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Add method to retrieve dependent layers for map renderer cached images

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This commit is contained in:
Nyall Dawson 2017-02-06 11:27:07 +10:00
parent 748acc6790
commit aa392dc23a
4 changed files with 37 additions and 0 deletions
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2
python/core/qgsmaprenderercache.sip
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@ -18,6 +18,8 @@ class QgsMapRendererCache : QObject
QImage cacheImage( const QString& cacheKey ) const;
QList< QgsMapLayer* > dependentLayers( const QString& cacheKey ) const;
void clearCacheImage( const QString& cacheKey );
};

9
src/core/qgsmaprenderercache.cpp
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@ -129,6 +129,15 @@ QImage QgsMapRendererCache::cacheImage( const QString& cacheKey ) const
return mCachedImages.value( cacheKey ).cachedImage;
}
QList< QgsMapLayer* > QgsMapRendererCache::dependentLayers( const QString& cacheKey ) const
{
if ( mCachedImages.contains( cacheKey ) )
{
return _qgis_listQPointerToRaw( mCachedImages.value( cacheKey ).dependentLayers );
}
return QList< QgsMapLayer* >();
}
void QgsMapRendererCache::layerRequestedRepaint()
{
QgsMapLayer* layer = qobject_cast<QgsMapLayer*>( sender() );

6
src/core/qgsmaprenderercache.h
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@ -84,6 +84,12 @@ class CORE_EXPORT QgsMapRendererCache : public QObject
*/
QImage cacheImage( const QString& cacheKey ) const;
/**
* Returns a list of map layers on which an image in the cache depends.
* @note added in QGIS 3.0
*/
QList< QgsMapLayer* > dependentLayers( const QString& cacheKey ) const;
/**
* Removes an image from the cache with matching \a cacheKey.
* @see clear()

20
tests/src/python/test_qgsmaprenderercache.py
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@ -192,6 +192,26 @@ class TestQgsMapRendererCache(unittest.TestCase):
self.assertFalse(cache.cacheImage('nolayer').isNull())
self.assertEqual(cache.cacheImage('nolayer'), im1)
def testDependentLayers(self):
# bad layer tests
cache = QgsMapRendererCache()
self.assertEqual(cache.dependentLayers('not a layer'), [])
layer1 = QgsVectorLayer("Point?field=fldtxt:string",
"layer1", "memory")
layer2 = QgsVectorLayer("Point?field=fldtxt:string",
"layer2", "memory")
im = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('no depends', im, [])
self.assertEqual(cache.dependentLayers('no depends'), [])
cache.setCacheImage('depends', im, [layer1, layer2])
self.assertEqual(set(cache.dependentLayers('depends')), set([layer1, layer2]))
# try deleting a layer in the meantime..
layer2 = None
self.assertEqual(set(cache.dependentLayers('depends')), set([layer1]))
if __name__ == '__main__':
unittest.main()