flowlayout.cpp

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/*
 * SPDX-FileCopyrightText: 2006-2021 Istituto Italiano di Tecnologia (IIT)
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */
 
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#include <QtWidgets>
 
#include "flowlayout.h"
 
FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
    : QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing)
{
    setContentsMargins(margin, margin, margin, margin);
}
 
FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
    : m_hSpace(hSpacing), m_vSpace(vSpacing)
{
    setContentsMargins(margin, margin, margin, margin);
}
 
 
 
FlowLayout::~FlowLayout()
{
    QLayoutItem *item;
    while ((item = takeAt(0))) {
        delete item;
    }
}
 
 
 
void FlowLayout::addItem(QLayoutItem *item)
{
    itemList.append(item);
}
 
 
 
int FlowLayout::horizontalSpacing() const
{
    if (m_hSpace >= 0) {
        return m_hSpace;
    } else {
        return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
    }
}
 
int FlowLayout::verticalSpacing() const
{
    if (m_vSpace >= 0) {
        return m_vSpace;
    } else {
        return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
    }
}
 
 
 
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 nullptr;
    }
}
 
 
 
Qt::Orientations FlowLayout::expandingDirections() const
{
#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
    return {};
#else
    return nullptr;
#endif
}
 
 
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 left, top, right, bottom;
    getContentsMargins(&left, &top, &right, &bottom);
    QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
    int x = effectiveRect.x();
    int y = effectiveRect.y();
    int lineHeight = 0;
 
    QLayoutItem *item;
    foreach (item, itemList) {
        QWidget *wid = item->widget();
        int spaceX = horizontalSpacing();
        if (spaceX == -1) {
            spaceX = wid->style()->layoutSpacing(
                QSizePolicy::PushButton,
                QSizePolicy::PushButton,
                Qt::Horizontal);
        }
        int spaceY = verticalSpacing();
        if (spaceY == -1) {
            spaceY = wid->style()->layoutSpacing(
                QSizePolicy::PushButton,
                QSizePolicy::PushButton,
                Qt::Vertical);
        }
 
        int nextX = x + item->sizeHint().width() + spaceX;
        if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) {
            x = effectiveRect.x();
            y = 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() + bottom;
}
 
int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
{
    QObject *parent = this->parent();
    if (!parent) {
        return -1;
    } else if (parent->isWidgetType()) {
        auto* pw = static_cast<QWidget *>(parent);
        return pw->style()->pixelMetric(pm, nullptr, pw);
    } else {
        return static_cast<QLayout *>(parent)->spacing();
    }
}