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