File indexing completed on 2024-04-21 04:39:56

 /*
     SPDX-FileCopyrightText: 2006-2007 Sebastian Trueg <trueg@kde.org>
 
     KBlockLayout is based on the FlowLayout example from QT4.
     SPDX-FileCopyrightText: 2004-2006 Trolltech ASA
     SPDX-FileCopyrightText: 2010 Nokia Corporation and /or its subsidiary(-ies) <qt-info@nokia.com>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "kblocklayout.h"
 
 #include <QList>
 #include <QStyle>
 #include <QWidget>
 
 class KBlockLayout::Private
 {
 public:
     Private()
         : alignment(Qt::AlignLeft | Qt::AlignTop)
     {
     }
 
     int smartSpacing(QStyle::PixelMetric pm) const
     {
         QObject *parent = q->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();
         }
     }
 
     QList<QLayoutItem *> itemList;
 
     int m_hSpace;
     int m_vSpace;
 
     Qt::Alignment alignment;
 
     KBlockLayout *q = nullptr;
 };
 
 KBlockLayout::KBlockLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
     : QLayout(parent)
     , d(new Private())
 {
     d->q = this;
     setContentsMargins(margin, margin, margin, margin);
     setSpacing(hSpacing, vSpacing);
 }
 
 KBlockLayout::KBlockLayout(int margin, int hSpacing, int vSpacing)
     : d(new Private())
 {
     d->q = this;
     setContentsMargins(margin, margin, margin, margin);
     setSpacing(hSpacing, vSpacing);
 }
 
 KBlockLayout::~KBlockLayout()
 {
     QLayoutItem *item;
     while ((item = takeAt(0)))
         delete item;
     delete d;
 }
 
 void KBlockLayout::setAlignment(Qt::Alignment a)
 {
     d->alignment = a;
     QLayout::update();
 }
 
 Qt::Alignment KBlockLayout::alignment() const
 {
     return d->alignment;
 }
 
 int KBlockLayout::horizontalSpacing() const
 {
     if (d->m_hSpace >= 0) {
         return d->m_hSpace;
     } else {
         return d->smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
     }
 }
 
 int KBlockLayout::verticalSpacing() const
 {
     if (d->m_vSpace >= 0) {
         return d->m_vSpace;
     } else {
         return d->smartSpacing(QStyle::PM_LayoutVerticalSpacing);
     }
 }
 
 void KBlockLayout::setSpacing(int h, int v)
 {
     d->m_hSpace = h;
     d->m_vSpace = v;
     QLayout::setSpacing(h);
 }
 
 void KBlockLayout::addItem(QLayoutItem *item)
 {
     d->itemList.append(item);
 }
 
 int KBlockLayout::count() const
 {
     return d->itemList.size();
 }
 
 QLayoutItem *KBlockLayout::itemAt(int index) const
 {
     return d->itemList.value(index);
 }
 
 QLayoutItem *KBlockLayout::takeAt(int index)
 {
     if (index >= 0 && index < d->itemList.size())
         return d->itemList.takeAt(index);
     else
         return nullptr;
 }
 
 Qt::Orientations KBlockLayout::expandingDirections() const
 {
     return {};
 }
 
 bool KBlockLayout::hasHeightForWidth() const
 {
     return true;
 }
 
 int KBlockLayout::heightForWidth(int width) const
 {
     int height = doLayout(QRect(0, 0, width, 0), true);
     return height;
 }
 
 void KBlockLayout::setGeometry(const QRect &rect)
 {
     QLayout::setGeometry(rect);
     doLayout(rect, false);
 }
 
 int KBlockLayout::getMargin() const
 {
     int left, top, right, bottom;
     getContentsMargins(&left, &top, &right, &bottom);
     if (left == top && top == right && right == bottom) {
         return left;
     } else {
         return -1;
     }
 }
 
 QSize KBlockLayout::sizeHint() const
 {
     // TODO: try to get the items into a square
     QSize size;
     for (QLayoutItem *item : std::as_const(d->itemList)) {
         const QSize itemSize = item->minimumSize();
         size.rwidth() += itemSize.width();
         if (itemSize.height() > size.height()) {
             size.setHeight(itemSize.height());
         }
     }
 
     size.rwidth() += horizontalSpacing() * d->itemList.count();
     size += QSize(2 * getMargin(), 2 * getMargin());
     return size;
 }
 
 QSize KBlockLayout::minimumSize() const
 {
     QSize size;
     for (QLayoutItem *item : std::as_const(d->itemList)) {
         size = size.expandedTo(item->minimumSize());
     }
 
     size += QSize(2 * getMargin(), 2 * getMargin());
     return size;
 }
 
 struct Row {
     Row(const QList<QLayoutItem *> &i, int h, int w)
         : items(i)
         , height(h)
         , width(w)
     {
     }
 
     QList<QLayoutItem *> items;
     int height;
     int width;
 };
 
 int KBlockLayout::doLayout(const QRect &rect, bool testOnly) const
 {
     int x = rect.x();
     int y = rect.y();
     int lineHeight = 0;
 
     // 1. calculate lines
     QList<Row> rows;
     QList<QLayoutItem *> rowItems;
     for (int i = 0; i < d->itemList.count(); ++i) {
         QLayoutItem *item = d->itemList[i];
         int nextX = x + item->sizeHint().width() + horizontalSpacing();
         if (nextX - horizontalSpacing() > rect.right() && lineHeight > 0) {
             rows.append(Row(rowItems, lineHeight, x - horizontalSpacing()));
             rowItems.clear();
 
             x = rect.x();
             y = y + lineHeight + verticalSpacing();
             nextX = x + item->sizeHint().width() + horizontalSpacing();
             lineHeight = 0;
         }
 
         rowItems.append(item);
 
         x = nextX;
         lineHeight = qMax(lineHeight, item->sizeHint().height());
     }
     // append the last row
     rows.append(Row(rowItems, lineHeight, x - horizontalSpacing()));
 
     int finalHeight = y + lineHeight - rect.y();
     if (testOnly)
         return finalHeight;
 
     // 2. place the items
     y = rect.y();
     for (const Row &row : std::as_const(rows)) {
         x = rect.x();
         if (alignment() & Qt::AlignRight)
             x += (rect.width() - row.width);
         else if (alignment() & Qt::AlignHCenter)
             x += (rect.width() - row.width) / 2;
 
         for (QLayoutItem *item : std::as_const(row.items)) {
             int yy = y;
             if (alignment() & Qt::AlignBottom)
                 yy += (row.height - item->sizeHint().height());
             else if (alignment() & Qt::AlignVCenter)
                 yy += (row.height - item->sizeHint().height()) / 2;
             item->setGeometry(QRect(QPoint(x, yy), item->sizeHint()));
 
             x += item->sizeHint().width() + horizontalSpacing();
 
             if (alignment() & Qt::AlignJustify)
                 x += (rect.width() - row.width) / qMax(row.items.count() - 1, 1);
         }
 
         y = y + row.height + verticalSpacing();
     }
 
     return finalHeight;
 }