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+/****************************************************************************
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+**
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+** Copyright (C) 2016 The Qt Company Ltd.
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+** Contact: https://www.qt.io/licensing/
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+**
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+** This file is part of the examples of the Qt Toolkit.
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+**
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+** $QT_BEGIN_LICENSE:BSD$
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+** Commercial License Usage
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+** Licensees holding valid commercial Qt licenses may use this file in
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+** accordance with the commercial license agreement provided with the
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+** Software or, alternatively, in accordance with the terms contained in
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+** a written agreement between you and The Qt Company. For licensing terms
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+** and conditions see https://www.qt.io/terms-conditions. For further
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+** information use the contact form at https://www.qt.io/contact-us.
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+**
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+** BSD License Usage
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+** Alternatively, you may use this file under the terms of the BSD license
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+** as follows:
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+**
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+** "Redistribution and use in source and binary forms, with or without
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+** modification, are permitted provided that the following conditions are
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+** met:
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+** * Redistributions of source code must retain the above copyright
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+** notice, this list of conditions and the following disclaimer.
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+** * Redistributions in binary form must reproduce the above copyright
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+** notice, this list of conditions and the following disclaimer in
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+** the documentation and/or other materials provided with the
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+** distribution.
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+** * Neither the name of The Qt Company Ltd nor the names of its
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+** contributors may be used to endorse or promote products derived
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+** from this software without specific prior written permission.
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+**
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+**
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+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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+**
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+** $QT_END_LICENSE$
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+**
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+****************************************************************************/
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+
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+#include <QtWidgets>
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+
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+#include "flowlayout.h"
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+//! [1]
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+FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
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+ : QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing)
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+{
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+ setContentsMargins(margin, margin, margin, margin);
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+}
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+
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+FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
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+ : m_hSpace(hSpacing), m_vSpace(vSpacing)
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+{
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+ setContentsMargins(margin, margin, margin, margin);
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+}
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+//! [1]
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+
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+//! [2]
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+FlowLayout::~FlowLayout()
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+{
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+ QLayoutItem *item;
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+ while ((item = takeAt(0)))
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+ delete item;
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+}
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+//! [2]
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+
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+//! [3]
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+void FlowLayout::addItem(QLayoutItem *item)
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+{
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+ itemList.append(item);
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+}
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+//! [3]
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+
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+//! [4]
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+int FlowLayout::horizontalSpacing() const
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+{
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+ if (m_hSpace >= 0) {
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+ return m_hSpace;
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+ } else {
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+ return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
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+ }
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+}
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+
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+int FlowLayout::verticalSpacing() const
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+{
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+ if (m_vSpace >= 0) {
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+ return m_vSpace;
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+ } else {
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+ return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
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+ }
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+}
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+//! [4]
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+
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+//! [5]
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+int FlowLayout::count() const
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+{
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+ return itemList.size();
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+}
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+
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+QLayoutItem *FlowLayout::itemAt(int index) const
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+{
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+ return itemList.value(index);
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+}
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+
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+QLayoutItem *FlowLayout::takeAt(int index)
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+{
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+ if (index >= 0 && index < itemList.size())
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+ return itemList.takeAt(index);
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+ else
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+ return 0;
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+}
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+//! [5]
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+
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+//! [6]
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+Qt::Orientations FlowLayout::expandingDirections() const
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+{
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+ return 0;
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+}
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+//! [6]
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+
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+//! [7]
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+bool FlowLayout::hasHeightForWidth() const
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+{
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+ return true;
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+}
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+
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+int FlowLayout::heightForWidth(int width) const
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+{
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+ int height = doLayout(QRect(0, 0, width, 0), true);
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+ return height;
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+}
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+//! [7]
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+
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+//! [8]
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+void FlowLayout::setGeometry(const QRect &rect)
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+{
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+ QLayout::setGeometry(rect);
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+ doLayout(rect, false);
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+}
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+
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+QSize FlowLayout::sizeHint() const
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+{
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+ return minimumSize();
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+}
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+
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+QSize FlowLayout::minimumSize() const
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+{
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+ QSize size;
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+ QLayoutItem *item;
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+ foreach (item, itemList)
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+ size = size.expandedTo(item->minimumSize());
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+
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+ size += QSize(2*margin(), 2*margin());
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+ return size;
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+}
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+//! [8]
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+
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+/**
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+ * @brief 布局item
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+ *
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+ * @param rect
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+ * @param testOnly
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+ * @return int
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+ */
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+int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
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+{
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+ int left, top, right, bottom;
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+ /* 获取布局的margins */
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+ getContentsMargins(&left, &top, &right, &bottom);
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+ QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
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+ int x = effectiveRect.x();
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+ int y = effectiveRect.y();
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+ int lineHeight = 0;
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+//! [9]
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+
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+//! [10]
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+ /* 挨个排列组件，如果被隐藏了，那么也去掉前面的spacing距离 */
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+ QLayoutItem *item;
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+ foreach (item, itemList)
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+ {
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+ QWidget *wid = item->widget();
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+ int spaceX = horizontalSpacing();
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+ if (spaceX == -1)
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+ spaceX = wid->style()->layoutSpacing(
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+ QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
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+ int spaceY = verticalSpacing();
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+ if (spaceY == -1)
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+ spaceY = wid->style()->layoutSpacing(
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+ QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
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+//! [10]
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+//! [11]
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+ int nextX = x + item->sizeHint().width() + spaceX;
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+ if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) {
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+ x = effectiveRect.x();
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+ y = y + lineHeight + spaceY;
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+ nextX = x + item->sizeHint().width() + spaceX;
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+ lineHeight = 0;
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+ }
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+ /* 不是test就设置位置 */
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+ if (!testOnly)
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+ item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
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+
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+ x = nextX;
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+ lineHeight = qMax(lineHeight, item->sizeHint().height());
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+ }
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+ return y + lineHeight - rect.y() + bottom;
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+}
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+//! [11]
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+//! [12]
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+int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
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+{
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+ QObject *parent = this->parent();
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+ if (!parent) {
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+ return -1;
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+ } else if (parent->isWidgetType()) {
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+ QWidget *pw = static_cast<QWidget *>(parent);
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+ return pw->style()->pixelMetric(pm, 0, pw);
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+ } else {
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+ return static_cast<QLayout *>(parent)->spacing();
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+ }
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+}
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+//! [12]
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apple