QGIS API Documentation 3.27.0-Master (95e00c50d2)
qgsvirtuallayertask.h
Go to the documentation of this file.
1/***************************************************************************
2 qgsvirtuallayertask.h - description
3 -------------------
4 begin : Jan 19, 2018
5 copyright : (C) 2017 by Paul Blottiere
7 ***************************************************************************/
8
9/***************************************************************************
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 ***************************************************************************/
17
18#ifndef QGSVIRTUALLAYERTASK_H
19#define QGSVIRTUALLAYERTASK_H
20
22#include "qgstaskmanager.h"
23#include "qgsvectorlayer.h"
24
33class CORE_EXPORT QgsVirtualLayerTask : public QgsTask
34{
35 Q_OBJECT
36
37 public:
38
44
48 QgsVectorLayer *layer();
49
53 QgsVectorLayer *takeLayer();
54
58 QgsVirtualLayerDefinition definition() const;
59
64 bool run() override;
65
69 void cancel() override;
70
75 QString exceptionText() const;
76
81 void setExceptionText( const QString &exceptionText );
82
83 private:
84 QString mExceptionText;
85 QgsVirtualLayerDefinition mDefinition;
86 std::unique_ptr<QgsVectorLayer> mLayer;
87};
88
89#endif // QGSVECTORLAYERTASK_H
Abstract base class for long running background tasks.
virtual bool run()=0
Performs the task's operation.
virtual void cancel()
Notifies the task that it should terminate.
Represents a vector layer which manages a vector based data sets.
Class to manipulate the definition of a virtual layer.
Initializes a virtual layer with postpone mode activated and reloads the data in a separated thread.