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 "qgis_gui.h"
#include "qgis_sip.h"
 
#include <QPointer>
#include <QWidget>
 
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:
    QPointer<QWidget> mAnchorWidget;
    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