1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef CUSTOMITEM_H
#define CUSTOMITEM_H
//! [1]
#include <QQuickItem>
class CustomItem : public QQuickItem
{
Q_OBJECT
//! [2]
Q_PROPERTY(qreal zoom READ zoom WRITE setZoom NOTIFY zoomChanged)
Q_PROPERTY(int iterationLimit READ iterationLimit WRITE setIterationLimit NOTIFY iterationLimitChanged)
Q_PROPERTY(QPointF center READ center WRITE setCenter NOTIFY centerChanged)
//! [2]
QML_ELEMENT
public:
explicit CustomItem(QQuickItem *parent = nullptr);
qreal zoom() const
{
return m_zoom;
}
int iterationLimit() const
{
return m_limit;
}
QPointF center() const
{
return m_center;
}
public slots:
void setZoom(qreal zoom);
void setIterationLimit(int iterationLimit);
void setCenter(QPointF center);
signals:
void zoomChanged(qreal zoom);
void iterationLimitChanged(int iterationLimit);
void centerChanged(QPointF center);
protected:
QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *) override;
void geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry) override;
private:
bool m_geometryChanged = true;
qreal m_zoom;
bool m_zoomChanged = true;
int m_limit;
bool m_limitChanged = true;
QPointF m_center;
bool m_centerChanged = true;
};
//! [1]
#endif // CUSTOMITEM_H
|
