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: layoutpreferences implementation for flowlayoutmanager. |
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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 <assert.h> |
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20 #include <alf/ialfwidgetcontrol.h> |
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21 #include "alf/alfwidget.h" |
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22 #include <alf/alfexceptions.h> |
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23 #include <alf/ialflayoutpreferences.h> |
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24 #include <alf/alfflowlayoutmanager.h> |
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25 #include <alf/ialfflowlayoutpolicy.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 #include "alfflowlayoutpreferencesimpl.h" |
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31 |
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32 using namespace Alf; |
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33 |
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34 namespace Alf |
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35 { |
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36 // ======== MEMBER FUNCTIONS ======== |
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37 |
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38 AlfFlowLayoutPreferencesImpl::AlfFlowLayoutPreferencesImpl( |
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39 AlfFlowLayoutManager& aFlowLayoutManager) : |
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40 mFlowLayoutManager(aFlowLayoutManager), mPreferredSize(TAlfMetric(0)) |
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41 { |
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42 } |
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43 // --------------------------------------------------------------------------- |
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44 // from IAlfLayoutPreferences |
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45 // Returns the minimum area that this layout manager can occupy by observing |
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46 // the minimum sizes of the child UI elements in the layout |
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47 // --------------------------------------------------------------------------- |
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48 // |
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49 bool AlfFlowLayoutPreferencesImpl::getMinimumSize(TAlfXYMetric& aMinSize) const |
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50 { |
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51 return calculateChildSizes(aMinSize, |
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52 flowLayoutPolicy().flowDirection(), ESizeMin); |
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53 } |
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54 |
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55 // --------------------------------------------------------------------------- |
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56 // from IAlfLayoutPreferences |
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57 // Returns the maximum area that this layout manager can occupy by observing |
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58 // the maximum sizes of the child UI elements in the layout |
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59 // --------------------------------------------------------------------------- |
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60 // |
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61 bool AlfFlowLayoutPreferencesImpl::getMaximumSize(TAlfXYMetric& aMaxSize) const |
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62 { |
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63 return calculateChildSizes(aMaxSize, |
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64 flowLayoutPolicy().flowDirection(), ESizeMax); |
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65 } |
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66 |
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67 // --------------------------------------------------------------------------- |
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68 // Combines and returns the preferred sizes of all child UI elements according |
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69 // to the layouting rules. |
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70 // --------------------------------------------------------------------------- |
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71 // |
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72 bool AlfFlowLayoutPreferencesImpl::getPreferredSize(TAlfXYMetric& aPreferredSize) const |
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73 { |
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74 bool b = false; |
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75 bool manualSet = (mPreferredSize.iX.iMagnitude > 0 && |
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76 mPreferredSize.iY.iMagnitude > 0); |
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77 |
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78 if (manualSet) |
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79 { |
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80 aPreferredSize = mPreferredSize; |
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81 b = true; |
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82 } |
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83 else |
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84 { |
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85 b = calculateChildSizes(aPreferredSize, |
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86 flowLayoutPolicy().flowDirection(), ESizePreferred); |
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87 } |
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88 return b; |
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89 } |
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90 |
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91 // --------------------------------------------------------------------------- |
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92 // from IAlfLayoutPreferences |
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93 // At the moment doesn't do anything since preferred size is being queried |
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94 // from the child UI elements added to this layout manager. |
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95 // --------------------------------------------------------------------------- |
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96 // |
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97 void AlfFlowLayoutPreferencesImpl::setPreferredSize( |
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98 const TAlfXYMetric& aPreferredSize ) |
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99 { |
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100 mPreferredSize = aPreferredSize; |
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101 mFlowLayoutManager.owner().updateParentLayout(); |
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102 } |
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103 |
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104 // --------------------------------------------------------------------------- |
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105 // From class IAlfInterfaceBase. |
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106 // Getter for interfaces provided by the element. |
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107 // --------------------------------------------------------------------------- |
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108 // |
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109 IAlfInterfaceBase* AlfFlowLayoutPreferencesImpl::makeInterface( |
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110 const IfId& aType) |
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111 { |
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112 UString param(aType.mImplementationId); |
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113 IAlfInterfaceBase* ret = 0; |
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114 if (param == IAlfLayoutPreferences::type().mImplementationId) |
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115 { |
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116 ret = static_cast<IAlfLayoutPreferences*>(this); |
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117 } |
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118 |
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119 return ret; |
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120 } |
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121 |
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122 // --------------------------------------------------------------------------- |
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123 // calculate the min-, preferred-, or max- sizes from the children. |
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124 // --------------------------------------------------------------------------- |
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125 // |
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126 bool AlfFlowLayoutPreferencesImpl::calculateChildSizes( |
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127 TAlfXYMetric& aSize, |
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128 enum IAlfFlowLayoutPolicy::flowDirection aFlowDirection, |
