[fix] fix add floor alignment and add some new icons.

- try setting center alignment for add floor popup operator. it is not center alignment now because blender's impl but it is better than previous layout.
- add some components icon for more directly visual.

ballance_blender_plugin/UTILS_icons_manager.py

@@ -12,23 +12,42 @@ floor_icons = None
 # a map. key is block name, value is loaded icon id
 floor_icons_map: dict = {}
 
+element_icons = None
+element_icons_map: dict = {}
+
 def register_icons():
     global floor_icons, floor_icons_map
+    global element_icons, element_icons_map
 
     icon_path = os.path.join(os.path.dirname(__file__), "icons")
+
     floor_icons = bpy.utils.previews.new()
     for key, value in UTILS_constants.floor_blockDict.items():
-        blockIconName = "Ballance_FloorIcon_" + key
+        blockIconName = "BlcBldPlg_FloorIcon_" + key
         floor_icons.load(blockIconName, os.path.join(icon_path, "floor", value["BindingDisplayTexture"]), 'IMAGE')
         floor_icons_map[key] = floor_icons[blockIconName].icon_id
 
+    element_icons = bpy.utils.previews.new()
+    for elename in UTILS_constants.bmfile_componentList:
+        blockIconName = "BlcBldPlg_ElementIcon_" + elename
+        element_icons.load(blockIconName, os.path.join(icon_path, "element", elename + '.png'), 'IMAGE')
+        element_icons_map[elename] = element_icons[blockIconName].icon_id
+
 def unregister_icons():
     global floor_icons, floor_icons_map
+    global element_icons, element_icons_map
 
     bpy.utils.previews.remove(floor_icons)
     floor_icons_map.clear()
+    bpy.utils.previews.remove(element_icons)
+    element_icons_map.clear()
 
 def get_floor_icon(floor_blk_name: str):
     global floor_icons_map
+    # default return 0
+    return floor_icons_map.get(floor_blk_name, 0)
 
-    return floor_icons_map[floor_blk_name]
+def get_element_icon(element_name: str):
+    global element_icons_map
+    # default return 0
+    return element_icons_map.get(element_name, 0)