qwidgetresizehandler_p.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 QWIDGETRESIZEHANDLER_P_H
#define QWIDGETRESIZEHANDLER_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  This header file may
// change from version to version without notice, or even be
// removed.
//
// We mean it.
//
 
#include <QtWidgets/private/qtwidgetsglobal_p.h>
#include "QtCore/qobject.h"
#include "QtCore/qpoint.h"
 
QT_REQUIRE_CONFIG(resizehandler);
 
QT_BEGIN_NAMESPACE
 
class QMouseEvent;
class QKeyEvent;
 
class QWidgetResizeHandler : public QObject
{
    Q_OBJECT
 
public:
    explicit QWidgetResizeHandler(QWidget *parent, QWidget *cw = nullptr);
    void setEnabled(bool b);
    bool isEnabled() const;
 
    bool isButtonDown() const { return buttonDown; }
 
    void setExtraHeight(int h) { extrahei = h; }
 
    void setFrameWidth(int w) { fw = w; }
 
    void doResize();
 
Q_SIGNALS:
    void activate();
 
protected:
    bool eventFilter(QObject *o, QEvent *e) override;
    void mouseMoveEvent(QMouseEvent *e);
    void keyPressEvent(QKeyEvent *e);
 
private:
    Q_DISABLE_COPY_MOVE(QWidgetResizeHandler)
 
    enum MousePosition {
        Nowhere,
        TopLeft, BottomRight, BottomLeft, TopRight,
        Top, Bottom, Left, Right,
        Center
    };
 
    QWidget *widget;
    QWidget *childWidget;
    QPoint moveOffset;
    QPoint invertedMoveOffset;
    MousePosition mode;
    int fw;
    int extrahei;
    int range;
    uint buttonDown     :1;
    uint active         :1;
    uint enabled        :1;
 
    void setMouseCursor(MousePosition m);
    bool isResizing() const {
        return active && mode != Center;
    }
};
 
QT_END_NAMESPACE
 
#endif // QWIDGETRESIZEHANDLER_P_H