src_corelib_kernel_qproperty.cpp

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QObject>
#include <QDebug>
 
class MyClass : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int x READ x WRITE setX NOTIFY xChanged BINDABLE bindableX)
public:
    int x() const { return xProp; }
    void setX(int x) { xProp = x; }
    QBindable<int> bindableX() { return QBindable<int>(&xProp); }
 
signals:
    void xChanged();
 
private:
    // Declare the instance of the bindable property data.
    Q_OBJECT_BINDABLE_PROPERTY(MyClass, int, xProp, &MyClass::xChanged)
};
 
class MyClass : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int x READ x WRITE setX NOTIFY xChanged BINDABLE bindableX)
public:
    int x() const { return xProp; }
    void setX(int x) { xProp = x; }
    QBindable<int> bindableX() { return QBindable<int>(&xProp); }
 
signals:
    void xChanged();
 
private:
    // Declare the instance of int bindable property data and
    // initialize it with the value 5.
    // This is similar to declaring
    // int xProp = 5;
    // without using the new QObjectBindableProperty class.
    Q_OBJECT_BINDABLE_PROPERTY_WITH_ARGS(MyClass, int, xProp, 5, &MyClass::xChanged)
};
 
class CustomType
{
public:
    CustomType(int val, int otherVal) : value(val), anotherValue(otherVal) { }
 
private:
    int value = 0;
    int anotherValue = 0;
};
 
// later when using CustomType as a property
Q_OBJECT_BINDABLE_PROPERTY_WITH_ARGS(MyClass, CustomType xProp, CustomType(5, 10),
                                     &MyClass::xChanged)
 
void usage_QBindable() {
    MyClass *myObject;
    QBindable<int> bindableX = myObject->bindableX();
    qDebug() << bindableX.hasBinding(); // prints false
    QProperty<int> y {42};
    bindableX.setBinding([&](){ return 2*y.value(); });
    qDebug() << bindableX.hasBinding() << myObject->x(); // prints true 84
}
 
#include <QObject>
#include <QProperty>
#include <QDebug>
 
class Foo : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int myVal READ myVal WRITE setMyVal BINDABLE bindableMyVal)
public:
    int myVal() { return myValMember.value(); }
    void setMyVal(int newvalue) { myValMember = newvalue; }
    QBindable<int> bindableMyVal() { return &myValMember; }
signals:
    void myValChanged();
 
private:
    Q_OBJECT_BINDABLE_PROPERTY(Foo, int, myValMember, &Foo::myValChanged);
};
 
int main()
{
    bool debugout(true); // enable debug log
    Foo myfoo;
    QProperty<int> prop(42);
    QObject::connect(&myfoo, &Foo::myValChanged, [&]() {
        if (debugout)
            qDebug() << myfoo.myVal();
    });
    myfoo.bindableMyVal().setBinding([&]() { return prop.value(); }); // prints "42"
 
    prop = 5; // prints "5"
    debugout = false;
    prop = 6; // prints nothing
    debugout = true;
    prop = 7; // prints "7"
}
 
#include "main.moc"
 
class Client{};
 
class MyClassPrivate : public QObjectPrivate
{
public:
    QList<Client> clients;
    bool hasClientsActualCalculation() const { return clients.size() > 0; }
    Q_OBJECT_COMPUTED_PROPERTY(MyClassPrivate, bool, hasClientsData,
                               &MyClassPrivate::hasClientsActualCalculation)
};
 
class MyClass : public QObject
{
    Q_OBJECT
    Q_PROPERTY(bool hasClients READ hasClients STORED false BINDABLE bindableHasClients)
public:
    QBindable<bool> bindableHasClients()
    {
        return QBindable<bool>(&d_func()->hasClientsData);
    }
    bool hasClients() const
    {
        return d_func()->hasClientsData.value();
    }
    void addClient(const Client &c)
    {
        Q_D(MyClass);
        d->clients.push_back(c);
        // notify that the value could have changed
        d->hasClientsData.notify();
    }
private:
    Q_DECLARE_PRIVATE(MyClass)
};