// As per https://doc.qt.io/qt-6.5/qtwidgets-layouts-flowlayout-example.html
/*===========================================================================
==
== Copyright (C) 2016 The Qt Company Ltd.
== Contact: https://www.qt.io/licensing/
==
== This file is part of the examples of the Qt Toolkit.
==
== $QT_BEGIN_LICENSE:BSD$
== Commercial License Usage
== Licensees holding valid commercial Qt licenses may use this file in
== accordance with the commercial license agreement provided with the
== Software or, alternatively, in accordance with the terms contained in
== a written agreement between you and The Qt Company. For licensing terms
== and conditions see https://www.qt.io/terms-conditions. For further
== information use the contact form at https://www.qt.io/contact-us.
==
== BSD License Usage
== Alternatively, you may use this file under the terms of the BSD license
== as follows:
==
== "Redistribution and use in source and binary forms, with or without
== modification, are permitted provided that the following conditions are
== met:
== * Redistributions of source code must retain the above copyright
== notice, this list of conditions and the following disclaimer.
== * Redistributions in binary form must reproduce the above copyright
== notice, this list of conditions and the following disclaimer in
== the documentation and/or other materials provided with the
== distribution.
== * Neither the name of The Qt Company Ltd nor the names of its
== contributors may be used to endorse or promote products derived
== from this software without specific prior written permission.
==
==
== THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
== "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
== LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
== A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
== OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
== SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
== LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
== DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
== THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
== (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
== OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
==
== $QT_END_LICENSE$
==
===========================================================================*/
#pragma once
#include <QLayout>
#include <QMap> // RNC
#include <QRect>
#include <QStyle>
class FlowLayoutHfw : public QLayout
{
// Flow layout, as per FlowLayout Qt demo, but modified to support
// height-for-width better (better as in: word-wrapping labels etc. get the
// maximum width allowed, aiming for the minimum height).
// NOTE THAT THIS IS NOT A "TOP-LEVEL" HFW WIDGET THAT CAN RESIZE ITS
// PARENT WIDGET (compare BoxLayoutHfw, GridLayoutHfw). So it should be
// displayed within one of those.
Q_OBJECT // RNC
public:
explicit FlowLayoutHfw(QWidget* parent, int margin = -1,
int h_spacing = -1, int v_spacing = -1);
explicit FlowLayoutHfw(int margin = -1,
int h_spacing = -1, int v_spacing = -1);
~FlowLayoutHfw() override;
// QLayout supplies: void addWidget(QWidget* w); // no alignment option
// QVBoxLayout/QHBoxLayout supply:
// void addWidget(QWidget* widget, int stretch, Qt::Alignment alignment);
// Alignment does make sense, specifically top alignment.
void addWidget(QWidget* w); // RNC
void addWidget(QWidget* w, Qt::Alignment alignment); // RNC
virtual void addItem(QLayoutItem* item) override;
void setHorizontalAlignmentOfContents(Qt::Alignment halign);
virtual int horizontalSpacing() const;
virtual int verticalSpacing() const;
virtual Qt::Orientations expandingDirections() const override;
virtual bool hasHeightForWidth() const override;
virtual int heightForWidth(int) const override;
virtual int count() const override;
virtual QLayoutItem* itemAt(int index) const override;
virtual QSize minimumSize() const override;
virtual void setGeometry(const QRect& rect) override;
virtual QSize sizeHint() const override;
virtual QLayoutItem* takeAt(int index) override;
virtual void invalidate() override; // RNC
protected: // RNC (was private)
// The main thinking function.
virtual QSize doLayout(const QRect& rect, bool test_only) const;
// Autocalculate spacing between items when none is specified explicitly.
int smartSpacing(QStyle::PixelMetric pm) const;
// Vertical coordinate of a given item, taking into account vertical
// alignment.
int itemTop(int row_top, int item_height, int row_height,
Qt::Alignment valignment) const; // RNC
// Number of pixels to shift an entire row right, to satisfy the horizontal
// alignment.
int rowShiftToRight(int layout_width, int width_of_all_items) const;
QVector<QLayoutItem*> m_item_list; // our widgets
int m_h_space; // horizontal spacing between items
int m_v_space; // vertical spacing between rows
mutable QSize m_size_hint; // cached size hint
mutable QMap<int, int> m_width_to_height; // cached width-to-height map
Qt::Alignment m_halign; // horizontal alignment
struct ItemCalc {
QLayoutItem* item; // the layout item
QWidget* widget; // the widget
int layout_row; // the row number this item will sit in
QSize item_size; // the item's size
QPoint layout_cell_top_left; // the item's top-left coordinate
};
};