qgsfieldvalueslineedit.h

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/***************************************************************************
    qgsfieldvalueslineedit.h
     -----------------------
    Date                 : 20-08-2016
    Copyright            : (C) 2016 by 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 QGSFIELDVALUESLINEEDIT_H
#define QGSFIELDVALUESLINEEDIT_H
 
#include "qgis_gui.h"
#include "qgis_sip.h"
#include "qgsfeedback.h"
#include "qgsfilterlineedit.h"
 
#include <QFocusEvent>
#include <QHeaderView>
#include <QMutex>
#include <QStringListModel>
#include <QThread>
#include <QTimer>
#include <QTreeView>
 
class QgsFloatingWidget;
class QgsVectorLayer;
 
 
#ifndef SIP_RUN
 
// just internal guff - definitely not for exposing to public API!

class QgsFieldValuesLineEditValuesGatherer : public QThread
{
    Q_OBJECT
 
  public:
    QgsFieldValuesLineEditValuesGatherer( QgsVectorLayer *layer, int attributeIndex )
      : mLayer( layer )
      , mAttributeIndex( attributeIndex )
    {}

    void setSubstring( const QString &string ) { mSubstring = string; }
 
    void run() override;

    void stop();

    bool wasCanceled() const { return mWasCanceled; }
 
  signals:

    void collectedValues( const QStringList &values );
 
  private:
    QgsVectorLayer *mLayer = nullptr;
    int mAttributeIndex;
    QString mSubstring;
    QStringList mValues;
    QgsFeedback *mFeedback = nullptr;
    QMutex mFeedbackMutex;
    bool mWasCanceled = false;
};

 
#endif

class GUI_EXPORT QgsFieldValuesLineEdit : public QgsFilterLineEdit
{
    Q_OBJECT
 
    Q_PROPERTY( QgsVectorLayer *layer READ layer WRITE setLayer NOTIFY layerChanged )
    Q_PROPERTY( int attributeIndex READ attributeIndex WRITE setAttributeIndex NOTIFY attributeIndexChanged )
 
  public:
    QgsFieldValuesLineEdit( QWidget *parent SIP_TRANSFERTHIS = nullptr );
 
    ~QgsFieldValuesLineEdit() override;

    void setLayer( QgsVectorLayer *layer );

    QgsVectorLayer *layer() const { return mLayer; }

    void setAttributeIndex( int index );

    int attributeIndex() const { return mAttributeIndex; }
 
  signals:

    void layerChanged( QgsVectorLayer *layer );

    void attributeIndexChanged( int index );
 
  private slots:

    void requestCompleterUpdate();

    void triggerCompleterUpdate();

    void updateCompleter( const QStringList &values );

    void gathererThreadFinished();
 
  private:
    QgsVectorLayer *mLayer = nullptr;
    int mAttributeIndex = -1;

    bool mUpdateRequested = false;

    QTimer mShowPopupTimer;

    QgsFieldValuesLineEditValuesGatherer *mGatherer = nullptr;

    QString mRequestedCompletionText;

    void updateCompletionList( const QString &substring );
};
 
 
#endif //QGSFIELDVALUESLINEEDIT_H