examples/layouts/borderlayout/borderlayout.cpp

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  41
  42 #include <QtGui>
  43
  44 #include "borderlayout.h"
  45
  46 BorderLayout::BorderLayout(QWidget *parent, int margin, int spacing)
  47     : QLayout(parent)
  48 {
  49     setMargin(margin);
  50     setSpacing(spacing);
  51 }
  52
  53 BorderLayout::BorderLayout(int spacing)
  54 {
  55     setSpacing(spacing);
  56 }
  57
  58
  59 BorderLayout::~BorderLayout()
  60 {
  61     QLayoutItem *l;
  62     while ((l = takeAt(0)))
  63         delete l;
  64 }
  65
  66 void BorderLayout::addItem(QLayoutItem *item)
  67 {
  68     add(item, West);
  69 }
  70
  71 void BorderLayout::addWidget(QWidget *widget, Position position)
  72 {
  73     add(new QWidgetItem(widget), position);
  74 }
  75
  76 Qt::Orientations BorderLayout::expandingDirections() const
  77 {
  78     return Qt::Horizontal | Qt::Vertical;
  79 }
  80
  81 bool BorderLayout::hasHeightForWidth() const
  82 {
  83     return false;
  84 }
  85
  86 int BorderLayout::count() const
  87 {
  88     return list.size();
  89 }
  90
  91 QLayoutItem *BorderLayout::itemAt(int index) const
  92 {
  93     ItemWrapper *wrapper = list.value(index);
  94     if (wrapper)
  95         return wrapper->item;
  96     else
  97         return 0;
  98 }
  99
 100 QSize BorderLayout::minimumSize() const
 101 {
 102     return calculateSize(MinimumSize);
 103 }
 104
 105 void BorderLayout::setGeometry(const QRect &rect)
 106 {
 107     ItemWrapper *center = 0;
 108     int eastWidth = 0;
 109     int westWidth = 0;
 110     int northHeight = 0;
 111     int southHeight = 0;
 112     int centerHeight = 0;
 113     int i;
 114
 115     QLayout::setGeometry(rect);
 116
 117     for (i = 0; i < list.size(); ++i) {
 118         ItemWrapper *wrapper = list.at(i);
 119         QLayoutItem *item = wrapper->item;
 120         Position position = wrapper->position;
 121
 122         if (position == North) {
 123             item->setGeometry(QRect(rect.x(), northHeight, rect.width(),
 124                                     item->sizeHint().height()));
 125
 126             northHeight += item->geometry().height() + spacing();
 127         } else if (position == South) {
 128             item->setGeometry(QRect(item->geometry().x(),
 129                                     item->geometry().y(), rect.width(),
 130                                     item->sizeHint().height()));
 131
 132             southHeight += item->geometry().height() + spacing();
 133
 134             item->setGeometry(QRect(rect.x(),
 135                               rect.y() + rect.height() - southHeight + spacing(),
 136                               item->geometry().width(),
 137                               item->geometry().height()));
 138         } else if (position == Center) {
 139             center = wrapper;
 140         }
 141     }
 142
 143     centerHeight = rect.height() - northHeight - southHeight;
 144
 145     for (i = 0; i < list.size(); ++i) {
 146         ItemWrapper *wrapper = list.at(i);
 147         QLayoutItem *item = wrapper->item;
 148         Position position = wrapper->position;
 149
 150         if (position == West) {
 151             item->setGeometry(QRect(rect.x() + westWidth, northHeight,
 152                                     item->sizeHint().width(), centerHeight));
 153
 154             westWidth += item->geometry().width() + spacing();
 155         } else if (position == East) {
 156             item->setGeometry(QRect(item->geometry().x(), item->geometry().y(),
 157                                     item->sizeHint().width(), centerHeight));
 158
 159             eastWidth += item->geometry().width() + spacing();
 160
 161             item->setGeometry(QRect(
 162                               rect.x() + rect.width() - eastWidth + spacing(),
 163                               northHeight, item->geometry().width(),
 164                               item->geometry().height()));
 165         }
 166     }
 167
 168     if (center)
 169         center->item->setGeometry(QRect(westWidth, northHeight,
 170                                         rect.width() - eastWidth - westWidth,
 171                                         centerHeight));
 172 }
 173
 174 QSize BorderLayout::sizeHint() const
 175 {
 176     return calculateSize(SizeHint);
 177 }
 178
 179 QLayoutItem *BorderLayout::takeAt(int index)
 180 {
 181     if (index >= 0 && index < list.size()) {
 182         ItemWrapper *layoutStruct = list.takeAt(index);
 183         return layoutStruct->item;
 184     }
 185     return 0;
 186 }
 187
 188 void BorderLayout::add(QLayoutItem *item, Position position)
 189 {
 190     list.append(new ItemWrapper(item, position));
 191 }
 192
 193 QSize BorderLayout::calculateSize(SizeType sizeType) const
 194 {
 195     QSize totalSize;
 196
 197     for (int i = 0; i < list.size(); ++i) {
 198         ItemWrapper *wrapper = list.at(i);
 199         Position position = wrapper->position;
 200         QSize itemSize;
 201
 202         if (sizeType == MinimumSize)
 203             itemSize = wrapper->item->minimumSize();
 204         else // (sizeType == SizeHint)
 205             itemSize = wrapper->item->sizeHint();
 206
 207         if (position == North || position == South || position == Center)
 208             totalSize.rheight() += itemSize.height();
 209
 210         if (position == West || position == East || position == Center)
 211             totalSize.rwidth() += itemSize.width();
 212     }
 213     return totalSize;
 214 }