1/*
2 * SPDX-FileCopyrightText: 2020 Arjen Hiemstra <ahiemstra@heimr.nl>
3 *
4 * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
5 */
6
7#ifndef LEGENDLAYOUT_H
8#define LEGENDLAYOUT_H
9
10#include <QQuickItem>
11#include <qqmlregistration.h>
12
13class LegendLayoutAttached : public QObject
14{
15 Q_OBJECT
16 QML_ANONYMOUS
17
18public:
19 explicit LegendLayoutAttached(QObject *parent = nullptr);
20
21 Q_PROPERTY(qreal minimumWidth READ minimumWidth WRITE setMinimumWidth NOTIFY minimumWidthChanged)
22 qreal minimumWidth() const;
23 void setMinimumWidth(qreal newMinimumWidth);
24 Q_SIGNAL void minimumWidthChanged();
25 bool isMinimumWidthValid() const;
26
27 Q_PROPERTY(qreal preferredWidth READ preferredWidth WRITE setPreferredWidth NOTIFY preferredWidthChanged)
28 qreal preferredWidth() const;
29 void setPreferredWidth(qreal newPreferredWidth);
30 Q_SIGNAL void preferredWidthChanged();
31 bool isPreferredWidthValid() const;
32
33 Q_PROPERTY(qreal maximumWidth READ maximumWidth WRITE setMaximumWidth NOTIFY maximumWidthChanged)
34 qreal maximumWidth() const;
35 void setMaximumWidth(qreal newMaximumWidth);
36 Q_SIGNAL void maximumWidthChanged();
37 bool isMaximumWidthValid() const;
38
39private:
40 std::optional<qreal> m_minimumWidth;
41 std::optional<qreal> m_preferredWidth;
42 std::optional<qreal> m_maximumWidth;
43};
44
45class LegendLayout : public QQuickItem
46{
47 Q_OBJECT
48 QML_ELEMENT
49 QML_ATTACHED(LegendLayoutAttached)
50
51public:
52 explicit LegendLayout(QQuickItem *parent = nullptr);
53
54 Q_PROPERTY(qreal horizontalSpacing READ horizontalSpacing WRITE setHorizontalSpacing NOTIFY horizontalSpacingChanged)
55 qreal horizontalSpacing() const;
56 void setHorizontalSpacing(qreal newHorizontalSpacing);
57 Q_SIGNAL void horizontalSpacingChanged();
58
59 Q_PROPERTY(qreal verticalSpacing READ verticalSpacing WRITE setVerticalSpacing NOTIFY verticalSpacingChanged)
60 qreal verticalSpacing() const;
61 void setVerticalSpacing(qreal newVerticalSpacing);
62 Q_SIGNAL void verticalSpacingChanged();
63
64 Q_PROPERTY(qreal preferredWidth READ preferredWidth NOTIFY preferredWidthChanged)
65 qreal preferredWidth() const;
66 Q_SIGNAL void preferredWidthChanged();
67
68 static LegendLayoutAttached *qmlAttachedProperties(QObject *object)
69 {
70 return new LegendLayoutAttached(object);
71 }
72
73protected:
74 void componentComplete() override;
75 void updatePolish() override;
76 void geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry) override;
77 void itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &data) override;
78
79private:
80 std::tuple<int, int, qreal, qreal> determineColumns();
81
82 qreal m_horizontalSpacing = 0.0;
83 qreal m_verticalSpacing = 0.0;
84 qreal m_preferredWidth = 0.0;
85
86 bool m_completed = false;
87};
88
89#endif // LEGENDLAYOUT_H
90

source code of kquickcharts/controls/LegendLayout.h