borderLeft() + borderRight();
100 int vBorder = borderTop() + borderBottom();
101
102 // make sure minimum preferred width is enforced
103 if (isScrollable || !hasFixedWidth) {
104 ASSERT(childRenderView());
105 setWidth(std::max(width(), childRenderView()->minPreferredLogicalWidth() + hBorder));
106 // update again to pass the new width to the child frame
107 if (updateWidgetPosition() == ChildWidgetState::Destroyed)
108 return;
109 childView()->layoutContext().layout();
110 }
111
112 ASSERT(childView());
113 // expand the frame by setting frame height = content height
114 if (isScrollable || !hasFixedHeight || childRenderView()->isFrameSet())
115 setHeight(std::max<LayoutUnit>(height(), childView()->contentsHeight() + vBorder));
116 if (isScrollable || !hasFixedWidth || childRenderView()->isFrameSet())
117 setWidth(std::max<LayoutUnit>(width(), childView()->contentsWidth() + hBorder));
118
119 if (updateWidgetPosition() == ChildWidgetState::Destroyed)
120 return;
121
122 ASSERT(!childView()->layoutContext().isLayoutPending());
123 ASSERT(!childRenderView()->needsLayout());
124 ASSERT(!childRenderView()->firstChild() || !childRenderView()->firstChild()->firstChildSlow() || !childRenderView()->firstChild()->firstChildSlow()->needsLayout());
125}
126
127}
128