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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: glxzoomwidget.cpp |
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15 * description of the class GlxGlxZoomWidget which controls the Zoom behavior of coverflow. |
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16 * |
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17 */ |
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18 #include <QPinchGesture> |
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19 #include <hbiconitem.h> |
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20 #include <glxmediamodel.h> |
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21 #include "glximagedecoderwrapper.h" |
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22 #include "glxmodelparm.h" |
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23 #include "glxzoomwidget.h" |
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24 |
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25 GlxZoomWidget::GlxZoomWidget(QGraphicsItem *parent):HbScrollArea(parent), mModel(NULL), mImageDecodeRequestSend(false), mPinchGestureOngoing(false), mDecodedImageAvailable(false) |
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26 { |
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27 grabGesture(Qt::PinchGesture); |
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28 setAcceptTouchEvents(true) ; |
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29 setFrictionEnabled(false); |
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30 setZValue(MINZVALUE); |
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31 //create the child items and background |
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32 mZoomWidget = new QGraphicsWidget(this); |
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33 mZoomItem = new QGraphicsPixmapItem(mZoomWidget); |
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34 mZoomItem->setTransformationMode(Qt::SmoothTransformation); |
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35 //the black background |
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36 //replace when a proper substitute for setting backgrounds is known |
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37 mBlackBackgroundItem = new HbIconItem(this); |
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38 mBlackBackgroundItem->setBrush(QBrush(Qt::black)); |
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39 mBlackBackgroundItem->hide(); |
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40 //does not work so is commented |
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41 //setBackgroundItem(mBlackBackgroundItem); |
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42 |
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43 //initializing the image decoder |
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44 mImageDecoder = new GlxImageDecoderWrapper; |
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45 connect(this,SIGNAL( pinchGestureReceived(int) ), this, SLOT( sendDecodeRequest(int) ), Qt::QueuedConnection ); |
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46 } |
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47 |
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48 GlxZoomWidget::~GlxZoomWidget() |
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49 { |
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50 //disconnect all existing signals |
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51 disconnect(this,SIGNAL( pinchGestureReceived(int) ), this, SLOT( sendDecodeRequest(int) ) ); |
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52 //no Null checks required |
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53 delete mZoomItem; |
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54 // delete mZoomWidget; //as this is a content widegt it will automatically be deleted |
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55 delete mBlackBackgroundItem; |
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56 //reset the decoder to cancel pending tasks |
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57 if(mImageDecoder) { |
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58 mImageDecoder->resetDecoder(); |
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59 delete mImageDecoder; |
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60 } |
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61 } |
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62 |
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63 void GlxZoomWidget::setModel (QAbstractItemModel *model) |
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64 { |
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65 if(model) |
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66 { |
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67 mModel = model; |
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68 retreiveFocusedImage(); //Update mZoomItem with focused Image |
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69 connect( mModel, SIGNAL( dataChanged(QModelIndex,QModelIndex) ), this, SLOT( dataChanged(QModelIndex,QModelIndex) ) ); |
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70 } |
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71 } |
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72 |
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73 void GlxZoomWidget::setWindowSize(QSize windowSize) |
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74 { |
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75 mWindowSize = windowSize; |
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76 mBlackBackgroundItem->setGeometry(QRectF(QPointF(0,0), mWindowSize)); |
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77 //try to reset the max and min zoomed size here |
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78 } |
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79 |
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80 void GlxZoomWidget::indexChanged(int index) |
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81 { |
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82 Q_UNUSED(index); |
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83 if(mFocusIndex != index) { |
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84 mImageDecoder->resetDecoder();//reset the decoder first to cancel pending tasks |
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85 mImageDecodeRequestSend = false; |
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86 mDecodedImageAvailable = false; |
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87 retreiveFocusedImage(); //Update mZoomItem with focused Image |
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88 } |
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89 } |
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90 |
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91 bool GlxZoomWidget::sceneEvent(QEvent *event) |
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92 { |
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93 bool consume(false); |
