Showing the number of currently selected layers in QGIS

Question

Although this should seem to be very straightforward, I cannot find out how to see the number of layers I have currently selected in QGIS. For example, in the example below I want to see somewhere in the GUI the number 5, or be able to somehow retrieve this number:

Obviously, with only five layers selected, I can directly see how many layers I have selected. However, with a lot of layers, it can become an arduous task if I have to count each layer myself. I want to quickly compare the number of layers I have in two different sets of layers. Ideally, I would also be able to see the number of layers within a layer (sub)group (e.g. "Input [X]", where 'X' is the number of layers in the group).

Is there something I should change in the QGIS View settings? Or is there any other method to quickly retrieve this number?

score 23 · Accepted Answer · edited Feb 04 '23 at 08:27

23

You can use this script. It adds a toolbar as seen in the image and shows how many layers are selected.

label = QLabel("Selected Layers Count:")
count = QLabel()
tree_view = iface.layerTreeView()
c = len(tree_view.selectedLayers())
count.setText(str(c))
tb = iface.addToolBar("Selected layers")
tb.addWidget(label)
tb.addWidget(count)
def show_selected_layers_count():
    c = len(tree_view.selectedLayers())
    count.setText(str(c))
tree_view.selectionModel().selectionChanged.connect(show_selected_layers_count)

edited Feb 04 '23 at 08:27

Taras

32,823
4
66
137

answered Jan 17 '23 at 10:38

Kadir Şahbaz

76,800
56
247
389

Very nice! Where do you run the script and does it persist when open/closing QGIS? – djq Jan 17 '23 at 11:07
1

Check this out : Running Python code when QGIS starts – Kadir Şahbaz Jan 17 '23 at 11:15

score 16 · Answer 2 · edited Feb 04 '23 at 08:26

To extend the great solution by @Kadir Şahbaz, you could do something like this to get a count per group:

p = QgsProject.instance()
root = p.layerTreeRoot()
view = iface.layerTreeView()
TOOLBAR
tb = iface.addToolBar("Selected layers")
def show_selected_layers_count():
    tb.clear()
    tb.addWidget(QLabel('Selected layers per group:      '))
    for child in root.children():
        if root.isGroup(child):
            label = QLabel(f'{child.name()}: ')
            selected_layers = []
            for selectedLayer in view.selectedNodes():
                if selectedLayer.parent() == child:
                    selected_layers.append(selectedLayer)
        count = len(selected_layers)

        count_label = QLabel(str(count) + '    ')
        tb.addWidget(label)
        tb.addWidget(count_label)


con = view.selectionModel().selectionChanged.connect(show_selected_layers_count)
to disconnect the function from the signal
#view.selectionModel().selectionChanged.disconnect(con)

It currently works with 1st level groups. It will need some modification to work with sub-groups, let me know if you need me to update the function — Matt, Jan 17 '23 at 14:59

Showing the number of currently selected layers in QGIS

2 Answers2

TOOLBAR

to disconnect the function from the signal

Linked