Clementine-audio-player-Mac.../src/ui/flowlayout.cpp

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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
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** 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 Nokia Corporation and its Subsidiary(-ies) 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
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****************************************************************************/
#include "flowlayout.h"
2020-09-18 16:15:19 +02:00
#include <QWidget>
//! [1]
FlowLayout::FlowLayout(QWidget* parent, int margin, int hSpacing, int vSpacing)
: QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing) {
setContentsMargins(margin, margin, margin, margin);
}
FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
: m_hSpace(hSpacing), m_vSpace(vSpacing) {
setContentsMargins(margin, margin, margin, margin);
}
//! [1]
//! [2]
FlowLayout::~FlowLayout() {
QLayoutItem* item;
while ((item = takeAt(0))) delete item;
}
//! [2]
//! [3]
void FlowLayout::addItem(QLayoutItem* item) { itemList.append(item); }
//! [3]
//! [4]
int FlowLayout::horizontalSpacing() const {
if (m_hSpace >= 0) {
return m_hSpace;
} else {
return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
}
}
int FlowLayout::verticalSpacing() const {
if (m_vSpace >= 0) {
return m_vSpace;
} else {
return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
}
}
//! [4]
//! [5]
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 0;
}
//! [5]
//! [6]
Qt::Orientations FlowLayout::expandingDirections() const { return 0; }
//! [6]
//! [7]
bool FlowLayout::hasHeightForWidth() const { return true; }
int FlowLayout::heightForWidth(int width) const {
int height = doLayout(QRect(0, 0, width, 0), true);
return height;
}
//! [7]
//! [8]
void FlowLayout::setGeometry(const QRect& rect) {
QLayout::setGeometry(rect);
doLayout(rect, false);
}
QSize FlowLayout::sizeHint() const { return minimumSize(); }
QSize FlowLayout::minimumSize() const {
QSize size;
for (QLayoutItem* item : itemList)
size = size.expandedTo(item->minimumSize());
size += QSize(2 * margin(), 2 * margin());
return size;
}
//! [8]
//! [9]
int FlowLayout::doLayout(const QRect& rect, bool testOnly) const {
int left, top, right, bottom;
getContentsMargins(&left, &top, &right, &bottom);
QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
int x = effectiveRect.x();
int y = effectiveRect.y();
int lineHeight = 0;
//! [9]
//! [10]
for (QLayoutItem* item : itemList) {
QWidget* wid = item->widget();
int spaceX = horizontalSpacing();
if (spaceX == -1)
spaceX = wid->style()->layoutSpacing(
QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
int spaceY = verticalSpacing();
if (spaceY == -1)
spaceY = wid->style()->layoutSpacing(
QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
//! [10]
//! [11]
int nextX = x + item->sizeHint().width() + spaceX;
if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) {
x = effectiveRect.x();
y = y + lineHeight + spaceY;
nextX = x + item->sizeHint().width() + spaceX;
lineHeight = 0;
}
if (!testOnly) item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
x = nextX;
lineHeight = qMax(lineHeight, item->sizeHint().height());
}
return y + lineHeight - rect.y() + bottom;
}
//! [11]
//! [12]
int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const {
QObject* parent = this->parent();
if (!parent) {
return -1;
} else if (parent->isWidgetType()) {
QWidget* pw = static_cast<QWidget*>(parent);
return pw->style()->pixelMetric(pm, 0, pw);
} else {
return static_cast<QLayout*>(parent)->spacing();
}
}
//! [12]