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94 if (event->type() == QEvent::Gesture) { |
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95 consume = executeGestureEvent(this, static_cast<QGestureEvent*>(event)); |
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96 } |
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97 if(!consume) |
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98 { |
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99 consume = HbScrollArea::sceneEvent(event); |
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100 } |
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101 return consume; |
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102 } |
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103 |
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104 bool GlxZoomWidget::sceneEventFilter(QGraphicsItem *watched,QEvent *event) |
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105 { |
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106 qDebug("GlxCoverFlow::eventFilter " ); |
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107 bool consume = false; |
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108 if (event->type() == QEvent::Gesture) { |
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109 consume = executeGestureEvent(watched, static_cast<QGestureEvent*>(event)); |
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110 } |
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111 |
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112 if(!consume) { |
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113 consume = HbScrollArea::sceneEventFilter(watched,event); |
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114 } |
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115 return consume; |
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116 |
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117 } |
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118 |
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119 bool GlxZoomWidget::executeGestureEvent(QGraphicsItem *source,QGestureEvent *event) |
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120 { |
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121 if (QGesture *pinch = event->gesture(Qt::PinchGesture)) { |
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122 QPinchGesture* pinchG = static_cast<QPinchGesture *>(pinch); |
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123 QPinchGesture::ChangeFlags changeFlags = pinchG->changeFlags(); |
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124 if (changeFlags & QPinchGesture::ScaleFactorChanged) { |
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125 mPinchGestureOngoing = true; |
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126 //bring the zoom widget to foreground |
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127 setZValue(MAXZVALUE); |
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128 //show the black background |
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129 mBlackBackgroundItem->setParentItem(parentItem()); |
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130 mBlackBackgroundItem->setZValue(MAXZVALUE - 1); |
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131 mBlackBackgroundItem->show(); |
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132 |
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133 //retreive the gesture values |
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134 qreal value = pinchG->scaleFactor() / pinchG->lastScaleFactor(); |
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135 QPointF center = pinchG->property("centerPoint").toPointF(); |
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136 //set the gesture center to the scene coordinates |
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137 QPointF sceneGestureCenter = source->sceneTransform().map(center); |
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138 zoomImage(value, sceneGestureCenter); |
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139 |
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140 } |
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141 if (pinchG->state() == Qt::GestureStarted) { |
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142 emit pinchGestureReceived(mFocusIndex); |
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143 } |
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144 |
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145 if (pinchG->state() == Qt::GestureFinished) { |
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146 if(mStepCurrentSize != mCurrentSize) { |
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147 //For giving a spring effect when user has zoomed more than normal. |
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148 if(mStepCurrentSize.width() > mMaxScaleDecSize.width()) { |
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149 //scale the image to limited size |
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150 qreal value = mMaxScaleDecSize.width()/mCurrentSize.width(); |
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151 QPointF center(mWindowSize.width()/2, mWindowSize.height()/2); |
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152 QPointF sceneGestureCenter = source->sceneTransform().map(center); |
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153 zoomImage(value, sceneGestureCenter); |
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154 } |
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155 mPinchGestureOngoing = false; |
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156 //finalize the transforms to the geometry else panning will not work |
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157 finalizeWidgetTransform(); |
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158 } |
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159 //push the Zoom widget to background when zoomed image size nears FS image |
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160 if(mStepCurrentSize.width() <= mMinDecScaleSize.width()*1.3) { |
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161 mBlackBackgroundItem->hide(); |
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162 //push the widget back to background |
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163 setZValue(MINZVALUE); |
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164 emit zoomWidgetMovedBackground(mFocusIndex); |
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165 //do not reset the transform here as it will then zoom-in the widget to decoded image size |
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166 } |
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167 } |
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168 //gesture accepted |
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169 return true; |
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170 } |
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171 //gesture rejected |
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172 if(!mPinchGestureOngoing) { |
