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 /****************************************************************************
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 ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information (qt-info@nokia.com)
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 ** This file is part of the example classes of the Qt Toolkit.
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 // Self
 #include "flowlayout.h"
 
 // Qt
 #include <QHash>
 
 FlowLayout::FlowLayout(QWidget *parent, int margin, int spacing)
     : QLayout(parent)
 {
     setContentsMargins(margin, margin, margin, margin);
     setHorizontalSpacing(spacing);
     setVerticalSpacing(spacing);
 }
 
 FlowLayout::FlowLayout(int spacing)
 {
     setHorizontalSpacing(spacing);
     setVerticalSpacing(spacing);
 }
 
 FlowLayout::~FlowLayout()
 {
     QLayoutItem *item;
     while ((item = takeAt(0)))
         delete item;
 }
 
 int FlowLayout::horizontalSpacing() const
 {
     return mHorizontalSpacing;
 }
 
 void FlowLayout::setHorizontalSpacing(const int spacing)
 {
     mHorizontalSpacing = spacing;
 }
 
 int FlowLayout::verticalSpacing() const
 {
     return mVerticalSpacing;
 }
 
 void FlowLayout::setVerticalSpacing(const int spacing)
 {
     mVerticalSpacing = spacing;
 }
 
 void FlowLayout::addItem(QLayoutItem *item)
 {
     itemList.append(item);
 }
 
 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
 {
     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();
 }
 
 int FlowLayout::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 FlowLayout::minimumSize() const
 {
     QSize size;
     for (QLayoutItem *item : qAsConst(itemList))
         size = size.expandedTo(item->minimumSize());
 
     size += QSize(2 * getMargin(), 2 * getMargin());
     return size;
 }
 
 void FlowLayout::addSpacing(const int size)
 {
     addItem(new QSpacerItem(size, 0, QSizePolicy::Fixed, QSizePolicy::Minimum));
 }
 
 int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
 {
     const int left = rect.x() + getMargin();
     int x = left;
     int y = rect.y() + getMargin();
     int lineHeight = 0;
     bool lastItemIsSpacer = false;
     QHash<int, int> widthForY;
 
     for (QLayoutItem *item : qAsConst(itemList)) {
         const bool itemIsSpacer = item->spacerItem() != nullptr;
         // Don't add invisible items or succeeding spacer items
         if (item->sizeHint().width() == 0 || (itemIsSpacer && lastItemIsSpacer)) {
             continue;
         }
 
         int nextX = x + item->sizeHint().width() + horizontalSpacing();
         if (nextX - horizontalSpacing() > rect.right() - getMargin() && lineHeight > 0) {
             x = left;
             y = y + lineHeight + verticalSpacing();
             nextX = x + item->sizeHint().width() + horizontalSpacing();
             lineHeight = 0;
         }
 
         // Don't place spacer items at start of line
         if (itemIsSpacer && x == left) {
             continue;
         }
 
         if (!testOnly)
             item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
 
         x = nextX;
         // Don't add spacer items at end of line
         if (!itemIsSpacer) {
             widthForY[y] = x - getMargin();
         }
         lineHeight = qMax(lineHeight, item->sizeHint().height());
         lastItemIsSpacer = itemIsSpacer;
     }
 
     if (!testOnly) {
         const int contentWidth = rect.width() - 2 * getMargin();
         for (auto item : itemList) {
             QRect itemRect = item->geometry();
             // Center lines horizontally if flag AlignHCenter is set
             if (alignment() & Qt::AlignHCenter) {
                 if (widthForY.contains(itemRect.y())) {
                     const int offset = (contentWidth - widthForY[itemRect.y()]) / 2;
                     itemRect.translate(offset, 0);
                 }
             }
             // Center items vertically if flag AlignVCenter is set
             if (alignment() & Qt::AlignVCenter) {
                 const int offset = (lineHeight - itemRect.height()) / 2;
                 itemRect.translate(0, offset);
             }
             item->setGeometry(itemRect);
         }
     }
 
     return y + lineHeight - rect.y() + getMargin();
 }
 
 #include "moc_flowlayout.cpp"