third_party/WebKit/Source/platform/Widget.cpp

   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 #include "wtf/Assertions.h"
  31
  32 namespace blink {
  33
  34 Widget::Widget()
  35     : m_parent(nullptr)
  36     , m_selfVisible(false)
  37     , m_parentVisible(false)
  38 {
  39 }
  40
  41 Widget::~Widget()
  42 {
  43 #if !ENABLE(OILPAN)
  44     ASSERT(!parent());
  45 #endif
  46 }
  47
  48 DEFINE_TRACE(Widget)
  49 {
  50     visitor->trace(m_parent);
  51 }
  52
  53 void Widget::setParent(Widget* widget)
  54 {
  55     ASSERT(!widget || !m_parent);
  56     if (!widget || !widget->isVisible())
  57         setParentVisible(false);
  58     m_parent = widget;
  59     if (widget && widget->isVisible())
  60         setParentVisible(true);
  61 }
  62
  63 Widget* Widget::root() const
  64 {
  65     const Widget* top = this;
  66     while (top->parent())
  67         top = top->parent();
  68     if (top->isFrameView())
  69         return const_cast<Widget*>(static_cast<const Widget*>(top));
  70     return 0;
  71 }
  72
  73 IntRect Widget::convertFromContainingWindow(const IntRect& windowRect) const
  74 {
  75     if (const Widget* parentWidget = parent()) {
  76         IntRect parentRect = parentWidget->convertFromContainingWindow(windowRect);
  77         return convertFromContainingView(parentRect);
  78     }
  79     return windowRect;
  80 }
  81
  82 IntRect Widget::convertToContainingWindow(const IntRect& localRect) const
  83 {
  84     if (const Widget* parentWidget = parent()) {
  85         IntRect parentRect = convertToContainingView(localRect);
  86         return parentWidget->convertToContainingWindow(parentRect);
  87     }
  88     return localRect;
  89 }
  90
  91 IntPoint Widget::convertFromContainingWindow(const IntPoint& windowPoint) const
  92 {
  93     if (const Widget* parentWidget = parent()) {
  94         IntPoint parentPoint = parentWidget->convertFromContainingWindow(windowPoint);
  95         return convertFromContainingView(parentPoint);
  96     }
  97     return windowPoint;
  98 }
  99
 100 FloatPoint Widget::convertFromContainingWindow(const FloatPoint& windowPoint) const
 101 {
 102     // Widgets / windows are required to be IntPoint aligned, but we may need to convert
 103     // FloatPoint values within them (eg. for event co-ordinates).
 104     IntPoint flooredPoint = flooredIntPoint(windowPoint);
 105     FloatPoint parentPoint = this->convertFromContainingWindow(flooredPoint);
 106     FloatSize windowFraction = windowPoint - flooredPoint;
 107     // Use linear interpolation handle any fractional value (eg. for iframes subject to a transform
 108     // beyond just a simple translation).
 109     // FIXME: Add FloatPoint variants of all co-ordinate space conversion APIs.
 110     if (!windowFraction.isEmpty()) {
 111         const int kFactor = 1000;
 112         IntPoint parentLineEnd = this->convertFromContainingWindow(flooredPoint + roundedIntSize(windowFraction.scaledBy(kFactor)));
 113         FloatSize parentFraction = (parentLineEnd - parentPoint).scaledBy(1.0f / kFactor);
 114         parentPoint.move(parentFraction);
 115     }
 116     return parentPoint;
 117 }
 118
 119 IntPoint Widget::convertToContainingWindow(const IntPoint& localPoint) const
 120 {
 121     if (const Widget* parentWidget = parent()) {
 122         IntPoint parentPoint = convertToContainingView(localPoint);
 123         return parentWidget->convertToContainingWindow(parentPoint);
 124     }
 125     return localPoint;
 126 }
 127
 128 IntRect Widget::convertToContainingView(const IntRect& localRect) const
 129 {
 130     if (const Widget* parentWidget = parent()) {
 131         IntRect parentRect(localRect);
 132         parentRect.setLocation(parentWidget->convertChildToSelf(this, localRect.location()));
 133         return parentRect;
 134     }
 135     return localRect;
 136 }
 137
 138 IntRect Widget::convertFromContainingView(const IntRect& parentRect) const
 139 {
 140     if (const Widget* parentWidget = parent()) {
 141         IntRect localRect = parentRect;
 142         localRect.setLocation(parentWidget->convertSelfToChild(this, localRect.location()));
 143         return localRect;
 144     }
 145
 146     return parentRect;
 147 }
 148
 149 IntPoint Widget::convertToContainingView(const IntPoint& localPoint) const
 150 {
 151     if (const Widget* parentWidget = parent())
 152         return parentWidget->convertChildToSelf(this, localPoint);
 153
 154     return localPoint;
 155 }
 156
 157 IntPoint Widget::convertFromContainingView(const IntPoint& parentPoint) const
 158 {
 159     if (const Widget* parentWidget = parent())
 160         return parentWidget->convertSelfToChild(this, parentPoint);
 161
 162     return parentPoint;
 163 }
 164
 165 IntPoint Widget::convertChildToSelf(const Widget*, const IntPoint& point) const
 166 {
 167     return point;
 168 }
 169
 170 IntPoint Widget::convertSelfToChild(const Widget*, const IntPoint& point) const
 171 {
 172     return point;
 173 }
 174
 175 } // namespace blink