ui_panels.py

            user_preferences = bpy.context.preferences.addons['blenderkit'].preferences

            message = "BlenderKit connects from Blender to an online, " \
                      "community built shared library of models, " \
                      "materials, and brushes. " \
                      "Use addon preferences to set up where files will be saved in the Global directory setting."

            utils.label_multiline(layout, text=message, width=300)
            utils.label_multiline(layout, text="\n Let's start by searching for some cool materials?", width=300)
        else:
            message = "Operator Tutorial called with invalid step"

    def execute(self, context):
        if self.step == 0:
            # move mouse:
            # bpy.context.window_manager.windows[0].cursor_warp(1000, 1000)
            # show n-key sidebar (spaces[index] has to be found for view3d too:
            # bpy.context.window_manager.windows[0].screen.areas[5].spaces[0].show_region_ui = False
            print('running search no')
            ui_props = bpy.context.scene.blenderkitUI
            ui_props.asset_type = 'MATERIAL'
            bpy.context.scene.blenderkit_mat.search_keywords = 'ice'
            # search.search()
        return {'FINISHED'}

    def invoke(self, context, event):
        wm = bpy.context.window_manager
        return wm.invoke_props_dialog(self)


def draw_asset_context_menu(self, context, asset_data):
    layout = self.layout
    ui_props = context.scene.blenderkitUI

    author_id = str(asset_data['author']['id'])
    wm = bpy.context.window_manager
    if wm.get('bkit authors') is not None:
        a = bpy.context.window_manager['bkit authors'].get(author_id)
        if a is not None:
            # utils.p('author:', a)
            op = layout.operator('wm.url_open', text="Open Author's Website")
            if a.get('aboutMeUrl') is not None:
                op.url = a['aboutMeUrl']
            else:
                op.url = paths.get_author_gallery_url(a['id'])
            op = layout.operator('view3d.blenderkit_search', text="Show Assets By Author")
            op.keywords = ''
            op.author_id = author_id

    op = layout.operator('view3d.blenderkit_search', text='Search Similar')
    #build search string from description and tags:
    op.keywords = asset_data['name']
    if asset_data.get('description'):
        op.keywords += ' ' + asset_data.get('description')
    op.keywords += ' '.join(asset_data.get('tags'))

    if asset_data.get('canDownload') != 0:
        if len(bpy.context.selected_objects) > 0 and ui_props.asset_type == 'MODEL':
            aob = bpy.context.active_object
            if aob is None:
                aob = bpy.context.selected_objects[0]
            op = layout.operator('scene.blenderkit_download', text='Replace Active Models')

            # this checks if the menu got called from right-click in assetbar(then index is 0 - x) or
            # from a panel(then replacement happens from the active model)
            if ui_props.active_index == -3:
                # called from addon panel
                o = utils.get_active_model()
                op.asset_base_id = o['asset_data']['assetBaseId']
            else:
                op.asset_index = ui_props.active_index

            op.asset_type = ui_props.asset_type
            op.model_location = aob.location
            op.model_rotation = aob.rotation_euler
            op.target_object = aob.name
            op.material_target_slot = aob.active_material_index
            op.replace = True

    wm = bpy.context.window_manager
    profile = wm.get('bkit profile')
    if profile is not None:
        # validation
        if utils.profile_is_validator():
            layout.label(text='Validation tools:')
            if asset_data['verificationStatus'] != 'uploaded':
                op = layout.operator('object.blenderkit_change_status', text='set Uploaded')
                op.asset_id = asset_data['id']
                op.state = 'uploaded'
            if asset_data['verificationStatus'] != 'validated':
                op = layout.operator('object.blenderkit_change_status', text='Validate')
                op.asset_id = asset_data['id']
                op.state = 'validated'
            if asset_data['verificationStatus'] != 'on_hold':
                op = layout.operator('object.blenderkit_change_status', text='Put on Hold')
                op.asset_id = asset_data['id']
                op.state = 'on_hold'
            if asset_data['verificationStatus'] != 'rejected':
                op = layout.operator('object.blenderkit_change_status', text='Reject')
                op.asset_id = asset_data['id']
                op.state = 'rejected'



        if author_id == str(profile['user']['id']):
            layout.label(text='Management tools:')
            row = layout.row()
            row.operator_context = 'INVOKE_DEFAULT'
            op = row.operator('object.blenderkit_change_status', text='Delete')
            op.asset_id = asset_data['id']
            op.state = 'deleted'

        if utils.profile_is_validator():
            layout.label(text='Admin rating Tools:')

