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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: Customized scroll area which handles dynamic slide loading in |
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15 * unifiedviewer |
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16 * |
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17 */ |
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18 |
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19 #include "uniscrollarea.h" |
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20 |
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21 #include <HbScrollBar> |
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22 |
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23 //--------------------------------------------------------------- |
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24 //UniScrollArea :: UniScrollArea |
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25 // @see header file |
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26 //--------------------------------------------------------------- |
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27 UniScrollArea::UniScrollArea(QGraphicsItem * parent) : |
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28 HbScrollArea(parent), mCurrentSlide(0), mTotalSlides(0) |
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29 { |
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30 bool flag = connect(this, SIGNAL(scrollingEnded()), |
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31 this, SLOT(handleScrollingEnded())); |
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32 bool flag1 = connect(this, SIGNAL(scrollingStarted()), |
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33 this, SLOT(handleScrollingStarted())); |
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34 |
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35 } |
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36 |
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37 //--------------------------------------------------------------- |
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38 //UniScrollArea :: ~UniScrollArea |
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39 // @see header file |
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40 //--------------------------------------------------------------- |
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41 UniScrollArea::~UniScrollArea() |
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42 { |
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43 |
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44 } |
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45 |
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46 //--------------------------------------------------------------- |
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47 //UniScrollArea :: setTotalSlides |
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48 // @see header file |
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49 //--------------------------------------------------------------- |
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50 void UniScrollArea::setTotalSlides(int totalSlides) |
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51 { |
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52 mTotalSlides = totalSlides; |
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53 } |
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54 |
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55 //--------------------------------------------------------------- |
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56 //UniScrollArea :: resetCurrentSlide |
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57 // @see header file |
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58 //--------------------------------------------------------------- |
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59 void UniScrollArea::resetCurrentSlide() |
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60 { |
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61 mCurrentSlide = 0; |
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62 } |
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63 |
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64 //--------------------------------------------------------------- |
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65 //UniScrollArea :: handleScrollingEnded |
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66 // @see header file |
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67 //--------------------------------------------------------------- |
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68 void UniScrollArea::handleScrollingEnded() |
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69 { |
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70 // TODO : reduce the complexity , code readability |
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71 // TODO : avoid calculating the heights every time |
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72 int currentSlide = -1; |
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73 QList<qreal> heights; |
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74 heights.clear(); |
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75 // contents() is not available so replaced with contentWidget() |
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76 // mScrollEndPoint = this->contents()->pos(); |
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77 mScrollEndPoint = this->contentWidget()->pos(); |
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78 // contents() is not available so replaced with contentWidget() |
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79 QList<QGraphicsItem *> list = this->contentWidget()->childItems(); |
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80 for (int i = 0; i < list.size(); i++) |
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81 { |
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82 QRectF rect = list[i]->boundingRect(); |
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83 heights.append(- (rect.height())); |
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84 } |
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85 |
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86 qreal h = 0.0; |
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87 for (int i = 0; i < heights.size(); i++) |
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88 { |
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89 h += heights.at(i); |
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90 if (mScrollEndPoint.y() > h) |
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91 { |
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92 currentSlide = i; |
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93 break; |
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94 } |
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95 } |
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96 |
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97 if (mScrollEndPoint.y() < mScrollStartPoint.y()) |
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98 { |
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99 //Identify if we are in last slide / last but one slide as we always |
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100 // assume the slide next to current slide is always loaded |
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101 //(Assumtion is based on slide initial load count of 2) |
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102 if (currentSlide >= mTotalSlides - 1) |
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103 { |
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104 return; |
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105 } |
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106 //(This can be removed and emit signal if we cross 50% of last slide) |
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107 if (currentSlide >= mTotalSlides - 2) |
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108 { |
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109 return; |
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110 } |
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111 |
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112 //Determine how much we have scrolled & if we have scrolled beyond 50% |
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113 //of current slide load the slide next to next slide |
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114 qreal delta = heights.at(currentSlide) / 2; |
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115 qreal fh = h - delta; |
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116 if (mScrollEndPoint.y() < fh) |
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117 { |
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118 emit scrolledToNextSlide(); |
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119 } |
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120 } |
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121 |
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122 } |
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123 |
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124 //--------------------------------------------------------------- |
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125 //UniScrollArea :: handleScrollingStarted |
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126 // @see header file |
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127 //--------------------------------------------------------------- |
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128 void UniScrollArea::handleScrollingStarted() |
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129 { |
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130 // contents() is not available so replaced with contentWidget() |
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131 // mScrollStartPoint = this->contents()->pos(); |
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132 mScrollStartPoint = this->contentWidget()->pos(); |
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133 } |
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134 |
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135 //--------------------------------------------------------------- |
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136 //UniScrollArea :: setPosToStart |
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137 // @see header file |
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138 //--------------------------------------------------------------- |
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139 void UniScrollArea::setPosToStart() |
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140 { |
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141 // contents() is not available so replaced with contentWidget() |
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142 QGraphicsItem* widgetItem = this->contentWidget(); |
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143 widgetItem->setPos(0, 0); |
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144 } |
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145 |
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146 //--------------------------------------------------------------- |
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147 //UniScrollArea :: upGesture |
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148 // @see header file |
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149 //--------------------------------------------------------------- |
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150 void UniScrollArea::upGesture(int value) |
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151 { |
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152 Q_UNUSED(value) |
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153 } |
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154 |
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155 //--------------------------------------------------------------- |
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156 //UniScrollArea :: downGesture |
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157 // @see header file |
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158 //--------------------------------------------------------------- |
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159 void UniScrollArea::downGesture(int value) |
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160 { |
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161 Q_UNUSED(value) |
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162 } |
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163 |
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164 // EOF |