Source/WebKit2/UIProcess/API/efl/tizen/Zoom.cpp

   1 /*
   2  * Copyright (C) 2012 Samsung Electronics
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public License
  15  * along with this program; see the file COPYING.LIB.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "config.h"
  21 #include "Zoom.h"
  22
  23 #include "PageClientImpl.h"
  24 #include "ewk_view_private.h"
  25
  26 #if ENABLE(TIZEN_WEBKIT2_TEXT_ZOOM)
  27 #include "WebPageGroup.h"
  28 #include "WebPreferences.h"
  29 #endif
  30
  31 using namespace WebCore;
  32 using namespace WebKit;
  33
  34 const double Zoom::s_scaleFactorThreshold = 0.01;
  35
  36 static IntPoint getNewScrollPosition(const IntPoint& scrollPosition, const IntPoint& basisPoint, double baseScaleFactor, double newScaleFactor)
  37 {
  38     if (!baseScaleFactor)
  39         return IntPoint();
  40
  41     double scaleDifference = newScaleFactor / baseScaleFactor;
  42     int newScrollX = (scrollPosition.x() + basisPoint.x()) * scaleDifference - basisPoint.x();
  43     int newScrollY = (scrollPosition.y() + basisPoint.y()) * scaleDifference - basisPoint.y();
  44
  45     return IntPoint(newScrollX, newScrollY);
  46 }
  47
  48 static int getPointDistanceSquare(const IntPoint& point1, const IntPoint& point2)
  49 {
  50     int xDistance = point1.x() - point2.x();
  51     int yDistance = point1.y() - point2.y();
  52     return xDistance * xDistance + yDistance * yDistance;
  53 }
  54
  55 Zoom::Zoom(Evas_Object* viewWidget)
  56     : m_viewWidget(viewWidget)
  57     , m_isZooming(false)
  58     , m_isZoomInformationUpdated(false)
  59     , m_baseScaleFactor(0)
  60     , m_newScaleFactor(0)
  61     , m_currentScaleFactor(0)
  62     , m_baseScrollPosition()
  63     , m_newScrollPosition()
  64     , m_basisPoint()
  65     , m_centerPoint()
  66     , m_viewLocation()
  67     , m_zoomAnimator(0)
  68 {
  69 }
  70
  71 Zoom::~Zoom()
  72 {
  73     if (m_zoomAnimator)
  74         ecore_animator_del(m_zoomAnimator);
  75 }
  76
  77 void Zoom::start(const IntPoint& centerPoint, const IntPoint& viewLocation)
  78 {
  79     PageClientImpl* pageClientImpl = ewkViewGetPageClient(m_viewWidget);
  80     EINA_SAFETY_ON_NULL_RETURN(pageClientImpl);
  81     m_isZooming = true;
  82     m_isZoomInformationUpdated = false;
  83     m_baseScaleFactor = pageClientImpl->scaleFactor();
  84     m_newScaleFactor = m_baseScaleFactor;
  85     m_currentScaleFactor = m_baseScaleFactor;
  86     m_newScrollPosition = m_baseScrollPosition = pageClientImpl->scrollPosition();
  87     m_centerPoint = centerPoint;
  88     int viewX, viewY;
  89     evas_object_geometry_get(m_viewWidget, &viewX, &viewY, 0, 0);
  90     m_viewLocation = IntPoint(viewX, viewY);
  91
  92     m_basisPoint.setX(centerPoint.x() - m_viewLocation.x());
  93     m_basisPoint.setY(centerPoint.y() - m_viewLocation.y());
  94
  95     if (m_zoomAnimator)
  96         ecore_animator_del(m_zoomAnimator);
  97     m_zoomAnimator = ecore_animator_add(zoomAnimatorCallback, this);
  98
  99     // Notify that zoom is started.