            op = layout.operator('wm.blenderkit_menu_rating_upload', text='Fast rate')
            op.asset_id = asset_data['id']
            op.asset_type = asset_data['assetType']


class OBJECT_MT_blenderkit_asset_menu(bpy.types.Menu):
    bl_label = "Asset options:"
    bl_idname = "OBJECT_MT_blenderkit_asset_menu"

    def draw(self, context):
        ui_props = context.scene.blenderkitUI

        # sr = bpy.context.scene['search results']
        sr = bpy.context.scene['search results']
        asset_data = sr[ui_props.active_index]
        draw_asset_context_menu(self, context, asset_data)


class OBJECT_MT_blenderkit_login_menu(bpy.types.Menu):
    bl_label = "BlenderKit login/signup:"
    bl_idname = "OBJECT_MT_blenderkit_login_menu"

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

        # utils.label_multiline(layout, text=message)
        draw_login_buttons(layout)


class SetCategoryOperator(bpy.types.Operator):
    """Visit subcategory"""
    bl_idname = "view3d.blenderkit_set_category"
    bl_label = "BlenderKit Set Active Category"
    bl_options = {'REGISTER', 'UNDO', 'INTERNAL'}

    category: bpy.props.StringProperty(
        name="Category",
        description="set this category active",
        default="")

    asset_type: bpy.props.StringProperty(
        name="Asset Type",
        description="asset type",
        default="")

    @classmethod
    def poll(cls, context):
        return True

    def execute(self, context):
        acat = bpy.context.window_manager['active_category'][self.asset_type]
        if self.category == '':
            acat.remove(acat[-1])
        else:
            acat.append(self.category)
        # we have to write back to wm. Thought this should happen with original list.
        bpy.context.window_manager['active_category'][self.asset_type] = acat
        return {'FINISHED'}


class UrlPopupDialog(bpy.types.Operator):
    """Generate Cycles thumbnail for model assets"""
    bl_idname = "wm.blenderkit_url_dialog"
    bl_label = "BlenderKit message:"
    bl_options = {'REGISTER', 'INTERNAL'}

    url: bpy.props.StringProperty(
        name="Url",
        description="url",
        default="")

    link_text: bpy.props.StringProperty(
        name="Url",
        description="url",
        default="Go to website")

    message: bpy.props.StringProperty(
        name="Text",
        description="text",
        default="")

    # @classmethod
    # def poll(cls, context):
    #     return bpy.context.view_layer.objects.active is not None

    def draw(self, context):
        layout = self.layout
        utils.label_multiline(layout, text=self.message)

        layout.active_default = True
        op = layout.operator("wm.url_open", text=self.link_text, icon='QUESTION')
        op.url = self.url

    def execute(self, context):
        # start_thumbnailer(self, context)
        return {'FINISHED'}

    def invoke(self, context, event):
        wm = context.window_manager

        return wm.invoke_props_dialog(self)


class LoginPopupDialog(bpy.types.Operator):
    """Generate Cycles thumbnail for model assets"""
    bl_idname = "wm.blenderkit_url_dialog"
    bl_label = "BlenderKit login"
    bl_options = {'REGISTER', 'INTERNAL'}

    message: bpy.props.StringProperty(
        name="Message",
        description="",
        default="Your were logged out from BlenderKit. Please login again. ")

    # @classmethod
    # def poll(cls, context):
    #     return bpy.context.view_layer.objects.active is not None

    def draw(self, context):
        layout = self.layout
        utils.label_multiline(layout, text=self.message)

        layout.active_default = True
        op = layout.operator
        op = layout.operator("wm.url_open", text=self.link_text, icon='QUESTION')
        op.url = self.url

    def execute(self, context):
        # start_thumbnailer(self, context)
        return {'FINISHED'}

    def invoke(self, context, event):
        wm = context.window_manager

        return wm.invoke_props_dialog(self)


def draw_panel_categories(self, context):
    s = context.scene
    ui_props = s.blenderkitUI
    user_preferences = bpy.context.preferences.addons['blenderkit'].preferences
    layout = self.layout
    # row = layout.row()
    # row.prop(ui_props, 'asset_type', expand=True, icon_only=True)
    layout.separator()

    layout.label(text='Categories')
    wm = bpy.context.window_manager
    if wm.get('bkit_categories') == None:
        return
    col = layout.column(align=True)
    if wm.get('active_category') is not None:
        acat = wm['active_category'][ui_props.asset_type]
        if len(acat) > 1:
            # we are in subcategory, so draw the parent button
            op = col.operator('view3d.blenderkit_set_category', text='...', icon='FILE_PARENT')
            op.asset_type = ui_props.asset_type
            op.category = ''
    cats = categories.get_category(wm['bkit_categories'], cat_path=acat)
    # draw freebies only in models parent category
    # if ui_props.asset_type == 'MODEL' and len(acat) == 1:
    #     op = col.operator('view3d.blenderkit_asset_bar', text='freebies')
    #     op.free_only = True

