1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
3
4#include <private/chartdatetimeaxisx_p.h>
5#include <private/chartpresenter_p.h>
6#include <QtCharts/QDateTimeAxis>
7#include <private/abstractchartlayout_p.h>
8#include <QtWidgets/QGraphicsLayout>
9#include <QtCore/QDateTime>
10#include <QtCore/QtMath>
11
12QT_BEGIN_NAMESPACE
13
14ChartDateTimeAxisX::ChartDateTimeAxisX(QDateTimeAxis *axis, QGraphicsItem *item)
15 : HorizontalAxis(axis, item),
16 m_axis(axis)
17{
18 QObject::connect(sender: m_axis, SIGNAL(tickCountChanged(int)), receiver: this, SLOT(handleTickCountChanged(int)));
19 QObject::connect(sender: m_axis, SIGNAL(formatChanged(QString)), receiver: this, SLOT(handleFormatChanged(QString)));
20}
21
22ChartDateTimeAxisX::~ChartDateTimeAxisX()
23{
24}
25
26QList<qreal> ChartDateTimeAxisX::calculateLayout() const
27{
28 int tickCount = m_axis->tickCount();
29
30 Q_ASSERT(tickCount >= 2);
31
32 QList<qreal> points;
33 points.resize(size: tickCount);
34 const QRectF &gridRect = gridGeometry();
35 const qreal deltaX = gridRect.width() / (qreal(tickCount) - 1.0);
36 for (int i = 0; i < tickCount; ++i)
37 points[i] = qreal(i) * deltaX + gridRect.left();
38 return points;
39}
40
41void ChartDateTimeAxisX::updateGeometry()
42{
43 const QList<qreal> &layout = ChartAxisElement::layout();
44 if (layout.isEmpty())
45 return;
46 setLabels(createDateTimeLabels(max: min(), min: max(), ticks: layout.size(), format: m_axis->format()));
47 HorizontalAxis::updateGeometry();
48 updateLabelsDateTimes();
49}
50
51void ChartDateTimeAxisX::handleTickCountChanged(int tick)
52{
53 Q_UNUSED(tick);
54 QGraphicsLayoutItem::updateGeometry();
55 if (presenter())
56 presenter()->layout()->invalidate();
57}
58
59void ChartDateTimeAxisX::handleFormatChanged(const QString &format)
60{
61 Q_UNUSED(format);
62 QGraphicsLayoutItem::updateGeometry();
63 if (presenter())
64 presenter()->layout()->invalidate();
65}
66
67QSizeF ChartDateTimeAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
68{
69 Q_UNUSED(constraint);
70
71 QSizeF sh;
72
73 QSizeF base = HorizontalAxis::sizeHint(which, constraint);
74 const QStringList ticksList =
75 createDateTimeLabels(max: min(), min: max(), ticks: m_axis->tickCount(), format: m_axis->format());
76 // Width of horizontal axis sizeHint indicates the maximum distance labels can extend past
77 // first and last ticks. Base width is irrelevant.
78 qreal width = 0;
79 qreal height = 0;
80
81 if (ticksList.empty())
82 return sh;
83
84 switch (which) {
85 case Qt::MinimumSize: {
86 if (labelsVisible()) {
87 QRectF boundingRect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(),
88 QStringLiteral("..."),
89 angle: axis()->labelsAngle());
90 width = boundingRect.width() / 2.0;
91 height = boundingRect.height() + labelPadding() + base.height() + 1.0;
92 } else {
93 width = 0;
94 height = base.height() + 1.0;
95 }
96 sh = QSizeF(width, height);
97 break;
98 }
99 case Qt::PreferredSize: {
100 if (labelsVisible()) {
101 qreal labelHeight = 0.0;
102 qreal firstWidth = -1.0;
103 for (const QString &s : ticksList) {
104 QRectF rect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), text: s, angle: axis()->labelsAngle());
105 labelHeight = qMax(a: rect.height(), b: labelHeight);
106 width = rect.width();
107 if (firstWidth < 0.0)
108 firstWidth = width;
109 }
110 height = labelHeight + labelPadding() + base.height() + 1.0;
111 width = qMax(a: width, b: firstWidth) / 2.0;
112 } else {
113 height = base.height() + 1.0;
114 width = 0;
115 }
116 sh = QSizeF(width, height);
117 break;
118 }
119 default:
120 break;
121 }
122
123 return sh;
124}
125
126QT_END_NAMESPACE
127
128#include "moc_chartdatetimeaxisx_p.cpp"
129

source code of qtcharts/src/charts/axis/datetimeaxis/chartdatetimeaxisx.cpp