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// A DelegateChooser like the one, that was added to Qt5.12 (in labs), but compatible with older Qt
// versions see KDE/kquickitemviews see qtdeclarative/qqmldelagatecomponent
#pragma once
#include <QQmlComponent>
#include <QQmlIncubator>
#include <QQmlListProperty>
#include <QQuickItem>
#include <QtCore/QObject>
#include <QtCore/QVariant>
class QQmlAdaptorModel;
class DelegateChoice : public QObject
{
Q_OBJECT
Q_CLASSINFO("DefaultProperty", "delegate")
public:
Q_PROPERTY(QVariant roleValue READ roleValue WRITE setRoleValue NOTIFY roleValueChanged)
Q_PROPERTY(QQmlComponent *delegate READ delegate WRITE setDelegate NOTIFY delegateChanged)
QQmlComponent *delegate() const;
void setDelegate(QQmlComponent *delegate);
QVariant roleValue() const;
void setRoleValue(const QVariant &value);
signals:
void delegateChanged();
void roleValueChanged();
void changed();
private:
QVariant roleValue_;
QQmlComponent *delegate_ = nullptr;
};
class DelegateChooser : public QQuickItem
{
Q_OBJECT
Q_CLASSINFO("DefaultProperty", "choices")
public:
Q_PROPERTY(QQmlListProperty<DelegateChoice> choices READ choices CONSTANT)
Q_PROPERTY(QVariant roleValue READ roleValue WRITE setRoleValue NOTIFY roleValueChanged)
Q_PROPERTY(QQuickItem *child READ child NOTIFY childChanged)
QQmlListProperty<DelegateChoice> choices();
QVariant roleValue() const;
void setRoleValue(const QVariant &value);
QQuickItem *child() const { return child_; }
void recalcChild();
void componentComplete() override;
signals:
void roleChanged();
void roleValueChanged();
void childChanged();
private:
struct DelegateIncubator : public QQmlIncubator
{
DelegateIncubator(DelegateChooser &parent)
: QQmlIncubator(QQmlIncubator::AsynchronousIfNested)
, chooser(parent)
{}
void statusChanged(QQmlIncubator::Status status) override;
DelegateChooser &chooser;
};
QVariant roleValue_;
QList<DelegateChoice *> choices_;
QQuickItem *child_ = nullptr;
DelegateIncubator incubator{*this};
static void appendChoice(QQmlListProperty<DelegateChoice> *, DelegateChoice *);
static int choiceCount(QQmlListProperty<DelegateChoice> *);
static DelegateChoice *choice(QQmlListProperty<DelegateChoice> *, int index);
static void clearChoices(QQmlListProperty<DelegateChoice> *);
};
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