virtualPainter/ui.py

import bpy

class vPainterSetting(bpy.types.PropertyGroup):
    is_vPainter_enabled: bpy.props.BoolProperty(
        name="Addon Enabled",
        description="Enable / disable the virtual Painter",
        default=False,
        update=lambda self, context: toggle_operator(context)
    )
    texture_panel_state: bpy.props.BoolProperty(
        name="Textures",
        default=False,
        description="Textures used for painting"
    )

def toggle_operator(context):
    """Start or stop the modal operator based on the checkbox."""
    if context.scene.vPainter_settings.is_vPainter_enabled:
        # Start the operator
        bpy.ops.paint.virtual_painter('INVOKE_DEFAULT')
        
class textureSelection(bpy.types.PropertyGroup):
    texture: bpy.props.PointerProperty(
        name="Texture",
        type=bpy.types.Image,
        description="Select a texture",
    )
    color: bpy.props.FloatVectorProperty(
        name="Color",
        subtype='COLOR',
        size=4,
        min=0.0,
        max=1.0,
        default=(1.0, 1.0, 1.0, 1.0),
        description="Select a color (RGBA)",
    )
    
class VIEW3D_PT_ToolActiveToolPanel(bpy.types.Panel):
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = "Tool"
    bl_label = "Virtual Painter"
    bl_idname = "VIEW3D_PT_virtual_Painter"

    def draw(self, context):
        layout = self.layout
        tool_settings = context.scene.vPainter_settings
        normal_texture = context.scene.normal_texture_settings
        texture_collection = context.scene.texture_collection_settings

        # Add the checkbox to toggle the operator
        layout.prop(
            tool_settings,
            "is_vPainter_enabled",
            text="DISABLE" if tool_settings.is_vPainter_enabled else "ENABLE",
            toggle=True,
            invert_checkbox=True
        )        
        
        # Collapsible section of used textures
        layout.prop(
            tool_settings,
            "texture_panel_state",
            emboss=False,
            icon="DOWNARROW_HLT" if tool_settings.texture_panel_state else "RIGHTARROW",
            toggle=True
        )
        if tool_settings.texture_panel_state:
            section = layout.box()
            section.label(text="Normal Texture")
            
            # Normal texture selection
            section.prop(normal_texture, "texture", text="", icon="TEXTURE")
            
            section.separator(type='LINE')
            
            # Custom texture selection
            section.label(text="Custom Texture")
            
            # Display all items in the collection
            for index, item in enumerate(texture_collection):
                box = section.box()
                box.prop(item, "texture", text="", icon="TEXTURE")
                box.prop(item, "color", text="", icon="COLOR")
                box.operator("custom_texture.remove_item", text="", icon="X").index = index
            section.operator("custom_texture.add_item", icon="ADD")
                
# Operator to add new items to the collection
class IMAGE_OT_AddItem(bpy.types.Operator):
    bl_idname = "custom_texture.add_item"
    bl_label = "Add New"
    bl_description = "Add a new texture"

    def execute(self, context):
        texture_collection = context.scene.texture_collection_settings
        texture_collection.add()
        return {'FINISHED'}
    
# Operator to remove items from the collection
class IMAGE_OT_RemoveItem(bpy.types.Operator):
    bl_idname = "custom_texture.remove_item"
    bl_label = ""
    bl_description = "Remove this texture"
    
    index: bpy.props.IntProperty()

    def execute(self, context):
        texture_collection = context.scene.texture_collection_settings
        if 0 <= self.index < len(texture_collection):
            texture_collection.remove(self.index)
        return {'FINISHED'}


def register():
    bpy.utils.register_class(vPainterSetting)
    bpy.utils.register_class(textureSelection)
    bpy.utils.register_class(VIEW3D_PT_ToolActiveToolPanel)
    bpy.utils.register_class(IMAGE_OT_AddItem)
    bpy.utils.register_class(IMAGE_OT_RemoveItem)

    bpy.types.Scene.vPainter_settings = bpy.props.PointerProperty(type=vPainterSetting)
    bpy.types.Scene.normal_texture_settings = bpy.props.PointerProperty(type=textureSelection)
    bpy.types.Scene.texture_collection_settings = bpy.props.CollectionProperty(type=textureSelection)

def unregister():
    bpy.utils.unregister_class(vPainterSetting)
    bpy.utils.unregister_class(textureSelection)
    bpy.utils.unregister_class(VIEW3D_PT_ToolActiveToolPanel)
    bpy.utils.unregister_class(IMAGE_OT_AddItem)
    bpy.utils.unregister_class(IMAGE_OT_RemoveItem)

    del bpy.types.Scene.vPainter_settings
    del bpy.types.Scene.normal_texture_settings
    del bpy.types.Scene.texture_collection_settings