QGIS print file title

Question

How to automatically make the title of your print equal to the name of the printed layer? Tried by using the next piece of code, but it doesn't work (QGIS 3.X):

from qgis.core import *
from qgis.gui import *

@qgsfunction(args='auto', group='Custom')
def func(feature, parent):
    root = QgsProject.instance().layerTreeRoot()
    layer = qgis.utils.iface.activeLayer()
    lyr = root.findLayer(QgsProject.instance().mapLayersByName(layer.name())[0].id())
    group = lyr.parent().name()
    if group != '':
        return lyr.parent().name()
    else:
        return 'Group not found'

Answer 1

to get the active layer name, you can only use this part of your code:

def activeLayerName(feature, parent):
    layer = qgis.utils.iface.activeLayer().name()
    return layer

Answer 2

To include the printed layer in a text in your QGIS layout template, you can use an expression to dynamically retrieve the layer name and insert it into the text element.

Here are the steps:

Add a Text element to your QGIS layout template where you want the layer name to appear.

Double click on the text element to enter edit mode.

In the text editor, type the following expression:

[% @layer_name %]

Click "OK" to save the text element.

Now, when you export or print the layout using this template, the text element will automatically display the name of the layer. If you have multiple layers and want to include the names of all of them, you can modify the expression to include the names of all the layers. For example:

[% @layer_name || ', ' || @atlas_pagename %]

This will concatenate the names of all layers, separated by commas. You can adjust the expression as needed to achieve the desired output.