    for c in cats['children']:
        if c['assetCount'] > 0:
            row = col.row(align=True)
            if len(c['children']) > 0 and c['assetCount'] > 15:
                row = row.split(factor=.8, align=True)
            # row = split.split()
            ctext = '%s (%i)' % (c['name'], c['assetCount'])
            op = row.operator('view3d.blenderkit_asset_bar', text=ctext)
            op.do_search = True
            op.keep_running = True
            op.category = c['slug']
            # TODO enable subcategories, now not working due to some bug on server probably
            if len(c['children']) > 0 and c['assetCount'] > 15:
                # row = row.split()
                op = row.operator('view3d.blenderkit_set_category', text='>>')
                op.asset_type = ui_props.asset_type
                op.category = c['slug']
                # for c1 in c['children']:
                #     if c1['assetCount']>0:
                #         row = col.row()
                #         split = row.split(percentage=.2)
                #         row = split.split()
                #         row = split.split()
                #         ctext = '%s (%i)' % (c1['name'], c1['assetCount'])
                #         op = row.operator('view3d.blenderkit_search', text=ctext)
                #         op.category = c1['slug']


class VIEW3D_PT_blenderkit_downloads(Panel):
    bl_category = "BlenderKit"
    bl_idname = "VIEW3D_PT_blenderkit_downloads"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_label = "Downloads"

    @classmethod
    def poll(cls, context):
        return len(download.download_threads) > 0

    def draw(self, context):
        layout = self.layout
        for threaddata in download.download_threads:
            tcom = threaddata[2]
            asset_data = threaddata[1]
            row = layout.row()
            row.label(text=asset_data['name'])
            row.label(text=str(int(tcom.progress)) + ' %')
            row.operator('scene.blenderkit_download_kill', text='', icon='CANCEL')
            if tcom.passargs.get('retry_counter', 0) > 0:
                row = layout.row()
                row.label(text='failed. retrying ... ', icon='ERROR')
                row.label(text=str(tcom.passargs["retry_counter"]))

                layout.separator()


def header_search_draw(self, context):
    '''Top bar menu in 3D view'''

    if not utils.guard_from_crash():
        return;

    preferences = bpy.context.preferences.addons['blenderkit'].preferences
    if preferences.search_in_header:
        layout = self.layout
        s = bpy.context.scene
        ui_props = s.blenderkitUI
        if ui_props.asset_type == 'MODEL':
            props = s.blenderkit_models
        if ui_props.asset_type == 'MATERIAL':
            props = s.blenderkit_mat
        if ui_props.asset_type == 'BRUSH':
            props = s.blenderkit_brush

        # the center snap menu is in edit and object mode if tool settings are off.
        if context.space_data.show_region_tool_header == True or context.mode[:4] not in ('EDIT', 'OBJE'):
            layout.separator_spacer()
        layout.prop(ui_props, "asset_type", text='', icon='URL')
        layout.prop(props, "search_keywords", text="", icon='VIEWZOOM')
        draw_assetbar_show_hide(layout, props)


# We can store multiple preview collections here,
# however in this example we only store "main"
preview_collections = {}

classess = (
    SetCategoryOperator,
    VIEW3D_PT_blenderkit_profile,
    VIEW3D_PT_blenderkit_login,
    VIEW3D_PT_blenderkit_unified,
    VIEW3D_PT_blenderkit_advanced_model_search,
    VIEW3D_PT_blenderkit_advanced_material_search,
    VIEW3D_PT_blenderkit_categories,
    VIEW3D_PT_blenderkit_import_settings,
    VIEW3D_PT_blenderkit_model_properties,
    # VIEW3D_PT_blenderkit_ratings,
    VIEW3D_PT_blenderkit_downloads,
    OBJECT_MT_blenderkit_asset_menu,
    OBJECT_MT_blenderkit_login_menu,
    UrlPopupDialog,
    BlenderKitWelcomeOperator,
)


def register_ui_panels():
    for c in classess:
        bpy.utils.register_class(c)
    bpy.types.VIEW3D_MT_editor_menus.append(header_search_draw)


def unregister_ui_panels():
    bpy.types.VIEW3D_MT_editor_menus.remove(header_search_draw)
    for c in classess:
        print('unregister', c)
        bpy.utils.unregister_class(c)