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I'm trying to develop a similar script to How to make serial maps from template?. I'd like to modify elements in the composition programmatically for each map that I want to print. In developing this I'd like to see the elements I'm modifying in the console without printing off the map. I was expecting to see a new print composer window open when I ran the below code from the QGIS console in 2.18.2, but nothing happens (no error message appears either).

from qgis.PyQt.QtXml import QDomDocument
def loadPrintComposerTemplate(template):
    '''Load a print composer template from provided filename argument
    
    Args:
        template: readable .qpt template filename
        
    Returns:
        myComposition: a QgsComposition loaded from the provided template
        mapSettings: a QgsMapSettings object associated with myComposition'''
    mapSettings = QgsMapSettings()
    myComposition = QgsComposition(mapSettings)
    # Load template from filename
    with open(template, 'r') as templateFile:
        myTemplateContent = templateFile.read()
    
    myDocument = QDomDocument()
    myDocument.setContent(myTemplateContent)
    return myComposition.loadFromTemplate(myDocument), mapSettings
composer, mapSet = loadPrintComposerTemplate(template)

Is there a way to make the print composer appear?

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2 Answers 2

Reset to default
4

The API has changed for QGIS3 :

from qgis.core import QgsComposition, QgsProject
composition = QgsComposition(QgsProject.instance())
composition.loadFromTemplate(template_qdoc)
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  • 1
    QgsComposition is not available anymore in recent qgis releases
    – luca76
    Jul 20, 2020 at 12:22
  • do you know to which class it was changed, @luca76?
    – MoritzMoreira
    Jul 24 at 8:39
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To open the new composer

from qgis.utils import iface
newcomp = iface.createNewComposer()

Load the template into the composer

newcomp.composition().loadFromTemplate(myDocument)

Has been taken from Here. Works in 2.18.2

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  • Based on a reading of the documents one might think that loading the template into a QgsComposition and then using newcomp.setComposition(myComposition) would produce the same results. But I'm noting missing elements on the composer page, and the Items list is empty in the composer window
    – raphael
    Dec 30, 2016 at 18:25
  • Also note that newcomp.composerWindow() has a hide() and show() method
    – raphael
    Jan 16, 2017 at 16:51

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