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