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 "RenderIFrame.h"
28
29#include "FrameView.h"
30#include "HTMLNames.h"
31#include "HTMLIFrameElement.h"
32#include "RenderView.h"
33#include "Settings.h"
34
35namespace WebCore {
36
37using namespace HTMLNames;
38
39RenderIFrame::RenderIFrame(Element* element)
40    : RenderFrameBase(element)
41{
42}
43
44void RenderIFrame::computeLogicalHeight()
45{
46    RenderPart::computeLogicalHeight();
47    if (!flattenFrame())
48         return;
49
50    HTMLIFrameElement* frame = static_cast<HTMLIFrameElement*>(node());
51    bool isScrollable = frame->scrollingMode() != ScrollbarAlwaysOff;
52
53    if (isScrollable || !style()->height().isFixed()) {
54        FrameView* view = static_cast<FrameView*>(widget());
55        if (!view)
56            return;
57        int border = borderTop() + borderBottom();
58        setHeight(max(height(), view->contentsHeight() + border));
59    }
60}
61
62void RenderIFrame::computeLogicalWidth()
63{
64    RenderPart::computeLogicalWidth();
65    if (!flattenFrame())
66        return;
67
68    HTMLIFrameElement* frame = static_cast<HTMLIFrameElement*>(node());
69    bool isScrollable = frame->scrollingMode() != ScrollbarAlwaysOff;
70
71    if (isScrollable || !style()->width().isFixed()) {
72        FrameView* view = static_cast<FrameView*>(widget());
73        if (!view)
74            return;
75        int border = borderLeft() + borderRight();
76        setWidth(max(width(), view->contentsWidth() + border));
77    }
78}
79
80bool RenderIFrame::flattenFrame()
81{
82    if (!node() || !node()->hasTagName(iframeTag))
83        return false;
84
85    HTMLIFrameElement* element = static_cast<HTMLIFrameElement*>(node());
86    bool isScrollable = element->scrollingMode() != ScrollbarAlwaysOff;
87
88    if (!isScrollable && style()->width().isFixed()
89        && style()->height().isFixed())
90        return false;
91
92    Frame* frame = element->document()->frame();
93    bool enabled = frame && frame->settings()->frameFlatteningEnabled();
94
95    if (!enabled || !frame->page())
96        return false;
97
98    FrameView* view = frame->page()->mainFrame()->view();
99    if (!view)
100        return false;
101
102    // Do not flatten offscreen inner frames during frame flattening.
103    return absoluteBoundingBoxRect().intersects(IntRect(IntPoint(0, 0), view->contentsSize()));
104}
105
106void RenderIFrame::layout()
107{
108    ASSERT(needsLayout());
109
110    RenderPart::computeLogicalWidth();
111    RenderPart::computeLogicalHeight();
112
113    if (flattenFrame()) {
114        layoutWithFlattening(style()->width().isFixed(), style()->height().isFixed());
115        return;
116    }
117
118    RenderPart::layout();
119
120    m_overflow.clear();
121    addShadowOverflow();
122    updateLayerTransform();
123
124    setNeedsLayout(false);
125}
126
127}
128