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Add checkbox to only load wfs features intersecting the current canva… 
…s extent. Funded by Sourcepole QGIS Enterprise
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@mhugent
mhugent committed Apr 2, 2015
1 parent c3321e5 commit e4e4839
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Showing 3 changed files with 97 additions and 83 deletions.
5 changes: 5 additions & 0 deletions src/providers/wfs/qgswfsprovider.cpp
View file
Expand Up @@ -122,11 +122,16 @@ QgsWFSProvider::QgsWFSProvider( const QString& uri )
setDataSourceUri( bkUri );
}

#if 0 //non-cached mode is broken
mCached = !uri.contains( "BBOX=" );
if ( mCached )
{ //"Cache Features" option; get all features in layer immediately
reloadData();
} //otherwise, defer feature retrieval until layer is first rendered
#endif //0

mCached = true;
reloadData();

if ( mValid )
{
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4 changes: 3 additions & 1 deletion src/providers/wfs/qgswfssourceselect.cpp
View file
Expand Up @@ -403,8 +403,10 @@ void QgsWFSSourceSelect::addLayer()
layerName = titleName;
}
QgsDebugMsg( "Layer " + typeName + " Filter is " + filter );

//is "cache features" checked?
if ( mModel->item( row, 3 )->checkState() == Qt::Checked )
//non-cached mode does not work anymore
if ( !cbxFeatureCurrentViewExtent->isChecked() && mModel->item( row, 3 )->checkState() == Qt::Checked )
{ //yes: entire WFS layer will be retrieved and cached
mUri = conn.uriGetFeature( typeName, pCrsString, filter );
}
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171 changes: 89 additions & 82 deletions src/ui/qgswfssourceselectbase.ui
View file
Expand Up @@ -14,7 +14,7 @@
<string>Add WFS Layer from a Server</string>
</property>
<layout class="QGridLayout" name="gridLayout">
<item row="5" column="0">
<item row="6" column="0">
<widget class="QDialogButtonBox" name="buttonBox">
<property name="orientation">
<enum>Qt::Horizontal</enum>
Expand All @@ -24,84 +24,6 @@
</property>
</widget>
</item>
<item row="4" column="0">
<widget class="QGroupBox" name="gbCRS">
<property name="title">
<string>Coordinate reference system</string>
</property>
<layout class="QHBoxLayout">
<property name="spacing">
<number>6</number>
</property>
<property name="margin">
<number>9</number>
</property>
<item>
<widget class="QLabel" name="labelCoordRefSys">
<property name="text">
<string/>
</property>
</widget>
</item>
<item>
<spacer>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeType">
<enum>QSizePolicy::Expanding</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>441</width>
<height>23</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QPushButton" name="btnChangeSpatialRefSys">
<property name="enabled">
<bool>false</bool>
</property>
<property name="text">
<string>Change...</string>
</property>
</widget>
</item>
</layout>
</widget>
</item>
<item row="1" column="0">
<layout class="QHBoxLayout" name="horizontalLayoutFilter">
<item>
<widget class="QLabel" name="labelFilter">
<property name="enabled">
<bool>true</bool>
</property>
<property name="text">
<string>Filter:</string>
</property>
<property name="buddy">
<cstring>lineFilter</cstring>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="lineFilter">
<property name="enabled">
<bool>true</bool>
</property>
<property name="toolTip">
<string>Display WFS FeatureTypes containing this word in the title, name or abstract</string>
</property>
<property name="whatsThis">
<string>Display WFS FeatureTypes containing this word in the title, name or abstract</string>
</property>
</widget>
</item>
</layout>
</item>
<item row="0" column="0">
<widget class="QGroupBox" name="GroupBox1">
<property name="title">
Expand Down Expand Up @@ -191,6 +113,61 @@
</layout>
</widget>
</item>
<item row="5" column="0">
<widget class="QGroupBox" name="gbCRS">
<property name="title">
<string>Coordinate reference system</string>
</property>
<layout class="QHBoxLayout">
<property name="spacing">
<number>6</number>
</property>
<property name="margin">
<number>9</number>
</property>
<item>
<widget class="QLabel" name="labelCoordRefSys">
<property name="text">
<string/>
</property>
</widget>
</item>
<item>
<spacer>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeType">
<enum>QSizePolicy::Expanding</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>441</width>
<height>23</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QPushButton" name="btnChangeSpatialRefSys">
<property name="enabled">
<bool>false</bool>
</property>
<property name="text">
<string>Change...</string>
</property>
</widget>
</item>
</layout>
</widget>
</item>
<item row="3" column="0">
<widget class="QCheckBox" name="cbxUseTitleLayerName">
<property name="text">
<string>Use title for layer name</string>
</property>
</widget>
</item>
<item row="2" column="0">
<widget class="QTreeView" name="treeView">
<property name="editTriggers">
Expand All @@ -210,10 +187,40 @@
</attribute>
</widget>
</item>
<item row="3" column="0">
<widget class="QCheckBox" name="cbxUseTitleLayerName">
<item row="1" column="0">
<layout class="QHBoxLayout" name="horizontalLayoutFilter">
<item>
<widget class="QLabel" name="labelFilter">
<property name="enabled">
<bool>true</bool>
</property>
<property name="text">
<string>Filter:</string>
</property>
<property name="buddy">
<cstring>lineFilter</cstring>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="lineFilter">
<property name="enabled">
<bool>true</bool>
</property>
<property name="toolTip">
<string>Display WFS FeatureTypes containing this word in the title, name or abstract</string>
</property>
<property name="whatsThis">
<string>Display WFS FeatureTypes containing this word in the title, name or abstract</string>
</property>
</widget>
</item>
</layout>
</item>
<item row="4" column="0">
<widget class="QCheckBox" name="cbxFeatureCurrentViewExtent">
<property name="text">
<string>Use title for layer name</string>
<string>Only request features overlapping thencurrent view extent</string>
</property>
</widget>
</item>
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4 comments on commit e4e4839

@rduivenvoorde
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Never did a comment on a commit :-)

But @mhugent this commit breaks our use case of WFS's and in my opinion does not add something to the old implementation. See for example:

http://hub.qgis.org/issues/13117

and this thread

https://lists.osgeo.org/pipermail/qgis-developer/2015-October/040038.html

can we discuss about this one?

@mhugent
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Did you really try a compile without that commit? The uncached mode (subsequently downloading features) was broken during multithreaded rendering. What this commit adds is a convenient way to load the features crossing the current view extent into memory (without writing the BBOX by hand). The checkbox was already there earlier an a lot of people wanted it back.

@rduivenvoorde
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Hi @mhugent , thanks for your anwer, I thought you introduced this option.

Nope, sorry. Did not do that try to compile with that commit, but Multithreading was introduced when? Because 2.8.3 is still working as we expect/want.
Maybe have a chat about this during hackfest?

@mhugent
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Nope, sorry. Did not do that try to compile with that commit, but Multithreading was introduced when?

Afaik in 2.4. And loading while zooming / panning also does not work for me when removing the few lines of this commit with current master. But if it works for you without this commit, I'll be happy to revert those lines.

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