PyQGIS zoom using PyQt list widget

Question

I have created a layer filter Expression to get specific results query from my layer and I add these results in a list widget using PyQt.

My Expression and my add to list widget work fine (I print correct ids and I see those ids in list widget).

However, if I want to zoom to a feature using double click signal in the list widget then it zooms to the wrong features (features where my Expression is False). Any idea what I have wrong in my code?

My code:

__init__ 
self.connect(self.ui.listWidget, SIGNAL("itemDoubleClicked (QListWidgetItem 
*)"), self.Zoomt) 

My filter:

def myfilter(self): 
    layer = QgsMapLayerRegistry.instance().mapLayersByName("mylayrt")[0] 
    request = QgsFeatureRequest().setFilterExpression('"name" =\'{0}\''.format(myname)) 
    for feature in layer.getFeatures(request): 
        print str(feature.attribute("myid")) 
        self.ui.listWidget.addItem(str(feature.attribute("myid"))) 

Result print:

1 
42 
43 
44 
45 
96 
111 
304 
458 
508 
579 
602 
606 
646 

That is ids are added correctly in the list widget (14 ids).

Zoom button:

def Zoomt(self): 
    Vl_Gs = QgsMapLayerRegistry.instance().mapLayersByName("mylayer")[0] 
    Vl_Gs.removeSelection 
    Vl_Gs.setSelectedFeatures([self.ui.listWidget.currentRow()]) 
    self.mapCanvas.zoomToSelected(Vl_Gs) 

Zoom ids (take first 14 from my layer):

0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 

Ids len number is correct but the ids zoom is wrong, why?

Answer 1

When setting selected features, you will need the id of those features. You're using Vl_Gs.setSelectedFeatures([self.ui.listWidget.currentRow()]) which only gets the index value of the listwidget row. What you could do is create another feature request and match the feature's attribute with the selected item. Maybe something like:

def Zoomt(self): 
    Vl_Gs = QgsMapLayerRegistry.instance().mapLayersByName("mylayer")[0] 
    expr = QgsExpression('"name" =\'{0}\''.format(self.ui.listWidget.currentItem().text()))
    selection = Vl_Gs.getFeatures(QgsFeatureRequest(expr))
    ids = [s.id() for s in selection]
    Vl_Gs.selectByIds(ids)
    self.mapCanvas().zoomToSelected(Vl_Gs)

---

Note that the method QgsVectorLayer::setSelectedFeatures() has been depreciated in 2.18 and you should instead use QgsVectorLayer::selectByIds().

---

Edit:

If using QGIS < 2.16, use setSelectedFeatures() (which you have originally used) so replace the following line:

Vl_Gs.selectByIds(ids) 

with

Vl_Gs.setSelectedFeatures(ids)