qgsfloatingwidget.h

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/***************************************************************************
    qgsfloatingwidget.h
    -------------------
    begin                : April 2016
    copyright            : (C) Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSFLOATINGWIDGET_H
#define QGSFLOATINGWIDGET_H

#include <QWidget>
#include "qgis.h"
#include "qgis_gui.h"

class QgsFloatingWidgetEventFilter;

class GUI_EXPORT QgsFloatingWidget: public QWidget
{
    Q_OBJECT
    Q_PROPERTY( QWidget *anchorWidget READ anchorWidget WRITE setAnchorWidget NOTIFY anchorWidgetChanged )
    Q_PROPERTY( AnchorPoint anchorPoint READ anchorPoint WRITE setAnchorPoint NOTIFY anchorPointChanged )
    Q_PROPERTY( AnchorPoint anchorWidgetPoint READ anchorWidgetPoint WRITE setAnchorWidgetPoint NOTIFY anchorWidgetPointChanged )

  public:

    enum AnchorPoint
    {
      TopLeft, 
      TopMiddle, 
      TopRight, 
      MiddleLeft, 
      Middle, 
      MiddleRight, 
      BottomLeft, 
      BottomMiddle, 
      BottomRight, 
    };
    Q_ENUM( AnchorPoint )

    
    QgsFloatingWidget( QWidget *parent SIP_TRANSFERTHIS = nullptr );

    void setAnchorWidget( QWidget *widget );

    QWidget *anchorWidget();

    AnchorPoint anchorPoint() const { return mFloatAnchorPoint; }

    void setAnchorPoint( AnchorPoint point );

    AnchorPoint anchorWidgetPoint() const { return mAnchorWidgetAnchorPoint; }

    void setAnchorWidgetPoint( AnchorPoint point );

  signals:

    void anchorWidgetChanged( QWidget *widget );

    void anchorPointChanged( QgsFloatingWidget::AnchorPoint point );

    void anchorWidgetPointChanged( QgsFloatingWidget::AnchorPoint point );

  protected:
    void showEvent( QShowEvent *e ) override;
    void paintEvent( QPaintEvent *e ) override;
    void resizeEvent( QResizeEvent *e ) override;

  private slots:

    void onAnchorPointChanged();

  private:

    QWidget *mAnchorWidget = nullptr;
    QgsFloatingWidgetEventFilter *mParentEventFilter = nullptr;
    QgsFloatingWidgetEventFilter *mAnchorEventFilter = nullptr;
    AnchorPoint mFloatAnchorPoint = BottomMiddle;
    AnchorPoint mAnchorWidgetAnchorPoint = TopMiddle;

};


#ifndef SIP_RUN


class QgsFloatingWidgetEventFilter: public QObject
{
    Q_OBJECT

  public:

    QgsFloatingWidgetEventFilter( QWidget *parent = nullptr );

    bool eventFilter( QObject *object, QEvent *event ) override;

  signals:

    void anchorPointChanged();

};


#endif

#endif // QGSFLOATINGWIDGET_H