我如何能够在kivy中检测孩子小部件中的触摸时间

Question

我如何检测游戏网格的儿童小部件中的触摸位置？当我想要调用子方法mark_label（）时。谢谢。

class GameGrid(GridLayout):

    def on_touch_move(self, touch):
        #wich label is collision  
        print(str(touch.pos))


class StartScreen(Screen):

    level = Level(mode, 1)

    def __init__(self,**kwargs):
        super().__init__(**kwargs)
        self.create_level()

    def create_level(self):
        self.ids.game_grid.clear_widgets()

        labels = self.level.get_letters_label()
        for f in range(len(labels)):
            self.ids.game_grid.add_widget(labels[f])

Answer 1

使用self.collide_points()方法检查触摸与感兴趣的小部件的碰撞。

片段

类CreateLabel（Label）：

def on_touch_down(self, touch):
    if self.collide_point(*touch.pos):
        # TODO
        # call method mark_label()
        if touch.button == "right":
            print("Right mouse clicked on {}".format(self.text))
        elif touch.button == "left":
            print("Left mouse clicked on {}".format(self.text))
        else:
            print(self.id)
        return True
    return super(CreateLabel, self).on_touch_down(touch)

Programming Guide » Events and Properties » Dispatching a Property event

  

如果触摸属于我们的小部件内部，我们会更改其值   按下touch.pos并返回True，表示我们已经消耗掉了   触摸，不希望它进一步传播。
...
最后，   如果触摸落在我们的小部件之外，我们称之为原始事件   使用super（...）并返回结果。这允许触摸事件   正常情况下继续传播。

实施例

main.py

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label


class CreateLabel(Label):

    def on_touch_down(self, touch):
        if self.collide_point(*touch.pos):
            if touch.button == "right":
                print("Right mouse clicked on {}".format(self.text))
            elif touch.button == "left":
                print("Left mouse clicked on {}".format(self.text))
            else:
                print(self.id)
            return True
        return super(CreateLabel, self).on_touch_down(touch)


class RootWidget(GridLayout):

    def __init__(self, **kwargs):
        super(RootWidget, self).__init__(**kwargs)
        self.build_board()

    def build_board(self):
        # make 9 label in a grid
        for i in range(0, 9):
            label = CreateLabel(id=str(i), text="Label {}".format(i))
            self.add_widget(label)


class TestApp(App):

    def build(self):
        return RootWidget()


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

test.kv

#:kivy 1.10.0

<CreateLabel>:
    canvas.before:
        Color:
            rgba: 0, 1, 1, 0.5  # 50% blue
        Rectangle:
            size: self.size
            pos: self.pos
    font_size: 30
    on_touch_down: self.on_touch_down

<RootWidget>:
    rows: 3
    cols: 3
    row_force_default: True
    row_default_height: 150
    col_force_default: True
    col_default_width: 150
    padding: [10]
    spacing: [10]

输出