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******************************************************************************/

#ifndef QFORMLAYOUT_H
#define QFORMLAYOUT_H

#include <QtWidgets/qtwidgetsglobal.h>
#include <QtWidgets/QLayout>

QT_REQUIRE_CONFIG(formlayout);

QT_BEGIN_NAMESPACE


class QFormLayoutPrivate;

class Q_WIDGETS_EXPORT QFormLayout : public QLayout
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QFormLayout)
    Q_PROPERTY(FieldGrowthPolicy fieldGrowthPolicy READ fieldGrowthPolicy WRITE setFieldGrowthPolicy
               RESET resetFieldGrowthPolicy)
    Q_PROPERTY(RowWrapPolicy rowWrapPolicy READ rowWrapPolicy WRITE setRowWrapPolicy
               RESET resetRowWrapPolicy)
    Q_PROPERTY(Qt::Alignment labelAlignment READ labelAlignment WRITE setLabelAlignment
               RESET resetLabelAlignment)
    Q_PROPERTY(Qt::Alignment formAlignment READ formAlignment WRITE setFormAlignment
               RESET resetFormAlignment)
    Q_PROPERTY(int horizontalSpacing READ horizontalSpacing WRITE setHorizontalSpacing)
    Q_PROPERTY(int verticalSpacing READ verticalSpacing WRITE setVerticalSpacing)

public:
    enum FieldGrowthPolicy {
        FieldsStayAtSizeHint,
        ExpandingFieldsGrow,
        AllNonFixedFieldsGrow
    };
    Q_ENUM(FieldGrowthPolicy)

    enum RowWrapPolicy {
        DontWrapRows,
        WrapLongRows,
        WrapAllRows
    };
    Q_ENUM(RowWrapPolicy)

    enum ItemRole {
        LabelRole = 0,
        FieldRole = 1,
        SpanningRole = 2
    };
    Q_ENUM(ItemRole)

    struct TakeRowResult {
        QLayoutItem *labelItem;
        QLayoutItem *fieldItem;
    };

    explicit QFormLayout(QWidget *parent = nullptr);
    ~QFormLayout();

    void setFieldGrowthPolicy(FieldGrowthPolicy policy);
    FieldGrowthPolicy fieldGrowthPolicy() const;
    void setRowWrapPolicy(RowWrapPolicy policy);
    RowWrapPolicy rowWrapPolicy() const;
    void setLabelAlignment(Qt::Alignment alignment);
    Qt::Alignment labelAlignment() const;
    void setFormAlignment(Qt::Alignment alignment);
    Qt::Alignment formAlignment() const;

    void setHorizontalSpacing(int spacing);
    int horizontalSpacing() const;
    void setVerticalSpacing(int spacing);
    int verticalSpacing() const;

    int spacing() const override;
    void setSpacing(int) override;

    void addRow(QWidget *label, QWidget *field);
    void addRow(QWidget *label, QLayout *field);
    void addRow(const QString &labelText, QWidget *field);
    void addRow(const QString &labelText, QLayout *field);
    void addRow(QWidget *widget);
    void addRow(QLayout *layout);

    void insertRow(int row, QWidget *label, QWidget *field);
    void insertRow(int row, QWidget *label, QLayout *field);
    void insertRow(int row, const QString &labelText, QWidget *field);
    void insertRow(int row, const QString &labelText, QLayout *field);
    void insertRow(int row, QWidget *widget);
    void insertRow(int row, QLayout *layout);

    void removeRow(int row);
    void removeRow(QWidget *widget);
    void removeRow(QLayout *layout);

    TakeRowResult takeRow(int row);
    TakeRowResult takeRow(QWidget *widget);
    TakeRowResult takeRow(QLayout *layout);

    void setItem(int row, ItemRole role, QLayoutItem *item);
    void setWidget(int row, ItemRole role, QWidget *widget);
    void setLayout(int row, ItemRole role, QLayout *layout);

    QLayoutItem *itemAt(int row, ItemRole role) const;
    void getItemPosition(int index, int *rowPtr, ItemRole *rolePtr) const;
    void getWidgetPosition(QWidget *widget, int *rowPtr, ItemRole *rolePtr) const;
    void getLayoutPosition(QLayout *layout, int *rowPtr, ItemRole *rolePtr) const;
    QWidget *labelForField(QWidget *field) const;
    QWidget *labelForField(QLayout *field) const;

    // reimplemented from QLayout
    void addItem(QLayoutItem *item) override;
    QLayoutItem *itemAt(int index) const override;
    QLayoutItem *takeAt(int index) override;

    void setGeometry(const QRect &rect) override;
    QSize minimumSize() const override;
    QSize sizeHint() const override;
    void invalidate() override;

    bool hasHeightForWidth() const override;
    int heightForWidth(int width) const override;
    Qt::Orientations expandingDirections() const override;
    int count() const override;

    int rowCount() const;

#if 0
    void dump() const;
#endif

private:
    void resetFieldGrowthPolicy();
    void resetRowWrapPolicy();
    void resetLabelAlignment();
    void resetFormAlignment();
};

Q_DECLARE_TYPEINFO(QFormLayout::TakeRowResult, Q_PRIMITIVE_TYPE);

QT_END_NAMESPACE

#endif