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/****************************************************************************
**
** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the example classes of the Qt Toolkit.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information
** to ensure GNU General Public Licensing requirements will be met:
** https://www.fsf.org/licensing/licenses/info/GPLv2.html and
** https://www.gnu.org/copyleft/gpl.html. In addition, as a special
** exception, Nokia gives you certain additional rights. These rights
** are described in the Nokia Qt GPL Exception version 1.3, included in
** the file GPL_EXCEPTION.txt in this package.
**
** Qt for Windows(R) Licensees
** As a special exception, Nokia, as the sole copyright holder for Qt
** Designer, grants users of the Qt/Eclipse Integration plug-in the
** right for the Qt/Eclipse Integration to link to functionality
** provided by Qt Designer and its related libraries.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
**
****************************************************************************/
// 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"