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/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt 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 Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "chartdatetimeaxisx_p.h"
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#include "chartpresenter_p.h"
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#include "qdatetimeaxis.h"
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#include "abstractchartlayout_p.h"
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#include <QGraphicsLayout>
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#include <QDateTime>
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#include <QFontMetrics>
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#include <qmath.h>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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ChartDateTimeAxisX::ChartDateTimeAxisX(QDateTimeAxis *axis, QGraphicsItem *item)
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: HorizontalAxis(axis, item),
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m_axis(axis)
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{
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QObject::connect(m_axis, SIGNAL(tickCountChanged(int)), this, SLOT(handleTickCountChanged(int)));
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QObject::connect(m_axis, SIGNAL(formatChanged(QString)), this, SLOT(handleFormatChanged(QString)));
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}
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ChartDateTimeAxisX::~ChartDateTimeAxisX()
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{
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}
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QVector<qreal> ChartDateTimeAxisX::calculateLayout() const
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{
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int tickCount = m_axis->tickCount();
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Q_ASSERT(tickCount >= 2);
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QVector<qreal> points;
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points.resize(tickCount);
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const QRectF &gridRect = gridGeometry();
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const qreal deltaX = gridRect.width() / (qreal(tickCount) - 1.0);
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for (int i = 0; i < tickCount; ++i)
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points[i] = qreal(i) * deltaX + gridRect.left();
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return points;
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}
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void ChartDateTimeAxisX::updateGeometry()
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{
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const QVector<qreal>& layout = ChartAxisElement::layout();
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if (layout.isEmpty())
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return;
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setLabels(createDateTimeLabels(min(), max(), layout.size(), m_axis->format()));
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HorizontalAxis::updateGeometry();
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}
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void ChartDateTimeAxisX::handleTickCountChanged(int tick)
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{
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Q_UNUSED(tick)
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QGraphicsLayoutItem::updateGeometry();
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if (presenter())
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presenter()->layout()->invalidate();
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}
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void ChartDateTimeAxisX::handleFormatChanged(const QString &format)
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{
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Q_UNUSED(format);
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QGraphicsLayoutItem::updateGeometry();
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if (presenter())
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presenter()->layout()->invalidate();
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}
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QSizeF ChartDateTimeAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
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{
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Q_UNUSED(constraint)
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QFontMetrics fn(axis()->labelsFont());
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QSizeF sh;
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QSizeF base = HorizontalAxis::sizeHint(which, constraint);
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QStringList ticksList = createDateTimeLabels(min(), max(), m_axis->tickCount(), m_axis->format());
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// Width of horizontal axis sizeHint indicates the maximum distance labels can extend past
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// first and last ticks. Base width is irrelevant.
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qreal width = 0;
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qreal height = 0;
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if (ticksList.empty())
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return sh;
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switch (which) {
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case Qt::MinimumSize: {
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QRectF boundingRect = labelBoundingRect(fn, "...");
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width = boundingRect.width() / 2.0;
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height = boundingRect.height() + labelPadding();
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height += base.height();
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sh = QSizeF(width, height);
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break;
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}
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case Qt::PreferredSize: {
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int labelHeight = 0;
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int firstWidth = -1;
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foreach (const QString& s, ticksList) {
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QRect rect = labelBoundingRect(fn, s);
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labelHeight = qMax(rect.height(), labelHeight);
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width = rect.width();
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if (firstWidth < 0)
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firstWidth = width;
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}
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height = labelHeight + labelPadding();
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height += base.height();
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width = qMax(width, qreal(firstWidth)) / 2.0;
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sh = QSizeF(width, height);
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break;
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}
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default:
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break;
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}
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return sh;
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}
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#include "moc_chartdatetimeaxisx_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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