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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2011 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 examples of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:BSD$ |
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10 ** You may use this file under the terms of the BSD license as follows: |
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11 ** |
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12 ** "Redistribution and use in source and binary forms, with or without |
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13 ** modification, are permitted provided that the following conditions are |
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14 ** met: |
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15 ** * Redistributions of source code must retain the above copyright |
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16 ** notice, this list of conditions and the following disclaimer. |
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17 ** * Redistributions in binary form must reproduce the above copyright |
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18 ** notice, this list of conditions and the following disclaimer in |
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19 ** the documentation and/or other materials provided with the |
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20 ** distribution. |
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21 ** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor |
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22 ** the names of its contributors may be used to endorse or promote |
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23 ** products derived from this software without specific prior written |
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24 ** permission. |
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25 ** |
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26 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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27 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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28 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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29 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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30 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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31 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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32 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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33 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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34 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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35 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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36 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
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37 ** $QT_END_LICENSE$ |
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38 ** |
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39 ****************************************************************************/ |
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40 |
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41 #include <QtGui> |
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42 |
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43 #include "flowlayout.h" |
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44 |
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45 FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing) |
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46 : QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing) |
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47 { |
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48 setContentsMargins(margin, margin, margin, margin); |
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49 } |
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50 |
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51 FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing) |
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52 : m_hSpace(hSpacing), m_vSpace(vSpacing) |
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53 { |
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54 setContentsMargins(margin, margin, margin, margin); |
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55 } |
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56 |
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57 FlowLayout::~FlowLayout() |
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58 { |
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59 QLayoutItem *item; |
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60 while ((item = takeAt(0))) |
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61 delete item; |
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62 } |
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63 |
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64 void FlowLayout::addItem(QLayoutItem *item) |
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65 { |
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66 itemList.append(item); |
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67 } |
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68 |
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69 int FlowLayout::horizontalSpacing() const |
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70 { |
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71 if (m_hSpace >= 0) { |
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72 return m_hSpace; |
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73 } else { |
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74 return smartSpacing(QStyle::PM_LayoutHorizontalSpacing); |
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75 } |
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76 } |
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77 |
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78 int FlowLayout::verticalSpacing() const |
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79 { |
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80 if (m_vSpace >= 0) { |
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81 return m_vSpace; |
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82 } else { |
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83 return smartSpacing(QStyle::PM_LayoutVerticalSpacing); |
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84 } |
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85 } |
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86 |
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87 int FlowLayout::count() const |
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88 { |
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89 return itemList.size(); |
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90 } |
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91 |
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92 QLayoutItem *FlowLayout::itemAt(int index) const |
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93 { |
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94 return itemList.value(index); |
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95 } |
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96 |
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97 QLayoutItem *FlowLayout::takeAt(int index) |
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98 { |
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99 if (index >= 0 && index < itemList.size()) |
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100 return itemList.takeAt(index); |
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101 else |
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102 return 0; |
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103 } |
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104 |
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105 Qt::Orientations FlowLayout::expandingDirections() const |
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106 { |
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107 return 0; |
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108 } |
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109 |
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110 bool FlowLayout::hasHeightForWidth() const |
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111 { |
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112 return true; |
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113 } |
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114 |
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115 int FlowLayout::heightForWidth(int width) const |
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116 { |
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117 int height = doLayout(QRect(0, 0, width, 0), true); |
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118 return height; |
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119 } |
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120 |
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121 void FlowLayout::setGeometry(const QRect &rect) |
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122 { |
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123 QLayout::setGeometry(rect); |
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124 doLayout(rect, false); |
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125 } |
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126 |
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127 QSize FlowLayout::sizeHint() const |
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128 { |
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129 return minimumSize(); |
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130 } |
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131 |
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132 QSize FlowLayout::minimumSize() const |
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133 { |
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134 QSize size; |
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135 QLayoutItem *item; |
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136 foreach (item, itemList) |
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137 size = size.expandedTo(item->minimumSize()); |
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138 |
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139 size += QSize(2*margin(), 2*margin()); |
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140 return size; |
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141 } |
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142 |
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143 int FlowLayout::doLayout(const QRect &rect, bool testOnly) const |
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144 { |
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145 int left, top, right, bottom; |
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146 getContentsMargins(&left, &top, &right, &bottom); |
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147 QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom); |
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148 int x = effectiveRect.x(); |
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149 int y = effectiveRect.y(); |
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150 int lineHeight = 0; |
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151 |
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152 QLayoutItem *item; |
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153 foreach (item, itemList) { |
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154 QWidget *wid = item->widget(); |
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155 int spaceX = horizontalSpacing(); |
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156 if (spaceX == -1) |
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157 spaceX = wid->style()->layoutSpacing( |
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158 QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal); |
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159 int spaceY = verticalSpacing(); |
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160 if (spaceY == -1) |
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161 spaceY = wid->style()->layoutSpacing( |
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162 QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical); |
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163 int nextX = x + item->sizeHint().width() + spaceX; |
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164 if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) { |
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165 x = effectiveRect.x(); |
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166 y = y + lineHeight + spaceY; |
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167 nextX = x + item->sizeHint().width() + spaceX; |
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168 lineHeight = 0; |
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169 } |
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170 |
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171 if (!testOnly) |
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172 item->setGeometry(QRect(QPoint(x, y), item->sizeHint())); |
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173 |
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174 x = nextX; |
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175 lineHeight = qMax(lineHeight, item->sizeHint().height()); |
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176 } |
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177 return y + lineHeight - rect.y() + bottom; |
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178 } |
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179 int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const |
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180 { |
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181 QObject *parent = this->parent(); |
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182 if (!parent) { |
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183 return -1; |
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184 } else if (parent->isWidgetType()) { |
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185 QWidget *pw = static_cast<QWidget *>(parent); |
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186 return pw->style()->pixelMetric(pm, 0, pw); |
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187 } else { |
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188 return static_cast<QLayout *>(parent)->spacing(); |
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189 } |
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190 } |