python - Kivy 中的属性错误 : GridLayout object has no attribute _trigger_layout

Question

我正在尝试用 python 编写一个程序，该程序获取图像的一部分并使用 GridLayout 在 kivy 中渲染它们。

使用 XML 文件和我的 map 数据，我从每个图 block 的全局 ID(或“GID”，请参阅 here 了解它的工作原理和我的程序使用的过程的说明)中读取每个图 block ，然后转换源将图像设置为纹理，并使用 .get_region() 方法获取该纹理的区域。然后，我创建一个图像小部件，其中包含要放入 GridLayout 中的纹理部分。但我收到此错误:

Traceback (most recent call last): File "test_parse_xml.py", line 92, in Ground = Layer(root[1].attrib['name'], int(root[1].attrib['width']), int(root[1].attrib['height'])) File "test_parse_xml.py", line 85, in init self.add_widget(Image(current_texture)) #returns an error. What am I doing wrong?
File "/Applications/Kivy.app/Contents/Resources/kivy/kivy/uix/layout.py", line 85, in add_widget size=self._trigger_layout, AttributeError: 'Layer' object has no attribute '_trigger_layout'

关于如何解决这个问题有什么想法吗？感兴趣的点是显示

的行

self.add_widget(Image(current_texture))

这是我的完整程序。

import xml.etree.ElementTree as ET
from kivy.uix.gridlayout import GridLayout
from kivy.graphics.texture import Texture
from kivy.core.image import Image
from kivy.core.window import Window

tree = ET.parse('test_tileset.tmx')
root = tree.getroot()


#import general elements from <map> tag
mapWidth = int(root.attrib['width'])
mapHeight = int(root.attrib['height'])
tileWidth = int(root.attrib['tilewidth'])
tileHeight = int(root.attrib['tileheight'])


class TileSet(object):
    """Stores data about tilesets to be accessed by tiles from that tileset"""

    def __init__(self, imagePath, imageWidth, imageHeight,    #creating instance attributes of the class,
                 tilesetFirstGid, tilesetTileWidth, tilesetTileHeight): #change values with each instance
        self.imagePath = imagePath
        self.imageWidth = imageWidth
        self.imageHeight = imageHeight
        self.tilesetFirstGid = tilesetFirstGid
        self.tilesetTileWidth = tilesetTileWidth
        self.tilesetTileHeight = tilesetTileHeight
        self.tilesetLastGid = (imageHeight//tilesetTileHeight)*(imageWidth//tilesetTileWidth)


#make a list of all the tilesets
tilesetList = []

#import data for each tileset from each <tileset> tag
Test = TileSet(root[0][0].attrib['source'], int(root[0][0].attrib['width']),
               int(root[0][0].attrib['height']), int(root[0].attrib['firstgid']),
               int(root[0].attrib['tilewidth']), int(root[0].attrib['tileheight'])
               )
tilesetList.append(Test)



def get_tileset(gid):
    """takes an integer, the gid. Returns an instance of the tileset that has that gid"""

    for i in tilesetList:
        if gid <= i.tilesetLastGid:
            return i



class Layer(GridLayout):
    """creates a grid of tiles based on information from a layer."""

    def __init__(self, name, width, height, **kwargs):
        self.name = str(name)
        self.width = width
        self.height = height

        #set the number of columns of the gridlayout
        self.cols = width

        #get the layer for ease of iteration below
        #using XPath to find all 'data' nodes that are children of nodes
        #with the name of the instance of the class
        self.layer = root.find(".//*[@name='"+self.name+"']/data")


        prevgid = 1
        current_texture = Image(Test.imagePath).texture
        current_texture = current_texture.get_region(0, 0, 32, 32)
        for gid in self.layer:
            gid = int(gid.attrib['gid'])
            if gid > 0:
                if gid != prevgid:
                    ts = get_tileset(gid)
                    current_texture = Image(ts.imagePath).texture
                    #getting a region of the texture based off the Global ID (GID)
                    current_texture = current_texture.get_region((ts.imageWidth//ts.tilesetTileWidth-1)*ts.tilesetTileWidth,
                                                                     (ts.imageHeight//ts.tilesetTileHeight-1)*ts.tilesetTileHeight,
                                                                     ts.tilesetTileWidth, ts.tilesetTileHeight)
                    prevgid = gid

                self.add_widget(Image(current_texture)) #returns an error. What am I doing wrong? 
                                                        #Is there a better way to add the texture to the GridLayout?
            else:
                self.add_widget() #something will go here once I figure out my main problem



Ground = Layer(root[1].attrib['name'], int(root[1].attrib['width']), int(root[1].attrib['height']))



if __name__ == '__main__':
    Ground().run()

Answer 1

您需要在 __init__ 方法中调用 super 构造函数

def __init__(self, name, width, height, **kwargs):
    GridLayout.__init__(self, cols=2, row_force_default=True, row_default_height=40, spacing=[0, 1],**kwargs)
    self.name = str(name)
    self.width = width
    self.height = height