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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtGui module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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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 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include "qglobal.h" |
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43 |
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44 #ifndef QT_NO_GRAPHICSVIEW |
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45 |
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46 #include "qgraphicslayout_p.h" |
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47 #include "qgraphicslayout.h" |
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48 #include "qgraphicswidget.h" |
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49 #include "qapplication.h" |
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50 |
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51 QT_BEGIN_NAMESPACE |
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52 |
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53 /*! |
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54 \internal |
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55 |
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56 \a mw is the new parent. all items in the layout will be a child of \a mw. |
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57 */ |
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58 void QGraphicsLayoutPrivate::reparentChildItems(QGraphicsItem *newParent) |
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59 { |
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60 Q_Q(QGraphicsLayout); |
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61 int n = q->count(); |
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62 //bool mwVisible = mw && mw->isVisible(); |
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63 for (int i = 0; i < n; ++i) { |
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64 QGraphicsLayoutItem *layoutChild = q->itemAt(i); |
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65 if (!layoutChild) { |
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66 // Skip stretch items |
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67 continue; |
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68 } |
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69 if (layoutChild->isLayout()) { |
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70 QGraphicsLayout *l = static_cast<QGraphicsLayout*>(layoutChild); |
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71 l->d_func()->reparentChildItems(newParent); |
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72 } else if (QGraphicsItem *itemChild = layoutChild->graphicsItem()){ |
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73 QGraphicsItem *childParent = itemChild->parentItem(); |
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74 #ifdef QT_DEBUG |
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75 if (childParent && childParent != newParent && itemChild->isWidget() && qt_graphicsLayoutDebug()) { |
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76 QGraphicsWidget *w = static_cast<QGraphicsWidget*>(layoutChild); |
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77 qWarning("QGraphicsLayout::addChildLayout: widget %s \"%s\" in wrong parent; moved to correct parent", |
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78 w->metaObject()->className(), w->objectName().toLocal8Bit().constData()); |
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79 } |
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80 #endif |
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81 if (childParent != newParent) |
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82 itemChild->setParentItem(newParent); |
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83 } |
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84 } |
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85 } |
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86 |
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87 void QGraphicsLayoutPrivate::getMargin(qreal *result, qreal userMargin, QStyle::PixelMetric pm) const |
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88 { |
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89 if (!result) |
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90 return; |
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91 Q_Q(const QGraphicsLayout); |
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92 |
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93 QGraphicsLayoutItem *parent = q->parentLayoutItem(); |
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94 if (userMargin >= 0.0) { |
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95 *result = userMargin; |
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96 } else if (!parent) { |
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97 *result = 0.0; |
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98 } else if (parent->isLayout()) { // sublayouts have 0 margin by default |
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99 *result = 0.0; |
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100 } else { |
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101 *result = 0.0; |
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102 if (QGraphicsItem *layoutParentItem = parentItem()) { |
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103 if (layoutParentItem->isWidget()) |
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104 *result = (qreal)static_cast<QGraphicsWidget*>(layoutParentItem)->style()->pixelMetric(pm, 0); |
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105 } |
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106 } |
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107 } |
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108 |
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109 Qt::LayoutDirection QGraphicsLayoutPrivate::visualDirection() const |
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110 { |
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111 if (QGraphicsItem *maybeWidget = parentItem()) { |
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112 if (maybeWidget->isWidget()) |
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113 return static_cast<QGraphicsWidget*>(maybeWidget)->layoutDirection(); |
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114 } |
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115 return QApplication::layoutDirection(); |
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116 } |
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117 |
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118 static bool removeLayoutItemFromLayout(QGraphicsLayout *lay, QGraphicsLayoutItem *layoutItem) |
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119 { |
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120 if (!lay) |
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121 return false; |
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122 |
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123 for (int i = lay->count() - 1; i >= 0; --i) { |
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124 QGraphicsLayoutItem *child = lay->itemAt(i); |
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125 if (child && child->isLayout()) { |
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126 if (removeLayoutItemFromLayout(static_cast<QGraphicsLayout*>(child), layoutItem)) |
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127 return true; |
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128 } else if (child == layoutItem) { |
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129 lay->removeAt(i); |
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130 return true; |
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131 } |
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132 } |
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133 return false; |
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134 } |
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135 |
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136 /*! |
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137 \internal |
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138 |
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139 This function is called from subclasses to add a layout item \a layoutItem |
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140 to a layout. |
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141 |
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142 It takes care of automatically reparenting graphics items, if needed. |
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143 |
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144 If \a layoutItem is a is already in a layout, it will remove it from that layout. |
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145 |
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146 */ |
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147 void QGraphicsLayoutPrivate::addChildLayoutItem(QGraphicsLayoutItem *layoutItem) |
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148 { |
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149 Q_Q(QGraphicsLayout); |
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150 if (QGraphicsLayoutItem *maybeLayout = layoutItem->parentLayoutItem()) { |
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151 if (maybeLayout->isLayout()) |
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152 removeLayoutItemFromLayout(static_cast<QGraphicsLayout*>(maybeLayout), layoutItem); |
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153 } |
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154 layoutItem->setParentLayoutItem(q); |
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155 if (layoutItem->isLayout()) { |
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156 if (QGraphicsItem *parItem = parentItem()) { |
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157 static_cast<QGraphicsLayout*>(layoutItem)->d_func()->reparentChildItems(parItem); |
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158 } |
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159 } else { |
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160 if (QGraphicsItem *item = layoutItem->graphicsItem()) { |
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161 QGraphicsItem *newParent = parentItem(); |
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162 QGraphicsItem *oldParent = item->parentItem(); |
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163 if (oldParent == newParent || !newParent) |
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164 return; |
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165 |
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166 #ifdef QT_DEBUG |
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167 if (oldParent && item->isWidget()) { |
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168 QGraphicsWidget *w = static_cast<QGraphicsWidget*>(item); |
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169 qWarning("QGraphicsLayout::addChildLayoutItem: %s \"%s\" in wrong parent; moved to correct parent", |
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170 w->metaObject()->className(), w->objectName().toLocal8Bit().constData()); |
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171 } |
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172 #endif |
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173 |
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174 item->setParentItem(newParent); |
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175 } |
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176 } |
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177 } |
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178 |
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179 void QGraphicsLayoutPrivate::activateRecursive(QGraphicsLayoutItem *item) |
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180 { |
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181 if (item->isLayout()) { |
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182 QGraphicsLayout *layout = static_cast<QGraphicsLayout *>(item); |
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183 if (layout->d_func()->activated) |
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184 layout->invalidate(); |
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185 |
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186 for (int i = layout->count() - 1; i >= 0; --i) { |
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187 QGraphicsLayoutItem *childItem = layout->itemAt(i); |
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188 if (childItem) |
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189 activateRecursive(childItem); |
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190 } |
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191 layout->d_func()->activated = true; |
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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 QT_END_NAMESPACE |
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197 |
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198 #endif //QT_NO_GRAPHICSVIEW |