third_party/WebKit/Source/core/events/MouseRelatedEvent.cpp

   1 /*
   2  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
   3  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
   4  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
   5  * Copyright (C) 2003, 2005, 2006, 2008 Apple Inc. All rights reserved.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public License
  18  * along with this library; see the file COPYING.LIB.  If not, write to
  19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20  * Boston, MA 02110-1301, USA.
  21  */
  22
  23 #include "config.h"
  24 #include "core/events/MouseRelatedEvent.h"
  25
  26 #include "core/dom/Document.h"
  27 #include "core/frame/LocalDOMWindow.h"
  28 #include "core/frame/FrameView.h"
  29 #include "core/frame/LocalFrame.h"
  30 #include "core/layout/LayoutObject.h"
  31 #include "core/paint/DeprecatedPaintLayer.h"
  32
  33 namespace blink {
  34
  35 MouseRelatedEvent::MouseRelatedEvent()
  36     : m_positionType(PositionType::Position)
  37     , m_hasCachedRelativePosition(false)
  38 {
  39 }
  40
  41 static LayoutSize contentsScrollOffset(AbstractView* abstractView)
  42 {
  43     if (!abstractView || !abstractView->isLocalDOMWindow())
  44         return LayoutSize();
  45     LocalFrame* frame = toLocalDOMWindow(abstractView)->frame();
  46     if (!frame)
  47         return LayoutSize();
  48     FrameView* frameView = frame->view();
  49     if (!frameView)
  50         return LayoutSize();
  51     float scaleFactor = frame->pageZoomFactor();
  52     return LayoutSize(frameView->scrollX() / scaleFactor, frameView->scrollY() / scaleFactor);
  53 }
  54
  55 MouseRelatedEvent::MouseRelatedEvent(const AtomicString& eventType, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView> abstractView,
  56     int detail, const IntPoint& screenLocation, const IntPoint& rootFrameLocation,
  57     const IntPoint& movementDelta,
  58     bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, PositionType positionType, InputDeviceCapabilities* sourceCapabilities)
  59     : UIEventWithKeyState(eventType, canBubble, cancelable, abstractView, detail, ctrlKey, altKey, shiftKey, metaKey, sourceCapabilities)
  60     , m_screenLocation(screenLocation)
  61     , m_movementDelta(movementDelta)
  62     , m_positionType(positionType)
  63 {
  64     LayoutPoint adjustedPageLocation;
  65     LayoutPoint scrollPosition;
  66
  67     LocalFrame* frame = view() && view()->isLocalDOMWindow() ? toLocalDOMWindow(view())->frame() : nullptr;
  68     if (frame && hasPosition()) {
  69         if (FrameView* frameView = frame->view()) {
  70             scrollPosition = frameView->scrollPosition();
  71             adjustedPageLocation = frameView->rootFrameToContents(rootFrameLocation);
  72             float scaleFactor = 1 / frame->pageZoomFactor();
  73             if (scaleFactor != 1.0f) {
  74                 adjustedPageLocation.scale(scaleFactor, scaleFactor);
  75                 scrollPosition.scale(scaleFactor, scaleFactor);
  76             }
  77         }
  78     }
  79
  80     m_clientLocation = adjustedPageLocation - toLayoutSize(scrollPosition);
  81     m_pageLocation = adjustedPageLocation;
  82
  83     initCoordinates();
  84 }
  85
  86 void MouseRelatedEvent::initCoordinates()
  87 {
  88     // Set up initial values for coordinates.
  89     // Correct values are computed lazily, see computeRelativePosition.
  90     m_layerLocation = m_pageLocation;
  91     m_offsetLocation = m_pageLocation;
  92
  93     computePageLocation();
  94     m_hasCachedRelativePosition = false;
  95 }
  96
  97 void MouseRelatedEvent::initCoordinates(const LayoutPoint& clientLocation)
  98 {
  99     // Set up initial values for coordinates.
 100     // Correct values are computed lazily, see computeRelativePosition.
