blender/scripts/startup/bl_ui/properties_data_curves.py

# SPDX-FileCopyrightText: 2009-2023 Blender Authors
#
# SPDX-License-Identifier: GPL-2.0-or-later

import bpy
from bpy.types import Menu, Panel, UIList
from rna_prop_ui import PropertyPanel


class DataButtonsPanel:
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "data"

    @classmethod
    def poll(cls, context):
        engine = context.scene.render.engine
        return hasattr(context, "curves") and context.curves and (engine in cls.COMPAT_ENGINES)


class DATA_PT_context_curves(DataButtonsPanel, Panel):
    bl_label = ""
    bl_options = {'HIDE_HEADER'}
    COMPAT_ENGINES = {
        'BLENDER_RENDER',
        'BLENDER_EEVEE',
        'BLENDER_EEVEE_NEXT',
        'BLENDER_WORKBENCH',
    }

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

        ob = context.object
        curves = context.curves
        space = context.space_data

        if ob:
            layout.template_ID(ob, "data")
        elif curves:
            layout.template_ID(space, "pin_id")


class DATA_PT_curves_surface(DataButtonsPanel, Panel):
    bl_label = "Surface"
    COMPAT_ENGINES = {
        'BLENDER_RENDER',
        'BLENDER_EEVEE',
        'BLENDER_EEVEE_NEXT',
        'BLENDER_WORKBENCH',
    }

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

        layout.use_property_split = True

        layout.prop(ob.data, "surface")
        has_surface = ob.data.surface is not None
        if has_surface:
            layout.prop_search(
                ob.data,
                "surface_uv_map",
                ob.data.surface.data,
                "uv_layers",
                text="UV Map",
                icon='GROUP_UVS')
        else:
            row = layout.row()
            row.prop(ob.data, "surface_uv_map", text="UV Map")
            row.active = has_surface


class CURVES_MT_add_attribute(Menu):
    bl_label = "Add Attribute"

    @staticmethod
    def add_standard_attribute(layout, curves, name, data_type, domain):
        exists = curves.attributes.get(name) is not None

        col = layout.column()
        col.enabled = not exists
        col.operator_context = 'EXEC_DEFAULT'

        props = col.operator("geometry.attribute_add", text=name)
        props.name = name
        props.data_type = data_type
        props.domain = domain

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

        self.add_standard_attribute(layout, curves, "radius", 'FLOAT', 'POINT')
        self.add_standard_attribute(layout, curves, "color", 'FLOAT_COLOR', 'POINT')

        layout.separator()

        layout.operator_context = 'INVOKE_DEFAULT'
        layout.operator("geometry.attribute_add", text="Custom...")


class CURVES_UL_attributes(UIList):
    def filter_items(self, _context, data, property):
        attributes = getattr(data, property)
        flags = []
        indices = [i for i in range(len(attributes))]

        # Filtering by name
        if self.filter_name:
            flags = bpy.types.UI_UL_list.filter_items_by_name(
                self.filter_name, self.bitflag_filter_item, attributes, "name", reverse=self.use_filter_invert)
        if not flags:
            flags = [self.bitflag_filter_item] * len(attributes)

        # Filtering internal attributes
        for idx, item in enumerate(attributes):
            flags[idx] = 0 if item.is_internal else flags[idx]

        # Reorder by name.
        if self.use_filter_sort_alpha:
            indices = bpy.types.UI_UL_list.sort_items_by_name(attributes, "name")

        return flags, indices

    def draw_item(self, _context, layout, _data, attribute, _icon, _active_data, _active_propname, _index):
        data_type = attribute.bl_rna.properties["data_type"].enum_items[attribute.data_type]
        domain = attribute.bl_rna.properties["domain"].enum_items[attribute.domain]

        split = layout.split(factor=0.5)
        split.emboss = 'NONE'
        row = split.row()
        row.prop(attribute, "name", text="")
        sub = split.split()
        sub.alignment = 'RIGHT'
        sub.active = False
        sub.label(text=domain.name)
        sub.label(text=data_type.name)


class DATA_PT_CURVES_attributes(DataButtonsPanel, Panel):
    bl_label = "Attributes"
    COMPAT_ENGINES = {
        'BLENDER_RENDER',
        'BLENDER_EEVEE',
        'BLENDER_EEVEE_NEXT',
        'BLENDER_WORKBENCH',
    }

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

        layout = self.layout
        row = layout.row()

        col = row.column()
        col.template_list(
            "CURVES_UL_attributes",
            "attributes",
            curves,
            "attributes",
            curves.attributes,
            "active_index",
            rows=3,
        )

        col = row.column(align=True)
        col.menu("CURVES_MT_add_attribute", icon='ADD', text="")
        col.operator("geometry.attribute_remove", icon='REMOVE', text="")


class DATA_PT_custom_props_curves(DataButtonsPanel, PropertyPanel, Panel):
    COMPAT_ENGINES = {
        'BLENDER_RENDER',
        'BLENDER_EEVEE',
        'BLENDER_EEVEE_NEXT',
        'BLENDER_WORKBENCH',
    }
    _context_path = "object.data"
    _property_type = bpy.types.Curves if hasattr(bpy.types, "Curves") else None


classes = (
    DATA_PT_context_curves,
    DATA_PT_CURVES_attributes,
    DATA_PT_curves_surface,
    DATA_PT_custom_props_curves,
    CURVES_MT_add_attribute,
    CURVES_UL_attributes,
)

if __name__ == "__main__":  # only for live edit.
    from bpy.utils import register_class
    for cls in classes:
        register_class(cls)