inputregion.h

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// SPDX-FileCopyrightText: 2022 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
//
// SPDX-License-Identifier: MPL-2.0
 
#pragma once
 
#include <QQmlEngine>
#include <QQmlListProperty>
#include <QQmlParserStatus>
#include <QWindow>
 
class InputRegion;
 
class InputArea : public QObject, public QQmlParserStatus
{
    Q_OBJECT
    Q_PROPERTY(InputRegion *region READ region WRITE setRegion NOTIFY regionChanged)
    Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled NOTIFY enabledChanged)
    Q_PROPERTY(qreal x READ x WRITE setX NOTIFY xChanged)
    Q_PROPERTY(qreal y READ y WRITE setY NOTIFY yChanged)
    Q_PROPERTY(qreal width READ width WRITE setWidth NOTIFY widthChanged)
    Q_PROPERTY(qreal height READ height WRITE setHeight NOTIFY heightChanged)
    Q_INTERFACES(QQmlParserStatus)
    QML_ELEMENT
    QML_LIST_PROPERTY_ASSIGN_BEHAVIOR_APPEND
public:
    InputArea(QObject *parent = nullptr);
    ~InputArea();
 
    InputRegion *region() const;
    void setRegion(InputRegion *region);
 
    bool isEnabled() const;
    void setEnabled(bool enabled);
 
    qreal x() const;
    void setX(qreal x);
 
    qreal y() const;
    void setY(qreal y);
 
    qreal width() const;
    void setWidth(qreal width);
 
    qreal height() const;
    void setHeight(qreal height);
 
    QRectF rect() const;
 
Q_SIGNALS:
    void regionChanged(InputRegion *region);
    void enabledChanged(bool enabled);
    void xChanged(qreal x);
    void yChanged(qreal y);
    void widthChanged(qreal width);
    void heightChanged(qreal height);
 
protected:
    void classBegin() override {}
    void componentComplete() override;
 
private:
    bool m_initialized = false;
    InputRegion *m_region = nullptr;
    bool m_enabled = true;
    qreal m_x = 0, m_y = 0, m_width = 0, m_height = 0;
};
 
class InputRegion : public QObject, public QQmlParserStatus
{
    Q_OBJECT
    Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled NOTIFY enabledChanged)
    Q_PROPERTY(QWindow *window READ window WRITE setWindow NOTIFY windowChanged)
    Q_PROPERTY(QQmlListProperty<InputArea> areas READ areas CONSTANT)
    Q_INTERFACES(QQmlParserStatus)
    QML_ELEMENT
public:
    explicit InputRegion(QObject *parent = nullptr);
 
    bool isEnabled() const;
    void setEnabled(bool enabled);
 
    QWindow *window() const;
    void setWindow(QWindow *window);
 
    QQmlListProperty<InputArea> areas();
 
    void registerArea(InputArea *area);
    void unregisterArea(InputArea *area);
 
Q_SIGNALS:
    void enabledChanged(bool enabled);
    void windowChanged(QWindow *window);
 
protected:
    void classBegin() override {}
    void componentComplete() override;
 
private:
    bool m_initialized = false;
    bool m_enabled = true;
    QWindow *m_window = nullptr;
    QList<InputArea *> m_areas;
 
    static qsizetype areasCount(QQmlListProperty<InputArea> *list);
    static InputArea *areaAt(QQmlListProperty<InputArea> *list, qsizetype index);
 
private Q_SLOTS:
    void setInputRegion();
};