qTier/flowlayout.cpp

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include <QtWidgets>

#include "flowlayout.h"
#include "utils.hpp"

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()
{
    for (auto& child : itemList)
    {
        delete child;
        child = nullptr;
    }
    itemList.clear();
}

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
{
    qInfo() << "getting item list size";
    if (itemList.isEmpty())
        return 0;
    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);
    return nullptr;
}

Qt::Orientations FlowLayout::expandingDirections() const
{
    return { };
}

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;
    for (const QLayoutItem* item : std::as_const(itemList))
    {
        size = size.expandedTo(item->minimumSize());
    }
    const QMargins margins = contentsMargins();
    size += QSize(margins.left() + margins.right(), margins.top() + margins.bottom());
    auto minh = minimumHeight();
    if (size.height() < minh)
    {
        size.rheight() = minh;
    }
    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;
    for (QLayoutItem* item : std::as_const(itemList))
    {
        const 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())
    {
        QWidget* pw = static_cast<QWidget*>(parent);
        return pw->style()->pixelMetric(pm, nullptr, pw);
    }
    else
    {
        return static_cast<QLayout*>(parent)->spacing();
    }
}

void FlowLayout::setIndex(QWidget* wid, int index)
{
    qInfo() << "set index" << index;
    if (index < count() && itemAt(index)->widget() == wid)
        return;
    qInfo() << "past first check";
    IndexOutOfRangeException::ThrowIf(index, 0, {});
    qInfo() << "past second check";
    wid->setParent(nullptr);
    qInfo() << "cleared parent";
    addWidget(wid);
    qInfo() << "added widget";
    IndexOutOfRangeException::ThrowIf(index, {}, count()-1);
    qInfo() << "past third check";
    for (int i = count()-1; i > +1; i--)
    {
        qInfo() << "about to swap" << i-1 << "and" << i;
        //TODO excessive, should remove later
        IndexOutOfRangeException::ThrowIf(index, 0, count()-1);
        itemList.swapItemsAt(i-1, i);
    }
}

void FlowLayout::setMinimumHeight(int minh)
{
    _minimumHeight = minh;
}

int FlowLayout::minimumHeight() const
{
    return _minimumHeight;
}