"""
Custom Drawing
++++++++++++++
By default operator properties use an automatic user interface layout.
If you need more control you can create your own layout with a
:class:`Operator.draw` function.

This works like the :class:`Panel` and :class:`Menu` draw functions, its used
for dialogs and file selectors.
"""
import bpy


class CustomDrawOperator(bpy.types.Operator):
    bl_idname = "object.custom_draw"
    bl_label = "Simple Modal Operator"

    filepath = bpy.props.StringProperty(subtype="FILE_PATH")

    my_float = bpy.props.FloatProperty(name="Float")
    my_bool = bpy.props.BoolProperty(name="Toggle Option")
    my_string = bpy.props.StringProperty(name="String Value")

    def execute(self, context):
        print("Test", self)
        return {'FINISHED'}

    def invoke(self, context, event):
        context.window_manager.fileselect_add(self)
        return {'RUNNING_MODAL'}

    def draw(self, context):
        layout = self.layout
        col = layout.column()
        col.label(text="Custom Interface!")

        row = col.row()
        row.prop(self, "my_float")
        row.prop(self, "my_bool")

        col.prop(self, "my_string")

bpy.utils.register_class(CustomDrawOperator)

# test call
bpy.ops.object.custom_draw('INVOKE_DEFAULT')