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173 return false; |
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174 } |
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175 return true; |
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176 |
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177 } |
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178 |
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179 void GlxZoomWidget::zoomImage(qreal zoomFactor, QPointF center) |
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180 { |
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181 adjustGestureCenter(center, zoomFactor); |
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182 QSizeF requiredSize(mCurrentSize.width()*zoomFactor, mCurrentSize.height()*zoomFactor); |
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183 limitRequiredSize(requiredSize); |
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184 if(requiredSize != mCurrentSize) { |
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185 QTransform zoomTransform = mZoomWidget->transform(); |
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186 QPointF transformedCenter = mZoomWidget->sceneTransform().inverted().map(center); |
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187 zoomTransform.translate(transformedCenter.x(),transformedCenter.y()); |
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188 zoomTransform.scale(requiredSize.width()/mCurrentSize.width(), requiredSize.height()/mCurrentSize.height()); |
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189 zoomTransform.translate(-transformedCenter.x(),-transformedCenter.y()); |
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190 mZoomWidget->setTransform(zoomTransform); |
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191 mCurrentSize = requiredSize; |
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192 } |
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193 |
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194 } |
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195 |
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196 |
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197 void GlxZoomWidget::limitRequiredSize(QSizeF &requiredSize) |
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198 { |
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199 if(requiredSize.width() > mMaxScaleSize.width() ) { |
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200 requiredSize = mMaxScaleSize ; |
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201 } |
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202 else if(requiredSize.width() < mMinDecScaleSize.width() ) { |
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203 requiredSize = mMinDecScaleSize ; |
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204 } |
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205 |
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206 |
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207 } |
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208 |
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209 //makes sure that the gesture is on the screen center if the image is smaller than the screen |
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210 void GlxZoomWidget::adjustGestureCenter(QPointF & gestureCenter, qreal& zoomFactor) |
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211 { |
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212 if(zoomFactor > 1 &&zoomFactor > 1.2 ) { |
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213 zoomFactor = 1.2; |
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214 } |
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215 |
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216 if(zoomFactor < 1 &&zoomFactor < 0.8 ) { |
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217 zoomFactor = 0.8; |
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218 } |
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219 QSizeF requiredSize(mCurrentSize.width()*zoomFactor, mCurrentSize.height()*zoomFactor); |
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220 //keep smaller image centered |
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221 if(mCurrentSize.width() <= mWindowSize.width() ) |
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222 { |
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223 gestureCenter.setX(mWindowSize.width()/2); |
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224 |
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225 } |
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226 if(mCurrentSize.height() <= mWindowSize.height()) |
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227 { |
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228 gestureCenter.setY(mWindowSize.height()/2); |
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229 |
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230 } |
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231 //maintains the boundary of the edges for zoom out conditions |
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232 if(zoomFactor < 1) |
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233 { |
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234 QPointF itemOriginPos = mZoomWidget->sceneTransform().map(QPointF(0,0)); |
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235 bool hasWidthExceededWindow = mCurrentSize.width() > mWindowSize.width(); |
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236 bool hasHeightExceededWindow = mCurrentSize.height() > mWindowSize.height(); |
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237 if(itemOriginPos.x() >= 0) { |
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238 //image has crossed left boundry leaving blank space |
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239 if(hasWidthExceededWindow) { |
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240 //stick the gesture to the left corner |
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241 gestureCenter.setX(itemOriginPos.x()); |
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242 } |
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243 } |
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244 //Check if the right boundry can be adjusted |
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245 if(itemOriginPos.x()+ mCurrentSize.width() <= mWindowSize.width()) { |
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246 //Image is before the right boundry leaving blank space |
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247 if(hasWidthExceededWindow) { |
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248 //stick the gesture to the right corner |
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249 gestureCenter.setX(itemOriginPos.x()+ mCurrentSize.width()); |
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250 } |
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251 } |
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252 //check if the upper boundry could be adjusted |
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253 if(itemOriginPos.y() >= 0) { |
