File indexing completed on 2024-04-21 04:52:29

 /*
     SPDX-FileCopyrightText: 2013 Digia Plc and /or its subsidiary(-ies) <http://www.qt-project.org/legal>
     SPDX-License-Identifier: BSD-3-Clause
     This file is part of the examples of the Qt Toolkit.
 */
 
 #include "flowlayout.h"
 #include <QDebug>
 #include <QTimer>
 #include <QWidget>
 #include <QtMath>
 
 FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
     : QLayout(parent)
     , m_hSpace(hSpacing)
     , m_vSpace(vSpacing)
     , m_minimumSize(200, 200)
 {
     setContentsMargins(margin, margin, margin, margin);
 }
 
 FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
     : m_hSpace(hSpacing)
     , m_vSpace(vSpacing)
     , m_minimumSize(200, 200)
 {
     setContentsMargins(margin, margin, margin, margin);
 }
 
 FlowLayout::~FlowLayout()
 {
     QLayoutItem *item;
     while ((item = takeAt(0)) != nullptr) {
         delete item;
     }
 }
 
 void FlowLayout::addItem(QLayoutItem *item)
 {
     m_itemList.append(item);
 }
 
 int FlowLayout::horizontalSpacing() const
 {
     if (m_hSpace >= 0) {
         return m_hSpace;
     }
     return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
 }
 
 int FlowLayout::verticalSpacing() const
 {
     if (m_vSpace >= 0) {
         return m_vSpace;
     }
     return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
 }
 
 int FlowLayout::count() const
 {
     return m_itemList.size();
 }
 
 QLayoutItem *FlowLayout::itemAt(int index) const
 {
     return m_itemList.value(index);
 }
 
 QLayoutItem *FlowLayout::takeAt(int index)
 {
     if (index >= 0 && index < m_itemList.size()) {
         return m_itemList.takeAt(index);
     }
     return nullptr;
 }
 
 Qt::Orientations FlowLayout::expandingDirections() const
 {
     return Qt::Horizontal | Qt::Vertical;
 }
 
 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)
 {
     if (m_itemList.size() < 3) {
         return;
     }
     doLayout(rect, false);
     QLayout::setGeometry(rect);
 }
 
 QSize FlowLayout::sizeHint() const
 {
     return m_minimumSize;
 }
 
 QSize FlowLayout::minimumSize() const
 {
     return m_minimumSize;
 }
 
 int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
 {
     QMargins mrg = contentsMargins();
     QRect effectiveRect = rect.adjusted(mrg.left(), mrg.top(), -mrg.right(), -mrg.bottom());
     if (m_itemList.isEmpty() || effectiveRect.width() <= 0) {
         return 0;
     }
     int x = effectiveRect.x();
     int y = effectiveRect.y();
     int itemCount = 0;
     QWidget *wid = m_itemList.at(0)->widget();
     QSize min = wid->minimumSize();
     int columns = qMin(qFloor(double(rect.width()) / min.width()), m_itemList.size());
     columns = qMax(1, columns);
     int realWidth = qMin(wid->maximumWidth(), rect.width() / columns - horizontalSpacing());
     realWidth -= realWidth % 40;
     realWidth = qMax(realWidth, wid->minimumWidth());
     int totalHeight = y - rect.y() + mrg.bottom() + qCeil(double(m_itemList.size()) / columns) * (realWidth + verticalSpacing());
     m_minimumSize = QSize(columns * realWidth, totalHeight);
     QSize hint = QSize(realWidth, realWidth);
     if (testOnly) {
         return totalHeight;
     }
     for (QLayoutItem *item : m_itemList) {
         // We consider all items have the same dimensions
         item->setGeometry(QRect(QPoint(x, y), hint));
         itemCount++;
         // qDebug()<<"=== ITEM: "<<itemCount<<", POS: "<<x<<"x"<<y<<", SIZE: "<<hint;
         x = effectiveRect.x() + (itemCount % columns) * (realWidth + horizontalSpacing());
         y = effectiveRect.y() + qFloor(double(itemCount) / columns) * (realWidth + verticalSpacing());
     }
     return totalHeight;
 }
 int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
 {
     QObject *parent = this->parent();
     if (!parent) {
         return -1;
     }
     if (parent->isWidgetType()) {
         auto *pw = static_cast<QWidget *>(parent);
         return pw->style()->pixelMetric(pm, nullptr, pw);
     }
     return static_cast<QLayout *>(parent)->spacing();
 }
 
 int FlowLayout::miniHeight() const
 {
     return m_minimumSize.height();
 }