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https://github.com/tumic0/GPXSee.git
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182 lines
4.1 KiB
C++
182 lines
4.1 KiB
C++
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#include <QtWidgets>
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#include "flowlayout.h"
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struct FlowLayoutItem
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{
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FlowLayoutItem() : item(0) {}
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FlowLayoutItem(QLayoutItem *item, int x, int y) : item(item), pos(x, y) {}
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QLayoutItem *item;
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QPoint pos;
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};
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FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
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: QLayout(parent), _hSpace(hSpacing), _vSpace(vSpacing)
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{
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setContentsMargins(margin, margin, margin, margin);
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}
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FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
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: _hSpace(hSpacing), _vSpace(vSpacing)
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{
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setContentsMargins(margin, margin, margin, margin);
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}
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FlowLayout::~FlowLayout()
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{
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qDeleteAll(_items);
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}
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void FlowLayout::addItem(QLayoutItem *item)
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{
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_items.append(item);
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}
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int FlowLayout::horizontalSpacing() const
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{
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return (_hSpace >= 0)
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? _hSpace
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: smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
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}
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int FlowLayout::verticalSpacing() const
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{
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return (_vSpace >= 0)
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? _vSpace
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: smartSpacing(QStyle::PM_LayoutVerticalSpacing);
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}
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int FlowLayout::count() const
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{
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return _items.size();
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}
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QLayoutItem *FlowLayout::itemAt(int index) const
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{
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return _items.value(index);
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}
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QLayoutItem *FlowLayout::takeAt(int index)
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{
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if (index >= 0 && index < _items.size())
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return _items.takeAt(index);
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return 0;
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}
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Qt::Orientations FlowLayout::expandingDirections() const
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{
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return {};
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}
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bool FlowLayout::hasHeightForWidth() const
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{
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return true;
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}
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int FlowLayout::heightForWidth(int width) const
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{
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int height = doLayout(QRect(0, 0, width, 0), true);
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return height;
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}
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void FlowLayout::setGeometry(const QRect &rect)
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{
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QLayout::setGeometry(rect);
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doLayout(rect, false);
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}
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QSize FlowLayout::sizeHint() const
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{
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return minimumSize();
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}
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QSize FlowLayout::minimumSize() const
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{
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QSize size;
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for (int i = 0; i < _items.size(); i++)
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size = size.expandedTo(_items.at(i)->minimumSize());
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const QMargins margins = contentsMargins();
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size += QSize(margins.left() + margins.right(), margins.top()
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+ margins.bottom());
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return size;
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}
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int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
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{
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int left, top, right, bottom;
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getContentsMargins(&left, &top, &right, &bottom);
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QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
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int x = effectiveRect.x();
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int y = effectiveRect.y();
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int lineHeight = 0;
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QVector<QVector<FlowLayoutItem>> rows;
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if (!_items.isEmpty())
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rows.append(QVector<FlowLayoutItem>());
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for (int i = 0; i < _items.size(); i++) {
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QLayoutItem *item = _items.at(i);
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const QWidget *wid = item->widget();
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int spaceX = horizontalSpacing();
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if (spaceX == -1)
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spaceX = wid->style()->layoutSpacing(QSizePolicy::PushButton,
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QSizePolicy::PushButton, Qt::Horizontal);
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int spaceY = verticalSpacing();
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if (spaceY == -1)
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spaceY = wid->style()->layoutSpacing(QSizePolicy::PushButton,
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QSizePolicy::PushButton, Qt::Vertical);
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int nextX = x + item->sizeHint().width() + spaceX;
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if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) {
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x = effectiveRect.x();
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y = y + lineHeight + spaceY;
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nextX = x + item->sizeHint().width() + spaceX;
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lineHeight = 0;
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rows.append(QVector<FlowLayoutItem>());
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}
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rows.last().append(FlowLayoutItem(item, x, y));
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x = nextX;
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lineHeight = qMax(lineHeight, item->sizeHint().height());
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}
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if (!testOnly) {
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for (int i = 0; i < rows.size(); i++) {
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const FlowLayoutItem &li = rows.at(i).last();
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int width = li.item->sizeHint().width() + li.pos.x();
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int offset = (rect.width() - width) / 2;
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int height = 0;
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for (int j = 0; j < rows.at(i).size(); j++)
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height = qMax(rows.at(i).at(j).item->sizeHint().height(), height);
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for (int j = 0; j < rows.at(i).size(); j++) {
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QLayoutItem *item = rows.at(i).at(j).item;
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const QPoint &p = rows.at(i).at(j).pos;
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QSize sh(item->sizeHint());
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item->setGeometry(QRect(QPoint(p.x() + offset, p.y() + height
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- sh.height()), sh));
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}
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}
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}
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return y + lineHeight - rect.y() + bottom;
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}
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int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
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{
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QObject *parent = this->parent();
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if (!parent)
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return -1;
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else if (parent->isWidgetType()) {
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QWidget *pw = static_cast<QWidget *>(parent);
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return pw->style()->pixelMetric(pm, 0, pw);
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} else
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return static_cast<QLayout *>(parent)->spacing();
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}
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