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254 //image has crossed the upper boundry leaving blank space |
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255 if(hasHeightExceededWindow) { |
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256 //stick the image to the upper boundry |
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257 gestureCenter.setY(itemOriginPos.y()); |
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258 } |
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259 } |
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260 //check if the lower boundry could be adjusted |
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261 if(itemOriginPos.y()+ mCurrentSize.height() <= mWindowSize.height()) { |
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262 //Image is before the right boundry leaving blank space |
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263 if(hasHeightExceededWindow) { |
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264 //stick the image to the right corner |
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265 gestureCenter.setY(itemOriginPos.y()+ mCurrentSize.height()); |
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266 } |
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267 |
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268 } |
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269 } |
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270 //control the zoom Factor to boundaries |
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271 if(mCurrentSize.width() > mWindowSize.width() && requiredSize.width() <= mWindowSize.width()) |
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272 { |
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273 zoomFactor = mWindowSize.width()/mCurrentSize.width(); |
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274 |
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275 } |
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276 else if(mCurrentSize.height() > mWindowSize.height() && requiredSize.height() <= mWindowSize.height()) |
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277 { |
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278 zoomFactor = mWindowSize.height()/mCurrentSize.height(); |
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279 |
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280 } |
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281 |
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282 //reduce the ZF so as to show a decelerated effect at max/min levels |
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283 |
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284 if(mCurrentSize.width() > mMaxScaleDecSize.width() && zoomFactor > 1 ) { |
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285 zoomFactor = 1.0 + ((zoomFactor-1.0)/6) ; |
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286 } |
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287 if(mCurrentSize.width() < mMinDecScaleSize.width() && zoomFactor < 1 ) { |
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288 zoomFactor = 1.0 - ((1.0-zoomFactor)/6) ; |
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289 } |
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290 |
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291 |
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292 } |
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293 |
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294 //get the latest focused image and set it to mZoomItem |
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295 void GlxZoomWidget::retreiveFocusedImage() |
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296 { |
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297 |
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298 QPixmap targetPixmap(getFocusedImage()); |
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299 //initialize all the variables wrt the focussed pixmap |
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300 mZoomWidget->resetTransform(); |
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301 mItemSize = targetPixmap.size(); |
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302 mMaxScaleSize = mItemSize; |
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303 mMaxScaleSize.scale(mWindowSize*13, Qt::KeepAspectRatio); |
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304 mMaxScaleDecSize = mItemSize; |
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305 mMaxScaleDecSize.scale(mWindowSize*7, Qt::KeepAspectRatio); |
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306 mMinScaleSize = mItemSize* 0.7; |
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307 mMinDecScaleSize = mItemSize; |
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308 QPointF originPos = sceneTransform().map(QPointF(0,0)); |
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309 mZoomWidget->setGeometry(QRectF(QPointF(mWindowSize.width()/2 - mItemSize.width()/2,mWindowSize.height()/2 - mItemSize.height()/2),mItemSize )); //chk this |
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310 mZoomWidget->setPreferredSize(mItemSize); |
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311 mZoomItem->setPixmap(targetPixmap); |
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312 mCurrentSize = mItemSize; |
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313 mStepCurrentSize = mItemSize; |
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314 setContentWidget(mZoomWidget); |
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315 show(); |
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316 } |
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317 |
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318 |
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319 void GlxZoomWidget::dataChanged(QModelIndex startIndex, QModelIndex endIndex) |
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320 { |
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321 if(mFocusIndex >= startIndex.row() && mFocusIndex <= endIndex.row()) { |
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322 //get the latest image from the model |
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323 //will replace a decoded image if callback is received after decoded image is received so a fix is required |
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324 //retreiveFocusedImage(); |
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325 if(!mDecodedImageAvailable) { |
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326 QPixmap targetPixmap(getFocusedImage()); |
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327 mZoomItem->setPixmap(targetPixmap); |
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328 finalizeWidgetTransform(); |
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329 } |
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330 } |
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331 } |
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332 |
