PySide2 widget's deleteLater() method not working in modal operator #109650

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Tristan-Languebien · 2023-07-03T14:46:37+02:00

2023-07-03 14:46:37 +02:00

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 980 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.18

Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: e1ccd9d4a1d3
Worked: (newest version of Blender that worked as expected)

Short description of error
The deleteLater() method does't seem to work when the show() method of a PySide2 widget is called.
Oddly enough, the deleteLater() method works fine after that (when it is called from a signal for instance). Something seems to be off with the event loop...
You can try this out with the code below, just make sure to comment out "self.remove_label()" if you want to try the button

Exact steps for others to reproduce the error

from typing import Set
import bpy
from bpy.types import Context, Operator
from PySide2.QtWidgets import QVBoxLayout, QPushButton, QLabel, QWidget

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.main_layout = QVBoxLayout()
        self.setLayout(self.main_layout)
        self.label = QLabel("Delete me")
        self.button = QPushButton("Test")
        self.main_layout.addWidget(self.button)
        self.main_layout.addWidget(self.label)
        self.remove_label() # Doesn't work
        self.button.clicked.connect(self.remove_label) # Works (the previous line must be commented out)
        
    def remove_label(self):
        self.label.deleteLater()
        print(self.label)

class PYSIDE2_OT_openWidget(Operator):
    bl_idname = "pyside2.widget"
    bl_label = "Pyside2 Widget"
    bl_description = "PySide2 widget, only for demonstration purposes"

    def execute(self, context: Context) -> Set[str]:
        self.widget = MyWidget()
        self.widget.show()
        return {'RUNNING_MODAL'}

def register():
    bpy.utils.register_class(PYSIDE2_OT_openWidget)

def unregister():
    bpy.utils.unregister_class(PYSIDE2_OT_openWidget)

if __name__ == "__main__":
    register()

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 980 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.18 **Blender Version** Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: `e1ccd9d4a1d3` Worked: (newest version of Blender that worked as expected) **Short description of error** The deleteLater() method does't seem to work when the show() method of a PySide2 widget is called. Oddly enough, the deleteLater() method works fine after that (when it is called from a signal for instance). Something seems to be off with the event loop... You can try this out with the code below, just make sure to comment out "self.remove_label()" if you want to try the button **Exact steps for others to reproduce the error** ```Py from typing import Set import bpy from bpy.types import Context, Operator from PySide2.QtWidgets import QVBoxLayout, QPushButton, QLabel, QWidget class MyWidget(QWidget): def __init__(self): super().__init__() self.main_layout = QVBoxLayout() self.setLayout(self.main_layout) self.label = QLabel("Delete me") self.button = QPushButton("Test") self.main_layout.addWidget(self.button) self.main_layout.addWidget(self.label) self.remove_label() # Doesn't work self.button.clicked.connect(self.remove_label) # Works (the previous line must be commented out) def remove_label(self): self.label.deleteLater() print(self.label) class PYSIDE2_OT_openWidget(Operator): bl_idname = "pyside2.widget" bl_label = "Pyside2 Widget" bl_description = "PySide2 widget, only for demonstration purposes" def execute(self, context: Context) -> Set[str]: self.widget = MyWidget() self.widget.show() return {'RUNNING_MODAL'} def register(): bpy.utils.register_class(PYSIDE2_OT_openWidget) def unregister(): bpy.utils.unregister_class(PYSIDE2_OT_openWidget) if __name__ == "__main__": register() ```

Tristan-Languebien added the

labels 2023-07-03 14:46:38 +02:00

YimingWu commented

2023-07-04 04:04:31 +02:00

You probably need to report this issue to PySide instead of Blender since Blender doesn't come with PySide and its accompanying libraries.

Also there's likely a problem with how you wrote the modal operator, you didn't have a modal() call but have a return {'RUNNING_MODAL'}, blender will not continue executing anything from here. You could checkout Templates -> Python -> Operator Modal for reference. Thanks.

Will close this issue for now, but feel free to comment on more information you get. Thanks!

You probably need to report this issue to PySide instead of Blender since Blender doesn't come with PySide and its accompanying libraries. Also there's likely a problem with how you wrote the modal operator, you didn't have a modal() call but have a `return {'RUNNING_MODAL'}`, blender will not continue executing anything from here. You could checkout `Templates -> Python -> Operator Modal` for reference. Thanks. Will close this issue for now, but feel free to comment on more information you get. Thanks!

YimingWu closed this issue

2023-07-04 04:04:33 +02:00

Blender Bot added

and removed

labels 2023-07-04 04:04:35 +02:00

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