Step property in IntProperty not working.

Coding Python Support
1

I’m trying to make a button in the property shelf which allows a user to input a number or click on the left and right arrows to increase or decrease its value. I thought you could change this default (arrows increasing or decreasing) value using the step option but it’s not working. For instance, when clicking on the right arrow of the value, I would like it to increase by 256, but it keeps only incrementing or decrementing by 1. Here’s the code. Any ideas?:


import bpy


#Define properties and store them into a PropertyGroup 
#class for easy registration at the bottom.
class propertySettings(bpy.types.PropertyGroup):
    bpy.types.WindowManager.imgSize = bpy.props.IntProperty(
    name="New Layer Size",
    description = "The size of the next layer you add (width and height) will be this",
    default = 1024, 
    min = 24,
    step = 256)


#Draw the addon into the Property Shelf    
class myPaint(bpy.types.Panel):
    bl_label = "Layers"
    bl_space_type = "VIEW_3D"
    bl_region_type = "UI"
    
    #Make addon specific to Texture Paint mode
    @classmethod
    def poll(cls, context):
        return (context.image_paint_object)
    
    def draw(self, context):
        
        layout = self.layout
        
        row = layout.row()
        row.prop(context.window_manager, "imgSize")



#Registration
classes = [propertySettings, myPaint]


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


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


if __name__ == "__main__":
    register()
2

IntProperty does not support it, it seems. But you can use a trick:


bpy.types.WindowManager.imgSize = bpy.props.FloatProperty(
    name="New Layer Size",
    description="The size of the next layer you add (width and height) will be this",
    default=1024, 
    min=24,
    precision=0,
    step=25600
)

FloatProperty supports step, and we can set the precision to 0 to hide the decimal places. Make sure you round it to int if necessary, as it’s still a float internally and may not work otherwise under certain circumstances (e.g. range doesn’t support floats).

The step value is given in 100th btw!

3

Cool! Works great. Thanks.

4

Just to wrap this up for anyone who might come across this, to basically treat a FloatProperty() like an IntProperty(), follow the tips presented by CoDEmanX and then wherever you’re using the property later in your script just inclose it in a round(). So in this case, whenever I needed to access the value provided by the user for this button I use:

myValue = round(bpy.context.window_manager.imgSize)