qgscheckablecombobox.h

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/***************************************************************************
                              qgscheckablecombobox.h
                              ------------------------
  begin                : March 21, 2017
  copyright            : (C) 2017 by Alexander Bruy
  email                : alexander dot bruy 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 QGSCHECKABLECOMBOBOX_H
#define QGSCHECKABLECOMBOBOX_H
 
#include <QComboBox>
#include <QMenu>
#include <QStandardItemModel>
#include <QStyledItemDelegate>
 
#include "qgis_sip.h"
#include "qgis_gui.h"
#include "qgis.h"
 
class QEvent;
 
#ifndef SIP_RUN
class QgsCheckableItemModel : public QStandardItemModel
{
    Q_OBJECT
 
  public:
 
    QgsCheckableItemModel( QObject *parent = nullptr );
 
    Qt::ItemFlags flags( const QModelIndex &index ) const override;
 
    QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const override;
 
    bool setData( const QModelIndex &index, const QVariant &value, int role = Qt::EditRole ) override;
 
  signals:
 
    void itemCheckStateChanged( const QModelIndex &index );
};
 
 
class QgsCheckBoxDelegate : public QStyledItemDelegate
{
    Q_OBJECT
 
  public:
 
    QgsCheckBoxDelegate( QObject *parent = nullptr );
 
    void paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const override;
};
#endif
 
class GUI_EXPORT QgsCheckableComboBox : public QComboBox
{
    Q_OBJECT
 
    Q_PROPERTY( QString separator READ separator WRITE setSeparator )
    Q_PROPERTY( QString defaultText READ defaultText WRITE setDefaultText )
    Q_PROPERTY( QStringList checkedItems READ checkedItems WRITE setCheckedItems )
 
  public:
 
    QgsCheckableComboBox( QWidget *parent SIP_TRANSFERTHIS = nullptr );
 
    QString separator() const;
 
    void setSeparator( const QString &separator );
 
    QString defaultText() const;
 
    void setDefaultText( const QString &text );
 
    void addItemWithCheckState( const QString &text, Qt::CheckState state, const QVariant &userData = QVariant() );
 
    QStringList checkedItems() const;
 
    QVariantList checkedItemsData() const;
 
    Qt::CheckState itemCheckState( int index ) const;
 
    void setItemCheckState( int index, Qt::CheckState state );
 
    void toggleItemCheckState( int index );
 
    QgsCheckableItemModel *model() const SIP_SKIP {return mModel;}
 
    void hidePopup() override;
 
    bool eventFilter( QObject *object, QEvent *event ) override;
 
  signals:
 
    void checkedItemsChanged( const QStringList &items );
 
  public slots:
 
    void setCheckedItems( const QStringList &items );
 
  protected:
 
    void resizeEvent( QResizeEvent *event ) override;
 
  protected slots:
 
    void showContextMenu( QPoint pos );
 
    void selectAllOptions();
 
    void deselectAllOptions();
 
  protected:
    QgsCheckableItemModel *mModel = nullptr;
 
  private:
    void updateCheckedItems();
    void updateDisplayText();
 
    QString mSeparator;
    QString mDefaultText;
 
    bool mSkipHide = false;
 
    QMenu *mContextMenu = nullptr;
    QAction *mSelectAllAction = nullptr;
    QAction *mDeselectAllAction = nullptr;
};
 
#endif // QGSCHECKABLECOMBOBOX_H