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1 /* |
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2 * Copyright (c) 2007 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: layoutmanager implementation class with focus handling in 1D (next/previous) |
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15 * |
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16 */ |
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17 |
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18 |
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19 #include <alf/ialfwidgetcontrol.h> |
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20 #include <alf/alfvisual.h> |
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21 #include <alf/alfgridlayout.h> |
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22 #include "alf/alfwidget.h" |
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23 #include <alf/alfvisualfactory.h> |
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24 #include <alf/alfexceptions.h> |
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25 #include <alf/ialflayoutpreferences.h> |
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26 #include <osn/osnnew.h> |
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27 |
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28 //stl |
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29 #include <algorithm> //for min & max |
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30 |
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31 #include "alfgridlayoutmanagerimpl.h" |
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32 |
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33 using namespace Alf; |
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34 |
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35 namespace Alf |
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36 { |
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37 // ======== MEMBER FUNCTIONS ======== |
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38 |
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39 // --------------------------------------------------------------------------- |
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40 // layoutmanagerimpl constructor |
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41 // --------------------------------------------------------------------------- |
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42 // |
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43 AlfGridLayoutManagerImpl::AlfGridLayoutManagerImpl( |
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44 AlfGridLayoutManager& aGridLayoutManager) : |
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45 mGridLayoutManager(aGridLayoutManager) |
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46 { |
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47 } |
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48 |
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49 // --------------------------------------------------------------------------- |
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50 // creates the layout used by the layoutmanager. |
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51 // --------------------------------------------------------------------------- |
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52 // |
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53 AlfGridLayoutManagerImpl::~AlfGridLayoutManagerImpl() |
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54 { |
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55 } |
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56 |
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57 // --------------------------------------------------------------------------- |
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58 // from IAlfLayoutPreferences |
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59 // Returns the minimum area that this layout manager can occupy by observing |
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60 // the minimum sizes of the child UI elements in the layout |
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61 // --------------------------------------------------------------------------- |
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62 // |
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63 bool AlfGridLayoutManagerImpl::getMinimumSize( TAlfXYMetric& /*aMinSize*/ ) const |
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64 { |
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65 return false; |
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66 } |
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67 |
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68 // --------------------------------------------------------------------------- |
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69 // from IAlfLayoutPreferences |
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70 // Returns the maximum area that this layout manager can occupy by observing |
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71 // the maximum sizes of the child UI elements in the layout |
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72 // --------------------------------------------------------------------------- |
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73 // |
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74 bool AlfGridLayoutManagerImpl::getMaximumSize( TAlfXYMetric& /*aMaxSize*/ ) const |
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75 { |
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76 return false; |
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77 } |
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78 |
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79 // --------------------------------------------------------------------------- |
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80 // Combines and returns the preferred sizes of all child UI elements according |
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81 // to the layouting rules. |
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82 // --------------------------------------------------------------------------- |
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83 // |
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84 bool AlfGridLayoutManagerImpl::getPreferredSize(TAlfXYMetric& aPreferredSize) const |
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85 { |
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86 bool hasPreferredSize = false; |
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87 TAlfXYMetric resultSize = TAlfXYMetric(TAlfMetric(0), TAlfMetric(0)); |
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88 |
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89 const CAlfGridLayout& gridlayout = layout(); |
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90 const int childCount = mGridLayoutManager.count(); |
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91 const int gridColCount = gridlayout.ColumnCount(); |
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92 |
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93 //iterate the columns to calculate the preferred width. |
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94 const int colCount = std::min<int>(gridColCount, childCount); |
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95 for (int i = 0; i < colCount; i++) |
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96 { |
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97 CAlfWidgetControl* childWidgetControl = mGridLayoutManager.getControl(i); |
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98 //getControl may return null, but getLayoutPreferences checks that. |
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99 const IAlfLayoutPreferences* layoutPrefs = |
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100 mGridLayoutManager.getLayoutPreferences(childWidgetControl); |
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101 |
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102 if (layoutPrefs) |
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103 { |
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104 TAlfXYMetric prefSize; |
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105 if (layoutPrefs->getPreferredSize(prefSize)) |
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106 { |
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107 if(prefSize.iX.iUnit == EAlfUnitPixel) |
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108 { |
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109 resultSize.iX.iMagnitude += prefSize.iX.iMagnitude; |
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110 hasPreferredSize = true; |
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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 |
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116 //iterate the rows to calculate the preferred height |
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117 if (hasPreferredSize) |
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118 { |
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119 //count rows, that have at least one visual. |
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120 int usedRows = childCount / gridColCount; |
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121 if (childCount % gridColCount) |
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122 { |
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123 //last wor not filled completely, but still valid to get preferred height |
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124 //for this row also. |
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125 usedRows++; |
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126 } |
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127 |
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128 const int rowCount = std::min<int>(gridlayout.RowCount(), usedRows); |
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129 for (int i = 0; i < rowCount; i+= gridColCount) |
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130 { |
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131 CAlfWidgetControl* childWidgetControl = mGridLayoutManager.getControl(i); |
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132 //getControl may return null, but getLayoutPreferences checks that. |
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133 const IAlfLayoutPreferences* layoutPrefs = |
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134 mGridLayoutManager.getLayoutPreferences(childWidgetControl); |
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135 |
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136 if (layoutPrefs) |
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137 { |
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138 TAlfXYMetric prefSize; |
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139 if (layoutPrefs->getPreferredSize(prefSize)) |
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140 { |
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141 if(prefSize.iY.iUnit == EAlfUnitPixel) |
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142 { |
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143 resultSize.iY.iMagnitude += prefSize.iY.iMagnitude; |
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144 hasPreferredSize = true; |
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145 } |
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146 } |
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147 } |
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148 } |
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149 } |
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150 |
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151 aPreferredSize = resultSize; |
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152 return hasPreferredSize; |
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153 } |
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154 |
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155 // --------------------------------------------------------------------------- |
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156 // from IAlfLayoutPreferences |
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157 // At the moment doesn't do anything since preferred size is being queried |
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158 // from the child UI elements added to this layout manager. |
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159 // --------------------------------------------------------------------------- |
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160 // |
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161 void AlfGridLayoutManagerImpl::setPreferredSize( const TAlfXYMetric& aPreferredSize) |
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162 { |
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163 TAlfTimedPoint size((float)aPreferredSize.iX.iMagnitude,(float)aPreferredSize.iY.iMagnitude); |
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164 layout().SetSize(size); |
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165 mGridLayoutManager.owner().updateParentLayout(); |
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166 } |
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167 |
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168 // --------------------------------------------------------------------------- |
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169 // From class IAlfInterfaceBase. |
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170 // Getter for interfaces provided by the element. |
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171 // --------------------------------------------------------------------------- |
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172 // |
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173 IAlfInterfaceBase* AlfGridLayoutManagerImpl::makeInterface(const IfId& aType) |
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174 { |
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175 UString param(aType.mImplementationId); |
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176 if (param == IAlfLayoutPreferences::type().mImplementationId) |
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177 { |
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178 return this; |
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179 } |
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180 |
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181 return NULL; |
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182 } |
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183 |
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184 // --------------------------------------------------------------------------- |
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185 // returns the gridlayout used by the layoutmanager |
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186 // --------------------------------------------------------------------------- |
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187 // |
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188 CAlfGridLayout& AlfGridLayoutManagerImpl::layout() const |
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189 { |
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190 return dynamic_cast<CAlfGridLayout&>(mGridLayoutManager.getLayout()); |
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191 } |
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192 |
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193 } // Alf |