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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 Qt Charts module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL$
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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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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 or (at your option) any later version
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** approved by the KDE Free Qt Foundation. The licenses are as published by
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** the Free Software Foundation and appearing in the file LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <private/abstractchartlayout_p.h>
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#include <private/chartpresenter_p.h>
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#include <private/qlegend_p.h>
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#include <private/chartaxiselement_p.h>
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#include <private/charttitle_p.h>
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#include <private/chartbackground_p.h>
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#include <QtCore/QDebug>
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QT_CHARTS_BEGIN_NAMESPACE
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static const qreal golden_ratio = 0.4;
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AbstractChartLayout::AbstractChartLayout(ChartPresenter *presenter)
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: m_presenter(presenter),
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m_margins(20, 20, 20, 20),
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m_minChartRect(0, 0, 200, 200)
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{
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}
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AbstractChartLayout::~AbstractChartLayout()
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{
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}
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void AbstractChartLayout::setGeometry(const QRectF &rect)
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{
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if (!rect.isValid())
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return;
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if (m_presenter->chart()->isVisible()) {
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QList<ChartAxisElement *> axes = m_presenter->axisItems();
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ChartTitle *title = m_presenter->titleElement();
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QLegend *legend = m_presenter->legend();
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ChartBackground *background = m_presenter->backgroundElement();
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QRectF contentGeometry = calculateBackgroundGeometry(rect, background);
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contentGeometry = calculateContentGeometry(contentGeometry);
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if (title && title->isVisible())
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contentGeometry = calculateTitleGeometry(contentGeometry, title);
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if (legend->isAttachedToChart() && legend->isVisible())
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contentGeometry = calculateLegendGeometry(contentGeometry, legend);
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contentGeometry = calculateAxisGeometry(contentGeometry, axes);
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m_presenter->setGeometry(contentGeometry);
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if (m_presenter->chart()->chartType() == QChart::ChartTypeCartesian)
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static_cast<QGraphicsRectItem *>(m_presenter->plotAreaElement())->setRect(contentGeometry);
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else
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static_cast<QGraphicsEllipseItem *>(m_presenter->plotAreaElement())->setRect(contentGeometry);
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}
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QGraphicsLayout::setGeometry(rect);
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}
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QRectF AbstractChartLayout::calculateContentGeometry(const QRectF &geometry) const
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{
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return geometry.adjusted(m_margins.left(), m_margins.top(), -m_margins.right(), -m_margins.bottom());
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}
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QRectF AbstractChartLayout::calculateContentMinimum(const QRectF &minimum) const
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{
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return minimum.adjusted(0, 0, m_margins.left() + m_margins.right(), m_margins.top() + m_margins.bottom());
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}
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QRectF AbstractChartLayout::calculateBackgroundGeometry(const QRectF &geometry, ChartBackground *background) const
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{
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qreal left;
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qreal top;
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qreal right;
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qreal bottom;
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getContentsMargins(&left, &top, &right, &bottom);
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QRectF backgroundGeometry = geometry.adjusted(left, top, -right, -bottom);
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if (background)
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background->setRect(backgroundGeometry);
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return backgroundGeometry;
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}
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QRectF AbstractChartLayout::calculateBackgroundMinimum(const QRectF &minimum) const
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{
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qreal left;
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qreal top;
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qreal right;
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qreal bottom;
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getContentsMargins(&left, &top, &right, &bottom);
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return minimum.adjusted(0, 0, left + right, top + bottom);
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}
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QRectF AbstractChartLayout::calculateLegendGeometry(const QRectF &geometry, QLegend *legend) const
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{
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QSizeF size = legend->effectiveSizeHint(Qt::PreferredSize, QSizeF(-1, -1));
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QRectF legendRect;
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QRectF result;
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switch (legend->alignment()) {
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case Qt::AlignTop: {
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legendRect = QRectF(geometry.topLeft(), QSizeF(geometry.width(), size.height()));
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result = geometry.adjusted(0, legendRect.height(), 0, 0);
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break;
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}
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case Qt::AlignBottom: {
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legendRect = QRectF(QPointF(geometry.left(), geometry.bottom() - size.height()), QSizeF(geometry.width(), size.height()));
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result = geometry.adjusted(0, 0, 0, -legendRect.height());
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break;
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}
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case Qt::AlignLeft: {
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qreal width = qMin(size.width(), geometry.width() * golden_ratio);
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legendRect = QRectF(geometry.topLeft(), QSizeF(width, geometry.height()));
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result = geometry.adjusted(width, 0, 0, 0);
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break;
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}
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case Qt::AlignRight: {
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qreal width = qMin(size.width(), geometry.width() * golden_ratio);
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legendRect = QRectF(QPointF(geometry.right() - width, geometry.top()), QSizeF(width, geometry.height()));
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result = geometry.adjusted(0, 0, -width, 0);
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break;
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}
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default: {
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legendRect = QRectF(0, 0, 0, 0);
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result = geometry;
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break;
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}
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}
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legend->setGeometry(legendRect);
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return result;
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}
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QRectF AbstractChartLayout::calculateLegendMinimum(const QRectF &geometry, QLegend *legend) const
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{
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QSizeF minSize = legend->effectiveSizeHint(Qt::MinimumSize, QSizeF(-1, -1));
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return geometry.adjusted(0, 0, minSize.width(), minSize.height());
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}
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QRectF AbstractChartLayout::calculateTitleGeometry(const QRectF &geometry, ChartTitle *title) const
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{
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title->setGeometry(geometry);
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if (title->text().isEmpty()) {
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return geometry;
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} else {
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// Round to full pixel via QPoint to avoid one pixel clipping on the edge in some cases
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QPointF center((geometry.center() - title->boundingRect().center()).toPoint());
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title->setPos(center.x(), title->pos().y());
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return geometry.adjusted(0, title->boundingRect().height() + 1, 0, 0);
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}
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}
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QRectF AbstractChartLayout::calculateTitleMinimum(const QRectF &minimum, ChartTitle *title) const
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{
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QSizeF min = title->sizeHint(Qt::MinimumSize);
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return minimum.adjusted(0, 0, min.width(), min.height());
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}
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QSizeF AbstractChartLayout::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
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{
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Q_UNUSED(constraint);
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if (which == Qt::MinimumSize) {
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QList<ChartAxisElement *> axes = m_presenter->axisItems();
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ChartTitle *title = m_presenter->titleElement();
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QLegend *legend = m_presenter->legend();
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QRectF minimumRect(0, 0, 0, 0);
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minimumRect = calculateBackgroundMinimum(minimumRect);
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minimumRect = calculateContentMinimum(minimumRect);
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minimumRect = calculateTitleMinimum(minimumRect, title);
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minimumRect = calculateLegendMinimum(minimumRect, legend);
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minimumRect = calculateAxisMinimum(minimumRect, axes);
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return minimumRect.united(m_minChartRect).size().toSize();
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}
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return QSize(-1, -1);
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}
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void AbstractChartLayout::setMargins(const QMargins &margins)
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{
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if (m_margins != margins) {
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m_margins = margins;
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updateGeometry();
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}
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}
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QMargins AbstractChartLayout::margins() const
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{
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return m_margins;
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}
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QT_CHARTS_END_NAMESPACE
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