qlayout.h

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// 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 QLAYOUT_H
#define QLAYOUT_H
 
#include <QtWidgets/qtwidgetsglobal.h>
#include <QtCore/qobject.h>
#include <QtWidgets/qlayoutitem.h>
#include <QtWidgets/qsizepolicy.h>
#include <QtCore/qrect.h>
#include <QtCore/qmargins.h>
 
#include <limits.h>
 
QT_BEGIN_NAMESPACE
 
 
class QLayout;
class QSize;
 
 
class QLayoutPrivate;
 
class Q_WIDGETS_EXPORT QLayout : public QObject, public QLayoutItem
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QLayout)
 
    Q_PROPERTY(int spacing READ spacing WRITE setSpacing)
    Q_PROPERTY(QMargins contentsMargins READ contentsMargins WRITE setContentsMargins
               RESET unsetContentsMargins)
    Q_PROPERTY(SizeConstraint sizeConstraint READ sizeConstraint WRITE setSizeConstraint)
public:
    enum SizeConstraint {
        SetDefaultConstraint,
        SetNoConstraint,
        SetMinimumSize,
        SetFixedSize,
        SetMaximumSize,
        SetMinAndMaxSize
    };
    Q_ENUM(SizeConstraint)
 
    explicit QLayout(QWidget *parent = nullptr);
    ~QLayout();
 
    virtual int spacing() const;
    virtual void setSpacing(int);
 
    void setContentsMargins(int left, int top, int right, int bottom);
    void setContentsMargins(const QMargins &margins);
    void unsetContentsMargins();
    void getContentsMargins(int *left, int *top, int *right, int *bottom) const;
    QMargins contentsMargins() const;
    QRect contentsRect() const;
 
    bool setAlignment(QWidget *w, Qt::Alignment alignment);
    bool setAlignment(QLayout *l, Qt::Alignment alignment);
    using QLayoutItem::setAlignment;
 
    void setSizeConstraint(SizeConstraint);
    SizeConstraint sizeConstraint() const;
    void setMenuBar(QWidget *w);
    QWidget *menuBar() const;
 
    QWidget *parentWidget() const;
 
    void invalidate() override;
    QRect geometry() const override;
    bool activate();
    void update();
 
    void addWidget(QWidget *w);
    virtual void addItem(QLayoutItem *) = 0;
 
    void removeWidget(QWidget *w);
    void removeItem(QLayoutItem *);
 
    Qt::Orientations expandingDirections() const override;
    QSize minimumSize() const override;
    QSize maximumSize() const override;
    virtual void setGeometry(const QRect&) override;
    virtual QLayoutItem *itemAt(int index) const = 0;
    virtual QLayoutItem *takeAt(int index) = 0;
    virtual int indexOf(const QWidget *) const;
    virtual int indexOf(const QLayoutItem *) const;
    virtual int count() const = 0;
    bool isEmpty() const override;
    QSizePolicy::ControlTypes controlTypes() const override;
 
    virtual QLayoutItem *replaceWidget(QWidget *from, QWidget *to,
                                       Qt::FindChildOptions options = Qt::FindChildrenRecursively);
 
    int totalMinimumHeightForWidth(int w) const;
    int totalHeightForWidth(int w) const;
    QSize totalMinimumSize() const;
    QSize totalMaximumSize() const;
    QSize totalSizeHint() const;
    QLayout *layout() override;
 
    void setEnabled(bool);
    bool isEnabled() const;
 
 
    static QSize closestAcceptableSize(const QWidget *w, const QSize &s);
 
protected:
    void widgetEvent(QEvent *);
    void childEvent(QChildEvent *e) override;
    void addChildLayout(QLayout *l);
    void addChildWidget(QWidget *w);
    bool adoptLayout(QLayout *layout);
 
    QRect alignmentRect(const QRect&) const;
protected:
    QLayout(QLayoutPrivate &d, QLayout*, QWidget*);
 
private:
    Q_DISABLE_COPY(QLayout)
 
    static void activateRecursiveHelper(QLayoutItem *item);
 
    friend class QApplicationPrivate;
    friend class QWidget;
 
};
 
QT_END_NAMESPACE
 
//### support old includes
#include <QtWidgets/qboxlayout.h>
#include <QtWidgets/qgridlayout.h>
 
#endif // QLAYOUT_H