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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: |
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15 * |
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16 */ |
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17 |
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18 // System includes |
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19 #include <QGraphicsSceneEvent> |
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20 |
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21 // User includes |
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22 #include "radiostripbase.h" |
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23 |
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24 // Constants |
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25 |
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26 /*! |
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27 * |
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28 */ |
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29 RadioStripBase::RadioStripBase( QGraphicsItem* parent ) : |
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30 HbScrollArea( parent ), |
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31 mAutoScrollTime( 0 ), |
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32 mStripContainer( new HbWidget( this ) ), |
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33 mModel( 0 ), |
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34 mIsCyclic( true ), |
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35 mAutoCenter( false ), |
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36 mOverlap( 0 ), |
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37 mItemPoolParent( new QGraphicsWidget( NULL ) ), |
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38 mCurrentIndex( 0 ), |
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39 mPressedIndex( 0 ), |
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40 mStripLength( 0 ), |
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41 mContentsLength( 0 ) |
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42 { |
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43 setClampingStyle( HbScrollArea::NoClamping ); |
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44 setScrollDirections( Qt::Horizontal ); |
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45 setFlag( QGraphicsItem::ItemClipsChildrenToShape, true ); |
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46 setContentWidget( mStripContainer ); |
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47 setFrictionEnabled( true ); |
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48 setLongPressEnabled( false ); |
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49 setHorizontalScrollBarPolicy( HbScrollArea::ScrollBarAlwaysOff ); |
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50 setVerticalScrollBarPolicy( HbScrollArea::ScrollBarAlwaysOff ); |
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51 |
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52 // mItemParent is used to hold the unused QGraphicsItem's in the pool. It's visibility is set to false |
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53 // so the visibility of the items doesn't need to be modified. |
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54 mItemPoolParent->setVisible( false ); |
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55 } |
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56 |
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57 /*! |
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58 * |
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59 */ |
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60 RadioStripBase::~RadioStripBase() |
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61 { |
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62 } |
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63 |
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64 /*! |
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65 * |
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66 */ |
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67 void RadioStripBase::setAutoScrollTime( const int time ) |
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68 { |
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69 mAutoScrollTime = time; |
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70 } |
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71 |
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72 /*! |
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73 * |
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74 */ |
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75 int RadioStripBase::autoScrollTime() const |
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76 { |
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77 return mAutoScrollTime; |
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78 } |
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79 |
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80 /*! |
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81 * |
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82 */ |
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83 void RadioStripBase::setModel( QAbstractItemModel* model ) |
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84 { |
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85 if ( mModel != model ) |
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86 { |
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87 // if ( mModel ) |
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88 // { |
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89 // disconnectDataModel(); |
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90 // } |
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91 |
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92 mModel = model; |
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93 |
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94 if ( mModel ) |
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95 { |
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96 // connectDataModel(); |
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97 |
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98 mCurrentIndex = 0; |
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99 populateAndLayout(); |
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100 } |
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101 } |
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102 } |
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103 |
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104 /*! |
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105 * |
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106 */ |
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107 QAbstractItemModel* RadioStripBase::model() const |
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108 { |
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109 return mModel; |
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110 } |
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111 |
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112 /*! |
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113 * |
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114 */ |
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115 void RadioStripBase::setCyclic( bool isCyclic ) |
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116 { |
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117 mIsCyclic = isCyclic; |
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118 } |
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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 void RadioStripBase::setOverlap( qreal overlap ) |
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124 { |
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125 mOverlap = overlap; |
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126 } |
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127 |
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128 /*! |
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129 * |
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130 */ |
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131 void RadioStripBase::setAutoCenter( bool autoCenter ) |
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132 { |
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133 mAutoCenter = autoCenter; |
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134 } |
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135 |
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136 /*! |
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137 * |
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138 */ |
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139 void RadioStripBase::setItemSize( const QSizeF& size ) |
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140 { |
