how do we hide show a collection in blender 2.8
let say that this is the path to my collection
bpy.data.collections['SCATTER: [Plane.001] Particles']
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The operator that toggles the collection visibility in the outliner is bpy.ops.outliner.item_openclose(). Unfortunately it depends on the cursor position to determine the collection that should be toggled. While we could position the cursor with bpy.context.window.cursor_warp() the x and y coordinates of the collection in the UI remain unknown. It's therefore not realistically possible to perform this operation in a script or add-on.
I could get it to work with manually determined coordinates to position the cursor on the arrow icon in front of the collection.
import bpy
context = bpy.context.copy()
for area in bpy.context.screen.areas:
if area.type == 'OUTLINER':
for region in area.regions:
if region.type == 'WINDOW':
context['area'] = area
context['region'] = region
break
break
# Places the cursor directly on the arrow icon for the first collection with
# my screen resolution and UI layout.
bpy.context.window.cursor_warp(2150,1250)
bpy.ops.outliner.item_openclose(context, 'INVOKE_DEFAULT')
answered Nov 7 '19 at 15:19
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$\begingroup$ Thanks for the response, the problem is that this script wouldn't work if the user doesn't have an outliner open in his window. $\endgroup$– DB3DNov 7 '19 at 15:33
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1$\begingroup$ It doesn't work in general, since you don't know the x,y coordinates since the UI layout and screen resolution are likely different. Perhaps there is a different way to approach this problem. Why do you want to toggle the collection in the outliner? $\endgroup$– Robert Gützkow ♦Nov 7 '19 at 15:37
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$\begingroup$ because i'm creating collections and some users are annoyed to close them manually each time, which i understand. $\endgroup$– DB3DNov 7 '19 at 15:40
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1$\begingroup$ There are some options, however they aren't very selective and also require a custom context.
bpy.ops.outliner.show_one_level()for expanding or collapsing one level orbpy.ops.outliner.expanded_toggle()to expand or collapse all elements. $\endgroup$– Robert Gützkow ♦Nov 7 '19 at 15:54
bpy.ops.outliner.item_openclose(). Besides a custom context it also requires the cursor to be placed at the element that is toggled. I don't think this is practically possible for an add-on to do both because shifting the cursor withbpy.context.window.cursor_warp()would be very irritating to the user, but more importantly the x,y position of the collection in the outliner is unknown. $\endgroup$