path: root/src/quick/items/qquickpositioners_p.h

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QQUICKPOSITIONERS_P_H
#define QQUICKPOSITIONERS_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtQuick/private/qtquickglobal_p.h>

QT_REQUIRE_CONFIG(quick_positioners);

#include "qquickimplicitsizeitem_p.h"
#if QT_CONFIG(quick_viewtransitions)
#include "qquickitemviewtransition_p.h"
#endif

#include <private/qpodvector_p.h>

#include <QtCore/qobject.h>
#include <QtCore/qstring.h>

QT_BEGIN_NAMESPACE

class QQuickBasePositionerPrivate;

class QQuickPositionerAttached : public QObject
{
    Q_OBJECT

public:
    QQuickPositionerAttached(QObject *parent);

    Q_PROPERTY(int index READ index NOTIFY indexChanged FINAL)
    Q_PROPERTY(bool isFirstItem READ isFirstItem NOTIFY isFirstItemChanged FINAL)
    Q_PROPERTY(bool isLastItem READ isLastItem NOTIFY isLastItemChanged FINAL)

    int index() const { return m_index; }
    void setIndex(int index);

    bool isFirstItem() const { return m_isFirstItem; }
    void setIsFirstItem(bool isFirstItem);

    bool isLastItem() const { return m_isLastItem; }
    void setIsLastItem(bool isLastItem);

Q_SIGNALS:
    void indexChanged();
    void isFirstItemChanged();
    void isLastItemChanged();

private:
    int m_index;
    bool m_isFirstItem;
    bool m_isLastItem;
};

class Q_QUICK_EXPORT QQuickBasePositioner : public QQuickImplicitSizeItem
{
    Q_OBJECT

    Q_PROPERTY(qreal spacing READ spacing WRITE setSpacing NOTIFY spacingChanged)
#if QT_CONFIG(quick_viewtransitions)
    Q_PROPERTY(QQuickTransition *populate READ populate WRITE setPopulate NOTIFY populateChanged)
    Q_PROPERTY(QQuickTransition *move READ move WRITE setMove NOTIFY moveChanged)
    Q_PROPERTY(QQuickTransition *add READ add WRITE setAdd NOTIFY addChanged)
#endif

    Q_PROPERTY(qreal padding READ padding WRITE setPadding RESET resetPadding NOTIFY paddingChanged REVISION(2, 6))
    Q_PROPERTY(qreal topPadding READ topPadding WRITE setTopPadding RESET resetTopPadding NOTIFY topPaddingChanged REVISION(2, 6))
    Q_PROPERTY(qreal leftPadding READ leftPadding WRITE setLeftPadding RESET resetLeftPadding NOTIFY leftPaddingChanged REVISION(2, 6))
    Q_PROPERTY(qreal rightPadding READ rightPadding WRITE setRightPadding RESET resetRightPadding NOTIFY rightPaddingChanged REVISION(2, 6))
    Q_PROPERTY(qreal bottomPadding READ bottomPadding WRITE setBottomPadding RESET resetBottomPadding NOTIFY bottomPaddingChanged REVISION(2, 6))

    QML_NAMED_ELEMENT(Positioner)
    QML_ADDED_IN_VERSION(2, 0)
    QML_UNCREATABLE("Positioner is an abstract type that is only available as an attached property.")
    QML_ATTACHED(QQuickPositionerAttached)

public:
    enum PositionerType { None = 0x0, Horizontal = 0x1, Vertical = 0x2, Both = 0x3 };

    QQuickBasePositioner(PositionerType, QQuickItem *parent);
    ~QQuickBasePositioner();

    qreal spacing() const;
    void setSpacing(qreal);

#if QT_CONFIG(quick_viewtransitions)
    QQuickTransition *populate() const;
    void setPopulate(QQuickTransition *);

    QQuickTransition *move() const;
    void setMove(QQuickTransition *);

    QQuickTransition *add() const;
    void setAdd(QQuickTransition *);
#endif

    static QQuickPositionerAttached *qmlAttachedProperties(QObject *obj);

    void updateAttachedProperties(QQuickPositionerAttached *specificProperty = nullptr, QQuickItem *specificPropertyOwner = nullptr) const;

    qreal padding() const;
    void setPadding(qreal padding);
    void resetPadding();

    qreal topPadding() const;
    void setTopPadding(qreal padding);
    void resetTopPadding();

    qreal leftPadding() const;
    void setLeftPadding(qreal padding);
    void resetLeftPadding();

    qreal rightPadding() const;
    void setRightPadding(qreal padding);
    void resetRightPadding();

    qreal bottomPadding() const;
    void setBottomPadding(qreal padding);
    void resetBottomPadding();

    Q_REVISION(2, 9) Q_INVOKABLE void forceLayout();

protected:
    QQuickBasePositioner(QQuickBasePositionerPrivate &dd, PositionerType at, QQuickItem *parent);
    void componentComplete() override;
    void itemChange(ItemChange, const ItemChangeData &) override;

    void updatePolish() override;

