140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
#include "flowlayout.h"
|
|
|
|
#include <QWidget>
|
|
#include <utility>
|
|
|
|
FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
|
|
: QLayout(parent)
|
|
, m_hSpacing(hSpacing)
|
|
, m_vSpacing(vSpacing)
|
|
{
|
|
setContentsMargins(margin, margin, margin, margin);
|
|
}
|
|
|
|
FlowLayout::~FlowLayout()
|
|
{
|
|
QLayoutItem *item;
|
|
while ((item = takeAt(0))) {
|
|
delete item;
|
|
}
|
|
}
|
|
|
|
void FlowLayout::clear()
|
|
{
|
|
while (QLayoutItem *item = takeAt(0)) {
|
|
if (item->widget()) {
|
|
item->widget()->hide();
|
|
}
|
|
delete item;
|
|
}
|
|
}
|
|
|
|
void FlowLayout::addItem(QLayoutItem *item)
|
|
{
|
|
m_items.append(item);
|
|
}
|
|
|
|
int FlowLayout::count() const
|
|
{
|
|
return m_items.size();
|
|
}
|
|
|
|
QLayoutItem *FlowLayout::itemAt(int index) const
|
|
{
|
|
return m_items.value(index);
|
|
}
|
|
|
|
QLayoutItem *FlowLayout::takeAt(int index)
|
|
{
|
|
return (index >= 0 && index < m_items.size()) ? m_items.takeAt(index) : nullptr;
|
|
}
|
|
|
|
Qt::Orientations FlowLayout::expandingDirections() const
|
|
{
|
|
return Qt::Orientation(0);
|
|
}
|
|
|
|
bool FlowLayout::hasHeightForWidth() const
|
|
{
|
|
return true;
|
|
}
|
|
|
|
int FlowLayout::heightForWidth(int width) const
|
|
{
|
|
return doLayout(QRect(0, 0, width, 0), true);
|
|
}
|
|
|
|
void FlowLayout::setGeometry(const QRect &rect)
|
|
{
|
|
QLayout::setGeometry(rect);
|
|
doLayout(rect, false);
|
|
}
|
|
|
|
QSize FlowLayout::sizeHint() const
|
|
{
|
|
return minimumSize();
|
|
}
|
|
|
|
QSize FlowLayout::minimumSize() const
|
|
{
|
|
QSize size;
|
|
for (const QLayoutItem *item : std::as_const(m_items)) {
|
|
size = size.expandedTo(item->minimumSize());
|
|
}
|
|
const QMargins margins = contentsMargins();
|
|
size += QSize(margins.left() + margins.right(), margins.top() + margins.bottom());
|
|
return size;
|
|
}
|
|
|
|
int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
|
|
{
|
|
int x = rect.x();
|
|
int y = rect.y();
|
|
int lineHeight = 0;
|
|
|
|
for (QLayoutItem *item : std::as_const(m_items)) {
|
|
int spaceX = horizontalSpacing();
|
|
int spaceY = verticalSpacing();
|
|
int nextX = x + item->sizeHint().width() + spaceX;
|
|
|
|
if (nextX - spaceX > rect.right() && lineHeight > 0) {
|
|
x = rect.x();
|
|
y += lineHeight + spaceY;
|
|
nextX = x + item->sizeHint().width() + spaceX;
|
|
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();
|
|
}
|
|
|
|
int FlowLayout::horizontalSpacing() const
|
|
{
|
|
return (m_hSpacing >= 0) ? m_hSpacing : smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
|
|
}
|
|
|
|
int FlowLayout::verticalSpacing() const
|
|
{
|
|
return (m_vSpacing >= 0) ? m_vSpacing : smartSpacing(QStyle::PM_LayoutVerticalSpacing);
|
|
}
|
|
|
|
int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
|
|
{
|
|
QObject *parent = this->parent();
|
|
if (!parent) {
|
|
return -1;
|
|
} else if (parent->isWidgetType()) {
|
|
return static_cast<QWidget *>(parent)->style()->pixelMetric(pm,
|
|
nullptr,
|
|
static_cast<QWidget *>(parent));
|
|
} else {
|
|
return static_cast<QLayout *>(parent)->spacing();
|
|
}
|
|
}
|