spacer_widget_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of Qt Designer.  This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
 
 
#ifndef SPACER_WIDGET_H
#define SPACER_WIDGET_H
 
#include "shared_global_p.h"
 
#include <QtWidgets/qwidget.h>
#include <QtWidgets/qsizepolicy.h>
 
QT_BEGIN_NAMESPACE
 
class QDesignerFormWindowInterface;
 
class QDESIGNER_SHARED_EXPORT Spacer: public QWidget
{
    Q_OBJECT
 
    // Special hack: Make name appear as "spacer name"
    Q_PROPERTY(QString spacerName  READ objectName WRITE setObjectName)
    Q_PROPERTY(Qt::Orientation orientation READ orientation WRITE setOrientation)
    Q_PROPERTY(QSizePolicy::Policy sizeType READ sizeType WRITE setSizeType)
    Q_PROPERTY(QSize sizeHint READ sizeHintProperty WRITE setSizeHintProperty DESIGNABLE true STORED true)
 
public:
    Spacer(QWidget *parent = nullptr);
 
    QSize sizeHint() const override;
 
    QSize sizeHintProperty() const;
    void setSizeHintProperty(const QSize &s);
 
    QSizePolicy::Policy sizeType() const;
    void setSizeType(QSizePolicy::Policy t);
 
    Qt::Alignment alignment() const;
    Qt::Orientation orientation() const;
 
    void setOrientation(Qt::Orientation o);
    void setInteractiveMode(bool b) { m_interactive = b; };
 
    bool event(QEvent *e) override;
 
protected:
    void paintEvent(QPaintEvent *e) override;
    void resizeEvent(QResizeEvent* e) override;
    void updateMask();
 
private:
    bool isInLayout() const;
    void updateToolTip();
 
    const QSize m_SizeOffset = QSize(3, 3); // A small offset to ensure the spacer is still visible when reset to size 0,0
    QDesignerFormWindowInterface *m_formWindow;
    Qt::Orientation m_orientation = Qt::Vertical;
    bool m_interactive = true;
    // Cache information about 'being in layout' which is expensive to calculate.
    enum LayoutState { InLayout, OutsideLayout, UnknownLayoutState };
    mutable LayoutState m_layoutState = UnknownLayoutState;
    QSize m_sizeHint = QSize(0, 0);
};
 
QT_END_NAMESPACE
 
#endif // SPACER_WIDGET_H