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141 if ( mItemSize != size ) { |
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142 mItemSize = size; |
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143 |
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144 prepareGeometryChange(); |
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145 |
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146 populateAndLayout(); |
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147 |
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148 update(); |
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149 updateGeometry(); |
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150 } |
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151 } |
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152 |
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153 /*! |
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154 * |
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155 */ |
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156 void RadioStripBase::setIndex( int index, bool animateToCenter ) |
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157 { |
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158 Q_UNUSED( animateToCenter ) |
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159 // Sanity checks |
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160 if ( !mModel || ( !mIsCyclic && ( index < 0 || index >= mModel->rowCount() ) ) ) { |
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161 return; |
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162 } |
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163 |
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164 const int oldIndex = mCurrentIndex; |
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165 if ( mIsCyclic ) |
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166 { |
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167 int numRows = mModel->rowCount(); |
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168 index = (index + numRows) % numRows; |
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169 } |
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170 Q_ASSERT( index >= 0 ); |
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171 |
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172 mCurrentIndex = index; |
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173 |
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174 updateItemWithIndex( mCurrentIndex ); |
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175 updateItemWithIndex( oldIndex ); |
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176 } |
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177 |
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178 /*! |
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179 * \reimp |
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180 */ |
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181 void RadioStripBase::resizeEvent( QGraphicsSceneResizeEvent* event ) |
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182 { |
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183 HbScrollArea::resizeEvent( event ); |
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184 populateAndLayout(); |
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185 } |
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186 |
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187 /*! |
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188 * \reimp |
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189 */ |
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190 void RadioStripBase::mousePressEvent( QGraphicsSceneMouseEvent* event ) |
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191 { |
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192 if ( event->button() != Qt::LeftButton || !mModel || !mModel->rowCount() ) |
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193 { |
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194 event->ignore(); |
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195 return; |
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196 } |
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197 |
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198 HbScrollArea::mousePressEvent( event ); |
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199 } |
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200 |
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201 /*! |
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202 * \reimp |
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203 */ |
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204 void RadioStripBase::mouseReleaseEvent( QGraphicsSceneMouseEvent* event ) |
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205 { |
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206 if ( event->button() != Qt::LeftButton ) |
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207 { |
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208 event->ignore(); |
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209 return; |
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210 } |
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211 |
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212 HbScrollArea::mouseReleaseEvent( event ); |
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213 } |
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214 |
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215 /*! |
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216 * |
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217 */ |
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218 void RadioStripBase::moveAllItemsToPool() |
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219 { |
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220 // set parent of all items to pool |
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221 foreach( QGraphicsItem* item, mItemAtSlot ) |
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222 { |
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223 item->setParentItem( mItemPoolParent ); |
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224 } |
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225 |
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226 // move all items to pool |
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227 mItemPool += mItemAtSlot; |
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228 mItemAtSlot.clear(); |
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229 mIndexAtSlot.clear(); |
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230 } |
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231 |
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232 /*! |
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233 * |
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234 */ |
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235 void RadioStripBase::populateAndLayout() |
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236 { |
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237 moveAllItemsToPool(); |
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238 |
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239 if ( !mModel || mModel->rowCount() == 0 ) |
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240 { |
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241 return; |
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242 } |
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243 |
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244 mStripLength = boundingRect().width(); |
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245 qreal itemSize = mItemSize.width(); |
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246 mContentsLength = mModel->rowCount() * (itemSize - mOverlap); |
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247 |
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248 if ( mIsCyclic ) |
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249 { |
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250 // if treating the items cyclically, double the content area so it can |
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251 // be shifted back and forth as you scroll |
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252 mContentsLength *= 2; |
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253 } |
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254 |
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255 qreal currPos = -mOverlap; |
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256 for ( int i = 0; i < mModel->rowCount(); ++i ) { |
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257 if ( currPos > mStripLength ) |
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258 { |
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259 break; |
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260 } |
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261 |
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262 QGraphicsItem* item = constructItem( i, true ); |
