QgsFeedback can handle report progress reports

python/core/qgsfeedback.sip

@@ -36,8 +36,15 @@ class QgsFeedback : QObject
     //! Tells whether the operation has been canceled already
     bool isCanceled() const;
 
+    void setProgress( double progress );
+
+    double progress() const;
+
   signals:
     //! Internal routines can connect to this signal if they use event loop
     void canceled();
 
+    void progressChanged( double progress );
+
+
 };

src/core/qgsfeedback.h

@@ -61,13 +61,44 @@ class CORE_EXPORT QgsFeedback : public QObject
     //! Tells whether the operation has been canceled already
     bool isCanceled() const { return mCanceled; }
 
+    /**
+     * Sets the current progress for the feedback object. The \a progress
+     * argument is in percentage and valid values range from 0-100.
+     * @see progress()
+     * @see progressChanged()
+     * @note added in QGIS 3.0
+     */
+    void setProgress( double progress ) { mProgress = progress; emit progressChanged( mProgress ); }
+
+    /**
+     * Returns the current progress reported by the feedback object. Depending on how the
+     * feedback object is used progress reporting may not be supported. The returned value
+     * is in percentage and ranges from 0-100.
+     * @see setProgress()
+     * @see progressChanged()
+     * @note added in QGIS 3.0
+     */
+    double progress() const { return mProgress; }
+
   signals:
     //! Internal routines can connect to this signal if they use event loop
     void canceled();
 
+    /**
+     * Emitted when the feedback object reports a progress change. Depending on how the
+     * feedback object is used progress reporting may not be supported. The \a progress
+     * argument is in percentage and ranges from 0-100.
+     * @note added in QGIS 3.0
+     * @see setProgress()
+     * @see progress()
+     */
+    void progressChanged( double progress );
+
   private:
     //! Whether the operation has been canceled already. False by default.
     bool mCanceled;
+
+    double mProgress = 0.0;
 };
 
 #endif // QGSFEEDBACK_H

tests/src/python/CMakeLists.txt

@@ -50,6 +50,7 @@ ADD_PYTHON_TEST(PyQgsFieldFormattersTest test_qgsfieldformatters.py)
 ADD_PYTHON_TEST(PyQgsFillSymbolLayers test_qgsfillsymbollayers.py)
 ADD_PYTHON_TEST(PyQgsProject test_qgsproject.py)
 ADD_PYTHON_TEST(PyQgsFeatureIterator test_qgsfeatureiterator.py)
+ADD_PYTHON_TEST(PyQgsFeedback test_qgsfeedback.py)
 ADD_PYTHON_TEST(PyQgsField test_qgsfield.py)
 ADD_PYTHON_TEST(PyQgsFieldModel test_qgsfieldmodel.py)
 ADD_PYTHON_TEST(PyQgsFilterLineEdit test_qgsfilterlineedit.py)

tests/src/python/test_qgsfeedback.py

@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+"""QGIS Unit tests for QgsFeedback.
+
+.. note:: 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.
+"""
+__author__ = 'Nyall Dawson'
+__date__ = '12/02/2017'
+__copyright__ = 'Copyright 2017, The QGIS Project'
+# This will get replaced with a git SHA1 when you do a git archive
+__revision__ = '$Format:%H$'
+
+import qgis  # NOQA
+import os
+
+from qgis.core import (QgsFeedback)
+from qgis.PyQt.QtTest import QSignalSpy
+from qgis.testing import unittest
+
+
+class TestQgsFeedback(unittest.TestCase):
+
+    def testCancel(self):
+        f = QgsFeedback()
+        self.assertFalse(f.isCanceled())
+
+        cancel_spy = QSignalSpy(f.canceled)
+
+        f.cancel()
+        self.assertTrue(f.isCanceled())
+        self.assertEqual(len(cancel_spy), 1)
+
+    def testProgress(self):
+        f = QgsFeedback()
+        self.assertEqual(f.progress(), 0.0)
+
+        progress_spy = QSignalSpy(f.progressChanged)
+
+        f.setProgress(25)
+        self.assertEqual(f.progress(), 25.0)
+        self.assertEqual(len(progress_spy), 1)
+        self.assertEqual(progress_spy[0][0], 25.0)
+
+
+if __name__ == '__main__':
+    unittest.main()