chartdatetimeaxisy.cpp
143 lines
| 4.9 KiB
| text/x-c
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CppLexer
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r2854 | /**************************************************************************** | ||
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r1717 | ** | ||
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r2854 | ** Copyright (C) 2016 The Qt Company Ltd. | ||
** Contact: https://www.qt.io/licensing/ | ||||
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r1717 | ** | ||
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r2854 | ** This file is part of the Qt Charts module of the Qt Toolkit. | ||
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r1717 | ** | ||
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r2854 | ** $QT_BEGIN_LICENSE:GPL$ | ||
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r2845 | ** 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 | ||||
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r2854 | ** and conditions see https://www.qt.io/terms-conditions. For further | ||
** information use the contact form at https://www.qt.io/contact-us. | ||||
** | ||||
** GNU General Public License Usage | ||||
** Alternatively, this file may be used under the terms of the GNU | ||||
** General Public License version 3 or (at your option) any later version | ||||
** approved by the KDE Free Qt Foundation. The licenses are as published by | ||||
** the Free Software Foundation and appearing in the file LICENSE.GPL3 | ||||
** included in the packaging of this file. Please review the following | ||||
** information to ensure the GNU General Public License requirements will | ||||
** be met: https://www.gnu.org/licenses/gpl-3.0.html. | ||||
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r1717 | ** | ||
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r2845 | ** $QT_END_LICENSE$ | ||
** | ||||
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r2854 | ****************************************************************************/ | ||
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r1717 | |||
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r2714 | #include <private/chartdatetimeaxisy_p.h> | ||
#include <private/chartpresenter_p.h> | ||||
#include <QtCharts/QDateTimeAxis> | ||||
#include <private/abstractchartlayout_p.h> | ||||
#include <QtWidgets/QGraphicsLayout> | ||||
#include <QtCore/QDateTime> | ||||
#include <QtCore/QtMath> | ||||
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r1735 | |||
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r2712 | QT_CHARTS_BEGIN_NAMESPACE | ||
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r1717 | |||
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r2483 | ChartDateTimeAxisY::ChartDateTimeAxisY(QDateTimeAxis *axis, QGraphicsItem *item) | ||
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r2273 | : VerticalAxis(axis, item), | ||
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r2131 | m_axis(axis) | ||
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r1717 | { | ||
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r2483 | QObject::connect(m_axis, SIGNAL(tickCountChanged(int)), this, SLOT(handleTickCountChanged(int))); | ||
QObject::connect(m_axis, SIGNAL(formatChanged(QString)), this, SLOT(handleFormatChanged(QString))); | ||||
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r1717 | } | ||
ChartDateTimeAxisY::~ChartDateTimeAxisY() | ||||
{ | ||||
} | ||||
QVector<qreal> ChartDateTimeAxisY::calculateLayout() const | ||||
{ | ||||
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r2273 | int tickCount = m_axis->tickCount(); | ||
Q_ASSERT(tickCount >= 2); | ||||
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r1717 | |||
QVector<qreal> points; | ||||
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r2273 | points.resize(tickCount); | ||
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r2131 | const QRectF &gridRect = gridGeometry(); | ||
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r2447 | const qreal deltaY = gridRect.height() / (qreal(tickCount) - 1.0); | ||
for (int i = 0; i < tickCount; ++i) | ||||
points[i] = qreal(i) * -deltaY + gridRect.bottom(); | ||||
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r1717 | |||
return points; | ||||
} | ||||
void ChartDateTimeAxisY::updateGeometry() | ||||
{ | ||||
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r2483 | const QVector<qreal> &layout = ChartAxisElement::layout(); | ||
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r2131 | if (layout.isEmpty()) | ||
return; | ||||
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r2483 | setLabels(createDateTimeLabels(min(), max(), layout.size(), m_axis->format())); | ||
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r2111 | VerticalAxis::updateGeometry(); | ||
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r1717 | } | ||
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r2273 | void ChartDateTimeAxisY::handleTickCountChanged(int tick) | ||
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r1717 | { | ||
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r2273 | Q_UNUSED(tick) | ||
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r2334 | QGraphicsLayoutItem::updateGeometry(); | ||
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r2483 | if (presenter()) | ||
presenter()->layout()->invalidate(); | ||||
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r1717 | } | ||
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r2326 | void ChartDateTimeAxisY::handleFormatChanged(const QString &format) | ||
{ | ||||
Q_UNUSED(format); | ||||
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r2334 | QGraphicsLayoutItem::updateGeometry(); | ||
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r2483 | if (presenter()) | ||
presenter()->layout()->invalidate(); | ||||
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r2326 | } | ||
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r2131 | QSizeF ChartDateTimeAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const | ||
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r1965 | { | ||
Q_UNUSED(constraint) | ||||
QSizeF sh; | ||||
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r2137 | QSizeF base = VerticalAxis::sizeHint(which, constraint); | ||
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r2483 | QStringList ticksList = createDateTimeLabels(min(), max(), m_axis->tickCount(), m_axis->format()); | ||
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r2137 | qreal width = 0; | ||
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r2443 | // Height of vertical axis sizeHint indicates the maximum distance labels can extend past | ||
// first and last ticks. Base height is irrelevant. | ||||
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r2137 | qreal height = 0; | ||
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r2105 | |||
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r2443 | if (ticksList.empty()) | ||
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r2273 | return sh; | ||
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r2137 | switch (which) { | ||
case Qt::MinimumSize: { | ||||
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r2712 | QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(), | ||
QStringLiteral("..."), | ||||
axis()->labelsAngle()); | ||||
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r2534 | width = boundingRect.width() + labelPadding() + base.width() + 1.0; | ||
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r2443 | height = boundingRect.height() / 2.0; | ||
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r2412 | sh = QSizeF(width, height); | ||
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r2137 | break; | ||
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r2097 | } | ||
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r2137 | case Qt::PreferredSize: { | ||
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r2534 | qreal labelWidth = 0.0; | ||
qreal firstHeight = -1.0; | ||||
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r2412 | foreach (const QString& s, ticksList) { | ||
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r2539 | QRectF rect = ChartPresenter::textBoundingRect(axis()->labelsFont(), s, axis()->labelsAngle()); | ||
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r2412 | labelWidth = qMax(rect.width(), labelWidth); | ||
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r2443 | height = rect.height(); | ||
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r2534 | if (firstHeight < 0.0) | ||
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r2443 | firstHeight = height; | ||
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r2412 | } | ||
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r2534 | width = labelWidth + labelPadding() + base.width() + 2.0; //two pixels of tolerance | ||
height = qMax(height, firstHeight) / 2.0; | ||||
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r2412 | sh = QSizeF(width, height); | ||
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r2137 | break; | ||
} | ||||
default: | ||||
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r2131 | break; | ||
} | ||||
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r1965 | |||
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r2131 | return sh; | ||
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r1965 | } | ||
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r1717 | |||
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r2273 | #include "moc_chartdatetimeaxisy_p.cpp" | ||
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r2712 | QT_CHARTS_END_NAMESPACE | ||