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I used UILayout.column_flow(...) and UILayout.operator(...) to arrange buttons horizontally in a panel.

enter image description here

These buttons need to be enabled and disabled independently depending on the context. Currently, buttons with icons are differentiated by displaying CHECKBOX_DEHLT when disabled, and text buttons are on separate lines. But they're not cool. Is there any trick? I would like to avoid creating my own icons or embossing.
I've prepared a template for you to answer.

import bpy

class LayoutDemoPanel(bpy.types.Panel):
    """Creates a Panel in the scene context of the properties editor"""
    bl_label = "Layout Demo"
    bl_idname = "SCENE_PT_layout"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = "Test"


    def draw(self, context):

        layout = self.layout
        
        #---------------------------------------
        # Here is  question
        col = layout.column_flow(columns=2)
        col.enabled = False
        col.operator("view3d.test_operator1", text="Ico Sphere")
        col.enabled = True
        col.operator("view3d.test_operator2", text="Monkey")
        #---------------------------------------


class VIEW3D_OT_test_operator1(bpy.types.Operator):
    bl_idname = "view3d.test_operator1"
    bl_label = "Operator1"

    def execute(self, context):
        bpy.ops.mesh.primitive_ico_sphere_add()
        return {'FINISHED'}

class VIEW3D_OT_test_operator2(bpy.types.Operator):
    bl_idname = "view3d.test_operator2"
    bl_label = "Operator2"

    def execute(self, context):
        bpy.ops.mesh.primitive_monkey_add()
        return {'FINISHED'}

classes = (
    LayoutDemoPanel, 
    VIEW3D_OT_test_operator1, 
    VIEW3D_OT_test_operator2, 
        )

def register():
    for cls in classes:
        bpy.utils.register_class(cls)


def unregister():
    for cls in classes:
        bpy.utils.unregister_class(cls)


if __name__ == "__main__":
    register()
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1 Answer 1

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you can change the enabled/disabled state of each button by using the poll method in the operator:

e.g.:

@classmethod
  def poll(cls, context):
      return context.active_object is not None

yes, this is dependent on context - but of course you could e.g. use any global variable to enable/disable it. e.g. return show_button1 == True

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  • $\begingroup$ Using the poll(...) method has a side effect. If the mouse remains over the button after clicking it, the button will not return to its enabled state even if poll(...) return True. I might give it some more thought and then make a new question. Thanks $\endgroup$ Commented Jul 31 at 11:27

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