blender 2.56 UI scripting

Coding Python Support
1

this (code snippets) used to be my go-to-reference for buttons and other gui things, now it seems to just do nothing…

#----------------------------------------------------------
# File layout.py
#----------------------------------------------------------
import bpy

class LayoutPanel(bpy.types.Panel):
    bl_label = "Panel with funny layout"
    bl_space_type = "VIEW_3D"
    bl_region_type = "TOOL_PROPS"

    def draw(self, context):
        layout = self.layout

        layout.label("First row")
        row = layout.row(align=True)
        row.alignment = 'EXPAND'
        row.operator("object.Button", text="1")
        row.operator("object.Button", text="2", icon='MESH_DATA')
        row.operator("object.Button", icon='LAMP_DATA')

        row = layout.row(align=False)
        row.alignment = 'LEFT'
        row.operator("object.Button", text="4")
        row.operator("object.Button", text="", icon='MATERIAL')
        row.operator("object.Button", text="6", icon='BLENDER')
        row.operator("object.Button", text="7", icon='WORLD')

        layout.label("Third row", icon='TEXT')
        row = layout.row()
        row.alignment = 'RIGHT'
        row.operator("object.Button", text="8")
        row.operator("object.Button", text="9", icon='SCENE')
        row.operator("object.Button", text="10", icon='BRUSH_INFLATE')
        
        layout.label("Fourth row", icon='ACTION')
        row = layout.row()
        box = row.box()
        box.operator("object.Button", text="11", emboss=False)
        box.operator("object.Button", text="12", emboss=False)
        col = row.column()
        subrow = col.row()
        subrow.operator("object.Button", text="13")
        subrow.operator("object.Button", text="14")
        subrow = col.row(align=True)
        subrow.operator("object.Button", text="15")
        subrow.operator("object.Button", text="16")
        box = row.box()
        box.operator("object.Button", text="17")
        box.separator()
        box.operator("object.Button", text="18")
        box.operator("object.Button", text="19")
        
        layout.label("Fifth row")
        row = layout.row()
        split = row.split(percentage=0.25)
        col = split.column()
        col.operator("object.Button", text="21")
        col.operator("object.Button", text="22")
        split = split.split(percentage=0.3)
        col = split.column()
        col.operator("object.Button", text="23")
        split = split.split(percentage=0.5)
        col = split.column()
        col.operator("object.Button", text="24")
        col.operator("object.Button", text="25")
        

class OBJECT_OT_Button(bpy.types.Operator):
    bl_idname = "OBJECT_OT_Button"
    bl_label = "Button"

    def execute(self, context):
        print("Hello world!")
        return{'FINISHED'}

used to display a variety of buttons and layout details, now it just goes silent.
what’s the deal, the current way of doing it is not as obvious as it used to be.

2

You need to register both classes:

<b>bpy.utils.register_class</b>(cls)
Register a subclass of a blender type in (Panel, Menu, Header, Operator, KeyingSetInfo, RenderEngine).
<i>ValueError</i> exception is raised if the class is not a subclass of a registerable blender class.
3

i was running from the text editor (that’s what the register button is for?), but even when i add :

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


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


if __name__ == "__main__":
    register()

full code : http://www.pasteall.org/19668/python

there’s not a whole lot of movement. infact, that evaporates my blender session. ( r35301)
so maybe it’s unstable?

4

You should register OBJECT_OT_Button and LayoutPanel so:

bpy.utils.register_class(OBJECT_OT_Button)
bpy.utils.register_class(LayoutPanel)

You also need to rename operator bl_idname to smth like “object.button” (with dot-chat and no Capital chars).

5

thanks!

#----------------------------------------------------------
# File layout.py
#----------------------------------------------------------
import bpy

class LayoutPanel(bpy.types.Panel):
    bl_label = "Panel with funny layout"
    bl_space_type = "VIEW_3D"
    bl_region_type = "TOOL_PROPS"

    def draw(self, context):
        layout = self.layout

        layout.label("First row")
        row = layout.row(align=True)
        row.alignment = 'EXPAND'
        row.operator("object.Button", text="1")
        row.operator("object.Button", text="2", icon='MESH_DATA')
        row.operator("object.Button", icon='LAMP_DATA')

        row = layout.row(align=False)
        row.alignment = 'LEFT'
        row.operator("object.Button", text="4")
        row.operator("object.Button", text="", icon='MATERIAL')
        row.operator("object.Button", text="6", icon='BLENDER')
        row.operator("object.Button", text="7", icon='WORLD')

        layout.label("Third row", icon='TEXT')
        row = layout.row()
        row.alignment = 'RIGHT'
        row.operator("object.Button", text="8")
        row.operator("object.Button", text="9", icon='SCENE')
        row.operator("object.Button", text="10", icon='BRUSH_INFLATE')
        
