import bpy
from bpy.types import Panel
from bpy.app.translations import pgettext_iface as iface_


class ModifierButtonsPanel():
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "modifier"
    bl_options = {'HIDE_HEADER'}


class DATA_PT_modifiers(ModifierButtonsPanel, Panel):
    bl_label = "Modifiers"

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

        ob = context.object

        layout.operator_menu_enum("object.modifier_add", "type")

        for md in ob.modifiers:
            box = layout.template_modifier(md)
            if box:
                # match enum type to our functions, avoids a lookup table.
                getattr(self, md.type)(box, ob, md)

    # the mt.type enum is (ab)used for a lookup on function names
    # ...to avoid lengthy if statements
    # so each type must have a function here.

    def ARMATURE(self, layout, ob, md):
        split = layout.split()

        col = split.column()
        col.label(text="Object:")
        col.prop(md, "object", text="")
        col.prop(md, "use_deform_preserve_volume")

        col = split.column()
        col.label(text="Bind To:")
        col.prop(md, "use_vertex_groups", text="Vertex Groups")
        col.prop(md, "use_bone_envelopes", text="Bone Envelopes")

        layout.separator()

        split = layout.split()

        row = split.row(align=True)
        row.prop_search(md, "vertex_group", ob, "vertex_groups", text="")
        sub = row.row(align=True)
        sub.active = bool(md.vertex_group)
        sub.prop(md, "invert_vertex_group", text="", icon='ARROW_LEFTRIGHT')

        split.prop(md, "use_multi_modifier")