flowlayout.cpp Example File
layouts/flowlayout/flowlayout.cpp
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** This file is part of the documentation of the Qt Toolkit.
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#include <QtGui>
#include "flowlayout.h"
FlowLayout::FlowLayout(QWidget *parent, int margin, int spacing)
: QLayout(parent)
{
setMargin(margin);
setSpacing(spacing);
}
FlowLayout::FlowLayout(int spacing)
{
setSpacing(spacing);
}
FlowLayout::~FlowLayout()
{
QLayoutItem *item;
while ((item = takeAt(0)))
delete item;
}
void FlowLayout::addItem(QLayoutItem *item)
{
itemList.append(item);
}
int FlowLayout::count() const
{
return itemList.size();
}
QLayoutItem *FlowLayout::itemAt(int index) const
{
return itemList.value(index);
}
QLayoutItem *FlowLayout::takeAt(int index)
{
if (index >= 0 && index < itemList.size())
return itemList.takeAt(index);
else
return 0;
}
Qt::Orientations FlowLayout::expandingDirections() const
{
return 0;
}
bool FlowLayout::hasHeightForWidth() const
{
return true;
}
int FlowLayout::heightForWidth(int width) const
{
int height = doLayout(QRect(0, 0, width, 0), true);
return height;
}
void FlowLayout::setGeometry(const QRect &rect)
{
QLayout::setGeometry(rect);
doLayout(rect, false);
}
QSize FlowLayout::sizeHint() const
{
return minimumSize();
}
QSize FlowLayout::minimumSize() const
{
QSize size;
QLayoutItem *item;
foreach (item, itemList)
size = size.expandedTo(item->minimumSize());
size += QSize(2*margin(), 2*margin());
return size;
}
int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
{
int x = rect.x();
int y = rect.y();
int lineHeight = 0;
QLayoutItem *item;
foreach (item, itemList) {
int nextX = x + item->sizeHint().width() + spacing();
if (nextX - spacing() > rect.right() && lineHeight > 0) {
x = rect.x();
y = y + lineHeight + spacing();
nextX = x + item->sizeHint().width() + spacing();
lineHeight = 0;
}
if (!testOnly)
item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
x = nextX;
lineHeight = qMax(lineHeight, item->sizeHint().height());
}
return y + lineHeight - rect.y();
}