        layout.label("Fourth row", icon='ACTION')
        row = layout.row()
        box = row.box()
        box.operator("object.Button", text="11", emboss=False)
        box.operator("object.Button", text="12", emboss=False)
        col = row.column()
        subrow = col.row()
        subrow.operator("object.Button", text="13")
        subrow.operator("object.Button", text="14")
        subrow = col.row(align=True)
        subrow.operator("object.Button", text="15")
        subrow.operator("object.Button", text="16")
        box = row.box()
        box.operator("object.Button", text="17")
        box.separator()
        box.operator("object.Button", text="18")
        box.operator("object.Button", text="19")
        
        layout.label("Fifth row")
        row = layout.row()
        split = row.split(percentage=0.25)
        col = split.column()
        col.operator("object.Button", text="21")
        col.operator("object.Button", text="22")
        split = split.split(percentage=0.3)
        col = split.column()
        col.operator("object.Button", text="23")
        split = split.split(percentage=0.5)
        col = split.column()
        col.operator("object.Button", text="24")
        col.operator("object.Button", text="25")
        

class OBJECT_OT_Button(bpy.types.Operator):
    bl_idname = "object.button"
    bl_label = "Button"

    def execute(self, context):
        print("Hello world!")
        return{'FINISHED'}    

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


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

this runs nicely now, from texteditor at least

6

the above script does not work in r35301

I find it a little crazy that we have to register all classes by name now i thought a name would catch all of them?

at present only this works


#----------------------------------------------------------
# File layout.py
#----------------------------------------------------------
import bpy

class LayoutPanel(bpy.types.Panel):
    bl_label = "Panel with funny layout"
    bl_space_type = "VIEW_3D"
    bl_region_type = "TOOL_PROPS"

    def draw(self, context):
        layout = self.layout

        layout.label("First row")
        row = layout.row(align=True)
        row.alignment = 'EXPAND'
        row.operator("object.button", text="1")
        row.operator("object.button", text="2", icon='MESH_DATA')
        row.operator("object.button", icon='LAMP_DATA')

        row = layout.row(align=False)
        row.alignment = 'LEFT'
        row.operator("object.button", text="4")
        row.operator("object.button", text="", icon='MATERIAL')
        row.operator("object.button", text="6", icon='BLENDER')
        row.operator("object.button", text="7", icon='WORLD')

        layout.label("Third row", icon='TEXT')
        row = layout.row()
        row.alignment = 'RIGHT'
        row.operator("object.button", text="8")
        row.operator("object.button", text="9", icon='SCENE')
        row.operator("object.button", text="10", icon='BRUSH_INFLATE')
        
        layout.label("Fourth row", icon='ACTION')
        row = layout.row()
        box = row.box()
        box.operator("object.button", text="11", emboss=False)
        box.operator("object.button", text="12", emboss=False)
        col = row.column()
        subrow = col.row()
        subrow.operator("object.button", text="13")
        subrow.operator("object.button", text="14")
        subrow = col.row(align=True)
        subrow.operator("object.button", text="15")
        subrow.operator("object.button", text="16")
        box = row.box()
        box.operator("object.button", text="17")
        box.separator()
        box.operator("object.button", text="18")
        box.operator("object.button", text="19")
        
        layout.label("Fifth row")
        row = layout.row()
        split = row.split(percentage=0.25)
        col = split.column()
        col.operator("object.button", text="21")
        col.operator("object.button", text="22")
        split = split.split(percentage=0.3)
        col = split.column()
        col.operator("object.button", text="23")
        split = split.split(percentage=0.5)
        col = split.column()
        col.operator("object.button", text="24")
        col.operator("object.button", text="25")
        

class OBJECT_OT_Button(bpy.types.Operator):
    bl_idname = "object.button"
    bl_label = "Button"

    def execute(self, context):
        print("Hello world!")
        return{'FINISHED'}    

def register():
    bpy.utils.register_class(OBJECT_OT_Button)
    bpy.utils.register_class(LayoutPanel)

def unregister():
    bpy.utils.unregister_class(OBJECT_OT_Button)
    bpy.utils.unregister_class(LayoutPanel)

if __name__ == "__main__":
    register()


7

This works by me (Vista W32 SVN35382)
And adding a mode parameter to the operator, to be able to do different things :yes:


#http://blenderartists.org/forum/showthread.php?t=210513&p=1799525&viewfull=1#post1799525
#----------------------------------------------------------
# File layout.py
#----------------------------------------------------------
import bpy
from bpy.props import IntProperty

class LayoutPanel(bpy.types.Panel):
    bl_label = "Panel with funny layout"
    bl_space_type = "VIEW_3D"
    bl_region_type = "TOOL_PROPS"
    
    def draw(self, context):
        layout = self.layout

        layout.label("First row")
        row = layout.row(align=True)
        row.alignment = 'EXPAND'
        row.operator("object.button", text="1").mode = 1
        row.operator("object.button", text="2", icon='MESH_DATA').mode = 2
        row.operator("object.button", icon='LAMP_DATA')