Q_SIGNALS:
    void spacingChanged();
    void populateChanged();
    void moveChanged();
    void addChanged();
    Q_REVISION(2, 6) void paddingChanged();
    Q_REVISION(2, 6) void topPaddingChanged();
    Q_REVISION(2, 6) void leftPaddingChanged();
    Q_REVISION(2, 6) void rightPaddingChanged();
    Q_REVISION(2, 6) void bottomPaddingChanged();
    Q_REVISION(2, 9) void positioningComplete();

protected Q_SLOTS:
    void prePositioning();

protected:
    virtual void doPositioning(QSizeF *contentSize)=0;
    virtual void reportConflictingAnchors()=0;

    class PositionedItem
    {
    public :
        PositionedItem(QQuickItem *i);
        ~PositionedItem();
        bool operator==(const PositionedItem &other) const { return other.item == item; }

        qreal itemX() const;
        qreal itemY() const;

        void moveTo(const QPointF &pos);

#if QT_CONFIG(quick_viewtransitions)
        void transitionNextReposition(QQuickItemViewTransitioner *transitioner, QQuickItemViewTransitioner::TransitionType type, bool asTarget);
        bool prepareTransition(QQuickItemViewTransitioner *transitioner, const QRectF &viewBounds);
        void startTransition(QQuickItemViewTransitioner *transitioner);
#endif

        void updatePadding(qreal lp, qreal tp, qreal rp, qreal bp);

        QQuickItem *item;
#if QT_CONFIG(quick_viewtransitions)
        QQuickItemViewTransitionableItem *transitionableItem;
#endif
        int index;
        bool isNew;
        bool isVisible;

        qreal topPadding;
        qreal leftPadding;
        qreal rightPadding;
        qreal bottomPadding;
    };

    QPODVector<PositionedItem,8> positionedItems;
    QPODVector<PositionedItem,8> unpositionedItems;//Still 'in' the positioner, just not positioned

    void positionItem(qreal x, qreal y, PositionedItem *target);
    void positionItemX(qreal, PositionedItem *target);
    void positionItemY(qreal, PositionedItem *target);

    void removePositionedItem(QPODVector<PositionedItem,8> *items, int index);
    void clearPositionedItems(QPODVector<PositionedItem,8> *items);

private:
    Q_DISABLE_COPY(QQuickBasePositioner)
    Q_DECLARE_PRIVATE(QQuickBasePositioner)
};

class Q_QUICK_EXPORT QQuickColumn : public QQuickBasePositioner
{
    Q_OBJECT
    QML_NAMED_ELEMENT(Column)
    QML_ADDED_IN_VERSION(2, 0)
public:
    QQuickColumn(QQuickItem *parent=nullptr);

protected:
    void doPositioning(QSizeF *contentSize) override;
    void reportConflictingAnchors() override;
};

class QQuickRowPrivate;
class Q_QUICK_EXPORT QQuickRow: public QQuickBasePositioner
{
    Q_OBJECT
    Q_PROPERTY(Qt::LayoutDirection layoutDirection READ layoutDirection WRITE setLayoutDirection NOTIFY layoutDirectionChanged)
    Q_PROPERTY(Qt::LayoutDirection effectiveLayoutDirection READ effectiveLayoutDirection NOTIFY effectiveLayoutDirectionChanged)
    QML_NAMED_ELEMENT(Row)
    QML_ADDED_IN_VERSION(2, 0)

public:
    QQuickRow(QQuickItem *parent=nullptr);

    Qt::LayoutDirection layoutDirection() const;
    void setLayoutDirection (Qt::LayoutDirection);
    Qt::LayoutDirection effectiveLayoutDirection() const;

Q_SIGNALS:
    void layoutDirectionChanged();
    void effectiveLayoutDirectionChanged();

protected:
    void doPositioning(QSizeF *contentSize) override;
    void reportConflictingAnchors() override;
private:
    Q_DECLARE_PRIVATE(QQuickRow)
};

class QQuickGridPrivate;
class Q_QUICK_EXPORT QQuickGrid : public QQuickBasePositioner
{
    Q_OBJECT
    Q_PROPERTY(int rows READ rows WRITE setRows NOTIFY rowsChanged)
    Q_PROPERTY(int columns READ columns WRITE setColumns NOTIFY columnsChanged)
    Q_PROPERTY(qreal rowSpacing READ rowSpacing WRITE setRowSpacing NOTIFY rowSpacingChanged RESET resetRowSpacing)
    Q_PROPERTY(qreal columnSpacing READ columnSpacing WRITE setColumnSpacing NOTIFY columnSpacingChanged RESET resetColumnSpacing)
    Q_PROPERTY(Flow flow READ flow WRITE setFlow NOTIFY flowChanged)
    Q_PROPERTY(Qt::LayoutDirection layoutDirection READ layoutDirection WRITE setLayoutDirection NOTIFY layoutDirectionChanged)
    Q_PROPERTY(Qt::LayoutDirection effectiveLayoutDirection READ effectiveLayoutDirection NOTIFY effectiveLayoutDirectionChanged)
    Q_PROPERTY(HAlignment horizontalItemAlignment READ hItemAlign WRITE setHItemAlign NOTIFY horizontalAlignmentChanged REVISION(2, 1))
    Q_PROPERTY(HAlignment effectiveHorizontalItemAlignment READ effectiveHAlign NOTIFY effectiveHorizontalAlignmentChanged REVISION(2, 1))
    Q_PROPERTY(VAlignment verticalItemAlignment READ vItemAlign WRITE setVItemAlign NOTIFY verticalAlignmentChanged REVISION(2, 1))
    QML_NAMED_ELEMENT(Grid)
    QML_ADDED_IN_VERSION(2, 0)

