Hi Julierme,
that's another and not a new problem, the button-widget and setFixedSize
did not work before and even do not work in standalone-python outside QGis.
The reason is quite simple, we overlooked it before: double-underscores
for the __init__-functions.
Here the running code, which does what You want (commented lines for
QGis-usage, uncomment for standalone):
import sys
from PyQt5.QtCore import (QSize, Qt)
from PyQt5.QtWidgets import (QApplication,
QWidget,
QPushButton,
QMainWindow)
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.setWindowTitle("My App")
button = QPushButton("Press Me!")
self.setCentralWidget(button)
self.setFixedSize(QSize(400, 300))
#app = QApplication(sys.argv)
window = MainWindow()
window.show()
#app.exec()
hth
Ludwig
Am 17.08.23 um 04:14 schrieb 1520 gis:
Hi Ludwig,
Thank you very much for your reply. You're right, QGIS stopped
crashing, but now the button widget is not being carried out by the
application window and neither the methods are working properly like
the self.setFixedSize(QSize(400,300)). I am sending a window
screenshot in attachment.
I appreciated your time and help.
Kind regards
Julierme
On Wed, Aug 16, 2023 at 4:07 PM Ludwig Kniprath via QGIS-User
<[email protected]> wrote:
Hi Julierme,
I think Your problem is, that You try to create a new application
with "app = QApplication(sys.argv)" inside a running QGis, which
already is a running Qt-application.
Simplified code should perform without crash:
import sys
from PyQt5.QtCore import (QSize,Qt)
from PyQt5.QtWidgets import (QApplication, QWidget, QPushButton,
QMainWindow)
class MainWindow(QMainWindow):
def _init_(self):
super()._init_()
self.setWindowTitle("My App")
button = QPushButton("Press Me!")
self.setCentralWidget(button)
self.setFixedSize(QSize(400,300))
window = MainWindow()
window.show()
hth
Ludwig
Am 16.08.23 um 19:15 schrieb 1520 gis via QGIS-User:
Hi all,
I wrote the PyQt script below and I am running it through QGIS3.
When I run it for the first time after opening it in QGIS3, the
application's window pops up smoothly. However, when I close the
window and run the script, QGIS3 readily quits. That may be
something related to the event loop, but I'm unsure and don't
know how to stop the QGIS3 shutdown for the subsequent runs. Any
hint on how to fix this issue will be very appreciated.
import sys
from PyQt5.QtCore import (QSize,
Qt)
from PyQt5.QtWidgets import (QApplication,
QWidget,
QPushButton,
QMainWindow)
class MainWindow(QMainWindow):
def _init_(self):
super()._init_()
self.setWindowTitle("My App")
button = QPushButton("Press Me!")
self.setCentralWidget(button)
self.setFixedSize(QSize(400,300))
app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec()
--
##########################################
*Julierme G Pinheiro*
*SDI Expert & Geoprocessing Specialist*
Phone: +55 61 99994-3569
Website: GIS
<https://www.udemy.com/course/qgis-server-para-iniciantes-instalacao-e-configuracao/>
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--
##########################################
*Julierme G Pinheiro*
*SDI Expert & Geoprocessing Specialist*
Phone: +55 61 99994-3569
Website: GIS
<https://www.udemy.com/course/qgis-server-para-iniciantes-instalacao-e-configuracao/>
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[email protected]
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