 101     m_clientLocation = clientLocation;
 102     m_pageLocation = clientLocation + contentsScrollOffset(view());
 103
 104     m_layerLocation = m_pageLocation;
 105     m_offsetLocation = m_pageLocation;
 106
 107     computePageLocation();
 108     m_hasCachedRelativePosition = false;
 109 }
 110
 111 static float pageZoomFactor(const UIEvent* event)
 112 {
 113     if (!event->view() || !event->view()->isLocalDOMWindow())
 114         return 1;
 115     LocalFrame* frame = toLocalDOMWindow(event->view())->frame();
 116     if (!frame)
 117         return 1;
 118     return frame->pageZoomFactor();
 119 }
 120
 121 void MouseRelatedEvent::computePageLocation()
 122 {
 123     float scaleFactor = pageZoomFactor(this);
 124     setAbsoluteLocation(roundedLayoutPoint(FloatPoint(pageX() * scaleFactor, pageY() * scaleFactor)));
 125 }
 126
 127 void MouseRelatedEvent::receivedTarget()
 128 {
 129     m_hasCachedRelativePosition = false;
 130 }
 131
 132 void MouseRelatedEvent::computeRelativePosition()
 133 {
 134     Node* targetNode = target() ? target()->toNode() : nullptr;
 135     if (!targetNode)
 136         return;
 137
 138     // Compute coordinates that are based on the target.
 139     m_layerLocation = m_pageLocation;
 140     m_offsetLocation = m_pageLocation;
 141
 142     // Must have an updated layout tree for this math to work correctly.
 143     targetNode->document().updateLayoutIgnorePendingStylesheets();
 144
 145     // Adjust offsetLocation to be relative to the target's position.
 146     if (LayoutObject* r = targetNode->layoutObject()) {
 147         FloatPoint localPos = r->absoluteToLocal(FloatPoint(absoluteLocation()), UseTransforms);
 148         m_offsetLocation = roundedLayoutPoint(localPos);
 149         float scaleFactor = 1 / pageZoomFactor(this);
 150         if (scaleFactor != 1.0f)
 151             m_offsetLocation.scale(scaleFactor, scaleFactor);
 152     }
 153
 154     // Adjust layerLocation to be relative to the layer.
 155     // FIXME: event.layerX and event.layerY are poorly defined,
 156     // and probably don't always correspond to DeprecatedPaintLayer offsets.
 157     // https://bugs.webkit.org/show_bug.cgi?id=21868
 158     Node* n = targetNode;
 159     while (n && !n->layoutObject())
 160         n = n->parentNode();
 161
 162     if (n) {
 163         // FIXME: This logic is a wrong implementation of convertToLayerCoords.
 164         for (DeprecatedPaintLayer* layer = n->layoutObject()->enclosingLayer(); layer; layer = layer->parent())
 165             m_layerLocation -= toLayoutSize(layer->location());
 166     }
 167
 168     m_hasCachedRelativePosition = true;
 169 }
 170
 171 int MouseRelatedEvent::layerX()
 172 {
 173     if (!m_hasCachedRelativePosition)
 174         computeRelativePosition();
 175     return m_layerLocation.x();
 176 }
 177
 178 int MouseRelatedEvent::layerY()
 179 {
 180     if (!m_hasCachedRelativePosition)
 181         computeRelativePosition();
 182     return m_layerLocation.y();
 183 }
 184
 185 int MouseRelatedEvent::offsetX()
 186 {
 187     if (!hasPosition())
 188         return 0;
 189     if (!m_hasCachedRelativePosition)
 190         computeRelativePosition();
 191     return roundToInt(m_offsetLocation.x());
 192 }
 193
 194 int MouseRelatedEvent::offsetY()
 195 {
 196     if (!hasPosition())
 197         return 0;
 198     if (!m_hasCachedRelativePosition)
 199         computeRelativePosition();
 200     return roundToInt(m_offsetLocation.y());
 201 }
 202
 203 int MouseRelatedEvent::pageX() const
 204 {
 205     return m_pageLocation.x();
 206 }
 207
 208 int MouseRelatedEvent::pageY() const
 209 {
 210     return m_pageLocation.y();
 211 }
 212
 213 int MouseRelatedEvent::x() const
 214 {
 215     // FIXME: This is not correct.
 216     // See Microsoft documentation and <http://www.quirksmode.org/dom/w3c_events.html>.
 217     return m_clientLocation.x();
 218 }
 219
 220 int MouseRelatedEvent::y() const
 221 {
 222     // FIXME: This is not correct.
 223     // See Microsoft documentation and <http://www.quirksmode.org/dom/w3c_events.html>.
 224     return m_clientLocation.y();
 225 }
 226
 227 DEFINE_TRACE(MouseRelatedEvent)
 228 {
 229     UIEventWithKeyState::trace(visitor);
 230 }
 231
 232 } // namespace blink