gwenview/lib/flowlayout.cpp

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  37
  38 #include <QtGui>
  39
  40 #include "flowlayout.h"
  41
  42 FlowLayout::FlowLayout(QWidget *parent, int margin, int spacing)
  43     : QLayout(parent)
  44 {
  45     setMargin(margin);
  46     setSpacing(spacing);
  47 }
  48
  49 FlowLayout::FlowLayout(int spacing)
  50 {
  51     setSpacing(spacing);
  52 }
  53
  54 FlowLayout::~FlowLayout()
  55 {
  56     QLayoutItem *item;
  57     while ((item = takeAt(0)))
  58         delete item;
  59 }
  60
  61 void FlowLayout::addItem(QLayoutItem *item)
  62 {
  63     itemList.append(item);
  64 }
  65
  66 int FlowLayout::count() const
  67 {
  68     return itemList.size();
  69 }
  70
  71 QLayoutItem *FlowLayout::itemAt(int index) const
  72 {
  73     return itemList.value(index);
  74 }
  75
  76 QLayoutItem *FlowLayout::takeAt(int index)
  77 {
  78     if (index >= 0 && index < itemList.size())
  79         return itemList.takeAt(index);
  80     else
  81         return 0;
  82 }
  83
  84 Qt::Orientations FlowLayout::expandingDirections() const
  85 {
  86     return 0;
  87 }
  88
  89 bool FlowLayout::hasHeightForWidth() const
  90 {
  91     return true;
  92 }
  93
  94 int FlowLayout::heightForWidth(int width) const
  95 {
  96     int height = doLayout(QRect(0, 0, width, 0), true);
  97     return height;
  98 }
  99
 100 void FlowLayout::setGeometry(const QRect &rect)
 101 {
 102     QLayout::setGeometry(rect);
 103     doLayout(rect, false);
 104 }
 105
 106 QSize FlowLayout::sizeHint() const
 107 {
 108     return minimumSize();
 109 }
 110
 111 QSize FlowLayout::minimumSize() const
 112 {
 113     QSize size;
 114     QLayoutItem *item;
 115     foreach (item, itemList)
 116         size = size.expandedTo(item->minimumSize());
 117
 118     size += QSize(2*margin(), 2*margin());
 119     return size;
 120 }
 121
 122 int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
 123 {
 124     int x = rect.x();
 125     int y = rect.y();
 126     int lineHeight = 0;
 127
 128     QLayoutItem *item;
 129     foreach (item, itemList) {
 130         int nextX = x + item->sizeHint().width() + spacing();
 131         if (nextX - spacing() > rect.right() && lineHeight > 0) {
 132             x = rect.x();
 133             y = y + lineHeight + spacing();
 134             nextX = x + item->sizeHint().width() + spacing();
 135             lineHeight = 0;
 136         }
 137
 138         if (!testOnly)
 139             item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
 140
 141         x = nextX;
 142         lineHeight = qMax(lineHeight, item->sizeHint().height());
 143     }
 144     return y + lineHeight - rect.y();
 145 }