2.8: Python API: window's workspace can't be set in Application timer #71383

New Issue

Ian Henderson · 2019-11-06T15:03:33+01:00

Ian Henderson commented

2019-11-06 15:03:33 +01:00

System Information
Operating system: Darwin-18.7.0-x86_64-i386-64bit 64 Bits
Graphics card: Intel HD Graphics 5000 OpenGL Engine Intel Inc. 4.1 INTEL-12.10.12

Blender Version
Broken: version: 2.82 (sub 1), branch: master (modified), commit date: 2019-10-31 23:45, hash: c11d3c1b92
Worked: (optional)

Short description of error
In an app-level timer, trying to set the workspace on a window doesn't work. It looks like the call to WM_event_add_notifier in rna_Window_workspace_update always dispatches events to the context's current window rather than the Window object whose workspace attribute is being changed.

Exact steps for others to reproduce the error
Run this script in the Scripting workspace:

import bpy
def tick():
    bpy.context.window_manager.windows[0].workspace = bpy.data.workspaces['Shading']
    return 0
bpy.app.timers.register(tick)

Running the script does not switch workspaces to the Shading workspace. Calling the tick() function directly switches workspaces as expected.

**System Information** Operating system: Darwin-18.7.0-x86_64-i386-64bit 64 Bits Graphics card: Intel HD Graphics 5000 OpenGL Engine Intel Inc. 4.1 INTEL-12.10.12 **Blender Version** Broken: version: 2.82 (sub 1), branch: master (modified), commit date: 2019-10-31 23:45, hash: `c11d3c1b92` Worked: (optional) **Short description of error** In an app-level timer, trying to set the workspace on a window doesn't work. It looks like the call to `WM_event_add_notifier` in `rna_Window_workspace_update` always dispatches events to the context's current window rather than the `Window` object whose workspace attribute is being changed. **Exact steps for others to reproduce the error** Run this script in the Scripting workspace: ``` import bpy def tick(): bpy.context.window_manager.windows[0].workspace = bpy.data.workspaces['Shading'] return 0 bpy.app.timers.register(tick) ``` Running the script does not switch workspaces to the Shading workspace. Calling the `tick()` function directly switches workspaces as expected.

Ian Henderson commented

2019-11-06 15:03:33 +01:00

Added subscriber: @ianh

Philipp Oeser commented

2019-11-07 13:09:40 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-11-07 13:09:40 +01:00

Can confirm.

However you can use the workaround from #62074 (2.8: Python API: crash due to missing window context in Application timer) which is using an operator with custom context in the timer. This seems to work nicely:

import bpy

class TestOperator(bpy.types.Operator):
    bl_idname = "scene.test_operator"
    bl_label = "Test Operator"

    def execute(self, context):
        context.window.workspace = bpy.data.workspaces['Shading']
        return {'FINISHED'}

bpy.utils.register_class(TestOperator)

def tick():
    window = bpy.context.window_manager.windows[0]
    ctx = {'window': window, 'screen': window.screen}  
    bpy.ops.scene.test_operator(ctx)
    
    return 5.0

bpy.app.timers.register(tick)

Can confirm. However you can use the workaround from #62074 (2.8: Python API: crash due to missing window context in Application timer) which is using an operator with custom context in the timer. This seems to work nicely: ``` import bpy class TestOperator(bpy.types.Operator): bl_idname = "scene.test_operator" bl_label = "Test Operator" def execute(self, context): context.window.workspace = bpy.data.workspaces['Shading'] return {'FINISHED'} bpy.utils.register_class(TestOperator) def tick(): window = bpy.context.window_manager.windows[0] ctx = {'window': window, 'screen': window.screen} bpy.ops.scene.test_operator(ctx) return 5.0 bpy.app.timers.register(tick) ```

Philipp Oeser changed title from ~~A window's workspace can't be set during app-level timer callbacks~~ to 2.8: Python API: window's workspace can't be set in Application timer

2019-11-07 13:11:24 +01:00

blender-admin commented

2020-09-18 09:57:21 +02:00

This issue was referenced by bda6eb1e27

This issue was referenced by bda6eb1e27b8e2902b1336101f44a71a7be235c7

Campbell Barton commented

2020-09-18 10:03:33 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2020-09-18 10:03:33 +02:00

Campbell Barton self-assigned this 2020-09-18 10:03:33 +02:00

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2.8: Python API: window's workspace can't be set in Application timer #71383