1/*
2 * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
3 * Copyright (C) 2013 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "platform/Widget.h"
29
30
31#include "wtf/Assertions.h"
32
33namespace blink {
34
35Widget::Widget()
36    : m_parent(0)
37    , m_selfVisible(false)
38    , m_parentVisible(false)
39{
40}
41
42Widget::~Widget()
43{
44    ASSERT(!parent());
45}
46
47void Widget::setParent(Widget* widget)
48{
49    ASSERT(!widget || !m_parent);
50    if (!widget || !widget->isVisible())
51        setParentVisible(false);
52    m_parent = widget;
53    if (widget && widget->isVisible())
54        setParentVisible(true);
55}
56
57Widget* Widget::root() const
58{
59    const Widget* top = this;
60    while (top->parent())
61        top = top->parent();
62    if (top->isFrameView())
63        return const_cast<Widget*>(static_cast<const Widget*>(top));
64    return 0;
65}
66
67IntRect Widget::convertFromContainingWindow(const IntRect& windowRect) const
68{
69    if (const Widget* parentWidget = parent()) {
70        IntRect parentRect = parentWidget->convertFromContainingWindow(windowRect);
71        return convertFromContainingView(parentRect);
72    }
73    return windowRect;
74}
75
76IntRect Widget::convertToContainingWindow(const IntRect& localRect) const
77{
78    if (const Widget* parentWidget = parent()) {
79        IntRect parentRect = convertToContainingView(localRect);
80        return parentWidget->convertToContainingWindow(parentRect);
81    }
82    return localRect;
83}
84
85IntPoint Widget::convertFromContainingWindow(const IntPoint& windowPoint) const
86{
87    if (const Widget* parentWidget = parent()) {
88        IntPoint parentPoint = parentWidget->convertFromContainingWindow(windowPoint);
89        return convertFromContainingView(parentPoint);
90    }
91    return windowPoint;
92}
93
94FloatPoint Widget::convertFromContainingWindow(const FloatPoint& windowPoint) const
95{
96    // Widgets / windows are required to be IntPoint aligned, but we may need to convert
97    // FloatPoint values within them (eg. for event co-ordinates).
98    IntPoint flooredPoint = flooredIntPoint(windowPoint);
99    FloatPoint parentPoint = this->convertFromContainingWindow(flooredPoint);
100    FloatSize windowFraction = windowPoint - flooredPoint;
101    // Use linear interpolation handle any fractional value (eg. for iframes subject to a transform
102    // beyond just a simple translation).
103    // FIXME: Add FloatPoint variants of all co-ordinate space conversion APIs.
104    if (!windowFraction.isEmpty()) {
105        const int kFactor = 1000;
106        IntPoint parentLineEnd = this->convertFromContainingWindow(flooredPoint + roundedIntSize(windowFraction.scaledBy(kFactor)));
107        FloatSize parentFraction = (parentLineEnd - parentPoint).scaledBy(1.0f / kFactor);
108        parentPoint.move(parentFraction);
109    }
110    return parentPoint;
111}
112
113IntPoint Widget::convertToContainingWindow(const IntPoint& localPoint) const
114{
115    if (const Widget* parentWidget = parent()) {
116        IntPoint parentPoint = convertToContainingView(localPoint);
117        return parentWidget->convertToContainingWindow(parentPoint);
118    }
119    return localPoint;
120}
121
122IntRect Widget::convertToContainingView(const IntRect& localRect) const
123{
124    if (const Widget* parentWidget = parent()) {
125        IntRect parentRect(localRect);
126        parentRect.setLocation(parentWidget->convertChildToSelf(this, localRect.location()));
127        return parentRect;
128    }
129    return localRect;
130}
131
132IntRect Widget::convertFromContainingView(const IntRect& parentRect) const
133{
134    if (const Widget* parentWidget = parent()) {
135        IntRect localRect = parentRect;
136        localRect.setLocation(parentWidget->convertSelfToChild(this, localRect.location()));
137        return localRect;
138    }
139
140    return parentRect;
141}
142
143IntPoint Widget::convertToContainingView(const IntPoint& localPoint) const
144{
145    if (const Widget* parentWidget = parent())
146        return parentWidget->convertChildToSelf(this, localPoint);
147
148    return localPoint;
149}
150
151IntPoint Widget::convertFromContainingView(const IntPoint& parentPoint) const
152{
153    if (const Widget* parentWidget = parent())
154        return parentWidget->convertSelfToChild(this, parentPoint);
155
156    return parentPoint;
157}
158
159IntPoint Widget::convertChildToSelf(const Widget*, const IntPoint& point) const
160{
161    return point;
162}
163
164IntPoint Widget::convertSelfToChild(const Widget*, const IntPoint& point) const
165{
166    return point;
167}
168
169} // namespace blink
170