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263 if ( item ) |
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264 { |
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265 item->setPos( QPointF( currPos, 0 ) ); |
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266 currPos += itemSize - mOverlap; |
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267 } |
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268 } |
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269 |
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270 mStripContainer->setPreferredSize( mContentsLength, mItemSize.height() ); |
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271 |
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272 if ( mCurrentIndex >= 0 ) |
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273 { |
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274 setIndex( mCurrentIndex, false ); |
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275 } |
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276 } |
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277 |
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278 /*! |
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279 * |
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280 */ |
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281 QGraphicsItem* RadioStripBase::constructItem( int index, bool append ) |
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282 { |
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283 QGraphicsItem* item = getFromPool(); |
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284 |
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285 if ( mIsCyclic ) |
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286 { |
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287 Q_ASSERT( index >= 0 && index < 2 * mModel->rowCount() ); |
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288 |
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289 updateItemPrimitive( item, index % mModel->rowCount() ); |
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290 } |
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291 else |
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292 { |
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293 Q_ASSERT( index >= 0 && index < mModel->rowCount() ); |
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294 |
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295 updateItemPrimitive( item, index ); |
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296 } |
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297 |
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298 item->setParentItem( mStripContainer ); |
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299 |
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300 if ( append ) |
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301 { |
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302 mItemAtSlot.append( item ); |
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303 mIndexAtSlot.append( index ); |
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304 } |
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305 else |
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306 { |
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307 mItemAtSlot.prepend( item ); |
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308 mIndexAtSlot.prepend( index ); |
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309 } |
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310 |
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311 return item; |
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312 } |
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313 |
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314 /*! |
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315 * |
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316 */ |
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317 QGraphicsItem* RadioStripBase::getFromPool() |
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318 { |
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319 QGraphicsItem* item = 0; |
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320 |
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321 if ( mItemPool.isEmpty() ) |
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322 { |
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323 item = createItemPrimitive( this ); |
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324 } |
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325 else |
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326 { |
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327 item = mItemPool.takeFirst(); |
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328 } |
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329 |
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330 return item; |
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331 } |
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332 |
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333 /*! |
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334 * |
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335 */ |
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336 void RadioStripBase::returnToPool( QGraphicsItem* item ) |
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337 { |
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338 // Unparent the item so it doesn't get deleted |
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339 item->setParentItem( mItemPoolParent ); |
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340 mItemPool.append( item ); |
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341 } |
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342 |
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343 /*! |
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344 * Returns starting coordinate of the item with the specified index |
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345 */ |
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346 qreal RadioStripBase::indexToOffset( int index ) |
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347 { |
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348 return index * ( mItemSize.width() - mOverlap ) - mOverlap; |
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349 } |
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350 |
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351 /*! |
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352 * Returns item index for specified offset amount into the content |
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353 */ |
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354 int RadioStripBase::offsetToIndex( qreal offset ) |
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355 { |
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356 const int rows = mModel->rowCount(); |
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357 int index = (int)( offset / ( mItemSize.width() - mOverlap ) ); |
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358 |
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359 if ( mIsCyclic ) |
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360 { |
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361 return qBound( 0, index, 2 * rows - 1 ); |
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362 } |
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363 |
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364 return qBound( 0, index, rows - 1 ); |
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365 } |
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366 |
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367 /*! |
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368 * updates items with specified index value |
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369 */ |
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370 void RadioStripBase::updateItemWithIndex( int index ) |
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371 { |
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372 if( index >= 0 ) |
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373 { |
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374 QList<QGraphicsItem *>::const_iterator item = mItemAtSlot.constBegin(); |
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375 QList<QGraphicsItem *>::const_iterator itemsEnd = mItemAtSlot.constEnd(); |
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376 QList<int>::const_iterator itemIndex = mIndexAtSlot.constBegin(); |
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377 const int rowCount = mModel->rowCount(); |
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378 |
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379 // Find all items with this index (can be 2 in special cycling case) |
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380 for( ; item != itemsEnd; ++item, ++itemIndex ) |
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381 { |