        row = layout.row(align=False)
        row.alignment = 'LEFT'
        row.operator("object.button", text="4").mode = 4
        row.operator("object.button", text="", icon='MATERIAL').mode =5
        row.operator("object.button", text="6", icon='BLENDER').mode=6
        row.operator("object.button", text="7", icon='WORLD').mode=7

        layout.label("Third row", icon='TEXT')
        row = layout.row()
        row.alignment = 'RIGHT'
        row.operator("object.button", text="8").mode=8
        row.operator("object.button", text="9", icon='SCENE').mode=9
        row.operator("object.button", text="10", icon='BRUSH_INFLATE').mode=10
        #etc for the other object.buttons calls mode = ....
        layout.label("Fourth row", icon='ACTION')
        row = layout.row()
        box = row.box()
        box.operator("object.button", text="11", emboss=False)
        box.operator("object.button", text="12", emboss=False)
        col = row.column()
        subrow = col.row()
        subrow.operator("object.button", text="13")
        subrow.operator("object.button", text="14")
        subrow = col.row(align=True)
        subrow.operator("object.button", text="15")
        subrow.operator("object.button", text="16")
        box = row.box()
        box.operator("object.button", text="17")
        box.separator()
        box.operator("object.button", text="18")
        box.operator("object.button", text="19")
        
        layout.label("Fifth row")
        row = layout.row()
        split = row.split(percentage=0.25)
        col = split.column()
        col.operator("object.button", text="21")
        col.operator("object.button", text="22")
        split = split.split(percentage=0.3)
        col = split.column()
        col.operator("object.button", text="23")
        split = split.split(percentage=0.5)
        col = split.column()
        col.operator("object.button", text="24")
        col.operator("object.button", text="25")
        

class OBJECT_OT_Button(bpy.types.Operator):
    bl_idname = "object.button"
    bl_label = "Button"
    mode = IntProperty(name="mode",min =-100, max =20,soft_max=10,default =-99) 
    def execute(self, context):
        print("Hello world!")
        print(self.mode)
        return{'FINISHED'}    

def register():
    bpy.utils.register_module(__name__)
    pass

def unregister():
    bpy.utils.unregister_module(__name__)
    pass

if __name__ == "__main__":
    register()
8

one question here
you addeda propr inside a class which is not the panel class

does it means it can re assign otherwise then using a button
or is it out of context ?

thanks

9

A rather old thread, but this is an interesting example of UI Panel coding, so it’s worth updating.

The only change I made was: object.Button became object.button (all lowercase naming convention)


#----------------------------------------------------------
# File layout.py
#----------------------------------------------------------
import bpy

class LayoutPanel(bpy.types.Panel):
    bl_label = "Panel with funny layout"
    bl_space_type = "VIEW_3D"
    bl_region_type = "UI"

    def draw(self, context):
        layout = self.layout

        layout.label("First row")
        row = layout.row(align=True)
        row.alignment = 'EXPAND'
        row.operator("object.button", text="1")
        row.operator("object.button", text="2", icon='MESH_DATA')
        row.operator("object.button", icon='LAMP_DATA')

        row = layout.row(align=False)
        row.alignment = 'LEFT'
        row.operator("object.button", text="4")
        row.operator("object.button", text="", icon='MATERIAL')
        row.operator("object.button", text="6", icon='BLENDER')
        row.operator("object.button", text="7", icon='WORLD')

        layout.label("Third row", icon='TEXT')
        row = layout.row()
        row.alignment = 'RIGHT'
        row.operator("object.button", text="8")
        row.operator("object.button", text="9", icon='SCENE')
        row.operator("object.button", text="10", icon='BRUSH_INFLATE')
        
        layout.label("Fourth row", icon='ACTION')
        row = layout.row()
        box = row.box()
        box.operator("object.button", text="11", emboss=False)
        box.operator("object.button", text="12", emboss=False)
        col = row.column()
        subrow = col.row()
        subrow.operator("object.button", text="13")
        subrow.operator("object.button", text="14")
        subrow = col.row(align=True)
        subrow.operator("object.button", text="15")
        subrow.operator("object.button", text="16")
        box = row.box()
        box.operator("object.button", text="17")
        box.separator()
        box.operator("object.button", text="18")
        box.operator("object.button", text="19")
        
        layout.label("Fifth row")
        row = layout.row()
        split = row.split(percentage=0.25)
        col = split.column()
        col.operator("object.button", text="21")
        col.operator("object.button", text="22")
        split = split.split(percentage=0.3)
        col = split.column()
        col.operator("object.button", text="23")
        split = split.split(percentage=0.5)
        col = split.column()
        col.operator("object.button", text="24")
        col.operator("object.button", text="25")
        

class OBJECT_OT_Button(bpy.types.Operator):
    bl_idname = "object.button"
    bl_label = "Button"

    def execute(self, context):
        print("Hello world!")
        return{'FINISHED'}    

def register():
    bpy.utils.register_module(__name__)

def unregister():
    bpy.utils.unregister_module(__name__)

if __name__ == "__main__":
    register()