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129 enum AlfFlowLayoutPreferencesImpl::sizeType aSizeType) const |
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130 { |
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131 bool ret = false; |
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132 TAlfXYMetric resultSize(TAlfMetric(0), TAlfMetric(0)); |
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133 |
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134 // Iterate through all the child controls, and get their |
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135 // preferred sizes. |
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136 int childCount = mFlowLayoutManager.count(); |
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137 for (int i = 0; i < childCount; i++) |
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138 { |
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139 CAlfWidgetControl* childWidgetControl = mFlowLayoutManager.getControl(i); |
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140 |
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141 TAlfXYMetric size; |
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142 if (getSize(childWidgetControl, size, aSizeType)) |
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143 { |
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144 TAlfRealSize pixelSize = sizeInPixels(size); |
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145 |
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146 if (aFlowDirection == IAlfFlowLayoutPolicy::EFlowVertical) |
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147 { |
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148 //total width = max preferred width of child widgets. |
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149 //total height = sum of the preferred heights of child widgets. |
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150 if(pixelSize.iWidth > resultSize.iX.iMagnitude) |
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151 { |
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152 resultSize.iX.iMagnitude = pixelSize.iWidth; |
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153 } |
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154 resultSize.iY.iMagnitude += pixelSize.iHeight; |
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155 ret = true; |
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156 } |
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157 else |
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158 { |
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159 //horizontal flow direction |
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160 //total height = max preferred height of child widgets. |
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161 //total width = sum of the preferred widths of child widgets. |
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162 if(pixelSize.iHeight > resultSize.iY.iMagnitude) |
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163 { |
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164 resultSize.iY.iMagnitude = pixelSize.iHeight; |
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165 } |
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166 resultSize.iX.iMagnitude += pixelSize.iWidth; |
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167 ret = true; |
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168 } |
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169 } |
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170 } |
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171 |
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172 aSize = resultSize; |
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173 return ret; |
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174 } |
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175 |
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176 // --------------------------------------------------------------------------- |
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177 // fetches the size from the IAlfLayoutPreferences-interface of the aControl. |
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178 // --------------------------------------------------------------------------- |
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179 // |
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180 bool AlfFlowLayoutPreferencesImpl::getSize( |
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181 CAlfWidgetControl* aControl, |
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182 TAlfXYMetric& aSize, |
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183 enum AlfFlowLayoutPreferencesImpl::sizeType aSizeType) const |
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184 { |
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185 bool ret = false; |
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186 |
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187 if (aControl) |
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188 { |
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189 const IAlfLayoutPreferences* layoutPrefs = |
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190 mFlowLayoutManager.getLayoutPreferences(aControl); |
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191 |
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192 if (layoutPrefs) |
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193 { |
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194 switch(aSizeType) |
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195 { |
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196 case AlfFlowLayoutPreferencesImpl::ESizePreferred: |
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197 ret = layoutPrefs->getPreferredSize(aSize); |
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198 break; |
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199 case AlfFlowLayoutPreferencesImpl::ESizeMin: |
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200 ret = layoutPrefs->getMinimumSize(aSize); |
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201 break; |
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202 case AlfFlowLayoutPreferencesImpl::ESizeMax: |
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203 ret = layoutPrefs->getMaximumSize(aSize); |
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204 break; |
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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 return ret; |
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210 } |
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211 |
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212 // --------------------------------------------------------------------------- |
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213 // get the flowlayoutpolicy-interface. |
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214 // --------------------------------------------------------------------------- |
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215 // |
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216 const IAlfFlowLayoutPolicy& AlfFlowLayoutPreferencesImpl::flowLayoutPolicy() const |
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217 { |
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218 AlfFlowLayoutManager* man = |
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219 const_cast<AlfFlowLayoutManager*>(&mFlowLayoutManager); |
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220 IAlfFlowLayoutPolicy* policy = |
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221 IAlfInterfaceBase::makeInterface<IAlfFlowLayoutPolicy>(man); |
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222 assert(policy); |
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223 return *policy; |
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224 } |
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225 // --------------------------------------------------------------------------- |
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226 // converts size in metrics to size in pixels. |
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227 // implementation missing! |
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228 // --------------------------------------------------------------------------- |
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229 // |
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230 TAlfRealSize AlfFlowLayoutPreferencesImpl::sizeInPixels( |
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231 const TAlfXYMetric& aSize) |
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232 { |
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233 TAlfRealSize s; |
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234 |
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235 if(aSize.iX.iUnit == EAlfUnitPixel) |
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236 { |
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237 s.iWidth = aSize.iX.iMagnitude; |
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238 } |
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239 if(aSize.iY.iUnit == EAlfUnitPixel) |
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240 { |
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241 s.iHeight = aSize.iY.iMagnitude; |
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242 } |
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243 |
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244 return s; |
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245 } |
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246 } // Alf |
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