public:
    QQuickGrid(QQuickItem *parent=nullptr);

    int rows() const { return m_rows; }
    void setRows(const int rows);

    int columns() const { return m_columns; }
    void setColumns(const int columns);

    qreal rowSpacing() const { return m_rowSpacing; }
    void setRowSpacing(qreal);
    void resetRowSpacing() { m_useRowSpacing = false; }

    qreal columnSpacing() const { return m_columnSpacing; }
    void setColumnSpacing(qreal);
    void resetColumnSpacing() { m_useColumnSpacing = false; }

    enum Flow { LeftToRight, TopToBottom };
    Q_ENUM(Flow)
    Flow flow() const;
    void setFlow(Flow);

    Qt::LayoutDirection layoutDirection() const;
    void setLayoutDirection (Qt::LayoutDirection);
    Qt::LayoutDirection effectiveLayoutDirection() const;

    enum HAlignment { AlignLeft = Qt::AlignLeft,
                       AlignRight = Qt::AlignRight,
                       AlignHCenter = Qt::AlignHCenter};
    Q_ENUM(HAlignment)
    enum VAlignment { AlignTop = Qt::AlignTop,
                       AlignBottom = Qt::AlignBottom,
                       AlignVCenter = Qt::AlignVCenter };
    Q_ENUM(VAlignment)

    HAlignment hItemAlign() const;
    void setHItemAlign(HAlignment align);
    HAlignment effectiveHAlign() const;

    VAlignment vItemAlign() const;
    void setVItemAlign(VAlignment align);

Q_SIGNALS:
    void rowsChanged();
    void columnsChanged();
    void flowChanged();
    void layoutDirectionChanged();
    void effectiveLayoutDirectionChanged();
    void rowSpacingChanged();
    void columnSpacingChanged();
    Q_REVISION(2, 1) void horizontalAlignmentChanged(HAlignment alignment);
    Q_REVISION(2, 1) void effectiveHorizontalAlignmentChanged(HAlignment alignment);
    Q_REVISION(2, 1) void verticalAlignmentChanged(VAlignment alignment);

protected:
    void doPositioning(QSizeF *contentSize) override;
    void reportConflictingAnchors() override;

private:
    int m_rows;
    int m_columns;
    qreal m_rowSpacing;
    qreal m_columnSpacing;
    bool m_useRowSpacing;
    bool m_useColumnSpacing;
    Flow m_flow;
    HAlignment m_hItemAlign;
    VAlignment m_vItemAlign;
    Q_DECLARE_PRIVATE(QQuickGrid)
};

class QQuickFlowPrivate;
class Q_QUICK_EXPORT QQuickFlow: public QQuickBasePositioner
{
    Q_OBJECT
    Q_PROPERTY(Flow flow READ flow WRITE setFlow NOTIFY flowChanged)
    Q_PROPERTY(Qt::LayoutDirection layoutDirection READ layoutDirection WRITE setLayoutDirection NOTIFY layoutDirectionChanged)
    Q_PROPERTY(Qt::LayoutDirection effectiveLayoutDirection READ effectiveLayoutDirection NOTIFY effectiveLayoutDirectionChanged)
    QML_NAMED_ELEMENT(Flow)
    QML_ADDED_IN_VERSION(2, 0)
public:
    QQuickFlow(QQuickItem *parent=nullptr);

    enum Flow { LeftToRight, TopToBottom };
    Q_ENUM(Flow)
    Flow flow() const;
    void setFlow(Flow);

    Qt::LayoutDirection layoutDirection() const;
    void setLayoutDirection (Qt::LayoutDirection);
    Qt::LayoutDirection effectiveLayoutDirection() const;

Q_SIGNALS:
    void flowChanged();
    void layoutDirectionChanged();
    void effectiveLayoutDirectionChanged();

protected:
    void doPositioning(QSizeF *contentSize) override;
    void reportConflictingAnchors() override;
protected:
    QQuickFlow(QQuickFlowPrivate &dd, QQuickItem *parent);
private:
    Q_DECLARE_PRIVATE(QQuickFlow)
};

QT_END_NAMESPACE

#endif // QQUICKPOSITIONERS_P_H