 100     evas_object_smart_callback_call(m_viewWidget, "zoom,started", 0);
 101 }
 102
 103 void Zoom::stop()
 104 {
 105     m_isZooming = false;
 106 }
 107
 108 void Zoom::update(const double zoom, const IntPoint& centerPoint)
 109 {
 110     if (!m_isZooming)
 111         start(centerPoint, IntPoint());
 112
 113     PageClientImpl* pageClientImpl = ewkViewGetPageClient(m_viewWidget);
 114     EINA_SAFETY_ON_NULL_RETURN(pageClientImpl);
 115 #if ENABLE(TIZEN_WEBKIT2_TEXT_ZOOM)
 116     double newScaleFactor = m_baseScaleFactor * zoom;
 117     if (!pageClientImpl->page()->pageGroup()->preferences()->textZoomEnabled())
 118         newScaleFactor = pageClientImpl->adjustScaleWithViewport(newScaleFactor);
 119 #else
 120     double newScaleFactor = pageClientImpl->adjustScaleWithViewport(m_baseScaleFactor * zoom);
 121 #endif
 122
 123     if (fabs(newScaleFactor - m_newScaleFactor) > s_scaleFactorThreshold)
 124         m_newScaleFactor = newScaleFactor;
 125     else if (getPointDistanceSquare(m_centerPoint, centerPoint) <= s_zoomCenterDistanceSquareThreshold)
 126         return;
 127
 128     m_centerPoint = centerPoint;
 129     m_isZoomInformationUpdated = true;
 130 }
 131
 132 void Zoom::realStop()
 133 {
 134     if (m_zoomAnimator) {
 135         ecore_animator_del(m_zoomAnimator);
 136         m_zoomAnimator = 0;
 137     }
 138
 139     PageClientImpl* pageClientImpl = ewkViewGetPageClient(m_viewWidget);
 140     pageClientImpl->page()->scaleImage(m_newScaleFactor, m_newScrollPosition);
 141     EINA_SAFETY_ON_NULL_RETURN(pageClientImpl);
 142
 143 #if ENABLE(TIZEN_WEBKIT2_TEXT_ZOOM)
 144     if (pageClientImpl->page()->pageGroup()->preferences()->textZoomEnabled()) {
 145         double textScaleFactor = pageClientImpl->adjustScaleWithViewport(pageClientImpl->page()->textZoomFactor() * (m_newScaleFactor / m_baseScaleFactor));
 146         pageClientImpl->page()->scale(m_baseScaleFactor, m_baseScrollPosition);
 147         pageClientImpl->page()->setTextZoomFactor(textScaleFactor);
 148     } else
 149         pageClientImpl->page()->scale(m_newScaleFactor, m_newScrollPosition);
 150 #else
 151     pageClientImpl->page()->scale(m_newScaleFactor, m_newScrollPosition);
 152 #endif
 153
 154 #if ENABLE(TIZEN_WEBKIT2_TEXT_SELECTION)
 155     pageClientImpl->updateTextSelectionHandlesAndContextMenu(true);
 156 #endif
 157
 158     // Notify that zoom is finished.
 159     evas_object_smart_callback_call(m_viewWidget, "zoom,finished", 0);
 160 }
 161
 162 Eina_Bool Zoom::zoomAnimatorCallback(void* data)
 163 {
 164     static_cast<Zoom*>(data)->process();
 165     return ECORE_CALLBACK_RENEW;
 166 }
 167
 168 void Zoom::process()
 169 {
 170     if (!m_isZooming && (m_currentScaleFactor == m_newScaleFactor)) {
 171         realStop();
 172         return;
 173     }
 174
 175     if (!m_isZoomInformationUpdated)
 176         return;
 177
 178     double scaleStep = m_currentScaleFactor / 6;
 179     if (fabs(m_currentScaleFactor - m_newScaleFactor) > scaleStep) {
 180         if (m_newScaleFactor > m_currentScaleFactor)
 181             m_currentScaleFactor += scaleStep;
 182         else
 183             m_currentScaleFactor -= scaleStep;
 184     } else
 185         m_currentScaleFactor = m_newScaleFactor;
 186
 187     m_newScrollPosition = getNewScrollPosition(m_baseScrollPosition, m_basisPoint, m_baseScaleFactor, m_currentScaleFactor);
 188     m_newScrollPosition.setX(m_newScrollPosition.x() + m_basisPoint.x() - (m_centerPoint.x() - m_viewLocation.x()));
 189     m_newScrollPosition.setY(m_newScrollPosition.y() + m_basisPoint.y() - (m_centerPoint.y() - m_viewLocation.y()));
 190
 191     PageClientImpl* pageClientImpl = ewkViewGetPageClient(m_viewWidget);
 192     EINA_SAFETY_ON_NULL_RETURN(pageClientImpl);
 193     pageClientImpl->page()->scaleImage(m_currentScaleFactor, m_newScrollPosition);
 194
 195 #if ENABLE(TIZEN_WEBKIT2_TEXT_SELECTION)
 196     pageClientImpl->updateTextSelectionHandlesAndContextMenu(false);
 197 #endif
 198
 199     if (m_currentScaleFactor == m_newScaleFactor)
 200         m_isZoomInformationUpdated = false;
 201 }