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382 if( index == *itemIndex || index == *itemIndex - rowCount ) |
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383 { |
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384 // update those items |
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385 updateItemPrimitive( *item, index ); |
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386 } |
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387 } |
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388 } |
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389 } |
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390 |
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391 /*! |
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392 * Updates items during scrolling: removing invisible items and adding items that became visible |
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393 */ |
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394 void RadioStripBase::adjustItems() |
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395 { |
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396 qreal contentPos = mStripContainer->pos().x(); |
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397 |
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398 if ( mIsCyclic ) |
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399 { |
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400 if ( -contentPos < 0 ) |
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401 { |
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402 // trying to display off the left end of the strip, so |
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403 // shift the strip one length to the left |
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404 contentPos -= mContentsLength * 0.5; |
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405 mStripContainer->setPos( QPointF ( contentPos, mStripContainer->pos().y() ) ); |
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406 } else if (-contentPos > mContentsLength * 0.5) { |
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407 // trying to display off the right end of the strip, so |
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408 // shift the strip one length to the right |
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409 contentPos += mContentsLength * 0.5; |
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410 mStripContainer->setPos( QPointF ( contentPos, mStripContainer->pos().y() ) ); |
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411 } |
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412 } |
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413 |
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414 // find the first and last indices of the visible items |
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415 int firstVisibleIndex = offsetToIndex( -contentPos ); |
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416 int lastVisibleIndex = offsetToIndex( -contentPos + mStripLength ); |
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417 |
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418 // remove items at the start that are no longer visible |
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419 while ( !mIndexAtSlot.isEmpty() ) |
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420 { |
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421 int firstSlotIndex = mIndexAtSlot.first(); |
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422 if ( firstVisibleIndex <= firstSlotIndex ) |
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423 { |
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424 break; |
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425 } |
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426 |
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427 returnToPool( mItemAtSlot.first() ); |
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428 mItemAtSlot.removeFirst(); |
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429 mIndexAtSlot.removeFirst(); |
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430 } |
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431 |
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432 // remove items at the end that are no longer visible |
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433 while ( !mIndexAtSlot.isEmpty() ) |
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434 { |
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435 int lastSlotIndex = mIndexAtSlot.last(); |
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436 if ( lastVisibleIndex >= lastSlotIndex ) |
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437 { |
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438 break; |
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439 } |
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440 |
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441 returnToPool( mItemAtSlot.last() ); |
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442 mItemAtSlot.removeLast(); |
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443 mIndexAtSlot.removeLast(); |
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444 } |
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445 |
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446 if ( mItemAtSlot.isEmpty() ) |
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447 { |
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448 // fill area with all needed items |
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449 for ( int i = firstVisibleIndex; i <= lastVisibleIndex; ++i ) |
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450 { |
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451 QGraphicsItem* item = constructItem( i, true ); |
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452 if ( item ) |
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453 { |
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454 item->setPos( QPointF( indexToOffset( i ), 0 ) ); |
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455 } |
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456 } |
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457 } |
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458 else |
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459 { |
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460 // add missing items at the front |
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461 int firstItemToCreate = mIndexAtSlot.first()-1; |
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462 for ( int i = firstItemToCreate; i >= firstVisibleIndex; --i ) |
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463 { |
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464 QGraphicsItem* item = constructItem( i, false ); |
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465 if ( item ) |
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466 { |
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467 item->setPos( QPointF( indexToOffset( i ), 0 ) ); |
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468 } |
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469 } |
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470 |
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471 // add missing items at the end |
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472 firstItemToCreate = mIndexAtSlot.last()+1; |
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473 for ( int i = firstItemToCreate; i <= lastVisibleIndex; ++i ) |
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474 { |
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475 QGraphicsItem* item = constructItem( i, true ); |
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476 if ( item ) |
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477 { |
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478 item->setPos( QPointF( indexToOffset( i ), 0 ) ); |
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479 } |
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480 } |
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481 } |
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482 } |
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483 |
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484 /*! |
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485 * \reimp |
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486 */ |
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487 bool RadioStripBase::scrollByAmount( const QPointF& delta ) |
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488 { |
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489 bool ret = HbScrollArea::scrollByAmount( delta ); |
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490 |
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491 adjustItems(); |
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492 scrollPosChanged(); |
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493 |
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494 return ret; |
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495 } |