Zooming to selected feature using PyQGIS

Question

I want to create a function that selects a feature and zooms to it (similar in QGIS). Therefore there is following function:

QgsMapLayerRegistry.instance().addMapLayer(self.vlayer)
def zoomTo(self):
    layer = self.vlayer
    atable = self.ui.table
selectList=[]
for i in atable.selectionModel().selectedRows():
    ID = atable.item(i.row(),0).text()
    selectList.append(int(ID))

layer.setSelectedFeatures(selectList)

The selected features are highlighted on the map. But I have no idea how to make a "zoom" to the selected features or some kind of focus them in the middle of the map.

Answer 1

You need to set the extents of the map canvas to the extents of the selections:

box = layer.boundingBoxOfSelected()
iface.mapCanvas().setExtent(box)
iface.mapCanvas().refresh()

Answer 2

Zoom to selected features can also be performed by triggering the "Zoom to Selection" option of View menu.

eMenu = self.iface.viewMenu()
eMenu.actions() [12].trigger()

Note: The index number may vary with different QGIS versions.

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Or more directly:

iface.actionZoomToSelected().trigger()

Answer 3

# The first a QMessageBox display all selected features:

lyr = iface.activeLayer();
fts = lyr.selectedFeatures();
ftsCount = lyr.selectedFeatureCount();
sFts = str(ftsCount);
msgBox = QMessageBox();
msgBox.setText(sFts +' selected features');
msgBox.exec_();

# Second zoom to selected features:

iface.actionZoomToSelected().trigger();