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333 void GlxZoomWidget::decodedImageAvailable() |
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334 { |
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335 //new bitmap with better resolution is available |
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336 //so set it to the item |
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337 QPixmap decodedPixmap = mImageDecoder->getPixmap(); |
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338 disconnect(mImageDecoder, SIGNAL(pixmapDecoded()), this, SLOT(decodedImageAvailable())); |
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339 if(decodedPixmap.isNull()){ |
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340 return; |
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341 } |
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342 mDecodedImageAvailable = true; |
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343 mZoomItem->setPixmap(decodedPixmap); |
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344 mItemSize = decodedPixmap.size(); |
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345 //this is important if not done then old transforms will be applied on the new image |
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346 finalizeWidgetTransform(); |
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347 } |
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348 |
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349 void GlxZoomWidget::sendDecodeRequest(int index) |
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350 { |
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351 if(!mImageDecodeRequestSend) { |
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352 QString imagePath = (mModel->data(mModel->index(index,0),GlxUriRole)).value<QString>(); |
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353 mImageDecoder->decodeImage(imagePath); |
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354 connect(mImageDecoder, SIGNAL(pixmapDecoded()), this, SLOT(decodedImageAvailable())); |
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355 mImageDecodeRequestSend = true; |
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356 } |
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357 } |
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358 |
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359 |
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360 void GlxZoomWidget::finalizeWidgetTransform() |
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361 { |
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362 QPointF widgetPos = mZoomWidget->sceneTransform().map(QPointF(0,0)); //Map the origin wrt scene |
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363 mZoomWidget->resetTransform(); |
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364 mZoomWidget->scale(mCurrentSize.width()/mItemSize.width(), mCurrentSize.height()/mItemSize.height()); |
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365 mZoomWidget->setGeometry(QRectF(widgetPos , mCurrentSize)); |
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366 // this updates HbScrollArea on the sizeHint of ZoomWidget |
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367 mZoomWidget->setPreferredSize(mCurrentSize); |
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368 mStepCurrentSize = mCurrentSize; |
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369 } |
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370 |
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371 QPixmap GlxZoomWidget::getFocusedImage() |
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372 { |
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373 mFocusIndex = mModel->data(mModel->index(0,0),GlxFocusIndexRole).value<int>(); |
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374 QVariant iconVariant = mModel->data(mModel->index(mFocusIndex,0),GlxFsImageRole); |
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375 QVariant sizeVariant = mModel->data(mModel->index(mFocusIndex,0),GlxDimensionsRole); |
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376 QPixmap targetPixmap; |
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377 //retreive pixmap from the HbIcon received from model |
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378 //should change the model to return and save pixmaps and convert to HbIcons Instead |
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379 if ( iconVariant.isValid() && iconVariant.canConvert<HbIcon> () ) { |
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380 QIcon itemIcon = iconVariant.value<HbIcon>().qicon(); |
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381 QSize itemSize = itemIcon.actualSize(mWindowSize); |
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382 QSize scaleSize; |
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383 if(sizeVariant.isValid() && sizeVariant.canConvert<QSize> ()) { |
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384 scaleSize = sizeVariant.toSize(); |
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385 if(!(scaleSize.width() < mWindowSize.width() && scaleSize.height() < mWindowSize.height())) { |
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386 scaleSize = mWindowSize; |
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387 } |
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388 } |
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389 targetPixmap = itemIcon.pixmap(itemSize).scaled(scaleSize, Qt::KeepAspectRatio); |
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390 mItemSize = targetPixmap.size(); |
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391 } |
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392 return targetPixmap; |
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393 |
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394 } |
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395 |
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396 |
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397 |
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398 void GlxZoomWidget::cleanUp() |
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399 { |
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400 // disconnect( mModel, SIGNAL( dataChanged(QModelIndex,QModelIndex) ), this, SLOT( dataChanged(QModelIndex,QModelIndex) ) ); |
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401 if(mImageDecoder) { |
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402 mImageDecoder->resetDecoder(); |
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403 } |
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404 mZoomItem->setPixmap(QPixmap()); |
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405 } |
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406 |
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407 void GlxZoomWidget::activate() |
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408 { |
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409 } |
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410 |
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411 |